Import v6.12.4 of the Inform 6 standard library

[informlib.git] / parser.h

! ==============================================================================
!   PARSER:  Front end to parser.
!
!   Supplied for use with Inform 6 -- Release 6.12.4 -- Serial number 200718
!
!   Copyright Graham Nelson 1993-2004 and David Griffith 2012-2020
!
!   This file is free software: you can redistribute it and/or modify
!   it under the terms of the GNU Affero General Public License as
!   published by the Free Software Foundation, either version 3 of the
!   License, or (at your option) any later version.
!
!   This file is distributed in the hope that it will be useful, but
!   WITHOUT ANY WARRANTY; without even the implied warranty of
!   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
!   Affero General Public License for more details.
!
!   In your game file, Include three library files in this order:
!       Include "parser";
!       Include "berblib";
!       Include "grammar";
!
! ------------------------------------------------------------------------------
!   Inclusion of "linklpa" (which defines properties and attributes)
!   Global variables, constants and arrays
!       1: outside of the parser
!       2: used within the parser
!   Inclusion of natural language definition file
!       (which creates a compass and direction-objects)
!   Darkness and player objects
!   Definition of grammar token numbering system used by Inform
!
!   The InformParser object
!       keyboard reading
!       level 0: outer shell, conversation, errors
!             1: grammar lines
!             2: tokens
!             3: object lists
!             4: scope and ambiguity resolving
!             5: object comparisons
!             6: word comparisons
!             7: reading words and moving tables about
!       pronoun management
!
!   The InformLibrary object
!       main game loop
!       action processing
!       end of turn sequence
!       scope looping, before/after sequence, sending messages out
!       timers, daemons, time of day, score notification
!       light and darkness
!       changing player personality
!       tracing code (only present if DEBUG is set)
!
!   Status line printing, menu display
!   Printing object names with articles
!   Miscellaneous utility routines
!   Game banner, "version" verb, run-time errors
! ==============================================================================

System_file;

#Ifndef LIBRARY_STAGE;  ! This file is the first one to define LIBRARY_STAGE.
                ! "This file already included" <=> "LIBRARY_STAGE exists"

! ------------------------------------------------------------------------------

#Ifndef VN_1633;
Message fatalerror "*** Library 6.12.3 needs Inform v6.33 or later to work ***";
#Endif; ! VN_

Include "version";

Constant BEFORE_PARSER   10;
Constant AFTER_PARSER    20;
Constant AFTER_VERBLIB   30;
Constant AFTER_GRAMMAR   40;

Constant LIBRARY_STAGE = BEFORE_PARSER;

Default COMMENT_CHARACTER '*';

#Ifdef INFIX;
Default DEBUG 0;
#Endif; ! INFIX

#Ifndef WORDSIZE;                   ! compiling with Z-code only compiler
Default TARGET_ZCODE 0;
Constant WORDSIZE 2;
#Endif; ! WORDSIZE

#Ifdef TARGET_ZCODE;                ! offsets into Z-machine header

Constant HDR_ZCODEVERSION  $00;     ! byte
Constant HDR_TERPFLAGS     $01;     ! byte
Constant HDR_GAMERELEASE   $02;     ! word
Constant HDR_HIGHMEMORY    $04;     ! word
Constant HDR_INITIALPC     $06;     ! word
Constant HDR_DICTIONARY    $08;     ! word
Constant HDR_OBJECTS       $0A;     ! word
Constant HDR_GLOBALS       $0C;     ! word
Constant HDR_STATICMEMORY  $0E;     ! word
Constant HDR_GAMEFLAGS     $10;     ! word
Constant HDR_GAMESERIAL    $12;     ! six ASCII characters
Constant HDR_ABBREVIATIONS $18;     ! word
Constant HDR_FILELENGTH    $1A;     ! word
Constant HDR_CHECKSUM      $1C;     ! word
Constant HDR_TERPNUMBER    $1E;     ! byte
Constant HDR_TERPVERSION   $1F;     ! byte
Constant HDR_SCREENHLINES  $20;     ! byte
Constant HDR_SCREENWCHARS  $21;     ! byte
Constant HDR_SCREENWUNITS  $22;     ! word
Constant HDR_SCREENHUNITS  $24;     ! word
Constant HDR_FONTWUNITS    $26;     ! byte
Constant HDR_FONTHUNITS    $27;     ! byte
Constant HDR_ROUTINEOFFSET $28;     ! word
Constant HDR_STRINGOFFSET  $2A;     ! word
Constant HDR_BGCOLOUR      $2C;     ! byte
Constant HDR_FGCOLOUR      $2D;     ! byte
Constant HDR_TERMCHARS     $2E;     ! word
Constant HDR_PIXELSTO3     $30;     ! word
Constant HDR_TERPSTANDARD  $32;     ! two bytes
Constant HDR_ALPHABET      $34;     ! word
Constant HDR_EXTENSION     $36;     ! word
Constant HDR_UNUSED        $38;     ! two words
Constant HDR_INFORMVERSION $3C;     ! four ASCII characters

#Ifnot; ! TARGET_GLULX              ! offsets into Glulx header and start of ROM

Constant HDR_MAGICNUMBER   $00;     ! long word
Constant HDR_GLULXVERSION  $04;     ! long word
Constant HDR_RAMSTART      $08;     ! long word
Constant HDR_EXTSTART      $0C;     ! long word
Constant HDR_ENDMEM        $10;     ! long word
Constant HDR_STACKSIZE     $14;     ! long word
Constant HDR_STARTFUNC     $18;     ! long word
Constant HDR_DECODINGTBL   $1C;     ! long word
Constant HDR_CHECKSUM      $20;     ! long word
Constant ROM_INFO          $24;     ! four ASCII characters
Constant ROM_MEMORYLAYOUT  $28;     ! long word
Constant ROM_INFORMVERSION $2C;     ! four ASCII characters
Constant ROM_COMPVERSION   $30;     ! four ASCII characters
Constant ROM_GAMERELEASE   $34;     ! short word
Constant ROM_GAMESERIAL    $36;     ! six ASCII characters

Include "infglk";

#Endif; ! TARGET_

Include "linklpa";

Fake_Action LetGo;
Fake_Action Receive;
Fake_Action ThrownAt;
Fake_Action Order;
Fake_Action TheSame;
Fake_Action PluralFound;
Fake_Action ListMiscellany;
Fake_Action Miscellany;
Fake_Action RunTimeError;
Fake_Action Prompt;
Fake_Action NotUnderstood;
Fake_Action Going;

#Ifdef NO_PLACES;
Fake_Action Places;
Fake_Action Objects;
#Endif; ! NO_PLACES

! ------------------------------------------------------------------------------

[ Main; InformLibrary.play(); ];

! ------------------------------------------------------------------------------

#Ifdef COLOR;
Constant COLOUR;
#Endif;

#Ifdef COLOUR;
Global clr_on = 1;
#Ifnot;
Global clr_on = 0;
#Endif;

! ------------------------------------------------------------------------------
!   Global variables and their associated Constant and Array declarations
! ------------------------------------------------------------------------------

Global location = InformLibrary;    ! Must be first global defined
Global sline1;                      ! Must be second
Global sline2;                      ! Must be third
                                    ! (for status line display)

! ------------------------------------------------------------------------------
!   Z-Machine and interpreter issues
! ------------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;
Global top_object;                  ! Largest valid number of any tree object
! ### these globals are not meaningful... well, maybe standard_interpreter,
! but I'll decide that later (AP).
Constant INDIV_PROP_START 64;       ! Equivalent of a Glulx constant

#Endif; ! TARGET_ZCODE

Global standard_interpreter;        ! The version number of the Z-Machine Standard which the
                                    ! interpreter claims to support, in form (upper byte).(lower)

Global undo_flag;                   ! Can the interpreter provide "undo"?
Global just_undone;                 ! Can't have two successive UNDOs

Global transcript_mode;             ! true when game scripting is on

#Ifdef TARGET_ZCODE;
Global xcommsdir;                   ! true if command recording is on
#Endif; ! TARGET_ZCODE

#Ifdef TARGET_GLULX;
Constant GG_MAINWIN_ROCK     201;
Constant GG_STATUSWIN_ROCK   202;
Constant GG_QUOTEWIN_ROCK    203;
Constant GG_SAVESTR_ROCK     301;
Constant GG_SCRIPTSTR_ROCK   302;
Constant GG_COMMANDWSTR_ROCK 303;
Constant GG_COMMANDRSTR_ROCK 304;
Constant GG_SCRIPTFREF_ROCK  401;
Array gg_event --> 4;
#Ifdef VN_1630;
Array gg_arguments buffer 28;
#Ifnot;
Array gg_arguments --> 8;
#Endif; ! VN_
Global gg_mainwin = 0;
Global gg_statuswin = 0;
Global gg_quotewin = 0;
Global gg_scriptfref = 0;
Global gg_scriptstr = 0;
Global gg_savestr = 0;
Global gg_commandstr = 0;
Global gg_command_reading = 0;      ! true if gg_commandstr is being replayed
#Endif; ! TARGET_GLULX

Global gg_statuswin_cursize = 0;
Global gg_statuswin_size = 1;

! ------------------------------------------------------------------------------
!   Time and score
!   (for linkage reasons, the task_* arrays are created not here but in verblib.h)
! ------------------------------------------------------------------------------

#Ifndef sys_statusline_flag;
Global sys_statusline_flag = 0;     ! non-zero if status line displays time
#Endif;

#Ifndef START_MOVE;
Constant START_MOVE 0;               ! Traditionally 0 for Infocom, 1 for Inform
#Endif;

Global turns = START_MOVE;          ! Number of turns of play so far
Global the_time = NULL;             ! Current time (in minutes since midnight)
Global time_rate = 1;               ! How often time is updated
Global time_step;                   ! By how much

#Ifndef MAX_TIMERS;
Constant MAX_TIMERS  32;            ! Max number timers/daemons active at once
#Endif; ! MAX_TIMERS
Array  the_timers  --> MAX_TIMERS;
Global active_timers;               ! Number of timers/daemons actives

Global score;                       ! The current score
Global last_score;                  ! Score last turn (for testing for changes)
Global notify_mode = true;          ! Score notification
Global places_score;                ! Contribution to score made by visiting
Global things_score;                ! Contribution made by acquisition

! ------------------------------------------------------------------------------
!   The player
! ------------------------------------------------------------------------------

Global player;                      ! Which object the human is playing through
Global deadflag;                    ! Normally 0, or false; 1 for dead
                                    ! 2 for victorious, and higher numbers
                                    ! represent exotic forms of death

! ------------------------------------------------------------------------------
!   Light and room descriptions
! ------------------------------------------------------------------------------

Global lightflag = true;            ! Is there currently light to see by?
Global real_location;               ! When in darkness, location = thedark
                                    ! and this holds the real location
Global prev_location;               ! The previous value of real_location
Global visibility_ceiling;          ! Highest object in tree visible from the
                                    ! player's point of view (usually the room,
                                    ! sometimes darkness, sometimes a closed
                                    ! non-transparent container).

Global lookmode = 2;                ! 1=brief, 2=verbose, 3=superbrief
                                    ! room descriptions
Global print_player_flag;           ! If set, print something like "(as Fred)"
                                    ! in room descriptions, to reveal whom the
                                    ! player is playing through
Global lastdesc;                    ! Value of location at time of most recent
                                    ! room description printed out

! ------------------------------------------------------------------------------
!   List writing  (style bits are defined as Constants in "verblibm.h")
! ------------------------------------------------------------------------------

Global c_style;                     ! Current list-writer style
Global lt_value;                    ! Common value of list_together
Global listing_together;            ! Object number of one member of a group
                                    ! being listed together
Global listing_size;                ! Size of such a group
Global wlf_indent;                  ! Current level of indentation printed by
                                    ! WriteListFrom()

Global inventory_stage = 1;         ! 1 or 2 according to the context in which
                                    ! "invent" routines of objects are called
Global inventory_style;             ! List-writer style currently used while
                                    ! printing inventories

Global objects_style;               ! List-writer style currently used while
Global places_style;                ! printing objects handled or places visited

! ------------------------------------------------------------------------------
!   Menus and printing
! ------------------------------------------------------------------------------

Global pretty_flag = true;          ! Use character graphics, or plain text?
Global menu_nesting;                ! Level of nesting (0 = root menu)
Global menu_item;                   ! These are used in communicating
Global item_width = 8;              ! with the menu-creating routines
Global item_name = "---";

Global lm_n;                        ! Parameters used by LibraryMessages
Global lm_o;                        ! mechanism
Global lm_s;

#Ifdef DEBUG;
Constant DEBUG_MESSAGES $0001;
Constant DEBUG_ACTIONS  $0002;
Constant DEBUG_TIMERS   $0004;
Constant DEBUG_CHANGES  $0008;
Constant DEBUG_VERBOSE  $0080;
Global debug_flag;                  ! Bitmap of flags for tracing actions,
                                    ! calls to object routines, etc.
Global x_scope_count;               ! Used in printing a list of everything
#Endif; ! DEBUG                     ! in scope

! five for colour control
! see http://www.inform-fiction.org/patches/L61007.html
! To enable colour define a constant or Global: COLOR or COLOUR
!Global clr_on;                      ! has colour been enabled by the player?
#Ifdef COLOUR;
Global clr_fg = 1;                  ! foreground colour
Global clr_bg = 1;                  ! background colour
Global clr_fgstatus = 1;            ! foreground colour of statusline
Global clr_bgstatus = 1;            ! background colour of statusline
#Endif; ! COLOUR
Global statuswin_current;           ! if writing to top window

Constant CLR_CURRENT 0;
Constant CLR_DEFAULT 1;
Constant CLR_BLACK   2;
Constant CLR_RED     3;
Constant CLR_GREEN   4;
Constant CLR_YELLOW  5;
Constant CLR_BLUE    6;
Constant CLR_MAGENTA 7;
Constant CLR_CYAN    8;
Constant CLR_WHITE   9;
Constant CLR_PURPLE  7;
Constant CLR_AZURE   8;

#Ifdef TARGET_GLULX;
Array GlulxColourValues
    --> (-2)
        (-1)
        $000000
        $EF0000
        $00D600
        $EFEF00
        $006BB5
        $FF00FF
        $00EFEF
        $FFFFFF;
#Endif; ! TARGET_GLULX

Constant WIN_ALL     0;
Constant WIN_STATUS  1;
Constant WIN_MAIN    2;

! ------------------------------------------------------------------------------
!   Action processing
! ------------------------------------------------------------------------------

Global action;                      ! Action currently being asked to perform
Global inp1;                        ! 0 (nothing), 1 (number) or first noun
Global inp2;                        ! 0 (nothing), 1 (number) or second noun
Global noun;                        ! First noun or numerical value
Global second;                      ! Second noun or numerical value

Global keep_silent;                 ! If true, attempt to perform the action
                                    ! silently (e.g. for implicit takes,
                                    ! implicit opening of unlocked doors)

Global reason_code;                 ! Reason for calling a "life" rule
                                    ! (an action or fake such as ##Kiss)

Global receive_action;              ! Either ##PutOn or ##Insert, whichever is
                                    ! action being tried when an object's
                                    ! "before" rule is checking "Receive"

Global no_implicit_actions;         ! Don't implicitly do things.

! ==============================================================================
!   Parser variables: first, for communication to the parser
! ------------------------------------------------------------------------------

Global parser_trace = 0;            ! Set this to 1 to make the parser trace
                                    ! tokens and lines
Global parser_action;               ! For the use of the parser when calling
Global parser_one;                  ! user-supplied routines
Global parser_two;                  !
Array  inputobjs       --> 16;      ! For parser to write its results in
Global parser_inflection;           ! A property (usually "name") to find
                                    ! object names in
Global parser_inflection_func;      ! Programmer sets this to true when
                                    ! parser_infection is a function

! ------------------------------------------------------------------------------
!   Parser output
! ------------------------------------------------------------------------------

Global actor;                       ! Person asked to do something
Global actors_location;             ! Like location, but for the actor
Global meta;                        ! Verb is a meta-command (such as "save")

#Ifdef INFIX;
Global infix_verb;                  ! Verb is an Infix command
#Endif;

Array  multiple_object --> 64;      ! List of multiple parameters
Global multiflag;                   ! Multiple-object flag passed to actions
                                    ! Also used to prevent misleading MULTI_PE
Global toomany_flag;                ! Flag for "multiple match too large"
                                    ! (e.g. if "take all" took over 100 things)

Global special_word;                ! Dictionary address for "special" token
Global special_number;              ! Number typed for "special" token
Global parsed_number;               ! For user-supplied parsing routines
Global consult_from;                ! Word that a "consult" topic starts on
Global consult_words;               ! ...and number of words in topic
Global asking_player;               ! True during disambiguation question

! ------------------------------------------------------------------------------
!   Implicit taking
! ------------------------------------------------------------------------------

Global notheld_mode;                ! To do with implicit taking
Global onotheld_mode;               !     "old copy of notheld_mode", ditto
Global not_holding;                 ! Object to be automatically taken as an
                                    ! implicit command
Array  kept_results --> 16;         ! Delayed command (while the take happens)

! ------------------------------------------------------------------------------
!   Error numbers when parsing a grammar line
! ------------------------------------------------------------------------------

Global etype;                       ! Error number on current line
Global best_etype;                  ! Preferred error number so far
Global nextbest_etype;              ! Preferred one, if ASKSCOPE_PE disallowed

Constant STUCK_PE     = 1;
Constant UPTO_PE      = 2;
Constant NUMBER_PE    = 3;
Constant CANTSEE_PE   = 4;
Constant TOOLIT_PE    = 5;
Constant NOTHELD_PE   = 6;
Constant MULTI_PE     = 7;
Constant MMULTI_PE    = 8;
Constant VAGUE_PE     = 9;
Constant EXCEPT_PE    = 10;
Constant ANIMA_PE     = 11;
Constant VERB_PE      = 12;
Constant SCENERY_PE   = 13;
Constant ITGONE_PE    = 14;
Constant JUNKAFTER_PE = 15;
Constant TOOFEW_PE    = 16;
Constant NOTHING_PE   = 17;
Constant ASKSCOPE_PE  = 18;

! ------------------------------------------------------------------------------
!   Pattern-matching against a single grammar line
! ------------------------------------------------------------------------------

Array pattern --> 32;               ! For the current pattern match
Global pcount;                      ! and a marker within it
Array pattern2 --> 32;              ! And another, which stores the best match
Global pcount2;                     ! so far
Constant PATTERN_NULL = $ffff;      ! Entry for a token producing no text

Array  line_ttype-->32;             ! For storing an analysed grammar line
Array  line_tdata-->32;
Array  line_token-->32;

Global parameters;                  ! Parameters (objects) entered so far
Global nsns;                        ! Number of special_numbers entered so far
Global special_number1;             ! First number, if one was typed
Global special_number2;             ! Second number, if two were typed

! ------------------------------------------------------------------------------
!   Inferences and looking ahead
! ------------------------------------------------------------------------------

Global params_wanted;               ! Number of parameters needed
                                    ! (which may change in parsing)

Global inferfrom;                   ! The point from which the rest of the
                                    ! command must be inferred
Global inferword;                   ! And the preposition inferred
Global dont_infer;                  ! Another dull flag
Global no_infer_message = false;    ! Use in ChooseObjects to suppress
                                    ! an inference message.

Global action_to_be;                ! (If the current line were accepted.)
Global action_reversed;             ! (Parameters would be reversed in order.)
Global advance_warning;             ! What a later-named thing will be

! ------------------------------------------------------------------------------
!   At the level of individual tokens now
! ------------------------------------------------------------------------------

Global found_ttype;                 ! Used to break up tokens into type
Global found_tdata;                 ! and data (by AnalyseToken)
Global token_filter;                ! For noun filtering by user routines

Global length_of_noun;              ! Set by NounDomain to no of words in noun

#Ifdef TARGET_ZCODE;
Constant REPARSE_CODE = 10000;      ! Signals "reparse the text" as a reply
                                    ! from NounDomain
#Ifnot; ! TARGET_GLULX
Constant REPARSE_CODE = $40000000;  ! The parser rather gunkily adds addresses
                                    ! to REPARSE_CODE for some purposes and
                                    ! expects the result to be greater than
                                    ! REPARSE_CODE (signed comparison).
                                    ! So Glulx Inform is limited to a single
                                    ! gigabyte of storage, for the moment.
#Endif; ! TARGET_

Global lookahead;                   ! The token after the one now being matched

Global multi_mode;                  ! Multiple mode
Global multi_wanted;                ! Number of things needed in multitude
Global multi_had;                   ! Number of things actually found
Global multi_context;               ! What token the multi-obj was accepted for

Global indef_mode;                  ! "Indefinite" mode - ie, "take a brick"
                                    ! is in this mode
Global indef_type;                  ! Bit-map holding types of specification
Global indef_wanted;                ! Number of items wanted (100 for all)
Global indef_guess_p;               ! Plural-guessing flag
Global indef_owner;                 ! Object which must hold these items
Global indef_cases;                 ! Possible gender and numbers of them
Global indef_possambig;             ! Has a possibly dangerous assumption
                                    ! been made about meaning of a descriptor?
Global indef_nspec_at;              ! Word at which a number like "two" was
                                    ! parsed (for backtracking)
Global allow_plurals;               ! Whether plurals presently allowed or not

Global take_all_rule;               ! Slightly different rules apply to
                                    ! "take all" than other uses of multiple
                                    ! objects, to make adjudication produce
                                    ! more pragmatically useful results
                                    ! (Not a flag: possible values 0, 1, 2)

Global dict_flags_of_noun;          ! Of the noun currently being parsed
                                    ! (a bitmap in #dict_par1 format)
Constant DICT_VERB $01;
Constant DICT_META $02;
Constant DICT_PLUR $04;
Constant DICT_PREP $08;
Constant DICT_X654 $70;
Constant DICT_NOUN $80;

Global pronoun_word;                ! Records which pronoun ("it", "them", ...)
                                    ! caused an error
Global pronoun_obj;                 ! And what obj it was thought to refer to
Global pronoun__word;               ! Saved value
Global pronoun__obj;                ! Saved value

! ------------------------------------------------------------------------------
!   Searching through scope and parsing "scope=Routine" grammar tokens
! ------------------------------------------------------------------------------

Constant PARSING_REASON       = 0;  ! Possible reasons for searching scope
Constant TALKING_REASON       = 1;
Constant EACH_TURN_REASON     = 2;
Constant REACT_BEFORE_REASON  = 3;
Constant REACT_AFTER_REASON   = 4;
Constant LOOPOVERSCOPE_REASON = 5;
Constant TESTSCOPE_REASON     = 6;

Global scope_reason = PARSING_REASON; ! Current reason for searching scope

Global scope_token;                 ! For "scope=Routine" grammar tokens
Global scope_error;
Global scope_stage;                 ! 1, 2 then 3

Global ats_flag = 0;                ! For AddToScope routines
Global ats_hls;                     !

Global placed_in_flag;              ! To do with PlaceInScope

! ------------------------------------------------------------------------------
!   The match list of candidate objects for a given token
! ------------------------------------------------------------------------------

Constant MATCH_LIST_SIZE = 64;
Array  match_list    --> MATCH_LIST_SIZE; ! An array of matched objects so far
Array  match_classes --> MATCH_LIST_SIZE; ! An array of equivalence classes for them
Array  match_scores --> MATCH_LIST_SIZE;  ! An array of match scores for them
Global number_matched;              ! How many items in it?  (0 means none)
Global number_of_classes;           ! How many equivalence classes?
Global match_length;                ! How many words long are these matches?
Global saved_ml;
Global match_from;                  ! At what word of the input do they begin?
Global bestguess_score;             ! What did the best-guess object score?

! ------------------------------------------------------------------------------
!   Low level textual manipulation
! ------------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

! 'buffer' holds the input line as typed by the player
!
!       buffer->0                     INPUT_BUFFER_LEN - WORDSIZE
!       buffer->1                     Number of characters input by player
!       buffer->2 ... buffer->121     The actual characters
!       buffer->122                   Spare byte to allow for 'terp bugs
!
! 'parse' holds the result of parsing that line into dictionary words
!
!       parse->0                      MAX_BUFFER_WORDS
!       parse->1                      Number of words input by player
!
!       parse-->1                     Dictionary addr of first input word
!       parse->4                      Number of characters in the word
!       parse->5                      Start position in 'buffer' of the word
!
!       parse-->3  parse->8,9         Same data for second input word
!       ...
!       parse-->29 parse->60,61       Same data for MAX_BUFFER_WORDS input word
!       parse->62,63,64               Spare bytes (not sure why)


Constant INPUT_BUFFER_LEN = WORDSIZE + 120;  ! 120 is limit on input chars
Constant MAX_BUFFER_WORDS = 15;              ! Limit on input words

Array  buffer  -> INPUT_BUFFER_LEN + 1;      ! For main line of input
Array  buffer2 -> INPUT_BUFFER_LEN + 1;      ! For supplementary questions
Array  buffer3 -> INPUT_BUFFER_LEN + 1;      ! Retaining input for "AGAIN"

#Ifdef VN_1630;
Array  parse   buffer (MAX_BUFFER_WORDS * 4) + 3;   ! Parsed data from 'buffer'
Array  parse2  buffer (MAX_BUFFER_WORDS * 4) + 3;   ! Parsed data from 'buffer2'
#Ifnot;
Array  parse   -> 2 + (MAX_BUFFER_WORDS * 4) + 3;
Array  parse2  -> 2 + (MAX_BUFFER_WORDS * 4) + 3;
#Endif; ! VN_

#Ifnot; ! TARGET_GLULX

! 'buffer' holds the input line as typed by the player
!
!       buffer-->0                    Number of characters input by player
!       buffer->4 ... buffer->259     The actual characters
!
! 'parse' holds the result of parsing that line into dictionary words
!
!       parse-->0                     Number of words input by player
!
!       parse-->1                     Dictionary addr of first input word
!       parse-->2                     Number of characters in the word
!       parse-->3                     Start position in 'buffer' of the word
!
!       parse-->4,5,6                 Same data for second input word
!       ...
!       parse-->58,59,60              Same data for MAX_BUFFER_WORDS input word

Constant INPUT_BUFFER_LEN = WORDSIZE + 256;    ! 256 is limit on input chars
Constant MAX_BUFFER_WORDS = 20;                ! Limit on input words

#Ifdef VN_1630;
Array  buffer  buffer (INPUT_BUFFER_LEN-WORDSIZE);  ! For main line of input
Array  buffer2 buffer (INPUT_BUFFER_LEN-WORDSIZE);  ! For supplementary questions
Array  buffer3 buffer (INPUT_BUFFER_LEN-WORDSIZE);  ! Retaining input for "AGAIN"
#Ifnot;
Array  buffer  -> INPUT_BUFFER_LEN;
Array  buffer2 -> INPUT_BUFFER_LEN;
Array  buffer3 -> INPUT_BUFFER_LEN;
#Endif; ! VN_
Array  parse   --> 1 + (MAX_BUFFER_WORDS * 3);      ! Parsed data from 'buffer'
Array  parse2  --> 1 + (MAX_BUFFER_WORDS * 3);      ! Parsed data from 'buffer2'

#Endif; ! TARGET_

Constant comma_word = 'comma,';     ! An "untypeable word" used to substitute
                                    ! for commas in parse buffers

Global wn;                          ! Word number within "parse" (from 1)
Global num_words;                   ! Number of words typed
Global num_desc;                    ! Number of descriptors typed
Global verb_word;                   ! Verb word (eg, take in "take all" or
                                    ! "dwarf, take all") - address in dict
Global verb_wordnum;                ! its number in typing order (eg, 1 or 3)
Global usual_grammar_after;         ! Point from which usual grammar is parsed (it may vary from the
                                    ! above if user's routines match multi-word verbs)

Global oops_from;                   ! The "first mistake" word number
Global saved_oops;                  ! Used in working this out

Constant OOPS_WORKSPACE_LEN 64;     ! Used temporarily by "oops" routine
Array  oops_workspace -> OOPS_WORKSPACE_LEN;

Global held_back_mode;              ! Flag: is there some input from last time
Global hb_wn;                       ! left over?  (And a save value for wn.)
                                    ! (Used for full stops and "then".)

Global caps_mode;                   ! Keep track of (The) with 'proper' caps
Global print_anything_result;       ! Return value from a PrintAny() routine
Global initial_lookmode;            ! Default, or set in Initialise()
Global before_first_turn;           ! True until after initial LOOK

! ----------------------------------------------------------------------------

Array PowersOfTwo_TB                ! Used in converting case numbers to case
  --> $$100000000000                ! bitmaps
      $$010000000000
      $$001000000000
      $$000100000000
      $$000010000000
      $$000001000000
      $$000000100000
      $$000000010000
      $$000000001000
      $$000000000100
      $$000000000010
      $$000000000001;

! ============================================================================
!  Constants, and one variable, needed for the language definition file
! ----------------------------------------------------------------------------

Constant POSSESS_PK  = $100;
Constant DEFART_PK   = $101;
Constant INDEFART_PK = $102;
Global short_name_case;

Global dict_start;
Global dict_entry_size;
Global dict_end;

! ----------------------------------------------------------------------------

Include "language__";               ! The natural language definition, whose filename is taken from
                                    ! the ICL language_name variable

! ----------------------------------------------------------------------------

#Ifndef LanguageCases;
Constant LanguageCases = 1;
#Endif; ! LanguageCases

! ------------------------------------------------------------------------------
!   Pronouns support for the cruder (library 6/2 and earlier) version:
!   only needed in English
! ------------------------------------------------------------------------------

#Ifdef EnglishNaturalLanguage;
Global itobj = NULL;                ! The object which is currently "it"
Global himobj = NULL;               ! The object which is currently "him"
Global herobj = NULL;               ! The object which is currently "her"

Global old_itobj = NULL;            ! The object which is currently "it"
Global old_himobj = NULL;           ! The object which is currently "him"
Global old_herobj = NULL;           ! The object which is currently "her"
#Endif; ! EnglishNaturalLanguage

! ============================================================================
! For present and past tenses
! ----------------------------------------------------------------------------
Constant PRESENT_TENSE 0;
Constant PAST_TENSE    1;

! ============================================================================
! For InformLibrary.actor_act() to control what happens when it aborts.
! ----------------------------------------------------------------------------
Constant ACTOR_ACT_OK 0;
Constant ACTOR_ACT_ABORT_NOTUNDERSTOOD 1;
Constant ACTOR_ACT_ABORT_ORDER 2;

! ============================================================================
! "Darkness" is not really a place: but it has to be an object so that the
!  location-name on the status line can be "Darkness".
! ----------------------------------------------------------------------------

Object  thedark "(darkness object)"
  with  initial 0,
        short_name DARKNESS__TX,
        description [;  return L__M(##Miscellany, 17); ];

! If you want to use the third-person of the narrative voice, you will
! need to replace this selfobj with your own.
Class  SelfClass
  with name ',a' ',b' ',c' ',d' ',e',
        short_name  YOURSELF__TX,
        description [;  return L__M(##Miscellany, 19); ],
        before NULL,
        after NULL,
        life NULL,
        each_turn NULL,
        time_out NULL,
        describe NULL,
        article THE__TX,
        add_to_scope 0,
        capacity 100,
        parse_name 0,
        orders 0,
        number 0,
        narrative_voice 2,
        narrative_tense PRESENT_TENSE,
        nameless true,
        posture 0,
        before_implicit [;Take: return 2;],
  has   concealed animate proper transparent;

SelfClass selfobj "(self object)";

! ============================================================================
!  The definition of the token-numbering system used by Inform.
! ----------------------------------------------------------------------------

Constant ILLEGAL_TT         = 0;    ! Types of grammar token: illegal
Constant ELEMENTARY_TT      = 1;    !     (one of those below)
Constant PREPOSITION_TT     = 2;    !     e.g. 'into'
Constant ROUTINE_FILTER_TT  = 3;    !     e.g. noun=CagedCreature
Constant ATTR_FILTER_TT     = 4;    !     e.g. edible
Constant SCOPE_TT           = 5;    !     e.g. scope=Spells
Constant GPR_TT             = 6;    !     a general parsing routine

Constant NOUN_TOKEN         = 0;    ! The elementary grammar tokens, and
Constant HELD_TOKEN         = 1;    ! the numbers compiled by Inform to
Constant MULTI_TOKEN        = 2;    ! encode them
Constant MULTIHELD_TOKEN    = 3;
Constant MULTIEXCEPT_TOKEN  = 4;
Constant MULTIINSIDE_TOKEN  = 5;
Constant CREATURE_TOKEN     = 6;
Constant SPECIAL_TOKEN      = 7;
Constant NUMBER_TOKEN       = 8;
Constant TOPIC_TOKEN        = 9;


Constant GPR_FAIL           = -1;   ! Return values from General Parsing
Constant GPR_PREPOSITION    = 0;    ! Routines
Constant GPR_NUMBER         = 1;
Constant GPR_MULTIPLE       = 2;
Constant GPR_REPARSE        = REPARSE_CODE;
Constant GPR_NOUN           = $ff00;
Constant GPR_HELD           = $ff01;
Constant GPR_MULTI          = $ff02;
Constant GPR_MULTIHELD      = $ff03;
Constant GPR_MULTIEXCEPT    = $ff04;
Constant GPR_MULTIINSIDE    = $ff05;
Constant GPR_CREATURE       = $ff06;

Constant ENDIT_TOKEN        = 15;   ! Value used to mean "end of grammar line"

#Iftrue (Grammar__Version == 1);

[ AnalyseToken token m;
    found_tdata = token;
    if (token < 0)   { found_ttype = ILLEGAL_TT; return; }
    if (token <= 8)  { found_ttype = ELEMENTARY_TT; return; }
    if (token < 15)  { found_ttype = ILLEGAL_TT; return; }
    if (token == 15) { found_ttype = ELEMENTARY_TT; return; }
    if (token < 48)  { found_ttype = ROUTINE_FILTER_TT;
                       found_tdata = token - 16;
                       return;
    }
    if (token < 80)  { found_ttype = GPR_TT;
                       found_tdata = #preactions_table-->(token-48);
                       return;
    }
    if (token < 128) { found_ttype = SCOPE_TT;
                       found_tdata = #preactions_table-->(token-80);
                       return;
    }
    if (token < 180) { found_ttype = ATTR_FILTER_TT;
                       found_tdata = token - 128;
                       return;
    }

    found_ttype = PREPOSITION_TT;
    m = #adjectives_table;
    for (::) {
        if (token == m-->1) { found_tdata = m-->0; return; }
        m = m+4;
    }
    m = #adjectives_table; RunTimeError(1);
    found_tdata = m;
];

[ UnpackGrammarLine line_address i m;
    for (i=0 : i<32 : i++) {
        line_token-->i = ENDIT_TOKEN;
        line_ttype-->i = ELEMENTARY_TT;
        line_tdata-->i = ENDIT_TOKEN;
    }
    for (i=0 : i<=5 : i++) {
        line_token-->i = line_address->(i+1);
        AnalyseToken(line_token-->i);
        if ((found_ttype == ELEMENTARY_TT) && (found_tdata == NOUN_TOKEN)
           && (m == line_address->0)) {
            line_token-->i = ENDIT_TOKEN;
            break;
        }
        line_ttype-->i = found_ttype;
        line_tdata-->i = found_tdata;
        if (found_ttype ~= PREPOSITION_TT) m++;
    }
    action_to_be = line_address->7;
    action_reversed = false;
    params_wanted = line_address->0;
    return line_address + 8;
];

#Ifnot; ! Grammar__Version == 2

[ AnalyseToken token;
    if (token == ENDIT_TOKEN) {
        found_ttype = ELEMENTARY_TT;
        found_tdata = ENDIT_TOKEN;
        return;
    }
    found_ttype = (token->0) & $$1111;
    found_tdata = (token+1)-->0;
];

#Ifdef TARGET_ZCODE;

[ UnpackGrammarLine line_address i;
    for (i=0 : i<32 : i++) {
        line_token-->i = ENDIT_TOKEN;
        line_ttype-->i = ELEMENTARY_TT;
        line_tdata-->i = ENDIT_TOKEN;
    }
    action_to_be = 256*(line_address->0) + line_address->1;
    action_reversed = ((action_to_be & $400) ~= 0);
    action_to_be = action_to_be & $3ff;
    line_address--;
    params_wanted = 0;
    for (i=0 : : i++) {
        line_address = line_address + 3;
        if (line_address->0 == ENDIT_TOKEN) break;
        line_token-->i = line_address;
        AnalyseToken(line_address);
        if (found_ttype ~= PREPOSITION_TT) params_wanted++;
        line_ttype-->i = found_ttype;
        line_tdata-->i = found_tdata;
    }
    return line_address + 1;
];

#Ifnot; ! TARGET_GLULX

[ UnpackGrammarLine line_address i;
    for (i=0 : i<32 : i++) {
        line_token-->i = ENDIT_TOKEN;
        line_ttype-->i = ELEMENTARY_TT;
        line_tdata-->i = ENDIT_TOKEN;
    }
    @aloads line_address 0 action_to_be;
    action_reversed = (((line_address->2) & 1) ~= 0);
    line_address = line_address - 2;
    params_wanted = 0;
    for (i=0 : : i++) {
        line_address = line_address + 5;
        if (line_address->0 == ENDIT_TOKEN) break;
        line_token-->i = line_address;
        AnalyseToken(line_address);
        if (found_ttype ~= PREPOSITION_TT) params_wanted++;
        line_ttype-->i = found_ttype;
        line_tdata-->i = found_tdata;
    }
    return line_address + 1;
];

#Endif; ! TARGET_
#Endif; ! Grammar__Version

! To protect against a bug in early versions of the "Zip" interpreter:
! Of course, in Glulx, this routine actually performs work.

#Ifdef TARGET_ZCODE;

[ Tokenise__ b p; b->(2 + b->1) = 0; @tokenise b p; ];

#Ifnot; ! TARGET_GLULX

Array gg_tokenbuf -> DICT_WORD_SIZE;

[ GGWordCompare str1 str2 ix jx;
    for (ix=0 : ix<DICT_WORD_SIZE : ix++) {
        jx = (str1->ix) - (str2->ix);
        if (jx ~= 0) return jx;
    }
    return 0;
];

[ Tokenise__ buf tab
    cx numwords len bx ix wx wpos wlen val res dictlen entrylen;
    len = buf-->0;
    buf = buf+WORDSIZE;

    ! First, split the buffer up into words. We use the standard Infocom
    ! list of word separators (comma, period, double-quote).

    cx = 0;
    numwords = 0;
    while (cx < len) {
        while (cx < len && buf->cx == ' ') cx++;
        if (cx >= len) break;
        bx = cx;
        if (buf->cx == '.' or ',' or '"') cx++;
        else {
            while (cx < len && buf->cx ~= ' ' or '.' or ',' or '"') cx++;
        }
        tab-->(numwords*3+2) = (cx-bx);
        tab-->(numwords*3+3) = WORDSIZE+bx;
        numwords++;
        if (numwords >= MAX_BUFFER_WORDS) break;
    }
    tab-->0 = numwords;

    ! Now we look each word up in the dictionary.

    dictlen = #dictionary_table-->0;
    entrylen = DICT_WORD_SIZE + 7;

    for (wx=0 : wx<numwords : wx++) {
        wlen = tab-->(wx*3+2);
        wpos = tab-->(wx*3+3);

        ! Copy the word into the gg_tokenbuf array, clipping to DICT_WORD_SIZE
        ! characters and lower case.
        if (wlen > DICT_WORD_SIZE) wlen = DICT_WORD_SIZE;
        cx = wpos - WORDSIZE;
        for (ix=0 : ix<wlen : ix++) gg_tokenbuf->ix = glk_char_to_lower(buf->(cx+ix));
        for (: ix<DICT_WORD_SIZE : ix++) gg_tokenbuf->ix = 0;

        val = #dictionary_table + WORDSIZE;
        @binarysearch gg_tokenbuf DICT_WORD_SIZE val entrylen dictlen 1 1 res;
        tab-->(wx*3+1) = res;
    }
];

#Endif; ! TARGET_

! ============================================================================
!   The InformParser object abstracts the front end of the parser.
!
!   InformParser.parse_input(results)
!   returns only when a sensible request has been made, and puts into the
!   "results" buffer:
!
!   --> 0 = The action number
!   --> 1 = Number of parameters
!   --> 2, 3, ... = The parameters (object numbers), but
!                   0 means "put the multiple object list here"
!                   1 means "put one of the special numbers here"
!
! ----------------------------------------------------------------------------

Object  InformParser "(Inform Parser)"
  with  parse_input [ results; Parser__parse(results); ],
  has   proper;

! ----------------------------------------------------------------------------
!   The Keyboard routine actually receives the player's words,
!   putting the words in "a_buffer" and their dictionary addresses in
!   "a_table".  It is assumed that the table is the same one on each
!   (standard) call.
!
!   It can also be used by miscellaneous routines in the game to ask
!   yes-no questions and the like, without invoking the rest of the parser.
!
!   Return the number of words typed
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ GetNthChar a_buffer n i;
    for (i = 0: a_buffer->(2+i) == ' ': i++) {
        if (i > a_buffer->(1)) return false;
    }
    return a_buffer->(2+i+n);
];

[ KeyboardPrimitive  a_buffer a_table;
    read a_buffer a_table;

    #Iftrue (#version_number == 6);
    @output_stream -1;
    @loadb a_buffer 1 -> sp;
    @add a_buffer 2 -> sp;
    @print_table sp sp;
    new_line;
    @output_stream 1;
    #Endif;
];

[ KeyCharPrimitive win  key;
    if (win) @set_window win;
    @read_char 1 -> key;
    return key;
];

[ KeyTimerInterrupt;
    rtrue;
];

[ KeyDelay tenths  key;
    @read_char 1 tenths KeyTimerInterrupt -> key;
    return key;
];

#Ifnot; ! TARGET_GLULX

[ GetNthChar a_buffer n i;
    for (i = 0: a_buffer->(4+i) == ' ': i++) {
        if (i > a_buffer->(1)) return false;
    }
    return a_buffer->(4+i+n);
];

[ KeyCharPrimitive win nostat done res ix jx ch;
    jx = ch; ! squash compiler warnings
    if (win == 0) win = gg_mainwin;
    if (gg_commandstr ~= 0 && gg_command_reading ~= false) {
        ! get_line_stream
        done = glk_get_line_stream(gg_commandstr, gg_arguments, 31);
        if (done == 0) {
            glk_stream_close(gg_commandstr, 0);
            gg_commandstr = 0;
            gg_command_reading = false;
            ! fall through to normal user input.
        }
        else {
            ! Trim the trailing newline
            if (gg_arguments->(done-1) == 10) done = done-1;
            res = gg_arguments->0;
            if (res == '\') {
                res = 0;
                for (ix=1 : ix<done : ix++) {
                    ch = gg_arguments->ix;
                    if (ch >= '0' && ch <= '9') {
                        @shiftl res 4 res;
                        res = res + (ch-'0');
                    }
                    else if (ch >= 'a' && ch <= 'f') {
                        @shiftl res 4 res;
                        res = res + (ch+10-'a');
                    }
                    else if (ch >= 'A' && ch <= 'F') {
                        @shiftl res 4 res;
                        res = res + (ch+10-'A');
                    }
                }
            }
        jump KCPContinue;
        }
    }
    done = false;
    glk_request_char_event(win);
    while (~~done) {
        glk_select(gg_event);
        switch (gg_event-->0) {
          5: ! evtype_Arrange
            if (nostat) {
                glk_cancel_char_event(win);
                res = $80000000;
                done = true;
                break;
            }
            DrawStatusLine();
          2: ! evtype_CharInput
            if (gg_event-->1 == win) {
                res = gg_event-->2;
                done = true;
                }
        }
        ix = HandleGlkEvent(gg_event, 1, gg_arguments);
        if (ix == 0) ix = LibraryExtensions.RunWhile(ext_handleglkevent, 0, gg_event, 1, gg_arguments);
        if (ix == 2) {
            res = gg_arguments-->0;
            done = true;
        }
        else if (ix == -1) {
            done = false;
        }
    }
    if (gg_commandstr ~= 0 && gg_command_reading == false) {
        if (res < 32 || res >= 256 || (res == '\' or ' ')) {
            glk_put_char_stream(gg_commandstr, '\');
            done = 0;
            jx = res;
            for (ix=0 : ix<8 : ix++) {
                @ushiftr jx 28 ch;
                @shiftl jx 4 jx;
                ch = ch & $0F;
                if (ch ~= 0 || ix == 7) done = 1;
                if (done) {
                    if (ch >= 0 && ch <= 9) ch = ch + '0';
                    else                    ch = (ch - 10) + 'A';
                    glk_put_char_stream(gg_commandstr, ch);
                }
            }
        }
        else {
            glk_put_char_stream(gg_commandstr, res);
        }
        glk_put_char_stream(gg_commandstr, 10);
    }
  .KCPContinue;
    return res;
];

[ KeyDelay tenths  key done ix;
    glk_request_char_event(gg_mainwin);
    glk_request_timer_events(tenths*100);
    while (~~done) {
        glk_select(gg_event);
        ix = HandleGlkEvent(gg_event, 1, gg_arguments);
        if (ix == 0) ix = LibraryExtensions.RunWhile(ext_handleglkevent, 0, gg_event, 1, gg_arguments);
        if (ix == 2) {
            key = gg_arguments-->0;
            done = true;
        }
        else if (ix >= 0 && gg_event-->0 == 1 or 2) {
            key = gg_event-->2;
            done = true;
        }
    }
    glk_cancel_char_event(gg_mainwin);
    glk_request_timer_events(0);
    return key;
];

[ KeyboardPrimitive  a_buffer a_table done ix;
    if (gg_commandstr ~= 0 && gg_command_reading ~= false) {
        ! get_line_stream
        done = glk_get_line_stream(gg_commandstr, a_buffer+WORDSIZE, (INPUT_BUFFER_LEN-WORDSIZE)-1);
        if (done == 0) {
            glk_stream_close(gg_commandstr, 0);
            gg_commandstr = 0;
            gg_command_reading = false;
            ! L__M(##CommandsRead, 5); would come after prompt
            ! fall through to normal user input.
        }
        else {
            ! Trim the trailing newline
            if ((a_buffer+WORDSIZE)->(done-1) == 10) done = done-1;
            a_buffer-->0 = done;
            glk_set_style(style_Input);
            glk_put_buffer(a_buffer+WORDSIZE, done);
            glk_set_style(style_Normal);
            print "^";
            jump KPContinue;
        }
    }
    done = false;
    glk_request_line_event(gg_mainwin, a_buffer+WORDSIZE, INPUT_BUFFER_LEN-WORDSIZE, 0);
    while (~~done) {
        glk_select(gg_event);
        switch (gg_event-->0) {
          5: ! evtype_Arrange
            DrawStatusLine();
          3: ! evtype_LineInput
            if (gg_event-->1 == gg_mainwin) {
                a_buffer-->0 = gg_event-->2;
                done = true;            }
        }
        ix = HandleGlkEvent(gg_event, 0, a_buffer);
        if (ix == 0) ix = LibraryExtensions.RunWhile(ext_handleglkevent, 0, gg_event, 0, a_buffer);
        if (ix == 2) done = true;
        else if (ix == -1) done = false;
    }
    if (gg_commandstr ~= 0 && gg_command_reading == false) {
        ! put_buffer_stream

        glk_put_buffer_stream(gg_commandstr, a_buffer+WORDSIZE, a_buffer-->0);
        glk_put_char_stream(gg_commandstr, 10);
    }
  .KPContinue;
    Tokenise__(a_buffer,a_table);
    ! It's time to close any quote window we've got going.
    if (gg_quotewin) {
        glk_window_close(gg_quotewin, 0);
        gg_quotewin = 0;
    }
];

#Endif; ! TARGET_

[ Keyboard  a_buffer a_table  nw i w w2 x1 x2;
    DisplayStatus();

  .FreshInput;

    ! Save the start of the buffer, in case "oops" needs to restore it
    ! to the previous time's buffer

    for (i=0 : i<OOPS_WORKSPACE_LEN : i++) oops_workspace->i = a_buffer->i;

    ! In case of an array entry corruption that shouldn't happen, but would be
    ! disastrous if it did:

    #Ifdef TARGET_ZCODE;
    a_buffer->0 = INPUT_BUFFER_LEN - WORDSIZE;
    a_table->0  = MAX_BUFFER_WORDS; ! Allow to split input into this many words
    #Endif; ! TARGET_

    ! Print the prompt, and read in the words and dictionary addresses

    L__M(##Prompt);
    if (AfterPrompt() == 0) LibraryExtensions.RunAll(ext_afterprompt);
    #IfV5;
    DrawStatusLine();
    #Endif; ! V5

    KeyboardPrimitive(a_buffer, a_table);
    nw = NumberWords(a_table);

    ! If the line was blank, get a fresh line
    if (nw == 0) {
        L__M(##Miscellany, 10);
        jump FreshInput;
    }

    ! Unless the opening word was "oops", return
    ! Conveniently, a_table-->1 is the first word in both ZCODE and GLULX.

    w = a_table-->1;
    if (w == OOPS1__WD or OOPS2__WD or OOPS3__WD) jump DoOops;

    if (a_buffer->WORDSIZE == COMMENT_CHARACTER) {
        #Ifdef TARGET_ZCODE;
        if ((HDR_GAMEFLAGS-->0) & $0001 || xcommsdir)
                                           L__M(##Miscellany, 54);
        else                               L__M(##Miscellany, 55);
        #Ifnot; ! TARGET_GLULX
        if (gg_scriptstr || gg_commandstr) L__M(##Miscellany, 54);
        else                               L__M(##Miscellany, 55);
        #Endif; ! TARGET_

        jump FreshInput;
    }

    #IfV5;
    ! Undo handling

    if ((w == UNDO1__WD or UNDO2__WD or UNDO3__WD) && (nw==1)) {
        i = PerformUndo();
        if (i == 0) jump FreshInput;
    }
    #Ifdef TARGET_ZCODE;
    @save_undo i;
    #Ifnot; ! TARGET_GLULX
    @saveundo i;
    if (i == -1) {
        GGRecoverObjects();
        i = 2;
    }
    else  i = (~~i);
    #Endif; ! TARGET_
    just_undone = 0;
    undo_flag = 2;
    if (i == -1) undo_flag = 0;
    if (i == 0) undo_flag = 1;
    if (i == 2) {
        RestoreColours();
        #Ifdef TARGET_ZCODE;
        style bold;
        #Ifnot; ! TARGET_GLULX
        glk_set_style(style_Subheader);
        #Endif; ! TARGET_
        print (name) location, "^";
        #Ifdef TARGET_ZCODE;
        style roman;
        #Ifnot; ! TARGET_GLULX
        glk_set_style(style_Normal);
        #Endif; ! TARGET_
        L__M(##Miscellany, 13);
        just_undone = 1;
        jump FreshInput;
    }
    #Endif; ! V5

    return nw;

  .DoOops;
    if (oops_from == 0) {
        L__M(##Miscellany, 14);
        jump FreshInput;
    }
    if (nw == 1) {
        L__M(##Miscellany, 15);
        jump FreshInput;
    }
    if (nw > 2) {
        L__M(##Miscellany, 16);
        jump FreshInput;
    }

    ! So now we know: there was a previous mistake, and the player has
    ! attempted to correct a single word of it.

    for (i=0 : i<INPUT_BUFFER_LEN : i++) buffer2->i = a_buffer->i;
    #Ifdef TARGET_ZCODE;
    x1 = a_table->9;  ! Start of word following "oops"
    x2 = a_table->8;  ! Length of word following "oops"
    #Ifnot; ! TARGET_GLULX
    x1 = a_table-->6; ! Start of word following "oops"
    x2 = a_table-->5; ! Length of word following "oops"
    #Endif; ! TARGET_

    ! Repair the buffer to the text that was in it before the "oops"
    ! was typed:

    for (i=0 : i < OOPS_WORKSPACE_LEN : i++) a_buffer->i = oops_workspace->i;
    Tokenise__(a_buffer, a_table);

    ! Work out the position in the buffer of the word to be corrected:

    #Ifdef TARGET_ZCODE;
    w = a_table->(4*oops_from + 1); ! Start of word to go
    w2 = a_table->(4*oops_from);    ! Length of word to go
    #Ifnot; ! TARGET_GLULX
    w = a_table-->(3*oops_from);      ! Start of word to go
    w2 = a_table-->(3*oops_from - 1); ! Length of word to go
    #Endif; ! TARGET_

#Ifdef OOPS_CHECK;
    print "[~";
    for (i=0 : i<w2 : i++) for (i=0 : i<w2 : i++) print (char)a_buffer->(i+w);
    print "~ --> ~";
#Endif;

    ! Write spaces over the word to be corrected:

    for (i=0 : i<w2 : i++) a_buffer->(i+w) = ' ';

    if (w2 < x2) {
        ! If the replacement is longer than the original, move up...
        for (i=INPUT_BUFFER_LEN-1 : i>=w+x2 : i--)
            a_buffer->i = a_buffer->(i-x2+w2);

        ! ...increasing buffer size accordingly.
        SetKeyBufLength(GetKeyBufLength(a_buffer) + (x2-w2), a_buffer);
    }

    ! Write the correction in:

    for (i=0 : i<x2 : i++) {
        a_buffer->(i+w) = buffer2->(i+x1);
#Ifdef OOPS_CHECK;
        print (char) buffer2->(i+x1);
#Endif;
    }

#Ifdef OOPS_CHECK;
        print "~]^^";
#Endif;

    Tokenise__(a_buffer, a_table);
    nw=NumberWords(a_table);

!    saved_ml = 0;
    return nw;
]; ! end of Keyboard

[ PerformUndo i;
    if (turns == START_MOVE) { L__M(##Miscellany, 11); return 0; }
    if (undo_flag == 0) {      L__M(##Miscellany, 6); return 0; }
    if (undo_flag == 1) {      L__M(##Miscellany, 7); return 0; }
    #Ifdef TARGET_ZCODE;
    @restore_undo i;
    #Ifnot; ! TARGET_GLULX
    @restoreundo i;
    i = (~~i);
    #Endif; ! TARGET_
    if (i == 0) {    L__M(##Miscellany, 7); return 0; }
    L__M(##Miscellany, 1);
    return 1;
];

! ==========================
! Taken from I7's Parser.i6t
! ==========================

[ DictionaryWordToVerbNum dword verbnum;
#Ifdef TARGET_ZCODE;
    verbnum = $ff-(dword->#dict_par2);
#Ifnot; ! GLULX
    dword = dword + #dict_par2 - 1;
    @aloads dword 0 verbnum;
    verbnum = $ffff-verbnum;
#Endif;
    return verbnum;
];

! ==========================


! ----------------------------------------------------------------------------
!   To simplify the picture a little, a rough map of the main routine:
!
!   (A) Get the input, do "oops" and "again"
!   (B) Is it a direction, and so an implicit "go"?  If so go to (K)
!   (C) Is anyone being addressed?
!   (D) Get the verb: try all the syntax lines for that verb
!   (E) Break down a syntax line into analysed tokens
!   (F) Look ahead for advance warning for multiexcept/multiinside
!   (G) Parse each token in turn (calling ParseToken to do most of the work)
!   (H) Cheaply parse otherwise unrecognised conversation and return
!   (I) Print best possible error message
!   (J) Retry the whole lot
!   (K) Last thing: check for "then" and further instructions(s), return.
!
!   The strategic points (A) to (K) are marked in the commentary.
!
!   Note that there are three different places where a return can happen.
! ----------------------------------------------------------------------------

[ Parser__parse  results   syntax line num_lines line_address i j k
                           token l m line_etype vw;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! A: Get the input, do "oops" and "again"
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! Firstly, in "not held" mode, we still have a command left over from last
    ! time (eg, the user typed "eat biscuit", which was parsed as "take biscuit"
    ! last time, with "eat biscuit" tucked away until now).  So we return that.

    if (notheld_mode == 1) {
        for (i=0 : i<8 : i++) results-->i = kept_results-->i;
        notheld_mode = 0;
        rtrue;
    }

    if (held_back_mode ~= 0) {
        held_back_mode = 0;
        Tokenise__(buffer, parse);
        jump ReParse;
    }

  .ReType;

    Keyboard(buffer, parse);

#Ifdef INFIX;
    ! An Infix verb is a special kind of meta verb.  We mark them here.
    if (GetNthChar(buffer, 0) == ';')
        infix_verb = true;
    else
        infix_verb = false;
#Endif;

  .ReParse;

    parser_inflection = name;
    parser_inflection_func = false;

    ! Initially assume the command is aimed at the player, and the verb
    ! is the first word

    num_words = NumberWords();
    wn = 1;

    #Ifdef LanguageToInformese;
    LanguageToInformese();
    #IfV5;
    ! Re-tokenise:
    Tokenise__(buffer,parse);
    #Endif; ! V5
    #Endif; ! LanguageToInformese

    if (BeforeParsing() == false) {
        LibraryExtensions.ext_number_1 = wn;    ! Set "between calls" functionality to restore wn each pass
        LibraryExtensions.BetweenCalls = LibraryExtensions.RestoreWN;
        LibraryExtensions.RunWhile(ext_beforeparsing, false);
        LibraryExtensions.BetweenCalls = 0;     ! Turn off "between calls" functionality
     }
    num_words = NumberWords();

    k=0;
    #Ifdef DEBUG;
    if (parser_trace >= 2) {
        print "[ ";
        for (i=0 : i<num_words : i++) {

            j = WordValue(i+1);
            k = WordAddress(i+1);
            l = WordLength(i+1);
            print "~"; for (m=0 : m<l : m++) print (char) k->m; print "~ ";

            if (j == 0) print "?";
            else {
                #Ifdef TARGET_ZCODE;
                if (UnsignedCompare(j, HDR_DICTIONARY-->0) >= 0 &&
                    UnsignedCompare(j, HDR_HIGHMEMORY-->0) < 0)
                     print (address) j;
                else print j;
                #Ifnot; ! TARGET_GLULX
                if (j->0 == $60) print (address) j;
                else print j;
                #Endif; ! TARGET_
            }
            if (i ~= num_words-1) print " / ";
        }
        print " ]^";
    }
    #Endif; ! DEBUG
    verb_wordnum = 1;
    actor = player;
    actors_location = ScopeCeiling(player);
    usual_grammar_after = 0;

  .AlmostReParse;

    scope_token = 0;
    action_to_be = NULL;

    ! Begin from what we currently think is the verb word

  .BeginCommand;

    wn = verb_wordnum;
    verb_word = NextWordStopped();

    ! If there's no input here, we must have something like "person,".

    if (verb_word == -1) {
        best_etype = STUCK_PE;
        jump GiveError;
    }

    ! Now try for "again" or "g", which are special cases: don't allow "again" if nothing
    ! has previously been typed; simply copy the previous text across

    if (verb_word == AGAIN2__WD or AGAIN3__WD) verb_word = AGAIN1__WD;
    if (verb_word == AGAIN1__WD) {
        if (actor ~= player) {
            L__M(##Miscellany, 20);
            jump ReType;
        }
        if (GetKeyBufLength(buffer3) == 0) {
            L__M(##Miscellany, 21);
            jump ReType;
        }

        if (WordAddress(verb_wordnum) == buffer + WORDSIZE) { ! not held back
            ! splice rest of buffer onto end of buffer3
            i = GetKeyBufLength(buffer3);
            while (buffer3 -> (i + WORDSIZE - 1) == ' ' or '.')
                i--;
            j = i - WordLength(verb_wordnum);  ! amount to move buffer up by
            if (j > 0) {
                for (m=INPUT_BUFFER_LEN-1 : m>=WORDSIZE+j : m--)
                    buffer->m = buffer->(m-j);
                SetKeyBufLength(GetKeyBufLength()+j);
                }
            for (m=WORDSIZE : m<WORDSIZE+i : m++) buffer->m = buffer3->m;
            if (j < 0) for (:m<WORDSIZE+i-j : m++) buffer->m = ' ';
         }
        else
            for (i=0 : i<INPUT_BUFFER_LEN : i++) buffer->i = buffer3->i;
        jump ReParse;
    }

    ! Save the present input in case of an "again" next time

    if (verb_word ~= AGAIN1__WD)
        for (i=0 : i<INPUT_BUFFER_LEN : i++) buffer3->i = buffer->i;

    if (usual_grammar_after == 0) {
        j = verb_wordnum;
        i = RunRoutines(actor, grammar);
        #Ifdef DEBUG;
        if (parser_trace >= 2 && actor.grammar ~= 0 or NULL)
            print " [Grammar property returned ", i, "]^";
        #Endif; ! DEBUG

        #Ifdef TARGET_ZCODE;
        if ((i ~= 0 or 1) &&
            (UnsignedCompare(i, dict_start) < 0 ||
             UnsignedCompare(i, dict_end) >= 0 ||
             (i - dict_start) % dict_entry_size ~= 0)) {
            usual_grammar_after = j;
            i=-i;
        }

        #Ifnot; ! TARGET_GLULX
        if (i < 0) { usual_grammar_after = j; i=-i; }
        #Endif;

        if (i == 1) {
            results-->0 = action;
            results-->1 = 0;            ! Number of parameters
            results-->2 = noun;
            results-->3 = second;
            if (noun) results-->1 = 1;
            if (second) results-->1 = 2;
            rtrue;
        }
        if (i ~= 0) { verb_word = i; wn--; verb_wordnum--; }
        else { wn = verb_wordnum; verb_word = NextWord(); }
    }
    else usual_grammar_after = 0;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! B: Is it a direction, and so an implicit "go"?  If so go to (K)
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    #Ifdef LanguageIsVerb;
    if (verb_word == 0) {
        i = wn; verb_word = LanguageIsVerb(buffer, parse, verb_wordnum);
        wn = i;
    }
    #Endif; ! LanguageIsVerb

    ! If the first word is not listed as a verb, it must be a direction
    ! or the name of someone to talk to

    if (verb_word == 0 || ((verb_word->#dict_par1) & DICT_VERB) == 0) {

        ! So is the first word an object contained in the special object "Compass"
        ! (i.e., a direction)?  This needs use of NounDomain, a routine which
        ! does the object matching, returning the object number, or 0 if none found,
        ! or REPARSE_CODE if it has restructured the parse table so the whole parse
        ! must be begun again...

        wn = verb_wordnum; indef_mode = false; token_filter = 0;
        l = NounDomain(Compass, 0, NOUN_TOKEN);
        if (l == REPARSE_CODE) jump ReParse;

        ! If it is a direction, send back the results:
        ! action=GoSub, no of arguments=1, argument 1=the direction.

        if (l ~= 0) {
            results-->0 = ##Go;
            action_to_be = ##Go;
            results-->1 = 1;
            results-->2 = l;
            jump LookForMore;
        }

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! C: Is anyone being addressed?
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

        ! Only check for a comma (a "someone, do something" command) if we are
        ! not already in the middle of one.  (This simplification stops us from
        ! worrying about "robot, wizard, you are an idiot", telling the robot to
        ! tell the wizard that she is an idiot.)

        if (actor == player) {
            for (j=2 : j<=num_words : j++) {
                i=NextWord();
                if (i == comma_word) jump Conversation;
            }
        }
        vw = verb_word;
        verb_word = UnknownVerb(vw);
        if (verb_word == false) verb_word = LibraryExtensions.RunWhile(ext_unknownverb, false, vw);
        if (verb_word) jump VerbAccepted;
        best_etype = VERB_PE;
        jump GiveError;

        ! NextWord nudges the word number wn on by one each time, so we've now
        ! advanced past a comma.  (A comma is a word all on its own in the table.)

      .Conversation;

        j = wn - 1;
        if (j == 1) {
            L__M(##Miscellany, 22);
            jump ReType;
        }

        ! Use NounDomain (in the context of "animate creature") to see if the
        ! words make sense as the name of someone held or nearby

        wn = 1; lookahead = HELD_TOKEN;
        scope_reason = TALKING_REASON;
        l = NounDomain(player,actors_location,CREATURE_TOKEN);
        scope_reason = PARSING_REASON;
        if (l == REPARSE_CODE) jump ReParse;
        if (l == 0) {
            L__M(##Miscellany, 23);
            jump ReType;
        }

      .Conversation2;

        ! The object addressed must at least be "talkable" if not actually "animate"
        ! (the distinction allows, for instance, a microphone to be spoken to,
        ! without the parser thinking that the microphone is human).

        if (l hasnt animate && l hasnt talkable) {
            L__M(##Miscellany, 24, l);
            jump ReType;
        }

        ! Check that there aren't any mystery words between the end of the person's
        ! name and the comma (eg, throw out "dwarf sdfgsdgs, go north").

        if (wn ~= j) {
            L__M(##Miscellany, 25);
            jump ReType;
        }

        ! The player has now successfully named someone.  Adjust "him", "her", "it":

        PronounNotice(l);

        ! Set the global variable "actor", adjust the number of the first word,
        ! and begin parsing again from there.

        verb_wordnum = j + 1;

        ! Stop things like "me, again":

        if (l == player) {
            wn = verb_wordnum;
            if (NextWordStopped() == AGAIN1__WD or AGAIN2__WD or AGAIN3__WD) {
                L__M(##Miscellany, 20);
                jump ReType;
            }
        }

        actor = l;
        actors_location = ScopeCeiling(l);
        #Ifdef DEBUG;
        if (parser_trace >= 1)
            print "[Actor is ", (the) actor, " in ", (name) actors_location, "]^";
        #Endif; ! DEBUG
        jump BeginCommand;

    } ! end of first-word-not-a-verb

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! D: Get the verb: try all the syntax lines for that verb
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  .VerbAccepted;

    ! We now definitely have a verb, not a direction, whether we got here by the
    ! "take ..." or "person, take ..." method.  Get the meta flag for this verb:

    meta = (verb_word->#dict_par1) & DICT_META;

    ! You can't order other people to "full score" for you, and so on...

    if (meta && actor ~= player) {
        best_etype = VERB_PE;
        meta = false;
        jump GiveError;
    }

    ! Now let i be the corresponding verb number, stored in the dictionary entry
    ! (in a peculiar 255-n fashion for traditional Infocom reasons)...

    i = DictionaryWordToVerbNum(verb_word);

    ! ...then look up the i-th entry in the verb table, whose address is at word
    ! 7 in the Z-machine (in the header), so as to get the address of the syntax
    ! table for the given verb...

    #Ifdef TARGET_ZCODE;
    syntax = (HDR_STATICMEMORY-->0)-->i;
    #Ifnot; ! TARGET_GLULX
    syntax = (#grammar_table)-->(i+1);
    #Endif; ! TARGET_

    ! ...and then see how many lines (ie, different patterns corresponding to the
    ! same verb) are stored in the parse table...

    num_lines = (syntax->0) - 1;

    ! ...and now go through them all, one by one.
    ! To prevent pronoun_word 0 being misunderstood,

    pronoun_word = NULL; pronoun_obj = NULL;

    #Ifdef DEBUG;
    if (parser_trace >= 1) print "[Parsing for the verb '", (address) verb_word, "' (", num_lines+1, " lines)]^";
    #Endif; ! DEBUG

    best_etype = STUCK_PE; nextbest_etype = STUCK_PE;
    multiflag = false; saved_oops = 0;

    ! "best_etype" is the current failure-to-match error - it is by default
    ! the least informative one, "don't understand that sentence".
    ! "nextbest_etype" remembers the best alternative to having to ask a
    ! scope token for an error message (i.e., the best not counting ASKSCOPE_PE).
    ! multiflag is used here to prevent inappropriate MULTI_PE errors
    ! in addition to its unrelated duties passing information to action routines

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! E: Break down a syntax line into analysed tokens
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    line_address = syntax + 1;

    for (line=0 : line<=num_lines : line++) {

        for (i=0 : i<32 : i++) {
            line_token-->i = ENDIT_TOKEN;
            line_ttype-->i = ELEMENTARY_TT;
            line_tdata-->i = ENDIT_TOKEN;
        }

        ! Unpack the syntax line from Inform format into three arrays; ensure that
        ! the sequence of tokens ends in an ENDIT_TOKEN.

        line_address = UnpackGrammarLine(line_address);

        #Ifdef DEBUG;
        if (parser_trace >= 1) {
            if (parser_trace >= 2) new_line;
            print "[line ", line; DebugGrammarLine();
            print "]^";
        }
        #Endif; ! DEBUG

        ! We aren't in "not holding" or inferring modes, and haven't entered
        ! any parameters on the line yet, or any special numbers; the multiple
        ! object is still empty.

        token_filter = 0;
        not_holding = 0;
        inferfrom = 0;
        parameters = 0;
        nsns = 0; special_word = 0; special_number = 0;
        multiple_object-->0 = 0;
        multi_context = 0;
        etype = STUCK_PE; line_etype = 100;

        ! Put the word marker back to just after the verb

        wn = verb_wordnum+1;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! F: Look ahead for advance warning for multiexcept/multiinside
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

        ! There are two special cases where parsing a token now has to be
        ! affected by the result of parsing another token later, and these
        ! two cases (multiexcept and multiinside tokens) are helped by a quick
        ! look ahead, to work out the future token now.  We can only carry this
        ! out in the simple (but by far the most common) case:
        !
        !     multiexcept <one or more prepositions> noun
        !
        ! and similarly for multiinside.

        advance_warning = NULL; indef_mode = false;
        for (i=0,m=false,pcount=0 : line_token-->pcount ~= ENDIT_TOKEN : pcount++) {
            scope_token = 0;

            if (line_ttype-->pcount ~= PREPOSITION_TT) i++;

            if (line_ttype-->pcount == ELEMENTARY_TT) {
                if (line_tdata-->pcount == MULTI_TOKEN) m = true;
                if (line_tdata-->pcount == MULTIEXCEPT_TOKEN or MULTIINSIDE_TOKEN  && i == 1) {
                    ! First non-preposition is "multiexcept" or
                    ! "multiinside", so look ahead.

                    #Ifdef DEBUG;
                    if (parser_trace >= 2) print " [Trying look-ahead]^";
                    #Endif; ! DEBUG

                    ! We need this to be followed by 1 or more prepositions.

                    pcount++;
                    if (line_ttype-->pcount == PREPOSITION_TT) {
                        ! skip ahead to a preposition word in the input
                        do {
                            l = NextWord();
                        } until ((wn > num_words) ||
                                 (l && (l->#dict_par1) & DICT_PREP ~= 0));

                        if (wn > num_words) {
                            #Ifdef DEBUG;
                            if (parser_trace >= 2)
                                print " [Look-ahead aborted: prepositions missing]^";
                            #Endif;
                            jump EmptyLine;
                        }

                        do {
                            if (PrepositionChain(l, pcount) ~= -1) {
                                ! advance past the chain
                                if ((line_token-->pcount)->0 & $20 ~= 0) {
                                    pcount++;
                                    while ((line_token-->pcount ~= ENDIT_TOKEN) &&
                                           ((line_token-->pcount)->0 & $10 ~= 0))
                                        pcount++;
                                } else {
                                    pcount++;
                                }
                            } else {
                                ! try to find another preposition word
                                do {
                                    l = NextWord();
                                } until ((wn >= num_words) ||
                                         (l && (l->#dict_par1) & 8 ~= 0));

                                if (l && (l->#dict_par1) & 8) continue;

                                ! lookahead failed
                                #Ifdef DEBUG;
                                if (parser_trace >= 2)
                                    print " [Look-ahead aborted: prepositions don't match]^";
                                #Endif;
                                jump LineFailed;
                            }
                            l = NextWord();
                        } until (line_ttype-->pcount ~= PREPOSITION_TT);

                        .EmptyLine;
                        ! put back the non-preposition we just read
                        wn--;

                        if ((line_ttype-->pcount == ELEMENTARY_TT) && (line_tdata-->pcount == NOUN_TOKEN)) {
                            l = Descriptors();  ! skip past THE etc
                            if (l~=0) etype=l;  ! don't allow multiple objects
                            l = NounDomain(actors_location, actor, NOUN_TOKEN);

                            #Ifdef DEBUG;
                            if (parser_trace >= 2) {
                                print " [Advanced to ~noun~ token: ";
                                if (l == REPARSE_CODE) print "re-parse request]^";
                                if (l == 1) print "but multiple found]^";
                                if (l == 0) print "error ", etype, "]^";
                                if (l >= 2) print (the) l, "]^";
                            }
                            #Endif; ! DEBUG
                            if (l == REPARSE_CODE) jump ReParse;
                            if (l >= 2) advance_warning = l;
                        }
                    }
                    break;
                }
            }
        }

        ! Slightly different line-parsing rules will apply to "take multi", to
        ! prevent "take all" behaving correctly but misleadingly when there's
        ! nothing to take.

        take_all_rule = 0;
        if (m && params_wanted == 1 && action_to_be == ##Take)
            take_all_rule = 1;

        ! And now start again, properly, forearmed or not as the case may be.
        ! As a precaution, we clear all the variables again (they may have been
        ! disturbed by the call to NounDomain, which may have called outside
        ! code, which may have done anything!).

        not_holding = 0;
        inferfrom = 0;
        inferword = 0;
        parameters = 0;
        nsns = 0; special_word = 0; special_number = 0;
        multiple_object-->0 = 0;
        etype = STUCK_PE; line_etype = 100;
        wn = verb_wordnum+1;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! G: Parse each token in turn (calling ParseToken to do most of the work)
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

        ! "Pattern" gradually accumulates what has been recognised so far,
        ! so that it may be reprinted by the parser later on

        for (pcount=1 : : pcount++) {
            pattern-->pcount = PATTERN_NULL; scope_token = 0;

            token = line_token-->(pcount-1);
            lookahead = line_token-->pcount;

            #Ifdef DEBUG;
            if (parser_trace >= 2)
                print " [line ", line, " token ", pcount, " word ", wn, " : ", (DebugToken) token,
                  "]^";
            #Endif; ! DEBUG

            if (token ~= ENDIT_TOKEN) {
                scope_reason = PARSING_REASON;
                parser_inflection = name;
                parser_inflection_func = false;
                AnalyseToken(token);

                if (action_to_be == ##AskTo && found_ttype == ELEMENTARY_TT &&
                    found_tdata == TOPIC_TOKEN && line_etype == 100) {
                    if (actor ~= player) {
                        best_etype = VERB_PE; jump GiveError;
                    }
                    l = inputobjs-->2;
                    wn--;
                    j = wn;
                    jump Conversation2;
                }

                l = ParseToken__(found_ttype, found_tdata, pcount-1, token);
                while (l<-200) l = ParseToken__(ELEMENTARY_TT, l + 256);
                scope_reason = PARSING_REASON;

                if (l == GPR_PREPOSITION) {
                    if (found_ttype~=PREPOSITION_TT && (found_ttype~=ELEMENTARY_TT ||
                        found_tdata~=TOPIC_TOKEN)) params_wanted--;
                    l = true;
                }
                else
                    if (l < 0) l = false;
                    else
                        if (l ~= GPR_REPARSE) {
                            if (l == GPR_NUMBER) {
                                if (nsns == 0) special_number1 = parsed_number;
                                else special_number2 = parsed_number;
                                nsns++; l = 1;
                            }
                            if (l == GPR_MULTIPLE) l = 0;
                            results-->(parameters+2) = l;
                            parameters++;
                            pattern-->pcount = l;
                            l = true;
                        }

                #Ifdef DEBUG;
                if (parser_trace >= 3) {
                    print "  [token resulted in ";
                    if (l == REPARSE_CODE) print "re-parse request]^";
                    if (l == 0) print "failure with error type ", etype, "]^";
                    if (l == 1) print "success]^";
                }
                #Endif; ! DEBUG

                if (l == REPARSE_CODE) jump ReParse;
                if (l == false) {
                    if (etype < line_etype) line_etype = etype;
                    if (etype == STUCK_PE || wn >= num_words) break;
                }
            }
            else {

                ! If the player has entered enough already but there's still
                ! text to wade through: store the pattern away so as to be able to produce
                ! a decent error message if this turns out to be the best we ever manage,
                ! and in the mean time give up on this line

                ! However, if the superfluous text begins with a comma or "then" then
                ! take that to be the start of another instruction

                if (line_etype < 100) break;
                if (wn <= num_words) {
                    l = NextWord();
                    if (l == THEN1__WD or THEN2__WD or THEN3__WD or comma_word or AND1__WD) {
                        held_back_mode = 1; hb_wn = wn-1;
                    }
                    else {
                        for (m=0 : m<32 : m++) pattern2-->m = pattern-->m;
                        pcount2 = pcount;
                        etype = UPTO_PE;
                        break;
                    }
                }

                ! Now, we may need to revise the multiple object because of the single one
                ! we now know (but didn't when the list was drawn up).

                if (parameters >= 1 && results-->2 == 0) {
                    l = ReviseMulti(results-->3);
                    if (l ~= 0) { etype = l; results-->0 = action_to_be; break; }
                }
                if (parameters >= 2 && results-->3 == 0) {
                    l = ReviseMulti(results-->2);
                    if (l ~= 0) { etype = l; break; }
                }

                ! To trap the case of "take all" inferring only "yourself" when absolutely
                ! nothing else is in the vicinity...

                if (take_all_rule == 2 && results-->2 == actor) {
                    best_etype = NOTHING_PE;
                    jump GiveError;
                }

                #Ifdef DEBUG;
                if (parser_trace >= 1) print "[Line successfully parsed]^";
                #Endif; ! DEBUG

                ! The line has successfully matched the text.  Declare the input error-free...

                oops_from = 0;

                ! ...explain any inferences made (using the pattern)...

                if (inferfrom ~= 0 && no_infer_message == false) {
                    print "("; PrintCommand(inferfrom); print ")^";
                }
                no_infer_message = false;

                ! ...copy the action number, and the number of parameters...

                results-->0 = action_to_be;
                results-->1 = parameters;

                ! ...reverse first and second parameters if need be...

                if (action_reversed && parameters == 2) {
                    i = results-->2; results-->2 = results-->3;
                    results-->3 = i;
                    if (nsns == 2) {
                        i = special_number1; special_number1 = special_number2;
                        special_number2 = i;
                    }
                }

                ! ...and to reset "it"-style objects to the first of these parameters, if
                ! there is one (and it really is an object)...

                if (parameters > 0 && results-->2 >= 2)
                    PronounNotice(results-->2);

                ! ...and worry about the case where an object was allowed as a parameter
                ! even though the player wasn't holding it and should have been: in this
                ! event, keep the results for next time round, go into "not holding" mode,
                ! and for now tell the player what's happening and return a "take" request
                ! instead...

                if (not_holding ~= 0 && actor == player) {
                    action = ##Take;
                    i = RunRoutines(not_holding, before_implicit);
                    ! i = 0: Take the object, tell the player (default)
                    ! i = 1: Take the object, don't tell the player
                    ! i = 2: don't Take the object, continue
                    ! i = 3: don't Take the object, don't continue
                    if (i > 2 || no_implicit_actions) { best_etype = NOTHELD_PE; jump GiveError; }
                    ! perform the implicit Take
                    if (i < 2) {
                        if (i ~= 1)     ! and tell the player
                            L__M(##Miscellany, 26, not_holding);
                        notheld_mode = 1;
                        for (i=0 : i<8 : i++) kept_results-->i = results-->i;
                        results-->0 = ##Take;
                        results-->1 = 1;
                        results-->2 = not_holding;
                    }
                }

                ! (Notice that implicit takes are only generated for the player, and not
                ! for other actors.  This avoids entirely logical, but misleading, text
                ! being printed.)

                ! ...and return from the parser altogether, having successfully matched
                ! a line.

                if (held_back_mode == 1) {
                    wn=hb_wn;
                    jump LookForMore;
                }
                rtrue;

            } ! end of if(token ~= ENDIT_TOKEN) else
        } ! end of for(pcount++)

        .LineFailed;
        ! The line has failed to match.
        ! We continue the outer "for" loop, trying the next line in the grammar.

        if (line_etype < 100) etype = line_etype;
        if (etype > best_etype) best_etype = etype;
        if (etype ~= ASKSCOPE_PE && etype > nextbest_etype) nextbest_etype = etype;

        ! ...unless the line was something like "take all" which failed because
        ! nothing matched the "all", in which case we stop and give an error now.

        if (take_all_rule == 2 && etype==NOTHING_PE) break;

    } ! end of for(line++)

    ! The grammar is exhausted: every line has failed to match.

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! H: Cheaply parse otherwise unrecognised conversation and return
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  .GiveError;

    etype = best_etype;

    ! Errors are handled differently depending on who was talking.
    ! If the command was addressed to somebody else (eg, "dwarf, sfgh") then
    ! it is taken as conversation which the parser has no business in disallowing.

    if (actor ~= player) {
        if (usual_grammar_after ~= 0) {
            verb_wordnum = usual_grammar_after;
            jump AlmostReParse;
        }
        wn = verb_wordnum;
        special_word = NextWord();
        if (special_word == comma_word) {
            special_word = NextWord();
            verb_wordnum++;
        }
        special_number = TryNumber(verb_wordnum);
        results-->0 = ##NotUnderstood;
        results-->1 = 2;
        results-->2 = 1; special_number1 = special_word;
        results-->3 = actor;
        consult_from = verb_wordnum; consult_words = num_words-consult_from+1;
        rtrue;
    }

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! I: Print best possible error message
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! If the player was the actor (eg, in "take dfghh") the error must be
    ! printed, and fresh input called for.  In four cases the oops word
    ! must be jiggled (where oops_from is set to something).

    if (ParserError(etype)) jump ReType;
    if (LibraryExtensions.RunWhile(ext_parsererror, false, etype)) jump ReType;
    pronoun_word = pronoun__word; pronoun_obj = pronoun__obj;

    if (etype == STUCK_PE) {    L__M(##Miscellany, 27); oops_from = 1; }
    if (etype == UPTO_PE) {     L__M(##Miscellany, 28);
        for (m=0 : m<32 : m++) pattern-->m = pattern2-->m;
        pcount = pcount2; PrintCommand(0); L__M(##Miscellany, 56);
        oops_from = wn-1;
    }
    if (etype == NUMBER_PE)     L__M(##Miscellany, 29);
    if (etype == CANTSEE_PE) {  L__M(##Miscellany, 30); oops_from=saved_oops;}
    if (etype == TOOLIT_PE)     L__M(##Miscellany, 31);
    if (etype == NOTHELD_PE) {
                if (parent(noun) has container)
                        L__M(##Take, 14, noun);
                else
                        L__M(##Miscellany, 32, not_holding);
                oops_from=saved_oops;
    }
    if (etype == MULTI_PE)      L__M(##Miscellany, 33);
    if (etype == MMULTI_PE)     L__M(##Miscellany, 34);
    if (etype == VAGUE_PE)      L__M(##Miscellany, 35, pronoun_word);
    if (etype == EXCEPT_PE)     L__M(##Miscellany, 36);
    if (etype == ANIMA_PE)      L__M(##Miscellany, 37);
    if (etype == VERB_PE)       L__M(##Miscellany, 38);
    if (etype == SCENERY_PE)    L__M(##Miscellany, 39);
    if (etype == ITGONE_PE) {
        if (pronoun_obj == NULL)
                                L__M(##Miscellany, 35, pronoun_word);
        else                    L__M(##Miscellany, 40, pronoun_word, pronoun_obj);
    }
    if (etype == JUNKAFTER_PE)  L__M(##Miscellany, 41);
    if (etype == TOOFEW_PE)     L__M(##Miscellany, 42, multi_had);
    if (etype == NOTHING_PE) {
        if (results-->0 == ##Remove && results-->3 ofclass Object) {
            noun = results-->3; ! ensure valid for messages
            if (noun has animate) L__M(##Miscellany, 44, verb_word);
            else if (noun hasnt container or supporter) L__M(##Insert, 2, noun);
            else if (noun has container && noun hasnt open) L__M(##Take, 9, noun);
            else if (children(noun)==0) L__M(##Search, 6, noun);
            else results-->0 = 0;
        }
        if (results-->0 ~= ##Remove) {
            if (multi_wanted == 100)    L__M(##Miscellany, 43);
            else {
                #Ifdef NO_TAKE_ALL;
                if (take_all_rule == 2) L__M(##Miscellany, 59);
                else                    L__M(##Miscellany, 44, verb_word);
                #Ifnot;
                L__M(##Miscellany, 44, verb_word);
                #Endif; ! NO_TAKE_ALL
            }
        }
    }
    if (etype == ASKSCOPE_PE) {
        scope_stage = 3;
        if (scope_error() == -1) {
            best_etype = nextbest_etype;
            jump GiveError;
        }
    }

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! J: Retry the whole lot
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! And go (almost) right back to square one...

    jump ReType;

    ! ...being careful not to go all the way back, to avoid infinite repetition
    ! of a deferred command causing an error.


    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! K: Last thing: check for "then" and further instructions(s), return.
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! At this point, the return value is all prepared, and we are only looking
    ! to see if there is a "then" followed by subsequent instruction(s).

  .LookForMore;

    if (wn > num_words) rtrue;

    i = NextWord();
    if (i == THEN1__WD or THEN2__WD or THEN3__WD or comma_word or AND1__WD) {
        if (wn > num_words) {
           held_back_mode = false;
           return;
        }
        i = WordAddress(verb_wordnum);
        j = WordAddress(wn);
        for (: i<j : i++) i->0 = ' ';
        i = NextWord();
        if (i == AGAIN1__WD or AGAIN2__WD or AGAIN3__WD) {
            ! Delete the words "then again" from the again buffer,
            ! in which we have just realised that it must occur:
            ! prevents an infinite loop on "i. again"

            i = WordAddress(wn-2)-buffer;
            if (wn > num_words) j = INPUT_BUFFER_LEN-1;
            else j = WordAddress(wn)-buffer;
            for (: i<j : i++) buffer3->i = ' ';
        }
        Tokenise__(buffer,parse);
        held_back_mode = true;
        return;
    }
    best_etype = UPTO_PE;
    jump GiveError;

]; ! end of Parser__parse

[ ScopeCeiling person act;
  act = parent(person);
  if (act == 0) return person;
  if (person == player && location == thedark) return thedark;
  while (parent(act)~=0 && (act has transparent || act has supporter ||
                           (act has container && act has open)))
      act = parent(act);
  return act;
];

! ----------------------------------------------------------------------------
!  Descriptors()
!
!  Handles descriptive words like "my", "his", "another" and so on.
!  Skips "the", and leaves wn pointing to the first misunderstood word.
!
!  Allowed to set up for a plural only if allow_p is set
!
!  Returns error number, or 0 if no error occurred
! ----------------------------------------------------------------------------

Constant OTHER_BIT  =   1;     !  These will be used in Adjudicate()
Constant MY_BIT     =   2;     !  to disambiguate choices
Constant THAT_BIT   =   4;
Constant PLURAL_BIT =   8;
Constant LIT_BIT    =  16;
Constant UNLIT_BIT  =  32;

[ ResetDescriptors;
    indef_mode = 0; indef_type = 0; indef_wanted = 0; indef_guess_p = 0;
    indef_possambig = false;
    indef_owner = nothing;
    indef_cases = $$111111111111;
    indef_nspec_at = 0;
];

[ Descriptors  allows_multiple o x flag cto type m n;
    ResetDescriptors();
    if (wn > num_words) return 0;
    m = wn;
    for (flag=true : flag :) {
        o = NextWordStopped(); flag = false;
       for (x=1 : x<=LanguageDescriptors-->0 : x=x+4)
            if (o == LanguageDescriptors-->x) {
                flag = true;
                type = LanguageDescriptors-->(x+2);
                if (type ~= DEFART_PK) indef_mode = true;
                indef_possambig = true;
                indef_cases = indef_cases & (LanguageDescriptors-->(x+1));
                if (type == POSSESS_PK) {
                    cto = LanguageDescriptors-->(x+3);
                    switch (cto) {
                      0: indef_type = indef_type | MY_BIT;
                      1: indef_type = indef_type | THAT_BIT;
                      default:
                        indef_owner = PronounValue(cto);
                        if (indef_owner == NULL) indef_owner = InformParser;
                    }
                }
                if (type == light)  indef_type = indef_type | LIT_BIT;
                if (type == -light) indef_type = indef_type | UNLIT_BIT;
            }
        if (o == OTHER1__WD or OTHER2__WD or OTHER3__WD) {
            indef_mode = 1; flag = 1;
            indef_type = indef_type | OTHER_BIT;
        }
        if (o == ALL1__WD or ALL2__WD or ALL3__WD or ALL4__WD or ALL5__WD) {
            indef_mode = 1; flag = 1; indef_wanted = 100;
            if (take_all_rule == 1) take_all_rule = 2;
            indef_type = indef_type | PLURAL_BIT;
        }
        if (allow_plurals && allows_multiple) {
            n = TryNumber(wn-1);
            if (n == 1) { indef_mode = 1; flag = 1; indef_wanted = 1; }
            if (n > 1) {
                indef_guess_p = 1;
                indef_mode = 1; flag = 1; indef_wanted = n;
                indef_nspec_at = wn-1;
                indef_type = indef_type | PLURAL_BIT;
            }
        }
        if (flag == 1 && NextWordStopped() ~= OF1__WD or OF2__WD or OF3__WD or OF4__WD)
            wn--;  ! Skip 'of' after these
    }
    wn--;
    num_desc = wn - m;
    return 0;
];

! ----------------------------------------------------------------------------
!  CreatureTest: Will this person do for a "creature" token?
! ----------------------------------------------------------------------------

[ CreatureTest obj;
    if (actor ~= player) rtrue;
    if (obj has animate) rtrue;
    if (obj hasnt talkable) rfalse;
    if (action_to_be == ##Ask or ##Answer or ##Tell or ##AskFor) rtrue;
    rfalse;
];

[ PrepositionChain wd index;
    if (line_tdata-->index == wd) return wd;
    if ((line_token-->index)->0 & $20 == 0) return -1;
    do {
        if (line_tdata-->index == wd) return wd;
        index++;
    } until ((line_token-->index == ENDIT_TOKEN) || (((line_token-->index)->0 & $10) == 0));
    return -1;
];

! ----------------------------------------------------------------------------
!  ParseToken(type, data):
!      Parses the given token, from the current word number wn, with exactly
!      the specification of a general parsing routine.
!      (Except that for "topic" tokens and prepositions, you need to supply
!      a position in a valid grammar line as third argument.)
!
!  Returns:
!    GPR_REPARSE  for "reconstructed input, please re-parse from scratch"
!    GPR_PREPOSITION  for "token accepted with no result"
!    $ff00 + x    for "please parse ParseToken(ELEMENTARY_TT, x) instead"
!    0            for "token accepted, result is the multiple object list"
!    1            for "token accepted, result is the number in parsed_number"
!    object num   for "token accepted with this object as result"
!    -1           for "token rejected"
!
!  (A)            Analyse the token; handle all tokens not involving
!                 object lists and break down others into elementary tokens
!  (B)            Begin parsing an object list
!  (C)            Parse descriptors (articles, pronouns, etc.) in the list
!  (D)            Parse an object name
!  (E)            Parse connectives ("and", "but", etc.) and go back to (C)
!  (F)            Return the conclusion of parsing an object list
! ----------------------------------------------------------------------------

[ ParseToken given_ttype given_tdata token_n x y;
    x = lookahead; lookahead = NOUN_TOKEN;
    y = ParseToken__(given_ttype,given_tdata,token_n);
    if (y == GPR_REPARSE) Tokenise__(buffer,parse);
    lookahead = x; return y;
];

[ ParseToken__ given_ttype given_tdata token_n
             token l o i j k and_parity single_object desc_wn many_flag
             token_allows_multiple prev_indef_wanted;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! A: Analyse token; handle all not involving object lists, break down others
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    token_filter = 0;

    switch (given_ttype) {
      ELEMENTARY_TT:
        switch (given_tdata) {
          SPECIAL_TOKEN:
            l = TryNumber(wn);
            special_word = NextWord();
            #Ifdef DEBUG;
            if (l ~= -1000)
                if (parser_trace >= 3) print "  [Read special as the number ", l, "]^";
            #Endif; ! DEBUG
            if (l == -1000) {
                #Ifdef DEBUG;
                if (parser_trace >= 3) print "  [Read special word at word number ", wn, "]^";
                #Endif; ! DEBUG
                l = special_word;
            }
            parsed_number = l; return GPR_NUMBER;

          NUMBER_TOKEN:
            l=TryNumber(wn++);
            if (l == -1000) { etype = NUMBER_PE; return GPR_FAIL; }
            #Ifdef DEBUG;
            if (parser_trace>=3) print "  [Read number as ", l, "]^";
            #Endif; ! DEBUG
            parsed_number = l; return GPR_NUMBER;

          CREATURE_TOKEN:
            if (action_to_be == ##Answer or ##Ask or ##AskFor or ##Tell)
                scope_reason = TALKING_REASON;

          TOPIC_TOKEN:
            consult_from = wn;
            if ((line_ttype-->(token_n+1) ~= PREPOSITION_TT) &&
               (line_token-->(token_n+1) ~= ENDIT_TOKEN))
                RunTimeError(13);
            do o = NextWordStopped();
            until (o == -1 || PrepositionChain(o, token_n+1) ~= -1);
            wn--;
            consult_words = wn-consult_from;
            if (consult_words == 0) return GPR_FAIL;
            if (action_to_be == ##Ask or ##Answer or ##Tell) {
                o = wn; wn = consult_from; parsed_number = NextWord();
                #Ifdef EnglishNaturalLanguage;
                if (parsed_number == 'the' && consult_words > 1) parsed_number=NextWord();
                #Endif; ! EnglishNaturalLanguage
                wn = o; return 1;
            }
            if (o==-1 && (line_ttype-->(token_n+1) == PREPOSITION_TT))
                return GPR_FAIL;    ! don't infer if required preposition is absent
            return GPR_PREPOSITION;
        }

      PREPOSITION_TT:
        #Iffalse (Grammar__Version == 1);
        ! Is it an unnecessary alternative preposition, when a previous choice
        ! has already been matched?
        if ((token->0) & $10) return GPR_PREPOSITION;
        #Endif; ! Grammar__Version

        ! If we've run out of the player's input, but still have parameters to
        ! specify, we go into "infer" mode, remembering where we are and the
        ! preposition we are inferring...

        if (wn > num_words) {
            if (inferfrom==0 && parameters<params_wanted) {
                inferfrom = pcount; inferword = token;
                pattern-->pcount = REPARSE_CODE + Dword__No(given_tdata);
            }

            ! If we are not inferring, then the line is wrong...

            if (inferfrom == 0) return -1;

            ! If not, then the line is right but we mark in the preposition...

            pattern-->pcount = REPARSE_CODE + Dword__No(given_tdata);
            return GPR_PREPOSITION;
        }

        o = NextWord();

        pattern-->pcount = REPARSE_CODE + Dword__No(o);

        ! Whereas, if the player has typed something here, see if it is the
        ! required preposition... if it's wrong, the line must be wrong,
        ! but if it's right, the token is passed (jump to finish this token).

        if (o == given_tdata) return GPR_PREPOSITION;
        #Iffalse (Grammar__Version == 1);
        if (PrepositionChain(o, token_n) ~= -1) return GPR_PREPOSITION;
        #Endif; ! Grammar__Version
        return -1;

      GPR_TT:
        l = given_tdata();
        #Ifdef DEBUG;
        if (parser_trace >= 3) print "  [Outside parsing routine returned ", l, "]^";
        #Endif; ! DEBUG
        return l;

      SCOPE_TT:
        scope_token = given_tdata;
        scope_stage = 1;
        l = scope_token();
        #Ifdef DEBUG;
        if (parser_trace >= 3) print "  [Scope routine returned multiple-flag of ", l, "]^";
        #Endif; ! DEBUG
        if (l == 1) given_tdata = MULTI_TOKEN; else given_tdata = NOUN_TOKEN;

      ATTR_FILTER_TT:
        token_filter = 1 + given_tdata;
        given_tdata = NOUN_TOKEN;

      ROUTINE_FILTER_TT:
        token_filter = given_tdata;
        given_tdata = NOUN_TOKEN;

    } ! end of switch(given_ttype)

    token = given_tdata;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! B: Begin parsing an object list
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! There are now three possible ways we can be here:
    !     parsing an elementary token other than "special" or "number";
    !     parsing a scope token;
    !     parsing a noun-filter token (either by routine or attribute).
    !
    ! In each case, token holds the type of elementary parse to
    ! perform in matching one or more objects, and
    ! token_filter is 0 (default), an attribute + 1 for an attribute filter
    ! or a routine address for a routine filter.

    token_allows_multiple = false;
    if (token == MULTI_TOKEN or MULTIHELD_TOKEN or MULTIEXCEPT_TOKEN or MULTIINSIDE_TOKEN)
        token_allows_multiple = true;

    many_flag = false; and_parity = true; dont_infer = false;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! C: Parse descriptors (articles, pronouns, etc.) in the list
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! We expect to find a list of objects next in what the player's typed.

  .ObjectList;

    #Ifdef DEBUG;
    if (parser_trace >= 3) print "  [Object list from word ", wn, "]^";
    #Endif; ! DEBUG

    ! Take an advance look at the next word: if it's "it" or "them", and these
    ! are unset, set the appropriate error number and give up on the line
    ! (if not, these are still parsed in the usual way - it is not assumed
    ! that they still refer to something in scope)

    o = NextWord(); wn--;

    pronoun_word = NULL; pronoun_obj = NULL;
    l = PronounValue(o);
    if (l ~= 0) {
        pronoun_word = o; pronoun_obj = l;
        if (l == NULL) {
            ! Don't assume this is a use of an unset pronoun until the
            ! descriptors have been checked, because it might be an
            ! article (or some such) instead

            for (l=1 : l<=LanguageDescriptors-->0 : l=l+4)
                if (o == LanguageDescriptors-->l) jump AssumeDescriptor;
            pronoun__word = pronoun_word; pronoun__obj = pronoun_obj;
            etype = VAGUE_PE; return GPR_FAIL;
        }
    }

  .AssumeDescriptor;

    if (o == ME1__WD or ME2__WD or ME3__WD) { pronoun_word = o; pronoun_obj = player; }

    allow_plurals = true;
    desc_wn = wn;

  .TryAgain;

    ! First, we parse any descriptive words (like "the", "five" or "every"):
    l = Descriptors(token_allows_multiple);
    if (l ~= 0) { etype = l; return GPR_FAIL; }

  .TryAgain2;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! D: Parse an object name
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! This is an actual specified object, and is therefore where a typing error
    ! is most likely to occur, so we set:

    oops_from = wn;

    ! So, two cases.  Case 1: token not equal to "held"
    ! but we may well be dealing with multiple objects

    ! In either case below we use NounDomain, giving it the token number as
    ! context, and two places to look: among the actor's possessions, and in the
    ! present location.  (Note that the order depends on which is likeliest.)
    if (token ~= HELD_TOKEN) {
        i = multiple_object-->0;
        #Ifdef DEBUG;
        if (parser_trace >= 3) print "  [Calling NounDomain on location and actor]^";
        #Endif; ! DEBUG
        l = NounDomain(actors_location, actor, token);
        if (l == REPARSE_CODE) return l;                  ! Reparse after Q&A
        if ((metaclass(l) == Class || metaclass(l) == Object) && l ~= 1 && l notin actor && token == MULTIHELD_TOKEN or MULTIEXCEPT_TOKEN) {
            if (ImplicitTake(l)) {
                etype = NOTHELD_PE;
                jump FailToken;
            }
        }

        if (indef_wanted == 100 && l == 0 && number_matched == 0)
            l = 1;  ! ReviseMulti if TAKE ALL FROM empty container

        if (token_allows_multiple && ~~multiflag) {
            if (best_etype==MULTI_PE) best_etype=STUCK_PE;
            multiflag = true;
        }
        if (l == 0) {
            if (indef_possambig) {
                saved_ml = match_length;
                ResetDescriptors();
                wn = desc_wn;
                jump TryAgain2;
            }
            if ((etype ~=TOOFEW_PE && etype ~= VAGUE_PE) && (multiflag || etype ~= MULTI_PE))
                etype = CantSee();
            jump FailToken;
        } ! Choose best error

        #Ifdef DEBUG;
        if (parser_trace >= 3) {
            if (l > 1) print "  [NounDomain returned ", (the) l, "]^";
            else {
                print "  [NounDomain appended to the multiple object list:^";
                k = multiple_object-->0;
                for (j=i+1 : j<=k : j++)
                    print "  Entry ", j, ": ", (The) multiple_object-->j,
                          " (", multiple_object-->j, ")^";
                print "  List now has size ", k, "]^";
            }
        }
        #Endif; ! DEBUG

        if (l == 1) {
            if (~~many_flag) many_flag = true;
            else {                                ! Merge with earlier ones
                k = multiple_object-->0;            ! (with either parity)
                multiple_object-->0 = i;
                for (j=i+1 : j<=k : j++) {
                    if (and_parity) MultiAdd(multiple_object-->j);
                    else            MultiSub(multiple_object-->j);
                }
                #Ifdef DEBUG;
                if (parser_trace >= 3) print "  [Merging ", k-i, " new objects to the ", i, " old ones]^";
                #Endif; ! DEBUG
            }
        }
        else {
            ! A single object was indeed found

            if (match_length == 0 && indef_possambig) {
                ! So the answer had to be inferred from no textual data,
                ! and we know that there was an ambiguity in the descriptor
                ! stage (such as a word which could be a pronoun being
                ! parsed as an article or possessive).  It's worth having
                ! another go.

                ResetDescriptors();
                wn = desc_wn;
                jump TryAgain2;
            }

            if (token == CREATURE_TOKEN && CreatureTest(l) == 0) {
                etype = ANIMA_PE;
                jump FailToken;
            } !  Animation is required

            if (~~many_flag) single_object = l;
            else {
                if (and_parity) MultiAdd(l); else MultiSub(l);
                #Ifdef DEBUG;
                if (parser_trace >= 3) print "  [Combining ", (the) l, " with list]^";
                #Endif; ! DEBUG
            }
        }

    } else {
    ! Case 2: token is "held" (which fortunately can't take multiple objects)
    ! and may generate an implicit take
        l = NounDomain(actor,actors_location,token);       ! Same as above...
        if (l == REPARSE_CODE) return GPR_REPARSE;
        if (l == 0) {
            if (indef_possambig) {
                ResetDescriptors();
                wn = desc_wn;
                jump TryAgain2;
            }
            etype = CantSee(); jump FailToken;            ! Choose best error
        }

        ! ...until it produces something not held by the actor.  Then an implicit
        ! take must be tried.  If this is already happening anyway, things are too
        ! confused and we have to give up (but saving the oops marker so as to get
        ! it on the right word afterwards).
        ! The point of this last rule is that a sequence like
        !
        !     > read newspaper
        !     (taking the newspaper first)
        !     The dwarf unexpectedly prevents you from taking the newspaper!
        !
        ! should not be allowed to go into an infinite repeat - read becomes
        ! take then read, but take has no effect, so read becomes take then read...
        ! Anyway for now all we do is record the number of the object to take.

        o = parent(l);

        if (o ~= actor) {
            if (notheld_mode == 1) {
                saved_oops = oops_from;
                etype = NOTHELD_PE;
                jump FailToken;
            }
            not_holding = l;
            #Ifdef DEBUG;
            if (parser_trace >= 3) print "  [Allowing object ", (the) l, " for now]^";
            #Endif; ! DEBUG
        }
        single_object = l;
    } ! end of if (token ~= HELD_TOKEN) else

    ! The following moves the word marker to just past the named object...

    wn = oops_from + match_length;

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! E: Parse connectives ("and", "but", etc.) and go back to (C)
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! Object(s) specified now: is that the end of the list, or have we reached
    ! "and", "but" and so on?  If so, create a multiple-object list if we
    ! haven't already (and are allowed to).

  .NextInList;

    o = NextWord();

    if (o == AND1__WD or AND2__WD or AND3__WD or BUT1__WD or BUT2__WD or BUT3__WD or comma_word) {

        #Ifdef DEBUG;
        if (parser_trace >= 3) print "  [Read connective '", (address) o, "']^";
        #Endif; ! DEBUG

        k = NextWord();
        if (k ~= AND1__WD) wn--;  ! allow Serial commas in input
        if (k > 0 && (k->#dict_par1) & (DICT_NOUN+DICT_VERB) == DICT_VERB) {
            wn--; ! player meant 'THEN'
            jump PassToken;
        }
        if (~~token_allows_multiple) {
            if (multiflag) jump PassToken; ! give UPTO_PE error
            etype=MULTI_PE;
            jump FailToken;
        }

        if (o == BUT1__WD or BUT2__WD or BUT3__WD) and_parity = 1-and_parity;

        if (~~many_flag) {
            multiple_object-->0 = 1;
            multiple_object-->1 = single_object;
            many_flag = true;
            #Ifdef DEBUG;
            if (parser_trace >= 3) print "  [Making new list from ", (the) single_object, "]^";
            #Endif; ! DEBUG
        }
        dont_infer = true; inferfrom=0;           ! Don't print (inferences)
        jump ObjectList;                          ! And back around
    }

    wn--;   ! Word marker back to first not-understood word

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !
    ! F: Return the conclusion of parsing an object list
    !
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    ! Happy or unhappy endings:

  .PassToken;

    if (many_flag) {
        single_object = GPR_MULTIPLE;
        multi_context = token;
    }
    else {
        if (indef_mode == 1 && indef_type & PLURAL_BIT ~= 0) {
            if (indef_wanted < 100 && indef_wanted > 1) {
                multi_had = 1; multi_wanted = indef_wanted;
                etype = TOOFEW_PE;
                jump FailToken;
            }
        }
    }
    return single_object;

  .FailToken;

    ! If we were only guessing about it being a plural, try again but only
    ! allowing singulars (so that words like "six" are not swallowed up as
    ! Descriptors)

    noun = l;   ! Allow the noun to be mentioned by the *_PE error messages.
    if (allow_plurals && indef_guess_p == 1) {
        #Ifdef DEBUG;
        if (parser_trace >= 4) print "   [Retrying singulars after failure ", etype, "]^";
        #Endif;
        prev_indef_wanted = indef_wanted;
        allow_plurals = false;
        wn = desc_wn;
        jump TryAgain;
    }

    if ((indef_wanted > 0 || prev_indef_wanted > 0) && (~~multiflag)) etype = MULTI_PE;

    return GPR_FAIL;

]; ! end of ParseToken__

! ----------------------------------------------------------------------------
!  NounDomain does the most substantial part of parsing an object name.
!
!  It is given two "domains" - usually a location and then the actor who is
!  looking - and a context (i.e. token type), and returns:
!
!   0    if no match at all could be made,
!   1    if a multiple object was made,
!   k    if object k was the one decided upon,
!   REPARSE_CODE if it asked a question of the player and consequently rewrote
!        the player's input, so that the whole parser should start again
!        on the rewritten input.
!
!   In the case when it returns 1<k<REPARSE_CODE, it also sets the variable
!   length_of_noun to the number of words in the input text matched to the
!   noun.
!   In the case k=1, the multiple objects are added to multiple_object by
!   hand (not by MultiAdd, because we want to allow duplicates).
! ----------------------------------------------------------------------------

[ NounDomain domain1 domain2 context    first_word i j k l
                                        answer_words;
    #Ifdef DEBUG;
    if (parser_trace >= 4) {
        print "   [NounDomain called at word ", wn, "]^";
        print "   ";
        if (indef_mode) {
            print "seeking indefinite object: ";
            if (indef_type & OTHER_BIT)  print "other ";
            if (indef_type & MY_BIT)     print "my ";
            if (indef_type & THAT_BIT)   print "that ";
            if (indef_type & PLURAL_BIT) print "plural ";
            if (indef_type & LIT_BIT)    print "lit ";
            if (indef_type & UNLIT_BIT)  print "unlit ";
            if (indef_owner ~= 0) print "owner:", (name) indef_owner;
            new_line;
            print "   number wanted: ";
            if (indef_wanted == 100) print "all"; else print indef_wanted;
            new_line;
            print "   most likely GNAs of names: ", indef_cases, "^";
        }
        else print "seeking definite object^";
    }
    #Endif; ! DEBUG

    match_length = 0; number_matched = 0; match_from = wn; placed_in_flag = 0;

    SearchScope(domain1, domain2, context);

    #Ifdef DEBUG;
    if (parser_trace >= 4) print "   [NounDomain made ", number_matched, " matches]^";
    #Endif; ! DEBUG

    wn = match_from+match_length;

    ! If nothing worked at all, leave with the word marker skipped past the
    ! first unmatched word...

    if (number_matched == 0) { wn++; rfalse; }

    ! Suppose that there really were some words being parsed (i.e., we did
    ! not just infer).  If so, and if there was only one match, it must be
    ! right and we return it...
    if (match_from <= num_words) {
        if (number_matched == 1) {
            i=match_list-->0;
            if (indef_mode) {
                if ((indef_type & LIT_BIT) && i hasnt light) rfalse;
                if ((indef_type & UNLIT_BIT) && i has light) rfalse;
            }
            return i;
        }

        ! ...now suppose that there was more typing to come, i.e. suppose that
        ! the user entered something beyond this noun.  If nothing ought to follow,
        ! then there must be a mistake, (unless what does follow is just a full
        ! stop, and or comma)

        if (wn <= num_words) {
            i = NextWord(); wn--;
            if (i ~=  AND1__WD or AND2__WD or AND3__WD or comma_word
                   or THEN1__WD or THEN2__WD or THEN3__WD
                   or BUT1__WD or BUT2__WD or BUT3__WD) {
                if (lookahead == ENDIT_TOKEN) rfalse;
            }
        }
    }

    ! Now look for a good choice, if there's more than one choice...

    number_of_classes = 0;

    if (match_length == 0 && indef_mode && indef_wanted > 0 && indef_wanted < 100)
        number_matched = 0;  ! ask question for 'take three'
    if (number_matched == 1) i = match_list-->0;
    if (number_matched > 1) {
        i = Adjudicate(context);
        if (i == -1) rfalse;
        if (i == 1) rtrue;       !  Adjudicate has made a multiple
                                 !  object, and we pass it on
    }

    ! If i is non-zero here, one of two things is happening: either
    ! (a) an inference has been successfully made that object i is
    !     the intended one from the user's specification, or
    ! (b) the user finished typing some time ago, but we've decided
    !     on i because it's the only possible choice.
    ! In either case we have to keep the pattern up to date,
    ! note that an inference has been made and return.
    ! (Except, we don't note which of a pile of identical objects.)

    if (i ~= 0) {
        if (dont_infer) return i;
        if (inferfrom == 0) inferfrom=pcount;
        pattern-->pcount = i;
        return i;
    }

    ! If we get here, there was no obvious choice of object to make.  If in
    ! fact we've already gone past the end of the player's typing (which
    ! means the match list must contain every object in scope, regardless
    ! of its name), then it's foolish to give an enormous list to choose
    ! from - instead we go and ask a more suitable question...

    if (match_from > num_words) jump Incomplete;
    return AskPlayer(context);

    ! Now we come to the question asked when the input has run out
    ! and can't easily be guessed (eg, the player typed "take" and there
    ! were plenty of things which might have been meant).

  .Incomplete;

    if (best_etype == NOTHING_PE && pattern-->1 == 0) rfalse; ! for DROP when empty-handed
    if (context == CREATURE_TOKEN) L__M(##Miscellany, 48, actor);
    else                           L__M(##Miscellany, 49, actor);

    #Ifdef TARGET_ZCODE;
    for (i=2 : i<INPUT_BUFFER_LEN : i++) buffer2->i = ' ';
    #Endif; ! TARGET_ZCODE
    answer_words = Keyboard(buffer2, parse2);

    first_word = WordValue(1, parse2);
    #Ifdef LanguageIsVerb;
    if (first_word == 0) {
        j = wn; first_word = LanguageIsVerb(buffer2, parse2, 1); wn = j;
    }
    #Endif; ! LanguageIsVerb

    ! Once again, if the reply looks like a command, give it to the
    ! parser to get on with and forget about the question...

    ! Once again, if the reply looks like a command
    ! (that is, VERB ... or XXX,VERB ...), give it to the parser to get
    ! on with and forget about the question...

    if (first_word) {
        if ((first_word->#dict_par1) & DICT_VERB) {
            CopyBuffer(buffer, buffer2);
            return REPARSE_CODE;
        }
        if (NumberWords(parse2) > 2) {
            j = WordValue(2, parse2);
            k = WordValue(3, parse2);
            if (j == ',//' && k && (k->#dict_par1) & DICT_VERB) {
                CopyBuffer(buffer, buffer2);
                return REPARSE_CODE;
            }
        }
    }

    ! ...but if we have a genuine answer, then:
    !
    ! (1) we must glue in text suitable for anything that's been inferred.

    if (inferfrom ~= 0) {
        for (j=inferfrom : j<pcount : j++) {
            if (pattern-->j == PATTERN_NULL) continue;
            i = WORDSIZE + GetKeyBufLength();
            SetKeyBufLength(i-WORDSIZE + 1);
            buffer->(i++) = ' ';

            #Ifdef DEBUG;
            if (parser_trace >= 5) print "[Gluing in inference with pattern code ", pattern-->j, "]^";
            #Endif; ! DEBUG

            ! Conveniently, parse2-->1 is the first word in both ZCODE and GLULX.

            parse2-->1 = 0;

            ! An inferred object.  Best we can do is glue in a pronoun.
            ! (This is imperfect, but it's very seldom needed anyway.)

            if (pattern-->j >= 2 && pattern-->j < REPARSE_CODE) {
                ! was the inference made from some noun words?
                ! In which case, we can infer again.
                if ((WordValue(NumberWords())->#dict_par1) & DICT_NOUN) continue;
                PronounNotice(pattern-->j);
                for (k=1 : k<=LanguagePronouns-->0 : k=k+3)
                    if (pattern-->j == LanguagePronouns-->(k+2)) {
                        parse2-->1 = LanguagePronouns-->k;
                        #Ifdef DEBUG;
                        if (parser_trace >= 5) print "[Using pronoun '", (address) parse2-->1, "']^";
                        #Endif; ! DEBUG
                        break;
                    }
            }
            else {
                ! An inferred preposition.
                parse2-->1 = No__Dword(pattern-->j - REPARSE_CODE);
                #Ifdef DEBUG;
                if (parser_trace >= 5) print "[Using preposition '", (address) parse2-->1, "']^";
                #Endif; ! DEBUG
            }

            ! parse2-->1 now holds the dictionary address of the word to glue in.

            if (parse2-->1 ~= 0) {
                k = buffer + i;
                #Ifdef TARGET_ZCODE;
                @output_stream 3 k;
                print (address) parse2-->1;
                @output_stream -3;
                k = k-->0;
                for (l=i : l<i+k : l++) buffer->l = buffer->(l+2);
                #Ifnot; ! TARGET_GLULX
                k = PrintAnyToArray(buffer+i, INPUT_BUFFER_LEN-i, parse2-->1);
                l=l; ! suppress compiler warning
                #Endif; ! TARGET_
                i = i + k; SetKeyBufLength(i-WORDSIZE);
            }
        }
    }

    ! (2) we must glue the newly-typed text onto the end.

    i = WORDSIZE + GetKeyBufLength();
    buffer->(i++) = ' ';
    SetKeyBufLength(GetKeyBufLength()+1);
    for (j=0 : j<GetKeyBufLength(buffer2) : i++,j++) {
        buffer->i = buffer2->(j+WORDSIZE);
        SetKeyBufLength(GetKeyBufLength()+1);
        if (i-WORDSIZE == INPUT_BUFFER_LEN-1) break;
    }

    ! (3) we fill up the buffer with spaces, which is unnecessary, but may
    !     help incorrectly-written interpreters to cope.

    #Ifdef TARGET_ZCODE;
    for (: i<INPUT_BUFFER_LEN : i++) buffer->i = ' ';
    #Endif; ! TARGET_ZCODE

    return REPARSE_CODE;

]; ! end of NounDomain


[ AskPlayer context  i j k l first_word answer_words marker;
    ! Now we print up the question, using the equivalence classes as worked
    ! out by Adjudicate() so as not to repeat ourselves on plural objects...

    asking_player = true;
    if (context == CREATURE_TOKEN) L__M(##Miscellany, 45);
    else                           L__M(##Miscellany, 46);

    j = number_of_classes; marker = 0;
    for (i=1 : i<=number_of_classes : i++) {
        while (((match_classes-->marker) ~= i) && ((match_classes-->marker) ~= -i)) marker++;
        k = match_list-->marker;

        if (match_classes-->marker > 0) print (the) k; else print (a) k;

        if (i < j-1)  print (string) COMMA__TX;
        if (i == j-1) print (SerialComma) j, (string) OR__TX;
    }
    L__M(##Miscellany, 57);

    ! ...and get an answer:

  .WhichOne;
    #Ifdef TARGET_ZCODE;
    for (i=WORDSIZE : i<INPUT_BUFFER_LEN : i++) buffer2->i = ' ';
    #Endif; ! TARGET_ZCODE
    answer_words = Keyboard(buffer2, parse2);

    first_word = WordValue(1, parse2);
    asking_player = false;

    ! Take care of "all", because that does something too clever here to do
    ! later on:

    if (first_word == ALL1__WD or ALL2__WD or ALL3__WD or ALL4__WD or ALL5__WD) {
        if (context == MULTI_TOKEN or MULTIHELD_TOKEN or MULTIEXCEPT_TOKEN or MULTIINSIDE_TOKEN) {
            l = multiple_object-->0;
            for (i=0 : i<number_matched && l+i<63 : i++) {
                k = match_list-->i;
                multiple_object-->(i+1+l) = k;
            }
            multiple_object-->0 = i+l;
            rtrue;
        }
        L__M(##Miscellany, 47);
        jump WhichOne;
    }

    ! If the first word of the reply can be interpreted as a verb, then
    ! assume that the player has ignored the question and given a new
    ! command altogether.
    ! (This is one time when it's convenient that the directions are
    ! not themselves verbs - thus, "north" as a reply to "Which, the north
    ! or south door" is not treated as a fresh command but as an answer.)

    #Ifdef LanguageIsVerb;
    if (first_word == 0) {
        j = wn; first_word = LanguageIsVerb(buffer2, parse2, 1); wn = j;
    }
    #Endif; ! LanguageIsVerb
    if (first_word) {
        if (((first_word->#dict_par1) & DICT_VERB) && ~~LanguageVerbMayBeName(first_word)) {
            CopyBuffer(buffer, buffer2);
            return REPARSE_CODE;
        }
        if (NumberWords(parse2) > 2) {
            j = WordValue(2, parse2);
            k = WordValue(3, parse2);
            if (j == ',//' && k && (k->#dict_par1) & DICT_VERB) {
                CopyBuffer(buffer, buffer2);
                return REPARSE_CODE;
            }
        }
    }

    ! Now we insert the answer into the original typed command, as
    ! words additionally describing the same object
    ! (eg, > take red button
    !      Which one, ...
    !      > music
    ! becomes "take music red button".  The parser will thus have three
    ! words to work from next time, not two.)

    k = WordAddress(match_from) - buffer;
    l = GetKeyBufLength(buffer2) +1;
    for (j=buffer + INPUT_BUFFER_LEN - 1 : j>=buffer+k+l : j--) j->0 = j->(-l);
    for (i=0 : i<l : i++) buffer->(k+i) = buffer2->(WORDSIZE+i);
    buffer->(k+l-1) = ' ';
    SetKeyBufLength(GetKeyBufLength() + l);

    ! Having reconstructed the input, we warn the parser accordingly
    ! and get out.

    return REPARSE_CODE;
];


! ----------------------------------------------------------------------------
!  The Adjudicate routine tries to see if there is an obvious choice, when
!  faced with a list of objects (the match_list) each of which matches the
!  player's specification equally well.
!
!  To do this it makes use of the context (the token type being worked on).
!  It counts up the number of obvious choices for the given context
!  (all to do with where a candidate is, except for 6 (animate) which is to
!  do with whether it is animate or not);
!
!  if only one obvious choice is found, that is returned;
!
!  if we are in indefinite mode (don't care which) one of the obvious choices
!    is returned, or if there is no obvious choice then an unobvious one is
!    made;
!
!  at this stage, we work out whether the objects are distinguishable from
!    each other or not: if they are all indistinguishable from each other,
!    then choose one, it doesn't matter which;
!
!  otherwise, 0 (meaning, unable to decide) is returned (but remember that
!    the equivalence classes we've just worked out will be needed by other
!    routines to clear up this mess, so we can't economise on working them
!    out).
!
!  Returns -1 if an error occurred
! ----------------------------------------------------------------------------

Constant SCORE__CHOOSEOBJ   = 1000;
Constant SCORE__IFGOOD      = 500;
Constant SCORE__UNCONCEALED = 100;
Constant SCORE__BESTLOC     = 60;
Constant SCORE__NEXTBESTLOC = 40;
Constant SCORE__NOTCOMPASS  = 20;
Constant SCORE__NOTSCENERY  = 10;
Constant SCORE__NOTACTOR    = 5;
Constant SCORE__GNA         = 1;
Constant SCORE__DIVISOR     = 20;

[ Adjudicate context i j k good_flag good_ones last n flag offset sovert;
    #Ifdef DEBUG;
    if (parser_trace >= 4) {
        print "   [Adjudicating match list of size ", number_matched, " in context ", context, "]^";
        print "   ";
        if (indef_mode) {
            print "indefinite type: ";
            if (indef_type & OTHER_BIT)  print "other ";
            if (indef_type & MY_BIT)     print "my ";
            if (indef_type & THAT_BIT)   print "that ";
            if (indef_type & PLURAL_BIT) print "plural ";
            if (indef_type & LIT_BIT)    print "lit ";
            if (indef_type & UNLIT_BIT)  print "unlit ";
            if (indef_owner ~= 0) print "owner:", (name) indef_owner;
            new_line;
            print "   number wanted: ";
            if (indef_wanted == 100) print "all"; else print indef_wanted;
            new_line;
            print "   most likely GNAs of names: ", indef_cases, "^";
        }
        else print "definite object^";
    }
    #Endif; ! DEBUG

    j = number_matched-1; good_ones = 0; last = match_list-->0;
    for (i=0 : i<=j : i++) {
        n = match_list-->i;
        match_scores-->i = 0;

        good_flag = false;

        switch (context) {
          HELD_TOKEN, MULTIHELD_TOKEN:
            if (parent(n) == actor) good_flag = true;
          MULTIEXCEPT_TOKEN:
            if (advance_warning == -1) {
                good_flag = true;
            }
            else {
                if (n ~= advance_warning) good_flag = true;
            }
          MULTIINSIDE_TOKEN:
            if (advance_warning == -1) {
                if (parent(n) ~= actor) good_flag = true;
            }
            else {
                if (n in advance_warning) good_flag = true;
            }
          CREATURE_TOKEN:
            if (CreatureTest(n) == 1) good_flag = true;
          default:
            good_flag = true;
        }

        if (good_flag) {
            match_scores-->i = SCORE__IFGOOD;
            good_ones++; last = n;
        }
    }
    if (good_ones == 1) return last;

    ! If there is ambiguity about what was typed, but it definitely wasn't
    ! animate as required, then return anything; higher up in the parser
    ! a suitable error will be given.  (This prevents a question being asked.)

    if (context == CREATURE_TOKEN && good_ones == 0) return match_list-->0;

    if (indef_mode == 0) indef_type=0;

    ScoreMatchL(context);
    if (number_matched == 0) return -1;

    if (indef_mode == 1 && indef_type & PLURAL_BIT ~= 0) {
        if (context ~= MULTI_TOKEN or MULTIHELD_TOKEN or MULTIEXCEPT_TOKEN
                     or MULTIINSIDE_TOKEN) {
            etype = MULTI_PE;
            return -1;
        }
        i = 0; offset = multiple_object-->0; sovert = -1;
        for (j=BestGuess() : j~=-1 && i<indef_wanted && i+offset<63 : j=BestGuess()) {
            flag = 1;
            if (j has concealed or worn) flag = 0;
            if (sovert == -1) sovert = bestguess_score/SCORE__DIVISOR;
            else {
                if (indef_wanted == 100 && bestguess_score/SCORE__DIVISOR < sovert)
                    flag = 0;
            }
            if (context == MULTIHELD_TOKEN or MULTIEXCEPT_TOKEN && parent(j) ~= actor)
                flag = 0;
            #Ifdef TRADITIONAL_TAKE_ALL;
            if (action_to_be == ##Take or ##Remove && parent(j) == actor)
                flag = 0;
            #Ifnot;
            if (action_to_be == ##Take or ##Remove &&
               (j has animate or scenery or static || parent(j) == actor))
                flag = 0;
            #Endif; ! TRADITIONAL_TAKE_ALL
            #Ifdef NO_TAKE_ALL;
            if (take_all_rule == 2 && match_length == 0) flag = 0;
            #Endif; ! NO_TAKE_ALL
            n = ChooseObjects(j, flag);
            if (n == 0) n = LibraryExtensions.RunWhile(ext_chooseobjects, 0, j, flag);
            switch (n) {
              2: flag = 0;  ! forcing rejection
              1: flag = 1;  ! forcing acceptance
             !0:            ! going with parser's decision
            }
            if (flag == 1) {
                i++; multiple_object-->(i+offset) = j;
                #Ifdef DEBUG;
                if (parser_trace >= 4) print "   Accepting it^";
                #Endif; ! DEBUG
            }
            else {
                i = i;
                #Ifdef DEBUG;
                if (parser_trace >= 4) print "   Rejecting it^";
                #Endif; ! DEBUG
            }
        }
        if (i < indef_wanted && indef_wanted < 100) {
            etype = TOOFEW_PE; multi_wanted = indef_wanted;
            multi_had=i;
            return -1;
        }
        multiple_object-->0 = i+offset;
        multi_context = context;
        #Ifdef DEBUG;
        if (parser_trace >= 4)
            print "   Made multiple object of size ", i, "]^";
        #Endif; ! DEBUG
        return 1;
    }

    for (i=0 : i<number_matched : i++) match_classes-->i = 0;

    n = 1;
    for (i=0 : i<number_matched : i++)
        if (match_classes-->i == 0) {
            match_classes-->i = n++; flag = 0;
            for (j=i+1 : j<number_matched : j++)
                if (match_classes-->j == 0 && Identical(match_list-->i, match_list-->j) == 1) {
                    flag=1;
                    match_classes-->j = match_classes-->i;
                }
            if (flag == 1) match_classes-->i = 1-n;
        }
     n--; number_of_classes = n;

    #Ifdef DEBUG;
    if (parser_trace >= 4) {
        print "   Grouped into ", n, " possibilities by name:^";
        for (i=0 : i<number_matched : i++)
            if (match_classes-->i > 0)
                print "   ", (The) match_list-->i, " (", match_list-->i, ")  ---  group ",
                  match_classes-->i, "^";
    }
    #Endif; ! DEBUG
    if (n == 1) dont_infer = true;

    if (indef_mode == 0) {
        !  Is there now a single highest-scoring object?
        i = SingleBestGuess();
        if (i >= 0) {

            #Ifdef DEBUG;
            if (parser_trace >= 4) print "   Single best-scoring object returned.]^";
            #Endif; ! DEBUG
            return i;
        }
    }

    if (indef_mode == 0) {
        if (n > 1) {
            k = -1;
            for (i=0 : i<number_matched : i++) {
                if (match_scores-->i > k) {
                    k = match_scores-->i;
                    j = match_classes-->i; j = j*j;
                    flag = 0;
                }
                else
                    if (match_scores-->i == k) {
                        if ((match_classes-->i) * (match_classes-->i) ~= j)
                            flag = 1;
                    }
            }

        if (flag) {
            #Ifdef DEBUG;
            if (parser_trace >= 4) print "   Unable to choose best group, so ask player.]^";
            #Endif; ! DEBUG
            return 0;
        }
        #Ifdef DEBUG;
        if (parser_trace >= 4) print "   Best choices are all from the same group.^";
        #Endif; ! DEBUG
        }
    }

    !  When the player is really vague, or there's a single collection of
    !  indistinguishable objects to choose from, choose the one the player
    !  most recently acquired, or if the player has none of them, then
    !  the one most recently put where it is.

    return BestGuess();

]; ! Adjudicate

! ----------------------------------------------------------------------------
!  ReviseMulti  revises the multiple object which already exists, in the
!    light of information which has come along since then (i.e., the second
!    parameter).  It returns a parser error number, or else 0 if all is well.
!    This only ever throws things out, never adds new ones.
! ----------------------------------------------------------------------------

[ ReviseMulti second_p  i low;
    #Ifdef DEBUG;
    if (parser_trace >= 4) print "   Revising multiple object list of size ", multiple_object-->0,
      " with 2nd ", (name) second_p, "^";
    #Endif; ! DEBUG

    if (multi_context == MULTIEXCEPT_TOKEN or MULTIINSIDE_TOKEN) {
        for (i=1,low=0 : i<=multiple_object-->0 : i++) {
            if ( (multi_context==MULTIEXCEPT_TOKEN && multiple_object-->i ~= second_p) ||
                 (multi_context==MULTIINSIDE_TOKEN && multiple_object-->i in second_p)) {
                low++;
                multiple_object-->low = multiple_object-->i;
            }
        }
        multiple_object-->0 = low;
    }

    if (multi_context == MULTI_TOKEN && action_to_be == ##Take) {
        for (i=1,low=0 : i<=multiple_object-->0 : i++)
            if (ScopeCeiling(multiple_object-->i)==ScopeCeiling(actor)) low++;
        #Ifdef DEBUG;
        if (parser_trace >= 4) print "   Token 2 plural case: number with actor ", low, "^";
        #Endif; ! DEBUG
        if (take_all_rule == 2 || low > 0) {
            for (i=1,low=0 : i<=multiple_object-->0 : i++) {
                if (ScopeCeiling(multiple_object-->i) == ScopeCeiling(actor)) {
                    low++;
                    multiple_object-->low = multiple_object-->i;
                }
            }
            multiple_object-->0 = low;
        }
    }

    i = multiple_object-->0;
    #Ifdef DEBUG;
    if (parser_trace >= 4) print "   Done: new size ", i, "^";
    #Endif; ! DEBUG
    if (i == 0) return NOTHING_PE;
    return 0;
];

! ----------------------------------------------------------------------------
!  ScoreMatchL  scores the match list for quality in terms of what the
!  player has vaguely asked for.  Points are awarded for conforming with
!  requirements like "my", and so on.  Remove from the match list any
!  entries which fail the basic requirements of the descriptors.
! ----------------------------------------------------------------------------

[ ScoreMatchL context its_owner its_score obj i j threshold met a_s l_s;
!   if (indef_type & OTHER_BIT ~= 0) threshold++;
    if (indef_type & MY_BIT ~= 0)    threshold++;
    if (indef_type & THAT_BIT ~= 0)  threshold++;
    if (indef_type & LIT_BIT ~= 0)   threshold++;
    if (indef_type & UNLIT_BIT ~= 0) threshold++;
    if (indef_owner ~= nothing)      threshold++;

    #Ifdef DEBUG;
    if (parser_trace >= 4) print "   Scoring match list: indef mode ", indef_mode, " type ",
      indef_type, ", satisfying ", threshold, " requirements:^";
    #Endif; ! DEBUG

    if (action_to_be ~= ##Take)
        a_s = SCORE__NEXTBESTLOC;
    l_s = SCORE__BESTLOC;
    if (context == HELD_TOKEN or MULTIHELD_TOKEN or MULTIEXCEPT_TOKEN) {
        a_s = SCORE__BESTLOC; l_s = SCORE__NEXTBESTLOC;
    }

    for (i=0 : i<number_matched : i++) {
        obj = match_list-->i; its_owner = parent(obj); its_score=0; met=0;

        !      if (indef_type & OTHER_BIT ~= 0
        !          &&  obj ~= itobj or himobj or herobj) met++;
        if (indef_type & MY_BIT ~= 0 && its_owner == actor) met++;
        if (indef_type & THAT_BIT ~= 0 && its_owner == actors_location) met++;
        if (indef_type & LIT_BIT ~= 0 && obj has light) met++;
        if (indef_type & UNLIT_BIT ~= 0 && obj hasnt light) met++;
        if (indef_owner ~= 0 && its_owner == indef_owner) met++;

        if (met < threshold) {
            #Ifdef DEBUG;
            if (parser_trace >= 4) print "   ", (The) match_list-->i, " (", match_list-->i, ") in ",
              (the) its_owner, " is rejected (doesn't match descriptors)^";
            #Endif; ! DEBUG
            match_list-->i = -1;
        }
        else {
            its_score = 0;
            if (obj hasnt concealed) its_score = SCORE__UNCONCEALED;

            if (its_owner == actor) its_score = its_score + a_s;
            else
                if (its_owner == actors_location) its_score = its_score + l_s;
                else {
                    #Ifdef TRADITIONAL_TAKE_ALL;
                    if (its_owner ~= Compass) its_score = its_score + SCORE__NOTCOMPASS;
                    #Ifnot;
                    if (its_owner ~= Compass)
                        if (take_all_rule && its_owner &&
                            its_owner has static or scenery &&
                              (its_owner has supporter ||
                              (its_owner has container && its_owner has open)))
                            its_score = its_score + l_s;
                    else
                            its_score = its_score + SCORE__NOTCOMPASS;
                    #Endif; ! TRADITIONAL_TAKE_ALL
                }
            j = ChooseObjects(obj, 2);
            if (j == 0) j = LibraryExtensions.RunAll(ext_chooseobjects, obj, 2);
            its_score = its_score + SCORE__CHOOSEOBJ * j;

            if (obj hasnt scenery) its_score = its_score + SCORE__NOTSCENERY;
            if (obj ~= actor) its_score = its_score + SCORE__NOTACTOR;

            !   A small bonus for having the correct GNA,
            !   for sorting out ambiguous articles and the like.

            if (indef_cases & (PowersOfTwo_TB-->(GetGNAOfObject(obj))))
                its_score = its_score + SCORE__GNA;

            match_scores-->i = match_scores-->i + its_score;
            #Ifdef DEBUG;
            if (parser_trace >= 4) print "     ", (The) match_list-->i, " (", match_list-->i,
              ") in ", (the) its_owner, " : ", match_scores-->i, " points^";
            #Endif; ! DEBUG
        }
     }

    for (i=0 : i<number_matched : i++) {
        while (match_list-->i == -1) {
            if (i == number_matched-1) { number_matched--; break; }
            for (j=i : j<number_matched-1 : j++) {
                match_list-->j = match_list-->(j+1);
                match_scores-->j = match_scores-->(j+1);
            }
            number_matched--;
        }
    }
];

! ----------------------------------------------------------------------------
!  BestGuess makes the best guess it can out of the match list, assuming that
!  everything in the match list is textually as good as everything else;
!  however it ignores items marked as -1, and so marks anything it chooses.
!  It returns -1 if there are no possible choices.
! ----------------------------------------------------------------------------

[ BestGuess  earliest its_score best i;
    earliest = 0; best = -1;
    for (i=0 : i<number_matched : i++) {
        if (match_list-->i >= 0) {
            its_score = match_scores-->i;
            if (its_score > best) { best = its_score; earliest = i; }
        }
    }
    #Ifdef DEBUG;
    if (parser_trace >= 4)
      if (best < 0) print "   Best guess ran out of choices^";
      else print "   Best guess ", (the) match_list-->earliest, " (", match_list-->earliest, ")^";
    #Endif; ! DEBUG
    if (best < 0) return -1;
    i = match_list-->earliest;
    match_list-->earliest = -1;
    bestguess_score = best;
    return i;
];

! ----------------------------------------------------------------------------
!  SingleBestGuess returns the highest-scoring object in the match list
!  if it is the clear winner, or returns -1 if there is no clear winner
! ----------------------------------------------------------------------------

[ SingleBestGuess  earliest its_score best i;
    earliest = -1; best = -1000;
    for (i=0 : i<number_matched : i++) {
        its_score = match_scores-->i;
        if (its_score == best) earliest = -1;
        if (its_score > best) { best = its_score; earliest = match_list-->i; }
    }
    bestguess_score = best;
    return earliest;
];

! ----------------------------------------------------------------------------
!  Identical decides whether or not two objects can be distinguished from
!  each other by anything the player can type.  If not, it returns true.
! ----------------------------------------------------------------------------

[ Identical o1 o2 p1 p2 n1 n2 i j flag;
    if (o1 == o2) rtrue;  ! This should never happen, but to be on the safe side
    if (o1 == 0 || o2 == 0) rfalse;  ! Similarly
    if (parent(o1) == Compass || parent(o2) == Compass) rfalse; ! Saves time

    !  What complicates things is that o1 or o2 might have a parsing routine,
    !  so the parser can't know from here whether they are or aren't the same.
    !  If they have different parsing routines, we simply assume they're
    !  different.  If they have the same routine (which they probably got from
    !  a class definition) then the decision process is as follows:
    !
    !     the routine is called (with self being o1, not that it matters)
    !       with noun and second being set to o1 and o2, and action being set
    !       to the fake action TheSame.  If it returns -1, they are found
    !       identical; if -2, different; and if >=0, then the usual method
    !       is used instead.

    if (o1.parse_name ~= 0 || o2.parse_name ~= 0) {
      if (o1.parse_name ~= o2.parse_name) rfalse;
      parser_action = ##TheSame; parser_one = o1; parser_two = o2;
      j = wn; i = RunRoutines(o1,parse_name); wn = j;
      if (i == -1) rtrue;
      if (i == -2) rfalse;
    }

    !  This is the default algorithm: do they have the same words in their
    !  "name" (i.e. property no. 1) properties.  (Note that the following allows
    !  for repeated words and words in different orders.)

    p1 = o1.&1; n1 = (o1.#1)/WORDSIZE;
    p2 = o2.&1; n2 = (o2.#1)/WORDSIZE;

    !  for (i=0 : i<n1 : i++) { print (address) p1-->i, " "; } new_line;
    !  for (i=0 : i<n2 : i++) { print (address) p2-->i, " "; } new_line;

    for (i=0 : i<n1 : i++) {
        flag = 0;
        for (j=0 : j<n2 : j++)
            if (p1-->i == p2-->j) flag = 1;
        if (flag == 0) rfalse;
    }

    for (j=0 : j<n2 : j++) {
        flag = 0;
        for (i=0 : i<n1 : i++)
            if (p1-->i == p2-->j) flag = 1;
        if (flag == 0) rfalse;
    }

    !  print "Which are identical!^";
    rtrue;
];

! ----------------------------------------------------------------------------
!  PrintCommand reconstructs the command as it presently reads, from
!  the pattern which has been built up
!
!  If from is 0, it starts with the verb: then it goes through the pattern.
!  The other parameter is "emptyf" - a flag: if 0, it goes up to pcount:
!  if 1, it goes up to pcount-1.
!
!  Note that verbs and prepositions are printed out of the dictionary:
!  and that since the dictionary may only preserve the first six characters
!  of a word (in a V3 game), we have to hand-code the longer words needed.
!
!  (Recall that pattern entries are 0 for "multiple object", 1 for "special
!  word", 2 to REPARSE_CODE-1 are object numbers and REPARSE_CODE+n means the
!  preposition n)
! ----------------------------------------------------------------------------

[ PrintCommand from i k spacing_flag;
    #Ifdef LanguageCommand;
    LanguageCommand(from);
    i = k = spacing_flag = 0;   ! suppress warning
    #Ifnot;
    if (from == 0) {
        i = verb_word;
        if (LanguageVerb(i) == 0 && PrintVerb(i) == false && LibraryExtensions.RunWhile(ext_printverb, false, i) == 0)
            print (address) i;
        from++; spacing_flag = true;
    }

    for (k=from : k<pcount : k++) {
        i = pattern-->k;
        if (i == PATTERN_NULL) continue;
        if (spacing_flag) print (char) ' ';
        if (i == 0) { print (string) THOSET__TX; jump TokenPrinted; }
        if (i == 1) { print (string) THAT__TX;   jump TokenPrinted; }
        if (i >= REPARSE_CODE)
            print (address) No__Dword(i-REPARSE_CODE);
        else
            if (i in Compass && LanguageVerbLikesAdverb(verb_word))
                LanguageDirection (i.door_dir); ! the direction name as adverb
            else
                print (the) i;
      .TokenPrinted;
        spacing_flag = true;
    }
    #Endif; ! LanguageCommand
];

! ----------------------------------------------------------------------------
!  The CantSee routine returns a good error number for the situation where
!  the last word looked at didn't seem to refer to any object in context.
!
!  The idea is that: if the actor is in a location (but not inside something
!  like, for instance, a tank which is in that location) then an attempt to
!  refer to one of the words listed as meaningful-but-irrelevant there
!  will cause "you don't need to refer to that in this game" rather than
!  "no such thing" or "what's 'it'?".
!  (The advantage of not having looked at "irrelevant" local nouns until now
!  is that it stops them from clogging up the ambiguity-resolving process.
!  Thus game objects always triumph over scenery.)
! ----------------------------------------------------------------------------

[ CantSee  i w e;
    if (scope_token ~= 0) {
        scope_error = scope_token;
        return ASKSCOPE_PE;
    }

    wn--; w = NextWord();
    e = CANTSEE_PE;
    if (w == pronoun_word) {
        pronoun__word = pronoun_word; pronoun__obj = pronoun_obj;
        e = ITGONE_PE;
    }
    i = actor; while (parent(i) ~= 0) i = parent(i);

    wn--;
    if (i has visited && Refers(i,wn) == 1) e = SCENERY_PE;
    else {
        Descriptors();  ! skip past THE etc
        if (i has visited && Refers(i,wn) == 1) e = SCENERY_PE;
    }

    if (saved_ml)
        saved_oops = num_desc + match_from + saved_ml;
    else
        saved_oops = num_desc + match_from + match_length;

    wn++;
    return e;
];

! ----------------------------------------------------------------------------
!  The MultiAdd routine adds object "o" to the multiple-object-list.
!
!  This is only allowed to hold 63 objects at most, at which point it ignores
!  any new entries (and sets a global flag so that a warning may later be
!  printed if need be).
! ----------------------------------------------------------------------------

[ MultiAdd o i j;
    i = multiple_object-->0;
    if (i == 63) { toomany_flag = 1; rtrue; }
    for (j=1 : j<=i : j++)
        if (o == multiple_object-->j) rtrue;
    i++;
    multiple_object-->i = o;
    multiple_object-->0 = i;
];

! ----------------------------------------------------------------------------
!  The MultiSub routine deletes object "o" from the multiple-object-list.
!
!  It returns 0 if the object was there in the first place, and 9 (because
!  this is the appropriate error number in Parser()) if it wasn't.
! ----------------------------------------------------------------------------

[ MultiSub o i j k et;
    i = multiple_object-->0; et = 0;
    for (j=1 : j<=i : j++)
        if (o == multiple_object-->j) {
            for (k=j : k<=i : k++)
                multiple_object-->k = multiple_object-->(k+1);
            multiple_object-->0 = --i;
            return et;
        }
    et = 9; return et;
];

! ----------------------------------------------------------------------------
!  The MultiFilter routine goes through the multiple-object-list and throws
!  out anything without the given attribute "attr" set.
! ----------------------------------------------------------------------------

[ MultiFilter attr  i j o;

  .MFiltl;

    i = multiple_object-->0;
    for (j=1 : j<=i : j++) {
        o = multiple_object-->j;
        if (o hasnt attr) {
            MultiSub(o);
            jump Mfiltl;
        }
    }
];

! ----------------------------------------------------------------------------
!  The UserFilter routine consults the user's filter (or checks on attribute)
!  to see what already-accepted nouns are acceptable
! ----------------------------------------------------------------------------

[ UserFilter obj;
    if (token_filter > 0 && token_filter < 49) {
        if (obj has (token_filter-1)) rtrue;
        rfalse;
    }
    noun = obj;
    return token_filter();
];

! ----------------------------------------------------------------------------
!  MoveWord copies word at2 from parse buffer b2 to word at1 in "parse"
!  (the main parse buffer)
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ MoveWord at1 b2 at2 x y;
    x = at1*2-1; y = at2*2-1;
    parse-->x++ = b2-->y++;
    parse-->x = b2-->y;
];

#Ifnot; ! TARGET_GLULX

[ MoveWord at1 b2 at2 x y;
    x = at1*3-2; y = at2*3-2;
    parse-->x++ = b2-->y++;
    parse-->x++ = b2-->y++;
    parse-->x = b2-->y;
];

#Endif; ! TARGET_

! ----------------------------------------------------------------------------
!  SearchScope  domain1 domain2 context
!
!  Works out what objects are in scope (possibly asking an outside routine),
!  but does not look at anything the player has typed.
! ----------------------------------------------------------------------------

[ SearchScope domain1 domain2 context i is;
    i = 0;
    !  Everything is in scope to the debugging commands

    #Ifdef DEBUG;
    if (scope_reason == PARSING_REASON
        && LanguageVerbIsDebugging(verb_word)) {

        #Ifdef TARGET_ZCODE;
        for (i=selfobj : i<=top_object : i++)
            if (i ofclass Object && (parent(i) == 0 || parent(i) ofclass Object))
                PlaceInScope(i);
        #Ifnot; ! TARGET_GLULX
        objectloop (i)
            if (i ofclass Object && (parent(i) == 0 || parent(i) ofclass Object))
                PlaceInScope(i);
        #Endif; ! TARGET_
        rtrue;
    }
    #Endif; ! DEBUG

    ! First, a scope token gets priority here:

    if (scope_token ~= 0) {
        scope_stage = 2;
        if (scope_token()) rtrue;
    }

    ! Pick up everything in the location except the actor's possessions;
    ! then go through those.  (This ensures the actor's possessions are in
    ! scope even in Darkness.)

    if (context == MULTIINSIDE_TOKEN && advance_warning ~= -1) {
        if (IsSeeThrough(advance_warning) == 1)
           ScopeWithin(advance_warning, 0, context);
    }
    else {
        ! Next, call any user-supplied routine adding things to the scope,
        ! which may circumvent the usual routines altogether
        ! if they return true:

        if (actor == domain1 or domain2) {
            is = InScope(actor);
            if (is == false) is = LibraryExtensions.RunWhile(ext_inscope, false, actor);
            if (is) rtrue;
        }

        if (domain1 ~= 0 && domain1 has supporter or container)
            ScopeWithin_O(domain1, domain1, context);
        ScopeWithin(domain1, domain2, context);
        if (domain2 ~= 0 && domain2 has supporter or container)
            ScopeWithin_O(domain2, domain2, context);
        ScopeWithin(domain2, 0, context);
    }

    ! A special rule applies:
    ! in Darkness as in light, the actor is always in scope to himself.

    if (thedark == domain1 or domain2) {
        ScopeWithin_O(actor, actor, context);
        if (parent(actor) has supporter or container)
            ScopeWithin_O(parent(actor), parent(actor), context);
    }
];

! ----------------------------------------------------------------------------
!  IsSeeThrough is used at various places: roughly speaking, it determines
!  whether o being in scope means that the contents of o are in scope.
! ----------------------------------------------------------------------------

[ IsSeeThrough o;
    if (o has supporter or transparent ||
       (o has container && o has open))
        rtrue;
    rfalse;
];

! ----------------------------------------------------------------------------
!  PlaceInScope is provided for routines outside the library, and is not
!  called within the parser (except for debugging purposes).
! ----------------------------------------------------------------------------

[ PlaceInScope thing;
    if (scope_reason~=PARSING_REASON or TALKING_REASON) {
        DoScopeAction(thing); rtrue;
    }
    wn = match_from; TryGivenObject(thing); placed_in_flag = 1;
];

! ----------------------------------------------------------------------------
!  DoScopeAction
! ----------------------------------------------------------------------------

[ DoScopeAction thing s p1;
    s = scope_reason; p1 = parser_one;
    #Ifdef DEBUG;
    if (parser_trace >= 6)
        print "[DSA on ", (the) thing, " with reason = ", scope_reason,
            " p1 = ", parser_one, " p2 = ", parser_two, "]^";
    #Endif; ! DEBUG
    switch (scope_reason) {
      REACT_BEFORE_REASON:
        if (thing.react_before == 0 or NULL) return;
        #Ifdef DEBUG;
        if (parser_trace >= 2)
              print "[Considering react_before for ", (the) thing, "]^";
        #Endif; ! DEBUG
        if (parser_one == 0) parser_one = RunRoutines(thing, react_before);
      REACT_AFTER_REASON:
        if (thing.react_after == 0 or NULL) return;
        #Ifdef DEBUG;
        if (parser_trace >= 2)
            print "[Considering react_after for ", (the) thing, "]^";
        #Endif; ! DEBUG
        if (parser_one == 0) parser_one = RunRoutines(thing, react_after);
      EACH_TURN_REASON:
        if (thing.each_turn == 0) return;
        #Ifdef DEBUG;
        if (parser_trace >= 2)
              print "[Considering each_turn for ", (the) thing, "]^";
        #Endif; ! DEBUG
        PrintOrRun(thing, each_turn);
      TESTSCOPE_REASON:
        if (thing == parser_one) parser_two = 1;
      LOOPOVERSCOPE_REASON:
        parser_one(thing);
        parser_one=p1;
    }
    scope_reason = s;
];

! ----------------------------------------------------------------------------
!  ScopeWithin looks for objects in the domain which make textual sense
!  and puts them in the match list.  (However, it does not recurse through
!  the second argument.)
! ----------------------------------------------------------------------------

[ ScopeWithin domain nosearch context x y;
    if (domain == 0) rtrue;

    ! Special rule: the directions (interpreted as the 12 walls of a room) are
    ! always in context.  (So, e.g., "examine north wall" is always legal.)
    ! (Unless we're parsing something like "all", because it would just slow
    ! things down then, or unless the context is "creature".)

    if (indef_mode==0 && domain==actors_location
        && scope_reason==PARSING_REASON && context~=CREATURE_TOKEN)
            ScopeWithin(Compass);

    ! Look through the objects in the domain, avoiding "objectloop" in case
    ! movements occur, e.g. when trying each_turn.

    x = child(domain);
    while (x ~= 0) {
        y = sibling(x);
        ScopeWithin_O(x, nosearch, context);
        x = y;
    }
];

[ ScopeWithin_O domain nosearch context i ad n;

    ! If the scope reason is unusual, don't parse.

    if (scope_reason ~= PARSING_REASON or TALKING_REASON) {
        DoScopeAction(domain);
        jump DontAccept;
    }

    ! "it" or "them" matches to the it-object only.  (Note that (1) this means
    ! that "it" will only be understood if the object in question is still
    ! in context, and (2) only one match can ever be made in this case.)

    if (match_from <= num_words) {  ! If there's any text to match, that is
        wn = match_from;
        i = NounWord();
        if (i == 1 && player == domain) MakeMatch(domain, 1);
        if (i >= 2 && i < 128 && (LanguagePronouns-->i == domain)) MakeMatch(domain, 1);
    }

    ! Construing the current word as the start of a noun, can it refer to the
    ! object?

    wn = match_from;
    if (TryGivenObject(domain) > 0)
        if (indef_nspec_at > 0 && match_from ~= indef_nspec_at) {
            ! This case arises if the player has typed a number in
            ! which is hypothetically an indefinite descriptor:
            ! e.g. "take two clubs".  We have just checked the object
            ! against the word "clubs", in the hope of eventually finding
            ! two such objects.  But we also backtrack and check it
            ! against the words "two clubs", in case it turns out to
            ! be the 2 of Clubs from a pack of cards, say.  If it does
            ! match against "two clubs", we tear up our original
            ! assumption about the meaning of "two" and lapse back into
            ! definite mode.

            wn = indef_nspec_at;
            if (TryGivenObject(domain) > 0) {
                match_from = indef_nspec_at;
                ResetDescriptors();
            }
            wn = match_from;
        }

  .DontAccept;

    ! Shall we consider the possessions of the current object, as well?
    ! Only if it's a container (so, for instance, if a dwarf carries a
    ! sword, then "drop sword" will not be accepted, but "dwarf, drop sword"
    ! will).
    ! Also, only if there are such possessions.
    !
    ! Notice that the parser can see "into" anything flagged as
    ! transparent - such as a dwarf whose sword you can get at.

    if (child(domain) ~= 0 && domain ~= nosearch && IsSeeThrough(domain) == 1)
        ScopeWithin(domain,nosearch,context);

    ! Drag any extras into context

    ad = domain.&add_to_scope;
    if (ad ~= 0) {

        ! Test if the property value is not an object.
        #Ifdef TARGET_ZCODE;
        i = (UnsignedCompare(ad-->0, top_object) > 0);
        #Ifnot; ! TARGET_GLULX
        i = (((ad-->0)->0) ~= $70);
        #Endif; ! TARGET_

        if (i) {
            ats_flag = 2+context;
            RunRoutines(domain, add_to_scope);
            ats_flag = 0;
        }
        else {
            n = domain.#add_to_scope;
            for (i=0 : (WORDSIZE*i)<n : i++)
                if (ad-->i)
                    ScopeWithin_O(ad-->i, 0, context);
        }
    }
];

[ AddToScope obj;
    if (ats_flag >= 2)
        ScopeWithin_O(obj, 0, ats_flag-2);
    if (ats_flag == 1) {
        if  (HasLightSource(obj)==1) ats_hls = 1;
    }
];

! ----------------------------------------------------------------------------
!  MakeMatch looks at how good a match is.  If it's the best so far, then
!  wipe out all the previous matches and start a new list with this one.
!  If it's only as good as the best so far, add it to the list.
!  If it's worse, ignore it altogether.
!
!  The idea is that "red panic button" is better than "red button" or "panic".
!
!  number_matched (the number of words matched) is set to the current level
!  of quality.
!
!  We never match anything twice, and keep at most 64 equally good items.
! ----------------------------------------------------------------------------

[ MakeMatch obj quality i;
    #Ifdef DEBUG;
    if (parser_trace >= 6) print "    Match with quality ",quality,"^";
    #Endif; ! DEBUG
    if (token_filter ~= 0 && UserFilter(obj) == 0) {
        #Ifdef DEBUG;
        if (parser_trace >= 6) print "    Match filtered out: token filter ", token_filter, "^";
        #Endif; ! DEBUG
        rtrue;
    }
    if (quality < match_length) rtrue;
    if (quality > match_length) { match_length = quality; number_matched = 0; }
    else {
        if (number_matched >= MATCH_LIST_SIZE) rtrue;
        for (i=0 : i<number_matched : i++)
            if (match_list-->i == obj) rtrue;
    }
    match_list-->number_matched++ = obj;
    #Ifdef DEBUG;
    if (parser_trace >= 6) print "    Match added to list^";
    #Endif; ! DEBUG
];

! ----------------------------------------------------------------------------
!  TryGivenObject tries to match as many words as possible in what has been
!  typed to the given object, obj.  If it manages any words matched at all,
!  it calls MakeMatch to say so, then returns the number of words (or 1
!  if it was a match because of inadequate input).
! ----------------------------------------------------------------------------

[ TryGivenObject obj threshold k w j;
    #Ifdef DEBUG;
    if (parser_trace >= 5) print "    Trying ", (the) obj, " (", obj, ") at word ", wn, "^";
    #Endif; ! DEBUG

    dict_flags_of_noun = 0;

    !  If input has run out then always match, with only quality 0 (this saves
    !  time).

    if (wn > num_words) {
        if (indef_mode ~= 0)
            dict_flags_of_noun = DICT_X654;  ! Reject "plural" bit
        MakeMatch(obj,0);
        #Ifdef DEBUG;
        if (parser_trace >= 5) print "    Matched (0)^";
        #Endif; ! DEBUG
        return 1;
    }

    !  Ask the object to parse itself if necessary, sitting up and taking notice
    !  if it says the plural was used:

    if (obj.parse_name~=0) {
        parser_action = NULL; j=wn;
        k = RunRoutines(obj,parse_name);
        if (k > 0) {
            wn=j+k;

          .MMbyPN;

            if (parser_action == ##PluralFound)
                dict_flags_of_noun = dict_flags_of_noun | DICT_PLUR;

            if (dict_flags_of_noun & DICT_PLUR) {
                if (~~allow_plurals) k = 0;
                else {
                    if (indef_mode == 0) {
                        indef_mode = 1; indef_type = 0; indef_wanted = 0;
                    }
                    indef_type = indef_type | PLURAL_BIT;
                    if (indef_wanted == 0) indef_wanted = 100;
                }
            }

            #Ifdef DEBUG;
            if (parser_trace >= 5) print "    Matched (", k, ")^";
            #Endif; ! DEBUG
            MakeMatch(obj,k);
            return k;
        }
        if (k == 0) jump NoWordsMatch;
        wn = j;
    }

    ! The default algorithm is simply to count up how many words pass the
    ! Refers test:

    parser_action = NULL;

    w = NounWord();

    if (w == 1 && player == obj) { k=1; jump MMbyPN; }

    if (w >= 2 && w < 128 && (LanguagePronouns-->w == obj)) { k = 1; jump MMbyPN; }

    j = --wn;
    threshold = ParseNoun(obj);
    if (threshold == -1) {
        LibraryExtensions.ext_number_1 = wn;    ! Set the "between calls" functionality to
        LibraryExtensions.BetweenCalls = LibraryExtensions.RestoreWN;
        threshold = LibraryExtensions.RunWhile(ext_parsenoun, -1, obj);
        LibraryExtensions.BetweenCalls = 0;     ! Turn off the "between calls" functionality
    }
    #Ifdef DEBUG;
    if (threshold >= 0 && parser_trace >= 5) print "    ParseNoun returned ", threshold, "^";
    #Endif; ! DEBUG
    if (threshold < 0) wn++;
    if (threshold > 0) { k = threshold; jump MMbyPN; }

    if (threshold == 0 || Refers(obj,wn-1) == 0) {
      .NoWordsMatch;
        if (indef_mode ~= 0) {
            k = 0; parser_action = NULL;
            jump MMbyPN;
        }
        rfalse;
    }

    if (threshold < 0) {
        threshold = 1;
        dict_flags_of_noun = (w->#dict_par1) & (DICT_X654+DICT_PLUR);!$$01110100;
        w = NextWord();
        while (Refers(obj, wn-1)) {
            threshold++;
            if (w)
               dict_flags_of_noun = dict_flags_of_noun | ((w->#dict_par1) & (DICT_X654+DICT_PLUR));
            w = NextWord();
        }
    }

    k = threshold;
    jump MMbyPN;
];

! ----------------------------------------------------------------------------
!  Refers works out whether the word at number wnum can refer to the object
!  obj, returning true or false.  The standard method is to see if the
!  word is listed under "name" for the object, but this is more complex
!  in languages other than English.
! ----------------------------------------------------------------------------

[ Refers obj wnum   wd k l m;
    if (obj == 0 || wnum <= 0) rfalse;

    #Ifdef LanguageRefers;
    k = LanguageRefers(obj,wnum); if (k >= 0) return k;
    #Endif; ! LanguageRefers

    k = wn; wn = wnum; wd = NextWordStopped(); wn = k;

    if (parser_inflection_func) {
        k = parser_inflection(obj, wd);
        if (k >= 0) return k;
        m = -k;
    }
    else
        m = parser_inflection;

    k = obj.&m; l = (obj.#m)/WORDSIZE-1;
    for (m=0 : m<=l : m++)
        if (wd == k-->m) rtrue;
    rfalse;
];

[ WordInProperty wd obj prop k l m;
    k = obj.&prop; l = (obj.#prop)/WORDSIZE-1;
    for (m=0 : m<=l : m++)
        if (wd == k-->m) rtrue;
    rfalse;
];

[ DictionaryLookup b l i;
    for (i=0 : i<l : i++) buffer2->(WORDSIZE+i) = b->i;
    SetKeyBufLength(l, buffer2);
    Tokenise__(buffer2, parse2);
    return parse2-->1;
];

! ----------------------------------------------------------------------------
!  NounWord (which takes no arguments) returns:
!
!   0  if the next word is unrecognised or does not carry the "noun" bit in
!      its dictionary entry,
!   1  if a word meaning "me",
!   the index in the pronoun table (plus 2) of the value field of a pronoun,
!      if the word is a pronoun,
!   the address in the dictionary if it is a recognised noun.
!
!  The "current word" marker moves on one.
! ----------------------------------------------------------------------------

[ NounWord i j s;
    i = NextWord();
    if (i == 0) rfalse;
    if (i == ME1__WD or ME2__WD or ME3__WD) return 1;
    s = LanguagePronouns-->0;
    for (j=1 : j<=s : j=j+3)
        if (i == LanguagePronouns-->j)
            return j+2;
    if ((i->#dict_par1) & DICT_NOUN == 0) rfalse;
    return i;
];

! ----------------------------------------------------------------------------
!  NextWord (which takes no arguments) returns:
!
!  0            if the next word is unrecognised,
!  comma_word   if a comma
!  THEN1__WD    if a full stop
!  or the dictionary address if it is recognised.
!  The "current word" marker is moved on.
!
!  NextWordStopped does the same, but returns -1 when input has run out
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ NextWord i j;
    if (wn <= 0 || wn > parse->1) { wn++; rfalse; }
    i = wn*2-1; wn++;
    j = parse-->i;
    if (j == ',//') j = comma_word;
    if (j == './/') j = THEN1__WD;
    return j;
];

[ NextWordStopped;
    if (wn > parse->1) { wn++; return -1; }
    return NextWord();
];

[ WordAddress wordnum p b;  ! Absolute addr of 'wordnum' string in buffer
    if (p==0) p=parse;
    if (b==0) b=buffer;
    return b + p->(wordnum*4+1);
];

[ WordLength wordnum p;     ! Length of 'wordnum' string in buffer
    if (p==0) p=parse;
    return p->(wordnum*4);
];

[ WordValue wordnum p;      ! Dictionary value of 'wordnum' string in buffer
    if (p==0) p=parse;
    return p-->(wordnum*2-1);
];

[ NumberWords p;            ! Number of parsed strings in buffer
    if (p==0) p=parse;
    return p->1;
];

[ GetKeyBufLength b;        ! Number of typed chars in buffer
    if (b==0) b=buffer;
    return b->1;
];

[ SetKeyBufLength n b;      ! Update number of typed chars in buffer
    if (b==0) b=buffer;
    if (n > INPUT_BUFFER_LEN-WORDSIZE) n=INPUT_BUFFER_LEN-WORDSIZE;
    b->1 = n;
];

#Ifnot; ! TARGET_GLULX

[ NextWord i j;
    if (wn <= 0 || wn > parse-->0) { wn++; rfalse; }
    i = wn*3-2; wn++;
    j = parse-->i;
    if (j == ',//') j=comma_word;
    if (j == './/') j=THEN1__WD;
    return j;
];

[ NextWordStopped;
    if (wn > parse-->0) {
        wn++;
        return -1;
    }
    return NextWord();
];

[ WordAddress wordnum p b;  ! Absolute addr of 'wordnum' string in buffer
    if (p==0) p=parse;
    if (b==0) b=buffer;
    return b + p-->(wordnum*3);
];

[ WordLength wordnum p;     ! Length of 'wordnum' string in buffer
    if (p==0) p=parse;
    return p-->(wordnum*3-1);
];

[ WordValue wordnum p;      ! Dictionary value of 'wordnum' string in buffer
    if (p==0) p=parse;
    return p-->(wordnum*3-2);
];

[ NumberWords p;            ! Number of parsed strings in buffer
    if (p==0) p=parse;
    return p-->0;
];

[ GetKeyBufLength b;        ! Number of typed chars in buffer
    if (b==0) b=buffer;
    return b-->0;
];

[ SetKeyBufLength n b;      ! Update number of typed chars in buffer
    if (b==0) b=buffer;
    if (n > INPUT_BUFFER_LEN-WORDSIZE) n=INPUT_BUFFER_LEN-WORDSIZE;
    b-->0 = n;
];

#Endif; ! TARGET_

! ----------------------------------------------------------------------------
!  TryNumber is the only routine which really does any character-level
!  parsing, since that's normally left to the Z-machine.
!  It takes word number "wordnum" and tries to parse it as an (unsigned)
!  decimal number, returning
!
!  -1000                if it is not a number
!  the number           if it has between 1 and 4 digits
!  10000                if it has 5 or more digits.
!
!  (The danger of allowing 5 digits is that Z-machine integers are only
!  16 bits long, and anyway this isn't meant to be perfect.)
!
!  Using NumberWord, it also catches "one" up to "twenty".
!
!  Note that a game can provide a ParseNumber routine which takes priority,
!  to enable parsing of odder numbers ("x45y12", say).
! ----------------------------------------------------------------------------

[ TryNumber wordnum   i j c num len mul tot d digit;
    i = wn; wn = wordnum; j = NextWord(); wn = i;
    j = NumberWord(j);
    if (j >= 1) return j;

    num = WordAddress(wordnum); len = WordLength(wordnum);

    tot = ParseNumber(num, len);
    if (tot == 0) tot = LibraryExtensions.RunWhile(ext_parsenumber, 0, num, len);

    if (tot ~= 0) return tot;

    if (len >= 4) mul=1000;
    if (len == 3) mul=100;
    if (len == 2) mul=10;
    if (len == 1) mul=1;

    tot = 0; c = 0;

    for (c = 0 : c < len : c++) {
        digit=num->c;
        if (digit == '0') { d = 0; jump digok; }
        if (digit == '1') { d = 1; jump digok; }
        if (digit == '2') { d = 2; jump digok; }
        if (digit == '3') { d = 3; jump digok; }
        if (digit == '4') { d = 4; jump digok; }
        if (digit == '5') { d = 5; jump digok; }
        if (digit == '6') { d = 6; jump digok; }
        if (digit == '7') { d = 7; jump digok; }
        if (digit == '8') { d = 8; jump digok; }
        if (digit == '9') { d = 9; jump digok; }
        return -1000;
     .digok;
        tot = tot+mul*d; mul = mul/10;
    }
    if (len > 4) tot=10000;
    return tot;
];

! ----------------------------------------------------------------------------
!  AnyNumber is a general parsing routine which accepts binary, hexadecimal
!  and decimal numbers up to the full Zcode/Glulx ranges.
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;                ! decimal range is -32768 to 32767
Constant MAX_DECIMAL_SIZE 5;
Constant MAX_DECIMAL_BASE 3276;
#Ifnot; ! TARGET_GLULX              ! decimal range is -2147483648 to 2147483647
Constant MAX_DECIMAL_SIZE 10;
Constant MAX_DECIMAL_BASE 214748364;
#Endif; ! TARGET_

[ AnyNumber
    wa we sign base digit digit_count num;

    wa = WordAddress(wn); we = wa + WordLength(wn);
    sign = 1; base = 10;
    if     (wa->0 == '-') { sign = -1; wa++; }
    else {
        if (wa->0 == '$') { base = 16; wa++; }
        if (wa->0 == '$') { base = 2;  wa++; }
    }
    if (wa >= we) return GPR_FAIL;  ! no digits after -/$
    while (wa->0 == '0') wa++;      ! skip leading zeros
    for (num=0,digit_count=1 : wa<we : wa++,digit_count++) {
        switch (wa->0) {
          '0' to '9': digit = wa->0 - '0';
          'A' to 'F': digit = wa->0 - 'A' + 10;
          'a' to 'f': digit = wa->0 - 'a' + 10;
          default:    return GPR_FAIL;
        }
        if (digit >= base) return GPR_FAIL;
        switch (base) {
          16:     if (digit_count > 2*WORDSIZE)  return GPR_FAIL;
          2:      if (digit_count > 8*WORDSIZE)  return GPR_FAIL;
          10:
            if (digit_count >  MAX_DECIMAL_SIZE) return GPR_FAIL;
            if (digit_count == MAX_DECIMAL_SIZE) {
                if (num >  MAX_DECIMAL_BASE)     return GPR_FAIL;
                if (num == MAX_DECIMAL_BASE) {
                    if (sign == 1  && digit > 7) return GPR_FAIL;
                    if (sign == -1 && digit > 8) return GPR_FAIL;
                }
            }
        }
        num = base*num + digit;
    }
   parsed_number = num * sign;
    wn++;
    return GPR_NUMBER;
];

! ----------------------------------------------------------------------------
!  GetGender returns 0 if the given animate object is female, and 1 if male
!  (not all games will want such a simple decision function!)
! ----------------------------------------------------------------------------

[ GetGender person;
    if (person hasnt female) rtrue;
    rfalse;
];

[ GetGNAOfObject obj case gender;
    if (obj hasnt animate) case = 6;
    if (obj has male) gender = male;
    if (obj has female) gender = female;
    if (obj has neuter) gender = neuter;
    if (gender == 0) {
        if (case == 0) gender = LanguageAnimateGender;
        else gender = LanguageInanimateGender;
    }
    if (gender == female)   case = case + 1;
    if (gender == neuter)   case = case + 2;
    if (obj has pluralname) case = case + 3;
    return case;
];

! ----------------------------------------------------------------------------
!  Converting between dictionary addresses and entry numbers
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ Dword__No w; return (w-(HDR_DICTIONARY-->0 + 7))/9; ];
[ No__Dword n; return HDR_DICTIONARY-->0 + 7 + 9*n; ];

#Ifnot; ! TARGET_GLULX

! In Glulx, dictionary entries *are* addresses.
[ Dword__No w; return w; ];
[ No__Dword n; return n; ];

#Endif; ! TARGET_

! ----------------------------------------------------------------------------
!  For copying buffers
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ CopyBuffer bto bfrom i size;
    size = bto->0;
    for (i=1 : i<=size : i++) bto->i = bfrom->i;
];

#Ifnot; ! TARGET_GLULX

[ CopyBuffer bto bfrom i;
    for (i=0 : i<INPUT_BUFFER_LEN : i++) bto->i = bfrom->i;
];

#Endif; ! TARGET_

! ----------------------------------------------------------------------------
!  Provided for use by language definition files
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ LTI_Insert i ch  b y;

    ! Protect us from strict mode, as this isn't an array in quite the
    ! sense it expects
    b = buffer;

    ! Insert character ch into buffer at point i.
    ! Being careful not to let the buffer possibly overflow:
    y = b->1;
    if (y > b->0) y = b->0;

    ! Move the subsequent text along one character:
    for (y=y+2 : y>i : y--) b->y = b->(y-1);
    b->i = ch;

    ! And the text is now one character longer:
    if (b->1 < b->0) (b->1)++;
];

#Ifnot; ! TARGET_GLULX

[ LTI_Insert i ch  b y;

    ! Protect us from strict mode, as this isn't an array in quite the
    ! sense it expects
    b = buffer;

    ! Insert character ch into buffer at point i.
    ! Being careful not to let the buffer possibly overflow:
    y = b-->0;
    if (y > INPUT_BUFFER_LEN) y = INPUT_BUFFER_LEN;

    ! Move the subsequent text along one character:
    for (y=y+WORDSIZE : y>i : y--) b->y = b->(y-1);
    b->i = ch;

    ! And the text is now one character longer:
    if (b-->0 < INPUT_BUFFER_LEN) (b-->0)++;
];

#Endif; ! TARGET_

! ============================================================================

[ PronounsSub x y c d;
    L__M(##Pronouns, 1);

    c = (LanguagePronouns-->0)/3;
    if (player ~= selfobj) c++;

    if (c == 0) return L__M(##Pronouns, 4);

    for (x=1,d=0 : x<=LanguagePronouns-->0 : x=x+3) {
        print "~", (address) LanguagePronouns-->x, "~ ";
        y = LanguagePronouns-->(x+2);
        if (y == NULL) L__M(##Pronouns, 3);
        else {
            L__M(##Pronouns, 2);
            print (the) y;
        }
        d++;
        if (d < c-1) print (string) COMMA__TX;
        if (d == c-1) print (SerialComma) c, (string) AND__TX;
    }
    if (player ~= selfobj) {
        print "~", (address) ME1__WD, "~ "; L__M(##Pronouns, 2);
        c = player; player = selfobj;
        print (the) c; player = c;
    }
    L__M(##Pronouns, 5);
];

[ SetPronoun dword value x;
    for (x=1 : x<=LanguagePronouns-->0 : x=x+3)
        if (LanguagePronouns-->x == dword) {
            LanguagePronouns-->(x+2) = value; return;
        }
    RunTimeError(12);
];

[ PronounValue dword x;
    for (x=1 : x<=LanguagePronouns-->0 : x=x+3)
        if (LanguagePronouns-->x == dword)
            return LanguagePronouns-->(x+2);
    return 0;
];

[ ResetVagueWords obj; PronounNotice(obj); ];

#Ifdef EnglishNaturalLanguage;

[ PronounOldEnglish;
    if (itobj ~= old_itobj)   SetPronoun('it', itobj);
    if (himobj ~= old_himobj) SetPronoun('him', himobj);
    if (herobj ~= old_herobj) SetPronoun('her', herobj);
    old_itobj = itobj; old_himobj = himobj; old_herobj = herobj;
];

#Endif; !EnglishNaturalLanguage

[ PronounNotice obj x bm;
    if (obj == player) return;

    #Ifdef EnglishNaturalLanguage;
    PronounOldEnglish();
    #Endif; ! EnglishNaturalLanguage

    bm = PowersOfTwo_TB-->(GetGNAOfObject(obj));

    for (x=1 : x<=LanguagePronouns-->0 : x=x+3)
        if (bm & (LanguagePronouns-->(x+1)) ~= 0)
            LanguagePronouns-->(x+2) = obj;

    #Ifdef EnglishNaturalLanguage;
    itobj  = PronounValue('it');  old_itobj  = itobj;
    himobj = PronounValue('him'); old_himobj = himobj;
    herobj = PronounValue('her'); old_herobj = herobj;
    #Endif; ! EnglishNaturalLanguage
];

! ============================================================================
!  End of the parser proper: the remaining routines are its front end.
! ----------------------------------------------------------------------------

Object  InformLibrary "(Inform Library)"
  with  play [ i j k l;

            #Ifdef TARGET_ZCODE;
            ZZInitialise();
            #Ifnot; ! TARGET_GLULX
            GGInitialise();
            #Endif; ! TARGET_

            GamePrologue();
            while (~~deadflag) {    ! everything happens in this loop

                #Ifdef EnglishNaturalLanguage;
                PronounOldEnglish();
                old_itobj = PronounValue('it');
                old_himobj = PronounValue('him');
                old_herobj = PronounValue('her');
                #Endif; ! EnglishNaturalLanguage

              .very__late__error;

                if (score ~= last_score) {
                    if (notify_mode == 1) NotifyTheScore();
                    last_score = score;
                }

              .late__error;

                inputobjs-->0 = 0; inputobjs-->1 = 0;
                inputobjs-->2 = 0; inputobjs-->3 = 0; meta = false;

                ! The Parser writes its results into inputobjs and meta,
                ! a flag indicating a "meta-verb".  This can only be set for
                ! commands by the player, not for orders to others.

                InformParser.parse_input(inputobjs);

                action = inputobjs-->0;

                ! --------------------------------------------------------------

                ! Reverse "give fred biscuit" into "give biscuit to fred"

                if (action == ##GiveR or ##ShowR) {
                    i = inputobjs-->2; inputobjs-->2 = inputobjs-->3; inputobjs-->3 = i;
                    if (action == ##GiveR) action = ##Give; else action = ##Show;
                }

                ! Convert "P, tell me about X" to "ask P about X"

                if (action == ##Tell && inputobjs-->2 == player && actor ~= player) {
                    inputobjs-->2 = actor; actor = player; action = ##Ask;
                }

                ! Convert "ask P for X" to "P, give X to me"

                if (action == ##AskFor && inputobjs-->2 ~= player && actor == player) {
                    actor = inputobjs-->2; inputobjs-->2 = inputobjs-->3;
                    inputobjs-->3 = player; action = ##Give;
                }

                ! For old, obsolete code: special_word contains the topic word
                ! in conversation

                if (action == ##Ask or ##Tell or ##Answer)
                    special_word = special_number1;

                !  --------------------------------------------------------------

                multiflag = false; onotheld_mode = notheld_mode; notheld_mode = false;
                ! For implicit taking and multiple object detection

              .begin__action;
                inp1 = 0; inp2 = 0; i = inputobjs-->1;
                if (i >= 1) inp1 = inputobjs-->2;
                if (i >= 2) inp2 = inputobjs-->3;

                ! inp1 and inp2 hold: object numbers, or 0 for "multiple object",
                ! or 1 for "a number or dictionary address"

                if (inp1 == 1) noun = special_number1; else noun = inp1;
                if (inp2 == 1) {
                    if (inp1 == 1) second = special_number2;
                    else           second = special_number1;
                }
                else second = inp2;

                !  -------------------------------------------------------------

!print "inp1:          ", (name) inp1, "^";
!print "inp2:          ", (name) inp2, "^";
!print "inputobjs-->1: ", (name) inputobjs-->1, "^";
!print "inputobjs-->2: ", (name) inputobjs-->2, "^";
!print "inputobjs-->3: ", (name) inputobjs-->3, "^";
!print "noun:          ", (name) noun, "^";
!print "second:        ", (name) second, "^";
!print "actor:         ", (name) actor, "^";
!print "---^";

                ! --------------------------------------------------------------
                ! Generate the action...

                if ((i == 0) ||
                    (i == 1 && inp1 ~= 0) ||
                    (i == 2 && inp1 ~= 0 && inp2 ~= 0)) {

                    if (actor ~= player) {
                         switch (self.actor_act(actor, action, noun, second)) {
                             ACTOR_ACT_ABORT_NOTUNDERSTOOD: jump begin__action;
                             default: jump turn__end;
                         }

                    }


                    self.begin_action(action, noun, second, 0);
                    jump turn__end;
                }

                ! ...unless a multiple object must be substituted.  First:
                ! (a) check the multiple list isn't empty;
                ! (b) warn the player if it has been cut short because too long;
                ! (c) generate a sequence of actions from the list
                !     (stopping in the event of death or movement away).

                multiflag = true;
                j = multiple_object-->0;
                if (j == 0) {
                    L__M(##Miscellany, 2);
                    jump late__error;
                }
                if (toomany_flag) {
                    toomany_flag = false;
                    L__M(##Miscellany, 1);
                }
                i = location;
                for (k=1 : k<=j : k++) {
                    if (deadflag) break;
                    if (location ~= i) {
                        L__M(##Miscellany, 51);
                        break;
                    }
                    l = multiple_object-->k;
                    PronounNotice(l);
                    print (name) l, (string) COLON__TX, " ";
                    if (inp1 == 0) {
                        inp1 = l;
                        switch (self.actor_act(actor, action, l, second)) {
                          ACTOR_ACT_ABORT_NOTUNDERSTOOD: jump begin__action;
                          ACTOR_ACT_ABORT_ORDER: jump turn__end;
                        }
                        inp1 = 0;
                    }
                    else {
                        inp2 = l;
                        if (self.actor_act(actor, action, noun, l) == ACTOR_ACT_ABORT_NOTUNDERSTOOD)
                            jump begin__action;
                        inp2 = 0;
                    }
                }

                ! --------------------------------------------------------------

              .turn__end;

                ! No time passes if either (i) the verb was meta, or
                ! (ii) we've only had the implicit take before the "real"
                ! action to follow.

                if (notheld_mode == 1) { NoteObjectAcquisitions(); continue; }
                if (meta) continue;
                if (~~deadflag) self.end_turn_sequence();
                else if (START_MOVE ~= 1) turns++;
            } ! end of while()

            if (deadflag ~= 2 && AfterLife() == false)
                 LibraryExtensions.RunAll(ext_afterlife);
            if (deadflag == 0) jump very__late__error;
            GameEpilogue();
        ], ! end of 'play' property

        end_turn_sequence [;
            AdvanceWorldClock();        if (deadflag) return;
            RunTimersAndDaemons();      if (deadflag) return;
            RunEachTurnProperties();    if (deadflag) return;
            if (TimePasses() == 0)  LibraryExtensions.RunAll(ext_timepasses);
                                        if (deadflag) return;
            AdjustLight();              if (deadflag) return;
            NoteObjectAcquisitions();
        ],

        ! The first time we call self.actor_act(), set the fifth
        ! parameter to true.  Details can be seen in
        ! 1d95759b1bd6674509d6cf9161e6db3da3831f10 and in Issues #23 and
        ! #30 (Mantis 1813 and 1885)
        actor_act [ p a n s ft  j sp sa sn ss;
            sp = actor; actor = p;
            if (p ~= player) {
                ! The player's "orders" property can refuse to allow
                ! conversation here, by returning true.  If not, the order is
                ! sent to the other person's "orders" property.  If that also
                ! returns false, then: if it was a misunderstood command
                ! anyway, it is converted to an Answer action (thus
                ! "floyd, grrr" ends up as "say grrr to floyd").  If it was a
                ! good command, it is finally offered to the Order: part of
                ! the other person's "life" property, the old-fashioned
                ! way of dealing with conversation.

                sa = action; sn = noun; ss = second;
                action = a; noun = n; second = s;
                j = RunRoutines(player, orders);
                if (j == 0) {
                    j = RunRoutines(actor, orders);
                    if (j == 0) {
                        if (action == ##NotUnderstood) {
                            inputobjs-->3 = actor; actor = player; action = ##Answer;
                            ! abort, not resetting action globals
                            return ACTOR_ACT_ABORT_NOTUNDERSTOOD;
                        }
                        if (RunLife(actor, ##Order) == 0) {
                            L__M(##Order, 1, actor);
                            if (~~ft)
                                return ACTOR_ACT_ABORT_ORDER;
                        }
                    }
                }
                action = sa; noun = sn; second = ss;
                if (ft)
                    return ACTOR_ACT_ABORT_ORDER;
            }
            else
                if (~~ft)
                    self.begin_action(a, n, s, 0);

            actor = sp;
            return ACTOR_ACT_OK;
        ],

        begin_action [ a n s source   sa sn ss;
            sa = action; sn = noun; ss = second;
            action = a; noun = n; second = s;
            #Ifdef DEBUG;
            if (debug_flag & DEBUG_ACTIONS) TraceAction(source);
            #Ifnot;
            source = 0;
            #Endif; ! DEBUG

            #Iftrue (Grammar__Version == 1);
            if ((meta || BeforeRoutines() == false) && action < 256) {
                #Ifdef INFIX;
                if (infix_verb) {
                    if (BeforeRoutines() == false)
                        ActionPrimitive();
                } else ActionPrimitive();
                #Ifnot;
                ActionPrimitive();
                #Endif;
            }
            #Ifnot;
            if ((meta || BeforeRoutines() == false) && action < 4096) {
                #Ifdef INFIX;
                if (infix_verb) {
                    if (BeforeRoutines() == false)
                        ActionPrimitive();
                } else ActionPrimitive();
                #Ifnot;
                ActionPrimitive();
                #Endif;
            }
            #Endif; ! Grammar__Version
            action = sa; noun = sn; second = ss;
        ],
  has   proper;

! ----------------------------------------------------------------------------
! Routines called before and after main 'play' loop

[ GamePrologue i j;
    before_first_turn = true;
    for (i=1 : i<=100 : i++) j = random(i);

    ChangeDefault(cant_go, CANTGO__TX);

    real_location = thedark;
    player = selfobj; actor = player;
    selfobj.capacity = MAX_CARRIED; ! ### change?

    #Ifdef LanguageInitialise;
    LanguageInitialise();
    #Endif; ! LanguageInitialise

    #Ifdef EnglishNaturalLanguage;
    old_itobj = itobj; old_himobj = himobj; old_herobj = herobj;
    #Endif;! EnglishNaturalLanguage

    new_line;
    LibraryExtensions.RunAll(ext_initialise);
    j = Initialise();
    last_score = score;
    initial_lookmode = lookmode;

    objectloop (i in player) give i moved ~concealed;
    move player to location;
    while (parent(location)) location = parent(location);
    real_location = location;
    MoveFloatingObjects();

    actor = player; ! resync, because player may have been changed in Initialise()
    actors_location = location;

    lightflag = OffersLight(parent(player));
    if (lightflag == 0) location = thedark;

    if (j ~= 2) Banner();
#Ifndef NOINITIAL_LOOK;
    <Look>;
#Endif;
    before_first_turn = false;
];

[ GameEpilogue;
    if (score ~= last_score) {
        if (notify_mode == 1) NotifyTheScore();
        last_score = score;
    }
    print "^^    ";
    #Ifdef TARGET_ZCODE;
    #IfV5; style bold; #Endif; ! V5
    #Ifnot; ! TARGET_GLULX
    glk_set_style(style_Alert);
    #Endif; ! TARGET_
    print "***";
    switch (deadflag) {
      1:        L__M(##Miscellany, 3);
      2:        L__M(##Miscellany, 4);
      default:  print " ";
                if (DeathMessage() == false)
                    LibraryExtensions.RunAll(ext_deathmessage);
                print " ";
    }
    print "***";
    #Ifdef TARGET_ZCODE;
    #IfV5; style roman; #Endif; ! V5
    #Ifnot; ! TARGET_GLULX
    glk_set_style(style_Normal);
    #Endif; ! TARGET_
    print "^^";
    #Ifndef NO_SCORE;
    print "^";
    #Endif; ! NO_SCORE
    Epilogue();
    ScoreSub();
    DisplayStatus();
    AfterGameOver();
];

! ----------------------------------------------------------------------------
! Routines called at end of each turn

[ AdvanceWorldClock;
    turns++;
    if (the_time ~= NULL) {
        if (time_rate >= 0) the_time=the_time+time_rate;
        else {
            time_step--;
            if (time_step == 0) {
                the_time++;
                time_step = -time_rate;
            }
        }
        the_time = the_time % 1440;
    }
];

[ RunTimersAndDaemons i j;
    #Ifdef DEBUG;
    if (debug_flag & DEBUG_TIMERS) {
        for (i=0 : i<active_timers : i++) {
            j = the_timers-->i;
            if (j ~= 0) {
                print (name) (j&~WORD_HIGHBIT), ": ";
                if (j & WORD_HIGHBIT) print "daemon";
                else
                    print "timer with ", j.time_left, " turns to go";
                new_line;
            }
        }
    }
    #Endif; ! DEBUG

    for (i=0 : i<active_timers : i++) {
        if (deadflag) return;
        j = the_timers-->i;
        if (j ~= 0) {
            if (j & WORD_HIGHBIT) RunRoutines(j&~WORD_HIGHBIT, daemon);
            else {
                if (j.time_left == 0) {
                    StopTimer(j);
                    RunRoutines(j, time_out);
                }
                else
                    j.time_left = j.time_left-1;
            }
        }
    }
];

[ RunEachTurnProperties;
    scope_reason = EACH_TURN_REASON; verb_word = 0;
    DoScopeAction(location);
    SearchScope(ScopeCeiling(player), player, 0);
    scope_reason = PARSING_REASON;
];

! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ ActionPrimitive; (#actions_table-->action)(); ];

#Ifnot; ! TARGET_GLULX

[ ActionPrimitive; (#actions_table-->(action+1))(); ];

#Endif; ! TARGET_

[ AfterGameOver i amus_ret;

  .RRQPL;

    L__M(##Miscellany,5);

  .RRQL;

    L__M(##Prompt);
    #Ifdef TARGET_ZCODE;
    #IfV3; read buffer parse; #Endif; ! V3
    temp_global=0;
    #IfV5; read buffer parse DrawStatusLine; #Endif; ! V5
    #Ifnot; ! TARGET_GLULX
    KeyboardPrimitive(buffer, parse);
    #Endif; ! TARGET_
    i = parse-->1;
    if (i == QUIT1__WD or QUIT2__WD) {
        #Ifdef TARGET_ZCODE;
        quit;
        #Ifnot; ! TARGET_GLULX
        quit;
        #Endif; ! TARGET_
    }
    if (i == RESTART__WD) {
        #Ifdef TARGET_ZCODE;
        @restart;
        #Ifnot; ! TARGET_GLULX
        @restart;
        #Endif; ! TARGET_
    }
    if (i == RESTORE__WD) {
        RestoreSub();
        jump RRQPL;
    }
    if (i == FULLSCORE1__WD or FULLSCORE2__WD && TASKS_PROVIDED==0) {
        new_line; FullScoreSub();
        jump RRQPL;
    }
    if (deadflag == 2 && i == AMUSING__WD) {
        amus_ret = false;
        if (AMUSING_PROVIDED == 0) {
            new_line;
            amus_ret = Amusing();
        }
        if (amus_ret == false) LibraryExtensions.RunAll(ext_amusing);
        jump RRQPL;
    }
    #IfV5;
    if (i == UNDO1__WD or UNDO2__WD or UNDO3__WD) {
        i = PerformUndo();
        if (i == 0) jump RRQPL;
    }
    #Endif; ! V5
    L__M(##Miscellany, 8);
    jump RRQL;
];

[ NoteObjectAcquisitions i;
    objectloop (i in player)
        if (i hasnt moved) {
            give i moved;
            if (i has scored) {
                score = score + OBJECT_SCORE;
                things_score = things_score + OBJECT_SCORE;
            }
        }
];

! ----------------------------------------------------------------------------
! R_Process is invoked by the <...> and <<...>> statements, whose syntax is:
!   <action [noun] [second]>                ! traditional
!   <action [noun] [second], actor>         ! introduced at compiler 6.33

[ R_Process a n s p
    s1 s2 s3;
    s1 = inp1; s2 = inp2; s3 = actor;
    inp1 = n; inp2 = s; if (p) actor = p; else actor = player;
    InformLibrary.begin_action(a, n, s, 1);
    inp1 = s1; inp2 = s2; actor = s3;
];

! ----------------------------------------------------------------------------

[ TestScope obj act a al sr x y;
    x = parser_one; y = parser_two;
    parser_one = obj; parser_two = 0; a = actor; al = actors_location;
    sr = scope_reason; scope_reason = TESTSCOPE_REASON;
    if (act == 0) actor = player; else actor = act;
    actors_location = ScopeCeiling(actor);
    SearchScope(actors_location, actor, 0); scope_reason = sr; actor = a;
    actors_location = al; parser_one = x; x = parser_two; parser_two = y;
    return x;
];

[ LoopOverScope routine act x y a al;
    x = parser_one; y = scope_reason; a = actor; al = actors_location;
    parser_one = routine;
    if (act == 0) actor = player; else actor = act;
    actors_location = ScopeCeiling(actor);
    scope_reason = LOOPOVERSCOPE_REASON;
    SearchScope(actors_location, actor, 0);
    parser_one = x; scope_reason = y; actor = a; actors_location = al;
];

[ BeforeRoutines rv;
    if (GamePreRoutine()) rtrue;
    if (rv == false) rv=LibraryExtensions.RunWhile(ext_gamepreroutine, 0);
    if (rv) rtrue;
    if (RunRoutines(player, orders)) rtrue;
    scope_reason = REACT_BEFORE_REASON; parser_one = 0;
    SearchScope(ScopeCeiling(player), player, 0);
    scope_reason = PARSING_REASON;
    if (parser_one) rtrue;
    if (location && RunRoutines(location, before)) rtrue;
    if (inp1 > 1 && RunRoutines(inp1, before)) rtrue;
    rfalse;
];

[ AfterRoutines rv;
    scope_reason = REACT_AFTER_REASON; parser_one = 0;
    SearchScope(ScopeCeiling(player), player, 0); scope_reason = PARSING_REASON;
    if (parser_one) rtrue;
    if (location && RunRoutines(location, after)) rtrue;
    if (inp1 > 1 && RunRoutines(inp1, after)) rtrue;
    rv = GamePostRoutine();
    if (rv == false) rv=LibraryExtensions.RunWhile(ext_gamepostroutine, false);
    return rv;
];

[ RunLife a j;
    #Ifdef DEBUG;
    if (debug_flag & DEBUG_ACTIONS) TraceAction(2, j);
    #Endif; ! DEBUG
    reason_code = j; return RunRoutines(a,life);
];

[ ZRegion addr;
    switch (metaclass(addr)) {      ! Left over from Inform 5
      nothing:          return 0;
      Object, Class:    return 1;
      Routine:          return 2;
      String:           return 3;
    }
];

[ PrintOrRun obj prop flag;
    if (obj.#prop > WORDSIZE) return RunRoutines(obj, prop);
    if (obj.prop == NULL) rfalse;
    switch (metaclass(obj.prop)) {
      Class, Object, nothing:
        return RunTimeError(2,obj,prop);
      String:
        print (string) obj.prop;
        if (flag == 0) new_line;
        rtrue;
      Routine:
        return RunRoutines(obj, prop);
    }
];

[ PrintOrRunVar var flag;
    switch (metaclass(var)) {
      Object:
        print (name) var;
      String:
        print (string) var;
        if (flag == 0) new_line;
      Routine:
        return var();
      default:
        print (char) '(', var, (char) ')';
    }
    rtrue;
];

[ ValueOrRun obj prop;
  !### this is entirely unlikely to work. Does anyone care? (AP)
  ! Well, it's certainly used three times in verblibm.h (RF)
  ! Update: now not used (RF)
    if (obj.prop < 256) return obj.prop;
    return RunRoutines(obj, prop);
];

[ RunRoutines obj prop;
    if (obj == thedark && prop ~= initial or short_name or description) obj = real_location;
    if (obj.&prop == 0 && prop >= INDIV_PROP_START) rfalse;
    return obj.prop();
];

#Ifdef TARGET_ZCODE;

[ ChangeDefault prop val a b;
    ! Use assembly-language here because -S compilation won't allow this:
    @loadw 0 5 -> a;
    b = prop-1;
    @storew a b val;
];

#Ifnot; ! TARGET_GLULX

[ ChangeDefault prop val;
    ! Use assembly-language here because -S compilation won't allow this:
    ! #cpv__start-->prop = val;
    @astore #cpv__start prop val;
];

#Endif; ! TARGET_

! ----------------------------------------------------------------------------

[ StartTimer obj timer i;
    for (i=0 : i<active_timers : i++)
        if (the_timers-->i == obj) rfalse;
    for (i=0 : i<active_timers : i++)
        if (the_timers-->i == 0) jump FoundTSlot;
    i = active_timers++;
    if (i >= MAX_TIMERS) { RunTimeError(4); return; }
  .FoundTSlot;
    if (obj.&time_left == 0) { RunTimeError(5, obj, time_left); return; }
    the_timers-->i = obj; obj.time_left = timer;
];

[ StopTimer obj i;
    for (i=0 : i<active_timers : i++)
        if (the_timers-->i == obj) jump FoundTSlot2;
    rfalse;
  .FoundTSlot2;
    if (obj.&time_left == 0) { RunTimeError(5, obj, time_left); return; }
    the_timers-->i = 0; obj.time_left = 0;
];

[ StartDaemon obj i;
    for (i=0 : i<active_timers : i++)
        if (the_timers-->i == WORD_HIGHBIT + obj) rfalse;
    for (i=0 : i<active_timers : i++)
        if (the_timers-->i == 0) jump FoundTSlot3;
    i = active_timers++;
    if (i >= MAX_TIMERS) RunTimeError(4);
  .FoundTSlot3;
    the_timers-->i = WORD_HIGHBIT + obj;
];

[ StopDaemon obj i;
    for (i=0 : i<active_timers : i++)
        if (the_timers-->i == WORD_HIGHBIT + obj) jump FoundTSlot4;
    rfalse;
  .FoundTSlot4;
    the_timers-->i = 0;
];

! ----------------------------------------------------------------------------

[ DisplayStatus;
    if (sys_statusline_flag == 0) { sline1 = score; sline2 = turns; }
    else { sline1 = the_time/60; sline2 = the_time%60;}
];

[ SetTime t s;
    the_time = t; time_rate = s; time_step = 0;
    if (s < 0) time_step = 0-s;
];

[ NotifyTheScore;
    #Ifdef TARGET_GLULX;
    glk_set_style(style_Note);
    #Endif; ! TARGET_GLULX
    print "^[";  L__M(##Miscellany, 50, score-last_score);  print ".]^";
    #Ifdef TARGET_GLULX;
    glk_set_style(style_Normal);
    #Endif; ! TARGET_GLULX
];

! ----------------------------------------------------------------------------

[ AdjustLight flag i;
    i = lightflag;
    lightflag = OffersLight(parent(player));

    if (i == 0 && lightflag == 1) {
        location = real_location;
        if (flag == 0) <Look>;
    }

    if (i == 1 && lightflag == 0) {
        real_location = location; location = thedark;
        if (flag == 0) {
            NoteArrival();
            return L__M(##Miscellany, 9);
        }
    }
    if (i == 0 && lightflag == 0) location = thedark;
];

[ OffersLight i j;
    if (i == 0) rfalse;
    if (i has light) rtrue;
    objectloop (j in i)
        if (HasLightSource(j) == 1) rtrue;
    if (i has container) {
        if (i has open || i has transparent)
            return OffersLight(parent(i));
    }
    else {
        if (i has enterable || i has transparent || i has supporter)
            return OffersLight(parent(i));
    }
    rfalse;
];

[ HidesLightSource obj;
    if (obj == player) rfalse;
    if (obj has transparent or supporter) rfalse;
    if (obj has container) return (obj hasnt open);
    return (obj hasnt enterable);
];

[ HasLightSource i j ad;
    if (i == 0) rfalse;
    if (i has light) rtrue;
    if (i has enterable || IsSeeThrough(i) == 1)
        if (~~(HidesLightSource(i)))
            objectloop (j in i)
                if (HasLightSource(j) == 1) rtrue;
    ad = i.&add_to_scope;
    if (parent(i) ~= 0 && ad ~= 0) {
        if (metaclass(ad-->0) == Routine) {
            ats_hls = 0; ats_flag = 1;
            RunRoutines(i, add_to_scope);
            ats_flag = 0; if (ats_hls == 1) rtrue;
        }
        else {
            for (j=0 : (WORDSIZE*j)<i.#add_to_scope : j++)
                if (HasLightSource(ad-->j) == 1) rtrue;
        }
    }
    rfalse;
];

[ ChangePlayer obj flag i;
!   if (obj.&number == 0) return RunTimeError(7, obj);

    if (obj == nothing) obj = selfobj;
    if (actor == player) actor=obj;
    give player ~transparent ~concealed;
    i = obj; while (parent(i) ~= 0) {
        if (i has animate) give i transparent;
        i = parent(i);
    }
    if (player == selfobj && player provides nameless && player.nameless == true) {
        if (player provides narrative_voice) {
            if (player.narrative_voice == 1) {
                player.short_name = MYFORMER__TX;
                (player.&name)-->0 = 'my';
                (player.&name)-->1 = 'former';
                (player.&name)-->2 = 'self';
            } else if (player.narrative_voice == 2) {
                player.short_name = FORMER__TX;
                (player.&name)-->0 = 'my';
                (player.&name)-->1 = 'former';
                (player.&name)-->2 = 'self';
            }
        }
    }


    player = obj;

    give player transparent concealed animate;
    i = player; while (parent(i) ~= 0) i = parent(i);
    location = i; real_location = location;
    if (parent(player) == 0) return RunTimeError(10);
    MoveFloatingObjects();
    lightflag = OffersLight(parent(player));
    if (lightflag == 0) location = thedark;
    print_player_flag = flag;
];

! ----------------------------------------------------------------------------

#Ifdef DEBUG;

#Ifdef TARGET_ZCODE;

[ DebugParameter w;
    print w;
    if (w >= 1 && w <= top_object) print " (", (name) w, ")";
    if (UnsignedCompare(w, dict_start) >= 0 &&
            UnsignedCompare(w, dict_end) < 0 &&
            (w - dict_start) % dict_entry_size == 0)
        print " ('", (address) w, "')";
];

[ DebugAction a anames;
    #Iftrue (Grammar__Version == 1);
    if (a >= 256) { print "<fake action ", a-256, ">"; return; }
    #Ifnot;
    if (a >= 4096) { print "<fake action ", a-4096, ">"; return; }
    #Endif; ! Grammar__Version
    anames = #identifiers_table;
    anames = anames + 2*(anames-->0) + 2*48;
    print (string) anames-->a;
];

[ DebugAttribute a anames;
    if (a < 0 || a >= 48) print "<invalid attribute ", a, ">";
    else {
        anames = #identifiers_table; anames = anames + 2*(anames-->0);
        print (string) anames-->a;
    }
];

#Ifnot; ! TARGET_GLULX

[ DebugParameter w endmem;
    print w;
    @getmemsize endmem;
    if (w >= 1 && w < endmem) {
        if (w->0 >= $70 && w->0 < $7F) print " (", (name) w, ")";
        if (w->0 >= $60 && w->0 < $6F) print " ('", (address) w, "')";
    }
];

[ DebugAction a str;
    if (a >= 4096) { print "<fake action ", a-4096, ">"; return; }
    if (a < 0 || a >= #identifiers_table-->7) print "<invalid action ", a, ">";
    else {
        str = #identifiers_table-->6;
        str = str-->a;
        if (str) print (string) str; else print "<unnamed action ", a, ">";
    }
];

[ DebugAttribute a str;
    if (a < 0 || a >= NUM_ATTR_BYTES*8) print "<invalid attribute ", a, ">";
    else {
        str = #identifiers_table-->4;
        str = str-->a;
        if (str) print (string) str; else print "<unnamed attribute ", a, ">";
    }
];

#Endif; ! TARGET_

[ TraceAction source ar;
    if (source < 2) print "[ Action ", (DebugAction) action;
    else {
        if (ar == ##Order)
            print "[ Order to ", (name) actor, ": ", (DebugAction) action;
        else
            print "[ Life rule ", (DebugAction) ar;
    }
    if (noun ~= 0)   print " with noun ", (DebugParameter) noun;
    if (second ~= 0) print " and second ", (DebugParameter) second;
    if (source == 0) print " ";
    if (source == 1) print " (from < > statement) ";
    print "]^";
];

[ DebugToken token;
    AnalyseToken(token);
    switch (found_ttype) {
      ILLEGAL_TT:
        print "<illegal token number ", token, ">";
      ELEMENTARY_TT:
        switch (found_tdata) {
          NOUN_TOKEN:           print "noun";
          HELD_TOKEN:           print "held";
          MULTI_TOKEN:          print "multi";
          MULTIHELD_TOKEN:      print "multiheld";
          MULTIEXCEPT_TOKEN:    print "multiexcept";
          MULTIINSIDE_TOKEN:    print "multiinside";
          CREATURE_TOKEN:       print "creature";
          SPECIAL_TOKEN:        print "special";
          NUMBER_TOKEN:         print "number";
          TOPIC_TOKEN:          print "topic";
          ENDIT_TOKEN:          print "END";
        }
      PREPOSITION_TT:
        print "'", (address) found_tdata, "'";
      ROUTINE_FILTER_TT:
        #Ifdef INFIX;
        print "noun=", (InfixPrintPA) found_tdata;
        #Ifnot;
        print "noun=Routine(", found_tdata, ")";
        #Endif; ! INFIX
      ATTR_FILTER_TT:
        print (DebugAttribute) found_tdata;
      SCOPE_TT:
        #Ifdef INFIX;
        print "scope=", (InfixPrintPA) found_tdata;
        #Ifnot;
        print "scope=Routine(", found_tdata, ")";
        #Endif; ! INFIX
      GPR_TT:
        #Ifdef INFIX;
        print (InfixPrintPA) found_tdata;
        #Ifnot;
        print "Routine(", found_tdata, ")";
        #Endif; ! INFIX
    }
];

[ DebugGrammarLine pcount;
    print " * ";
    for (: line_token-->pcount ~= ENDIT_TOKEN : pcount++) {
        if ((line_token-->pcount)->0 & $10) print "/ ";
        print (DebugToken) line_token-->pcount, " ";
    }
    print "-> ", (DebugAction) action_to_be;
    if (action_reversed) print " reverse";
];

#Ifdef TARGET_ZCODE;

[ ShowVerbSub grammar lines j;
    if (noun == 0 || ((noun->#dict_par1) & DICT_VERB) == 0)
        "Try typing ~showverb~ and then the name of a verb.";
    print "Verb";
    if ((noun->#dict_par1) & DICT_META) print " meta";
    for (j=dict_start : j<dict_end : j=j+dict_entry_size)
        if (j->#dict_par2 == noun->#dict_par2)
            print " '", (address) j, "'";
    new_line;
    grammar = (HDR_STATICMEMORY-->0)-->($ff-(noun->#dict_par2));
    lines = grammar->0;
    grammar++;
    if (lines == 0) "has no grammar lines.";
    for (: lines>0 : lines--) {
        grammar = UnpackGrammarLine(grammar);
        print "    "; DebugGrammarLine(); new_line;
    }
];

#Ifnot; ! TARGET_GLULX

[ ShowVerbSub grammar lines i j wd dictlen entrylen;
    if (noun == 0 || ((noun->#dict_par1) & DICT_VERB) == 0)
        "Try typing ~showverb~ and then the name of a verb.";
    print "Verb";
    if ((noun->#dict_par1) & DICT_META) print " meta";
    dictlen = #dictionary_table-->0;
    entrylen = DICT_WORD_SIZE + 7;
    for (j=0 : j<dictlen : j++) {
        wd = #dictionary_table + WORDSIZE + entrylen*j;
        if (wd->#dict_par2 == noun->#dict_par2)
            print " '", (address) wd, "'";
    }
    new_line;
    i = DictionaryWordToVerbNum(noun);
    grammar = (#grammar_table)-->(i+1);
    lines = grammar->0;
    grammar++;
    if (lines == 0) "has no grammar lines.";
    for (: lines>0 : lines--) {
        grammar = UnpackGrammarLine(grammar);
        print "    "; DebugGrammarLine(); new_line;
    }
];

#Endif; ! TARGET_

[ ShowObjSub c f l a n x numattr;
    if (noun == 0) noun = location;
    objectloop (c ofclass Class) if (noun ofclass c) { f++; l=c; }
    if (f == 1) print (name) l, " ~"; else print "Object ~";
    print (name) noun, "~ (", noun, ")";
    if (parent(noun)) print " in ~", (name) parent(noun), "~ (", parent(noun), ")";
    new_line;
    if (f > 1) {
        print "  class ";
        objectloop (c ofclass Class) if (noun ofclass c) print (name) c, " ";
        new_line;
    }
    #Ifdef TARGET_ZCODE;
    numattr = 48;
    #Ifnot; ! TARGET_GLULX
    numattr = NUM_ATTR_BYTES * 8;
    #Endif; ! TARGET_
    for (a=0,f=0 : a<numattr : a++) if (noun has a) f=1;
    if (f) {
        print "  has ";
        for (a=0 : a<numattr : a++) if (noun has a) print (DebugAttribute) a, " ";
        new_line;
    }
    if (noun ofclass Class) return;

    f=0;
    #Ifdef TARGET_ZCODE;
    l = #identifiers_table-->0;
    #Ifnot; ! TARGET_GLULX
    l = INDIV_PROP_START + #identifiers_table-->3;
    #Endif; ! TARGET_
    for (a=1 : a<=l : a++) {
        if ((a ~= 2 or 3) && noun.&a) {
            if (f == 0) { print "  with "; f=1; }
            print (property) a;
            n = noun.#a;
            for (c=0 : WORDSIZE*c<n : c++) {
                print " ";
                x = (noun.&a)-->c;
                if (a == name) print "'", (address) x, "'";
                else {
                    if (a == number or capacity or time_left) print x;
                    else {
                        switch (x) {
                          NULL: print "NULL";
                          0:    print "0";
                          1:    print "1";
                          default:
                            switch (metaclass(x)) {
                              Class, Object:
                                print (name) x;
                              String:
                                print "~", (string) x, "~";
                              Routine:
                                print "[...]";
                           }
                           print " (", x, ")";
                        }
                    }
                }
            }
            print ",^       ";
        }
    }
!   if (f==1) new_line;
];

[ ShowDictSub_helper x; print (address) x; ];
[ ShowDictSub
    dp el ne   f x y z;

    #Ifdef TARGET_ZCODE;
    dp = HDR_DICTIONARY-->0;             ! start of dictionary
    dp = dp + dp->0 + 1;                 ! skip over word-separators table
    el = dp->0;  dp = dp + 1;            ! entry length
    ne = dp-->0; dp = dp + WORDSIZE;     ! number of entries
    #Ifnot; ! TARGET_GLULX;
    dp = #dictionary_table;              ! start of dictionary
    el = DICT_WORD_SIZE + 7;             ! entry length
    ne = dp-->0; dp = dp + WORDSIZE;     ! number of entries
    #Endif; ! TARGET_
                                         ! dp now at first entry
    wn = 2; x = NextWordStopped();
    switch (x) {
      0:
        "That word isn't in the dictionary.";
      -1:
        ;                                ! show all entries
      THEN1__WD:
        dp = './/'; ne = 1;              ! show '.'
      COMMA_WORD:
        dp = ',//'; ne = 1;              ! show ','
      default:
        dp = x; ne = 1; f = true;        ! show specified entry, plus associated objects
    }
    for ( : ne-- : dp=dp+el) {
        print (address) dp, " --> ";
        x = dp->#dict_par1;              ! flag bits
        y = PrintToBuffer(StorageForShortName, SHORTNAMEBUF_LEN, ShowDictSub_helper, dp) + WORDSIZE;
        for (z=WORDSIZE : z<y : z++) {
            !if (x & DICT_NOUN) StorageForShortName->z = UpperCase(StorageForShortName->z);
            if (y > WORDSIZE+1 && StorageForShortName->z == ' ' or '.' or ',') x = x | $8000;
            print (char) StorageForShortName->z;
        }
        print " --> ";
        if (x == 0)
            print " no flags";
        else {
            !if (x & $0040)     print " BIT_6";
            !if (x & $0020)     print " BIT_5";
            !if (x & $0010)     print " BIT_4";
            if (x & $8000)     print " UNTYPEABLE";
            if (x & DICT_NOUN) print " noun";
            if (x & DICT_PLUR) print "+plural";
            if (x & DICT_VERB) print " verb";
            if (x & DICT_META) print "+meta";
            if (x & DICT_PREP) print " preposition";
            if (f && (x & DICT_NOUN)) {
                print " --> refers to these objects:";
                objectloop (x)
                    if (WordInProperty(dp, x, name)) print "^  ", (name) x, " (", x, ")";
            }
        }
        new_line;
    }
];

#Endif; ! DEBUG

! ----------------------------------------------------------------------------
!  Miscellaneous display routines used by DrawStatusLine and available for
!  user.  Most of these vary according to which machine is being compiled to
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

[ ClearScreen window;
    switch (window) {
      WIN_ALL:    @erase_window -1;
      WIN_STATUS: @erase_window 1;
      WIN_MAIN:   @erase_window 0;
    }
];

#Iftrue (#version_number == 6);
[ MoveCursorV6 line column  charw;  ! 1-based postion on text grid
    @get_wind_prop 1 13 -> charw; ! font size
    charw = charw & $FF;
    line = 1 + charw*(line-1);
    column = 1 + charw*(column-1);
    @set_cursor line column;
];
#Endif;

#Ifndef MoveCursor;
[ MoveCursor line column;  ! 1-based postion on text grid
    if (~~statuswin_current) {
        @set_window 1;
        #Ifdef COLOUR;
        if (clr_on && clr_bgstatus > 1)
            @set_colour clr_fgstatus clr_bgstatus;
        else
        #Endif; ! COLOUR
            style reverse;
    }
    if (line == 0) { line = 1; column = 1; }
    #Iftrue (#version_number == 6);
    MoveCursorV6(line, column);
    #Ifnot;
    @set_cursor line column;
    #Endif;
    statuswin_current = true;
];
#Endif;

[ MainWindow;
    if (statuswin_current) {
#Ifdef COLOUR;
        if (clr_on && clr_bgstatus > 1) @set_colour clr_fg clr_bg;
        else
#Endif; ! COLOUR
            style roman;
        @set_window 0;
        }
    statuswin_current = false;
];

#Iftrue (#version_number == 6);
[ ScreenWidth  width charw;
    @get_wind_prop 1 3 -> width;
    @get_wind_prop 1 13 -> charw;
    charw = charw & $FF;
    if (charw == 0) return width;
    return (width+charw-1) / charw;
];
#Ifnot;
[ ScreenWidth;
    return (HDR_SCREENWCHARS->0);
];
#Endif;

[ ScreenHeight;
    return (HDR_SCREENHLINES->0);
];

#Iftrue (#version_number == 6);
[ StatusLineHeight height  wx wy x y charh;
    ! Split the window. Standard 1.0 interpreters should keep the window 0
    ! cursor in the same absolute position, but older interpreters,
    ! including Infocom's don't - they keep the window 0 cursor in the
    ! same position relative to its origin. We therefore compensate
    ! manually.
    @get_wind_prop 0 0 -> wy; @get_wind_prop 0 1 -> wx;
    @get_wind_prop 0 13 -> charh; @log_shift charh $FFF8 -> charh;
    @get_wind_prop 0 4 -> y; @get_wind_prop 0 5 -> x;
    height = height * charh;
    @split_window height;
    y = y - height + wy - 1;
    if (y < 1) y = 1;
    x = x + wx - 1;
    @set_cursor y x 0;
    gg_statuswin_cursize = height;
];
#Ifnot;
[ StatusLineHeight height;
    if (gg_statuswin_cursize ~= height)
        @split_window height;
    gg_statuswin_cursize = height;
];
#Endif;

#Ifdef COLOUR;
[ SetColour f b window;
    if (window == 0) {  ! if setting both together, set reverse
        clr_fgstatus = b;
        clr_bgstatus = f;
    }
    if (window == 1) {
        clr_fgstatus = f;
        clr_bgstatus = b;
    }
    if (window == 0 or 2) {
        clr_fg = f;
        clr_bg = b;
    }
    if (clr_on) {
        if (statuswin_current)
            @set_colour clr_fgstatus clr_bgstatus;
        else
            @set_colour clr_fg clr_bg;
    }
];
#Endif; ! COLOUR


#Ifnot; ! TARGET_GLULX

[ ClearScreen window;
    if (window == WIN_ALL or WIN_MAIN) {
        glk_window_clear(gg_mainwin);
        if (gg_quotewin) {
            glk_window_close(gg_quotewin, 0);
            gg_quotewin = 0;
        }
    }
    if (gg_statuswin && window == WIN_ALL or WIN_STATUS)
        glk_window_clear(gg_statuswin);
];

[ MoveCursor line column;  ! 0-based postion on text grid
    if (gg_statuswin) {
        glk_set_window(gg_statuswin);
    }
    if (line == 0) { line = 1; column = 1; }
    glk_window_move_cursor(gg_statuswin, column-1, line-1);
    statuswin_current=1;
];

[ MainWindow;
    glk_set_window(gg_mainwin);
    statuswin_current=0;
];

[ MakeColourWord c;
    if (c > 9) return c;
    c = c-2;
    return $ff0000*(c&1) + $ff00*(c&2 ~= 0) + $ff*(c&4 ~= 0);
];

[ ScreenWidth  id;
    id=gg_mainwin;
    if (gg_statuswin && statuswin_current) id = gg_statuswin;
    glk_window_get_size(id, gg_arguments, 0);
    return gg_arguments-->0;
];

[ ScreenHeight;
    glk_window_get_size(gg_mainwin, 0, gg_arguments);
    return gg_arguments-->0;
];

#Ifdef COLOUR;
[ SetColour f b window;
    if (window == 0) {  ! if setting both together, set reverse
        clr_fgstatus = b;
        clr_bgstatus = f;
    }
    if (window == 1) {
        clr_fgstatus = f;
        clr_bgstatus = b;
    }
    if (window == 0 or 2) {
        clr_fg = f;
        clr_bg = b;
    }
    if (clr_on) {
        if (glk_gestalt(gestalt_GarglkText, 0)) {
            if (f >= 0 && f < 10) {
                f = GlulxColourValues-->f;
            }
            else {
                f = -2;
            }
            if (b >= 0 && b < 10) {
                b = GlulxColourValues-->b;
            }
            else {
                b = -2;
            }
            garglk_set_zcolors(f, b);
        }
    }
];
#Endif; ! COLOUR
#Endif; ! TARGET_

#Ifndef COLOUR;
[ SetColour f b window doclear;
    f = b = window = doclear = 0;
];
#Endif;

[ SetClr f b w;
    SetColour (f, b, w);
];

[ RestoreColours;    ! L61007, L61113
    gg_statuswin_cursize = -1;    ! Force window split in StatusLineHeight()
    #Ifdef COLOUR;
    if (clr_on) { ! check colour has been used
        SetColour(clr_fg, clr_bg, 2); ! make sure both sets of variables are restored
        SetColour(clr_fgstatus, clr_bgstatus, 1, true);
        ClearScreen();
    }
    #Endif;
    #Ifdef TARGET_ZCODE;
    #Iftrue (#version_number == 6); ! request screen update
    (0-->8) = (0-->8) | $$00000100;
    #Endif;
    #Endif; ! TARGET_
];

! ----------------------------------------------------------------------------
!  Except in Version 3, the DrawStatusLine routine does just that: this is
!  provided explicitly so that it can be Replace'd to change the style, and
!  as written it emulates the ordinary Standard game status line, which is
!  drawn in hardware
! ----------------------------------------------------------------------------

#Ifdef TARGET_ZCODE;

#IfV5;

#Iftrue (#version_number == 6);
[ DrawStatusLine width x charw scw mvw;
    HDR_GAMEFLAGS-->0 = (HDR_GAMEFLAGS-->0) & ~$0004;

    StatusLineHeight(gg_statuswin_size);
    ! Now clear the window. This isn't totally trivial. Our approach is to
    ! select the fixed space font, measure its width, and print an appropriate
    ! number of spaces. We round up if the screen isn't a whole number of
    ! characters wide, and rely on window 1 being set to clip by default.
    MoveCursor(1, 1);
    @set_font 4 -> x;
    width = ScreenWidth();
    spaces width;
    ! Back to standard font for the display. We use output_stream 3 to
    ! measure the space required, the aim being to get 50 characters
    ! worth of space for the location name.
    MoveCursor(1, 2);
    @set_font 1 -> x;
    if (location == thedark)
        print (name) location;
    else {
        FindVisibilityLevels();
        if (visibility_ceiling == location) print (name) location;
        else                                print (The) visibility_ceiling;
    }
    @get_wind_prop 1 3 -> width;
    @get_wind_prop 1 13 -> charw;
    charw = charw & $FF;
    @output_stream 3 StorageForShortName;
    print (string) SCORE__TX, "00000";
    @output_stream -3; scw = HDR_PIXELSTO3-->0 + charw;
    @output_stream 3 StorageForShortName;
    print (string) MOVES__TX, "00000";
    @output_stream -3; mvw = HDR_PIXELSTO3-->0 + charw;
    if (width - scw - mvw >= 50*charw) {
        x = 1+width-scw-mvw;
        @set_cursor 1 x; print (string) SCORE__TX, sline1;
        x = x+scw;
        @set_cursor 1 x; print (string) MOVES__TX, sline2;
    }
    else {
        @output_stream 3 StorageForShortName;
        print "00000/00000";
        @output_stream -3; scw = HDR_PIXELSTO3-->0 + charw;
        if (width - scw >= 50*charw) {
            x = 1+width-scw;
            @set_cursor 1 x; print sline1, "/", sline2;
        }
    }
    ! Reselect roman, as Infocom's interpreters interpreters go funny
    ! if reverse is selected twice.
    MainWindow();
];

#Endif; ! #version_number == 6

#Endif; ! V5

#Endif; ! TARGET_ZCODE

#Ifndef DrawStatusLine;
[ DrawStatusLine width posa posb posc;
    #Ifdef TARGET_GLULX;
    ! If we have no status window, we must not try to redraw it.
    if (gg_statuswin == 0)
        return;
    #Endif;

    ! If there is no player location, we shouldn't try to draw status window
    if (location == nothing || parent(player) == nothing)
        return;

    StatusLineHeight(gg_statuswin_size);
    MoveCursor(1, 1);

    width = ScreenWidth();
    posa = width-26;
    posb = width-13;
    posc = width-5;
    spaces width;

    MoveCursor(1, 2);
    if (location == thedark) {
        print (name) location;
    }
    else {
        FindVisibilityLevels();
        if (visibility_ceiling == location)
            print (name) location;
        else
            print (The) visibility_ceiling;
    }

    if (sys_statusline_flag && width > 53) {
        MoveCursor(1, posa);
        print (string) TIME__TX;
        LanguageTimeOfDay(sline1, sline2);
    }
    else {
        if (width > 66) {
            #Ifndef NO_SCORE;
            MoveCursor(1, posa);
            print (string) SCORE__TX, sline1;
            #Endif;
            MoveCursor(1, posb);
            print (string) MOVES__TX, sline2;
        }
        if (width > 53 && width <= 66) {
            MoveCursor(1, posb);
            #Ifdef NO_SCORE;
            print (string) MOVES__TX, sline2;
            #Ifnot;
            print sline1, "/", sline2;
            #Endif;
        }
        if (width < 53) {
           MoveCursor(1, posc);
           #Ifdef NO_SCORE;
           print (string) MOVES_S__TX, sline2;
           #Ifnot;
           print sline1, "/", sline2;
           #Endif;
        }
    }

    MainWindow(); ! set_window
];
#Endif;

#Ifdef TARGET_GLULX;

[ StatusLineHeight hgt parwin;
    if (gg_statuswin == 0) return;
    if (hgt == gg_statuswin_cursize) return;
    parwin = glk_window_get_parent(gg_statuswin);
    glk_window_set_arrangement(parwin, $12, hgt, 0);
    gg_statuswin_cursize = hgt;
];

[ Box__Routine maxwid arr ix lines lastnl parwin;
    maxwid = 0; ! squash compiler warning
    lines = arr-->0;

    if (gg_quotewin == 0) {
        gg_arguments-->0 = lines;
        ix = InitGlkWindow(GG_QUOTEWIN_ROCK);
        if (ix == false) ix = LibraryExtensions.RunWhile(ext_InitGlkWindow, 0, GG_QUOTEWIN_ROCK);
        if (ix == false)
            gg_quotewin = glk_window_open(gg_mainwin, $12, lines, 3,
                GG_QUOTEWIN_ROCK); ! window_open
    }
    else {
        parwin = glk_window_get_parent(gg_quotewin);
        glk_window_set_arrangement(parwin, $12, lines, 0);
    }

    lastnl = true;
    if (gg_quotewin) {
        glk_window_clear(gg_quotewin);
        glk_set_window(gg_quotewin);
        lastnl = false;
    }

    ! If gg_quotewin is zero here, the quote just appears in the story window.

    glk_set_style(style_BlockQuote);
    for (ix=0 : ix<lines : ix++) {
        print (string) arr-->(ix+1);
        if (ix < lines-1 || lastnl) new_line;
    }
    glk_set_style(style_Normal);

    if (gg_quotewin) {
        glk_set_window(gg_mainwin);
    }
];

#Endif; ! TARGET_GLULX


#Ifdef TARGET_ZCODE;

[ ZZInitialise;
    standard_interpreter = HDR_TERPSTANDARD-->0;
   transcript_mode = ((HDR_GAMEFLAGS-->0) & $0001);
    sys_statusline_flag = ( (HDR_TERPFLAGS->0) & $0002 ) / 2;
    top_object = #largest_object-255;

    dict_start = HDR_DICTIONARY-->0;
    dict_entry_size = dict_start->(dict_start->0 + 1);
    dict_start = dict_start + dict_start->0 + 4;
    dict_end = dict_start + (dict_start - 2)-->0 * dict_entry_size;
    #Ifdef DEBUG;
    if (dict_start > 0 && dict_end < 0 &&
      ((-dict_start) - dict_end) % dict_entry_size == 0)
        print "** Warning: grammar properties might not work correctly **^";
    #Endif; ! DEBUG

    buffer->0  = INPUT_BUFFER_LEN - WORDSIZE;
    buffer2->0 = INPUT_BUFFER_LEN - WORDSIZE;
    buffer3->0 = INPUT_BUFFER_LEN - WORDSIZE;
    parse->0   = MAX_BUFFER_WORDS;
    parse2->0  = MAX_BUFFER_WORDS;
];

#Ifnot; ! TARGET_GLULX;

[ GGInitialise res;
    @gestalt 4 2 res; ! Test if this interpreter has Glk.
    if (res == 0) {
      ! Without Glk, we're entirely screwed.
      quit;
    }
    ! Set the VM's I/O system to be Glk.
    @setiosys 2 0;

    ! First, we must go through all the Glk objects that exist, and see
    ! if we created any of them. One might think this strange, since the
    ! program has just started running, but remember that the player might
    ! have just typed "restart".

    GGRecoverObjects();
    res = InitGlkWindow(0);
    if (res == false) res = LibraryExtensions.RunWhile(ext_InitGlkWindow, 0, 0);
    if (res) return;

    ! Now, gg_mainwin and gg_storywin might already be set. If not, set them.

    if (gg_mainwin == 0) {
        ! Open the story window.
        res = InitGlkWindow(GG_MAINWIN_ROCK);
        if (res == false) res = LibraryExtensions.RunWhile(ext_InitGlkWindow, 0, GG_MAINWIN_ROCK);
        if (res == false)
            gg_mainwin = glk_window_open(0, 0, 0, 3, GG_MAINWIN_ROCK);
        if (gg_mainwin == 0) {
            ! If we can't even open one window, there's no point in going on.
            quit;
        }
    }
    else {
        ! There was already a story window. We should erase it.
        glk_window_clear(gg_mainwin);
    }

    if (gg_statuswin == 0) {
        res = InitGlkWindow(GG_STATUSWIN_ROCK);
        if (res == false) res = LibraryExtensions.RunWhile(ext_InitGlkWindow, 0, GG_STATUSWIN_ROCK);
        if (res == false) {
            gg_statuswin_cursize = gg_statuswin_size;
            gg_statuswin = glk_window_open(gg_mainwin, $12,
                gg_statuswin_cursize, 4, GG_STATUSWIN_ROCK);
        }
    }
    ! It's possible that the status window couldn't be opened, in which case
    ! gg_statuswin is now zero. We must allow for that later on.

    glk_set_window(gg_mainwin);

    if (InitGlkWindow(1) == false) LibraryExtensions.RunWhile(ext_InitGlkWindow, 0, 1);
];

[ GGRecoverObjects id;
    ! If GGRecoverObjects() has been called, all these stored IDs are
    ! invalid, so we start by clearing them all out.
    ! (In fact, after a restoreundo, some of them may still be good.
    ! For simplicity, though, we assume the general case.)
    gg_mainwin = 0;
    gg_statuswin = 0;
    gg_quotewin = 0;
    gg_scriptfref = 0;
    gg_scriptstr = 0;
    gg_savestr = 0;
    gg_statuswin_cursize = 0;
    gg_commandstr = 0;
    gg_command_reading = false;
    ! Also tell the game to clear its object references.
    if (IdentifyGlkObject(0) == false) LibraryExtensions.RunWhile(ext_identifyglkobject, 0, 0);

    id = glk_stream_iterate(0, gg_arguments);
    while (id) {
        switch (gg_arguments-->0) {
            GG_SAVESTR_ROCK: gg_savestr = id;
            GG_SCRIPTSTR_ROCK: gg_scriptstr = id;
            GG_COMMANDWSTR_ROCK: gg_commandstr = id;
                                 gg_command_reading = false;
            GG_COMMANDRSTR_ROCK: gg_commandstr = id;
                                 gg_command_reading = true;
            default: if (IdentifyGlkObject(1, 1, id, gg_arguments-->0) == false)
                         LibraryExtensions.RunWhile(ext_identifyglkobject, false, 1, 1, id, gg_arguments-->0);
        }
        id = glk_stream_iterate(id, gg_arguments);
    }

    id = glk_window_iterate(0, gg_arguments);
    while (id) {
        switch (gg_arguments-->0) {
            GG_MAINWIN_ROCK: gg_mainwin = id;
            GG_STATUSWIN_ROCK: gg_statuswin = id;
            GG_QUOTEWIN_ROCK: gg_quotewin = id;
            default: if (IdentifyGlkObject(1, 0, id, gg_arguments-->0) == false)
                        LibraryExtensions.RunWhile(ext_identifyglkobject, false, 1, 0, id, gg_arguments-->0);
        }
        id = glk_window_iterate(id, gg_arguments);
    }

    id = glk_fileref_iterate(0, gg_arguments);
    while (id) {
        switch (gg_arguments-->0) {
            GG_SCRIPTFREF_ROCK: gg_scriptfref = id;
            default: if (IdentifyGlkObject(1, 2, id, gg_arguments-->0) == false)
                        LibraryExtensions.RunWhile(ext_identifyglkobject, false, 1, 2, id, gg_arguments-->0);
        }
        id = glk_fileref_iterate(id, gg_arguments);
    }

    ! Tell the game to tie up any loose ends.
    if (IdentifyGlkObject(2) == false)
        LibraryExtensions.RunWhile(ext_identifyglkobject, 0, 2);
];

! This somewhat obfuscated function will print anything.
! It handles strings, functions (with optional arguments), objects,
! object properties (with optional arguments), and dictionary words.
! It does *not* handle plain integers, but you can use
! DecimalNumber or EnglishNumber to handle that case.
!
! Calling:                           Is equivalent to:
! -------                            ----------------
! PrintAnything()                    <nothing printed>
! PrintAnything(0)                   <nothing printed>
! PrintAnything("string");           print (string) "string";
! PrintAnything('word')              print (address) 'word';
! PrintAnything(obj)                 print (name) obj;
! PrintAnything(obj, prop)           obj.prop();
! PrintAnything(obj, prop, args...)  obj.prop(args...);
! PrintAnything(func)                func();
! PrintAnything(func, args...)       func(args...);

[ PrintAnything _vararg_count obj mclass;
    print_anything_result = 0;
    if (_vararg_count == 0) return;
    @copy sp obj;
    _vararg_count--;
    if (obj == 0) return;

    if (obj->0 == $60) {
        ! Dictionary word. Metaclass() can't catch this case, so we do
        ! it manually.
        print (address) obj;
        return;
    }

    mclass = metaclass(obj);
    switch (mclass) {
      nothing:
        return;
      String:
        print (string) obj;
        return;
      Routine:
        ! Call the function with all the arguments which are already
        ! on the stack.
        @call obj _vararg_count print_anything_result;
        return;
      Object:
        if (_vararg_count == 0) {
            print (name) obj;
        }
        else {
            ! Push the object back onto the stack, and call the
            ! veneer routine that handles obj.prop() calls.
            @copy obj sp;
            _vararg_count++;
            @call CA__Pr _vararg_count print_anything_result;
        }
        return;
    }
];

! This does the same as PrintAnything, but the output is sent to a
! byte array in memory. The first two arguments must be the array
! address and length; the following arguments are interpreted as
! for PrintAnything. The return value is the number of characters
! output.
! If the output is longer than the array length given, the extra
! characters are discarded, so the array does not overflow.
! (However, the return value is the total length of the output,
! including discarded characters.)

[ PrintAnyToArray _vararg_count arr arrlen str oldstr len;
    @copy sp arr;
    @copy sp arrlen;
    _vararg_count = _vararg_count - 2;

    oldstr = glk_stream_get_current(); ! stream_get_current
    str = glk_stream_open_memory(arr, arrlen, 1, 0);
    if (str == 0) return 0;

    glk_stream_set_current(str);

    @call PrintAnything _vararg_count 0;

    glk_stream_set_current(oldstr);
    @copy $ffffffff sp;
    @copy str sp;
    @glk $0044 2 0;
    @copy sp len;
    @copy sp 0;

    return len;
];

! And this calls PrintAnyToArray on a particular array, jiggering
! the result to be a Glulx C-style ($E0) string.

Constant GG_ANYTOSTRING_LEN 66;
Array AnyToStrArr -> GG_ANYTOSTRING_LEN+1;

[ ChangeAnyToCString _vararg_count ix len;
    ix = GG_ANYTOSTRING_LEN-2;
    @copy ix sp;
    ix = AnyToStrArr+1;
    @copy ix sp;
    ix = _vararg_count+2;
    @call PrintAnyToArray ix len;
    AnyToStrArr->0 = $E0;
    if (len >= GG_ANYTOSTRING_LEN)
        len = GG_ANYTOSTRING_LEN-1;
    AnyToStrArr->(len+1) = 0;
    return AnyToStrArr;
];

#Endif; ! TARGET_

! This is a trivial function which just prints a number, in decimal
! digits. It may be useful as a stub to pass to PrintAnything.

[ DecimalNumber num; print num; ];

#Ifndef SHORTNAMEBUF_LEN;               ! Can't use 'Default', unfortunately,
Constant SHORTNAMEBUF_LEN 160;          ! but this is functionally equivalent
#Endif;

#IfV5;
#Ifdef VN_1630;
Array StorageForShortName buffer SHORTNAMEBUF_LEN;
#Ifnot;
Array StorageForShortName -> WORDSIZE + SHORTNAMEBUF_LEN;
#Endif; ! VN_1630

#Endif; ! V5

#Ifdef TARGET_ZCODE;

! Platform-independent way of printing strings, routines and properties
! to a buffer (defined as length word followed by byte characters).

[ PrintToBuffer buf len a b c d e;
    print_anything_result = 0;
    @output_stream 3 buf;
    switch (metaclass(a)) {
      String:
        print (string) a;
      Routine:
        print_anything_result = a(b, c, d, e);
      Object,Class:
        if (b)
            print_anything_result = PrintOrRun(a, b, true);
        else
            print (name) a;
    }
    @output_stream -3;
    if (buf-->0 > len) RunTimeError(14, len, "in PrintToBuffer()");
    return buf-->0;
];

#Ifnot; ! TARGET_GLULX

[ PrintToBuffer buf len a b c d e;
    if (b) {
        if (metaclass(a) == Object && a.#b == WORDSIZE
            && metaclass(a.b) == String)
            buf-->0 = PrintAnyToArray(buf+WORDSIZE, len, a.b);
        else
            buf-->0 = PrintAnyToArray(buf+WORDSIZE, len, a, b, c, d, e);
    }
    else
        buf-->0 = PrintAnyToArray(buf+WORDSIZE, len, a);
    if (buf-->0 > len) buf-->0 = len;
    return buf-->0;
];

#Endif; ! TARGET_

! Print contents of buffer (defined as length word followed by byte characters).
! no_break == 1: omit trailing newline.
! set_case == 1: capitalise first letter;
!          == 2: capitalise first letter, remainder lower case;
!          == 3: all lower case;
!          == 4: all upper case.
! centred == 1:  add leading spaces.

[ PrintFromBuffer buf no_break set_case centred
    i j k;
    j = (buf-->0) - 1;
    if (buf->(j+WORDSIZE) ~= 10 or 13) j++;     ! trim any trailing newline
    if (centred) {
        k = (ScreenWidth() - j) / 2;
        if (k>0) spaces k;
    }
    for (i=0 : i<j : i++) {
        k = buf->(WORDSIZE+i);
        switch (set_case) {
          0:    break;
          1:    if (i) set_case = 0;
                else   k = UpperCase(k);
          2:    if (i) k = LowerCase(k);
                else   k = UpperCase(k);
          3:           k = LowerCase(k);
          4:           k = UpperCase(k);
        }
        print (char) k;
    }
    if (no_break == false) new_line;
    return j;
];

! None of the following functions should be called for zcode if the
! output exceeds the size of the buffer.

[ StringSize a b c d e;
    PrintToBuffer(StorageForShortName, 160, a, b, c, d, e);
    return StorageForShortName-->0;
];

[ PrintCapitalised a b no_break no_caps centred;
    if (metaclass(a) == Routine or String || b == 0 || metaclass(a.b) == Routine or String)
        PrintToBuffer(StorageForShortName, SHORTNAMEBUF_LEN, a, b);
    else
        if (a.b == NULL) rfalse;
        else             return RunTimeError(2, a, b);
    if (no_caps == 0 or 1) no_caps = ~~no_caps;
    PrintFromBuffer(StorageForShortName, no_break, no_caps, centred);
    return print_anything_result;
];

[ Centre a b;
    PrintCapitalised(a, b, false, true, true);
];

[ Cap str no_caps;
    if (no_caps) print (string) str;
    else         PrintCapitalised(str,0,true);
];

[ PrefaceByArticle o acode pluralise capitalise  i artform findout artval;
    if (o provides articles) {
        artval=(o.&articles)-->(acode+short_name_case*LanguageCases);
        if (capitalise)
            print (Cap) artval;
        else
            print (string) artval;
        if (pluralise) return;
        print (PSN__) o; return;
    }

    i = GetGNAOfObject(o);
    if (pluralise) {
        if (i < 3 || (i >= 6 && i < 9)) i = i + 3;
    }
    i = LanguageGNAsToArticles-->i;

    artform = LanguageArticles
        + 3*WORDSIZE*LanguageContractionForms*(short_name_case + i*LanguageCases);

    #Iftrue (LanguageContractionForms == 2);
    if (artform-->acode ~= artform-->(acode+3)) findout = true;
    #Endif; ! LanguageContractionForms
    #Iftrue (LanguageContractionForms == 3);
    if (artform-->acode ~= artform-->(acode+3)) findout = true;
    if (artform-->(acode+3) ~= artform-->(acode+6)) findout = true;
    #Endif; ! LanguageContractionForms
    #Iftrue (LanguageContractionForms == 4);
    if (artform-->acode ~= artform-->(acode+3)) findout = true;
    if (artform-->(acode+3) ~= artform-->(acode+6)) findout = true;
    if (artform-->(acode+6) ~= artform-->(acode+9)) findout = true;
    #Endif; ! LanguageContractionForms
    #Iftrue (LanguageContractionForms > 4);
    findout = true;
    #Endif; ! LanguageContractionForms

    #Ifdef TARGET_ZCODE;
    if (standard_interpreter && findout) {
        StorageForShortName-->0 = SHORTNAMEBUF_LEN;
        @output_stream 3 StorageForShortName;
        if (pluralise) print (number) pluralise; else print (PSN__) o;
        @output_stream -3;
        acode = acode + 3*LanguageContraction(StorageForShortName + 2);
    }
    #Ifnot; ! TARGET_GLULX
    if (findout) {
        if (pluralise)
            PrintAnyToArray(StorageForShortName, SHORTNAMEBUF_LEN, EnglishNumber, pluralise);
        else
            PrintAnyToArray(StorageForShortName, SHORTNAMEBUF_LEN, PSN__, o);
        acode = acode + 3*LanguageContraction(StorageForShortName);
    }
    #Endif; ! TARGET_

    Cap (artform-->acode, ~~capitalise); ! print article
    if (pluralise) return;
    print (PSN__) o;
];

[ PSN__ o;
    if (o == 0) { print (string) NOTHING__TX; rtrue; }
    switch (metaclass(o)) {
      Routine:  print "<routine ", o, ">"; rtrue;
      String:   print "<string ~", (string) o, "~>"; rtrue;
      nothing:  print "<illegal object number ", o, ">"; rtrue;
    }
    #Ifdef LanguagePrintShortName;
    if (LanguagePrintShortName(o)) rtrue;
    #Endif; ! LanguagePrintShortName
    if (indef_mode && o.&short_name_indef ~= 0 && PrintOrRun(o, short_name_indef, 1) ~= 0) rtrue;
    if (o.&short_name ~= 0 && PrintOrRun(o, short_name, 1) ~= 0) rtrue;
    print (object) o;
];

[ Indefart o saveIndef;
    saveIndef = indef_mode; indef_mode = true; caps_mode = false;
    if (o has proper) {
        indef_mode = NULL;
        print (PSN__) o;
        indef_mode = saveIndef;
        return;
    }

    if (o provides article) {
        PrintOrRun(o, article, 1);
        print " ", (PSN__) o;
        indef_mode = saveIndef;
        return;
    }
    PrefaceByArticle(o, 2);
    indef_mode = saveIndef;
];

[ CInDefArt o saveIndef saveCaps;
    saveIndef = indef_mode; indef_mode = true;
    saveCaps = caps_mode; caps_mode = true;

    if (o has proper) {
        indef_mode = NULL;
        PrintToBuffer(StorageForShortName, SHORTNAMEBUF_LEN, PSN__, o);
        PrintFromBuffer(StorageForShortName, true, caps_mode);
        caps_mode = saveCaps;
        return;
    }

    if (o provides article) {
        PrintCapitalised(o, article, true);
        print " ", (PSN__) o;
        indef_mode = saveIndef;
        caps_mode = saveCaps;
        return;
    }
    PrefaceByArticle(o, 2, 0, 1);
    caps_mode = saveCaps;
    indef_mode = saveIndef;
];

[ Defart o saveIndef;
    saveIndef = indef_mode;
    indef_mode = false;
    caps_mode = false;
    if ((~~o ofclass Object) || o has proper) {
        indef_mode = NULL;
        if (o == player) {
            if (player provides narrative_voice) {
                switch (player.narrative_voice) {
                  1:  print (string) MYSELF__TX;
                  2:  print (string) YOURSELF__TX;
                  3:  print (PSN__) o;
                  default: RunTimeError(16, player.narrative_voice);
                }
            }
            else ThatOrThose(player);
        } else {
            print (PSN__) o;
        }
        indef_mode = saveIndef;
        return;
    }
    PrefaceByArticle(o, 1);
    indef_mode = saveIndef;
];

[ CDefart o saveIndef saveCaps;
    saveIndef = indef_mode; indef_mode = false;
    saveCaps = caps_mode; caps_mode = true;
    if (~~o ofclass Object) {
        indef_mode = NULL; print (PSN__) o;
    }
    else
        if (o has proper) {
            indef_mode = NULL;
            PrintToBuffer(StorageForShortName, SHORTNAMEBUF_LEN, PSN__, o);
            PrintFromBuffer(StorageForShortName, true, caps_mode);
        }
        else
            PrefaceByArticle(o, 0);
    indef_mode = saveIndef; caps_mode = saveCaps;
];

[ PrintShortName o saveIndef;
    saveIndef = indef_mode; indef_mode = NULL;
    PSN__(o); indef_mode = saveIndef;
];

[ EnglishNumber n; LanguageNumber(n); ];

[ SerialComma n;
    #Ifdef SERIAL_COMMAS;
    if (n>2) print ",";
    #Endif;
    n=0;        ! quell unused n variable warning
];

[ NumberWord o i n;
    n = LanguageNumbers-->0;
    for (i=1 : i<=n : i=i+2)
        if (o == LanguageNumbers-->i) return LanguageNumbers-->(i+1);
    return 0;
];

[ RandomEntry tab;
    if (tab-->0 == 0) return RunTimeError(8);
    return tab-->(random(tab-->0));
];

! ----------------------------------------------------------------------------
!  Useful routine: unsigned comparison (for addresses in Z-machine)
!    Returns 1 if x>y, 0 if x=y, -1 if x<y
! ----------------------------------------------------------------------------

[ UnsignedCompare x y u v;
    if (x == y) return 0;
    if (x < 0 && y >= 0) return 1;
    if (x >= 0 && y < 0) return -1;
    u = x&~WORD_HIGHBIT; v= y&~WORD_HIGHBIT;
    if (u > v) return 1;
    return -1;
];

! ==============================================================================

#Ifdef NITFOL_HOOKS;          ! Code contributed by Evin Robertson
#Ifdef TARGET_GLULX;          ! Might be nice for Z-machine games too,
                              ! but I'm not going to try to make this work
                              ! given #Ifdef funniness.

Array magic_array -->         ! This is so nitfol can do typo correction /
                              ! automapping / debugging on Glulx games
    $6e66726d $4d616763 $ff0010 ! Goes to 'NfrmMagc'  10 refers to length
    Magic_Global_Dispatch__
    DI__check_word            ! DI__check_word(buf, length)
    PrintShortName
    WV__Pr RV__Pr CA__Pr      ! obj.prop = x; x = obj.prop; obj.prop(x)
    RA__Pr RL__Pr RA__Sc      ! obj.&prop; obj.#prop; class::prop
    OP__Pr OC__Cl             ! obj provides prop; obj ofclass class
    OB__Move OB__Remove
    OB__Parent__ OB__Child__ OB__Sibling__  ! No explicit veneer for these
    ;

[ OB__Parent__ obj; return parent(obj); ];

[ OB__Child__ obj; return child(obj); ];

[ OB__Sibling__ obj; return sibling(obj); ];

[ Magic_Global_Dispatch__ glbl;
    switch (glbl) {
      0:
        if (location == TheDark) return real_location; return location;
      1:
        return Player;
      -1:
        return CompassDirection::number; ! Silliness to make exist RA__Sc
                                         ! Should never be called.
    }
    return magic_array;       ! Silences a warning.
];

[ DI__check_word buf wlen  ix val res dictlen entrylen;
    ! Just like in Tokenise__.  In fact, Tokenise__ could call this if
    ! it wanted, instead of doing this itself.
    if (wlen > DICT_WORD_SIZE) wlen = DICT_WORD_SIZE;
    for (ix=0 : ix<wlen : ix++) {
        gg_tokenbuf->ix = glk_char_to_lower(buf->ix);
    }
    for (: ix<DICT_WORD_SIZE : ix++) {
        gg_tokenbuf->ix = 0;
    }
    val = #dictionary_table + WORDSIZE;
    entrylen = DICT_WORD_SIZE + 7;
    @binarysearch gg_tokenbuf DICT_WORD_SIZE val entrylen dictlen 1 1 res;
    return res;
];

#Endif; ! TARGET_
#Endif; ! NITFOL_HOOKS

! ==============================================================================

Object  LibraryExtensions "(Library Extensions)"
  with  RunAll [ prop a1 a2 a3
            obj rval max;
            objectloop (obj in self)
                if (obj provides prop && obj.prop ofclass Routine) {
                    rval = obj.prop(a1, a2, a3);
                    if (rval > max) max = rval;
                    if (self.BetweenCalls) self.BetweenCalls();
                }
            return max;
        ],
        RunUntil [ prop exitval a1 a2 a3
            obj rval;
            objectloop (obj in self)
                if (obj provides prop && obj.prop ofclass Routine) {
                    rval = obj.prop(a1, a2, a3);
                    if (rval == exitval) return rval;
                    if (self.BetweenCalls) self.BetweenCalls();
                }
            return ~~exitval;
        ],
        RunWhile [ prop exitval a1 a2 a3
            obj rval;
            objectloop (obj in self)
                if (obj provides prop && obj.prop ofclass Routine) {
                    rval = obj.prop(a1, a2, a3);
                    if (rval ~= exitval) return rval;
                    if (self.BetweenCalls) self.BetweenCalls();
                }
            return exitval;
        ],

        ext_number_1 0, ! general temporary workspace

        ! can be set to a function (e.g. RestoreWN) meant for execution
        ! after non-terminating calls to extension objects
        ! (via RunUntil/While/All)
        BetweenCalls 0,
        RestoreWN [; wn = self.ext_number_1; ],

        ! Special interception points
        ext_messages            0,  ! Called if LibraryMessages.before()
                                    !    returns false
                                    ! Extensions run while they return false

        ! Cross-platform entry points
        !                             Called/Runs
        ext_afterlife           0,  ! [C2/R1]
        ext_afterprompt         0,  ! [C2/R1]
        ext_amusing             0,  ! [C2/R1]
        ext_beforeparsing       0,  ! [C2/R2]
        ext_chooseobjects       0,  ! [C2/R2]
        ext_darktodark          0,  ! [C2/R1]
        ext_deathmessage        0,  ! [C2/R1]
        ext_gamepostroutine     0,  ! [C2/R2]
        ext_gamepreroutine      0,  ! [C2/R2]
        ext_initialise          0,  ! [C1/R1]
        ext_inscope             0,  ! [C2/R2]
        ext_lookroutine         0,  ! [C2/R1]
        ext_newroom             0,  ! [C2/R1]
        ext_objectdoesnotfit    0,  ! [C2/R2]
        ext_parsenoun           0,  ! [C3/R3]
        ext_parsenumber         0,  ! [C2/R2]
        ext_parsererror         0,  ! [C2/R2]
        ext_printrank           0,  ! [C2/R1]
        ext_printtaskname       0,  ! [C2/R1]
        ext_printverb           0,  ! [C2/R2]
        ext_timepasses          0,  ! [C2/R1]
        ext_unknownverb         0,  ! [C2/R2]
        ext_aftersave           0,  ! [C2/R2]
        ext_afterrestore        0,  ! [C2/R2]
        !                             [C1] = Called in all cases
        !                             [C2] = Called if EP is undefined, or returns false
        !                             [C3] = called if EP is undefined, or returns -1
        !                             [R1] = All extensions run
        !                             [R2] = Extensions run while they return false
        !                             [R3] = Extensions run while they return -1

        #Ifdef TARGET_GLULX;
        ! Glulx entry points
        !                             Called:           Runs:
        ext_handleglkevent      0,  ! if EP undefined   while extensions return false
        ext_identifyglkobject   0,  ! if EP undefined   while extensions return false
        ext_initglkwindow       0,  ! if EP undefined   while extensions return false
        #Endif; ! TARGET_GLULX;

  has   proper;

! ==============================================================================

Undef LIBRARY_STAGE; Constant LIBRARY_STAGE = AFTER_PARSER;

#Ifnot;
Message "Warning: 'parser' included twice; ignoring second inclusion. (Ignore this if this is on purpose.)";
#Endif;
! ==============================================================================