vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
158 lines
4.5 KiB
C++
158 lines
4.5 KiB
C++
/* Copyright (C) 2021 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_SCRIPTCONVERSIONS
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#define INCLUDED_SCRIPTCONVERSIONS
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#include "ScriptRequest.h"
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#include "ScriptExceptions.h"
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#include "ScriptExtraHeaders.h" // for typed arrays
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#include <limits>
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#include <vector>
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namespace Script
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{
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/**
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* Convert a JS::Value to a C++ type. (This might trigger GC.)
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*/
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template<typename T> bool FromJSVal(const ScriptRequest& rq, const JS::HandleValue val, T& ret);
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/**
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* Convert a C++ type to a JS::Value. (This might trigger GC. The return
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* value must be rooted if you don't want it to be collected.)
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* NOTE: We are passing the JS::Value by reference instead of returning it by value.
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* The reason is a memory corruption problem that appears to be caused by a bug in Visual Studio.
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* Details here: http://www.wildfiregames.com/forum/index.php?showtopic=17289&p=285921
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*/
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template<typename T> void ToJSVal(const ScriptRequest& rq, JS::MutableHandleValue ret, T const& val);
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template<>
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inline void ToJSVal<JS::PersistentRootedValue>(const ScriptRequest& UNUSED(rq), JS::MutableHandleValue handle, const JS::PersistentRootedValue& a)
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{
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handle.set(a);
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}
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template<>
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inline void ToJSVal<JS::Heap<JS::Value> >(const ScriptRequest& UNUSED(rq), JS::MutableHandleValue handle, const JS::Heap<JS::Value>& a)
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{
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handle.set(a);
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}
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template<>
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inline void ToJSVal<JS::RootedValue>(const ScriptRequest& UNUSED(rq), JS::MutableHandleValue handle, const JS::RootedValue& a)
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{
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handle.set(a);
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}
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template <>
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inline void ToJSVal<JS::HandleValue>(const ScriptRequest& UNUSED(rq), JS::MutableHandleValue handle, const JS::HandleValue& a)
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{
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handle.set(a);
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}
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/**
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* Convert a named property of an object to a C++ type.
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*/
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template<typename T> inline bool FromJSProperty(const ScriptRequest& rq, const JS::HandleValue val, const char* name, T& ret, bool strict = false)
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{
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if (!val.isObject())
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return false;
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JS::RootedObject obj(rq.cx, &val.toObject());
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bool hasProperty;
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if (!JS_HasProperty(rq.cx, obj, name, &hasProperty) || !hasProperty)
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return false;
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JS::RootedValue value(rq.cx);
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if (!JS_GetProperty(rq.cx, obj, name, &value))
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return false;
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if (strict && value.isNull())
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return false;
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return FromJSVal(rq, value, ret);
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}
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template<typename T> inline void ToJSVal_vector(const ScriptRequest& rq, JS::MutableHandleValue ret, const std::vector<T>& val)
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{
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JS::RootedObject obj(rq.cx, JS::NewArrayObject(rq.cx, 0));
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if (!obj)
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{
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ret.setUndefined();
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return;
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}
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ENSURE(val.size() <= std::numeric_limits<u32>::max());
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for (u32 i = 0; i < val.size(); ++i)
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{
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JS::RootedValue el(rq.cx);
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Script::ToJSVal<T>(rq, &el, val[i]);
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JS_SetElement(rq.cx, obj, i, el);
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}
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ret.setObject(*obj);
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}
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#define FAIL(msg) STMT(ScriptException::Raise(rq, msg); return false)
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template<typename T> inline bool FromJSVal_vector(const ScriptRequest& rq, JS::HandleValue v, std::vector<T>& out)
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{
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JS::RootedObject obj(rq.cx);
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if (!v.isObject())
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FAIL("Argument must be an array");
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bool isArray;
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obj = &v.toObject();
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if ((!JS::IsArrayObject(rq.cx, obj, &isArray) || !isArray) && !JS_IsTypedArrayObject(obj))
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FAIL("Argument must be an array");
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u32 length;
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if (!JS::GetArrayLength(rq.cx, obj, &length))
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FAIL("Failed to get array length");
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out.clear();
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out.reserve(length);
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for (u32 i = 0; i < length; ++i)
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{
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JS::RootedValue el(rq.cx);
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if (!JS_GetElement(rq.cx, obj, i, &el))
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FAIL("Failed to read array element");
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T el2;
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if (!Script::FromJSVal<T>(rq, el, el2))
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return false;
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out.push_back(el2);
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}
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return true;
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}
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#undef FAIL
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#define JSVAL_VECTOR(T) \
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template<> void Script::ToJSVal<std::vector<T> >(const ScriptRequest& rq, JS::MutableHandleValue ret, const std::vector<T>& val) \
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{ \
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ToJSVal_vector(rq, ret, val); \
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} \
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template<> bool Script::FromJSVal<std::vector<T> >(const ScriptRequest& rq, JS::HandleValue v, std::vector<T>& out) \
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{ \
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return FromJSVal_vector(rq, v, out); \
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}
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} // namespace Script
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#endif //INCLUDED_SCRIPTCONVERSIONS
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