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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.
This provides some default functionality and boilerplate using the
template pattern.
A node may be a subnode of at most one parent.
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Compare two nodes for equality.
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Compare two nodes for equality.
This is called by __eq__ and __ne__. It is only called if the two nodes
have the same type. This must be implemented by the concrete subclass.
Nodes should be considered equal if they have the same structure,
ignoring the prefix string and other context information.
N��NotImplementedErrorr r
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Return a cloned (deep) copy of self.
This must be implemented by the concrete subclass.
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Return a post-order iterator for the tree.
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Return a pre-order iterator for the tree.
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Remove the node from the tree. Returns the position of the node in its
parent's children before it was removed.
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The node immediately following the invocant in their parent's children
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Return the string immediately following the invocant node. This is
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The whitespace and comments preceding this node in the input.
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Equivalent to 'node.children[i] = child'. This method also sets the
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optional context keyword argument.
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)rn r! r
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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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- NodePattern matches a single node (usually non-leaf);
- WildcardPattern matches a sequence of nodes of variable length.
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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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this matches any *leaf* node; the content may still be required.
The content, if given, must be a string.
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dict under that key.
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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.
The type, if given, must be a symbol type (>= 256). If the
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.
The content, if not None, must be a sequence of Patterns that
must match the node's children exactly. If the content is
given, the type must not be None.
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dict under that key.
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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;
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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: .?
min=1, max=1: .
If content is not None, replace the dot with the parenthesized
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results: dict containing named submatches.
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lingo). If it is not None, this matches whenever the argument
pattern doesn't have any matches.
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Generator yielding matches for a sequence of patterns and nodes.
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nodes: a sequence of nodes
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results: dict containing named submatches.
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