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object_object.cpp
1/*
2 * This file is part of the KDE libraries
3 * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
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 "value.h"
22#include "object.h"
23#include "types.h"
24#include "interpreter.h"
25#include "operations.h"
26#include "object_object.h"
27#include "function_object.h"
28#include "lookup.h"
29#include <stdio.h>
30#include <assert.h>
31
32using namespace KJS;
33
34// ------------------------------ ObjectPrototypeImp --------------------------------
35
36ObjectPrototypeImp::ObjectPrototypeImp(ExecState *exec,
37 FunctionPrototypeImp *funcProto)
38 : ObjectImp() // [[Prototype]] is Null()
39{
40 Value protect(this);
41 putDirect(toStringPropertyName, new ObjectProtoFuncImp(exec,funcProto,ObjectProtoFuncImp::ToString,
42 0, toStringPropertyName), DontEnum);
43 putDirect(toLocaleStringPropertyName, new ObjectProtoFuncImp(exec,funcProto,ObjectProtoFuncImp::ToLocaleString,
44 0, toLocaleStringPropertyName), DontEnum);
45 putDirect(valueOfPropertyName, new ObjectProtoFuncImp(exec,funcProto,ObjectProtoFuncImp::ValueOf,
46 0, valueOfPropertyName), DontEnum);
47 putDirect("hasOwnProperty", new ObjectProtoFuncImp(exec,funcProto,ObjectProtoFuncImp::HasOwnProperty,
48 1,"hasOwnProperty"),DontEnum);
49 putDirect("isPrototypeOf", new ObjectProtoFuncImp(exec,funcProto,ObjectProtoFuncImp::IsPrototypeOf,
50 1,"isPrototypeOf"),DontEnum);
51 putDirect("propertyIsEnumerable", new ObjectProtoFuncImp(exec,funcProto,ObjectProtoFuncImp::PropertyIsEnumerable,
52 1,"propertyIsEnumerable"),DontEnum);
53
54#ifndef KJS_PURE_ECMA // standard compliance location is the Global object
55 // see http://www.devguru.com/Technologies/ecmascript/quickref/object.html
56 put(exec, "eval",
57 Object(new GlobalFuncImp(exec, funcProto,GlobalFuncImp::Eval, 1, "eval")),
58 DontEnum);
59#endif
60}
61
62// ------------------------------ ObjectProtoFuncImp --------------------------------
63
64ObjectProtoFuncImp::ObjectProtoFuncImp(ExecState * /*exec*/,
65 FunctionPrototypeImp *funcProto,
66 int i, int len, const Identifier &_ident)
67 : InternalFunctionImp(funcProto), id(i)
68{
69 Value protect(this);
70 putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
71 ident = _ident;
72}
73
74
75bool ObjectProtoFuncImp::implementsCall() const
76{
77 return true;
78}
79
80// ECMA 15.2.4.2 + 15.2.4.3
81
82Value ObjectProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &args)
83{
84 switch (id) {
85 case ToString:
86 // fall through
87 case ToLocaleString:
88 return String("[object "+thisObj.className()+"]");
89 case ValueOf:
90 return thisObj;
91 case HasOwnProperty: {
92 // Same as hasProperty() but without checking the prototype
93 Identifier propertyName(args[0].toString(exec));
94 Value tempProto(thisObj.imp()->prototype());
95 thisObj.imp()->setPrototype(Value());
96 bool exists = thisObj.hasProperty(exec,propertyName);
97 thisObj.imp()->setPrototype(tempProto);
98 return Value(exists ? BooleanImp::staticTrue : BooleanImp::staticFalse);
99 }
100 case IsPrototypeOf: {
101 Value v = args[0];
102 for (; v.isValid() && v.isA(ObjectType); v = Object::dynamicCast(v).prototype()) {
103 if (v.imp() == thisObj.imp())
104 return Value(BooleanImp::staticTrue);
105 }
106 return Value(BooleanImp::staticFalse);
107 }
108 case PropertyIsEnumerable: {
109 Identifier propertyName(args[0].toString(exec));
110 ObjectImp *obj = static_cast<ObjectImp*>(thisObj.imp());
111
112 int attributes;
113 ValueImp *v = obj->_prop.get(propertyName,attributes);
114 if (v)
115 return Value((attributes & DontEnum) ?
116 BooleanImp::staticFalse : BooleanImp::staticTrue);
117
118 if (propertyName == specialPrototypePropertyName)
119 return Value(BooleanImp::staticFalse);
120
121 const HashEntry *entry = obj->findPropertyHashEntry(propertyName);
122 return Value((entry && !(entry->attr & DontEnum)) ?
123 BooleanImp::staticTrue : BooleanImp::staticFalse);
124 }
125 }
126
127 return Undefined();
128}
129
130// ------------------------------ ObjectObjectImp --------------------------------
131
132ObjectObjectImp::ObjectObjectImp(ExecState * /*exec*/,
133 ObjectPrototypeImp *objProto,
134 FunctionPrototypeImp *funcProto)
135 : InternalFunctionImp(funcProto)
136{
137 Value protect(this);
138 // ECMA 15.2.3.1
139 putDirect(prototypePropertyName, objProto, DontEnum|DontDelete|ReadOnly);
140
141 // no. of arguments for constructor
142 putDirect(lengthPropertyName, NumberImp::one(), ReadOnly|DontDelete|DontEnum);
143}
144
145
146bool ObjectObjectImp::implementsConstruct() const
147{
148 return true;
149}
150
151// ECMA 15.2.2
152Object ObjectObjectImp::construct(ExecState *exec, const List &args)
153{
154 // if no arguments have been passed ...
155 if (args.isEmpty()) {
156 Object proto = exec->lexicalInterpreter()->builtinObjectPrototype();
157 Object result(new ObjectImp(proto));
158 return result;
159 }
160
161 Value arg = *(args.begin());
162 Object obj = Object::dynamicCast(arg);
163 if (obj.isValid())
164 return obj;
165
166 switch (arg.type()) {
167 case StringType:
168 case BooleanType:
169 case NumberType:
170 return arg.toObject(exec);
171 default:
172 assert(!"unhandled switch case in ObjectConstructor");
173 case NullType:
174 case UndefinedType:
175 Object proto = exec->lexicalInterpreter()->builtinObjectPrototype();
176 return Object(new ObjectImp(proto));
177 }
178}
179
180bool ObjectObjectImp::implementsCall() const
181{
182 return true;
183}
184
185Value ObjectObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
186{
187 Value result;
188
189 List argList;
190 // Construct a new Object
191 if (args.isEmpty()) {
192 result = construct(exec,argList);
193 } else {
194 Value arg = args[0];
195 if (arg.type() == NullType || arg.type() == UndefinedType) {
196 argList.append(arg);
197 result = construct(exec,argList);
198 } else
199 result = arg.toObject(exec);
200 }
201 return result;
202}
203
KJS::ExecState
Represents the current state of script execution.
Definition: interpreter.h:438
KJS::ExecState::lexicalInterpreter
Interpreter * lexicalInterpreter() const
Returns the interpreter associated with the current scope's global object.
Definition: interpreter.cpp:394
KJS::FunctionPrototypeImp
The initial value of Function.prototype (and thus all objects created with the Function constructor)
Definition: function_object.h:34
KJS::Identifier
Represents an Identifier for a Javascript object.
Definition: identifier.h:32
KJS::InternalFunctionImp
Base class for all function objects.
Definition: function.h:40
KJS::Interpreter::builtinObjectPrototype
Object builtinObjectPrototype() const
Returns the builtin "Object.prototype" object.
Definition: interpreter.cpp:218
KJS::List
Native list type.
Definition: list.h:48
KJS::List::append
void append(const Value &val)
Append an object to the end of the list.
Definition: list.h:66
KJS::List::isEmpty
bool isEmpty() const
Definition: list.h:86
KJS::List::begin
ListIterator begin() const
Definition: list.h:186
KJS::Object
Represents an Object.
Definition: object.h:81
KJS::Object::hasProperty
bool hasProperty(ExecState *exec, const Identifier &propertyName) const
Checks to see whether the object (or any object in it's prototype chain) has a property with the spec...
Definition: object.h:678
KJS::Object::className
UString className() const
Returns the class name of the object.
Definition: object.h:660
KJS::String
Represents an primitive String value.
Definition: value.h:340
KJS::Undefined
Represents an primitive Undefined value.
Definition: value.h:269
KJS::ValueImp
ValueImp is the base type for all primitives (Undefined, Null, Boolean, String, Number) and objects i...
Definition: value.h:78
KJS::Value
Value objects are act as wrappers ("smart pointers") around ValueImp objects and their descendents.
Definition: value.h:167
KJS::Value::isA
bool isA(Type t) const
Checks whether or not the value is of a particular tpye.
Definition: value.h:203
KJS::Value::toObject
Object toObject(ExecState *exec) const
Performs the ToObject type conversion operation on this value (ECMA 9.9)
Definition: object.h:358
KJS::Value::isValid
bool isValid() const
Returns whether or not this is a valid value.
Definition: value.h:181
KJS::Value::type
Type type() const
Returns the type of value.
Definition: value.h:195
KJS::HashEntry
An entry in a hash table.
Definition: lookup.h:36
KJS::HashEntry::attr
unsigned char attr
attr is a set for flags (e.g.
Definition: lookup.h:48

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