JavaScriptCore/bindings/c/c_instance.cpp

/*
 * Copyright (C) 2003, 2006 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
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "c_instance.h"

#include "c_class.h"
#include "c_runtime.h"
#include "c_utility.h"
#include "list.h"
#include "npruntime_impl.h"
#include <kxmlcore/Vector.h>

namespace KJS {
namespace Bindings {

CInstance::CInstance(NPObject* o) 
{
    _object = _NPN_RetainObject(o);
    _class = 0;
    setExecutionContext(0);
}

CInstance::~CInstance() 
{
    _NPN_ReleaseObject(_object);
}

CInstance::CInstance(const CInstance &other) : Instance()
{
    _object = _NPN_RetainObject(other._object);
    _class = 0;
    setExecutionContext(other.executionContext());
}

CInstance &CInstance::operator=(const CInstance& other)
{
    if (this == &other)
        return *this;

    NPObject* _oldObject = _object;
    _object = _NPN_RetainObject(other._object);
    _NPN_ReleaseObject(_oldObject);
    _class = 0;

    return *this;
}

Class *CInstance::getClass() const
{
    if (!_class)
        _class = CClass::classForIsA(_object->_class);
    return _class;
}

void CInstance::begin()
{
    // Do nothing.
}

void CInstance::end()
{
    // Do nothing.
}

bool CInstance::implementsCall() const
{
    return (_object->_class->invokeDefault != 0);
}

JSValue* CInstance::invokeMethod(ExecState* exec, const MethodList& methodList, const List& args)
{
    // Overloading methods are not allowed by NPObjects.  Should only be one
    // name match for a particular method.
    assert(methodList.length() == 1);

    CMethod* method = static_cast<CMethod*>(methodList.methodAt(0));

    NPIdentifier ident = _NPN_GetStringIdentifier(method->name());
    if (!_object->_class->hasMethod(_object, ident))
        return jsUndefined();

    unsigned count = args.size();
    Vector<NPVariant, 128> cArgs(count);

    unsigned i;
    for (i = 0; i < count; i++)
        convertValueToNPVariant(exec, args.at(i), &cArgs[i]);

    // Invoke the 'C' method.
    NPVariant resultVariant;
    VOID_TO_NPVARIANT(resultVariant);
    _object->_class->invoke(_object, ident, cArgs, count, &resultVariant);

    for (i = 0; i < count; i++)
        _NPN_ReleaseVariantValue(&cArgs[i]);

    JSValue* resultValue = convertNPVariantToValue(exec, &resultVariant);
    _NPN_ReleaseVariantValue(&resultVariant);
    return resultValue;
}


JSValue* CInstance::invokeDefaultMethod(ExecState* exec, const List& args)
{
    if (!_object->_class->invokeDefault)
        return jsUndefined();

    unsigned count = args.size();
    Vector<NPVariant, 128> cArgs(count);

    unsigned i;
    for (i = 0; i < count; i++)
        convertValueToNPVariant(exec, args.at(i), &cArgs[i]);

    // Invoke the 'C' method.
    NPVariant resultVariant;
    VOID_TO_NPVARIANT(resultVariant);
    _object->_class->invokeDefault(_object, cArgs, count, &resultVariant);

    for (i = 0; i < count; i++)
        _NPN_ReleaseVariantValue(&cArgs[i]);

    JSValue* resultValue = convertNPVariantToValue(exec, &resultVariant);
    _NPN_ReleaseVariantValue(&resultVariant);
    return resultValue;
}


JSValue* CInstance::defaultValue(JSType hint) const
{
    if (hint == StringType)
        return stringValue();
    if (hint == NumberType)
        return numberValue();
   if (hint == BooleanType)
        return booleanValue();
    return valueOf();
}

JSValue* CInstance::stringValue() const
{
    char buf[1024];
    snprintf(buf, sizeof(buf), "NPObject %p, NPClass %p", _object, _object->_class);
    return jsString(buf);
}

JSValue* CInstance::numberValue() const
{
    // FIXME: Implement something sensible.
    return jsNumber(0);
}

JSValue* CInstance::booleanValue() const
{
    // FIXME: Implement something sensible.
    return jsBoolean(false);
}

JSValue* CInstance::valueOf() const 
{
    return stringValue();
}

}
}