PPLimitedChoiceParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Mon, 23 Nov 2015 11:14:30 +0100
changeset 551 00ebb1b85f53
parent 421 7e08b31e0dae
permissions -rw-r--r--
Fixed CI scripts on Windows For an unknown reason, unzip on Windows reports status code 50 (presumably "the disk is (or was) full during extraction.") even if there's plenty of space. To workaround this, simply ignore status code 50 on Windows. Sigh.

"{ 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
! !