syntactic_step_parser.py 文件源码

def build(self, **kwargs):
    """ the start attribute is mandatory !
        When calling the method with a start distinct from expression you may get the following message
        WARNING: Symbol 'expression' is unreachable
        Nothing to be aware of
    """

    # keep track of 

    # # start the parser
    # start = 'expression'
    # if 'start' in kwargs.keys(): # MANDATORY
    #   start = kwargs['start'] 
    # kwargs.pop('start', None)      
    # debugging and logging http://www.dabeaz.com/ply/ply.html#ply_nn44 
    #self.parser = yacc.yacc(module=self, start=start, errorlog=yacc.NullLogger(), debug = False, **kwargs) 
    self.parser = yacc.yacc(module=self, start='step', errorlog=yacc.NullLogger(), debug = False, **kwargs) 

    # https://github.com/dabeaz/ply/blob/master/ply/yacc.py
    # debug yaccdebug   = True        # Debugging mode.  If set, yacc generates a
                               # a 'parser.out' file in the current directory

# """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
#  MAIN
# """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""


# example use: