dafee1343c
This makes the depth independent of the indent_step and independent of whether it's indenting at all
370 lines
12 KiB
C++
370 lines
12 KiB
C++
#pragma once
|
|
|
|
#include <algorithm> // reverse, remove, fill, find, none_of
|
|
#include <array> // array
|
|
#include <cassert> // assert
|
|
#include <ciso646> // and, or
|
|
#include <clocale> // localeconv, lconv
|
|
#include <cmath> // labs, isfinite, isnan, signbit
|
|
#include <cstddef> // size_t, ptrdiff_t
|
|
#include <cstdint> // uint8_t
|
|
#include <cstdio> // snprintf
|
|
#include <limits> // numeric_limits
|
|
#include <string> // string
|
|
#include <type_traits> // is_same
|
|
|
|
#include <nlohmann/detail/exceptions.hpp>
|
|
#include <nlohmann/detail/conversions/to_chars.hpp>
|
|
#include <nlohmann/detail/macro_scope.hpp>
|
|
#include <nlohmann/detail/meta.hpp>
|
|
#include <nlohmann/detail/output/output_adapters.hpp>
|
|
#include <nlohmann/detail/value_t.hpp>
|
|
#include <nlohmann/detail/output/primitive_serializer.hpp>
|
|
|
|
namespace nlohmann
|
|
{
|
|
|
|
struct fancy_serializer_style
|
|
{
|
|
unsigned int indent_step = 0;
|
|
char indent_char = ' ';
|
|
|
|
unsigned int strings_maximum_length = 0;
|
|
};
|
|
|
|
namespace detail
|
|
{
|
|
///////////////////
|
|
// serialization //
|
|
///////////////////
|
|
|
|
template<typename BasicJsonType>
|
|
class fancy_serializer
|
|
{
|
|
using primitive_serializer_t = primitive_serializer<BasicJsonType>;
|
|
using string_t = typename BasicJsonType::string_t;
|
|
using number_float_t = typename BasicJsonType::number_float_t;
|
|
using number_integer_t = typename BasicJsonType::number_integer_t;
|
|
using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
|
|
static constexpr uint8_t UTF8_ACCEPT = 0;
|
|
static constexpr uint8_t UTF8_REJECT = 1;
|
|
|
|
public:
|
|
/*!
|
|
@param[in] s output stream to serialize to
|
|
@param[in] ichar indentation character to use
|
|
*/
|
|
fancy_serializer(output_adapter_t<char> s,
|
|
const fancy_serializer_style& st)
|
|
: o(std::move(s)), indent_string(512, st.indent_char), style(st)
|
|
{}
|
|
|
|
// delete because of pointer members
|
|
fancy_serializer(const fancy_serializer&) = delete;
|
|
fancy_serializer& operator=(const fancy_serializer&) = delete;
|
|
|
|
/*!
|
|
@brief internal implementation of the serialization function
|
|
|
|
This function is called by the public member function dump and organizes
|
|
the serialization internally. The indentation level is propagated as
|
|
additional parameter. In case of arrays and objects, the function is
|
|
called recursively.
|
|
|
|
- strings and object keys are escaped using `escape_string()`
|
|
- integer numbers are converted implicitly via `operator<<`
|
|
- floating-point numbers are converted to a string using `"%g"` format
|
|
|
|
@param[in] val value to serialize
|
|
@param[in] pretty_print whether the output shall be pretty-printed
|
|
@param[in] depth the current recursive depth
|
|
*/
|
|
void dump(const BasicJsonType& val,
|
|
const bool ensure_ascii,
|
|
const unsigned int depth = 0)
|
|
{
|
|
switch (val.m_type)
|
|
{
|
|
case value_t::object:
|
|
{
|
|
dump_object(val, ensure_ascii, depth);
|
|
return;
|
|
}
|
|
|
|
case value_t::array:
|
|
{
|
|
dump_array(val, ensure_ascii, depth);
|
|
return;
|
|
}
|
|
|
|
case value_t::string:
|
|
{
|
|
dump_string(*val.m_value.string, ensure_ascii);
|
|
return;
|
|
}
|
|
|
|
case value_t::boolean:
|
|
{
|
|
if (val.m_value.boolean)
|
|
{
|
|
o->write_characters("true", 4);
|
|
}
|
|
else
|
|
{
|
|
o->write_characters("false", 5);
|
|
}
|
|
return;
|
|
}
|
|
|
|
case value_t::number_integer:
|
|
{
|
|
prim_serializer.dump_integer(*o, val.m_value.number_integer);
|
|
return;
|
|
}
|
|
|
|
case value_t::number_unsigned:
|
|
{
|
|
prim_serializer.dump_integer(*o, val.m_value.number_unsigned);
|
|
return;
|
|
}
|
|
|
|
case value_t::number_float:
|
|
{
|
|
prim_serializer.dump_float(*o, val.m_value.number_float);
|
|
return;
|
|
}
|
|
|
|
case value_t::discarded:
|
|
{
|
|
o->write_characters("<discarded>", 11);
|
|
return;
|
|
}
|
|
|
|
case value_t::null:
|
|
{
|
|
o->write_characters("null", 4);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
private:
|
|
void dump_object(const BasicJsonType& val, bool ensure_ascii, unsigned int depth)
|
|
{
|
|
if (val.m_value.object->empty())
|
|
{
|
|
o->write_characters("{}", 2);
|
|
return;
|
|
}
|
|
|
|
if (style.indent_step > 0)
|
|
{
|
|
o->write_characters("{\n", 2);
|
|
|
|
// variable to hold indentation for recursive calls
|
|
const auto old_indent = depth * style.indent_step;
|
|
const auto new_indent = (depth + 1) * style.indent_step;
|
|
if (JSON_UNLIKELY(indent_string.size() < new_indent))
|
|
{
|
|
indent_string.resize(indent_string.size() * 2, ' ');
|
|
}
|
|
|
|
// first n-1 elements
|
|
auto i = val.m_value.object->cbegin();
|
|
for (std::size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
|
|
{
|
|
o->write_characters(indent_string.c_str(), new_indent);
|
|
o->write_character('\"');
|
|
prim_serializer.dump_escaped(*o, i->first, ensure_ascii);
|
|
o->write_characters("\": ", 3);
|
|
dump(i->second, ensure_ascii, depth + 1);
|
|
o->write_characters(",\n", 2);
|
|
}
|
|
|
|
// last element
|
|
assert(i != val.m_value.object->cend());
|
|
assert(std::next(i) == val.m_value.object->cend());
|
|
o->write_characters(indent_string.c_str(), new_indent);
|
|
o->write_character('\"');
|
|
prim_serializer.dump_escaped(*o, i->first, ensure_ascii);
|
|
o->write_characters("\": ", 3);
|
|
dump(i->second, ensure_ascii, depth + 1);
|
|
|
|
o->write_character('\n');
|
|
o->write_characters(indent_string.c_str(), old_indent);
|
|
o->write_character('}');
|
|
}
|
|
else
|
|
{
|
|
o->write_character('{');
|
|
|
|
// first n-1 elements
|
|
auto i = val.m_value.object->cbegin();
|
|
for (std::size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
|
|
{
|
|
o->write_character('\"');
|
|
prim_serializer.dump_escaped(*o, i->first, ensure_ascii);
|
|
o->write_characters("\":", 2);
|
|
dump(i->second, ensure_ascii, depth + 1);
|
|
o->write_character(',');
|
|
}
|
|
|
|
// last element
|
|
assert(i != val.m_value.object->cend());
|
|
assert(std::next(i) == val.m_value.object->cend());
|
|
o->write_character('\"');
|
|
prim_serializer.dump_escaped(*o, i->first, ensure_ascii);
|
|
o->write_characters("\":", 2);
|
|
dump(i->second, ensure_ascii, depth + 1);
|
|
|
|
o->write_character('}');
|
|
}
|
|
}
|
|
|
|
void dump_array(const BasicJsonType& val, bool ensure_ascii, unsigned int depth)
|
|
{
|
|
if (val.m_value.array->empty())
|
|
{
|
|
o->write_characters("[]", 2);
|
|
return;
|
|
}
|
|
|
|
if (style.indent_step > 0)
|
|
{
|
|
o->write_characters("[\n", 2);
|
|
|
|
// variable to hold indentation for recursive calls
|
|
const auto old_indent = depth * style.indent_step;
|
|
const auto new_indent = (depth + 1) * style.indent_step;
|
|
if (JSON_UNLIKELY(indent_string.size() < new_indent))
|
|
{
|
|
indent_string.resize(indent_string.size() * 2, ' ');
|
|
}
|
|
|
|
// first n-1 elements
|
|
for (auto i = val.m_value.array->cbegin();
|
|
i != val.m_value.array->cend() - 1; ++i)
|
|
{
|
|
o->write_characters(indent_string.c_str(), new_indent);
|
|
dump(*i, ensure_ascii, depth + 1);
|
|
o->write_characters(",\n", 2);
|
|
}
|
|
|
|
// last element
|
|
assert(not val.m_value.array->empty());
|
|
o->write_characters(indent_string.c_str(), new_indent);
|
|
dump(val.m_value.array->back(), ensure_ascii, depth + 1);
|
|
|
|
o->write_character('\n');
|
|
o->write_characters(indent_string.c_str(), old_indent);
|
|
o->write_character(']');
|
|
}
|
|
else
|
|
{
|
|
o->write_character('[');
|
|
|
|
// first n-1 elements
|
|
for (auto i = val.m_value.array->cbegin();
|
|
i != val.m_value.array->cend() - 1; ++i)
|
|
{
|
|
dump(*i, ensure_ascii, depth + 1);
|
|
o->write_character(',');
|
|
}
|
|
|
|
// last element
|
|
assert(not val.m_value.array->empty());
|
|
dump(val.m_value.array->back(), ensure_ascii, depth + 1);
|
|
|
|
o->write_character(']');
|
|
}
|
|
}
|
|
|
|
void dump_string(string_t const& str, bool ensure_ascii)
|
|
{
|
|
o->write_character('\"');
|
|
if (style.strings_maximum_length == 0)
|
|
{
|
|
prim_serializer.dump_escaped(*o, str, ensure_ascii);
|
|
}
|
|
else
|
|
{
|
|
std::stringstream ss;
|
|
nlohmann::detail::output_adapter<char> o_string(ss);
|
|
nlohmann::detail::output_adapter_t<char> oo_string = o_string;
|
|
prim_serializer.dump_escaped(*oo_string, str, ensure_ascii);
|
|
|
|
std::string full_str = ss.str();
|
|
if (full_str.size() <= style.strings_maximum_length)
|
|
{
|
|
o->write_characters(full_str.c_str(), full_str.size());
|
|
}
|
|
else
|
|
{
|
|
const unsigned start_len = [](unsigned int maxl)
|
|
{
|
|
if (maxl <= 3)
|
|
{
|
|
// There is only room for the ellipsis,
|
|
// no characters from the string
|
|
return 0u;
|
|
}
|
|
else if (maxl <= 5)
|
|
{
|
|
// With four allowed characters, we add in the
|
|
// first from the string. With five, we add in
|
|
// the *last* instead, so still just one at
|
|
// the start.
|
|
return 1u;
|
|
}
|
|
else
|
|
{
|
|
// We subtract three for the ellipsis
|
|
// and one for the last character.
|
|
return maxl - 4;
|
|
}
|
|
}(style.strings_maximum_length);
|
|
|
|
const unsigned end_len =
|
|
style.strings_maximum_length >= 5 ? 1 : 0;
|
|
|
|
const unsigned ellipsis_length =
|
|
style.strings_maximum_length >= 3
|
|
? 3
|
|
: style.strings_maximum_length;
|
|
|
|
o->write_characters(full_str.c_str(), start_len);
|
|
o->write_characters("...", ellipsis_length);
|
|
o->write_characters(full_str.c_str() + str.size() - end_len, end_len);
|
|
}
|
|
}
|
|
o->write_character('\"');
|
|
}
|
|
|
|
private:
|
|
/// the output of the fancy_serializer
|
|
output_adapter_t<char> o = nullptr;
|
|
|
|
/// the indentation string
|
|
string_t indent_string;
|
|
|
|
/// Used for serializing "base" objects. Strings are sort of
|
|
/// counted in this, but not completely.
|
|
primitive_serializer_t prim_serializer;
|
|
|
|
/// Output style
|
|
fancy_serializer_style style;
|
|
};
|
|
}
|
|
|
|
template<typename BasicJsonType>
|
|
std::ostream& fancy_dump(std::ostream& o, const BasicJsonType& j,
|
|
fancy_serializer_style style)
|
|
{
|
|
// do the actual serialization
|
|
detail::fancy_serializer<BasicJsonType> s(detail::output_adapter<char>(o), style);
|
|
s.dump(j, false, 0u);
|
|
return o;
|
|
}
|
|
|
|
}
|