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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 functools
from .. import This, DatumInContext, JSONPath
class SortedThis(This):
"""The JSONPath referring to the sorted version of the current object.
Concrete syntax is '`sorted`' or [\\field,/field].
"""
def __init__(self, expressions=None):
self.expressions = expressions
def _compare(self, left, right):
left = DatumInContext.wrap(left)
right = DatumInContext.wrap(right)
for expr in self.expressions:
field, reverse = expr
l_datum = field.find(left)
r_datum = field.find(right)
if (not l_datum or not r_datum or
len(l_datum) > 1 or len(r_datum) > 1 or
l_datum[0].value == r_datum[0].value):
# NOTE(sileht): should we do something if the expression
# match multiple fields, for now ignore them
continue
elif l_datum[0].value < r_datum[0].value:
return 1 if reverse else -1
else:
return -1 if reverse else 1
return 0
def find(self, datum):
"""Return sorted value of This if list or dict."""
if isinstance(datum.value, dict) and self.expressions:
return datum
if isinstance(datum.value, dict) or isinstance(datum.value, list):
key = (functools.cmp_to_key(self._compare)
if self.expressions else None)
return [DatumInContext.wrap(
[value for value in sorted(datum.value, key=key)])]
return datum
def __eq__(self, other):
return isinstance(other, Len)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, self.expressions)
def __str__(self):
return '[?%s]' % self.expressions
class Len(JSONPath):
"""The JSONPath referring to the len of the current object.
Concrete syntax is '`len`'.
"""
def find(self, datum):
datum = DatumInContext.wrap(datum)
try:
value = len(datum.value)
except TypeError:
return []
else:
return [DatumInContext(value,
context=None,
path=Len())]
def __eq__(self, other):
return isinstance(other, Len)
def __str__(self):
return '`len`'
def __repr__(self):
return 'Len()'
class Keys(JSONPath):
"""The JSONPath referring to the keys of the current object.
Concrete syntax is '`keys`'.
"""
def find(self, datum):
datum = DatumInContext.wrap(datum)
try:
value = list(datum.value.keys())
except Exception as e:
return []
else:
return [DatumInContext(value[i],
context=None,
path=Keys()) for i in range (0, len(datum.value))]
def __eq__(self, other):
return isinstance(other, Keys)
def __str__(self):
return '`keys`'
def __repr__(self):
return 'Keys()'
class Path(JSONPath):
"""The JSONPath referring to the path of the current object.
Concrete syntax is 'path`'.
"""
def find(self, datum):
datum = DatumInContext.wrap(datum)
try:
value = str(datum.path)
except Exception as e:
return []
else:
return [DatumInContext(value,
context=datum,
path=Path())]
def __eq__(self, other):
return isinstance(other, Path)
def __str__(self):
return '`path`'
def __repr__(self):
return 'Path()'
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