/usr/lib/python2.7/dist-packages/twext/who/expression.py is in python-twext 0.1.b2.dev15059-1.
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The actual contents of the file can be viewed below.
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##
# Copyright (c) 2013-2015 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
"""
Directory query expressions.
"""
__all__ = [
"Operand",
"BooleanExpression",
"CompoundExpression",
"ExistsExpression",
"MatchType",
"MatchFlags",
"MatchExpression",
]
from twisted.python.constants import (
Names, NamedConstant, Flags, FlagConstant,
)
from .idirectory import FieldName
from .util import describe
#
# Compound expression
#
class Operand(Names):
"""
Contants for common operands.
"""
OR = NamedConstant()
AND = NamedConstant()
OR.description = u"or"
AND.description = u"and"
class CompoundExpression(object):
"""
An expression that groups multiple expressions with an operand.
@ivar expressions: An iterable of expressions.
@ivar operand: A L{NamedConstant} specifying an operand.
"""
def __init__(self, expressions, operand):
self.expressions = tuple(expressions)
self.operand = operand
def __repr__(self):
return (
"<{self.__class__.__name__}: "
"{self.expressions!r} {self.operand!r}>"
.format(self=self)
)
def __eq__(self, other):
if isinstance(other, CompoundExpression):
return (
(self.operand is other.operand) and
(self.expressions == other.expressions)
)
else:
return NotImplemented
#
# Match expression
#
class MatchType(Names):
"""
Query match types.
"""
equals = NamedConstant()
equals.description = u"equals"
startsWith = NamedConstant()
startsWith.description = u"starts with"
endsWith = NamedConstant()
endsWith.description = u"ends with"
contains = NamedConstant()
contains.description = u"contains"
lessThan = NamedConstant()
lessThan.description = u"less than"
greaterThan = NamedConstant()
greaterThan.description = u"greater than"
lessThanOrEqualTo = NamedConstant()
lessThanOrEqualTo.description = u"less than or equal to"
greaterThanOrEqualTo = NamedConstant()
greaterThanOrEqualTo.description = u"greater than or equal to"
class MatchFlags(Flags):
"""
Match expression flags.
"""
NOT = FlagConstant()
NOT.description = u"not"
caseInsensitive = FlagConstant()
caseInsensitive.description = u"case insensitive"
none = None
@staticmethod
def _setMatchFunctions(flags):
"""
Compute a predicate and normalize functions for the given match
expression flags.
@param flags: Match expression flags.
@type flags: L{MatchFlags}
@return: Predicate and normalize functions.
@rtype: L{tuple} of callables.
"""
predicate = lambda x: x
normalize = lambda x: x
def caseInsensitivify(x):
# Case insensitive only makes sense conceptually for text
# Note we are intentionally not treating bytes as text
if isinstance(x, unicode):
return x.lower()
else:
return x
if flags is None:
flags = FlagConstant()
else:
for flag in flags:
if flag == MatchFlags.NOT:
predicate = lambda x: not x
elif flag == MatchFlags.caseInsensitive:
normalize = caseInsensitivify
else:
raise NotImplementedError(
"Unknown query flag: {0}".format(describe(flag))
)
flags._predicate = predicate
flags._normalize = normalize
return flags
@staticmethod
def predicator(flags):
"""
Determine a predicate function for the given flags.
@param flags: Match expression flags.
@type flags: L{MatchFlags}
@return: a L{callable} that accepts an L{object} argument and returns a
L{object} that has the opposite or same truth value as the argument,
depending on whether L{MatchFlags.NOT} is or is not in C{flags}.
@rtype: callable
"""
if not hasattr(flags, "_predicate"):
flags = MatchFlags._setMatchFunctions(flags)
return flags._predicate
@staticmethod
def normalizer(flags):
"""
Determine a normalize function for the given flags.
@param flags: Match expression flags.
@type flags: L{MatchFlags}
@return: a L{callable} that accepts a L{unicode} and returns the same
L{unicode} or a normalized L{unicode} that can be compared with other
normalized L{unicode}s in a case-insensitive fashion, depending on
whether L{MatchFlags.caseInsensitive} is not or is in C{flags}.
@rtype: callable
"""
if not hasattr(flags, "_normalize"):
flags = MatchFlags._setMatchFunctions(flags)
return flags._normalize
# Lame way to create a FlagsConstant with no flags in it:
MatchFlags.none = MatchFlags.NOT & MatchFlags.caseInsensitive
class MatchExpression(object):
"""
Query for a matching value in a given field.
@ivar fieldName: A L{NamedConstant} specifying the field.
@ivar fieldValue: A value to match.
@ivar matchType: A L{NamedConstant} specifying the match algorithm.
@ivar flags: A L{NamedConstant} specifying additional options.
"""
def __init__(
self,
fieldName, fieldValue,
matchType=MatchType.equals, flags=MatchFlags.none
):
if not isinstance(fieldName, NamedConstant):
raise TypeError(
"Field name {name} in match expression is not a NamedConstant."
.format(name=fieldName)
)
valueType = FieldName.valueType(fieldName)
if not isinstance(fieldValue, valueType):
raise TypeError(
"Field value {value!r} for field {field} in match expression "
"is not of expected type {type}."
.format(value=fieldValue, field=fieldName, type=valueType)
)
self.fieldName = fieldName
self.fieldValue = fieldValue
self.matchType = matchType
self.flags = flags
def __repr__(self):
if self.flags.value == 0:
flags = ""
else:
flags = " ({0})".format(describe(self.flags))
return (
"<{self.__class__.__name__}: {fieldName!r} "
"{matchType} {fieldValue!r}{flags}>"
.format(
self=self,
fieldName=describe(self.fieldName),
matchType=describe(self.matchType),
fieldValue=describe(self.fieldValue),
flags=flags,
)
)
def __eq__(self, other):
if isinstance(other, MatchExpression):
return (
(self.fieldName is other.fieldName) and
(self.matchType is other.matchType) and
(set(self.flags) == set(other.flags)) and
(self.fieldValue == other.fieldValue)
)
else:
return NotImplemented
def match(self, value):
"""
Test whether this expression's field value matches against a given
value according to this expression's match type and match flags.
@param value: The value to match against.
@type value: L{object}
@return: C{True} if this expression matches C{value}; L{False}
otherwise.
@rtype: L{bool}
"""
predicate = MatchFlags.predicator(self.flags)
normalize = MatchFlags.normalizer(self.flags)
def match(a, b):
matchType = self.matchType
if matchType == MatchType.equals:
return a == b
if matchType == MatchType.startsWith:
return a.startswith(b)
if matchType == MatchType.endsWith:
return a.endswith(b)
if matchType == MatchType.contains:
return b in a
if matchType == MatchType.lessThan:
return a < b
if matchType == MatchType.greaterThan:
return a > b
if matchType == MatchType.lessThanOrEqualTo:
return a <= b
if matchType == MatchType.greaterThanOrEqualTo:
return a >= b
raise NotImplementedError(
"Unknown match type: {0!r}".format(matchType)
)
return predicate(match(
normalize(value), normalize(self.fieldValue)
))
class ExistsExpression(object):
"""
Query for the existence a given field.
@ivar fieldName: A L{NamedConstant} specifying the field.
"""
def __init__(self, fieldName):
if not isinstance(fieldName, NamedConstant):
raise TypeError(
"Field name {name} in exists expression is not a NamedConstant."
.format(name=fieldName)
)
self.fieldName = fieldName
def __repr__(self):
return (
"<{self.__class__.__name__}: {fieldName!r} "
.format(
self=self,
fieldName=describe(self.fieldName),
)
)
def __eq__(self, other):
if isinstance(other, ExistsExpression):
return (self.fieldName is other.fieldName)
else:
return NotImplemented
class BooleanExpression(object):
"""
Query for the "True" value of a given field.
@ivar fieldName: A L{NamedConstant} specifying the field.
"""
def __init__(self, fieldName):
if not isinstance(fieldName, NamedConstant):
raise TypeError(
"Field name {name} in boolean expression is not a NamedConstant."
.format(name=fieldName)
)
self.fieldName = fieldName
def __repr__(self):
return (
"<{self.__class__.__name__}: {fieldName!r} "
.format(
self=self,
fieldName=describe(self.fieldName),
)
)
def __eq__(self, other):
if isinstance(other, BooleanExpression):
return (self.fieldName is other.fieldName)
else:
return NotImplemented
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