PPLimitedChoiceParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Tue, 16 Jun 2015 07:49:21 +0100
changeset 491 82b272c7dc37
parent 421 7e08b31e0dae
permissions -rw-r--r--
Codegen: added support for smart action node compiling. Avoid creation of intermediate result collection for action nodes if all references to action block's argument (i.e., the nodes collection) is in form of: * <nodes> at: <numeric constant> * <nodes> first (second, third...

"{ Package: 'stx:goodies/petitparser' }"

PPChoiceParser subclass:#PPLimitedChoiceParser
	instanceVariableNames:'limit'
	classVariableNames:''
	poolDictionaries:''
	category:'PetitParser-Parsers'
!

!PPLimitedChoiceParser methodsFor:'accessing'!

limit
	
	^ limit
!

limit: anObject
	
	limit := anObject
! !

!PPLimitedChoiceParser methodsFor:'as yet unclassified'!

// aRule 
	^ self copyWith: aRule
!

initialize
	limit := nil asParser
!

parseOn: aPPContext
	"This is optimized code that avoids unnecessary block activations, do not change. When all choices fail, the last failure is answered."

	| element limitResult memento |
	"self halt."
	1 to: parsers size do: [ :index |
		memento := aPPContext remember.
		
		element := (parsers at: index)
			parseOn: aPPContext.
		
		(element isPetitFailure not) ifTrue: [ 
			"check limit"
			limitResult := limit parseOn: aPPContext.
			limitResult isPetitFailure ifTrue: [ 
				element := PPFailure message: 'limit failed' at: aPPContext position .
				aPPContext restore: memento.
			] ifFalse: [ ^ element ].
		].
	].	
	^ element
! !