# HG changeset patch
# User Claus Gittinger <cg@exept.de>
# Date 1393947718 -3600
# Node ID 8cc5a5a8f416540950c66c072219f223e65d6e68
# Parent  29f7cfdac4927355efae28d7e778c92fbdec51b2
initial checkin

diff -r 29f7cfdac492 -r 8cc5a5a8f416 analyzer/PPRewriter.st
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/analyzer/PPRewriter.st	Tue Mar 04 16:41:58 2014 +0100
@@ -0,0 +1,72 @@
+"{ Package: 'stx:goodies/petitparser/analyzer' }"
+
+PPProcessor subclass:#PPRewriter
+	instanceVariableNames:'changed'
+	classVariableNames:''
+	poolDictionaries:''
+	category:'PetitAnalyzer-Core'
+!
+
+
+!PPRewriter methodsFor:'accessing'!
+
+replace: aSearchParser with: aReplaceParser
+	self replace: aSearchParser with: aReplaceParser when: [ :node | true ]
+!
+
+replace: aSearchParser with: aReplaceParser when: aValidationBlock
+	self addRule: (PPParserReplaceRule searchFor: aSearchParser replaceWith: aReplaceParser when: aValidationBlock)
+!
+
+replace: aSearchParser withValueFrom: aReplaceBlock
+	self replace: aSearchParser withValueFrom: aReplaceBlock when: [ :node | true ]
+!
+
+replace: aSearchParser withValueFrom: aReplaceBlock when: aValidationBlock
+	self addRule: (PPBlockReplaceRule searchFor: aSearchParser replaceWith: aReplaceBlock when: aValidationBlock)
+! !
+
+!PPRewriter methodsFor:'initialization'!
+
+initialize
+	super initialize.
+	changed := false
+! !
+
+!PPRewriter methodsFor:'public'!
+
+execute: aParser
+	"Perform the replace rules of the receiver on aParser, answer the resulting parser."
+
+	| previous result |
+	previous := context.
+	changed := false.
+	context := Dictionary new.
+	result := aParser transform: [ :each |
+		| transformed |
+		transformed := self performRulesOn: each.
+		transformed isNil
+			ifTrue: [ each ]
+			ifFalse: [ changed := true. transformed ] ].
+	context := previous.
+	^ result
+! !
+
+!PPRewriter methodsFor:'testing'!
+
+hasChanged
+	"Answer if the last operation has changed anything."
+	
+	^ changed
+! !
+
+!PPRewriter class methodsFor:'documentation'!
+
+version
+    ^ '$Header: /cvs/stx/stx/goodies/petitparser/analyzer/PPRewriter.st,v 1.1 2014-03-04 15:41:58 cg Exp $'
+!
+
+version_CVS
+    ^ '$Header: /cvs/stx/stx/goodies/petitparser/analyzer/PPRewriter.st,v 1.1 2014-03-04 15:41:58 cg Exp $'
+! !
+