Enhance CMake configuration and add nlohmann/json library files. Updated CMakeLists.txt to include the nlohmann JSON library directory. Added multiple header files for JSON serialization, deserialization, and utility functions, ensuring compatibility with the latest version 3.11.2. This update improves JSON handling capabilities in the project.
This commit is contained in:
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include/nlohmann/detail/input/json_sax.hpp
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728
include/nlohmann/detail/input/json_sax.hpp
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// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++
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// | | |__ | | | | | | version 3.11.2
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2022 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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#pragma once
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#include <cstddef>
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#include <string> // string
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#include <utility> // move
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#include <vector> // vector
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#include <nlohmann/detail/exceptions.hpp>
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#include <nlohmann/detail/macro_scope.hpp>
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#include <nlohmann/detail/string_concat.hpp>
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NLOHMANN_JSON_NAMESPACE_BEGIN
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/*!
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@brief SAX interface
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This class describes the SAX interface used by @ref nlohmann::json::sax_parse.
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Each function is called in different situations while the input is parsed. The
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boolean return value informs the parser whether to continue processing the
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input.
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*/
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template<typename BasicJsonType>
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struct json_sax
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{
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using number_integer_t = typename BasicJsonType::number_integer_t;
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using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
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using number_float_t = typename BasicJsonType::number_float_t;
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using string_t = typename BasicJsonType::string_t;
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using binary_t = typename BasicJsonType::binary_t;
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/*!
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@brief a null value was read
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@return whether parsing should proceed
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*/
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virtual bool null() = 0;
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/*!
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@brief a boolean value was read
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@param[in] val boolean value
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@return whether parsing should proceed
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*/
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virtual bool boolean(bool val) = 0;
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/*!
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@brief an integer number was read
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@param[in] val integer value
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@return whether parsing should proceed
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*/
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virtual bool number_integer(number_integer_t val) = 0;
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/*!
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@brief an unsigned integer number was read
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@param[in] val unsigned integer value
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@return whether parsing should proceed
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*/
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virtual bool number_unsigned(number_unsigned_t val) = 0;
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/*!
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@brief a floating-point number was read
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@param[in] val floating-point value
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@param[in] s raw token value
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@return whether parsing should proceed
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*/
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virtual bool number_float(number_float_t val, const string_t& s) = 0;
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/*!
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@brief a string value was read
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@param[in] val string value
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@return whether parsing should proceed
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@note It is safe to move the passed string value.
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*/
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virtual bool string(string_t& val) = 0;
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/*!
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@brief a binary value was read
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@param[in] val binary value
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@return whether parsing should proceed
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@note It is safe to move the passed binary value.
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*/
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virtual bool binary(binary_t& val) = 0;
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/*!
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@brief the beginning of an object was read
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@param[in] elements number of object elements or -1 if unknown
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@return whether parsing should proceed
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@note binary formats may report the number of elements
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*/
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virtual bool start_object(std::size_t elements) = 0;
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/*!
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@brief an object key was read
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@param[in] val object key
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@return whether parsing should proceed
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@note It is safe to move the passed string.
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*/
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virtual bool key(string_t& val) = 0;
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/*!
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@brief the end of an object was read
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@return whether parsing should proceed
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*/
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virtual bool end_object() = 0;
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/*!
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@brief the beginning of an array was read
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@param[in] elements number of array elements or -1 if unknown
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@return whether parsing should proceed
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@note binary formats may report the number of elements
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*/
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virtual bool start_array(std::size_t elements) = 0;
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/*!
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@brief the end of an array was read
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@return whether parsing should proceed
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*/
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virtual bool end_array() = 0;
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/*!
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@brief a parse error occurred
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@param[in] position the position in the input where the error occurs
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@param[in] last_token the last read token
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@param[in] ex an exception object describing the error
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@return whether parsing should proceed (must return false)
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*/
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virtual bool parse_error(std::size_t position,
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const std::string& last_token,
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const detail::exception& ex) = 0;
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json_sax() = default;
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json_sax(const json_sax&) = default;
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json_sax(json_sax&&) noexcept = default;
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json_sax& operator=(const json_sax&) = default;
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json_sax& operator=(json_sax&&) noexcept = default;
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virtual ~json_sax() = default;
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};
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namespace detail
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{
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/*!
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@brief SAX implementation to create a JSON value from SAX events
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This class implements the @ref json_sax interface and processes the SAX events
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to create a JSON value which makes it basically a DOM parser. The structure or
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hierarchy of the JSON value is managed by the stack `ref_stack` which contains
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a pointer to the respective array or object for each recursion depth.
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After successful parsing, the value that is passed by reference to the
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constructor contains the parsed value.
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@tparam BasicJsonType the JSON type
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*/
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template<typename BasicJsonType>
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class json_sax_dom_parser
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{
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public:
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using number_integer_t = typename BasicJsonType::number_integer_t;
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using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
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using number_float_t = typename BasicJsonType::number_float_t;
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using string_t = typename BasicJsonType::string_t;
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using binary_t = typename BasicJsonType::binary_t;
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/*!
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@param[in,out] r reference to a JSON value that is manipulated while
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parsing
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@param[in] allow_exceptions_ whether parse errors yield exceptions
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*/
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explicit json_sax_dom_parser(BasicJsonType& r, const bool allow_exceptions_ = true)
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: root(r), allow_exceptions(allow_exceptions_)
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{}
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// make class move-only
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json_sax_dom_parser(const json_sax_dom_parser&) = delete;
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json_sax_dom_parser(json_sax_dom_parser&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor)
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json_sax_dom_parser& operator=(const json_sax_dom_parser&) = delete;
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json_sax_dom_parser& operator=(json_sax_dom_parser&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor)
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~json_sax_dom_parser() = default;
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bool null()
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{
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handle_value(nullptr);
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return true;
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}
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bool boolean(bool val)
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{
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handle_value(val);
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return true;
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}
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bool number_integer(number_integer_t val)
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{
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handle_value(val);
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return true;
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}
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bool number_unsigned(number_unsigned_t val)
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{
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handle_value(val);
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return true;
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}
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bool number_float(number_float_t val, const string_t& /*unused*/)
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{
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handle_value(val);
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return true;
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}
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bool string(string_t& val)
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{
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handle_value(val);
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return true;
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}
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bool binary(binary_t& val)
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{
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handle_value(std::move(val));
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return true;
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}
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bool start_object(std::size_t len)
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{
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ref_stack.push_back(handle_value(BasicJsonType::value_t::object));
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if (JSON_HEDLEY_UNLIKELY(len != static_cast<std::size_t>(-1) && len > ref_stack.back()->max_size()))
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{
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JSON_THROW(out_of_range::create(408, concat("excessive object size: ", std::to_string(len)), ref_stack.back()));
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}
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return true;
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}
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bool key(string_t& val)
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{
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JSON_ASSERT(!ref_stack.empty());
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JSON_ASSERT(ref_stack.back()->is_object());
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// add null at given key and store the reference for later
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object_element = &(ref_stack.back()->m_data.m_value.object->operator[](val));
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return true;
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}
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bool end_object()
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{
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JSON_ASSERT(!ref_stack.empty());
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JSON_ASSERT(ref_stack.back()->is_object());
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ref_stack.back()->set_parents();
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ref_stack.pop_back();
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return true;
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}
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bool start_array(std::size_t len)
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{
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ref_stack.push_back(handle_value(BasicJsonType::value_t::array));
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if (JSON_HEDLEY_UNLIKELY(len != static_cast<std::size_t>(-1) && len > ref_stack.back()->max_size()))
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{
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JSON_THROW(out_of_range::create(408, concat("excessive array size: ", std::to_string(len)), ref_stack.back()));
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}
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return true;
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}
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bool end_array()
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{
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JSON_ASSERT(!ref_stack.empty());
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JSON_ASSERT(ref_stack.back()->is_array());
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ref_stack.back()->set_parents();
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ref_stack.pop_back();
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return true;
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}
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template<class Exception>
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bool parse_error(std::size_t /*unused*/, const std::string& /*unused*/,
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const Exception& ex)
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{
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errored = true;
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static_cast<void>(ex);
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if (allow_exceptions)
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{
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JSON_THROW(ex);
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}
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return false;
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}
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constexpr bool is_errored() const
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{
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return errored;
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}
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private:
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/*!
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@invariant If the ref stack is empty, then the passed value will be the new
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root.
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@invariant If the ref stack contains a value, then it is an array or an
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object to which we can add elements
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*/
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template<typename Value>
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JSON_HEDLEY_RETURNS_NON_NULL
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BasicJsonType* handle_value(Value&& v)
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{
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if (ref_stack.empty())
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{
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root = BasicJsonType(std::forward<Value>(v));
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return &root;
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}
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JSON_ASSERT(ref_stack.back()->is_array() || ref_stack.back()->is_object());
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if (ref_stack.back()->is_array())
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{
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ref_stack.back()->m_data.m_value.array->emplace_back(std::forward<Value>(v));
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return &(ref_stack.back()->m_data.m_value.array->back());
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}
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JSON_ASSERT(ref_stack.back()->is_object());
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JSON_ASSERT(object_element);
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*object_element = BasicJsonType(std::forward<Value>(v));
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return object_element;
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}
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/// the parsed JSON value
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BasicJsonType& root;
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/// stack to model hierarchy of values
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std::vector<BasicJsonType*> ref_stack {};
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/// helper to hold the reference for the next object element
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BasicJsonType* object_element = nullptr;
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/// whether a syntax error occurred
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bool errored = false;
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/// whether to throw exceptions in case of errors
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const bool allow_exceptions = true;
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};
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template<typename BasicJsonType>
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class json_sax_dom_callback_parser
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{
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public:
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using number_integer_t = typename BasicJsonType::number_integer_t;
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using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
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using number_float_t = typename BasicJsonType::number_float_t;
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using string_t = typename BasicJsonType::string_t;
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using binary_t = typename BasicJsonType::binary_t;
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using parser_callback_t = typename BasicJsonType::parser_callback_t;
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using parse_event_t = typename BasicJsonType::parse_event_t;
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json_sax_dom_callback_parser(BasicJsonType& r,
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const parser_callback_t cb,
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const bool allow_exceptions_ = true)
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: root(r), callback(cb), allow_exceptions(allow_exceptions_)
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{
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keep_stack.push_back(true);
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}
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// make class move-only
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json_sax_dom_callback_parser(const json_sax_dom_callback_parser&) = delete;
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json_sax_dom_callback_parser(json_sax_dom_callback_parser&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor)
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json_sax_dom_callback_parser& operator=(const json_sax_dom_callback_parser&) = delete;
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json_sax_dom_callback_parser& operator=(json_sax_dom_callback_parser&&) = default; // NOLINT(hicpp-noexcept-move,performance-noexcept-move-constructor)
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~json_sax_dom_callback_parser() = default;
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bool null()
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{
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handle_value(nullptr);
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return true;
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}
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bool boolean(bool val)
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{
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handle_value(val);
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return true;
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}
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bool number_integer(number_integer_t val)
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{
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handle_value(val);
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return true;
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}
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bool number_unsigned(number_unsigned_t val)
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{
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handle_value(val);
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return true;
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}
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bool number_float(number_float_t val, const string_t& /*unused*/)
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||||
{
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handle_value(val);
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return true;
|
||||
}
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bool string(string_t& val)
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{
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handle_value(val);
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return true;
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||||
}
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bool binary(binary_t& val)
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{
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handle_value(std::move(val));
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return true;
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}
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bool start_object(std::size_t len)
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{
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||||
// check callback for object start
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const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::object_start, discarded);
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keep_stack.push_back(keep);
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auto val = handle_value(BasicJsonType::value_t::object, true);
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ref_stack.push_back(val.second);
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|
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// check object limit
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if (ref_stack.back() && JSON_HEDLEY_UNLIKELY(len != static_cast<std::size_t>(-1) && len > ref_stack.back()->max_size()))
|
||||
{
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JSON_THROW(out_of_range::create(408, concat("excessive object size: ", std::to_string(len)), ref_stack.back()));
|
||||
}
|
||||
|
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return true;
|
||||
}
|
||||
|
||||
bool key(string_t& val)
|
||||
{
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||||
BasicJsonType k = BasicJsonType(val);
|
||||
|
||||
// check callback for key
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||||
const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::key, k);
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||||
key_keep_stack.push_back(keep);
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||||
|
||||
// add discarded value at given key and store the reference for later
|
||||
if (keep && ref_stack.back())
|
||||
{
|
||||
object_element = &(ref_stack.back()->m_data.m_value.object->operator[](val) = discarded);
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool end_object()
|
||||
{
|
||||
if (ref_stack.back())
|
||||
{
|
||||
if (!callback(static_cast<int>(ref_stack.size()) - 1, parse_event_t::object_end, *ref_stack.back()))
|
||||
{
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// discard object
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*ref_stack.back() = discarded;
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||||
}
|
||||
else
|
||||
{
|
||||
ref_stack.back()->set_parents();
|
||||
}
|
||||
}
|
||||
|
||||
JSON_ASSERT(!ref_stack.empty());
|
||||
JSON_ASSERT(!keep_stack.empty());
|
||||
ref_stack.pop_back();
|
||||
keep_stack.pop_back();
|
||||
|
||||
if (!ref_stack.empty() && ref_stack.back() && ref_stack.back()->is_structured())
|
||||
{
|
||||
// remove discarded value
|
||||
for (auto it = ref_stack.back()->begin(); it != ref_stack.back()->end(); ++it)
|
||||
{
|
||||
if (it->is_discarded())
|
||||
{
|
||||
ref_stack.back()->erase(it);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool start_array(std::size_t len)
|
||||
{
|
||||
const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::array_start, discarded);
|
||||
keep_stack.push_back(keep);
|
||||
|
||||
auto val = handle_value(BasicJsonType::value_t::array, true);
|
||||
ref_stack.push_back(val.second);
|
||||
|
||||
// check array limit
|
||||
if (ref_stack.back() && JSON_HEDLEY_UNLIKELY(len != static_cast<std::size_t>(-1) && len > ref_stack.back()->max_size()))
|
||||
{
|
||||
JSON_THROW(out_of_range::create(408, concat("excessive array size: ", std::to_string(len)), ref_stack.back()));
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool end_array()
|
||||
{
|
||||
bool keep = true;
|
||||
|
||||
if (ref_stack.back())
|
||||
{
|
||||
keep = callback(static_cast<int>(ref_stack.size()) - 1, parse_event_t::array_end, *ref_stack.back());
|
||||
if (keep)
|
||||
{
|
||||
ref_stack.back()->set_parents();
|
||||
}
|
||||
else
|
||||
{
|
||||
// discard array
|
||||
*ref_stack.back() = discarded;
|
||||
}
|
||||
}
|
||||
|
||||
JSON_ASSERT(!ref_stack.empty());
|
||||
JSON_ASSERT(!keep_stack.empty());
|
||||
ref_stack.pop_back();
|
||||
keep_stack.pop_back();
|
||||
|
||||
// remove discarded value
|
||||
if (!keep && !ref_stack.empty() && ref_stack.back()->is_array())
|
||||
{
|
||||
ref_stack.back()->m_data.m_value.array->pop_back();
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
template<class Exception>
|
||||
bool parse_error(std::size_t /*unused*/, const std::string& /*unused*/,
|
||||
const Exception& ex)
|
||||
{
|
||||
errored = true;
|
||||
static_cast<void>(ex);
|
||||
if (allow_exceptions)
|
||||
{
|
||||
JSON_THROW(ex);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
constexpr bool is_errored() const
|
||||
{
|
||||
return errored;
|
||||
}
|
||||
|
||||
private:
|
||||
/*!
|
||||
@param[in] v value to add to the JSON value we build during parsing
|
||||
@param[in] skip_callback whether we should skip calling the callback
|
||||
function; this is required after start_array() and
|
||||
start_object() SAX events, because otherwise we would call the
|
||||
callback function with an empty array or object, respectively.
|
||||
|
||||
@invariant If the ref stack is empty, then the passed value will be the new
|
||||
root.
|
||||
@invariant If the ref stack contains a value, then it is an array or an
|
||||
object to which we can add elements
|
||||
|
||||
@return pair of boolean (whether value should be kept) and pointer (to the
|
||||
passed value in the ref_stack hierarchy; nullptr if not kept)
|
||||
*/
|
||||
template<typename Value>
|
||||
std::pair<bool, BasicJsonType*> handle_value(Value&& v, const bool skip_callback = false)
|
||||
{
|
||||
JSON_ASSERT(!keep_stack.empty());
|
||||
|
||||
// do not handle this value if we know it would be added to a discarded
|
||||
// container
|
||||
if (!keep_stack.back())
|
||||
{
|
||||
return {false, nullptr};
|
||||
}
|
||||
|
||||
// create value
|
||||
auto value = BasicJsonType(std::forward<Value>(v));
|
||||
|
||||
// check callback
|
||||
const bool keep = skip_callback || callback(static_cast<int>(ref_stack.size()), parse_event_t::value, value);
|
||||
|
||||
// do not handle this value if we just learnt it shall be discarded
|
||||
if (!keep)
|
||||
{
|
||||
return {false, nullptr};
|
||||
}
|
||||
|
||||
if (ref_stack.empty())
|
||||
{
|
||||
root = std::move(value);
|
||||
return {true, &root};
|
||||
}
|
||||
|
||||
// skip this value if we already decided to skip the parent
|
||||
// (https://github.com/nlohmann/json/issues/971#issuecomment-413678360)
|
||||
if (!ref_stack.back())
|
||||
{
|
||||
return {false, nullptr};
|
||||
}
|
||||
|
||||
// we now only expect arrays and objects
|
||||
JSON_ASSERT(ref_stack.back()->is_array() || ref_stack.back()->is_object());
|
||||
|
||||
// array
|
||||
if (ref_stack.back()->is_array())
|
||||
{
|
||||
ref_stack.back()->m_data.m_value.array->emplace_back(std::move(value));
|
||||
return {true, &(ref_stack.back()->m_data.m_value.array->back())};
|
||||
}
|
||||
|
||||
// object
|
||||
JSON_ASSERT(ref_stack.back()->is_object());
|
||||
// check if we should store an element for the current key
|
||||
JSON_ASSERT(!key_keep_stack.empty());
|
||||
const bool store_element = key_keep_stack.back();
|
||||
key_keep_stack.pop_back();
|
||||
|
||||
if (!store_element)
|
||||
{
|
||||
return {false, nullptr};
|
||||
}
|
||||
|
||||
JSON_ASSERT(object_element);
|
||||
*object_element = std::move(value);
|
||||
return {true, object_element};
|
||||
}
|
||||
|
||||
/// the parsed JSON value
|
||||
BasicJsonType& root;
|
||||
/// stack to model hierarchy of values
|
||||
std::vector<BasicJsonType*> ref_stack {};
|
||||
/// stack to manage which values to keep
|
||||
std::vector<bool> keep_stack {};
|
||||
/// stack to manage which object keys to keep
|
||||
std::vector<bool> key_keep_stack {};
|
||||
/// helper to hold the reference for the next object element
|
||||
BasicJsonType* object_element = nullptr;
|
||||
/// whether a syntax error occurred
|
||||
bool errored = false;
|
||||
/// callback function
|
||||
const parser_callback_t callback = nullptr;
|
||||
/// whether to throw exceptions in case of errors
|
||||
const bool allow_exceptions = true;
|
||||
/// a discarded value for the callback
|
||||
BasicJsonType discarded = BasicJsonType::value_t::discarded;
|
||||
};
|
||||
|
||||
template<typename BasicJsonType>
|
||||
class json_sax_acceptor
|
||||
{
|
||||
public:
|
||||
using number_integer_t = typename BasicJsonType::number_integer_t;
|
||||
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
|
||||
using number_float_t = typename BasicJsonType::number_float_t;
|
||||
using string_t = typename BasicJsonType::string_t;
|
||||
using binary_t = typename BasicJsonType::binary_t;
|
||||
|
||||
bool null()
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool boolean(bool /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool number_integer(number_integer_t /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool number_unsigned(number_unsigned_t /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool number_float(number_float_t /*unused*/, const string_t& /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool string(string_t& /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool binary(binary_t& /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool start_object(std::size_t /*unused*/ = static_cast<std::size_t>(-1))
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool key(string_t& /*unused*/)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool end_object()
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool start_array(std::size_t /*unused*/ = static_cast<std::size_t>(-1))
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool end_array()
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool parse_error(std::size_t /*unused*/, const std::string& /*unused*/, const detail::exception& /*unused*/)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
} // namespace detail
|
||||
NLOHMANN_JSON_NAMESPACE_END
|
||||
Reference in New Issue
Block a user