"

 COPYRIGHT (c) 2006 by eXept Software AG

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libcomp' }"

"{ NameSpace: Smalltalk }"

ParseNodeVisitor subclass:#PluggableParseNodeVisitor

	instanceVariableNames:'actionsPerNodeType'

	classVariableNames:''

	poolDictionaries:''

	category:'System-Compiler-Support'

!

!PluggableParseNodeVisitor class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 2006 by eXept Software AG

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    a pluggable node visitor.

    setup with:

        actionForNodeClass:aClass put:aBlock

    for example, if you are only interested in assignments,

    use the following code:

        |v|

        v := PluggableParseNodeVisitor new.

        v actionForNodeClass:AssignmentNode put:[:node | Transcript showCR:node. true].

        v visit:(Parser parse:code in:someClass.

"

! !

!PluggableParseNodeVisitor methodsFor:'setup'!

actionForNodeClass:aNodeClass put:aBlock

    "setup so that for nodes of type aNodeClass, aBlock is invoked.

     If the block returns true, subnodes (eg. right side of assignments, etc.)

     will be enumerated as well.

     Otherwise, no subnodes are visited."

    actionsPerNodeType isNil ifTrue:[

         actionsPerNodeType := Dictionary new.

    ].

    actionsPerNodeType at:aNodeClass put:aBlock

! !

!PluggableParseNodeVisitor methodsFor:'visiting'!

visit:aNodeObject

    "redefined to look for an action for this node's class.

     If there is one, it can specify if subnodes are to be visited too"

    |action|

    action := actionsPerNodeType at:aNodeObject class ifAbsent:[nil].

    action notNil ifTrue:[ 

        (action value:aNodeObject) ifFalse:[^ self].

    ].

    super visit:aNodeObject

! !

!PluggableParseNodeVisitor class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !