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bool_object.cpp
1/*
2 * This file is part of the KDE libraries
3 * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
4 * Copyright (C) 2003 Apple Computer, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 */
21
22#include "value.h"
23#include "object.h"
24#include "types.h"
25#include "interpreter.h"
26#include "operations.h"
27#include "bool_object.h"
28#include "error_object.h"
29#include "lookup.h"
30
31#include <assert.h>
32
33using namespace KJS;
34
35// ------------------------------ BooleanInstanceImp ---------------------------
36
37const ClassInfo BooleanInstanceImp::info = {"Boolean", 0, 0, 0};
38
39BooleanInstanceImp::BooleanInstanceImp(ObjectImp *proto)
40 : ObjectImp(proto)
41{
42}
43
44// ------------------------------ BooleanPrototypeImp --------------------------
45
46// ECMA 15.6.4
47
48BooleanPrototypeImp::BooleanPrototypeImp(ExecState *exec,
49 ObjectPrototypeImp *objectProto,
50 FunctionPrototypeImp *funcProto)
51 : BooleanInstanceImp(objectProto)
52{
53 Value protect(this);
54 // The constructor will be added later by InterpreterImp::InterpreterImp()
55
56 putDirect(toStringPropertyName, new BooleanProtoFuncImp(exec,funcProto,BooleanProtoFuncImp::ToString,0,toStringPropertyName), DontEnum);
57 putDirect(valueOfPropertyName, new BooleanProtoFuncImp(exec,funcProto,BooleanProtoFuncImp::ValueOf,0,valueOfPropertyName), DontEnum);
58 setInternalValue(Boolean(false));
59}
60
61
62// ------------------------------ BooleanProtoFuncImp --------------------------
63
64BooleanProtoFuncImp::BooleanProtoFuncImp(ExecState * /*exec*/,
65 FunctionPrototypeImp *funcProto, int i, int len, const Identifier &_ident)
66 : InternalFunctionImp(funcProto), id(i)
67{
68 Value protect(this);
69 putDirect(lengthPropertyName, len, DontDelete|ReadOnly|DontEnum);
70 ident = _ident;
71}
72
73
74bool BooleanProtoFuncImp::implementsCall() const
75{
76 return true;
77}
78
79
80// ECMA 15.6.4.2 + 15.6.4.3
81Value BooleanProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &/*args*/)
82{
83 // no generic function. "this" has to be a Boolean object
84 KJS_CHECK_THIS( BooleanInstanceImp, thisObj );
85
86 // execute "toString()" or "valueOf()", respectively
87
88 Value v = thisObj.internalValue();
89 assert(v.isValid());
90
91 if (id == ToString)
92 return String(v.toString(exec));
93 return Boolean(v.toBoolean(exec)); /* TODO: optimize for bool case */
94}
95
96// ------------------------------ BooleanObjectImp -----------------------------
97
98
99BooleanObjectImp::BooleanObjectImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto,
100 BooleanPrototypeImp *booleanProto)
101 : InternalFunctionImp(funcProto)
102{
103 Value protect(this);
104 putDirect(prototypePropertyName, booleanProto, DontEnum|DontDelete|ReadOnly);
105
106 // no. of arguments for constructor
107 putDirect(lengthPropertyName, NumberImp::one(), ReadOnly|DontDelete|DontEnum);
108}
109
110
111bool BooleanObjectImp::implementsConstruct() const
112{
113 return true;
114}
115
116// ECMA 15.6.2
117Object BooleanObjectImp::construct(ExecState *exec, const List &args)
118{
119 Object obj(new BooleanInstanceImp(exec->lexicalInterpreter()->builtinBooleanPrototype().imp()));
120
121 Boolean b;
122 if (args.size() > 0)
123 b = args.begin()->dispatchToBoolean(exec);
124 else
125 b = Boolean(false);
126
127 obj.setInternalValue(b);
128
129 return obj;
130}
131
132bool BooleanObjectImp::implementsCall() const
133{
134 return true;
135}
136
137// ECMA 15.6.1
138Value BooleanObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
139{
140 if (args.isEmpty())
141 return Boolean(false);
142 else
143 return Boolean(args[0].toBoolean(exec)); /* TODO: optimize for bool case */
144}
145
KJS::Boolean
Represents an primitive Boolean value.
Definition: value.h:316
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::builtinBooleanPrototype
Object builtinBooleanPrototype() const
Returns the builtin "Boolean.prototype" object.
Definition: interpreter.cpp:233
KJS::List
Native list type.
Definition: list.h:48
KJS::List::isEmpty
bool isEmpty() const
Definition: list.h:86
KJS::List::begin
ListIterator begin() const
Definition: list.h:186
KJS::List::size
int size() const
Definition: list.h:90
KJS::Object
Represents an Object.
Definition: object.h:81
KJS::Object::internalValue
Value internalValue() const
Returns the internal value of the object.
Definition: object.h:717
KJS::String
Represents an primitive String value.
Definition: value.h:340
KJS::Value
Value objects are act as wrappers ("smart pointers") around ValueImp objects and their descendents.
Definition: value.h:167
KJS::Value::toString
UString toString(ExecState *exec) const
Performs the ToString type conversion operation on this value (ECMA 9.8)
Definition: value.h:246
KJS::Value::toBoolean
bool toBoolean(ExecState *exec) const
Performs the ToBoolean type conversion operation on this value (ECMA 9.2)
Definition: value.h:216
KJS::Value::isValid
bool isValid() const
Returns whether or not this is a valid value.
Definition: value.h:181
KJS::ClassInfo
Class Information.
Definition: object.h:58

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