Value.h

#pragma once
 
/* <editor-fold desc="MIT License">
 
Copyright(c) 2018 Robert Osfield
 
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
</editor-fold> */
 
#include <vsg/core/Data.h>
#include <vsg/core/type_name.h>
 
#include <vsg/maths/box.h>
#include <vsg/maths/mat2.h>
#include <vsg/maths/mat3.h>
#include <vsg/maths/mat4.h>
#include <vsg/maths/quat.h>
#include <vsg/maths/sphere.h>
#include <vsg/maths/vec2.h>
#include <vsg/maths/vec3.h>
#include <vsg/maths/vec4.h>
 
#include <vsg/io/Input.h>
#include <vsg/io/Output.h>
 
#define VSG_value(N, T) \
    using N = Value<T>; \
    template<>          \
    constexpr const char* type_name<N>() noexcept { return "vsg::" #N; }
 
namespace vsg
{
    template<typename T>
    class VSG_TEMPLATE_DECLSPEC Value : public Data
    {
    public:
        using value_type = T;
 
        Value() :
            _value{} { dirty(); }
        Value(const Value& rhs, const CopyOp& copyop = {}) :
            Data(rhs, copyop), _value(rhs._value) { dirty(); }
        explicit Value(const value_type& in_value) :
            _value(in_value) { dirty(); }
 
        template<typename... Args>
        explicit Value(Args&&... args) :
            _value(std::forward<Args>(args)...) { dirty(); }
 
        template<typename... Args>
        static ref_ptr<Value> create(Args&&... args)
        {
            return ref_ptr<Value>(new Value(std::forward<Args>(args)...));
        }
 
        template<typename... Args>
        static ref_ptr<Value> create_if(bool flag, Args&&... args)
        {
            if (flag)
                return ref_ptr<Value>(new Value(std::forward<Args>(args)...));
            else
                return {};
        }
 
        ref_ptr<Object> clone(const CopyOp& copyop = {}) const override
        {
            return ref_ptr<Value>(new Value(*this, copyop));
        }
 
        size_t sizeofObject() const noexcept override { return sizeof(Value); }
        const char* className() const noexcept override { return type_name<Value>(); }
        const std::type_info& type_info() const noexcept override { return typeid(*this); }
        bool is_compatible(const std::type_info& type) const noexcept override { return typeid(Value) == type || Data::is_compatible(type); }
 
        // implementation provided by Visitor.h
        void accept(Visitor& visitor) override;
        void accept(ConstVisitor& visitor) const override;
 
        void read(Input& input) override
        {
            Data::read(input);
            if (input.version_greater_equal(0, 6, 1))
                input.read("value", _value);
            else
                input.read("Value", _value);
            dirty();
        }
 
        void write(Output& output) const override
        {
            Data::write(output);
            if (output.version_greater_equal(0, 6, 1))
                output.write("value", _value);
            else
                output.write("Value", _value);
        }
 
        size_t valueSize() const override
        {
            if constexpr (std::is_same_v<T, std::string>)
                return _value.size();
            else
                return sizeof(value_type);
        }
        size_t valueCount() const override { return 1; }
 
        bool dataAvailable() const override { return true; }
        size_t dataSize() const override { return valueSize(); }
 
        void* dataPointer() override
        {
            if constexpr (std::is_same_v<T, std::string>)
                return _value.data();
            else
                return &_value;
        }
 
        const void* dataPointer() const override
        {
            if constexpr (std::is_same_v<T, std::string>)
                return _value.data();
            else
                return &_value;
        }
 
        void* dataPointer(size_t) override { return dataPointer(); }
        const void* dataPointer(size_t) const override { return dataPointer(); }
 
        void* dataRelease() override { return nullptr; }
 
        uint32_t dimensions() const override { return 0; }
 
        uint32_t width() const override { return 1; }
        uint32_t height() const override { return 1; }
        uint32_t depth() const override { return 1; }
 
        Value& operator=(const Value& rhs)
        {
            _value = rhs._value;
 
            _copy(rhs);
 
            return *this;
        }
        Value& operator=(const value_type& rhs)
        {
            _value = rhs;
            return *this;
        }
 
        operator value_type&() { return _value; }
        operator const value_type&() const { return _value; }
 
        value_type& value() { return _value; }
        const value_type& value() const { return _value; }
 
        void set(const value_type& value) { _value = value; }
 
    protected:
        virtual ~Value() {}
 
    private:
        value_type _value;
    };
 
    template<typename T>
    void Object::setValue(const std::string& key, const T& value)
    {
        using ValueT = Value<T>;
        setObject(key, ValueT::create(value));
    }
 
    template<typename T>
    bool Object::getValue(const std::string& key, T& value) const
    {
        using ValueT = Value<T>;
        const Object* object = getObject(key);
        if (object && (typeid(*object) == typeid(ValueT)))
        {
            const ValueT* vo = static_cast<const ValueT*>(getObject(key));
            value = *vo;
            return true;
        }
        else
        {
            return false;
        }
    }

    template<typename T, typename... Args>
    T value(T defaultValue, const std::string& match, Args&&... args)
    {
        T v{defaultValue};
        ((args && args->getValue(match, v)) || ...);
        return v;
    }
 
    VSG_value(stringValue, std::string);
    VSG_value(wstringValue, std::wstring);
    VSG_value(pathValue, vsg::Path);
 
    VSG_value(boolValue, bool);
    VSG_value(intValue, int);
    VSG_value(uintValue, unsigned int);
    VSG_value(floatValue, float);
    VSG_value(doubleValue, double);
 
    VSG_value(vec2Value, vec2);
    VSG_value(vec3Value, vec3);
    VSG_value(vec4Value, vec4);
 
    VSG_value(dvec2Value, dvec2);
    VSG_value(dvec3Value, dvec3);
    VSG_value(dvec4Value, dvec4);
 
    VSG_value(bvec2Value, bvec2);
    VSG_value(bvec3Value, bvec3);
    VSG_value(bvec4Value, bvec4);
 
    VSG_value(ubvec2Value, ubvec2);
    VSG_value(ubvec3Value, ubvec3);
    VSG_value(ubvec4Value, ubvec4);
 
    VSG_value(svec2Value, svec2);
    VSG_value(svec3Value, svec3);
    VSG_value(svec4Value, svec4);
 
    VSG_value(usvec2Value, usvec2);
    VSG_value(usvec3Value, usvec3);
    VSG_value(usvec4Value, usvec4);
 
    VSG_value(ivec2Value, ivec2);
    VSG_value(ivec3Value, ivec3);
    VSG_value(ivec4Value, ivec4);
 
    VSG_value(uivec2Value, uivec2);
    VSG_value(uivec3Value, uivec3);
    VSG_value(uivec4Value, uivec4);
 
    VSG_value(mat2Value, mat2);
    VSG_value(dmat2Value, dmat2);
 
    VSG_value(mat3Value, mat3);
    VSG_value(dmat3Value, dmat3);
 
    VSG_value(mat4Value, mat4);
    VSG_value(dmat4Value, dmat4);
 
    VSG_value(quatValue, quat);
    VSG_value(dquatValue, dquat);
 
    VSG_value(sphereValue, sphere);
    VSG_value(dsphereValue, dsphere);
 
    VSG_value(boxValue, box);
    VSG_value(dboxValue, dbox);
 
} // namespace vsg