Ë ?d°ãór—dZddlZddlmZddlmZGd„de«Zejfd„Z Gd„d e«Z y) aÓGeneric visitor pattern for pytrees. The lib2to3 parser produces a "pytree" - syntax tree consisting of Node and Leaf types. This module implements a visitor pattern for such trees. It also exports a basic "dumping" visitor that dumps a textual representation of a pytree into a stream. PyTreeVisitor: a generic visitor pattern for pytrees. PyTreeDumper: a configurable "dumper" for displaying pytrees. DumpPyTree(): a convenience function to dump a pytree. éN)Úpytree)Ú pytree_utilscó"—eZdZdZd„Zd„Zd„Zy)Ú PyTreeVisitoraðVisitor pattern for pytree trees. Methods named Visit_XXX will be invoked when a node with type XXX is encountered in the tree. The type is either a token type (for Leaf nodes) or grammar symbols (for Node nodes). The return value of Visit_XXX methods is ignored by the visitor. Visitors can modify node contents but must not change the tree structure (e.g. add/remove children and move nodes around). This is a very common visitor pattern in Python code; it's also used in the Python standard library ast module for providing AST visitors. Note: this makes names that aren't style conformant, so such visitor methods need to be marked with # pylint: disable=invalid-name We don't have a choice here, because lib2to3 nodes have under_separated names. For more complex behavior, the visit, DefaultNodeVisit and DefaultLeafVisit methods can be overridden. Don't forget to invoke DefaultNodeVisit for nodes that may have children - otherwise the children will not be visited. có—djtj|««}t||«rt ||«|«yt |t j«r|j|«y|j|«y)z Visit a node.z Visit_{0}N) ÚformatrÚNodeNameÚhasattrÚgetattrÚ isinstancerÚLeafÚDefaultLeafVisitÚDefaultNodeVisit)ÚselfÚnodeÚmethods úr=s<ðñ ó åå$ô6 Fô6 ðr$'§:¡:ó ô :=õ:r