JavaScriptCore/bindings/runtime_method.cpp

/*
 * Copyright (C) 2003 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */
 
#include "context.h"
#include "internal.h"
#include "runtime_method.h"
#include "runtime_object.h"

using namespace KJS::Bindings;
using namespace KJS;

RuntimeMethodImp::RuntimeMethodImp(ExecState *exec, const Identifier &ident, Bindings::MethodList &m) : FunctionImp (exec, ident)
{
    _methodList = m;
}

RuntimeMethodImp::~RuntimeMethodImp()
{
}

ValueImp *RuntimeMethodImp::lengthGetter(ExecState *exec, const Identifier& propertyName, const PropertySlot& slot)
{
    RuntimeMethodImp *thisObj = static_cast<RuntimeMethodImp *>(slot.slotBase());

    // Ick!  There may be more than one method with this name.  Arbitrarily
    // just pick the first method.  The fundamental problem here is that 
    // JavaScript doesn't have the notion of method overloading and
    // Java does.
    // FIXME: a better solution might be to give the maximum number of parameters
    // of any method
    return Number(thisObj->_methodList.methodAt(0)->numParameters());
}

bool RuntimeMethodImp::getOwnPropertySlot(ExecState *exec, const Identifier& propertyName, PropertySlot &slot)
{
    if (propertyName == lengthPropertyName) {
        slot.setCustom(this, lengthGetter);
        return true;
    }
    
    return FunctionImp::getOwnPropertySlot(exec, propertyName, slot);
}

bool RuntimeMethodImp::implementsCall() const
{
    return true;
}

ValueImp *RuntimeMethodImp::callAsFunction(ExecState *exec, ObjectImp *thisObj, const List &args)
{
    if (_methodList.length() > 0) {
	RuntimeObjectImp *imp;
	
	// If thisObj is the DOM object for a plugin, get the corresponding
	// runtime object from the DOM object.
	if (thisObj->classInfo() != &KJS::RuntimeObjectImp::info) {
	    ValueImp *runtimeObject = thisObj->get(exec, "__apple_runtime_object");
	    imp = static_cast<RuntimeObjectImp*>(runtimeObject);
	}
	else {
	    imp = static_cast<RuntimeObjectImp*>(thisObj);
	}
        if (imp) {
            Instance *instance = imp->getInternalInstance();
            
            instance->begin();
            
            ValueImp *aValue = instance->invokeMethod(exec, _methodList, args);
            
            instance->end();
            
            return aValue;
        }
    }
    
    return Undefined();
}

CodeType RuntimeMethodImp::codeType() const
{
    return FunctionCode;
}


Completion RuntimeMethodImp::execute(ExecState *exec)
{
    return Completion(Normal, Undefined());
}