mudsync/command.scm

   1 ;;; Mudsync --- Live hackable MUD
   2 ;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
   3 ;;;
   4 ;;; This file is part of Mudsync.
   5 ;;;
   6 ;;; Mudsync is free software; you can redistribute it and/or modify it
   7 ;;; under the terms of the GNU General Public License as published by
   8 ;;; the Free Software Foundation; either version 3 of the License, or
   9 ;;; (at your option) any later version.
  10 ;;;
  11 ;;; Mudsync is distributed in the hope that it will be useful, but
  12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 ;;; General Public License for more details.
  15 ;;;
  16 ;;; You should have received a copy of the GNU General Public License
  17 ;;; along with Mudsync.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 (define-module (mudsync command)
  20   #:use-module (mudsync parser)
  21   #:use-module (8sync actors)
  22   #:use-module (8sync rmeta-slot)
  23   #:use-module (srfi srfi-1)
  24   #:use-module (srfi srfi-9)
  25   #:use-module (ice-9 control)
  26   #:use-module (ice-9 match)
  27
  28   #:export (command?
  29             command-verbs
  30             command-matcher
  31             command-should-handle
  32             command-action
  33             command-priority
  34
  35             build-commands
  36
  37             direct-command
  38             prep-indir-command
  39             prep-direct-command
  40             loose-direct-command
  41             loose-prep-command
  42             empty-command
  43             direct-greedy-command
  44             greedy-command
  45             player-gather-command-handlers
  46             find-command-winner))
  47
  48 ;;; Commands
  49 ;;; ========
  50
  51 (define %low-priority 0)
  52 (define %default-priority 1)
  53 (define %high-priority 2)
  54
  55 ;; ;;; Avoiding some annoying issues crossing the continuation barrier
  56 ;; ;;; and the "@@" special form
  57 ;; (define (make-command verbs matcher should-handle action priority)
  58 ;;   (list '*command* verbs matcher should-handle action priority))
  59
  60 ;; (define command-verbs second)
  61 ;; (define command-matcher third)
  62 ;; (define command-should-handle fourth)
  63 ;; (define command-action fifth)
  64 ;; (define command-priority sixth)
  65
  66 (define-record-type <command>
  67   (make-command verbs matcher should-handle action priority)
  68   command?
  69   (verbs command-verbs)
  70   (matcher command-matcher)
  71   (should-handle command-should-handle)
  72   (action command-action)
  73   (priority command-priority))
  74
  75 (define-syntax %build-command
  76   (syntax-rules ()
  77     ((_ (verb ...) ((cmd-proc action-sym args ...) ...))
  78      (list (cons verb
  79                  (list (cmd-proc (list verb ...)
  80                                  (quote action-sym)
  81                                  args ...)
  82                        ...))
  83            ...))
  84     ((_ verb ((cmd-proc action-sym args ...) ...))
  85      (list (cons verb
  86                  (list (cmd-proc (list verb)
  87                                  (quote action-sym)
  88                                  args ...)
  89                        ...))))))
  90
  91 (define-syntax-rule (build-commands (verb-or-verbs cmd-defs ...) ...)
  92   (wrap-rmeta-slot
  93    (append (%build-command verb-or-verbs cmd-defs ...) ...)))
  94
  95
  96 (define (direct-command verbs action)
  97   (make-command verbs
  98                 cmatch-direct-obj
  99                 ;; @@: Should we allow fancier matching than this?
 100                 ;;   Let the actor itself pass along this whole method?
 101                 (lambda* (goes-by #:key direct-obj)
 102                   (member direct-obj goes-by))
 103                 action
 104                 %default-priority))
 105
 106 (define (loose-direct-command verbs action)
 107   (make-command verbs
 108                 cmatch-direct-obj
 109                 ;; @@: Should we allow fancier matching than this?
 110                 ;;   Let the actor itself pass along this whole method?
 111                 (const #t)
 112                 action
 113                 %default-priority))
 114
 115
 116 (define* (prep-indir-command verbs action #:optional prepositions)
 117   (make-command verbs
 118                 cmatch-indir-obj
 119                 (lambda* (goes-by #:key direct-obj indir-obj preposition)
 120                   (if prepositions
 121                       (and
 122                        (member indir-obj goes-by)
 123                        (member preposition prepositions))
 124                       (member indir-obj goes-by)))
 125                 action
 126                 %high-priority))
 127
 128 (define* (prep-direct-command verbs action #:optional prepositions)
 129   (make-command verbs
 130                 cmatch-indir-obj
 131                 (lambda* (goes-by #:key direct-obj indir-obj preposition)
 132                   (if prepositions
 133                       (and
 134                        (member  direct-obj goes-by)
 135                        (member preposition prepositions))
 136                       (member direct-obj goes-by)))
 137                 action
 138                 %high-priority))
 139
 140 (define* (loose-prep-command verbs action #:optional prepositions)
 141   (make-command verbs
 142                 cmatch-indir-obj
 143                 (const #t)
 144                 action
 145                 %high-priority))
 146
 147
 148 (define (empty-command verbs action)
 149   (make-command verbs
 150                 cmatch-empty
 151                 (const #t)
 152                 action
 153                 %low-priority))
 154
 155 (define (greedy-command verbs action)
 156   (make-command verbs
 157                 cmatch-greedy
 158                 (const #t)
 159                 action
 160                 %low-priority))
 161
 162 (define (direct-greedy-command verbs action)
 163   "greedy commands but which match the direct object"
 164   (make-command verbs
 165                 cmatch-direct-obj-greedy
 166                 (lambda* (goes-by #:key direct-obj rest)
 167                   (member direct-obj goes-by))
 168                 action
 169                 %low-priority))
 170
 171 ;; @@: We should probably ONLY allow these to go to users!
 172 (define* (custom-command verbs matcher should-handle action
 173                          #:optional (priority %default-priority))
 174   "Full-grained customizable command."
 175   (make-command verbs matcher should-handle action priority))