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ast
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This is a stripped down version of Armin Ronacher's ast module.
:copyright: Copyright 2008 by Armin Ronacher.
:license: Python License.
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rH Y q X q W dS )zAIterate over all fields of a node, only yielding existing fields.�_fieldsN)�hasattrr; �getattr�AttributeError)�node�fieldr8 r8 r9 � iter_fields_ s rA c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) � NodeVisitora�
Walks the abstract syntax tree and call visitor functions for every node
found. The visitor functions may return values which will be forwarded
by the `visit` method.
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class name of the node. So a `TryFinally` node visit function would
be `visit_TryFinally`. This behavior can be changed by overriding
the `get_visitor` function. If no visitor function exists for a node
(return value `None`) the `generic_visit` visitor is used instead.
Don't use the `NodeVisitor` if you want to apply changes to nodes during
traversing. For this a special visitor exists (`NodeTransformer`) that
allows modifications.
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Return the visitor function for this node or `None` if no visitor
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Walks the abstract syntax tree and allows modifications of nodes.
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from the previous location otherwise it's replaced with the return
value. The return value may be the original node in which case no
replacement takes place.
Here an example transformer that rewrites all `foo` to `data['foo']`::
class RewriteName(NodeTransformer):
def visit_Name(self, node):
return copy_location(Subscript(
value=Name(id='data', ctx=Load()),
slice=Index(value=Str(s=node.id)),
ctx=node.ctx
), node)
Keep in mind that if the node you're operating on has child nodes
you must either transform the child nodes yourself or call the generic
visit function for the node first.
Nodes that were part of a collection of statements (that applies to
all statement nodes) may also return a list of nodes rather than just
a single node.
Usually you use the transformer like this::
node = YourTransformer().visit(node)
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This visitor is able to transform a well formed syntax tree into python
sourcecode. For more details have a look at the docstring of the
`node_to_source` function.
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