197 lines
6.8 KiB
Racket
197 lines
6.8 KiB
Racket
#lang racket/base
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(provide this-turn
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this-facet
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this-actor
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action
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entity
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actor-system
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with-fresh-turn
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ref
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react
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define-field
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stop-facet
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stop-current-facet
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on-start
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on-stop
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sync!
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send!
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spawn
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begin/dataflow
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define/dataflow
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this-target
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at
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assert
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(rename-out [event:when when])
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during)
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(require racket/match)
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(require racket/stxparam)
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(require (for-syntax racket/base))
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(require (for-syntax racket/syntax))
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(require "actor.rkt")
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(require (prefix-in actor: "actor.rkt"))
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(require "event-expander.rkt")
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(require "pattern.rkt")
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(define-syntax-parameter this-turn
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(lambda (stx)
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(raise-syntax-error #f "Illegal use outside an Actor turn" stx)))
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(define-syntax-rule (with-this-turn id expr ...)
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(syntax-parameterize ([this-turn (make-rename-transformer #'id)])
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expr ...))
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(define-syntax this-facet
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(syntax-id-rules ()
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[_ (turn-active-facet this-turn)]))
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(define-syntax this-actor
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(syntax-id-rules ()
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[_ (facet-actor this-facet)]))
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(define-syntax-rule (action formals expr ...)
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(lambda (turn . formals)
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(with-this-turn turn expr ...)))
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(define-syntax-rule (actor-system expr ...)
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(actor:actor-system (action () expr ...)))
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(define-syntax-rule (with-fresh-turn expr ...)
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(turn-freshen this-turn (action () expr ...)))
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(define-syntax-rule (ref e)
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(turn-ref this-turn e))
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(define-syntax-rule (react setup-expr ...)
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(turn-facet! this-turn (action () setup-expr ...)))
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(define-syntax-rule (define-field id initial-value)
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(define id (turn-field! this-turn 'id initial-value)))
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(define-syntax stop-facet
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(syntax-rules ()
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[(_ f) (turn-stop! this-turn f)]
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[(_ f expr ...) (turn-stop! this-turn f (action () expr ...))]))
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(define-syntax-rule (stop-current-facet expr ...)
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(stop-facet this-facet expr ...))
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(define-syntax-rule (on-start expr ...)
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;; TODO: delay to end of turn (?)
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(begin expr ...))
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(define-syntax-rule (on-stop expr ...)
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(facet-on-stop! this-facet (action () expr ...)))
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(define-syntax-rule (sync! peer expr ...)
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(turn-sync! this-turn peer (action (_reply) expr ...)))
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(define-syntax-rule (send! peer assertion)
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(turn-message! this-turn peer assertion))
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(define-syntax-rule (spawn setup-expr ...)
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(turn-spawn! this-turn (action () setup-expr ...)))
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(define-syntax-rule (begin/dataflow expr ...)
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(turn-dataflow! this-turn (action () expr ...)))
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(define-syntax-rule (define/dataflow id expr)
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(begin (define-field id #f)
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(begin/dataflow (id expr))))
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;;---------------------------------------------------------------------------
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(define-for-syntax orig-insp
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(variable-reference->module-declaration-inspector (#%variable-reference)))
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(define-syntax-parameter this-target
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(lambda (stx)
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(raise-syntax-error #f "Illegal use outside an Actor turn" stx)))
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(define-syntax (at stx)
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(syntax-case stx ()
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[(_ target-expr items ...)
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#`(let ((target target-expr))
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(syntax-parameterize ([this-target (make-rename-transformer #'target)])
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#,@(for/list [(item-stx (in-list (syntax->list #'(items ...))))]
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(let loop ((item-stx item-stx))
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(define disarmed-item-stx (syntax-disarm item-stx orig-insp))
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(syntax-case disarmed-item-stx ()
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[(expander args ...)
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(event-expander-id? #'expander)
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(event-expander-transform disarmed-item-stx
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(lambda (r) (loop (syntax-rearm r item-stx))))]
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[_
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item-stx])))))]))
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(define-event-expander assert
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(syntax-rules ()
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[(_ expr)
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(turn-assert/dataflow! this-turn this-target (action () (:template expr)))]))
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(require "schemas/gen/dataspace.rkt")
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(define-event-expander event:when
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(lambda (stx)
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(syntax-case stx (message asserted)
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[(_ (message pat) expr ...)
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#`(assert (Observe (:pattern pat)
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(ref (entity #:message
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(action (bindings)
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(match-define (list #,@(analyse-pattern-bindings #'pat)) bindings)
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expr ...)))))]
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[(_ (asserted pat) expr ...)
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#`(assert (Observe (:pattern pat)
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(ref (entity #:assert
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(action (bindings _handle)
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(match-define (list #,@(analyse-pattern-bindings #'pat)) bindings)
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expr ...)))))]))
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(syntax-rules ()
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[(_ test expr ...)
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(when test expr ...)]))
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(define-event-expander during
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(lambda (stx)
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(syntax-case stx ()
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[(_ pat expr ...)
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#`(assert (Observe (:pattern pat)
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(ref (let ((assertion-map (make-hash)))
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(entity #:assert
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(action (bindings handle)
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(match-define (list #,(analyse-pattern-bindings #'pat)) bindings)
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(let ((facet (react
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(facet-prevent-inert-check! this-facet)
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expr ...)))
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(match (hash-ref assertion-map handle #f)
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[#f
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(hash-set! assertion-map handle facet)]
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['dead
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(hash-remove! assertion-map handle)
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(stop-facet facet)]
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[_
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(error 'during "Duplicate assertion handle ~a" handle)])))
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#:retract
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(action (handle)
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(match (hash-ref assertion-map handle #f)
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[#f
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(hash-set! assertion-map handle 'dead)]
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['dead
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(error 'during "Duplicate retraction handle ~a" handle)]
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[facet
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(hash-remove! assertion-map handle)
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(stop-facet facet)])))))))])))
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;;---------------------------------------------------------------------------
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;;; Local Variables:
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;;; eval: (put 'action 'scheme-indent-function 1)
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;;; eval: (put 'action 'racket-indent-function 1)
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;;; End:
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