729 lines
21 KiB
C++
729 lines
21 KiB
C++
// __ _____ _____ _____
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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_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_value.array->emplace_back(std::forward<Value>(v));
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return &(ref_stack.back()->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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}
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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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// 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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{
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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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BasicJsonType k = BasicJsonType(val);
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// 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
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if (keep && ref_stack.back())
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{
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object_element = &(ref_stack.back()->m_value.object->operator[](val) = discarded);
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}
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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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if (ref_stack.back())
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{
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if (!callback(static_cast<int>(ref_stack.size()) - 1, parse_event_t::object_end, *ref_stack.back()))
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{
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// discard object
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*ref_stack.back() = discarded;
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}
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else
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{
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ref_stack.back()->set_parents();
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}
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}
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JSON_ASSERT(!ref_stack.empty());
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JSON_ASSERT(!keep_stack.empty());
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ref_stack.pop_back();
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keep_stack.pop_back();
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if (!ref_stack.empty() && ref_stack.back() && ref_stack.back()->is_structured())
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{
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// remove discarded value
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for (auto it = ref_stack.back()->begin(); it != ref_stack.back()->end(); ++it)
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{
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if (it->is_discarded())
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{
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ref_stack.back()->erase(it);
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break;
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}
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}
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}
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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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const bool keep = callback(static_cast<int>(ref_stack.size()), parse_event_t::array_start, discarded);
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keep_stack.push_back(keep);
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auto val = handle_value(BasicJsonType::value_t::array, true);
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ref_stack.push_back(val.second);
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// check array 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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{
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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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bool keep = true;
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if (ref_stack.back())
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{
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keep = callback(static_cast<int>(ref_stack.size()) - 1, parse_event_t::array_end, *ref_stack.back());
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if (keep)
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{
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ref_stack.back()->set_parents();
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}
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else
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{
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// discard array
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*ref_stack.back() = discarded;
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}
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}
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JSON_ASSERT(!ref_stack.empty());
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JSON_ASSERT(!keep_stack.empty());
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ref_stack.pop_back();
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keep_stack.pop_back();
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// remove discarded value
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if (!keep && !ref_stack.empty() && ref_stack.back()->is_array())
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{
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ref_stack.back()->m_value.array->pop_back();
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}
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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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@param[in] v value to add to the JSON value we build during parsing
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@param[in] skip_callback whether we should skip calling the callback
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function; this is required after start_array() and
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start_object() SAX events, because otherwise we would call the
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callback function with an empty array or object, respectively.
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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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@return pair of boolean (whether value should be kept) and pointer (to the
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passed value in the ref_stack hierarchy; nullptr if not kept)
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*/
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template<typename Value>
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std::pair<bool, BasicJsonType*> handle_value(Value&& v, const bool skip_callback = false)
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{
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JSON_ASSERT(!keep_stack.empty());
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// do not handle this value if we know it would be added to a discarded
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// container
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if (!keep_stack.back())
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{
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return {false, nullptr};
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}
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// create value
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auto value = BasicJsonType(std::forward<Value>(v));
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// check callback
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const bool keep = skip_callback || callback(static_cast<int>(ref_stack.size()), parse_event_t::value, value);
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// do not handle this value if we just learnt it shall be discarded
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if (!keep)
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{
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return {false, nullptr};
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}
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if (ref_stack.empty())
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{
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root = std::move(value);
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return {true, &root};
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}
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// skip this value if we already decided to skip the parent
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// (https://github.com/nlohmann/json/issues/971#issuecomment-413678360)
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if (!ref_stack.back())
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{
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return {false, nullptr};
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}
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// we now only expect arrays and objects
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JSON_ASSERT(ref_stack.back()->is_array() || ref_stack.back()->is_object());
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// array
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if (ref_stack.back()->is_array())
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{
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ref_stack.back()->m_value.array->emplace_back(std::move(value));
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return {true, &(ref_stack.back()->m_value.array->back())};
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}
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// object
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JSON_ASSERT(ref_stack.back()->is_object());
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// check if we should store an element for the current key
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JSON_ASSERT(!key_keep_stack.empty());
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const bool store_element = key_keep_stack.back();
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key_keep_stack.pop_back();
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if (!store_element)
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{
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return {false, nullptr};
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}
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JSON_ASSERT(object_element);
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*object_element = std::move(value);
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return {true, 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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/// stack to manage which values to keep
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std::vector<bool> keep_stack {};
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/// stack to manage which object keys to keep
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std::vector<bool> key_keep_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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/// callback function
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const parser_callback_t callback = nullptr;
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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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/// a discarded value for the callback
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BasicJsonType discarded = BasicJsonType::value_t::discarded;
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};
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template<typename BasicJsonType>
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class json_sax_acceptor
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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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bool null()
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{
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return true;
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}
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bool boolean(bool /*unused*/)
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{
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return true;
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}
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bool number_integer(number_integer_t /*unused*/)
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{
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return true;
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}
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bool number_unsigned(number_unsigned_t /*unused*/)
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{
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return true;
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}
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bool number_float(number_float_t /*unused*/, const string_t& /*unused*/)
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{
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return true;
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}
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bool string(string_t& /*unused*/)
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{
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return true;
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}
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bool binary(binary_t& /*unused*/)
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{
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return true;
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}
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bool start_object(std::size_t /*unused*/ = static_cast<std::size_t>(-1))
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{
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return true;
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}
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bool key(string_t& /*unused*/)
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{
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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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return true;
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}
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bool start_array(std::size_t /*unused*/ = static_cast<std::size_t>(-1))
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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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return true;
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}
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bool parse_error(std::size_t /*unused*/, const std::string& /*unused*/, const detail::exception& /*unused*/)
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{
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return false;
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}
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};
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} // namespace detail
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NLOHMANN_JSON_NAMESPACE_END
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