<s> __author__ = """<STR_LIT>""" <EOL> if __name__ == '<STR_LIT:__main__>' : <EOL> from os import getcwd <EOL> from os import sys <EOL> sys . path . append ( getcwd ( ) ) <EOL> from MOAL . helpers . display import Section <EOL> from MOAL . helpers . display import prnt <EOL> from MOAL . helpers . text import uniqchars <EOL> from MOAL . languages . formal_language_theory . grammars import context_free <EOL> from random import randrange as rr <EOL> class AttributeContextFreeGrammar ( context_free . ContextFreeGrammar ) : <EOL> """<STR_LIT>""" <EOL> def __init__ ( self ) : <EOL> super ( AttributeContextFreeGrammar , self ) . __init__ ( ) <EOL> self . attr_token = '<STR_LIT:.>' <EOL> self . terminus = '<STR_LIT:$>' <EOL> self . DEBUG = True <EOL> def __getitem__ ( self , attr ) : <EOL> if attr == '<STR_LIT>' : <EOL> return self . _prop <EOL> elif attr == '<STR_LIT:value>' : <EOL> return self . _value <EOL> elif attr == '<STR_LIT>' : <EOL> return self . _len <EOL> elif attr == '<STR_LIT>' : <EOL> return self . _chars <EOL> else : <EOL> return '<STR_LIT>' <EOL> def _len ( self , token ) : <EOL> return '<STR_LIT>' . format ( len ( token ) ) <EOL> def _prop ( self , token ) : <EOL> return '<STR_LIT>' . format ( token . upper ( ) ) <EOL> def _value ( self , token ) : <EOL> return '<STR_LIT>' . format ( rr ( len ( token ) , <NUM_LIT> ) ) <EOL> def _chars ( self , token ) : <EOL> return '<STR_LIT>' . format ( uniqchars ( len ( token ) ) ) <EOL> def _parse_terminal ( self , attr , token ) : <EOL> """<STR_LIT>""" <EOL> return str ( self [ attr ] ( token ) ) <EOL> def _attr ( self , semantic_rule ) : <EOL> """<STR_LIT>""" <EOL> return semantic_rule . replace ( <EOL> self . terminus , '<STR_LIT>' ) . replace ( '<STR_LIT:U+0020>' , '<STR_LIT>' ) . split ( self . attr_token ) [ <NUM_LIT:1> ] <EOL> def evaluate ( self , tokens , evaluation = '<STR_LIT>' ) : <EOL> """<STR_LIT>""" <EOL> if self . DEBUG : <EOL> prnt ( '<STR_LIT>' , self . rules ) <EOL> print ( '<STR_LIT>' . format ( tokens ) ) <EOL> for token in tokens : <EOL> for rule in self . rules : <EOL> left , right = rule <EOL> print ( '<STR_LIT>' . format ( left , right ) ) <EOL> if token == left : <EOL> is_attr = self . attr_token in right <EOL> is_terminal = right . endswith ( self . terminus ) <EOL> if is_attr and is_terminal : <EOL> print ( '<STR_LIT>' . format ( token ) ) <EOL> evaluation += self . _parse_terminal ( <EOL> self . _attr ( right ) , token ) <EOL> else : <EOL> non_terms = list ( right ) <EOL> print ( '<STR_LIT>' . format ( non_terms ) ) <EOL> evaluation += self . evaluate ( <EOL> non_terms , evaluation = evaluation ) <EOL> return evaluation <EOL> if __name__ == '<STR_LIT:__main__>' : <EOL> with Section ( '<STR_LIT>' ) : <EOL> attribute_cfg = AttributeContextFreeGrammar ( ) <EOL> rule_templates = [ <EOL> '<STR_LIT>' , <EOL> '<STR_LIT>' , <EOL> '<STR_LIT>' , <EOL> '<STR_LIT>' , <EOL> '<STR_LIT>' , <EOL> ] <EOL> map ( attribute_cfg . add_rule , rule_templates ) <EOL> prnt ( <EOL> '<STR_LIT>' , <EOL> attribute_cfg . evaluate ( [ '<STR_LIT>' , '<STR_LIT>' , '<STR_LIT>' , '<STR_LIT:X>' , '<STR_LIT:S>' , '<STR_LIT:T>' ] ) ) </s>
