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The grammer is taken from PatternGrammar.txt.
The compiler compiles a pattern to a pytree.*Pattern instance.
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| j d t �| _ d S( s^ Initializer.
Takes an optional alternative filename for the pattern grammar.
t convertN( R t load_grammarR R t Symbolst symst python_grammart pygrammart python_symbolst pysymst Drivert pattern_convert( t selft grammar_file( ( s' /usr/lib64/python2.7/lib2to3/patcomp.pyt __init__- s
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rR } t t | � � � n X| rl | j | � | f S| j | � Sd S( s= Compiles a pattern string to a nested pytree.*Pattern object.t debugN( R R t parse_tokensR t
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d | �} q�n | d k r�| | _ n | j � S( sX Compiles a node, recursively.
This is one big switch on the node type.
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