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 (srfi srfi-1)
  23   #:use-module (srfi srfi-9)
  24   #:use-module (ice-9 control)
  25   #:use-module (ice-9 match)
  26
  27   #:export (command?
  28             command-verbs
  29             command-matcher
  30             command-should-handle
  31             command-action
  32             command-priority
  33
  34             direct-command
  35             prep-indir-command
  36             prep-direct-command
  37             loose-direct-command
  38             loose-prep-command
  39             empty-command
  40             direct-greedy-command
  41             greedy-command
  42             player-gather-command-handlers
  43             find-command-winner))
  44
  45 ;;; Commands
  46 ;;; ========
  47
  48 (define %low-priority 0)
  49 (define %default-priority 1)
  50 (define %high-priority 2)
  51
  52 ;; ;;; Avoiding some annoying issues crossing the continuation barrier
  53 ;; ;;; and the "@@" special form
  54 ;; (define (make-command verbs matcher should-handle action priority)
  55 ;;   (list '*command* verbs matcher should-handle action priority))
  56
  57 ;; (define command-verbs second)
  58 ;; (define command-matcher third)
  59 ;; (define command-should-handle fourth)
  60 ;; (define command-action fifth)
  61 ;; (define command-priority sixth)
  62
  63 (define-record-type <command>
  64   (make-command verbs matcher should-handle action priority)
  65   command?
  66   (verbs command-verbs)
  67   (matcher command-matcher)
  68   (should-handle command-should-handle)
  69   (action command-action)
  70   (priority command-priority))
  71
  72
  73 (define (direct-command verbs action)
  74   (make-command verbs
  75                 cmatch-direct-obj
  76                 ;; @@: Should we allow fancier matching than this?
  77                 ;;   Let the actor itself pass along this whole method?
  78                 (lambda* (goes-by #:key direct-obj)
  79                   (member direct-obj goes-by))
  80                 action
  81                 %default-priority))
  82
  83 (define (loose-direct-command verbs action)
  84   (make-command verbs
  85                 cmatch-direct-obj
  86                 ;; @@: Should we allow fancier matching than this?
  87                 ;;   Let the actor itself pass along this whole method?
  88                 (const #t)
  89                 action
  90                 %default-priority))
  91
  92
  93 (define* (prep-indir-command verbs action #:optional prepositions)
  94   (make-command verbs
  95                 cmatch-indir-obj
  96                 (lambda* (goes-by #:key direct-obj indir-obj preposition)
  97                   (if prepositions
  98                       (and
  99                        (member indir-obj goes-by)
 100                        (member preposition prepositions))
 101                       (member indir-obj goes-by)))
 102                 action
 103                 %high-priority))
 104
 105 (define* (prep-direct-command verbs action #:optional prepositions)
 106   (make-command verbs
 107                 cmatch-indir-obj
 108                 (lambda* (goes-by #:key direct-obj indir-obj preposition)
 109                   (if prepositions
 110                       (and
 111                        (member  direct-obj goes-by)
 112                        (member preposition prepositions))
 113                       (member direct-obj goes-by)))
 114                 action
 115                 %high-priority))
 116
 117 (define* (loose-prep-command verbs action #:optional prepositions)
 118   (make-command verbs
 119                 cmatch-indir-obj
 120                 (const #t)
 121                 action
 122                 %high-priority))
 123
 124
 125 (define (empty-command verbs action)
 126   (make-command verbs
 127                 cmatch-empty
 128                 (const #t)
 129                 action
 130                 %low-priority))
 131
 132 (define (greedy-command verbs action)
 133   (make-command verbs
 134                 cmatch-greedy
 135                 (const #t)
 136                 action
 137                 %low-priority))
 138
 139 (define (direct-greedy-command verbs action)
 140   "greedy commands but which match the direct object"
 141   (make-command verbs
 142                 cmatch-direct-obj-greedy
 143                 (lambda* (goes-by #:key direct-obj rest)
 144                   (member direct-obj goes-by))
 145                 action
 146                 %low-priority))
 147
 148 ;; @@: We should probably ONLY allow these to go to users!
 149 (define* (custom-command verbs matcher should-handle action
 150                          #:optional (priority %default-priority))
 151   "Full-grained customizable command."
 152   (make-command verbs matcher should-handle action priority))