mirror of
https://github.com/nlohmann/json
synced 2024-12-11 20:20:06 +00:00
632 lines
24 KiB
C++
632 lines
24 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 <nlohmann/detail/exceptions.hpp>
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#include <nlohmann/detail/conversions/to_chars.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/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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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 uint8_t UTF8_ACCEPT = 0;
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static constexpr 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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*/
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serializer(output_adapter_t<char> s, const char ichar)
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: o(std::move(s)), 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), indent_string(512, indent_char)
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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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/*!
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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_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_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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}
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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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uint32_t codepoint;
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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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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<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<uint16_t>(0xD7C0 + (codepoint >> 10)),
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static_cast<uint16_t>(0xDC00 + (codepoint & 0x3FF)));
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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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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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std::string sn(3, '\0');
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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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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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break;
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}
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}
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}
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if (JSON_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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std::string sn(3, '\0');
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snprintf(&sn[0], sn.size(), "%.2X", static_cast<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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}
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/*!
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@brief dump an integer
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Dump a given integer to output stream @a o. Works internally with
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@a number_buffer.
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@param[in] x integer number (signed or unsigned) to dump
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@tparam NumberType either @a number_integer_t or @a number_unsigned_t
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*/
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template<typename NumberType, detail::enable_if_t<
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std::is_same<NumberType, number_unsigned_t>::value or
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std::is_same<NumberType, number_integer_t>::value,
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int> = 0>
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void dump_integer(NumberType x)
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{
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// special case for "0"
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if (x == 0)
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{
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o->write_character('0');
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return;
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}
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const bool is_negative = (x <= 0) and (x != 0); // see issue #755
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std::size_t i = 0;
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while (x != 0)
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{
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// spare 1 byte for '\0'
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assert(i < number_buffer.size() - 1);
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const auto digit = std::labs(static_cast<long>(x % 10));
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number_buffer[i++] = static_cast<char>('0' + digit);
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x /= 10;
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}
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if (is_negative)
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{
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// make sure there is capacity for the '-'
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assert(i < number_buffer.size() - 2);
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number_buffer[i++] = '-';
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}
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std::reverse(number_buffer.begin(), number_buffer.begin() + i);
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o->write_characters(number_buffer.data(), i);
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}
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/*!
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@brief dump a floating-point number
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Dump a given floating-point number to output stream @a o. Works internally
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with @a number_buffer.
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@param[in] x floating-point number to dump
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*/
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void dump_float(number_float_t x)
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{
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// NaN / inf
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if (not std::isfinite(x))
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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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// If number_float_t is an IEEE-754 single or double precision number,
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// use the Grisu2 algorithm to produce short numbers which are
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// guaranteed to round-trip, using strtof and strtod, resp.
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//
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// NB: The test below works if <long double> == <double>.
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static constexpr bool is_ieee_single_or_double
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= (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
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(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);
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dump_float(x, std::integral_constant<bool, is_ieee_single_or_double>());
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}
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void dump_float(number_float_t x, std::true_type /*is_ieee_single_or_double*/)
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{
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char* begin = number_buffer.data();
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char* end = ::nlohmann::detail::to_chars(begin, begin + number_buffer.size(), x);
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o->write_characters(begin, static_cast<size_t>(end - begin));
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}
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void dump_float(number_float_t x, std::false_type /*is_ieee_single_or_double*/)
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{
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// get number of digits for a float -> text -> float round-trip
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static constexpr auto d = std::numeric_limits<number_float_t>::max_digits10;
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// the actual conversion
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std::ptrdiff_t len = snprintf(number_buffer.data(), number_buffer.size(), "%.*g", d, x);
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// negative value indicates an error
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assert(len > 0);
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// check if buffer was large enough
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assert(static_cast<std::size_t>(len) < number_buffer.size());
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// erase thousands separator
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if (thousands_sep != '\0')
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{
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const auto end = std::remove(number_buffer.begin(),
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number_buffer.begin() + len, thousands_sep);
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std::fill(end, number_buffer.end(), '\0');
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assert((end - number_buffer.begin()) <= len);
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len = (end - number_buffer.begin());
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}
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// convert decimal point to '.'
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if (decimal_point != '\0' and decimal_point != '.')
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{
|
|
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 uint8_t decode(uint8_t& state, uint32_t& codep, const uint8_t byte) noexcept
|
|
{
|
|
static const std::array<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 uint8_t type = utf8d[byte];
|
|
|
|
codep = (state != UTF8_ACCEPT)
|
|
? (byte & 0x3fu) | (codep << 6)
|
|
: static_cast<uint32_t>(0xff >> type) & (byte);
|
|
|
|
state = utf8d[256u + state * 16u + type];
|
|
return state;
|
|
}
|
|
|
|
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;
|
|
};
|
|
}
|
|
}
|