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# -*- coding: utf-8 -*-

# Copyright (C) 2008 Andi Albrecht, albrecht.andi@gmail.com
#
# This module is part of python-sqlparse and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php.

"""SQL Lexer"""

# This code is based on the SqlLexer in pygments.
# http://pygments.org/
# It's separated from the rest of pygments to increase performance
# and to allow some customizations.

import re

from debug_toolbar.utils.sqlparse import tokens
from debug_toolbar.utils.sqlparse.keywords import KEYWORDS, KEYWORDS_COMMON


class include(str):
    pass


class combined(tuple):
    """Indicates a state combined from multiple states."""

    def __new__(cls, *args):
        return tuple.__new__(cls, args)

    def __init__(self, *args):
        # tuple.__init__ doesn't do anything
        pass


def is_keyword(value):
    test = value.upper()
    return KEYWORDS_COMMON.get(test, KEYWORDS.get(test, tokens.Name)), value


def apply_filters(stream, filters, lexer=None):
    """
    Use this method to apply an iterable of filters to
    a stream. If lexer is given it's forwarded to the
    filter, otherwise the filter receives `None`.
    """

    def _apply(filter_, stream):
        for token in filter_.filter(lexer, stream):
            yield token

    for filter_ in filters:
        stream = _apply(filter_, stream)
    return stream


class LexerMeta(type):
    """
    Metaclass for Lexer, creates the self._tokens attribute from
    self.tokens on the first instantiation.
    """

    def _process_state(cls, unprocessed, processed, state):
        assert type(state) is str, "wrong state name %r" % state
        assert state[0] != '#', "invalid state name %r" % state
        if state in processed:
            return processed[state]
        tokenlist = processed[state] = []
        rflags = cls.flags
        for tdef in unprocessed[state]:
            if isinstance(tdef, include):
                # it's a state reference
                assert tdef != state, "circular state reference %r" % state
                tokenlist.extend(cls._process_state(
                    unprocessed, processed, str(tdef)))
                continue

            assert type(tdef) is tuple, "wrong rule def %r" % tdef

            try:
                rex = re.compile(tdef[0], rflags).match
            except Exception, err:
                raise ValueError(("uncompilable regex %r in state"
                                  " %r of %r: %s"
                                  % (tdef[0], state, cls, err)))

            assert type(tdef[1]) is tokens._TokenType or callable(tdef[1]), \
                   ('token type must be simple type or callable, not %r'
                    % (tdef[1],))

            if len(tdef) == 2:
                new_state = None
            else:
                tdef2 = tdef[2]
                if isinstance(tdef2, str):
                    # an existing state
                    if tdef2 == '#pop':
                        new_state = -1
                    elif tdef2 in unprocessed:
                        new_state = (tdef2,)
                    elif tdef2 == '#push':
                        new_state = tdef2
                    elif tdef2[:5] == '#pop:':
                        new_state = -int(tdef2[5:])
                    else:
                        assert False, 'unknown new state %r' % tdef2
                elif isinstance(tdef2, combined):
                    # combine a new state from existing ones
                    new_state = '_tmp_%d' % cls._tmpname
                    cls._tmpname += 1
                    itokens = []
                    for istate in tdef2:
                        assert istate != state, \
                               'circular state ref %r' % istate
                        itokens.extend(cls._process_state(unprocessed,
                                                          processed, istate))
                    processed[new_state] = itokens
                    new_state = (new_state,)
                elif isinstance(tdef2, tuple):
                    # push more than one state
                    for state in tdef2:
                        assert (state in unprocessed or
                                state in ('#pop',


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