329 lines
13 KiB
C++
329 lines
13 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 <cstdint> // size_t
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#include <utility> // declval
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#include <string> // string
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#include <nlohmann/detail/abi_macros.hpp>
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#include <nlohmann/detail/meta/detected.hpp>
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#include <nlohmann/detail/meta/type_traits.hpp>
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NLOHMANN_JSON_NAMESPACE_BEGIN
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namespace detail
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{
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// helper struct to call sax->next_token_start
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//(we want this functionality as a type to ease passing it as template argument)
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struct sax_call_next_token_start_pos_direct
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{
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template<typename SAX, typename...Ts>
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static auto call(SAX* sax, Ts&& ...ts)
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-> decltype(sax->next_token_start(std::forward<Ts>(ts)...))
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{
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sax->next_token_start(std::forward<Ts>(ts)...);
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}
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};
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// helper struct to call sax->next_token_end
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// (we want this functionality as a type to ease passing it as template argument)
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struct sax_call_next_token_end_pos_direct
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{
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template<typename SAX, typename...Ts>
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static auto call(SAX* sax, Ts&& ...ts)
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-> decltype(sax->next_token_end(std::forward<Ts>(ts)...))
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{
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sax->next_token_end(std::forward<Ts>(ts)...);
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}
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};
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// dispatch the calls to next_token_start next_token_end
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// and drop the calls if the sax parser does not support these methods.
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//
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// DirectCaller can be set to one of sax_call_next_token_{start,end}_pos_direct to
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// determine which method is called
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template <typename DirectCaller, typename SAX, typename LexOrPos>
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struct sax_call_function
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{
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// is the parameter a lexer or a byte position
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static constexpr bool called_with_byte_pos = std::is_same<LexOrPos, std::size_t>::value;
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template<typename SAX2, typename...Ts2>
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using call_t = decltype(DirectCaller::call(std::declval<SAX2*>(), std::declval<Ts2>()...));
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//the sax parser supports calls with a position
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static constexpr bool detected_call_with_byte_pos =
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is_detected_exact<void, call_t, SAX, std::size_t>::value;
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//the sax parser supports calls with a lexer
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static constexpr bool detected_call_with_lex_pos =
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!called_with_byte_pos &&
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is_detected_exact<void, call_t, SAX, const position_t >::value;
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//there either has to be a version accepting a lexer or a position
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static constexpr bool valid = detected_call_with_byte_pos || detected_call_with_lex_pos;
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//called with byte pos and byte pos is method supported -> pass data on
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template<typename SaxT = SAX>
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static typename std::enable_if <
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std::is_same<SaxT, SAX>::value &&
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valid &&
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detected_call_with_byte_pos
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>::type
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call(SaxT* sax, std::size_t pos)
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{
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DirectCaller::call(sax, pos);
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}
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//the sax parser has no version of the method -> drop call
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template<typename SaxT = SAX>
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static typename std::enable_if <
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std::is_same<SaxT, SAX>::value &&
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!valid
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>::type
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call(SaxT* /*unused*/, const LexOrPos& /*unused*/) {}
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//called with lex and lex pos method is supported -> call with position from lexer
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// the start pos in the lexer is last read char -> chars_read_total-1
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template<typename SaxT = SAX>
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static typename std::enable_if <
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std::is_same<SaxT, SAX>::value &&
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valid &&
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!called_with_byte_pos &&
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detected_call_with_lex_pos &&
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std::is_same<DirectCaller, sax_call_next_token_start_pos_direct>::value
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>::type
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call(SaxT* sax, const LexOrPos& lex)
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{
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JSON_ASSERT(lex.get_position().chars_read_total > 0);
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JSON_ASSERT(lex.get_position().chars_read_current_line > 0);
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//the lexer has already read the first char of the current element -> fix this
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auto pos_copy = lex.get_position();
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--pos_copy.chars_read_total;
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--pos_copy.chars_read_current_line;
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DirectCaller::call(sax, pos_copy);
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}
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//called with lex and lex pos method is supported -> pass data on
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// the one past end pos in the lexer is the current index -> chars_read_total
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template<typename SaxT = SAX>
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static typename std::enable_if <
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std::is_same<SaxT, SAX>::value &&
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valid &&
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!called_with_byte_pos &&
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detected_call_with_lex_pos &&
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std::is_same<DirectCaller, sax_call_next_token_end_pos_direct>::value
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>::type
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call(SaxT* sax, const LexOrPos& lex)
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{
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DirectCaller::call(sax, lex.get_position());
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}
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// called with lex and only byte pos method is supported -> call with byte position from lexer
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// the start pos in the lexer is last read char -> chars_read_total-1
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template<typename SaxT = SAX>
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static typename std::enable_if <
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std::is_same<SaxT, SAX>::value &&
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valid &&
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!called_with_byte_pos &&
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!detected_call_with_lex_pos &&
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std::is_same<DirectCaller, sax_call_next_token_start_pos_direct>::value
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>::type
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call(SaxT* sax, const LexOrPos& lex)
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{
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JSON_ASSERT(lex.get_position().chars_read_total > 0);
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DirectCaller::call(sax, lex.get_position().chars_read_total - 1);
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}
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// called with lex and only byte pos method is supported -> call with byte position from lexer
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// the one past end pos in the lexer is the current index -> chars_read_total
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template<typename SaxT = SAX>
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static typename std::enable_if <
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std::is_same<SaxT, SAX>::value &&
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valid &&
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!called_with_byte_pos &&
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!detected_call_with_lex_pos &&
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std::is_same<DirectCaller, sax_call_next_token_end_pos_direct>::value
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>::type
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call(SaxT* sax, const LexOrPos& lex)
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{
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DirectCaller::call(sax, lex.get_position().chars_read_total);
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}
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};
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//set the element start pos of a sax parser by calling any version of sax->next_token_start (if available)
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template<class SAX, class LexOrPos>
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void sax_call_next_token_start_pos(SAX* sax, const LexOrPos& lexOrPos)
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{
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using call_t = sax_call_function<sax_call_next_token_start_pos_direct, SAX, LexOrPos>;
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call_t::call(sax, lexOrPos);
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}
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//set the element end pos of a sax parser by calling any version of sax->next_token_end (if available)
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template<class SAX, class LexOrPos>
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void sax_call_next_token_end_pos(SAX* sax, const LexOrPos& lexOrPos)
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{
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using call_t = sax_call_function<sax_call_next_token_end_pos_direct, SAX, LexOrPos>;
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call_t::call(sax, lexOrPos);
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}
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//set the element start end pos of a sax parser by calling any version of
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// sax->next_token_start and sax->next_token_end (if available)
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template<class SAX, class LexOrPos1, class LexOrPos2>
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void sax_call_next_token_start_end_pos(SAX* sax, const LexOrPos1& lexOrPos1, const LexOrPos2& lexOrPos2)
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{
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sax_call_next_token_start_pos(sax, lexOrPos1);
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sax_call_next_token_end_pos(sax, lexOrPos2);
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}
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//set the element start end pos of a sax parser by calling any version of
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// sax->next_token_start and sax->next_token_end (if available)
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template<class SAX, class LexOrPos>
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void sax_call_next_token_start_end_pos(SAX* sax, const LexOrPos& lexOrPos)
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{
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sax_call_next_token_start_pos(sax, lexOrPos);
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sax_call_next_token_end_pos(sax, lexOrPos);
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}
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template<typename T>
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using null_function_t = decltype(std::declval<T&>().null());
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template<typename T>
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using boolean_function_t =
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decltype(std::declval<T&>().boolean(std::declval<bool>()));
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template<typename T, typename Integer>
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using number_integer_function_t =
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decltype(std::declval<T&>().number_integer(std::declval<Integer>()));
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template<typename T, typename Unsigned>
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using number_unsigned_function_t =
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decltype(std::declval<T&>().number_unsigned(std::declval<Unsigned>()));
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template<typename T, typename Float, typename String>
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using number_float_function_t = decltype(std::declval<T&>().number_float(
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std::declval<Float>(), std::declval<const String&>()));
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template<typename T, typename String>
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using string_function_t =
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decltype(std::declval<T&>().string(std::declval<String&>()));
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template<typename T, typename Binary>
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using binary_function_t =
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decltype(std::declval<T&>().binary(std::declval<Binary&>()));
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template<typename T>
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using start_object_function_t =
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decltype(std::declval<T&>().start_object(std::declval<std::size_t>()));
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template<typename T, typename String>
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using key_function_t =
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decltype(std::declval<T&>().key(std::declval<String&>()));
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template<typename T>
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using end_object_function_t = decltype(std::declval<T&>().end_object());
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template<typename T>
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using start_array_function_t =
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decltype(std::declval<T&>().start_array(std::declval<std::size_t>()));
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template<typename T>
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using end_array_function_t = decltype(std::declval<T&>().end_array());
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template<typename T, typename Exception>
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using parse_error_function_t = decltype(std::declval<T&>().parse_error(
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std::declval<std::size_t>(), std::declval<const std::string&>(),
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std::declval<const Exception&>()));
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template<typename SAX, typename BasicJsonType>
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struct is_sax
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{
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private:
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static_assert(is_basic_json<BasicJsonType>::value,
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"BasicJsonType must be of type basic_json<...>");
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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 exception_t = typename BasicJsonType::exception;
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public:
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static constexpr bool value =
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is_detected_exact<bool, null_function_t, SAX>::value &&
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is_detected_exact<bool, boolean_function_t, SAX>::value &&
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is_detected_exact<bool, number_integer_function_t, SAX, number_integer_t>::value &&
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is_detected_exact<bool, number_unsigned_function_t, SAX, number_unsigned_t>::value &&
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is_detected_exact<bool, number_float_function_t, SAX, number_float_t, string_t>::value &&
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is_detected_exact<bool, string_function_t, SAX, string_t>::value &&
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is_detected_exact<bool, binary_function_t, SAX, binary_t>::value &&
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is_detected_exact<bool, start_object_function_t, SAX>::value &&
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is_detected_exact<bool, key_function_t, SAX, string_t>::value &&
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is_detected_exact<bool, end_object_function_t, SAX>::value &&
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is_detected_exact<bool, start_array_function_t, SAX>::value &&
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is_detected_exact<bool, end_array_function_t, SAX>::value &&
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is_detected_exact<bool, parse_error_function_t, SAX, exception_t>::value;
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};
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template<typename SAX, typename BasicJsonType>
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struct is_sax_static_asserts
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{
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private:
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static_assert(is_basic_json<BasicJsonType>::value,
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"BasicJsonType must be of type basic_json<...>");
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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 exception_t = typename BasicJsonType::exception;
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public:
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static_assert(is_detected_exact<bool, null_function_t, SAX>::value,
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"Missing/invalid function: bool null()");
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static_assert(is_detected_exact<bool, boolean_function_t, SAX>::value,
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"Missing/invalid function: bool boolean(bool)");
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static_assert(is_detected_exact<bool, boolean_function_t, SAX>::value,
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"Missing/invalid function: bool boolean(bool)");
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static_assert(
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is_detected_exact<bool, number_integer_function_t, SAX,
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number_integer_t>::value,
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"Missing/invalid function: bool number_integer(number_integer_t)");
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static_assert(
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is_detected_exact<bool, number_unsigned_function_t, SAX,
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number_unsigned_t>::value,
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"Missing/invalid function: bool number_unsigned(number_unsigned_t)");
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static_assert(is_detected_exact<bool, number_float_function_t, SAX,
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number_float_t, string_t>::value,
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"Missing/invalid function: bool number_float(number_float_t, const string_t&)");
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static_assert(
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is_detected_exact<bool, string_function_t, SAX, string_t>::value,
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"Missing/invalid function: bool string(string_t&)");
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static_assert(
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is_detected_exact<bool, binary_function_t, SAX, binary_t>::value,
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"Missing/invalid function: bool binary(binary_t&)");
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static_assert(is_detected_exact<bool, start_object_function_t, SAX>::value,
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"Missing/invalid function: bool start_object(std::size_t)");
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static_assert(is_detected_exact<bool, key_function_t, SAX, string_t>::value,
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"Missing/invalid function: bool key(string_t&)");
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static_assert(is_detected_exact<bool, end_object_function_t, SAX>::value,
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"Missing/invalid function: bool end_object()");
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static_assert(is_detected_exact<bool, start_array_function_t, SAX>::value,
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"Missing/invalid function: bool start_array(std::size_t)");
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static_assert(is_detected_exact<bool, end_array_function_t, SAX>::value,
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"Missing/invalid function: bool end_array()");
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static_assert(
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is_detected_exact<bool, parse_error_function_t, SAX, exception_t>::value,
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"Missing/invalid function: bool parse_error(std::size_t, const "
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"std::string&, const exception&)");
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};
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} // namespace detail
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NLOHMANN_JSON_NAMESPACE_END
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