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Python parse tree definitions.
This is a very concrete parse tree; we need to keep every token and
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There's also a pattern matching implementation here.
z#Guido van Rossum N)StringIOic C sH t st| j jD ].\}}|| kr| j j | j j|= d| _ |S qW dS )z
Remove the node from the tree. Returns the position of the node in its
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The node immediately following the invocant in their parent's children
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Return a pretty string representation.
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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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Equivalent to 'node.children.insert(i, child)'. This method also sets
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Equivalent to 'node.children.append(child)'. This method also sets the
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N)r" r# r% r& )r r5 r
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dd Zdd Zdd Zdd Zdd Zdd ZeeeZdS )r, z'Concrete implementation for leaf nodes.r: r Nc C sF |dk r|\| _ \| _| _|| _|| _|dk r4|| _ |dd | _dS )z
Initializer.
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Return a pretty string representation.
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The whitespace and comments preceding this token in the input.
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r, c C sN |\}}}}|s|| j krConstructor that prevents BasePattern from being instantiated.)r r )r r r r
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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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Does this pattern exactly match a sequence of nodes?
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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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rl c @ s$ e Zd ZdZdddZdddZdS ) NodePatternFNc C sT |dk r|dk r>t |}x$t|D ]\}}t|tr"d| _q"W || _|| _|| _dS )ad
Initializer. Takes optional type, content, and name.
The type, if given, must be a symbol type (>= 256). If the
type is None this matches *any* single node (leaf or not),
except if content is not None, in which it only matches
non-leaf nodes that also match the content pattern.
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given, the type must not be None.
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NT)r! r1 r WildcardPattern wildcardsr ra r )r r ra r r2 itemr
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zNodePattern.__init__c C s | j rJx>t| j|jD ],\}}|t|jkr|dk r>|j| dS qW dS t| jt|jkrbdS x*t| j|jD ]\}}|j||srdS qrW dS )a
Match the pattern's content to the node's children.
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updated with the nodes matching named subpatterns.
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NTF)ro rk ra r# r] re ziprh )r r. rf crg
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A wildcard pattern can match zero or more nodes.
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.* .+ .? .{m,n}
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except it always uses non-greedy matching.
Nr c C s@ |dk r$t tt |}x |D ]}q W || _|| _|| _|| _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: .?
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If content is not None, replace the dot with the parenthesized
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zWildcardPattern.__init__c C s d}| j dk r\}}|t|kr |dk rF|j| | jrFt||| j< dS q W dS )z4Does this pattern exactly match a sequence of nodes?NTF)rk r] re r r! )r ri rf rr rg r
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zWildcardPattern.match_seqc c s: | j dkrXxJt| jdtt|| j D ]*}i }| jrH|d| || j< ||fV q(W n| jdkrp| j|V nttdrtj }t
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Generator yielding matches for a sequence of nodes.
Args:
nodes: sequence of nodes
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count: the match comprises nodes[:count];
results: dict containing named submatches.
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z WildcardPattern.generate_matchesc c s t |}d| jkr di fV g }x>| jD ]4}x.t||D ] \}}||fV |j||f q8W q(W x|rg }x|D ]\}} ||k rr|| jkrrxn| jD ]d}x^t|||d D ]H\}
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z"WildcardPattern._iterative_matchesc C sx d}i }d}t |}xH| r\||k r\d}x0| jD ]&}|d j|| |r0|d7 }d}P q0W qW |d| || j< ||fS )z(Special optimized matcher for bare_name.r FTr N)r] ra rh r )r ri r rg donerv Zleafr
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z"WildcardPattern._bare_name_matchesc c s || j krdi fV || jk rxr| jD ]h}xbt||D ]T\}}xJ| j||d |d D ].\}}i }|j| |j| || |fV qXW q6W q&W dS )z(Helper to recursively yield the matches.r Nr )ru rv ra rk r} re ) r ri r rw r r r r rg r
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Initializer.
The argument is either a pattern or None. If it is None, this
only matches an empty sequence (effectively '$' in regex
lingo). If it is not None, this matches whenever the argument
pattern doesn't have any matches.
N)ra )r ra r
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r c c s | sdi fV n| d | dd }}xl|j |D ]^\}}|sJ||fV q2xDt |||d D ].\}}i }|j| |j| || |fV q^W q2W dS )aR
Generator yielding matches for a sequence of patterns and nodes.
Args:
patterns: a sequence of patterns
nodes: a sequence of nodes
Yields:
(count, results) tuples where:
count: the entire sequence of patterns matches nodes[:count];
results: dict containing named submatches.
r r N)rk re ) Zpatternsri prestr r r r rg r
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