ó
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V\¬Qc @ s[ d d l m Z d d d YZ d e f d YZ e Z d d d Z d Z d S(
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iÿÿÿÿ( t astt
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ASTVisitorc B s8 e Z d Z d Z d Z d Z d Z d Z RS( s Performs a depth-first walk of the AST
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The ASTVisitor will walk the AST, performing either a preorder or
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postorder traversal depending on which method is called.
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methods:
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preorder(tree, visitor)
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postorder(tree, visitor)
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tree: an instance of ast.Node
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visitor: an instance with visitXXX methods
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The ASTVisitor is responsible for walking over the tree in the
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correct order. For each node, it checks the visitor argument for
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a method named 'visitNodeType' where NodeType is the name of the
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node's class, e.g. Class. If the method exists, it is called
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with the node as its sole argument.
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The visitor method for a particular node type can control how
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child nodes are visited during a preorder walk. (It can't control
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the order during a postorder walk, because it is called _after_
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the walk has occurred.) The ASTVisitor modifies the visitor
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argument by adding a visit method to the visitor; this method can
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be used to visit a child node of arbitrary type.
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i c C s d | _ i | _ d S( N( t Nonet nodet _cache( t self( ( sX /tmp/ndk-User/buildhost/install/prebuilt/darwin-x86_64/lib/python2.7/compiler/visitor.pyt __init__" s c G s+ x$ | j D] } | j | | q Wd S( N( t getChildNodest dispatch( R R t argst child( ( sX /tmp/ndk-User/buildhost/install/prebuilt/darwin-x86_64/lib/python2.7/compiler/visitor.pyt default& s c G su | | _ | j } | j j | d } | d k rh | j } t | j d | | j } | | j | <n | | | S( Nt visit( R t __class__R t getR t __name__t getattrt visitorR ( R R R t klasst metht className( ( sX /tmp/ndk-User/buildhost/install/prebuilt/darwin-x86_64/lib/python2.7/compiler/visitor.pyR * s c G s) | | _ | j | _ | j | | d S( s& Do preorder walk of tree using visitorN( R R R ( R t treeR R ( ( sX /tmp/ndk-User/buildhost/install/prebuilt/darwin-x86_64/lib/python2.7/compiler/visitor.pyt preorder; s ( R t
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__module__t __doc__t VERBOSER R R R ( ( ( sX /tmp/ndk-User/buildhost/install/prebuilt/darwin-x86_64/lib/python2.7/compiler/visitor.pyR s t ExampleASTVisitorc B s e Z d Z i Z d Z RS( sÛ Prints examples of the nodes that aren't visited
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This visitor-driver is only useful for development, when it's
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helpful to develop a visitor incrementally, and get feedback on what
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you still have to do.
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