Do not create intermediate collection when parsing sequence if not necesary.
The collection is not needed when the result of a choice is being used in mapped parser.
In that case, store parsed objects in variables and inline action code to use these variables
to access parsed objects.
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
PPCRewritingVisitor subclass:#PPCTokenizingVisitor
instanceVariableNames:'tokens'
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Visitors'
!
!PPCTokenizingVisitor methodsFor:'hooks'!
afterAccept: node retval: parserNode
self isRoot ifTrue: [
| tokenizerNode whitespaceNode |
self change.
tokens addLast: self eofToken.
tokens do: [ :token | token unmarkForInline ].
whitespaceNode := tokens detect: [ :e | e isTrimmingTokenNode ] ifNone:[nil].
whitespaceNode notNil ifTrue:[
whitespaceNode := whitespaceNode whitespace copy
unmarkForInline;
name: 'consumeWhitespace';
yourself
] ifFalse:[
whitespaceNode := (PPCNilNode new)
name: 'consumeWhitespace';
yourself
].
tokenizerNode := PPCTokenChoiceNode new
children: tokens asArray;
name: 'nextToken';
yourself.
^ PPCTokenizingParserNode new
parser: parserNode;
tokenizer: tokenizerNode;
whitespace: whitespaceNode;
name: #'mainParser';
yourself
].
^ parserNode
"Modified: / 12-05-2015 / 01:37:57 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!
eofToken
| ws |
ws := PPCStarNode new
child: (PPCMessagePredicateNode new
message: #isSeparator;
yourself);
yourself.
^ PPCTrimmingTokenNode new
child: PPCEndOfFileNode new;
whitespace: ws;
tokenClass: PPToken;
yourself.
! !
!PPCTokenizingVisitor methodsFor:'initialization'!
initialize
super initialize.
tokens := OrderedCollection new.
! !
!PPCTokenizingVisitor methodsFor:'testing'!
isRoot
^ openSet size = 1
! !
!PPCTokenizingVisitor methodsFor:'tokens'!
addToken: token
(tokens contains: [:e | e == token] ) ifFalse: [
tokens addLast: token
]
! !
!PPCTokenizingVisitor methodsFor:'visiting'!
visitActionNode: node
(node hasProperty: #trimmingToken) ifTrue: [
self change.
self addToken: node.
^ PPCTokenConsumeNode new
child: node;
yourself
].
^ super visitActionNode: node
!
visitTokenNode: node
self change.
self addToken: node.
^ PPCTokenConsumeNode new
child: node;
yourself.
!
visitTrimmingTokenNode: node
self change.
self addToken: node.
^ PPCTokenConsumeNode new
child: node;
yourself.
! !
!PPCTokenizingVisitor class methodsFor:'documentation'!
version_HG
^ '$Changeset: <not expanded> $'
! !