mirror of
https://github.com/nlohmann/json.git
synced 2024-12-27 07:37:51 +08:00
6ce2f35ba8
For some gcc version (Ubuntu 5.5.0-12ubuntu1~16.04) the existing code
crashes when the minimum value of int64_t is outputted.
Resurrect the code from before 546e2cbf (🚨 fixed some warnings,
2019-03-13) but delegate the sign removal so that the compilers don't
complain about taking the negative value of an unsigned value.
In addition we also rewrite the expression so that we first increment
and then negate.
The definition of remove_sign(number_unsigned_t) is never called as
unsigned values are never negative.
867 lines
33 KiB
C++
867 lines
33 KiB
C++
#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 <cassert> // assert
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#include <ciso646> // and, or
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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
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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/value_t.hpp>
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namespace nlohmann
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{
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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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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' : * (loc->thousands_sep))
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, decimal_point(loc->decimal_point == nullptr ? '\0' : * (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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@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] 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, 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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assert(i != val.m_value.object->cend());
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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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assert(i != val.m_value.object->cend());
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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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assert(not 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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assert(not 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::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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assert(false); // LCOV_EXCL_LINE
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}
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}
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private:
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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<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) or (ensure_ascii and (codepoint >= 0x7F)))
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{
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if (codepoint <= 0xFFFF)
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{
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(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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(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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std::string sn(3, '\0');
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(std::snprintf)(&sn[0], sn.size(), "%.2X", byte);
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JSON_THROW(type_error::create(316, "invalid UTF-8 byte at index " + std::to_string(i) + ": 0x" + sn));
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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;
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// thus removing/ignoring the invalid characters
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bytes = bytes_after_last_accept;
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if (error_handler == error_handler_t::replace)
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{
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// add a replacement character
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if (ensure_ascii)
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{
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string_buffer[bytes++] = '\\';
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string_buffer[bytes++] = 'u';
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string_buffer[bytes++] = 'f';
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string_buffer[bytes++] = 'f';
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string_buffer[bytes++] = 'f';
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string_buffer[bytes++] = 'd';
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}
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else
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{
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string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xEF');
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string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBF');
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string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBD');
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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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bytes_after_last_accept = bytes;
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}
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undumped_chars = 0;
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// continue processing the string
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state = UTF8_ACCEPT;
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break;
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}
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default: // LCOV_EXCL_LINE
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assert(false); // LCOV_EXCL_LINE
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}
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break;
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}
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default: // decode found yet incomplete multi-byte code point
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{
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if (not ensure_ascii)
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{
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// code point will not be escaped - copy byte to buffer
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string_buffer[bytes++] = s[i];
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}
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++undumped_chars;
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break;
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}
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}
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}
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// we finished processing the string
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if (JSON_HEDLEY_LIKELY(state == UTF8_ACCEPT))
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{
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// write buffer
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if (bytes > 0)
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{
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o->write_characters(string_buffer.data(), bytes);
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}
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}
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else
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{
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// we finish reading, but do not accept: string was incomplete
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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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std::string sn(3, '\0');
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(std::snprintf)(&sn[0], sn.size(), "%.2X", static_cast<std::uint8_t>(s.back()));
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JSON_THROW(type_error::create(316, "incomplete UTF-8 string; last byte: 0x" + sn));
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}
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case error_handler_t::ignore:
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{
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// write all accepted bytes
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o->write_characters(string_buffer.data(), bytes_after_last_accept);
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break;
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}
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case error_handler_t::replace:
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{
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// 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
|
|
assert(false); // LCOV_EXCL_LINE
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@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 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_same<NumberType, number_unsigned_t>::value or
|
|
std::is_same<NumberType, number_integer_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();
|
|
|
|
const bool is_negative = std::is_same<NumberType, number_integer_t>::value and not(x >= 0); // see issue #755
|
|
number_unsigned_t abs_value;
|
|
|
|
unsigned int n_chars;
|
|
|
|
if (is_negative)
|
|
{
|
|
*buffer_ptr = '-';
|
|
abs_value = remove_sign(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'
|
|
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 (not 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 and std::numeric_limits<number_float_t>::digits == 24 and std::numeric_limits<number_float_t>::max_exponent == 128) or
|
|
(std::numeric_limits<number_float_t>::is_iec559 and std::numeric_limits<number_float_t>::digits == 53 and 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*/)
|
|
{
|
|
char* begin = number_buffer.data();
|
|
char* 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
|
|
std::ptrdiff_t len = (std::snprintf)(number_buffer.data(), number_buffer.size(), "%.*g", d, x);
|
|
|
|
// negative value indicates an error
|
|
assert(len > 0);
|
|
// check if buffer was large enough
|
|
assert(static_cast<std::size_t>(len) < number_buffer.size());
|
|
|
|
// erase thousands separator
|
|
if (thousands_sep != '\0')
|
|
{
|
|
const auto end = std::remove(number_buffer.begin(),
|
|
number_buffer.begin() + len, thousands_sep);
|
|
std::fill(end, number_buffer.end(), '\0');
|
|
assert((end - number_buffer.begin()) <= len);
|
|
len = (end - number_buffer.begin());
|
|
}
|
|
|
|
// convert decimal point to '.'
|
|
if (decimal_point != '\0' and decimal_point != '.')
|
|
{
|
|
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 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 == '.' or 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
|
|
}
|
|
};
|
|
|
|
const std::uint8_t type = utf8d[byte];
|
|
|
|
codep = (state != UTF8_ACCEPT)
|
|
? (byte & 0x3fu) | (codep << 6u)
|
|
: (0xFFu >> type) & (byte);
|
|
|
|
state = utf8d[256u + state * 16u + type];
|
|
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)
|
|
{
|
|
assert(false); // 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
|
|
{
|
|
assert(x < 0 and x < (std::numeric_limits<number_integer_t>::max)());
|
|
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
|
|
} // namespace nlohmann
|