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/* Copyright (C) 2025 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_SCRIPTCONVERSIONS
#define INCLUDED_SCRIPTCONVERSIONS
#include "lib/code_generation.h"
#include "lib/debug.h"
#include "lib/types.h"
#include "ps/CStr.h"
#include "scriptinterface/ScriptExceptions.h"
#include "scriptinterface/ScriptRequest.h"
#include <js/Array.h>
#include <js/PropertyAndElement.h>
#include <js/RootingAPI.h>
#include <js/TypeDecls.h>
#include <js/Value.h>
#include <js/experimental/TypedData.h>
#include <limits>
#include <optional>
#include <string>
#include <utility>
#include <vector>
namespace Script
{
/**
* Convert a JS::Value to a C++ type. (This might trigger GC.)
*/
template<typename T> bool FromJSVal(const ScriptRequest& rq, const JS::HandleValue val, T& ret);
template<typename T>
bool FromJSVal(const ScriptRequest& rq, JS::HandleValue v, std::optional<T>& out)
{
if (v.isNullOrUndefined())
{
out = std::nullopt;
return true;
}
T value;
if (!FromJSVal(rq, v, value))
return false;
out = std::move(value);
return true;
}
/**
* Convert a C++ type to a JS::Value. (This might trigger GC. The return
* value must be rooted if you don't want it to be collected.)
* NOTE: We are passing the JS::Value by reference instead of returning it by value.
* The reason is a memory corruption problem that appears to be caused by a bug in Visual Studio.
* Details here: http://www.wildfiregames.com/forum/index.php?showtopic=17289&p=285921
*/
template<typename T> void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue ret, T const& val);
template<std::size_t N>
void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue ret, const char (&val)[N])
{
ToJSVal(rq, ret, static_cast<const char*>(val));
}
template<std::size_t N>
void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue ret, const wchar_t (&val)[N])
{
ToJSVal(rq, ret, static_cast<const wchar_t*>(val));
}
template<>
inline void ToJSVal<JS::PersistentRootedValue>(const ScriptRequest&, JS::MutableHandleValue handle,
const JS::PersistentRootedValue& a)
{
handle.set(a);
}
template<>
inline void ToJSVal<JS::Heap<JS::Value> >(const ScriptRequest&, JS::MutableHandleValue handle,
const JS::Heap<JS::Value>& a)
{
handle.set(a);
}
template<>
inline void ToJSVal<JS::RootedValue>(const ScriptRequest&, JS::MutableHandleValue handle,
const JS::RootedValue& a)
{
handle.set(a);
}
template <>
inline void ToJSVal<JS::HandleValue>(const ScriptRequest&, JS::MutableHandleValue handle,
const JS::HandleValue& a)
{
handle.set(a);
}
/**
* Convert a named property of an object to a C++ type.
*/
template<typename T> inline bool FromJSProperty(const ScriptRequest& rq, const JS::HandleValue val, const char* name, T& ret, bool strict = false)
{
if (!val.isObject())
return false;
JS::RootedObject obj(rq.cx, &val.toObject());
bool hasProperty;
if (!JS_HasProperty(rq.cx, obj, name, &hasProperty) || !hasProperty)
return false;
JS::RootedValue value(rq.cx);
if (!JS_GetProperty(rq.cx, obj, name, &value))
return false;
if (strict && value.isNull())
return false;
return FromJSVal(rq, value, ret);
}
template<typename T> inline void ToJSVal_vector(const ScriptRequest& rq, JS::MutableHandleValue ret, const std::vector<T>& val)
{
JS::RootedObject obj(rq.cx, JS::NewArrayObject(rq.cx, 0));
if (!obj)
{
ret.setUndefined();
return;
}
ENSURE(val.size() <= std::numeric_limits<u32>::max());
for (u32 i = 0; i < val.size(); ++i)
{
JS::RootedValue el(rq.cx);
Script::ToJSVal<T>(rq, &el, val[i]);
JS_SetElement(rq.cx, obj, i, el);
}
ret.setObject(*obj);
}
#define FAIL(msg) STMT(ScriptException::Raise(rq, msg); return false)
template<typename T> inline bool FromJSVal_vector(const ScriptRequest& rq, JS::HandleValue v, std::vector<T>& out)
{
JS::RootedObject obj(rq.cx);
if (!v.isObject())
FAIL("Argument must be an array");
bool isArray;
obj = &v.toObject();
if ((!JS::IsArrayObject(rq.cx, obj, &isArray) || !isArray) && !JS_IsTypedArrayObject(obj))
FAIL("Argument must be an array");
u32 length;
if (!JS::GetArrayLength(rq.cx, obj, &length))
FAIL("Failed to get array length");
out.clear();
out.reserve(length);
for (u32 i = 0; i < length; ++i)
{
JS::RootedValue el(rq.cx);
if (!JS_GetElement(rq.cx, obj, i, &el))
FAIL("Failed to read array element");
T el2{};
if (!Script::FromJSVal<T>(rq, el, el2))
return false;
out.push_back(el2);
}
return true;
}
#undef FAIL
#define JSVAL_VECTOR(T) \
template<> void Script::ToJSVal<std::vector<T> >(const ScriptRequest& rq, JS::MutableHandleValue ret, const std::vector<T>& val) \
{ \
ToJSVal_vector(rq, ret, val); \
} \
template<> bool Script::FromJSVal<std::vector<T> >(const ScriptRequest& rq, JS::HandleValue v, std::vector<T>& out) \
{ \
return FromJSVal_vector(rq, v, out); \
}
} // namespace Script
#endif //INCLUDED_SCRIPTCONVERSIONS
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