105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
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/*
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* Copyright 2011-present Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <folly/Expected.h>
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#include <folly/Optional.h>
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#include <folly/dynamic.h>
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#include <folly/json_pointer.h>
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namespace folly {
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/*
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* json_patch
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*
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* As described in RFC 6902 "JSON Patch".
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*
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* Implements parsing. Application over data structures must be
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* implemented separately.
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*/
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class json_patch {
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public:
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enum class parse_error_code : uint8_t {
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undefined,
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invalid_shape,
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missing_op,
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unknown_op,
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malformed_op,
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missing_path_attr,
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malformed_path_attr,
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missing_from_attr,
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malformed_from_attr,
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missing_value_attr,
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overlapping_pointers,
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};
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/*
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* If parsing JSON patch object fails we return err code along with
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* pointer to part of JSON document that we could not parse
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*/
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struct parse_error {
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// one of the above error codes
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parse_error_code error_code{parse_error_code::undefined};
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// pointer to object that caused the error
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dynamic const* obj{};
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};
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enum class patch_operation_code : uint8_t {
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invalid = 0,
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test,
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remove,
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add,
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replace,
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move,
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copy,
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};
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/*
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* Single JSON patch operation. Argument may vary based on op type
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*/
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struct patch_operation {
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patch_operation_code op_code{patch_operation_code::invalid};
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json_pointer path;
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Optional<json_pointer> from;
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Optional<dynamic> value;
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friend bool operator==(
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patch_operation const& lhs,
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patch_operation const& rhs) {
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return lhs.op_code == rhs.op_code && lhs.path == rhs.path &&
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lhs.from == rhs.from && lhs.value == rhs.value;
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}
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friend bool operator!=(
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patch_operation const& lhs,
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patch_operation const& rhs) {
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return !(lhs == rhs);
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}
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};
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json_patch() = default;
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~json_patch() = default;
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static folly::Expected<json_patch, parse_error> try_parse(
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dynamic const& obj) noexcept;
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std::vector<patch_operation> const& ops() const;
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private:
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std::vector<patch_operation> ops_;
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};
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} // namespace folly
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