Mercurial > code
view C++/modules/Json/Json.cpp @ 405:f81478065901
Json:
- Complete rewrite,
- Convert jansson tree to own C++ tree,
- Conversion from Value to Object/Array makes copies
author | David Demelier <markand@malikania.fr> |
---|---|
date | Mon, 05 Oct 2015 17:04:40 +0200 |
parents | 9ab878fb9fa2 |
children | d485d36a8de1 |
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/* * Json.cpp -- C++14 JSON manipulation using jansson parser * * Copyright (c) 2013-2015 David Demelier <markand@malikania.fr> * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "Json.h" #include <jansson.h> namespace json { namespace { void readObject(Value &parent, json_t *object); void readArray(Value &parent, json_t *array); Value readValue(json_t *v) { if (json_is_null(v)) { return Value{nullptr}; } if (json_is_string(v)) { return Value{json_string_value(v)}; } if (json_is_number(v)) { return Value{json_number_value(v)}; } if (json_is_boolean(v)) { return Value{json_boolean_value(v)}; } if (json_is_object(v)) { Object object; readObject(object, v); return object; } if (json_is_array(v)) { Array array; readArray(array, v); return array; } return Value{}; } void readObject(Value &parent, json_t *object) { const char *key; json_t *value; json_object_foreach(object, key, value) { static_cast<Object &>(parent).insert(key, readValue(value)); } } void readArray(Value &parent, json_t *array) { size_t index; json_t *value; json_array_foreach(array, index, value) { static_cast<Array &>(parent).append(readValue(value)); } } template <typename Func, typename... Args> Value convert(Func fn, Args&&... args) { json_error_t error; json_t *json = fn(std::forward<Args>(args)..., &error); if (json == nullptr) { throw Error{error.text, error.source, error.line, error.column, error.position}; } Value value; if (json_is_object(json)) { value = Object{}; readObject(value, json); } else { value = Array{}; readArray(value, json); } json_decref(json); return value; } } // !namespace bool Value::toBool() const noexcept { if (m_type != Type::Boolean) return false; return m_boolean; } double Value::toNumber() const noexcept { if (m_type != Type::Number) return 0; return m_number; } std::string Value::toString() const noexcept { if (m_type != Type::String) { return ""; } return m_string; } Object Value::toObject() const noexcept { if (m_type != Type::Object) { return Object{}; } return Object(*this); } Array Value::toArray() const noexcept { if (m_type != Type::Array) { return Array{}; } return Array(*this); } Document::Document(Buffer buffer) { m_value = convert(json_loads, buffer.text.c_str(), 0); } Document::Document(File file) { m_value = convert(json_load_file, file.path.c_str(), 0); } } // !json