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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.
z#Guido van Rossum N)StringIOic C sD t s8ddlm} |j D ] \}}t|tkr|t |< qt | | S )N )python_symbols) _type_reprsZpygramr __dict__itemstypeint
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Abstract base class for Node and Leaf.
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Compare two nodes for equality.
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Compare two nodes for equality.
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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
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The node immediately preceding the invocant in their parent's children
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The whitespace and comments preceding this node in the input.
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optional context keyword argument.
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A subclass can define this as a hook for optimizations.
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Does this pattern exactly match a node?
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Generator yielding all matches for this pattern.
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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.
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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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dict under that key.
NT)r& r7 r% WildcardPattern wildcardsr rt r )r r rt r r8 itemr
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zNodePattern.__init__c C s | j rHt| j|jD ].\}}|t|jkr|dk r<|| dS qdS t| jt|jkr`dS t| j|jD ]\}}|||sn dS qndS )r NTF)r r~ rt r( rp rx zipr{ )r r4 ry crz
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A wildcard pattern can match zero or more nodes.
This has all the flexibility needed to implement patterns like:
.* .+ .? .{m,n}
(a b c | d e | f)
(...)* (...)+ (...)? (...){m,n}
except it always uses non-greedy matching.
Nr c C s< |dk r t tt |}|D ]}q|| _|| _|| _|| _dS )a
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: .?
min=1, max=1: .
If content is not None, replace the dot with the parenthesized
list of alternatives, e.g. (a b c | d e | f g h)*
N)tupler\ rt minmaxr )r rt r r r altr
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