PPStartOfWordParser.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Thu, 21 May 2015 14:12:22 +0100
changeset 464 f6d77fee9811
parent 427 a7f5e6de19d2
permissions -rw-r--r--
Updated to PetitCompiler-JanKurs.118, PetitCompiler-Tests-JanKurs.46, PetitCompiler-Extras-Tests-JanKurs.11, and PetitCompiler-Benchmarks-JanKurs.11 Name: PetitCompiler-JanKurs.118 Author: JanKurs Time: 13-05-2015, 03:59:01.292 PM UUID: 4a8ccd94-3131-4cc7-9098-528f8e5ea0b5 Name: PetitCompiler-Tests-JanKurs.46 Author: JanKurs Time: 04-05-2015, 04:25:06.162 PM UUID: 9f4cf8b7-876e-4a13-9579-b833f016db66 Name: PetitCompiler-Extras-Tests-JanKurs.11 Author: JanKurs Time: 13-05-2015, 04:27:27.940 PM UUID: e9f30c31-fbd0-4e96-ad2a-868f88d20ea8 Name: PetitCompiler-Benchmarks-JanKurs.11 Author: JanKurs Time: 13-05-2015, 02:21:49.932 PM UUID: 6a23fd1e-a86f-46db-8221-cc41b778d32c

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

"{ NameSpace: Smalltalk }"

PPParser subclass:#PPStartOfWordParser
	instanceVariableNames:''
	classVariableNames:''
	poolDictionaries:''
	category:'PetitParser-Parsers'
!

!PPStartOfWordParser methodsFor:'as yet unclassified'!

acceptsEpsilon
	^ true
!

parseOn: aPPContext
	aPPContext atEnd ifTrue: [  
		^ PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
	].

	(aPPContext position == 0) ifTrue: [ 
		(aPPContext peek isAlphaNumeric) ifTrue: [ 
			^ #startOfWord
		] ifFalse: [ 
			^ PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
	 	]
	].

	aPPContext back.
	aPPContext peek isAlphaNumeric ifTrue: [
		^ PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
	].
	aPPContext next.
	
	^ aPPContext peek isAlphaNumeric ifTrue: [ #startOfWord ] ifFalse: [ 
		PPFailure message: 'Start of word expected' context: aPPContext at: aPPContext position 
	]
	
! !