989 lines
39 KiB
C++
989 lines
39 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: 2008-2009 Björn Hoehrmann <bjoern@hoehrmann.de>
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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 <algorithm> // reverse, remove, fill, find, none_of
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#include <array> // array
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#include <clocale> // localeconv, lconv
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#include <cmath> // labs, isfinite, isnan, signbit
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#include <cstddef> // size_t, ptrdiff_t
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#include <cstdint> // uint8_t
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#include <cstdio> // snprintf
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#include <limits> // numeric_limits
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#include <string> // string, char_traits
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#include <iomanip> // setfill, setw
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#include <type_traits> // is_same
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#include <utility> // move
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#include <nlohmann/detail/conversions/to_chars.hpp>
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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/meta/cpp_future.hpp>
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#include <nlohmann/detail/output/binary_writer.hpp>
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#include <nlohmann/detail/output/output_adapters.hpp>
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#include <nlohmann/detail/string_concat.hpp>
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#include <nlohmann/detail/value_t.hpp>
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NLOHMANN_JSON_NAMESPACE_BEGIN
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namespace detail
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{
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///////////////////
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// serialization //
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///////////////////
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/// how to treat decoding errors
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enum class error_handler_t
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{
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strict, ///< throw a type_error exception in case of invalid UTF-8
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replace, ///< replace invalid UTF-8 sequences with U+FFFD
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ignore ///< ignore invalid UTF-8 sequences
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};
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template<typename BasicJsonType>
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class serializer
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{
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using string_t = typename BasicJsonType::string_t;
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using number_float_t = typename BasicJsonType::number_float_t;
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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 binary_char_t = typename BasicJsonType::binary_t::value_type;
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static constexpr std::uint8_t UTF8_ACCEPT = 0;
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static constexpr std::uint8_t UTF8_REJECT = 1;
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public:
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/*!
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@param[in] s output stream to serialize to
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@param[in] ichar indentation character to use
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@param[in] error_handler_ how to react on decoding errors
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*/
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serializer(output_adapter_t<char> s, const char ichar,
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error_handler_t error_handler_ = error_handler_t::strict)
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: o(std::move(s))
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, loc(std::localeconv())
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, thousands_sep(loc->thousands_sep == nullptr ? '\0' : std::char_traits<char>::to_char_type(* (loc->thousands_sep)))
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, decimal_point(loc->decimal_point == nullptr ? '\0' : std::char_traits<char>::to_char_type(* (loc->decimal_point)))
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, indent_char(ichar)
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, indent_string(512, indent_char)
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, error_handler(error_handler_)
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{}
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// delete because of pointer members
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serializer(const serializer&) = delete;
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serializer& operator=(const serializer&) = delete;
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serializer(serializer&&) = delete;
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serializer& operator=(serializer&&) = delete;
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~serializer() = default;
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/*!
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@brief internal implementation of the serialization function
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This function is called by the public member function dump and organizes
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the serialization internally. The indentation level is propagated as
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additional parameter. In case of arrays and objects, the function is
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called recursively.
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- strings and object keys are escaped using `escape_string()`
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- integer numbers are converted implicitly via `operator<<`
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- floating-point numbers are converted to a string using `"%g"` format
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- binary values are serialized as objects containing the subtype and the
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byte array
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@param[in] val value to serialize
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@param[in] pretty_print whether the output shall be pretty-printed
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@param[in] ensure_ascii If @a ensure_ascii is true, all non-ASCII characters
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in the output are escaped with `\uXXXX` sequences, and the result consists
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of ASCII characters only.
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@param[in] indent_step the indent level
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@param[in] current_indent the current indent level (only used internally)
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*/
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void dump(const BasicJsonType& val,
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const bool pretty_print,
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const bool ensure_ascii,
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const unsigned int indent_step,
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const unsigned int current_indent = 0)
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{
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switch (val.m_type)
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{
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case value_t::object:
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{
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if (val.m_value.object->empty())
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{
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o->write_characters("{}", 2);
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return;
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}
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if (pretty_print)
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{
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o->write_characters("{\n", 2);
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// variable to hold indentation for recursive calls
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const auto new_indent = current_indent + indent_step;
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if (JSON_HEDLEY_UNLIKELY(indent_string.size() < new_indent))
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{
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indent_string.resize(indent_string.size() * 2, ' ');
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}
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// first n-1 elements
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auto i = val.m_value.object->cbegin();
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for (std::size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
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{
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o->write_characters(indent_string.c_str(), new_indent);
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o->write_character('\"');
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dump_escaped(i->first, ensure_ascii);
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o->write_characters("\": ", 3);
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dump(i->second, true, ensure_ascii, indent_step, new_indent);
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o->write_characters(",\n", 2);
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}
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// last element
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JSON_ASSERT(i != val.m_value.object->cend());
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JSON_ASSERT(std::next(i) == val.m_value.object->cend());
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o->write_characters(indent_string.c_str(), new_indent);
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o->write_character('\"');
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dump_escaped(i->first, ensure_ascii);
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o->write_characters("\": ", 3);
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dump(i->second, true, ensure_ascii, indent_step, new_indent);
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o->write_character('\n');
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o->write_characters(indent_string.c_str(), current_indent);
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o->write_character('}');
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}
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else
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{
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o->write_character('{');
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// first n-1 elements
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auto i = val.m_value.object->cbegin();
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for (std::size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
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{
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o->write_character('\"');
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dump_escaped(i->first, ensure_ascii);
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o->write_characters("\":", 2);
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dump(i->second, false, ensure_ascii, indent_step, current_indent);
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o->write_character(',');
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}
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// last element
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JSON_ASSERT(i != val.m_value.object->cend());
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JSON_ASSERT(std::next(i) == val.m_value.object->cend());
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o->write_character('\"');
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dump_escaped(i->first, ensure_ascii);
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o->write_characters("\":", 2);
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dump(i->second, false, ensure_ascii, indent_step, current_indent);
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o->write_character('}');
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}
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return;
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}
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case value_t::array:
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{
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if (val.m_value.array->empty())
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{
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o->write_characters("[]", 2);
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return;
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}
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if (pretty_print)
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{
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o->write_characters("[\n", 2);
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// variable to hold indentation for recursive calls
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const auto new_indent = current_indent + indent_step;
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if (JSON_HEDLEY_UNLIKELY(indent_string.size() < new_indent))
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{
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indent_string.resize(indent_string.size() * 2, ' ');
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}
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// first n-1 elements
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for (auto i = val.m_value.array->cbegin();
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i != val.m_value.array->cend() - 1; ++i)
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{
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o->write_characters(indent_string.c_str(), new_indent);
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dump(*i, true, ensure_ascii, indent_step, new_indent);
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o->write_characters(",\n", 2);
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}
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// last element
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JSON_ASSERT(!val.m_value.array->empty());
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o->write_characters(indent_string.c_str(), new_indent);
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dump(val.m_value.array->back(), true, ensure_ascii, indent_step, new_indent);
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o->write_character('\n');
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o->write_characters(indent_string.c_str(), current_indent);
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o->write_character(']');
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}
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else
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{
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o->write_character('[');
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// first n-1 elements
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for (auto i = val.m_value.array->cbegin();
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i != val.m_value.array->cend() - 1; ++i)
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{
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dump(*i, false, ensure_ascii, indent_step, current_indent);
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o->write_character(',');
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}
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// last element
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JSON_ASSERT(!val.m_value.array->empty());
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dump(val.m_value.array->back(), false, ensure_ascii, indent_step, current_indent);
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o->write_character(']');
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}
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return;
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}
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case value_t::string:
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{
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o->write_character('\"');
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dump_escaped(*val.m_value.string, ensure_ascii);
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o->write_character('\"');
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return;
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}
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case value_t::binary:
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{
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if (pretty_print)
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{
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o->write_characters("{\n", 2);
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// variable to hold indentation for recursive calls
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const auto new_indent = current_indent + indent_step;
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if (JSON_HEDLEY_UNLIKELY(indent_string.size() < new_indent))
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{
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indent_string.resize(indent_string.size() * 2, ' ');
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}
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o->write_characters(indent_string.c_str(), new_indent);
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o->write_characters("\"bytes\": [", 10);
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if (!val.m_value.binary->empty())
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{
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for (auto i = val.m_value.binary->cbegin();
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i != val.m_value.binary->cend() - 1; ++i)
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{
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dump_integer(*i);
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o->write_characters(", ", 2);
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}
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dump_integer(val.m_value.binary->back());
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}
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o->write_characters("],\n", 3);
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o->write_characters(indent_string.c_str(), new_indent);
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o->write_characters("\"subtype\": ", 11);
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if (val.m_value.binary->has_subtype())
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{
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dump_integer(val.m_value.binary->subtype());
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}
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else
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{
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o->write_characters("null", 4);
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}
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o->write_character('\n');
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o->write_characters(indent_string.c_str(), current_indent);
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o->write_character('}');
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}
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else
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{
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o->write_characters("{\"bytes\":[", 10);
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if (!val.m_value.binary->empty())
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{
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for (auto i = val.m_value.binary->cbegin();
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i != val.m_value.binary->cend() - 1; ++i)
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{
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dump_integer(*i);
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o->write_character(',');
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}
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dump_integer(val.m_value.binary->back());
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}
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o->write_characters("],\"subtype\":", 12);
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if (val.m_value.binary->has_subtype())
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{
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dump_integer(val.m_value.binary->subtype());
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o->write_character('}');
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}
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else
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{
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o->write_characters("null}", 5);
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}
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}
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return;
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}
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case value_t::boolean:
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{
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if (val.m_value.boolean)
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{
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o->write_characters("true", 4);
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}
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else
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{
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o->write_characters("false", 5);
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}
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return;
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}
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case value_t::number_integer:
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{
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dump_integer(val.m_value.number_integer);
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return;
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}
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case value_t::number_unsigned:
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{
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dump_integer(val.m_value.number_unsigned);
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return;
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}
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case value_t::number_float:
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{
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dump_float(val.m_value.number_float);
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return;
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}
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case value_t::discarded:
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{
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o->write_characters("<discarded>", 11);
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return;
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}
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case value_t::null:
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{
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o->write_characters("null", 4);
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return;
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}
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default: // LCOV_EXCL_LINE
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JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
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}
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}
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JSON_PRIVATE_UNLESS_TESTED:
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/*!
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@brief dump escaped string
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Escape a string by replacing certain special characters by a sequence of an
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escape character (backslash) and another character and other control
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characters by a sequence of "\u" followed by a four-digit hex
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representation. The escaped string is written to output stream @a o.
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@param[in] s the string to escape
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@param[in] ensure_ascii whether to escape non-ASCII characters with
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\uXXXX sequences
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@complexity Linear in the length of string @a s.
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*/
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void dump_escaped(const string_t& s, const bool ensure_ascii)
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{
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std::uint32_t codepoint{};
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std::uint8_t state = UTF8_ACCEPT;
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std::size_t bytes = 0; // number of bytes written to string_buffer
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// number of bytes written at the point of the last valid byte
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std::size_t bytes_after_last_accept = 0;
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std::size_t undumped_chars = 0;
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for (std::size_t i = 0; i < s.size(); ++i)
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{
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const auto byte = static_cast<std::uint8_t>(s[i]);
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switch (decode(state, codepoint, byte))
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{
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case UTF8_ACCEPT: // decode found a new code point
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{
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switch (codepoint)
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{
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case 0x08: // backspace
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = 'b';
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break;
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}
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case 0x09: // horizontal tab
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = 't';
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break;
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}
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case 0x0A: // newline
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = 'n';
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break;
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}
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case 0x0C: // formfeed
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = 'f';
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break;
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}
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case 0x0D: // carriage return
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = 'r';
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break;
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}
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case 0x22: // quotation mark
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = '\"';
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break;
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}
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case 0x5C: // reverse solidus
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = '\\';
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break;
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}
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default:
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{
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// escape control characters (0x00..0x1F) or, if
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// ensure_ascii parameter is used, non-ASCII characters
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if ((codepoint <= 0x1F) || (ensure_ascii && (codepoint >= 0x7F)))
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{
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if (codepoint <= 0xFFFF)
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{
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// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
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static_cast<void>((std::snprintf)(string_buffer.data() + bytes, 7, "\\u%04x",
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static_cast<std::uint16_t>(codepoint)));
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bytes += 6;
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}
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else
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{
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// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
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static_cast<void>((std::snprintf)(string_buffer.data() + bytes, 13, "\\u%04x\\u%04x",
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static_cast<std::uint16_t>(0xD7C0u + (codepoint >> 10u)),
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static_cast<std::uint16_t>(0xDC00u + (codepoint & 0x3FFu))));
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bytes += 12;
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}
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}
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else
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{
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// copy byte to buffer (all previous bytes
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// been copied have in default case above)
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string_buffer[bytes++] = s[i];
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}
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break;
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}
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}
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// write buffer and reset index; there must be 13 bytes
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// left, as this is the maximal number of bytes to be
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// written ("\uxxxx\uxxxx\0") for one code point
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if (string_buffer.size() - bytes < 13)
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{
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o->write_characters(string_buffer.data(), bytes);
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bytes = 0;
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}
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// remember the byte position of this accept
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bytes_after_last_accept = bytes;
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undumped_chars = 0;
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break;
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}
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case UTF8_REJECT: // decode found invalid UTF-8 byte
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{
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switch (error_handler)
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{
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case error_handler_t::strict:
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{
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JSON_THROW(type_error::create(316, concat("invalid UTF-8 byte at index ", std::to_string(i), ": 0x", hex_bytes(byte | 0)), nullptr));
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}
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case error_handler_t::ignore:
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case error_handler_t::replace:
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{
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// in case we saw this character the first time, we
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// would like to read it again, because the byte
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// may be OK for itself, but just not OK for the
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// previous sequence
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if (undumped_chars > 0)
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{
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--i;
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}
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|
|
// reset length buffer to the last accepted index;
|
|
// thus removing/ignoring the invalid characters
|
|
bytes = bytes_after_last_accept;
|
|
|
|
if (error_handler == error_handler_t::replace)
|
|
{
|
|
// add a replacement character
|
|
if (ensure_ascii)
|
|
{
|
|
string_buffer[bytes++] = '\\';
|
|
string_buffer[bytes++] = 'u';
|
|
string_buffer[bytes++] = 'f';
|
|
string_buffer[bytes++] = 'f';
|
|
string_buffer[bytes++] = 'f';
|
|
string_buffer[bytes++] = 'd';
|
|
}
|
|
else
|
|
{
|
|
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xEF');
|
|
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBF');
|
|
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBD');
|
|
}
|
|
|
|
// write buffer and reset index; there must be 13 bytes
|
|
// left, as this is the maximal number of bytes to be
|
|
// written ("\uxxxx\uxxxx\0") for one code point
|
|
if (string_buffer.size() - bytes < 13)
|
|
{
|
|
o->write_characters(string_buffer.data(), bytes);
|
|
bytes = 0;
|
|
}
|
|
|
|
bytes_after_last_accept = bytes;
|
|
}
|
|
|
|
undumped_chars = 0;
|
|
|
|
// continue processing the string
|
|
state = UTF8_ACCEPT;
|
|
break;
|
|
}
|
|
|
|
default: // LCOV_EXCL_LINE
|
|
JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
|
|
}
|
|
break;
|
|
}
|
|
|
|
default: // decode found yet incomplete multi-byte code point
|
|
{
|
|
if (!ensure_ascii)
|
|
{
|
|
// code point will not be escaped - copy byte to buffer
|
|
string_buffer[bytes++] = s[i];
|
|
}
|
|
++undumped_chars;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// we finished processing the string
|
|
if (JSON_HEDLEY_LIKELY(state == UTF8_ACCEPT))
|
|
{
|
|
// write buffer
|
|
if (bytes > 0)
|
|
{
|
|
o->write_characters(string_buffer.data(), bytes);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// we finish reading, but do not accept: string was incomplete
|
|
switch (error_handler)
|
|
{
|
|
case error_handler_t::strict:
|
|
{
|
|
JSON_THROW(type_error::create(316, concat("incomplete UTF-8 string; last byte: 0x", hex_bytes(static_cast<std::uint8_t>(s.back() | 0))), nullptr));
|
|
}
|
|
|
|
case error_handler_t::ignore:
|
|
{
|
|
// write all accepted bytes
|
|
o->write_characters(string_buffer.data(), bytes_after_last_accept);
|
|
break;
|
|
}
|
|
|
|
case error_handler_t::replace:
|
|
{
|
|
// write all accepted bytes
|
|
o->write_characters(string_buffer.data(), bytes_after_last_accept);
|
|
// add a replacement character
|
|
if (ensure_ascii)
|
|
{
|
|
o->write_characters("\\ufffd", 6);
|
|
}
|
|
else
|
|
{
|
|
o->write_characters("\xEF\xBF\xBD", 3);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default: // LCOV_EXCL_LINE
|
|
JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
|
|
}
|
|
}
|
|
}
|
|
|
|
private:
|
|
/*!
|
|
@brief count digits
|
|
|
|
Count the number of decimal (base 10) digits for an input unsigned integer.
|
|
|
|
@param[in] x unsigned integer number to count its digits
|
|
@return number of decimal digits
|
|
*/
|
|
inline unsigned int count_digits(number_unsigned_t x) noexcept
|
|
{
|
|
unsigned int n_digits = 1;
|
|
for (;;)
|
|
{
|
|
if (x < 10)
|
|
{
|
|
return n_digits;
|
|
}
|
|
if (x < 100)
|
|
{
|
|
return n_digits + 1;
|
|
}
|
|
if (x < 1000)
|
|
{
|
|
return n_digits + 2;
|
|
}
|
|
if (x < 10000)
|
|
{
|
|
return n_digits + 3;
|
|
}
|
|
x = x / 10000u;
|
|
n_digits += 4;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* @brief convert a byte to a uppercase hex representation
|
|
* @param[in] byte byte to represent
|
|
* @return representation ("00".."FF")
|
|
*/
|
|
static std::string hex_bytes(std::uint8_t byte)
|
|
{
|
|
std::string result = "FF";
|
|
constexpr const char* nibble_to_hex = "0123456789ABCDEF";
|
|
result[0] = nibble_to_hex[byte / 16];
|
|
result[1] = nibble_to_hex[byte % 16];
|
|
return result;
|
|
}
|
|
|
|
// templates to avoid warnings about useless casts
|
|
template <typename NumberType, enable_if_t<std::is_signed<NumberType>::value, int> = 0>
|
|
bool is_negative_number(NumberType x)
|
|
{
|
|
return x < 0;
|
|
}
|
|
|
|
template < typename NumberType, enable_if_t <std::is_unsigned<NumberType>::value, int > = 0 >
|
|
bool is_negative_number(NumberType /*unused*/)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/*!
|
|
@brief dump an integer
|
|
|
|
Dump a given integer to output stream @a o. Works internally with
|
|
@a number_buffer.
|
|
|
|
@param[in] x integer number (signed or unsigned) to dump
|
|
@tparam NumberType either @a number_integer_t or @a number_unsigned_t
|
|
*/
|
|
template < typename NumberType, detail::enable_if_t <
|
|
std::is_integral<NumberType>::value ||
|
|
std::is_same<NumberType, number_unsigned_t>::value ||
|
|
std::is_same<NumberType, number_integer_t>::value ||
|
|
std::is_same<NumberType, binary_char_t>::value,
|
|
int > = 0 >
|
|
void dump_integer(NumberType x)
|
|
{
|
|
static constexpr std::array<std::array<char, 2>, 100> digits_to_99
|
|
{
|
|
{
|
|
{{'0', '0'}}, {{'0', '1'}}, {{'0', '2'}}, {{'0', '3'}}, {{'0', '4'}}, {{'0', '5'}}, {{'0', '6'}}, {{'0', '7'}}, {{'0', '8'}}, {{'0', '9'}},
|
|
{{'1', '0'}}, {{'1', '1'}}, {{'1', '2'}}, {{'1', '3'}}, {{'1', '4'}}, {{'1', '5'}}, {{'1', '6'}}, {{'1', '7'}}, {{'1', '8'}}, {{'1', '9'}},
|
|
{{'2', '0'}}, {{'2', '1'}}, {{'2', '2'}}, {{'2', '3'}}, {{'2', '4'}}, {{'2', '5'}}, {{'2', '6'}}, {{'2', '7'}}, {{'2', '8'}}, {{'2', '9'}},
|
|
{{'3', '0'}}, {{'3', '1'}}, {{'3', '2'}}, {{'3', '3'}}, {{'3', '4'}}, {{'3', '5'}}, {{'3', '6'}}, {{'3', '7'}}, {{'3', '8'}}, {{'3', '9'}},
|
|
{{'4', '0'}}, {{'4', '1'}}, {{'4', '2'}}, {{'4', '3'}}, {{'4', '4'}}, {{'4', '5'}}, {{'4', '6'}}, {{'4', '7'}}, {{'4', '8'}}, {{'4', '9'}},
|
|
{{'5', '0'}}, {{'5', '1'}}, {{'5', '2'}}, {{'5', '3'}}, {{'5', '4'}}, {{'5', '5'}}, {{'5', '6'}}, {{'5', '7'}}, {{'5', '8'}}, {{'5', '9'}},
|
|
{{'6', '0'}}, {{'6', '1'}}, {{'6', '2'}}, {{'6', '3'}}, {{'6', '4'}}, {{'6', '5'}}, {{'6', '6'}}, {{'6', '7'}}, {{'6', '8'}}, {{'6', '9'}},
|
|
{{'7', '0'}}, {{'7', '1'}}, {{'7', '2'}}, {{'7', '3'}}, {{'7', '4'}}, {{'7', '5'}}, {{'7', '6'}}, {{'7', '7'}}, {{'7', '8'}}, {{'7', '9'}},
|
|
{{'8', '0'}}, {{'8', '1'}}, {{'8', '2'}}, {{'8', '3'}}, {{'8', '4'}}, {{'8', '5'}}, {{'8', '6'}}, {{'8', '7'}}, {{'8', '8'}}, {{'8', '9'}},
|
|
{{'9', '0'}}, {{'9', '1'}}, {{'9', '2'}}, {{'9', '3'}}, {{'9', '4'}}, {{'9', '5'}}, {{'9', '6'}}, {{'9', '7'}}, {{'9', '8'}}, {{'9', '9'}},
|
|
}
|
|
};
|
|
|
|
// special case for "0"
|
|
if (x == 0)
|
|
{
|
|
o->write_character('0');
|
|
return;
|
|
}
|
|
|
|
// use a pointer to fill the buffer
|
|
auto buffer_ptr = number_buffer.begin(); // NOLINT(llvm-qualified-auto,readability-qualified-auto,cppcoreguidelines-pro-type-vararg,hicpp-vararg)
|
|
|
|
number_unsigned_t abs_value;
|
|
|
|
unsigned int n_chars{};
|
|
|
|
if (is_negative_number(x))
|
|
{
|
|
*buffer_ptr = '-';
|
|
abs_value = remove_sign(static_cast<number_integer_t>(x));
|
|
|
|
// account one more byte for the minus sign
|
|
n_chars = 1 + count_digits(abs_value);
|
|
}
|
|
else
|
|
{
|
|
abs_value = static_cast<number_unsigned_t>(x);
|
|
n_chars = count_digits(abs_value);
|
|
}
|
|
|
|
// spare 1 byte for '\0'
|
|
JSON_ASSERT(n_chars < number_buffer.size() - 1);
|
|
|
|
// jump to the end to generate the string from backward,
|
|
// so we later avoid reversing the result
|
|
buffer_ptr += n_chars;
|
|
|
|
// Fast int2ascii implementation inspired by "Fastware" talk by Andrei Alexandrescu
|
|
// See: https://www.youtube.com/watch?v=o4-CwDo2zpg
|
|
while (abs_value >= 100)
|
|
{
|
|
const auto digits_index = static_cast<unsigned>((abs_value % 100));
|
|
abs_value /= 100;
|
|
*(--buffer_ptr) = digits_to_99[digits_index][1];
|
|
*(--buffer_ptr) = digits_to_99[digits_index][0];
|
|
}
|
|
|
|
if (abs_value >= 10)
|
|
{
|
|
const auto digits_index = static_cast<unsigned>(abs_value);
|
|
*(--buffer_ptr) = digits_to_99[digits_index][1];
|
|
*(--buffer_ptr) = digits_to_99[digits_index][0];
|
|
}
|
|
else
|
|
{
|
|
*(--buffer_ptr) = static_cast<char>('0' + abs_value);
|
|
}
|
|
|
|
o->write_characters(number_buffer.data(), n_chars);
|
|
}
|
|
|
|
/*!
|
|
@brief dump a floating-point number
|
|
|
|
Dump a given floating-point number to output stream @a o. Works internally
|
|
with @a number_buffer.
|
|
|
|
@param[in] x floating-point number to dump
|
|
*/
|
|
void dump_float(number_float_t x)
|
|
{
|
|
// NaN / inf
|
|
if (!std::isfinite(x))
|
|
{
|
|
o->write_characters("null", 4);
|
|
return;
|
|
}
|
|
|
|
// If number_float_t is an IEEE-754 single or double precision number,
|
|
// use the Grisu2 algorithm to produce short numbers which are
|
|
// guaranteed to round-trip, using strtof and strtod, resp.
|
|
//
|
|
// NB: The test below works if <long double> == <double>.
|
|
static constexpr bool is_ieee_single_or_double
|
|
= (std::numeric_limits<number_float_t>::is_iec559 && std::numeric_limits<number_float_t>::digits == 24 && std::numeric_limits<number_float_t>::max_exponent == 128) ||
|
|
(std::numeric_limits<number_float_t>::is_iec559 && std::numeric_limits<number_float_t>::digits == 53 && std::numeric_limits<number_float_t>::max_exponent == 1024);
|
|
|
|
dump_float(x, std::integral_constant<bool, is_ieee_single_or_double>());
|
|
}
|
|
|
|
void dump_float(number_float_t x, std::true_type /*is_ieee_single_or_double*/)
|
|
{
|
|
auto* begin = number_buffer.data();
|
|
auto* end = ::nlohmann::detail::to_chars(begin, begin + number_buffer.size(), x);
|
|
|
|
o->write_characters(begin, static_cast<size_t>(end - begin));
|
|
}
|
|
|
|
void dump_float(number_float_t x, std::false_type /*is_ieee_single_or_double*/)
|
|
{
|
|
// get number of digits for a float -> text -> float round-trip
|
|
static constexpr auto d = std::numeric_limits<number_float_t>::max_digits10;
|
|
|
|
// the actual conversion
|
|
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
|
|
std::ptrdiff_t len = (std::snprintf)(number_buffer.data(), number_buffer.size(), "%.*g", d, x);
|
|
|
|
// negative value indicates an error
|
|
JSON_ASSERT(len > 0);
|
|
// check if buffer was large enough
|
|
JSON_ASSERT(static_cast<std::size_t>(len) < number_buffer.size());
|
|
|
|
// erase thousands separator
|
|
if (thousands_sep != '\0')
|
|
{
|
|
// NOLINTNEXTLINE(readability-qualified-auto,llvm-qualified-auto): std::remove returns an iterator, see https://github.com/nlohmann/json/issues/3081
|
|
const auto end = std::remove(number_buffer.begin(), number_buffer.begin() + len, thousands_sep);
|
|
std::fill(end, number_buffer.end(), '\0');
|
|
JSON_ASSERT((end - number_buffer.begin()) <= len);
|
|
len = (end - number_buffer.begin());
|
|
}
|
|
|
|
// convert decimal point to '.'
|
|
if (decimal_point != '\0' && decimal_point != '.')
|
|
{
|
|
// NOLINTNEXTLINE(readability-qualified-auto,llvm-qualified-auto): std::find returns an iterator, see https://github.com/nlohmann/json/issues/3081
|
|
const auto dec_pos = std::find(number_buffer.begin(), number_buffer.end(), decimal_point);
|
|
if (dec_pos != number_buffer.end())
|
|
{
|
|
*dec_pos = '.';
|
|
}
|
|
}
|
|
|
|
o->write_characters(number_buffer.data(), static_cast<std::size_t>(len));
|
|
|
|
// determine if we need to append ".0"
|
|
const bool value_is_int_like =
|
|
std::none_of(number_buffer.begin(), number_buffer.begin() + len + 1,
|
|
[](char c)
|
|
{
|
|
return c == '.' || c == 'e';
|
|
});
|
|
|
|
if (value_is_int_like)
|
|
{
|
|
o->write_characters(".0", 2);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@brief check whether a string is UTF-8 encoded
|
|
|
|
The function checks each byte of a string whether it is UTF-8 encoded. The
|
|
result of the check is stored in the @a state parameter. The function must
|
|
be called initially with state 0 (accept). State 1 means the string must
|
|
be rejected, because the current byte is not allowed. If the string is
|
|
completely processed, but the state is non-zero, the string ended
|
|
prematurely; that is, the last byte indicated more bytes should have
|
|
followed.
|
|
|
|
@param[in,out] state the state of the decoding
|
|
@param[in,out] codep codepoint (valid only if resulting state is UTF8_ACCEPT)
|
|
@param[in] byte next byte to decode
|
|
@return new state
|
|
|
|
@note The function has been edited: a std::array is used.
|
|
|
|
@copyright Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
|
|
@sa http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
|
|
*/
|
|
static std::uint8_t decode(std::uint8_t& state, std::uint32_t& codep, const std::uint8_t byte) noexcept
|
|
{
|
|
static const std::array<std::uint8_t, 400> utf8d =
|
|
{
|
|
{
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00..1F
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20..3F
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40..5F
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60..7F
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, // 80..9F
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // A0..BF
|
|
8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C0..DF
|
|
0xA, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x4, 0x3, 0x3, // E0..EF
|
|
0xB, 0x6, 0x6, 0x6, 0x5, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, // F0..FF
|
|
0x0, 0x1, 0x2, 0x3, 0x5, 0x8, 0x7, 0x1, 0x1, 0x1, 0x4, 0x6, 0x1, 0x1, 0x1, 0x1, // s0..s0
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, // s1..s2
|
|
1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // s3..s4
|
|
1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, // s5..s6
|
|
1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 // s7..s8
|
|
}
|
|
};
|
|
|
|
JSON_ASSERT(byte < utf8d.size());
|
|
const std::uint8_t type = utf8d[byte];
|
|
|
|
codep = (state != UTF8_ACCEPT)
|
|
? (byte & 0x3fu) | (codep << 6u)
|
|
: (0xFFu >> type) & (byte);
|
|
|
|
std::size_t index = 256u + static_cast<size_t>(state) * 16u + static_cast<size_t>(type);
|
|
JSON_ASSERT(index < 400);
|
|
state = utf8d[index];
|
|
return state;
|
|
}
|
|
|
|
/*
|
|
* Overload to make the compiler happy while it is instantiating
|
|
* dump_integer for number_unsigned_t.
|
|
* Must never be called.
|
|
*/
|
|
number_unsigned_t remove_sign(number_unsigned_t x)
|
|
{
|
|
JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
|
|
return x; // LCOV_EXCL_LINE
|
|
}
|
|
|
|
/*
|
|
* Helper function for dump_integer
|
|
*
|
|
* This function takes a negative signed integer and returns its absolute
|
|
* value as unsigned integer. The plus/minus shuffling is necessary as we can
|
|
* not directly remove the sign of an arbitrary signed integer as the
|
|
* absolute values of INT_MIN and INT_MAX are usually not the same. See
|
|
* #1708 for details.
|
|
*/
|
|
inline number_unsigned_t remove_sign(number_integer_t x) noexcept
|
|
{
|
|
JSON_ASSERT(x < 0 && x < (std::numeric_limits<number_integer_t>::max)()); // NOLINT(misc-redundant-expression)
|
|
return static_cast<number_unsigned_t>(-(x + 1)) + 1;
|
|
}
|
|
|
|
private:
|
|
/// the output of the serializer
|
|
output_adapter_t<char> o = nullptr;
|
|
|
|
/// a (hopefully) large enough character buffer
|
|
std::array<char, 64> number_buffer{{}};
|
|
|
|
/// the locale
|
|
const std::lconv* loc = nullptr;
|
|
/// the locale's thousand separator character
|
|
const char thousands_sep = '\0';
|
|
/// the locale's decimal point character
|
|
const char decimal_point = '\0';
|
|
|
|
/// string buffer
|
|
std::array<char, 512> string_buffer{{}};
|
|
|
|
/// the indentation character
|
|
const char indent_char;
|
|
/// the indentation string
|
|
string_t indent_string;
|
|
|
|
/// error_handler how to react on decoding errors
|
|
const error_handler_t error_handler;
|
|
};
|
|
|
|
} // namespace detail
|
|
NLOHMANN_JSON_NAMESPACE_END
|