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@ -1,4 +1,4 @@
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#lang racket
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#lang br
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(provide define-verbs
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define-thing
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@ -7,9 +7,6 @@
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show-current-place
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show-inventory
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save-game
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load-game
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show-help
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have-thing?
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take-thing!
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@ -17,29 +14,27 @@
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thing-state
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set-thing-state!
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(except-out (all-from-out racket) #%module-begin)
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(except-out (all-from-out br) #%module-begin)
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(rename-out [module-begin #%module-begin]))
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;; ============================================================
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;; Overall module:
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(define-syntax module-begin
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(syntax-rules (define-verbs define-everywhere)
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[(_ (define-verbs all-verbs cmd ...)
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(define-everywhere everywhere-actions act ...)
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decl ...
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id)
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(#%module-begin
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(define-verbs all-verbs cmd ...)
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(define-everywhere everywhere-actions act ...)
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decl ...
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(init-game (check-type id "place")
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all-verbs
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everywhere-actions)
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(provide do-verb do-place)
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(module+ main
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(cmd-line-mode? #t)
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(do-place)))]))
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(define #'(module-begin (define-verbs _all-verbs _cmd ...)
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(define-everywhere _everywhere-actions _act ...)
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_decl ...
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_id)
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#'(#%module-begin
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(define-verbs _all-verbs _cmd ...)
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(define-everywhere _everywhere-actions _act ...)
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_decl ...
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(init-game (check-type _id "place")
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_all-verbs
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_everywhere-actions)
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(provide do-verb do-place)
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(module+ main
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(parameterize ([cmd-line-mode? #t])
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(do-place)))))
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;; ============================================================
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;; Model:
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@ -74,97 +69,91 @@
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#:property prop:procedure (λ (self stx) (typed-id self))
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#:omit-define-syntaxes))
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(define-syntax (check-type stx)
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(syntax-case stx ()
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[(_ id type)
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(let ([v (and (identifier? #'id)
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(syntax-local-value #'id (λ _ #f)))])
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(unless (and (typed? v)
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(equal? (syntax-e #'type) (typed-type v)))
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(raise-syntax-error
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#f
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(format "not defined as ~a" (syntax-e #'type))
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#'id))
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#'id)]))
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(define #'(check-type _id _type)
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(let ([v (and (identifier? #'_id)
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(syntax-local-value #'_id (λ () #f)))])
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(unless (and (typed? v)
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(equal? (syntax-e #'_type) (typed-type v)))
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(raise-syntax-error
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#f
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(format "not defined as ~a" (syntax-e #'_type))
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#'_id))
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#'_id))
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;; ============================================================
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;; Macros for constructing and registering elements:
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(define-syntax-rule (define-verbs all-id
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[id spec ...] ...)
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(begin
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(define-one-verb id spec ...) ...
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(record-element! 'id id) ...
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(define all-id (list id ...))))
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(define-syntax define-one-verb
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(syntax-rules (= _)
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[(define-one-verb id (= alias ...) desc)
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(begin
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(define gen-id (verb (list 'id 'alias ...) desc #f))
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(define-syntax id (typed #'gen-id "intransitive verb")))]
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[(define-one-verb id _ (= alias ...) desc)
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(begin
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(define gen-id (verb (list 'id 'alias ...) desc #t))
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(define-syntax id (typed #'gen-id "transitive verb")))]
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[(define-one-verb id)
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(define-one-verb id (=) (symbol->string 'id))]
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[(define-one-verb id _)
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(define-one-verb id _ (=) (symbol->string 'id))]))
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(define-syntax-rule (define-thing id
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[vrb expr] ...)
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(begin
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(define gen-id
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(thing 'id #f (list (cons (check-type vrb "transitive verb")
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(λ _ expr)) ...)))
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(define-syntax id (typed #'gen-id "thing"))
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(record-element! 'id id)))
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(define-syntax-rule (define-place id
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desc
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(thng ...)
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([vrb expr] ...))
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(begin
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(define gen-id
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(place desc
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(list (check-type thng "thing") ...)
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(list (cons (check-type vrb "intransitive verb")
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(λ _ expr))
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...)))
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(define-syntax id (typed #'gen-id "place"))
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(record-element! 'id id)))
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(define-syntax-rule (define-everywhere id ([vrb expr] ...))
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(define id (list (cons (check-type vrb "intransitive verb")
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(λ _ expr))
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...)))
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(define #'(define-verbs _all-id [_id _spec ...] ...)
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#'(begin
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(define-one-verb _id _spec ...) ...
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(record-element! '_id _id) ...
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(define _all-id (list _id ...))))
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;; todo: the underscore arguments in cases 2 & 4 should be literal underscores, not wildcards
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(define-cases #'define-one-verb
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[#'(_ _id (= _alias ...) _desc)
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#'(begin
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(define gen-id (verb (list '_id '_alias ...) _desc #f))
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(define-syntax _id (typed #'gen-id "intransitive verb")))]
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[#'(_ _id _ (= _alias ...) _desc)
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#'(begin
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(define gen-id (verb (list '_id '_alias ...) _desc #t))
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(define-syntax _id (typed #'gen-id "transitive verb")))]
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[#'(_ _id)
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#'(define-one-verb _id (=) (symbol->string '_id))]
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[#'(_ _id _)
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#'(define-one-verb _id _ (=) (symbol->string '_id))])
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(define #'(define-thing _id [_verb _expr] ...)
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#'(begin
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(define gen-id
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(thing '_id #f (list (cons (check-type _verb "transitive verb")
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(λ () _expr)) ...)))
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(define-syntax _id (typed #'gen-id "thing"))
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(record-element! '_id _id)))
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(define #'(define-place _id _desc (_thing ...) ([_verb _expr] ...))
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#'(begin
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(define gen-id
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(place _desc
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(list (check-type _thing "thing") ...)
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(list (cons (check-type _verb "intransitive verb")
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(λ () _expr))
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...)))
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(define-syntax _id (typed #'gen-id "place"))
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(record-element! '_id _id)))
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(define #'(define-everywhere _id ([_verb _expr] ...))
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#'(define _id (list (cons (check-type _verb "intransitive verb") (λ () _expr)) ...)))
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;; ============================================================
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;; Game state
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(define cmd-line-mode? (make-parameter #f))
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;; Initialized on startup:
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(define all-verbs null) ; list of verbs
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(define everywhere-actions null) ; list of verb--thunk pairs
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;; Things carried by the player:
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(define stuff null) ; list of things
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(define player-inventory null) ; list of things
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;; Current location:
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(define current-place #f) ; place (or #f until started)
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;; Fuctions to be used by verb responses:
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(define (have-thing? t)
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(memq t stuff))
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(define (take-thing! t)
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(set-place-things! current-place (remq t (place-things current-place)))
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(set! stuff (cons t stuff)))
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(define (drop-thing! t)
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(set-place-things! current-place (cons t (place-things current-place)))
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(set! stuff (remq t stuff)))
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(define (have-thing? thing)
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(memq thing player-inventory))
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(define (take-thing! thing)
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(set-place-things! current-place (remq thing (place-things current-place)))
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(set! player-inventory (cons thing player-inventory)))
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(define (drop-thing! thing)
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(set-place-things! current-place (cons thing (place-things current-place)))
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(set! player-inventory (remq thing player-inventory)))
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;; ============================================================
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;; Game execution
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@ -172,15 +161,14 @@
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;; Show the player the current place, then get a command:
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(define (do-place)
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(show-current-place)
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(when (cmd-line-mode?)
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(do-verb)))
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(when (cmd-line-mode?) (do-verb)))
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;; Show the current place:
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(define (show-current-place)
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(printf "~a\n" (place-desc current-place))
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(for-each (λ (thing)
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(printf "There is a ~a here.\n" (thing-name thing)))
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(place-things current-place)))
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(for-each
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(λ (thing) (printf "There is a ~a here.\n" (thing-name thing)))
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(place-things current-place)))
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;; Get and handle a command:
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@ -197,13 +185,13 @@
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(if (and (list? input)
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(andmap symbol? input)
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(<= 1 (length input) 2))
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(let* ([vrb (car input)]
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(let* ([verb (car input)]
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[response
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(cond
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[(= 2 (length input))
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(handle-transitive-verb vrb (cadr input))]
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(handle-transitive-verb verb (cadr input))]
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[(= 1 (length input))
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(handle-intransitive-verb vrb)])]
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(handle-intransitive-verb verb)])]
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[result (response)])
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(cond
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[(place? result)
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@ -225,15 +213,15 @@
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(using-verb
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verb all-verbs
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(λ (verb)
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(λ _ (if (verb-transitive? verb)
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(format "~a what?" (string-titlecase (verb-desc verb)))
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(format "Can't ~a here." (verb-desc verb))))))
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(λ _ (format "I don't know how to ~a." verb))))
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(λ () (if (verb-transitive? verb)
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(format "~a what?" (string-titlecase (verb-desc verb)))
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(format "Can't ~a here." (verb-desc verb))))))
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(λ () (format "I don't know how to ~a." verb))))
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;; Handle a transitive-verb command:
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(define (handle-transitive-verb vrb obj)
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(define (handle-transitive-verb verb-in obj)
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(or (using-verb
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vrb all-verbs
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verb-in all-verbs
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(λ (verb)
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(and
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(verb-transitive? verb)
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@ -242,25 +230,25 @@
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(and (eq? (thing-name thing) obj)
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thing))
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(append (place-things current-place)
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stuff))
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player-inventory))
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=> (λ (thing)
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(or (find-verb vrb (thing-actions thing))
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(λ _
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(or (find-verb verb-in (thing-actions thing))
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(λ ()
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(format "Don't know how to ~a ~a."
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(verb-desc verb) obj))))]
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[else
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(λ _ (format "There's no ~a here to ~a." obj
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(verb-desc verb)))]))))
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(λ _ (format "I don't know how to ~a ~a." vrb obj))))
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(λ () (format "There's no ~a here to ~a." obj
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(verb-desc verb)))]))))
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(λ () (format "I don't know how to ~a ~a." verb-in obj))))
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;; Show what the player is carrying:
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(define (show-inventory)
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(printf "You have")
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(if (null? stuff)
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(if (null? player-inventory)
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(printf " no items.")
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(for-each (λ (thing)
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(printf "\n a ~a" (thing-name thing)))
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stuff))
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player-inventory))
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(printf "\n"))
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;; Look for a command match in a list of verb--response pairs,
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@ -279,62 +267,6 @@
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(success-k vrb)))
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verbs))
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;; Print help information:
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(define (show-help)
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(printf "Use `look' to look around.\n")
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(printf "Use `inventory' to see what you have.\n")
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(printf "Use `save' or `load' to save or restore your game.\n")
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(printf "There are some other verbs, and you can name a thing after some verbs.\n"))
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;; ============================================================
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;; Save and load
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;; Prompt the user for a filename and apply `proc' to it,
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;; catching errors to report a reasonably nice message:
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(define (with-filename proc)
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(printf "File name: ")
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(flush-output)
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(let ([v (read-line)])
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(unless (eof-object? v)
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(with-handlers ([exn? (λ (exn)
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(printf "~a\n" (exn-message exn)))])
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(unless (path-string? v)
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(raise-user-error "bad filename"))
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(proc v)))))
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;; Save the current game state:
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(define (save-game)
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(with-filename
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(λ (v)
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(with-output-to-file v
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(λ _
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(write
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(list
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(map element->name stuff)
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(element->name current-place)
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(hash-map names
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(λ (k v)
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(cons k
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(cond
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[(place? v) (map element->name (place-things v))]
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[(thing? v) (thing-state v)]
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[else #f])))))))))))
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;; Restore a game state:
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(define (load-game)
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(with-filename
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(λ (v)
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(let ([v (with-input-from-file v read)])
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(set! stuff (map name->element (car v)))
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(set! current-place (name->element (cadr v)))
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(for-each
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(λ (p)
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(let ([v (name->element (car p))]
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[state (cdr p)])
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(cond
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[(place? v) (set-place-things! v (map name->element state))]
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[(thing? v) (set-thing-state! v state)])))
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(caddr v))))))
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;; ============================================================
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;; To go:
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