Added dependencies on petitparser/analyzer and petitparser/islands
...as compiler makes use of some of their extension methods.
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
PPCListNode subclass:#PPCSequenceNode
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Nodes'
!
!PPCSequenceNode methodsFor:'accessing'!
prefix
^ #seq
! !
!PPCSequenceNode methodsFor:'analysis'!
acceptsEpsilon
^ self acceptsEpsilonOpenSet: IdentitySet new.
!
acceptsEpsilonOpenSet: set
set add: self.
^ self children allSatisfy: [:e | e acceptsEpsilonOpenSet: set ]
!
firstSetSuchThat: block into: aCollection openSet: aSet
(aSet includes: self) ifTrue: [ ^ aCollection ].
aSet add: self.
(block value: self) ifTrue: [ aCollection add: self. ^ aCollection ].
self children do: [ :child |
child firstSetSuchThat: block into: aCollection openSet: aSet.
child acceptsEpsilon ifFalse: [ ^ aCollection ]
].
^ aCollection
!
firstSets: aFirstDictionary into: aSet suchThat: aBlock
| nullable |
"TODO JK: aBlock is ignored by now"
children do: [ :node |
nullable := false.
(aFirstDictionary at: node) do: [ :each |
each isNullable
ifTrue: [ nullable := true ]
ifFalse: [ aSet add: each ] ].
nullable
ifFalse: [ ^ self ] ].
aSet add: PPCSentinelNode instance
! !
!PPCSequenceNode methodsFor:'compiling'!
addGuard: compiler id: id
| guard firsts |
(compiler guards not or: [(guard := PPCGuard on: self) makesSense not]) ifTrue: [ ^ self].
firsts := (self firstSetSuchThat: [ :e | (e isKindOf: PPCTrimmingTokenNode) or: [ e isTerminal ] ]).
(firsts allSatisfy: [ :e | e isKindOf: PPCTrimmingTokenNode ]) ifTrue: [
"If we start with trimming, we should invoke the whitespace parser"
firsts anyOne compileWhitespace: compiler.
compiler add: 'context atEnd ifTrue: [ ^ self error ].'.
guard id: id, '_guard'.
guard compileGuard: compiler.
compiler addOnLine: 'ifFalse: [ ^ self error ].'
].
(firsts allSatisfy: [ :e | e isTerminal ]) ifTrue: [
compiler add: 'context atEnd ifTrue: [ ^ self error ].'.
guard id: id, '_guard'.
guard compileGuard: compiler.
compiler addOnLine: 'ifFalse: [ ^ self error ].'
].
!
compileWith: compiler effect: effect id: id
compiler startMethod: id.
compiler addVariable: 'retval'.
compiler addVariable: 'element'.
compiler addVariable: 'memento'.
compiler add: (compiler smartRemember: self).
compiler add: 'retval := Array new: ', children size asString, '.'.
self addGuard: compiler id: id.
" Halt if: [ self name = #qualifiedName ]."
(1 to: children size) do: [ :idx | |child|
child := children at: idx.
compiler add: 'element := '.
compiler callOnLine: (child compileWith: compiler).
compiler add: 'error ifTrue: [ ', (compiler smartRestore: self) ,' ^ failure ].'.
compiler add: 'retval at: ', idx asString, ' put: element.'.
].
compiler add: '^ retval'.
^ compiler stopMethod.
! !
!PPCSequenceNode methodsFor:'first follow next'!
followSets: aFollowDictionary firstSets: aFirstDictionary into: aSet suchThat: aBlock
children keysAndValuesDo: [ :index :node |
| follow first |
follow := aFollowDictionary at: node.
index = children size
ifTrue: [ follow addAll: aSet ]
ifFalse: [
(self class withAll: (children
copyFrom: index + 1 to: children size))
firstSets: aFirstDictionary
into: (first := IdentitySet new)
suchThat: aBlock.
(first anySatisfy: [ :each | each isNullable ])
ifTrue: [ follow addAll: aSet ].
follow addAll: (first
reject: [ :each | each isNullable ]) ] ]
! !
!PPCSequenceNode methodsFor:'optimizing'!
asFast
^ PPCTokenSequenceNode new
children: children;
name: self name;
properties: properties;
yourself
! !