248 lines
7.4 KiB
Racket
248 lines
7.4 KiB
Racket
#lang typed/racket/base
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(require (for-syntax syntax/parse))
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(require (for-syntax racket/base))
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(require racket/match)
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(require (prefix-in core: "main.rkt"))
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(require "sugar-endpoints-support.rkt")
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(provide (all-from-out "sugar-endpoints-support.rkt")
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name-endpoint
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let-fresh
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observe-subscribers:
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observe-subscribers/everything:
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observe-publishers:
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observe-publishers/everything:
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publisher:
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subscriber:
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build-endpoint:)
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;; Must handle:
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;; - orientation
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;; - interest-type
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;; - let-name
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;; - naming of endpoints
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;; - state matching
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;; - conversation (and generally role) matching
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;; - presence event handling
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;; - absence event handling (including reason matching)
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;; - message event handling (including message matching)
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(: name-endpoint : (All (State) Any (core:AddEndpoint State) -> (core:AddEndpoint State)))
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(define (name-endpoint n e)
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(match e
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[(core:add-endpoint _ role handler)
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(core:add-endpoint (cast n core:PreEID) role handler)]))
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(define-syntax-rule (let-fresh (id ...) exp ...)
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(let ((id (gensym 'id)) ...) exp ...))
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(define-syntax-rule (observe-subscribers: State topic clause ...)
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(build-endpoint: State
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(gensym 'anonymous-endpoint)
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(core:role 'publisher (cast topic core:Topic) 'observer)
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clause ...))
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(define-syntax-rule (observe-subscribers/everything: State topic clause ...)
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(build-endpoint: State
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(gensym 'anonymous-endpoint)
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(core:role 'publisher (cast topic core:Topic) 'everything)
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clause ...))
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(define-syntax-rule (observe-publishers: State topic clause ...)
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(build-endpoint: State
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(gensym 'anonymous-endpoint)
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(core:role 'subscriber (cast topic core:Topic) 'observer)
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clause ...))
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(define-syntax-rule (observe-publishers/everything: State topic clause ...)
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(build-endpoint: State
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(gensym 'anonymous-endpoint)
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(core:role 'subscriber (cast topic core:Topic) 'everything)
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clause ...))
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(define-syntax-rule (publisher: State topic clause ...)
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(build-endpoint: State
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(gensym 'anonymous-endpoint)
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(core:role 'publisher (cast topic core:Topic) 'participant)
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clause ...))
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(define-syntax-rule (subscriber: State topic clause ...)
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(build-endpoint: State
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(gensym 'anonymous-endpoint)
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(core:role 'subscriber (cast topic core:Topic) 'participant)
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clause ...))
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(define-syntax build-endpoint:
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(lambda (stx)
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(define (combine-handler-clauses State
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clauses-stx
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stateful?
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state-stx
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orientation-stx
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conversation-stx
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interest-type-stx
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reason-stx)
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(define (do-tail new-clauses-stx)
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(combine-handler-clauses State
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new-clauses-stx
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stateful?
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state-stx
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orientation-stx
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conversation-stx
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interest-type-stx
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reason-stx))
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(define (stateful-lift context exprs-stx)
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(if stateful?
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(syntax-case exprs-stx ()
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[(expr)
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#`(lambda: ([state : #,State]) (match state [#,state-stx expr]))]
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[_
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(raise-syntax-error #f
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(format "Expected exactly one expression resulting in a transition, in ~a handler"
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context)
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stx
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exprs-stx)])
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(syntax-case exprs-stx ()
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[(expr ...)
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#`(lambda: ([state : #,State]) (core:transition state (list expr ...)))])))
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(syntax-case clauses-stx (match-state
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match-orientation
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match-conversation
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match-interest-type
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match-reason
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on-presence
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on-absence
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on-message)
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[() '()]
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[((match-state pat-stx inner-clause ...) outer-clause ...)
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(append (combine-handler-clauses State
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(syntax (inner-clause ...))
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#t
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#'pat-stx
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orientation-stx
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conversation-stx
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interest-type-stx
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reason-stx)
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(do-tail (syntax (outer-clause ...))))]
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[((match-orientation pat-stx inner-clause ...) outer-clause ...)
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(append (combine-handler-clauses State
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(syntax (inner-clause ...))
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stateful?
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state-stx
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#'pat-stx
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conversation-stx
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interest-type-stx
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reason-stx)
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(do-tail (syntax (outer-clause ...))))]
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[((match-conversation pat-stx inner-clause ...) outer-clause ...)
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(append (combine-handler-clauses State
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(syntax (inner-clause ...))
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stateful?
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state-stx
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orientation-stx
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#'pat-stx
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interest-type-stx
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reason-stx)
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(do-tail (syntax (outer-clause ...))))]
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[((match-interest-type pat-stx inner-clause ...) outer-clause ...)
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(append (combine-handler-clauses State
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(syntax (inner-clause ...))
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stateful?
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state-stx
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orientation-stx
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conversation-stx
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#'pat-stx
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reason-stx)
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(do-tail (syntax (outer-clause ...))))]
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[((match-reason pat-stx inner-clause ...) outer-clause ...)
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(append (combine-handler-clauses State
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(syntax (inner-clause ...))
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stateful?
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state-stx
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orientation-stx
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conversation-stx
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interest-type-stx
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#'pat-stx)
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(do-tail (syntax (outer-clause ...))))]
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[((on-presence expr ...) outer-clause ...)
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(cons #`[(core:presence-event (core:role #,orientation-stx
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#,conversation-stx
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#,interest-type-stx))
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#,(stateful-lift 'on-presence (syntax (expr ...)))]
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(do-tail (syntax (outer-clause ...))))]
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[((on-absence expr ...) outer-clause ...)
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(cons #`[(core:absence-event (core:role #,orientation-stx
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#,conversation-stx
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#,interest-type-stx)
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#,reason-stx)
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#,(stateful-lift 'on-absence (syntax (expr ...)))]
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(do-tail (syntax (outer-clause ...))))]
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[((on-message [message-pat expr ...] ...) outer-clause ...)
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(cons #`[(core:message-event (core:role #,orientation-stx
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#,conversation-stx
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#,interest-type-stx)
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message)
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(match message
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#,@(map (lambda (message-clause)
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(syntax-case message-clause ()
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([message-pat expr ...]
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#`[message-pat #,(stateful-lift 'on-message
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(syntax (expr ...)))])))
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(syntax->list (syntax ([message-pat expr ...] ...))))
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[_ (lambda: ([state : #,State]) (core:transition state '()))])]
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(do-tail (syntax (outer-clause ...))))]
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[(unknown-clause outer-clause ...)
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(raise-syntax-error #f
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"Illegal clause in endpoint definition"
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stx
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#'unknown-clause)]))
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(syntax-case stx ()
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[(dummy State pre-eid-exp role-exp handler-clause ...)
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#`(core:add-endpoint (cast pre-eid-exp core:PreEID)
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role-exp
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(match-lambda
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#,@(reverse
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(combine-handler-clauses
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#'State
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(syntax (handler-clause ...))
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#f
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(syntax old-state)
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(syntax _)
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(syntax _)
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(syntax _)
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(syntax _)))
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[_ (lambda: ([state : State]) (core:transition state '()))]))])))
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;;; Local Variables:
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;;; eval: (put 'name-endpoint 'scheme-indent-function 1)
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;;; eval: (put 'let-fresh 'scheme-indent-function 1)
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;;; eval: (put 'observe-subscribers: 'scheme-indent-function 2)
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;;; eval: (put 'observe-subscribers/everything: 'scheme-indent-function 2)
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;;; eval: (put 'observe-publishers: 'scheme-indent-function 2)
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;;; eval: (put 'observe-publishers/everything: 'scheme-indent-function 2)
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;;; eval: (put 'publisher: 'scheme-indent-function 2)
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;;; eval: (put 'subscriber: 'scheme-indent-function 2)
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;;; eval: (put 'match-state 'scheme-indent-function 1)
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;;; eval: (put 'match-orientation 'scheme-indent-function 1)
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;;; eval: (put 'match-conversation 'scheme-indent-function 1)
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;;; eval: (put 'match-interest-type 'scheme-indent-function 1)
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;;; eval: (put 'match-reason 'scheme-indent-function 1)
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;;; End:
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