1/*
2 * Copyright (C) 2003, 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "runtime_method.h"
28
29#include "JSDOMBinding.h"
30#include "JSHTMLElement.h"
31#include "JSPluginElementFunctions.h"
32#include "runtime_object.h"
33#include <runtime/Error.h>
34#include <runtime/FunctionPrototype.h>
35
36using namespace WebCore;
37
38namespace JSC {
39
40using namespace Bindings;
41
42ASSERT_CLASS_FITS_IN_CELL(RuntimeMethod);
43
44const ClassInfo RuntimeMethod::s_info = { "RuntimeMethod", &InternalFunction::s_info, 0, 0 };
45
46RuntimeMethod::RuntimeMethod(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, const Identifier& ident, Bindings::MethodList& m)
47    // Callers will need to pass in the right global object corresponding to this native object "m".
48    : InternalFunction(&exec->globalData(), globalObject, structure, ident)
49    , _methodList(new MethodList(m))
50{
51    ASSERT(inherits(&s_info));
52}
53
54JSValue RuntimeMethod::lengthGetter(ExecState*, JSValue slotBase, const Identifier&)
55{
56    RuntimeMethod* thisObj = static_cast<RuntimeMethod*>(asObject(slotBase));
57
58    // Ick!  There may be more than one method with this name.  Arbitrarily
59    // just pick the first method.  The fundamental problem here is that
60    // JavaScript doesn't have the notion of method overloading and
61    // Java does.
62    // FIXME: a better solution might be to give the maximum number of parameters
63    // of any method
64    return jsNumber(thisObj->_methodList->at(0)->numParameters());
65}
66
67bool RuntimeMethod::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
68{
69    if (propertyName == exec->propertyNames().length) {
70        slot.setCacheableCustom(this, lengthGetter);
71        return true;
72    }
73
74    return InternalFunction::getOwnPropertySlot(exec, propertyName, slot);
75}
76
77bool RuntimeMethod::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor &descriptor)
78{
79    if (propertyName == exec->propertyNames().length) {
80        PropertySlot slot;
81        slot.setCustom(this, lengthGetter);
82        descriptor.setDescriptor(slot.getValue(exec, propertyName), ReadOnly | DontDelete | DontEnum);
83        return true;
84    }
85
86    return InternalFunction::getOwnPropertyDescriptor(exec, propertyName, descriptor);
87}
88
89static EncodedJSValue JSC_HOST_CALL callRuntimeMethod(ExecState* exec)
90{
91    RuntimeMethod* method = static_cast<RuntimeMethod*>(exec->callee());
92
93    if (method->methods()->isEmpty())
94        return JSValue::encode(jsUndefined());
95
96    RefPtr<Instance> instance;
97
98    JSValue thisValue = exec->hostThisValue();
99    if (thisValue.inherits(&RuntimeObject::s_info)) {
100        RuntimeObject* runtimeObject = static_cast<RuntimeObject*>(asObject(thisValue));
101        instance = runtimeObject->getInternalInstance();
102        if (!instance)
103            return JSValue::encode(RuntimeObject::throwInvalidAccessError(exec));
104    } else {
105        // Calling a runtime object of a plugin element?
106        if (thisValue.inherits(&JSHTMLElement::s_info)) {
107            HTMLElement* element = static_cast<JSHTMLElement*>(asObject(thisValue))->impl();
108            instance = pluginInstance(element);
109        }
110        if (!instance)
111            return throwVMTypeError(exec);
112    }
113    ASSERT(instance);
114
115    instance->begin();
116    JSValue result = instance->invokeMethod(exec, method);
117    instance->end();
118    return JSValue::encode(result);
119}
120
121CallType RuntimeMethod::getCallData(CallData& callData)
122{
123    callData.native.function = callRuntimeMethod;
124    return CallTypeHost;
125}
126
127}
128