mirror of https://github.com/odrling/Aegisub
158 lines
4.3 KiB
C++
158 lines
4.3 KiB
C++
/**********************************************
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License: BSD
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Project Webpage: http://cajun-jsonapi.sourceforge.net/
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Author: Terry Caton
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***********************************************/
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#include "libaegisub/cajun/elements.h"
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#include "libaegisub/cajun/visitor.h"
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#include <utility>
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namespace {
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using namespace json;
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class CastVisitorBase : public Visitor, public ConstVisitor {
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void Visit(Array&) { }
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void Visit(Object&) { }
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void Visit(Integer&) { }
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void Visit(Double&) { }
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void Visit(String&) { }
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void Visit(Boolean&) { }
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void Visit(Null&) { is_null = true; }
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void Visit(Array const&) { }
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void Visit(Object const&) { }
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void Visit(Integer) { }
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void Visit(Double) { }
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void Visit(String const&) { }
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void Visit(Boolean) { }
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void Visit(Null const&) { is_null = true; }
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public:
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bool is_null = false;
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};
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template<class T>
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struct CastVisitor final : public CastVisitorBase {
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T *element = nullptr;
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void Visit(T& ele) { element = &ele; }
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};
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}
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namespace json
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{
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/////////////////////////
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// UnknownElement members
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class UnknownElement::Imp
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{
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public:
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virtual ~Imp() {}
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virtual Imp* Clone() const = 0;
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virtual bool Compare(const Imp& imp) const = 0;
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virtual void Accept(ConstVisitor& visitor) const = 0;
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virtual void Accept(Visitor& visitor) = 0;
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};
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template <typename ElementTypeT>
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class UnknownElement::Imp_T final : public UnknownElement::Imp
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{
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public:
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Imp_T(const ElementTypeT& element) : m_Element(element) { }
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Imp* Clone() const { return new Imp_T<ElementTypeT>(*this); }
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void Accept(ConstVisitor& visitor) const { visitor.Visit(m_Element); }
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void Accept(Visitor& visitor) { visitor.Visit(m_Element); }
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bool Compare(const Imp& imp) const
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{
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CastVisitor<const ElementTypeT> castVisitor;
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imp.Accept(castVisitor);
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return castVisitor.element && m_Element == *castVisitor.element;
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}
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private:
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ElementTypeT m_Element;
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};
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UnknownElement::UnknownElement() : m_pImp(new Imp_T<Null>(Null())) {}
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UnknownElement::UnknownElement(const UnknownElement& unknown) : m_pImp(unknown.m_pImp->Clone()) {}
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UnknownElement::UnknownElement(int number) : m_pImp(new Imp_T<Integer>(number)) {}
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UnknownElement::UnknownElement(const char *string) : m_pImp(new Imp_T<String>(string)) {}
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UnknownElement::~UnknownElement() { }
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#define DEFINE_UE_TYPE(Type) \
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UnknownElement::UnknownElement(Type const& val) : m_pImp(new Imp_T<Type>(val)) { } \
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UnknownElement::operator Type const&() const { return CastTo<Type>(); } \
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UnknownElement::operator Type&() { return CastTo<Type>(); }
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DEFINE_UE_TYPE(Object)
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DEFINE_UE_TYPE(Array)
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DEFINE_UE_TYPE(Integer)
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DEFINE_UE_TYPE(Double)
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DEFINE_UE_TYPE(Boolean)
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DEFINE_UE_TYPE(String)
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DEFINE_UE_TYPE(Null)
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UnknownElement& UnknownElement::operator =(const UnknownElement& unknown)
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{
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m_pImp.reset(unknown.m_pImp->Clone());
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return *this;
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}
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UnknownElement& UnknownElement::operator[](const std::string& key)
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{
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return CastTo<Object>()[key];
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}
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const UnknownElement& UnknownElement::operator[] (const std::string& key) const
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{
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// throws if we aren't an object
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Object const& obj = CastTo<Object>();
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Object::const_iterator it = obj.find(key);
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if (it == obj.end())
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throw Exception("Object member not found: " + key);
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return it->second;
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}
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template <typename ElementTypeT>
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ElementTypeT const& UnknownElement::CastTo() const
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{
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CastVisitor<const ElementTypeT> castVisitor;
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Accept(castVisitor);
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if (!castVisitor.element)
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throw Exception("Bad cast");
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return *castVisitor.element;
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}
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template <typename ElementTypeT>
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ElementTypeT& UnknownElement::CastTo()
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{
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CastVisitor<ElementTypeT> castVisitor;
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Accept(castVisitor);
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// If this element is uninitialized, implicitly convert it to the desired type
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if (castVisitor.is_null) {
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*this = ElementTypeT();
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return *this;
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}
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// Otherwise throw an exception
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if (!castVisitor.element)
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throw Exception("Bad cast");
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return *castVisitor.element;
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}
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void UnknownElement::Accept(ConstVisitor& visitor) const { m_pImp->Accept(visitor); }
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void UnknownElement::Accept(Visitor& visitor) { m_pImp->Accept(visitor); }
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bool UnknownElement::operator == (const UnknownElement& element) const
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{
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return m_pImp->Compare(*element.m_pImp);
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}
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} // end namespace
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