# Path: pyston/filters/filters.py
# OPERATORS = Enum(
#     ('GT', 'gt'),
#     ('LT', 'lt'),
#     ('EQ', 'eq'),
#     ('NEQ', 'neq'),
#     ('LTE', 'lte'),
#     ('GTE', 'gte'),
#     ('CONTAINS', 'contains'),
#     ('ICONTAINS', 'icontains'),
#     ('RANGE', 'range'),
#     ('EXACT', 'exact'),
#     ('IEXACT', 'iexact'),
#     ('STARTSWITH', 'startswith'),
#     ('ISTARTSWITH', 'istartswith'),
#     ('ENDSWITH', 'endswith'),
#     ('IENDSWITH', 'iendswith'),
#     ('IN', 'in'),
#     ('RANGE', 'range'),
#     ('ALL', 'all'),
#     ('ISNULL', 'isnull'),
# )
# 
# Path: pyston/filters/utils.py
# LOGICAL_OPERATORS = Enum(
#     'AND',
#     'OR',
#     'NOT',
# )


import re
import pyparsing as pp
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext
from .filters import OPERATORS
from .utils import LOGICAL_OPERATORS
class FilterParser:
    """
    Abstract filter parser.
    """

    def parse(self, request):
        """
        :param request: Django HTTP request.
        :return: returns conditions tree or None.
        """
        raise NotImplementedError


class DefaultFilterParser(FilterParser):
    """
    Parser for complex filter terms.
    E.q.:
       /api/user?filter=created_at__moth=5 AND NOT (contract=null OR first_name='Petr')
    """

    ALLOWED_OPERATORS = (
        '=',
        '!=',
        '>=',
        '<=',
        '>',
        '<',
        '[a-z]+'
    )
    OPERATORS_MAPPING = {

# Path: pyston/filters/filters.py
# OPERATORS = Enum(
#     ('GT', 'gt'),
#     ('LT', 'lt'),
#     ('EQ', 'eq'),
#     ('NEQ', 'neq'),
#     ('LTE', 'lte'),
#     ('GTE', 'gte'),
#     ('CONTAINS', 'contains'),
#     ('ICONTAINS', 'icontains'),
#     ('RANGE', 'range'),
#     ('EXACT', 'exact'),
#     ('IEXACT', 'iexact'),
#     ('STARTSWITH', 'startswith'),
#     ('ISTARTSWITH', 'istartswith'),
#     ('ENDSWITH', 'endswith'),
#     ('IENDSWITH', 'iendswith'),
#     ('IN', 'in'),
#     ('RANGE', 'range'),
#     ('ALL', 'all'),
#     ('ISNULL', 'isnull'),
# )
# 
# Path: pyston/filters/utils.py
# LOGICAL_OPERATORS = Enum(
#     'AND',
#     'OR',
#     'NOT',
# )


# Path: pyston/filters/parser.py
import re
import pyparsing as pp
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext
from .filters import OPERATORS
from .utils import LOGICAL_OPERATORS

class FilterParser:
    """
    Abstract filter parser.
    """

    def parse(self, request):
        """
        :param request: Django HTTP request.
        :return: returns conditions tree or None.
        """
        raise NotImplementedError


class DefaultFilterParser(FilterParser):
    """
    Parser for complex filter terms.
    E.q.:
       /api/user?filter=created_at__moth=5 AND NOT (contract=null OR first_name='Petr')
    """

    ALLOWED_OPERATORS = (
        '=',
        '!=',
        '>=',
        '<=',
        '>',
        '<',
        '[a-z]+'
    )
    OPERATORS_MAPPING = {

        '=': OPERATORS.EQ,