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118 lines
3.6 KiB
118 lines
3.6 KiB
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import functools
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from .. import This, DatumInContext, JSONPath
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class SortedThis(This):
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"""The JSONPath referring to the sorted version of the current object.
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Concrete syntax is '`sorted`' or [\\field,/field].
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"""
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def __init__(self, expressions=None):
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self.expressions = expressions
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def _compare(self, left, right):
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left = DatumInContext.wrap(left)
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right = DatumInContext.wrap(right)
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for expr in self.expressions:
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field, reverse = expr
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l_datum = field.find(left)
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r_datum = field.find(right)
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if (not l_datum or not r_datum or
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len(l_datum) > 1 or len(r_datum) > 1 or
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l_datum[0].value == r_datum[0].value):
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# NOTE(sileht): should we do something if the expression
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# match multiple fields, for now ignore them
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continue
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elif l_datum[0].value < r_datum[0].value:
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return 1 if reverse else -1
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else:
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return -1 if reverse else 1
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return 0
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def find(self, datum):
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"""Return sorted value of This if list or dict."""
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if isinstance(datum.value, dict) and self.expressions:
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return datum
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if isinstance(datum.value, dict) or isinstance(datum.value, list):
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key = (functools.cmp_to_key(self._compare)
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if self.expressions else None)
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return [DatumInContext.wrap(
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[value for value in sorted(datum.value, key=key)])]
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return datum
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def __eq__(self, other):
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return isinstance(other, Len)
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def __repr__(self):
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return '%s(%r)' % (self.__class__.__name__, self.expressions)
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def __str__(self):
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return '[?%s]' % self.expressions
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class Len(JSONPath):
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"""The JSONPath referring to the len of the current object.
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Concrete syntax is '`len`'.
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"""
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def find(self, datum):
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datum = DatumInContext.wrap(datum)
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try:
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value = len(datum.value)
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except TypeError:
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return []
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else:
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return [DatumInContext(value,
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context=None,
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path=Len())]
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def __eq__(self, other):
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return isinstance(other, Len)
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def __str__(self):
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return '`len`'
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def __repr__(self):
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return 'Len()'
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class Keys(JSONPath):
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"""The JSONPath referring to the keys of the current object.
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Concrete syntax is '`keys`'.
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"""
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def find(self, datum):
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datum = DatumInContext.wrap(datum)
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try:
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value = list(datum.value.keys())
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except Exception as e:
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return []
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else:
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return [DatumInContext(value[i],
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context=None,
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path=Keys()) for i in range (0, len(datum.value))]
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def __eq__(self, other):
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return isinstance(other, Keys)
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def __str__(self):
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return '`keys`'
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def __repr__(self):
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return 'Keys()'
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