1/*
2 *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
3 *  Copyright (C) 2003, 2008 Apple Inc. All rights reserved.
4 *
5 *  This library is free software; you can redistribute it and/or
6 *  modify it under the terms of the GNU Lesser General Public
7 *  License as published by the Free Software Foundation; either
8 *  version 2 of the License, or (at your option) any later version.
9 *
10 *  This library is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 *  Lesser General Public License for more details.
14 *
15 *  You should have received a copy of the GNU Lesser General Public
16 *  License along with this library; if not, write to the Free Software
17 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
18 *
19 */
20
21#include "config.h"
22#include "ErrorPrototype.h"
23
24#include "Error.h"
25#include "JSFunction.h"
26#include "JSString.h"
27#include "JSStringBuilder.h"
28#include "ObjectPrototype.h"
29#include "Operations.h"
30#include "StringRecursionChecker.h"
31
32namespace JSC {
33
34ASSERT_HAS_TRIVIAL_DESTRUCTOR(ErrorPrototype);
35
36static EncodedJSValue JSC_HOST_CALL errorProtoFuncToString(ExecState*);
37
38}
39
40#include "ErrorPrototype.lut.h"
41
42namespace JSC {
43
44const ClassInfo ErrorPrototype::s_info = { "Error", &ErrorInstance::s_info, 0, ExecState::errorPrototypeTable, CREATE_METHOD_TABLE(ErrorPrototype) };
45
46/* Source for ErrorPrototype.lut.h
47@begin errorPrototypeTable
48  toString          errorProtoFuncToString         DontEnum|Function 0
49@end
50*/
51
52ErrorPrototype::ErrorPrototype(ExecState* exec, Structure* structure)
53    : ErrorInstance(exec->vm(), structure)
54{
55}
56
57void ErrorPrototype::finishCreation(ExecState* exec, JSGlobalObject*)
58{
59    Base::finishCreation(exec->vm(), "");
60    ASSERT(inherits(&s_info));
61    putDirect(exec->vm(), exec->propertyNames().name, jsNontrivialString(exec, String(ASCIILiteral("Error"))), DontEnum);
62}
63
64bool ErrorPrototype::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
65{
66    return getStaticFunctionSlot<ErrorInstance>(exec, ExecState::errorPrototypeTable(exec), jsCast<ErrorPrototype*>(cell), propertyName, slot);
67}
68
69bool ErrorPrototype::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
70{
71    return getStaticFunctionDescriptor<ErrorInstance>(exec, ExecState::errorPrototypeTable(exec), jsCast<ErrorPrototype*>(object), propertyName, descriptor);
72}
73
74// ------------------------------ Functions ---------------------------
75
76// ECMA-262 5.1, 15.11.4.4
77EncodedJSValue JSC_HOST_CALL errorProtoFuncToString(ExecState* exec)
78{
79    // 1. Let O be the this value.
80    JSValue thisValue = exec->hostThisValue();
81
82    // 2. If Type(O) is not Object, throw a TypeError exception.
83    if (!thisValue.isObject())
84        return throwVMTypeError(exec);
85    JSObject* thisObj = asObject(thisValue);
86
87    // Guard against recursion!
88    StringRecursionChecker checker(exec, thisObj);
89    if (JSValue earlyReturnValue = checker.earlyReturnValue())
90        return JSValue::encode(earlyReturnValue);
91
92    // 3. Let name be the result of calling the [[Get]] internal method of O with argument "name".
93    JSValue name = thisObj->get(exec, exec->propertyNames().name);
94    if (exec->hadException())
95        return JSValue::encode(jsUndefined());
96
97    // 4. If name is undefined, then let name be "Error"; else let name be ToString(name).
98    String nameString;
99    if (name.isUndefined())
100        nameString = ASCIILiteral("Error");
101    else {
102        nameString = name.toString(exec)->value(exec);
103        if (exec->hadException())
104            return JSValue::encode(jsUndefined());
105    }
106
107    // 5. Let msg be the result of calling the [[Get]] internal method of O with argument "message".
108    JSValue message = thisObj->get(exec, exec->propertyNames().message);
109    if (exec->hadException())
110        return JSValue::encode(jsUndefined());
111
112    // (sic)
113    // 6. If msg is undefined, then let msg be the empty String; else let msg be ToString(msg).
114    // 7. If msg is undefined, then let msg be the empty String; else let msg be ToString(msg).
115    String messageString;
116    if (message.isUndefined())
117        messageString = String();
118    else {
119        messageString = message.toString(exec)->value(exec);
120        if (exec->hadException())
121            return JSValue::encode(jsUndefined());
122    }
123
124    // 8. If name is the empty String, return msg.
125    if (!nameString.length())
126        return JSValue::encode(message.isString() ? message : jsString(exec, messageString));
127
128    // 9. If msg is the empty String, return name.
129    if (!messageString.length())
130        return JSValue::encode(name.isString() ? name : jsNontrivialString(exec, nameString));
131
132    // 10. Return the result of concatenating name, ":", a single space character, and msg.
133    return JSValue::encode(jsMakeNontrivialString(exec, nameString, ": ", messageString));
134}
135
136} // namespace JSC
137