# Path: pydsl/lex.py
# def lexer_factory(alphabet, base, force_lexer = None):
#     if force_lexer is None:
#         if alphabet == ascii_encoding:
#             force_lexer = "lexer"
#         elif isinstance(alphabet, Choice) and alphabet.alphabet == base:
#             force_lexer = "brute_force"
#         else:
#             force_lexer = "general"
#         
#     if force_lexer == "lexer":
#         return ChoiceLexer(alphabet)
#     elif force_lexer == "brute_force":
#         return ChoiceBruteForceLexer(alphabet)
#     elif force_lexer == "general":
#         return GeneralLexer(alphabet, base)
#     else:
#         raise ValueError
# 
# Path: pydsl/encoding.py



from pydsl.lex import lexer_factory
from pydsl.encoding import ascii_encoding
        from pydsl.check import check
        from pydsl.tree import ParseTree
    from pydsl.grammar.BNF import BNFGrammar
            from pydsl.parser.backtracing import BacktracingErrorRecursiveDescentParser
            from pydsl.parser.LR0 import LR0Parser
            from pydsl.parser.LL import LL1RecursiveDescentParser
import logging
class Parser(object):
    """Expands an input based on grammar rules
    At this time, all parsers are tree based"""
    def __init__(self, productionset):
        self._productionset = productionset
    def get_trees(self, word): # -> list:
        """ returns a ParseTree list with all guesses """
        raise NotImplementedError

    def __call__(self, word):
        return self.get_trees(word)

    @property
    def productionset(self):
        """returns productionset"""
        return self._productionset

class TopDownParser(Parser):
    """Top down parser like descent parser"""
    def _reduce_terminal(self, symbol, data, showerrors = False):
        result = check(symbol.gd, [data])
        if result:
            return [ParseTree(0,1, symbol , data)]
        if showerrors and not result:
            return [ParseTree(0,1, symbol , data, valid = False)]
        return []

class BottomUpParser(Parser):
    """ leaf to root parser"""
    def __init__(self, bnfgrammar):

# Path: pydsl/lex.py
# def lexer_factory(alphabet, base, force_lexer = None):
#     if force_lexer is None:
#         if alphabet == ascii_encoding:
#             force_lexer = "lexer"
#         elif isinstance(alphabet, Choice) and alphabet.alphabet == base:
#             force_lexer = "brute_force"
#         else:
#             force_lexer = "general"
#         
#     if force_lexer == "lexer":
#         return ChoiceLexer(alphabet)
#     elif force_lexer == "brute_force":
#         return ChoiceBruteForceLexer(alphabet)
#     elif force_lexer == "general":
#         return GeneralLexer(alphabet, base)
#     else:
#         raise ValueError
# 
# Path: pydsl/encoding.py



# Path: pydsl/parser/parser.py
from pydsl.lex import lexer_factory
from pydsl.encoding import ascii_encoding
        from pydsl.check import check
        from pydsl.tree import ParseTree
    from pydsl.grammar.BNF import BNFGrammar
            from pydsl.parser.backtracing import BacktracingErrorRecursiveDescentParser
            from pydsl.parser.LR0 import LR0Parser
            from pydsl.parser.LL import LL1RecursiveDescentParser
import logging

class Parser(object):
    """Expands an input based on grammar rules
    At this time, all parsers are tree based"""
    def __init__(self, productionset):
        self._productionset = productionset
    def get_trees(self, word): # -> list:
        """ returns a ParseTree list with all guesses """
        raise NotImplementedError

    def __call__(self, word):
        return self.get_trees(word)

    @property
    def productionset(self):
        """returns productionset"""
        return self._productionset

class TopDownParser(Parser):
    """Top down parser like descent parser"""
    def _reduce_terminal(self, symbol, data, showerrors = False):
        result = check(symbol.gd, [data])
        if result:
            return [ParseTree(0,1, symbol , data)]
        if showerrors and not result:
            return [ParseTree(0,1, symbol , data, valid = False)]
        return []

class BottomUpParser(Parser):
    """ leaf to root parser"""
    def __init__(self, bnfgrammar):

        self._lexer = lexer_factory(bnfgrammar.alphabet, ascii_encoding)