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-rw-r--r--libnbtplusplus/src/value.cpp327
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diff --git a/libnbtplusplus/src/value.cpp 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
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