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# EFILTER Forensic Query Language
#
# Copyright 2015 Google 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.
"""
EFILTER abstract syntax.
"""
__author__ = "Adam Sindelar <adamsh@google.com>"
class EfilterError(Exception):
query = None
_root = None
message = None
start = None
end = None
def __init__(self, query=None, message=None, root=None, start=None,
end=None):
super(EfilterError, self).__init__(message)
self.query = query
self.message = message
self.root = root
if start is not None:
self.start = start
if end is not None:
self.end = end
@property
def root(self):
return self._root
@root.setter
def root(self, value):
self._root = value
try:
self.start = value.start
self.end = value.end
except AttributeError:
self.start = None
self.end = None
@property
def text(self):
return self.message
@property
def adjusted_start(self):
"""Start of the error in self.source (with the >>> and <<< delims)."""
if self.start is not None:
return self.start
@property
def adjusted_end(self):
"""End of the error in self.source (with the >>> and <<< delims)."""
if self.end is not None:
return self.end + 9
@property
def source(self):
if not self.query:
return None
if self.start is not None and self.end is not None:
return "%s >>> %s <<< %s" % (
self.query[0:self.start],
self.query[self.start:self.end],
self.query[self.end:])
elif self.query:
return self.query
def __str__(self):
return "%s (%s) in query %r" % (
type(self).__name__,
self.text,
self.source)
def __repr__(self):
return "%s(message=%r, start=%r, end=%r)" % (
type(self), self.message, self.start, self.end)
class EfilterLogicError(EfilterError):
pass
class EfilterNoneError(EfilterError):
pass
class EfilterParseError(EfilterError):
token = None
def __init__(self, *args, **kwargs):
self.token = kwargs.pop("token", None)
super(EfilterParseError, self).__init__(*args, **kwargs)
class EfilterKeyError(EfilterError):
key = None
@property
def text(self):
if self.message:
return self.message
if self.key:
return "No such key %r." % self.key
return None
def __init__(self, *args, **kwargs):
self.key = kwargs.pop("key", None)
super(EfilterKeyError, self).__init__(*args, **kwargs)
class EfilterTypeError(EfilterError):
expected = None
actual = None
@property
def text(self):
if self.message:
return self.message
if self.expected and self.actual:
return "Expected type %r, got %r instead." % (self.expected,
self.actual)
return None
def __init__(self, *args, **kwargs):
self.expected = kwargs.pop("expected", None)
self.actual = kwargs.pop("actual", None)
super(EfilterTypeError, self).__init__(*args, **kwargs)
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