88 lines
2.2 KiB
C
88 lines
2.2 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 <string>
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#include <vector>
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#include <folly/Expected.h>
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#include <folly/Range.h>
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namespace folly {
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/*
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* json_pointer
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*
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* As described in RFC 6901 "JSON Pointer".
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*
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* Implements parsing. Traversal using the pointer over data structures must be
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* implemented separately.
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*/
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class json_pointer {
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public:
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enum class parse_error {
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invalid_first_character,
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invalid_escape_sequence,
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};
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class parse_exception : public std::runtime_error {
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using std::runtime_error::runtime_error;
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};
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json_pointer() = default;
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~json_pointer() = default;
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/*
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* Parse string into vector of unescaped tokens.
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* Non-throwing and throwing versions.
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*/
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static Expected<json_pointer, parse_error> try_parse(StringPiece const str);
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static json_pointer parse(StringPiece const str);
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/*
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* Return true if this pointer is proper to prefix to another pointer
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*/
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bool is_prefix_of(json_pointer const& other) const noexcept;
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/*
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* Get access to the parsed tokens for applications that want to traverse
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* the pointer.
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*/
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std::vector<std::string> const& tokens() const;
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friend bool operator==(json_pointer const& lhs, json_pointer const& rhs) {
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return lhs.tokens_ == rhs.tokens_;
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}
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friend bool operator!=(json_pointer const& lhs, json_pointer const& rhs) {
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return lhs.tokens_ != rhs.tokens_;
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}
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private:
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explicit json_pointer(std::vector<std::string>) noexcept;
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/*
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* Unescape the specified escape sequences, returns false if incorrect
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*/
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static bool unescape(std::string&);
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std::vector<std::string> tokens_;
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};
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} // namespace folly
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