compiler/PPCTrimNode.st
author Jan Vrany <jan.vrany@fit.cvut.cz>
Mon, 17 Aug 2015 12:13:16 +0100
changeset 515 b5316ef15274
parent 452 9f4558b3be66
permissions -rw-r--r--
Updated to PetitCompiler-JanKurs.160, PetitCompiler-Tests-JanKurs.112, PetitCompiler-Extras-Tests-JanKurs.25, PetitCompiler-Benchmarks-JanKurs.17 Name: PetitCompiler-JanKurs.160 Author: JanKurs Time: 17-08-2015, 09:52:26.291 AM UUID: 3b4bfc98-8098-4951-af83-a59e2585b121 Name: PetitCompiler-Tests-JanKurs.112 Author: JanKurs Time: 16-08-2015, 05:00:32.936 PM UUID: 85613d47-08f3-406f-9823-9cdab451e805 Name: PetitCompiler-Extras-Tests-JanKurs.25 Author: JanKurs Time: 16-08-2015, 05:00:10.328 PM UUID: 09731810-51a1-4151-8d3a-56b636fbd1f7 Name: PetitCompiler-Benchmarks-JanKurs.17 Author: JanKurs Time: 05-08-2015, 05:29:32.407 PM UUID: e544b5f1-bcf8-470b-93a6-d2363e4dfc8a

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

"{ NameSpace: Smalltalk }"

PPCSequenceNode subclass:#PPCTrimNode
	instanceVariableNames:''
	classVariableNames:''
	poolDictionaries:''
	category:'PetitCompiler-Nodes'
!

!PPCTrimNode methodsFor:'accessing'!

child
    
    ^ children at: 2
!

child: anObject
    
    children at: 2 put: anObject
!

defaultName
    ^ #trim
!

trimmer
    ^ children at: 1
!

trimmer: anObject
    children at: 1 put: anObject
! !

!PPCTrimNode methodsFor:'analysis'!

acceptsEpsilon
    ^ self child acceptsEpsilonOpenSet: (IdentitySet with: self).
!

acceptsEpsilonOpenSet: set
    (set includes: self child) ifFalse: [ 
        set add: self child.
        ^ self child acceptsEpsilonOpenSet: set 
    ].
    ^ false
! !

!PPCTrimNode methodsFor:'initialization'!

defaultTrimmer
    | message |
    message := PPCMessagePredicateNode new 
            message: #isSeparator;
            predicate: [ :char | char isSeparator ]
            yourself.
    ^ PPCStarNode new
        child: message;
        yourself.
!

initialize
    super initialize.
    children := Array new: 2.
    children at: 1 put: self defaultTrimmer.
! !

!PPCTrimNode methodsFor:'visiting'!

accept: visitor
    ^ visitor visitTrimNode: self
! !