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#
# 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.
import operator
import re
from .. import JSONPath, DatumInContext, Index
OPERATOR_MAP = {
'!=': operator.ne,
'==': operator.eq,
'=': operator.eq,
'<=': operator.le,
'<': operator.lt,
'>=': operator.ge,
'>': operator.gt,
'=~': lambda a, b: True if isinstance(a, str) and re.search(b, a) else False,
}
class Filter(JSONPath):
"""The JSONQuery filter"""
def __init__(self, expressions):
self.expressions = expressions
def find(self, datum):
if not self.expressions:
return datum
datum = DatumInContext.wrap(datum)
if isinstance(datum.value, dict):
datum.value = list(datum.value.values())
if not isinstance(datum.value, list):
return []
return [DatumInContext(datum.value[i], path=Index(i), context=datum)
for i in range(0, len(datum.value))
if (len(self.expressions) ==
len(list(filter(lambda x: x.find(datum.value[i]),
self.expressions))))]
def filter(self, fn, data):
# NOTE: We reverse the order just to make sure the indexes are preserved upon
# removal.
for datum in reversed(self.find(data)):
index_obj = datum.path
if isinstance(data, dict):
index_obj.index = list(data)[index_obj.index]
index_obj.filter(fn, data)
return data
def update(self, data, val):
if type(data) is list:
for index, item in enumerate(data):
shouldUpdate = len(self.expressions) == len(list(filter(lambda x: x.find(item), self.expressions)))
if shouldUpdate:
if hasattr(val, '__call__'):
val.__call__(data[index], data, index)
else:
data[index] = val
return data
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, self.expressions)
def __str__(self):
return '[?%s]' % self.expressions
def __eq__(self, other):
return (isinstance(other, Filter)
and self.expressions == other.expressions)
class Expression(JSONPath):
"""The JSONQuery expression"""
def __init__(self, target, op, value):
self.target = target
self.op = op
self.value = value
def find(self, datum):
datum = self.target.find(DatumInContext.wrap(datum))
if not datum:
return []
if self.op is None:
return datum
found = []
for data in datum:
value = data.value
if isinstance(self.value, int):
try:
value = int(value)
except ValueError:
continue
elif isinstance(self.value, bool):
try:
value = bool(value)
except ValueError:
continue
if OPERATOR_MAP[self.op](value, self.value):
found.append(data)
return found
def __eq__(self, other):
return (isinstance(other, Expression) and
self.target == other.target and
self.op == other.op and
self.value == other.value)
def __repr__(self):
if self.op is None:
return '%s(%r)' % (self.__class__.__name__, self.target)
else:
return '%s(%r %s %r)' % (self.__class__.__name__,
self.target, self.op, self.value)
def __str__(self):
if self.op is None:
return '%s' % self.target
else:
return '%s %s %s' % (self.target, self.op, self.value)
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