mirror of
https://github.com/wpilibsuite/allwpilib
synced 2026-06-21 01:01:43 +00:00
Prepare wpiutil for merge into allwpilib.
This commit is contained in:
Peter Johnson
433
wpiutil/src/main/native/cpp/support/json_serializer.cpp
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433
wpiutil/src/main/native/cpp/support/json_serializer.cpp
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/*----------------------------------------------------------------------------*/
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/* Modifications Copyright (c) FIRST 2017. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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/*
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__ _____ _____ _____
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__| | __| | | | JSON for Modern C++
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| | |__ | | | | | | version 2.1.1
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|_____|_____|_____|_|___| https://github.com/nlohmann/json
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Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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Copyright (c) 2013-2017 Niels Lohmann <http://nlohmann.me>.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#define WPI_JSON_IMPLEMENTATION
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#include "support/json.h"
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#include "llvm/SmallString.h"
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#include "llvm/StringExtras.h"
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#include "json_serializer.h"
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using namespace wpi;
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void json::serializer::dump(const json& val,
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const bool pretty_print,
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const unsigned int indent_step,
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const unsigned int current_indent)
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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 << "{}";
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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 << "{\n";
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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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// first n-1 elements
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auto i = val.m_value.object->begin();
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for (size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
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{
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o.indent(new_indent);
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o << '\"';
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dump_escaped(i->first());
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o << "\": ";
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dump(i->second, true, indent_step, new_indent);
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o << ",\n";
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}
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// last element
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assert(i != val.m_value.object->end());
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o.indent(new_indent);
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o << '\"';
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dump_escaped(i->first());
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o << "\": ";
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dump(i->second, true, indent_step, new_indent);
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o << '\n';
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o.indent(current_indent);
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o << '}';
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}
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else
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{
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o << '{';
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// first n-1 elements
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auto i = val.m_value.object->begin();
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for (size_t cnt = 0; cnt < val.m_value.object->size() - 1; ++cnt, ++i)
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{
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o << '\"';
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dump_escaped(i->first());
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o << "\":";
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dump(i->second, false, indent_step, current_indent);
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o << ',';
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}
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// last element
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assert(i != val.m_value.object->end());
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o << '\"';
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dump_escaped(i->first());
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o << "\":";
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dump(i->second, false, indent_step, current_indent);
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o << '}';
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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 << "[]";
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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 << "[\n";
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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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// first n-1 elements
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for (auto i = val.m_value.array->cbegin(); i != val.m_value.array->cend() - 1; ++i)
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{
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o.indent(new_indent);
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dump(*i, true, indent_step, new_indent);
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o << ",\n";
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}
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// last element
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assert(!val.m_value.array->empty());
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o.indent(new_indent);
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dump(val.m_value.array->back(), true, indent_step, new_indent);
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o << '\n';
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o.indent(current_indent);
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o << ']';
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}
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else
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{
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o << '[';
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// first n-1 elements
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for (auto i = val.m_value.array->cbegin(); i != val.m_value.array->cend() - 1; ++i)
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{
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dump(*i, false, indent_step, current_indent);
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o << ',';
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}
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// last element
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assert(!val.m_value.array->empty());
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dump(val.m_value.array->back(), false, indent_step, current_indent);
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o << ']';
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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 << '\"';
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dump_escaped(*val.m_value.string);
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o << '\"';
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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 << "true";
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}
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else
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{
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o << "false";
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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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o << static_cast<long long>(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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o << static_cast<unsigned long long>(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 << "<discarded>";
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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 << "null";
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return;
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}
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}
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}
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void json::serializer::dump_escaped(llvm::StringRef s) const
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{
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for (const auto& c : s)
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{
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switch (c)
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{
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// quotation mark (0x22)
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case '"':
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{
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o << '\\' << '"';
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break;
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}
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// reverse solidus (0x5c)
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case '\\':
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{
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// nothing to change
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o << '\\' << '\\';
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break;
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}
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// backspace (0x08)
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case '\b':
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{
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o << '\\' << 'b';
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break;
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}
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// formfeed (0x0c)
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case '\f':
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{
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o << '\\' << 'f';
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break;
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}
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// newline (0x0a)
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case '\n':
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{
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o << '\\' << 'n';
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break;
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}
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// carriage return (0x0d)
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case '\r':
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{
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o << '\\' << 'r';
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break;
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}
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// horizontal tab (0x09)
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case '\t':
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{
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o << '\\' << 't';
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break;
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}
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case 0x00:
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case 0x01:
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case 0x02:
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case 0x03:
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case 0x04:
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case 0x05:
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case 0x06:
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case 0x07:
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case 0x0b:
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case 0x0e:
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case 0x0f:
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case 0x10:
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x17:
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case 0x18:
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case 0x19:
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case 0x1a:
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case 0x1b:
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case 0x1c:
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case 0x1d:
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case 0x1e:
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case 0x1f:
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{
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// print character c as \uxxxx
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o << "\\u00";
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o << llvm::hexdigit((c >> 4) & 0xf, true);
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o << llvm::hexdigit((c >> 0) & 0xf, true);
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break;
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}
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default:
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{
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// all other characters are added as-is
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o << c;
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break;
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}
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}
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}
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}
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void json::serializer::dump_float(double x)
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{
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// NaN / inf
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if (!std::isfinite(x) || std::isnan(x))
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{
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o << "null";
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return;
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}
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// special case for 0.0 and -0.0
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if (x == 0)
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{
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if (std::signbit(x))
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{
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o << "-0.0";
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}
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else
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{
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o << "0.0";
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}
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return;
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}
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// get number of digits for a text -> float -> text round-trip
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static constexpr auto d = std::numeric_limits<double>::digits10;
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// the actual conversion
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llvm::SmallString<64> number_buffer;
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number_buffer.resize(64);
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std::ptrdiff_t len = snprintf(number_buffer.data(), number_buffer.size(),
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"%.*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<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,
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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' && decimal_point != '.')
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{
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for (auto& c : number_buffer)
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{
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if (c == decimal_point)
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{
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c = '.';
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break;
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}
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}
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}
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o.write(number_buffer.data(), static_cast<size_t>(len));
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// determine if need to append ".0"
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const bool value_is_int_like = std::none_of(number_buffer.begin(),
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number_buffer.begin() + len + 1,
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[](char c)
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{
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return c == '.' || c == 'e';
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});
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if (value_is_int_like)
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{
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o << ".0";
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}
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}
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namespace wpi {
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llvm::raw_ostream& operator<<(llvm::raw_ostream& o, const json& j)
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{
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j.dump(o, 0);
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return o;
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}
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} // namespace wpi
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std::string json::dump(int indent) const
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{
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std::string s;
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llvm::raw_string_ostream os(s);
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dump(os, indent);
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os.flush();
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return s;
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}
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void json::dump(llvm::raw_ostream& os, int indent) const
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{
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serializer s(os);
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if (indent >= 0)
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{
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s.dump(*this, true, static_cast<unsigned int>(indent));
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}
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else
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{
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s.dump(*this, false, 0);
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}
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}
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