Add 'libnbtplusplus/' from commit '1a0ffe372f4da8408c5d08a36013536a3396b9e6'

git-subtree-dir: libnbtplusplus
git-subtree-mainline: 7fb132859fda54aa96bc9dd46d302b343eeb5a02
git-subtree-split: 1a0ffe372f4da8408c5d08a36013536a3396b9e6

1 files changed, 327 insertions, 0 deletions

diff --git a/libnbtplusplus/src/value.cpp b/libnbtplusplus/src/value.cpp
new file mode 100644
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+++ b/libnbtplusplus/src/value.cpp
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+// SPDX-FileCopyrightText: 2013, 2015 ljfa-ag <ljfa-ag@web.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+/*
+ * libnbt++ - A library for the Minecraft Named Binary Tag format.
+ * Copyright (C) 2013, 2015  ljfa-ag
+ *
+ * This file is part of libnbt++.
+ *
+ * libnbt++ is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libnbt++ is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libnbt++.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "value.h"
+#include "nbt_tags.h"
+#include <typeinfo>
+#include <algorithm>
+#include <initializer_list>
+#include <cstdint>
+#include <memory>
+
+namespace nbt
+{
+
+	value::value(tag&& t) : tag_(std::move(t).move_clone()) {}
+
+	value::value(const value& rhs)
+		: tag_(rhs.tag_ ? rhs.tag_->clone() : nullptr)
+	{
+	}
+
+	value& value::operator=(const value& rhs)
+	{
+		if (this != &rhs) {
+			tag_ = rhs.tag_ ? rhs.tag_->clone() : nullptr;
+		}
+		return *this;
+	}
+
+	value& value::operator=(tag&& t)
+	{
+		set(std::move(t));
+		return *this;
+	}
+
+	void value::set(tag&& t)
+	{
+		if (tag_)
+			tag_->assign(std::move(t));
+		else
+			tag_ = std::move(t).move_clone();
+	}
+
+	// Primitive assignment
+	namespace // helper functions local to this translation unit
+	{
+		template <typename T>
+		void assign_numeric_impl(std::unique_ptr<tag>& tag_ptr, T val,
+								 tag_type default_type)
+		{
+			using nbt::tag_type;
+			if (!tag_ptr) {
+				tag_ptr = tag::create(default_type, val);
+				return;
+			}
+
+			// Determine the incoming tag type for T
+			auto incoming_type = detail::get_primitive_type<T>::value;
+
+			// If the existing tag is of a narrower type than the incoming type,
+			// reject the assignment to avoid widening the stored tag type.
+			auto existing_type = tag_ptr->get_type();
+
+			if (static_cast<int>(existing_type) <
+				static_cast<int>(incoming_type)) {
+				throw std::bad_cast();
+			}
+
+			// Existing type is same or wider: write into the existing tag (may
+			// narrow)
+			switch (existing_type) {
+				case tag_type::Byte:
+					static_cast<tag_byte&>(*tag_ptr).set(
+						static_cast<int8_t>(val));
+					break;
+				case tag_type::Short:
+					static_cast<tag_short&>(*tag_ptr).set(
+						static_cast<int16_t>(val));
+					break;
+				case tag_type::Int:
+					static_cast<tag_int&>(*tag_ptr).set(
+						static_cast<int32_t>(val));
+					break;
+				case tag_type::Long:
+					static_cast<tag_long&>(*tag_ptr).set(
+						static_cast<int64_t>(val));
+					break;
+				case tag_type::Float:
+					static_cast<tag_float&>(*tag_ptr).set(
+						static_cast<float>(val));
+					break;
+				case tag_type::Double:
+					static_cast<tag_double&>(*tag_ptr).set(
+						static_cast<double>(val));
+					break;
+				default:
+					throw std::bad_cast();
+			}
+		}
+	} // namespace
+
+	value& value::operator=(int8_t val)
+	{
+		assign_numeric_impl(tag_, val, tag_type::Byte);
+		return *this;
+	}
+
+	value& value::operator=(int16_t val)
+	{
+		assign_numeric_impl(tag_, val, tag_type::Short);
+		return *this;
+	}
+
+	value& value::operator=(int32_t val)
+	{
+		assign_numeric_impl(tag_, val, tag_type::Int);
+		return *this;
+	}
+
+	value& value::operator=(int64_t val)
+	{
+		assign_numeric_impl(tag_, val, tag_type::Long);
+		return *this;
+	}
+
+	value& value::operator=(float val)
+	{
+		assign_numeric_impl(tag_, val, tag_type::Float);
+		return *this;
+	}
+
+	value& value::operator=(double val)
+	{
+		assign_numeric_impl(tag_, val, tag_type::Double);
+		return *this;
+	}
+
+	// Primitive conversion
+	value::operator int8_t() const
+	{
+		switch (tag_->get_type()) {
+			case tag_type::Byte:
+				return static_cast<tag_byte&>(*tag_).get();
+
+			default:
+				throw std::bad_cast();
+		}
+	}
+
+	value::operator int16_t() const
+	{
+		switch (tag_->get_type()) {
+			case tag_type::Byte:
+				return static_cast<tag_byte&>(*tag_).get();
+			case tag_type::Short:
+				return static_cast<tag_short&>(*tag_).get();
+
+			default:
+				throw std::bad_cast();
+		}
+	}
+
+	value::operator int32_t() const
+	{
+		switch (tag_->get_type()) {
+			case tag_type::Byte:
+				return static_cast<tag_byte&>(*tag_).get();
+			case tag_type::Short:
+				return static_cast<tag_short&>(*tag_).get();
+			case tag_type::Int:
+				return static_cast<tag_int&>(*tag_).get();
+
+			default:
+				throw std::bad_cast();
+		}
+	}
+
+	value::operator int64_t() const
+	{
+		switch (tag_->get_type()) {
+			case tag_type::Byte:
+				return static_cast<tag_byte&>(*tag_).get();
+			case tag_type::Short:
+				return static_cast<tag_short&>(*tag_).get();
+			case tag_type::Int:
+				return static_cast<tag_int&>(*tag_).get();
+			case tag_type::Long:
+				return static_cast<tag_long&>(*tag_).get();
+
+			default:
+				throw std::bad_cast();
+		}
+	}
+
+	value::operator float() const
+	{
+		switch (tag_->get_type()) {
+			case tag_type::Byte:
+				return static_cast<tag_byte&>(*tag_).get();
+			case tag_type::Short:
+				return static_cast<tag_short&>(*tag_).get();
+			case tag_type::Int:
+				return static_cast<tag_int&>(*tag_).get();
+			case tag_type::Long:
+				return static_cast<tag_long&>(*tag_).get();
+			case tag_type::Float:
+				return static_cast<tag_float&>(*tag_).get();
+
+			default:
+				throw std::bad_cast();
+		}
+	}
+
+	value::operator double() const
+	{
+		switch (tag_->get_type()) {
+			case tag_type::Byte:
+				return static_cast<tag_byte&>(*tag_).get();
+			case tag_type::Short:
+				return static_cast<tag_short&>(*tag_).get();
+			case tag_type::Int:
+				return static_cast<tag_int&>(*tag_).get();
+			case tag_type::Long:
+				return static_cast<tag_long&>(*tag_).get();
+			case tag_type::Float:
+				return static_cast<tag_float&>(*tag_).get();
+			case tag_type::Double:
+				return static_cast<tag_double&>(*tag_).get();
+
+			default:
+				throw std::bad_cast();
+		}
+	}
+
+	value& value::operator=(std::string&& str)
+	{
+		if (!tag_)
+			set(tag_string(std::move(str)));
+		else
+			dynamic_cast<tag_string&>(*tag_).set(std::move(str));
+		return *this;
+	}
+
+	value::operator const std::string&() const
+	{
+		return dynamic_cast<tag_string&>(*tag_).get();
+	}
+
+	value& value::at(const std::string& key)
+	{
+		return dynamic_cast<tag_compound&>(*tag_).at(key);
+	}
+
+	const value& value::at(const std::string& key) const
+	{
+		return dynamic_cast<const tag_compound&>(*tag_).at(key);
+	}
+
+	value& value::operator[](const std::string& key)
+	{
+		return dynamic_cast<tag_compound&>(*tag_)[key];
+	}
+
+	value& value::operator[](const char* key)
+	{
+		return (*this)[std::string(key)];
+	}
+
+	value& value::at(size_t i)
+	{
+		return dynamic_cast<tag_list&>(*tag_).at(i);
+	}
+
+	const value& value::at(size_t i) const
+	{
+		return dynamic_cast<const tag_list&>(*tag_).at(i);
+	}
+
+	value& value::operator[](size_t i)
+	{
+		return dynamic_cast<tag_list&>(*tag_)[i];
+	}
+
+	const value& value::operator[](size_t i) const
+	{
+		return dynamic_cast<const tag_list&>(*tag_)[i];
+	}
+
+	tag_type value::get_type() const
+	{
+		return tag_ ? tag_->get_type() : tag_type::Null;
+	}
+
+	bool operator==(const value& lhs, const value& rhs)
+	{
+		if (lhs.tag_ != nullptr && rhs.tag_ != nullptr)
+			return *lhs.tag_ == *rhs.tag_;
+		else
+			return lhs.tag_ == nullptr && rhs.tag_ == nullptr;
+	}
+
+	bool operator!=(const value& lhs, const value& rhs)
+	{
+		return !(lhs == rhs);
+	}
+
+} // namespace nbt