source/scriptinterface/ScriptConversions.h

   1 /* Copyright (C) 2017 Wildfire Games.
   2  * This file is part of 0 A.D.
   3  *
   4  * 0 A.D. is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * 0 A.D. is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef INCLUDED_SCRIPTCONVERSIONS
  19 #define INCLUDED_SCRIPTCONVERSIONS
  20
  21 #include "ScriptInterface.h"
  22 #include "scriptinterface/ScriptExtraHeaders.h" // for typed arrays
  23
  24 #include <limits>
  25
  26 template<typename T> static void ToJSVal_vector(JSContext* cx, JS::MutableHandleValue ret, const std::vector<T>& val)
  27 {
  28         JSAutoRequest rq(cx);
  29         JS::RootedObject obj(cx, JS_NewArrayObject(cx, 0));
  30         if (!obj)
  31         {
  32                 ret.setUndefined();
  33                 return;
  34         }
  35
  36         ENSURE(val.size() <= std::numeric_limits<u32>::max());
  37         for (u32 i = 0; i < val.size(); ++i)
  38         {
  39                 JS::RootedValue el(cx);
  40                 ScriptInterface::ToJSVal<T>(cx, &el, val[i]);
  41                 JS_SetElement(cx, obj, i, el);
  42         }
  43         ret.setObject(*obj);
  44 }
  45
  46 #define FAIL(msg) STMT(JS_ReportError(cx, msg); return false)
  47
  48 template<typename T> static bool FromJSVal_vector(JSContext* cx, JS::HandleValue v, std::vector<T>& out)
  49 {
  50         JSAutoRequest rq(cx);
  51         JS::RootedObject obj(cx);
  52         if (!v.isObject())
  53                 FAIL("Argument must be an array");
  54
  55         obj = &v.toObject();
  56         if (!(JS_IsArrayObject(cx, obj) || JS_IsTypedArrayObject(obj)))
  57                 FAIL("Argument must be an array");
  58
  59         u32 length;
  60         if (!JS_GetArrayLength(cx, obj, &length))
  61                 FAIL("Failed to get array length");
  62
  63         out.reserve(length);
  64         for (u32 i = 0; i < length; ++i)
  65         {
  66                 JS::RootedValue el(cx);
  67                 if (!JS_GetElement(cx, obj, i, &el))
  68                         FAIL("Failed to read array element");
  69                 T el2;
  70                 if (!ScriptInterface::FromJSVal<T>(cx, el, el2))
  71                         return false;
  72                 out.push_back(el2);
  73         }
  74         return true;
  75 }
  76
  77 #undef FAIL
  78
  79 #define JSVAL_VECTOR(T) \
  80 template<> void ScriptInterface::ToJSVal<std::vector<T> >(JSContext* cx, JS::MutableHandleValue ret, const std::vector<T>& val) \
  81 { \
  82         ToJSVal_vector(cx, ret, val); \
  83 } \
  84 template<> bool ScriptInterface::FromJSVal<std::vector<T> >(JSContext* cx, JS::HandleValue v, std::vector<T>& out) \
  85 { \
  86         return FromJSVal_vector(cx, v, out); \
  87 }
  88
  89 template<typename T> bool ScriptInterface::FromJSProperty(JSContext* cx, const JS::HandleValue val, const char* name, T& ret)
  90 {
  91         if (!val.isObject())
  92                 return false;
  93
  94         JSAutoRequest rq(cx);
  95         JS::RootedObject obj(cx, &val.toObject());
  96
  97         bool hasProperty;
  98         if (!JS_HasProperty(cx, obj, name, &hasProperty) || !hasProperty)
  99                 return false;
 100
 101         JS::RootedValue value(cx);
 102         if (!JS_GetProperty(cx, obj, name, &value))
 103                 return false;
 104
 105         return FromJSVal(cx, value, ret);
 106 }
 107
 108 #endif //INCLUDED_SCRIPTCONVERSIONS