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Python parse tree definitions.
This is a very concrete parse tree; we need to keep every token and
even the comments and whitespace between tokens.
There's also a pattern matching implementation here.
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Abstract base class for Node and Leaf.
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Compare two nodes for equality.
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Convert raw node information to a Node or Leaf instance.
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A pattern is a tree matching pattern.
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Nc O s | t k std��t�| �S )z>Constructor that prevents BasePattern from being instantiated.z Cannot instantiate BasePattern)rt r r r r r
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Does this pattern exactly match a node?
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Initializer. Takes optional type, content, and name.
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Match the pattern's content to the node's children.
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Initializer. Takes optional type, content, and name.
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type is None this matches *any* single node (leaf or not),
except if content is not None, in which it only matches
non-leaf nodes that also match the content pattern.
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must match the node's children exactly. If the content is
given, the type must not be None.
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A wildcard pattern can match zero or more nodes.
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except it always uses non-greedy matching.
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Initializer.
Args:
content: optional sequence of subsequences of patterns;
if absent, matches one node;
if present, each subsequence is an alternative [*]
min: optional minimum number of times to match, default 0
max: optional maximum number of times to match, default HUGE
name: optional name assigned to this match
[*] Thus, if content is [[a, b, c], [d, e], [f, g, h]] this is
equivalent to (a b c | d e | f g h); if content is None,
this is equivalent to '.' in regular expression terms.
The min and max parameters work as follows:
min=0, max=maxint: .*
min=1, max=maxint: .+
min=0, max=1: .?
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Generator yielding matches for a sequence of patterns and nodes.
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