<s> import re <EOL> from surlex . exceptions import MalformedSurlex <EOL> from surlex . macros import MacroRegistry , DefaultMacroRegistry <EOL> try : <EOL> if next : <EOL> pass <EOL> except NameError : <EOL> def next ( iterable ) : <EOL> return iterable . next ( ) <EOL> class Node ( object ) : <EOL> pass <EOL> class TextNode ( Node ) : <EOL> def __init__ ( self , token ) : <EOL> self . token = token <EOL> def __eq__ ( self , other ) : <EOL> return ( self . __class__ == other . __class__ and <EOL> self . token == other . token ) <EOL> def __repr__ ( self ) : <EOL> return '<STR_LIT>' % self . token <EOL> class WildcardNode ( Node ) : <EOL> def __init__ ( self ) : <EOL> pass <EOL> def __eq__ ( self , other ) : <EOL> return self . __class__ == other . __class__ <EOL> def __repr__ ( self ) : <EOL> return '<STR_LIT>' <EOL> class BlockNode ( Node ) : <EOL> def __init__ ( self , node_list ) : <EOL> self . node_list = node_list <EOL> def __eq__ ( self , other ) : <EOL> return ( self . __class__ == other . __class__ and <EOL> self . node_list == other . node_list ) <EOL> class OptionalNode ( BlockNode ) : <EOL> def __repr__ ( self ) : <EOL> return '<STR_LIT>' % self . node_list <EOL> class TagNode ( Node ) : <EOL> def __init__ ( self , name ) : <EOL> self . name = name <EOL> def __eq__ ( self , other ) : <EOL> return ( self . __class__ == other . __class__ and <EOL> self . name == other . name ) <EOL> def __repr__ ( self ) : <EOL> return '<STR_LIT>' % self . name <EOL> class RegexTagNode ( TagNode ) : <EOL> def __init__ ( self , name , regex ) : <EOL> self . name = name <EOL> self . regex = regex <EOL> def __eq__ ( self , other ) : <EOL> return ( self . __class__ == other . __class__ and <EOL> self . name == other . name and <EOL> self . regex == other . regex ) <EOL> def __repr__ ( self ) : <EOL> return '<STR_LIT>' % ( self . name , self . regex ) <EOL> class MacroTagNode ( TagNode ) : <EOL> def __init__ ( self , name , macro ) : <EOL> self . name = name <EOL> self . macro = macro <EOL> def __eq__ ( self , other ) : <EOL> return ( self . __class__ == other . __class__ and <EOL> self . name == other . name and <EOL> self . macro == other . macro ) <EOL> def __repr__ ( self ) : <EOL> return '<STR_LIT>' % ( self . name , self . macro ) <EOL> class Parser ( object ) : <EOL> def __init__ ( self , surlex ) : <EOL> self . surlex = surlex <EOL> self . chars = iter ( surlex ) <EOL> def get_node_list ( self ) : <EOL> return list ( self . parse ( self . chars ) ) <EOL> def read_until ( self , chars , char ) : <EOL> try : <EOL> next_char = next ( chars ) <EOL> except StopIteration : <EOL> raise MalformedSurlex ( '<STR_LIT>' % char ) <EOL> if next_char == char : <EOL> return '<STR_LIT>' <EOL> if next_char == '<STR_LIT:\\>' : <EOL> escaped_char = next ( chars ) <EOL> if escaped_char == char : <EOL> return escaped_char + self . read_until ( chars , char ) <EOL> else : <EOL> return '<STR_LIT:\\>' + escaped_char + self . read_until ( chars , char ) <EOL> else : <EOL> return next_char + self . read_until ( chars , char ) <EOL> def parse ( self , chars ) : <EOL> token = '<STR_LIT>' <EOL> for char in chars : <EOL> if char in '<STR_LIT>' : <EOL> if token : <EOL> yield TextNode ( token ) <EOL> token = '<STR_LIT>' <EOL> if char == '<STR_LIT:\\>' : <EOL> token += next ( chars ) <EOL> elif char == '<STR_LIT:<>' : <EOL> tag_content = self . read_until ( chars , '<STR_LIT:>>' ) <EOL> name = '<STR_LIT>' <EOL> regex = None <EOL> macro = None <EOL> for char in tag_content : <EOL> if char == '<STR_LIT:=>' : <EOL> name , regex = tag_content . split ( '<STR_LIT:=>' , <NUM_LIT:1> ) <EOL> break <EOL> if char == '<STR_LIT::>' : <EOL> name , macro = tag_content . split ( '<STR_LIT::>' , <NUM_LIT:1> ) <EOL> break <EOL> if regex : <EOL> yield RegexTagNode ( name , regex ) <EOL> elif macro : <EOL> yield MacroTagNode ( name , macro ) <EOL> else : <EOL> yield TagNode ( tag_content ) <EOL> elif char == '<STR_LIT:*>' : <EOL> yield WildcardNode ( ) <EOL> elif char == '<STR_LIT:(>' : <EOL> yield OptionalNode ( list ( self . parse ( chars ) ) ) <EOL> elif char == '<STR_LIT:)>' : <EOL> break <EOL> else : <EOL> token += char <EOL> if token : <EOL> yield TextNode ( token ) <EOL> class RegexScribe ( object ) : <EOL> def __init__ ( self , node_list , macro_registry = DefaultMacroRegistry ( ) ) : <EOL> self . node_list = node_list <EOL> self . macro_registry = macro_registry <EOL> def translate ( self ) : <EOL> output = '<STR_LIT>' <EOL> for node in self . node_list : <EOL> if isinstance ( node , TextNode ) : <EOL> output += node . token . replace ( '<STR_LIT:.>' , '<STR_LIT>' ) <EOL> elif isinstance ( node , WildcardNode ) : <EOL> output += '<STR_LIT>' <EOL> elif isinstance ( node , OptionalNode ) : <EOL> output += '<STR_LIT:(>' + RegexScribe ( node . node_list ) . translate ( ) + '<STR_LIT>' <EOL> elif isinstance ( node , TagNode ) : <EOL> if isinstance ( node , MacroTagNode ) : <EOL> regex = self . macro_registry . get ( node . macro ) <EOL> elif isinstance ( node , RegexTagNode ) : <EOL> regex = node . regex <EOL> else : <EOL> regex = '<STR_LIT>' <EOL> if node . name : <EOL> output += '<STR_LIT>' % ( node . name , regex ) <EOL> else : <EOL> output += regex <EOL> return output <EOL> def get_all_nodes ( node_list ) : <EOL> for node in node_list : <EOL> if isinstance ( node , BlockNode ) : <EOL> for node in get_all_nodes ( node . node_list ) : <EOL> yield node <EOL> else : <EOL> yield node </s>
