463 lines
17 KiB
Racket
463 lines
17 KiB
Racket
#lang racket/base
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(provide actor
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observe-subscribers
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observe-advertisers
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advertise
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subscribe
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for/advertise
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for/subscribe
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define-transition
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begin-transition)
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;; (require (for-syntax racket/pretty))
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;; (require (for-syntax racket/trace))
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(require racket/set)
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(require racket/match)
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(require (for-syntax racket/match))
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(require (for-syntax racket/list))
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(require (for-syntax racket/base))
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(require (for-syntax syntax/stx))
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(require (for-syntax racket/stxparam))
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(require racket/stxparam)
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;; (require (for-syntax syntax/parse))
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(require "core.rkt")
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(require "gestalt.rkt")
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(define-syntax (actor stx)
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(syntax-case stx ()
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[(_ forms ...)
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(analyze-actor #f '() '() '() '() '() '() #'(forms ...))]))
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(define-syntax (observe-subscribers stx) (raise-syntax-error #f "Use of observe-subscribers outside actor form" stx))
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(define-syntax (observe-advertisers stx) (raise-syntax-error #f "Use of observe-advertisers outside actor form" stx))
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(define-syntax (advertise stx) (raise-syntax-error #f "Use of advertise outside actor form" stx))
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(define-syntax (subscribe stx) (raise-syntax-error #f "Use of subscribe outside actor form" stx))
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(define-syntax (for/advertise stx) (raise-syntax-error #f "Use of for/advertise outside actor form" stx))
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(define-syntax (for/subscribe stx) (raise-syntax-error #f "Use of for/subscribe outside actor form" stx))
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(define-syntax-parameter update-state-struct #f)
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(define-syntax-parameter match-state #f)
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(define-syntax-parameter compute-gestalt #f)
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(define-syntax-rule (define-transition head tail ...)
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(define head (begin-transition tail ...)))
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(define-syntax (begin-transition stx)
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(syntax-case stx ()
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[(_ forms ...)
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(let ()
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(define result (accumulate-actions (gensym 'begin-transition) '() '() #'(forms ...)))
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;; (pretty-print `(result ,(syntax->datum result)))
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result)]))
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(begin-for-syntax
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(struct observer (condition level meta-level presence-name set-name set-exp added-name removed-name) #:transparent)
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(struct participator (condition meta-level) #:transparent)
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(define (defbinding name-stx init-name-stx init-exp)
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(list #`(define #,init-name-stx #,init-exp)
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#`(define-syntax-parameter #,name-stx (syntax-id-rules () [_ #,init-name-stx]))))
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(define (analyze-actor actor-name
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states
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gestalt-observers
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gestalt-computers
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message-handlers
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action-ids
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body-forms
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forms-stx)
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(define-syntax-rule (analyze-body* self body-stx struct-type o [keyword accessor fieldname] ...)
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(syntax-case body-stx ()
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[(keyword v rest (... ...))
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(if (accessor o)
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(raise-syntax-error #f (format "duplicate ~a clause" 'keyword) body-stx)
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(self #'(rest (... ...)) (struct-copy struct-type o [fieldname #'v])))]
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...
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[other (values o #'other)]))
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(define (analyze-observer-body body-stx o)
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(analyze-body* analyze-observer-body body-stx observer o
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[#:when observer-condition condition]
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[#:level observer-level level]
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[#:meta-level observer-meta-level meta-level]
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[#:presence observer-presence-name presence-name]
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[#:name observer-set-name set-name]
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[#:set observer-set-exp set-exp]
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[#:added observer-added-name added-name]
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[#:removed observer-removed-name removed-name]))
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(define (analyze-participator-body body-stx p)
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(analyze-body* analyze-participator-body body-stx participator p
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[#:when participator-condition condition]
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[#:meta-level participator-meta-level meta-level]))
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(define (analyze-pattern pat-stx)
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(syntax-case pat-stx ($ quasiquote unquote quote)
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;; Extremely limited support for quasiquoting and quoting
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[(quasiquote (unquote p)) (analyze-pattern #'p)]
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[(quasiquote (p ...)) (analyze-pattern #'(list (quasiquote p) ...))]
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[(quasiquote p) (values #''p #''p #''p '())]
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[(quote p) (values #''p #''p #''p '())]
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[($ v)
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(values #'(?!)
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#'?
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#'v
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(list #'v))]
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[($ v p)
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(let ()
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(define-values (pr g m bs) (analyze-pattern #'p))
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(when (not (null? bs)) (raise-syntax-error #f "nested bindings not supported" pat-stx))
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(values #`(?! #,pr)
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g
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#`(and v #,m)
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(list #'v)))]
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[(ctor p ...)
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(let ()
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(define parts (if (identifier? #'ctor) #'(p ...) #'(ctor p ...)))
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(define-values (pr g m bs)
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(for/fold [(pr '()) (g '()) (m '()) (bs '())] [(p (syntax->list parts))]
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(define-values (pr1 g1 m1 bs1) (analyze-pattern p))
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(values (cons pr1 pr)
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(cons g1 g)
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(cons m1 m)
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(append bs1 bs))))
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(if (identifier? #'ctor)
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(values (cons #'ctor (reverse pr))
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(cons #'ctor (reverse g))
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(cons #'ctor (reverse m))
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bs)
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(values (reverse pr)
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(reverse g)
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(reverse m)
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bs)))]
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[non-pair
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(if (and (identifier? #'non-pair)
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(free-identifier=? #'non-pair #'?))
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(values #'?
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#'?
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#'_
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'())
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(values #'non-pair
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#'non-pair
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#'(== non-pair)
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'()))]))
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;; (trace analyze-pattern)
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(define (analyze-observation pat-stx body-stx pub? forms-stx)
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(define-values (o remaining-stx) (analyze-observer-body body-stx (observer #f #f #f #f #f #f #f #f)))
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(match-define (observer condition level meta-level presence-name set-name set-exp added-name removed-name) o)
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(when (and (not set-name) (or set-exp added-name removed-name))
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(define stx (or set-exp added-name removed-name))
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(raise-syntax-error #f "#:name is required when using #:set, #:added and/or #:removed" stx))
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(match-define (list presence-init set-init projector-name gestalt-name set-temp)
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(generate-temporaries (list presence-name set-name pat-stx pat-stx set-name)))
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(define-values (projector-stx gestalt-stx matcher-stx binders) (analyze-pattern pat-stx))
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(analyze-actor actor-name
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(append (if presence-name (list (list presence-name presence-init)) '())
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(if set-name (list (list set-name set-init)) '())
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states)
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(append (if presence-name
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(list (lambda (g-stx)
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#`(#:update [#,presence-name
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(not (gestalt-empty? (gestalt-filter #,g-stx #,gestalt-name)))])))
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'())
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(if (or set-name added-name removed-name)
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(list (lambda (g-stx)
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#`((define #,set-temp
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#,(if set-exp
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#`(for/set [(e (in-set
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(gestalt-project/keys #,g-stx #,projector-name)))]
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(match-define (list #,@binders) e)
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#,set-exp)
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#`(gestalt-project/keys #,g-stx #,projector-name)))
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#,@(if added-name
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#`((define #,added-name (set-subtract #,set-temp #,set-name)))
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#'())
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#,@(if removed-name
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#`((define #,removed-name (set-subtract #,set-name #,set-temp)))
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#'())
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#,@(if set-name
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#`(#:update [#,set-name #,set-temp])
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#'()))))
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'())
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(list (lambda (g-stx) remaining-stx))
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gestalt-observers)
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(append (if condition
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(list #`(if #,condition #,gestalt-name (gestalt-empty)))
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(list gestalt-name))
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gestalt-computers)
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message-handlers
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action-ids
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(cons #`(begin
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#,@(if presence-name (defbinding presence-name presence-init #'#f) #'())
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#,@(if set-name (defbinding set-name set-init #'(set)) #'())
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(define #,projector-name (#,(if pub? #'project-subs #'project-pubs) #,projector-stx
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#:level #,(or level 0) #:meta-level #,(or meta-level 0)))
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(define #,gestalt-name (projection->gestalt #,projector-name)))
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body-forms)
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forms-stx))
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(define (analyze-participation pat-stx body-stx pub? forms-stx)
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(define-values (p remaining-stx) (analyze-participator-body body-stx (participator #f #f)))
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(match-define (participator condition meta-level) p)
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(match-define (list gestalt-name) (generate-temporaries (list pat-stx)))
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(define-values (projector-stx gestalt-stx matcher-stx binders) (analyze-pattern pat-stx))
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(analyze-actor actor-name
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states
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gestalt-observers
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(append (if condition
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(list #`(if #,condition #,gestalt-name (gestalt-empty)))
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(list gestalt-name))
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gestalt-computers)
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(append (list (lambda (e-stx)
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#`[(message #,matcher-stx (== #,(or meta-level 0)) #,pub?)
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(begin-transition #,@remaining-stx)]))
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message-handlers)
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action-ids
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(cons #`(define #,gestalt-name (#,(if pub? #'pub #'sub) #,gestalt-stx
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#:meta-level #,(or meta-level 0)))
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body-forms)
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forms-stx))
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(define (analyze-group-participation loopspecs-stx pat-stx body-stx pub? forms-stx)
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(define-values (p remaining-stx) (analyze-participator-body body-stx (participator #f #f)))
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(match-define (participator condition meta-level) p)
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(match-define (list projector-name gestalt-name) (generate-temporaries (list pat-stx pat-stx)))
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(define-values (projector-stx gestalt-stx matcher-stx binders) (analyze-pattern pat-stx))
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(unless (stx-null? remaining-stx)
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(raise-syntax-error #f "for/advertise and for/subscribe cannot currently install message handlers"))
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(analyze-actor actor-name
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states
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gestalt-observers
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(append (list #`(gestalt-union* (for/list #,loopspecs-stx
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#,@(if condition
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#`(#:when #,condition)
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#'())
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(#,(if pub? #'pub #'sub) #,gestalt-stx
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#:meta-level #,meta-level))))
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gestalt-computers)
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message-handlers
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action-ids
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body-forms
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forms-stx))
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(define (accumulate-action action-stx forms-stx)
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(define temp (car (generate-temporaries (list action-stx))))
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(analyze-actor actor-name
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states
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gestalt-observers
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gestalt-computers
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message-handlers
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(cons temp action-ids)
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(cons #`(define #,temp #,action-stx) body-forms)
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forms-stx))
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(syntax-case forms-stx (observe-subscribers
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observe-advertisers
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advertise
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subscribe
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for/advertise
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for/subscribe)
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[()
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(let ((actor-name (or actor-name #'anonymous-actor)))
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(define state-struct-name
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(datum->syntax actor-name (string->symbol (format "~a-state" (syntax->datum actor-name)))))
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(match-define (list e-stx state-stx g-stx compute-gestalt-stx)
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(generate-temporaries (list #'event #'state #'gestalt #'compute-gestalt)))
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(define statevars (map car states))
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(define stateinits (map cadr states))
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(define result
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#`(let ()
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(struct #,state-struct-name (#,@statevars) #:prefab)
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#,@(reverse body-forms)
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(syntax-parameterize
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((update-state-struct (syntax-rules () [(_ v [n e] (... ...))
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(struct-copy #,state-struct-name v [n e] (... ...))]))
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(match-state (syntax-rules () [(_ id body (... ...))
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(match-lambda
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[(and id (struct #,state-struct-name (#,@stateinits)))
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(syntax-parameterize (#,@(for/list ([sv statevars] [si stateinits])
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#`(#,sv (syntax-id-rules () [_ #,si]))))
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body (... ...))])])))
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(let ((#,compute-gestalt-stx (match-state #,state-stx
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(gestalt-union #,@gestalt-computers)))
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(#,state-stx (#,state-struct-name #,@statevars)))
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(syntax-parameterize
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((compute-gestalt (syntax-rules () [(_ state) (#,compute-gestalt-stx state)])))
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(spawn #:boot (begin-transition #,@(reverse action-ids))
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(procedure-rename
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(lambda (#,e-stx #,state-stx)
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((match-state #,state-stx
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((match #,e-stx
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[(routing-update #,g-stx)
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(begin-transition
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#,@(append-map
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(lambda (p) (syntax->list (p g-stx)))
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gestalt-observers))]
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#,@(map (lambda (p) (p e-stx)) message-handlers)
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[_ (lambda (state) #f)])
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#,state-stx))
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#,state-stx))
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'#,actor-name)
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#,state-stx
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(#,compute-gestalt-stx #,state-stx)))))))
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;; (pretty-print `(result ,(syntax->datum result)))
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result)]
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[(#:name name rest ...) ;; TODO: named processes
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(let ()
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(when actor-name (raise-syntax-error #f "duplicate actor #:name" forms-stx))
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(unless (identifier? #'name) (raise-syntax-error #f "actor #:name must be an identifier" #'name))
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(analyze-actor #'name states gestalt-observers gestalt-computers message-handlers action-ids body-forms #'(rest ...)))]
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[(#:arguments [arg ...] rest ...) ;; TODO arguments
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(analyze-actor actor-name states gestalt-observers gestalt-computers message-handlers action-ids body-forms #'(rest ...))]
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[(#:state [statevar stateexp] rest ...)
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(let ()
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(match-define (list stateinit) (generate-temporaries (list #'statevar)))
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(analyze-actor actor-name
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(cons (list #'statevar stateinit) states)
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gestalt-observers
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gestalt-computers
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message-handlers
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action-ids
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(append (defbinding #'statevar stateinit #'stateexp) body-forms)
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#'(rest ...)))]
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[((observe-subscribers pat body ...) rest ...)
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(analyze-observation #'pat #'(body ...) #t #'(rest ...))]
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[((observe-advertisers pat body ...) rest ...)
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(analyze-observation #'pat #'(body ...) #f #'(rest ...))]
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[((advertise pat body ...) rest ...)
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(analyze-participation #'pat #'(body ...) #t #'(rest ...))]
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[((subscribe pat body ...) rest ...)
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(analyze-participation #'pat #'(body ...) #f #'(rest ...))]
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[((for/advertise [loopspec ...] pat body ...) rest ...)
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(analyze-group-participation #'(loopspec ...) #'pat #'(body ...) #t #'(rest ...))]
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[((for/subscribe [loopspec ...] pat body ...) rest ...)
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(analyze-group-participation #'(loopspec ...) #'pat #'(body ...) #f #'(rest ...))]
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[(expr rest ...)
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(syntax-case (expand-in-context (gensym 'actor-initialization) #'expr) ()
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[(head inner-rest ...)
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(if (or (free-identifier=? #'head #'begin)
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(free-identifier=? #'head #'begin-transition))
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(analyze-actor actor-name
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states
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gestalt-observers
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gestalt-computers
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message-handlers
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action-ids
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body-forms
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#'(inner-rest ... rest ...))
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(if (ormap (lambda (i) (free-identifier=? #'head i))
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(syntax->list #'(define-values define-syntaxes begin-for-syntax
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module module*
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#%module-begin
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#%require #%provide)))
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(analyze-actor actor-name
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states
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gestalt-observers
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gestalt-computers
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message-handlers
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action-ids
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(cons #'expr body-forms)
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#'(rest ...))
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(accumulate-action #'expr #'(rest ...))))]
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[non-pair-syntax (accumulate-action #'expr #'(rest ...))])]))
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(define (expand-in-context context-id stx)
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(local-expand stx
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(list context-id)
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(syntax->list #'(quote quote-syntax lambda case-lambda let-values letrec-values
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begin begin0 set! with-continuation-mark if #%app #%expression
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define-values define-syntaxes begin-for-syntax #%require #%provide
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#%variable-reference))))
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(define (accumulate-actions context-id action-ids final-forms forms)
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(syntax-case forms ()
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[()
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#`(match-state state
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#,@(reverse final-forms)
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(transition state (list #,@(reverse action-ids))))]
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[(#:run-transition exp rest ...)
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#`(match-state _state
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#,@(reverse final-forms)
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(sequence-transitions (transition state (list #,@(reverse action-ids)))
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exp
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(begin-transition rest ...)))]
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[(#:update [statevar stateval] rest ...)
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#`(match-state state
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#,@(reverse final-forms)
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(sequence-transitions (transition (update-state-struct state [statevar stateval])
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(list #,@(reverse action-ids)))
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(begin-transition rest ...)))]
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[(#:update-routes rest ...)
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#`(match-state state
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#,@(reverse final-forms)
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(sequence-transitions (transition state (list #,@(reverse action-ids)
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(routing-update (compute-gestalt state))))
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(begin-transition rest ...)))]
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[(expr rest ...)
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(syntax-case (expand-in-context context-id #'expr) ()
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[(head inner-rest ...)
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(if (or (free-identifier=? #'head #'begin)
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(free-identifier=? #'head #'begin-transition))
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(accumulate-actions context-id
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action-ids
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final-forms
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(append (syntax->list #'(inner-rest ...)) #'(rest ...)))
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(if (ormap (lambda (i) (free-identifier=? #'head i))
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(syntax->list #'(define-values define-syntaxes begin-for-syntax
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module module*
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#%module-begin
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#%require #%provide)))
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(accumulate-actions context-id
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action-ids
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(cons #'expr final-forms)
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#'(rest ...))
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(accumulate-action #'expr
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context-id
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action-ids
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final-forms
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|
#'(rest ...))))]
|
|
[non-pair-syntax
|
|
(accumulate-action #'expr
|
|
context-id
|
|
action-ids
|
|
final-forms
|
|
#'(rest ...))])]))
|
|
|
|
(define (accumulate-action action-stx context-id action-ids final-forms remaining-forms)
|
|
(define temp (car (generate-temporaries (list action-stx))))
|
|
(accumulate-actions context-id
|
|
(cons temp action-ids)
|
|
(cons #`(define #,temp #,action-stx) final-forms)
|
|
remaining-forms)))
|
|
|
|
;;; Local Variables:
|
|
;;; eval: (put 'begin-transition 'scheme-indent-function 0)
|
|
;;; eval: (put 'observe-subscribers 'scheme-indent-function 1)
|
|
;;; eval: (put 'observe-advertisers 'scheme-indent-function 1)
|
|
;;; eval: (put 'subscribe 'scheme-indent-function 1)
|
|
;;; eval: (put 'advertise 'scheme-indent-function 1)
|
|
;;; End:
|