"{ Package: 'stx:libcomp' }"

"{ NameSpace: Smalltalk }"

Object subclass:#ParseNodeVisitor

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'System-Compiler-Support'

!

!ParseNodeVisitor class methodsFor:'documentation'!

documentation

"

    a whitebox expandable abstract parsenode visitor.

    Subclasses should redefine those acceptXXX methods, in which they are interested.

"    

! !

!ParseNodeVisitor methodsFor:'visiting'!

visit:anObject 

    | stmt |

    ^anObject isStatementNode 

        ifTrue:[

            stmt := anObject.

            [ stmt isNil ] whileFalse:[

                stmt acceptVisitor:self.

                stmt := stmt nextStatement.

            ]

        ] 

        ifFalse:[

            anObject acceptVisitor: self.

        ]

    "Modified: / 25-07-2011 / 22:33:50 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitAssignmentNode:anObject 

    self visit: anObject variable.

    self visit: anObject expression.

    "Modified: / 25-07-2011 / 22:30:54 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitBinaryNode:anObject 

    ^self visitMessageNode: anObject

    "Modified: / 25-07-2011 / 22:30:04 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitBlockNode:anObject 

    anObject statements ifNotNil:[

        self visit: anObject statements

    ].

    "Modified: / 25-07-2011 / 22:45:02 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitCascadeNode:anObject 

    self visitMessageNode: anObject.

    "Modified: / 25-07-2011 / 22:37:00 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitConstantNode:anObject

    "Modified: / 25-07-2011 / 22:41:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitECompletionConstantNode:anObject 

    "dispatched back from the visited eCompletionConstantNode-object (visitor pattern)"

    "fall back to general object-case - please change as required"

    ^ self visitObject:anObject

!

visitMessageNode:anObject 

    self visit: anObject receiver.

    anObject arguments do:[:arg|

        self visit: arg.

    ]

    "Modified: / 25-07-2011 / 22:37:56 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitObject:anObject 

    "dispatched back from the visited objects (visitor pattern)"

    "general fallBack - please change as required"

    self halt:'not yet implemented'

!

visitParseErrorNode:anObject

    "Modified: / 25-07-2011 / 22:38:08 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitPrimitiveNode:anObject

    "Modified: / 25-07-2011 / 22:38:14 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitReturnNode:anObject 

    self visit: anObject expression.

!

visitSelfNode:anObject 

    "/ to be redefined in subclasses

!

visitStatementNode:anObject 

    |expr|

    (expr := anObject expression) notNil ifTrue:[

        self visit: expr.

    ]

!

visitSuperNode:anObject 

    "/ to be redefined in subclasses

!

visitUnaryNode:anObject 

    ^self visitMessageNode: anObject

!

visitVariableNode:anObject 

    "/ to be redefined in subclasses

! !

!ParseNodeVisitor class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !