52 lines
1.3 KiB
Smalltalk
52 lines
1.3 KiB
Smalltalk
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Extension { #name : 'PPSequenceParser' }
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{ #category : '*petitislands' }
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PPSequenceParser >> acceptsEpsilonOpenSet: set [
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set add: self.
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^ self children allSatisfy: [:e | e acceptsEpsilonOpenSet: set ]
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]
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{ #category : '*petitislands' }
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PPSequenceParser >> isIslandBorderOpenSet: set [
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set add: self.
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^ self children anySatisfy: [:e | e isIslandBorderOpenSet: set ]
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]
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{ #category : '*petitislands' }
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PPSequenceParser >> nextSets: aNextDictionary into: aSet [
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| change tally tmp childSet |
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change := false.
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self children keysAndValuesDo: [ :index :child |
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childSet := (aNextDictionary at: child).
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tally := childSet size.
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index = parsers size ifTrue: [
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childSet addAll: aSet.
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] ifFalse: [
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tmp := self subsequenceFrom: index + 1 to: parsers size.
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childSet add: tmp.
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tmp isIslandBorder ifFalse: [
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childSet addAll: aSet.
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]
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].
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change := change or: [ (aNextDictionary at: child) size ~= tally ]
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].
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^ change
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]
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{ #category : '*petitislands' }
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PPSequenceParser >> subsequenceFrom: from to: to [
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| interval dict |
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interval := from to: to.
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dict := self propertyAt: #subsequenceCache ifAbsentPut: [ Dictionary new ].
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^ dict at: interval ifAbsentPut: [
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(from = to)
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ifTrue: [ parsers at: from ]
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ifFalse: [ self class withAll: (parsers copyFrom: from to: to) ]
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].
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]
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