osb/source/core/StarLuaConverters.hpp

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#ifndef STAR_LUA_CONVERTERS_HPP
#define STAR_LUA_CONVERTERS_HPP
#include "StarRect.hpp"
#include "StarVector.hpp"
#include "StarColor.hpp"
#include "StarPoly.hpp"
#include "StarLine.hpp"
#include "StarLua.hpp"
#include "StarVariant.hpp"
namespace Star {
template <typename T>
struct LuaConverter<LuaNullTermWrapper<T>> : LuaConverter<T> {
static LuaValue from(LuaEngine& engine, LuaNullTermWrapper<T>&& v) {
auto enforcer = engine.nullTerminate();
return LuaConverter<T>::from(engine, std::forward<T>(v));
}
static LuaValue from(LuaEngine& engine, LuaNullTermWrapper<T> const& v) {
auto enforcer = engine.nullTerminate();
return LuaConverter<T>::from(engine, v);
}
static LuaNullTermWrapper<T> to(LuaEngine& engine, LuaValue const& v) {
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auto enforcer = engine.nullTerminate();
return LuaConverter<T>::to(engine, v);
}
};
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template <typename T1, typename T2>
struct LuaConverter<pair<T1, T2>> {
static LuaValue from(LuaEngine& engine, pair<T1, T2>&& v) {
auto t = engine.createTable();
t.set(1, std::move(v.first));
t.set(2, std::move(v.second));
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return t;
}
static LuaValue from(LuaEngine& engine, pair<T1, T2> const& v) {
auto t = engine.createTable();
t.set(1, v.first);
t.set(2, v.second);
return t;
}
static Maybe<pair<T1, T2>> to(LuaEngine& engine, LuaValue const& v) {
if (auto table = engine.luaMaybeTo<LuaTable>(std::move(v))) {
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auto p1 = engine.luaMaybeTo<T1>(table->get(1));
auto p2 = engine.luaMaybeTo<T2>(table->get(2));
if (p1 && p2)
return {{p1.take(), p2.take()}};
}
return {};
}
};
template <typename T, size_t N>
struct LuaConverter<Vector<T, N>> {
static LuaValue from(LuaEngine& engine, Vector<T, N> const& v) {
return engine.createArrayTable(v);
}
static Maybe<Vector<T, N>> to(LuaEngine& engine, LuaValue const& v) {
auto table = v.ptr<LuaTable>();
if (!table)
return {};
Vector<T, N> vec;
for (size_t i = 0; i < N; ++i) {
auto v = engine.luaMaybeTo<T>(table->get(i + 1));
if (!v)
return {};
vec[i] = *v;
}
return vec;
}
};
template <typename T>
struct LuaConverter<Matrix3<T>> {
static LuaValue from(LuaEngine& engine, Matrix3<T> const& m) {
auto table = engine.createTable(3, 0);
table.set(1, m[0]);
table.set(2, m[1]);
table.set(3, m[2]);
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return table;
}
static Maybe<Matrix3<T>> to(LuaEngine& engine, LuaValue const& v) {
if (auto table = v.ptr<LuaTable>()) {
auto r1 = engine.luaMaybeTo<typename Matrix3<T>::Vec3>(table->get(1));
auto r2 = engine.luaMaybeTo<typename Matrix3<T>::Vec3>(table->get(2));
auto r3 = engine.luaMaybeTo<typename Matrix3<T>::Vec3>(table->get(3));
if (r1 && r2 && r3)
return Matrix3<T>(*r1, *r2, *r3);
}
return {};
}
};
template <typename T>
struct LuaConverter<Rect<T>> {
static LuaValue from(LuaEngine& engine, Rect<T> const& v) {
if (v.isNull())
return LuaNil;
auto t = engine.createTable();
t.set(1, v.xMin());
t.set(2, v.yMin());
t.set(3, v.xMax());
t.set(4, v.yMax());
return t;
}
static Maybe<Rect<T>> to(LuaEngine& engine, LuaValue const& v) {
if (v == LuaNil)
return Rect<T>::null();
if (auto table = v.ptr<LuaTable>()) {
auto xMin = engine.luaMaybeTo<T>(table->get(1));
auto yMin = engine.luaMaybeTo<T>(table->get(2));
auto xMax = engine.luaMaybeTo<T>(table->get(3));
auto yMax = engine.luaMaybeTo<T>(table->get(4));
if (xMin && yMin && xMax && yMax)
return Rect<T>(*xMin, *yMin, *xMax, *yMax);
}
return {};
}
};
template <typename T>
struct LuaConverter<Polygon<T>> {
static LuaValue from(LuaEngine& engine, Polygon<T> const& poly) {
return engine.createArrayTable(poly.vertexes());
}
static Maybe<Polygon<T>> to(LuaEngine& engine, LuaValue const& v) {
if (auto points = engine.luaMaybeTo<typename Polygon<T>::VertexList>(v))
return Polygon<T>(points.take());
return {};
}
};
template <typename T, size_t N>
struct LuaConverter<Line<T, N>> {
static LuaValue from(LuaEngine& engine, Line<T, N> const& line) {
auto table = engine.createTable();
table.set(1, line.min());
table.set(2, line.max());
return table;
}
static Maybe<Line<T, N>> to(LuaEngine& engine, LuaValue const& v) {
if (auto table = v.ptr<LuaTable>()) {
auto min = engine.luaMaybeTo<Vector<T, N>>(table->get(1));
auto max = engine.luaMaybeTo<Vector<T, N>>(table->get(2));
if (min && max)
return Line<T, N>(*min, *max);
}
return {};
}
};
// Sort of magical converter, tries to convert from all the types in the
// Variant in order, returning the first correct type. Types should not be
// ambiguous, or the more specific types should come first, which relies on the
// implementation of the converters.
template <typename FirstType, typename... RestTypes>
struct LuaConverter<Variant<FirstType, RestTypes...>> {
static LuaValue from(LuaEngine& engine, Variant<FirstType, RestTypes...> const& variant) {
return variant.call([&engine](auto const& a) { return luaFrom(engine, a); });
}
static LuaValue from(LuaEngine& engine, Variant<FirstType, RestTypes...>&& variant) {
return variant.call([&engine](auto& a) { return luaFrom(engine, std::move(a)); });
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}
static Maybe<Variant<FirstType, RestTypes...>> to(LuaEngine& engine, LuaValue const& v) {
return checkTypeTo<FirstType, RestTypes...>(engine, v);
}
template <typename CheckType1, typename CheckType2, typename... CheckTypeRest>
static Maybe<Variant<FirstType, RestTypes...>> checkTypeTo(LuaEngine& engine, LuaValue const& v) {
if (auto t1 = engine.luaMaybeTo<CheckType1>(v))
return t1;
else
return checkTypeTo<CheckType2, CheckTypeRest...>(engine, v);
}
template <typename Type>
static Maybe<Variant<FirstType, RestTypes...>> checkTypeTo(LuaEngine& engine, LuaValue const& v) {
return engine.luaMaybeTo<Type>(v);
}
static Maybe<Variant<FirstType, RestTypes...>> to(LuaEngine& engine, LuaValue&& v) {
return checkTypeTo<FirstType, RestTypes...>(engine, std::move(v));
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}
template <typename CheckType1, typename CheckType2, typename... CheckTypeRest>
static Maybe<Variant<FirstType, RestTypes...>> checkTypeTo(LuaEngine& engine, LuaValue&& v) {
if (auto t1 = engine.luaMaybeTo<CheckType1>(v))
return t1;
else
return checkTypeTo<CheckType2, CheckTypeRest...>(engine, std::move(v));
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}
template <typename Type>
static Maybe<Variant<FirstType, RestTypes...>> checkTypeTo(LuaEngine& engine, LuaValue&& v) {
return engine.luaMaybeTo<Type>(std::move(v));
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}
};
// Similarly to Variant converter, tries to convert from all types in order.
// An empty MVariant is converted to nil and vice versa.
template <typename... Types>
struct LuaConverter<MVariant<Types...>> {
static LuaValue from(LuaEngine& engine, MVariant<Types...> const& variant) {
LuaValue value;
variant.call([&value, &engine](auto const& a) {
value = luaFrom(engine, a);
});
return value;
}
static LuaValue from(LuaEngine& engine, MVariant<Types...>&& variant) {
LuaValue value;
variant.call([&value, &engine](auto& a) {
value = luaFrom(engine, std::move(a));
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});
return value;
}
static Maybe<MVariant<Types...>> to(LuaEngine& engine, LuaValue const& v) {
if (v == LuaNil)
return MVariant<Types...>();
return checkTypeTo<Types...>(engine, v);
}
template <typename CheckType1, typename CheckType2, typename... CheckTypeRest>
static Maybe<MVariant<Types...>> checkTypeTo(LuaEngine& engine, LuaValue const& v) {
if (auto t1 = engine.luaMaybeTo<CheckType1>(v))
return t1;
else
return checkTypeTo<CheckType2, CheckTypeRest...>(engine, v);
}
template <typename CheckType>
static Maybe<MVariant<Types...>> checkTypeTo(LuaEngine& engine, LuaValue const& v) {
return engine.luaMaybeTo<CheckType>(v);
}
static Maybe<MVariant<Types...>> to(LuaEngine& engine, LuaValue&& v) {
if (v == LuaNil)
return MVariant<Types...>();
return checkTypeTo<Types...>(engine, std::move(v));
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}
template <typename CheckType1, typename CheckType2, typename... CheckTypeRest>
static Maybe<MVariant<Types...>> checkTypeTo(LuaEngine& engine, LuaValue&& v) {
if (auto t1 = engine.luaMaybeTo<CheckType1>(v))
return t1;
else
return checkTypeTo<CheckType2, CheckTypeRest...>(engine, std::move(v));
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}
template <typename CheckType>
static Maybe<MVariant<Types...>> checkTypeTo(LuaEngine& engine, LuaValue&& v) {
return engine.luaMaybeTo<CheckType>(std::move(v));
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}
};
template <>
struct LuaConverter<Color> {
static LuaValue from(LuaEngine& engine, Color const& c);
static Maybe<Color> to(LuaEngine& engine, LuaValue const& v);
};
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template <>
struct LuaConverter<LuaCallbacks> {
static LuaValue from(LuaEngine& engine, LuaCallbacks const& c);
static Maybe<LuaCallbacks> to(LuaEngine& engine, LuaValue const& v);
};
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}
#endif