qt/api/qscriptfunction.cpp

   1 /*
   2     Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License as published by the Free Software Foundation; either
   7     version 2 of the License, or (at your option) any later version.
   8
   9     This library 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 GNU
  12     Library General Public License for more details.
  13
  14     You should have received a copy of the GNU Library General Public License
  15     along with this library; see the file COPYING.LIB.  If not, write to
  16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17     Boston, MA 02110-1301, USA.
  18 */
  19
  20 // Contains the necessary helper structures to make possible expose
  21 // C/C++ functions to JavaScript environment.
  22
  23 #include "config.h"
  24
  25 #include "qscriptfunction_p.h"
  26
  27 static void qt_NativeFunction_finalize(JSObjectRef object)
  28 {
  29     void* priv = JSObjectGetPrivate(object);
  30     delete reinterpret_cast<QNativeFunctionData*>(priv);
  31 }
  32
  33 static JSValueRef qt_NativeFunction_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
  34 {
  35     QNativeFunctionData* data = reinterpret_cast<QNativeFunctionData*>(JSObjectGetPrivate(object));
  36
  37     // TODO: build a QScriptContext and use it in the native call.
  38     QScriptContext* scriptContext = 0;
  39     Q_UNUSED(context);
  40     Q_UNUSED(thisObject);
  41     Q_UNUSED(argumentCount);
  42     Q_UNUSED(arguments);
  43     Q_UNUSED(exception);
  44
  45     QScriptEnginePrivate* engine = data->engine;
  46     QScriptValuePrivate* result = QScriptValuePrivate::get(data->fun(scriptContext, QScriptEnginePrivate::get(engine)));
  47     if (!result->isValid()) {
  48         qWarning("Invalid value returned from native function, returning undefined value instead.");
  49         return engine->makeJSValue(QScriptValue::UndefinedValue);
  50     }
  51
  52     // Make sure that the result will be assigned to the correct engine.
  53     if (!result->engine()) {
  54         Q_ASSERT(result->isValid());
  55         result->assignEngine(engine);
  56     } else if (result->engine() != engine) {
  57         qWarning("Value from different engine returned from native function, returning undefined value instead.");
  58         return engine->makeJSValue(QScriptValue::UndefinedValue);
  59     }
  60
  61     return *result;
  62 }
  63
  64 JSClassDefinition qt_NativeFunctionClass = {
  65     0,                                     // version
  66     kJSClassAttributeNoAutomaticPrototype, // attributes
  67
  68     "",                         // className
  69     0,                          // parentClass
  70
  71     0,                          // staticValues
  72     0,                          // staticFunctions
  73
  74     0,                                // initialize
  75     qt_NativeFunction_finalize,       // finalize
  76     0,                                // hasProperty
  77     0,                                // getProperty
  78     0,                                // setProperty
  79     0,                                // deleteProperty
  80     0,                                // getPropertyNames
  81     qt_NativeFunction_callAsFunction, // callAsFunction
  82     0,                                // callAsConstructor
  83     0,                                // hasInstance
  84     0                                 // convertToType
  85 };
  86
  87 static void qt_NativeFunctionWithArg_finalize(JSObjectRef object)
  88 {
  89     void* priv = JSObjectGetPrivate(object);
  90     delete reinterpret_cast<QNativeFunctionWithArgData*>(priv);
  91 }
  92
  93 static JSValueRef qt_NativeFunctionWithArg_callAsFunction(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
  94 {
  95     QNativeFunctionWithArgData* data = reinterpret_cast<QNativeFunctionWithArgData*>(JSObjectGetPrivate(object));
  96
  97     // TODO: build a QScriptContext and use it in the native call.
  98     QScriptContext* scriptContext = 0;
  99     Q_UNUSED(context);
 100     Q_UNUSED(thisObject);
 101     Q_UNUSED(argumentCount);
 102     Q_UNUSED(arguments);
 103     Q_UNUSED(exception);
 104
 105     QScriptEnginePrivate* engine = data->engine;
 106     QScriptValuePrivate* result = QScriptValuePrivate::get(data->fun(scriptContext, QScriptEnginePrivate::get(engine), data->arg));
 107     if (!result->isValid()) {
 108         qWarning("Invalid value returned from native function, returning undefined value instead.");
 109         return engine->makeJSValue(QScriptValue::UndefinedValue);
 110     }
 111
 112     // Make sure that the result will be assigned to the correct engine.
 113     if (!result->engine()) {
 114         Q_ASSERT(result->isValid());
 115         result->assignEngine(engine);
 116     } else if (result->engine() != engine) {
 117         qWarning("Value from different engine returned from native function, returning undefined value instead.");
 118         return engine->makeJSValue(QScriptValue::UndefinedValue);
 119     }
 120
 121     return *result;
 122 }
 123
 124 JSClassDefinition qt_NativeFunctionWithArgClass = {
 125     0,                                     // version
 126     kJSClassAttributeNoAutomaticPrototype, // attributes
 127
 128     "",                         // className
 129     0,                          // parentClass
 130
 131     0,                          // staticValues
 132     0,                          // staticFunctions
 133
 134     0,                                       // initialize
 135     qt_NativeFunctionWithArg_finalize,       // finalize
 136     0,                                       // hasProperty
 137     0,                                       // getProperty
 138     0,                                       // setProperty
 139     0,                                       // deleteProperty
 140     0,                                       // getPropertyNames
 141     qt_NativeFunctionWithArg_callAsFunction, // callAsFunction
 142     0,                                       // callAsConstructor
 143     0,                                       // hasInstance
 144     0                                        // convertToType
 145 };