84 lines
2.7 KiB
JavaScript
84 lines
2.7 KiB
JavaScript
// -*- javascript -*-
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// Syntactic extensions to ES5 for Syndicate/js. See compiler.js for
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// the rest of the translator.
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Syndicate <: ES5 {
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//---------------------------------------------------------------------------
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// Extensions to expressions.
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Statement
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+= ActorStatement
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| NetworkStatement
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| ActorFacetStatement
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| AssertionTypeDeclarationStatement
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| SendMessageStatement
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ActorStatement
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= actor CallExpression Block -- withConstructor
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| actor Block -- noConstructor
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NetworkStatement
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= ground network Block -- ground
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| network Block -- normal
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ActorFacetStatement
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= state FacetBlock until FacetStateTransitionBlock -- state
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| until FacetStateTransitionBlock -- until
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| forever FacetBlock -- forever
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AssertionTypeDeclarationStatement
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= assertion type identifier "(" FormalParameterList ")" ("=" stringLiteral)? #(sc)
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SendMessageStatement = "::" Expression<withIn> #(sc)
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//---------------------------------------------------------------------------
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// Ongoing event handlers.
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FacetBlock = "{" FacetInitBlock? FacetSituation* FacetDoneBlock? "}"
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FacetStateTransitionBlock = "{" FacetStateTransition* "}"
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FacetInitBlock = init Block
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FacetDoneBlock = done Block
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FacetSituation
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= assert FacetPattern #(sc) -- assert
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| on FacetEventPattern Block -- event
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| during FacetPattern FacetBlock -- during
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FacetEventPattern
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= message FacetPattern -- messageEvent
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| asserted FacetPattern -- assertedEvent
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| retracted FacetPattern -- retractedEvent
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FacetStateTransition
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= case FacetEventPattern Block -- withContinuation
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| case FacetEventPattern #(sc) -- noContinuation
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FacetPattern
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= LeftHandSideExpression metalevel decimalIntegerLiteral -- withMetalevel
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| LeftHandSideExpression -- noMetalevel
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//---------------------------------------------------------------------------
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// Keywords. We don't add them to the "keyword" production because
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// we don't want to make them unavailable to programs as
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// identifiers.
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actor = "actor" ~identifierPart
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assert = "assert" ~identifierPart
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asserted = "asserted" ~identifierPart
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assertion = "assertion" ~identifierPart
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done = "done" ~identifierPart
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during = "during" ~identifierPart
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forever = "forever" ~identifierPart
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ground = "ground" ~identifierPart
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init = "init" ~identifierPart
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message = "message" ~identifierPart
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metalevel = "metalevel" ~identifierPart
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network = "network" ~identifierPart
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on = "on" ~identifierPart
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retracted = "retracted" ~identifierPart
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state = "state" ~identifierPart
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type = "type" ~identifierPart
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until = "until" ~identifierPart
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}
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