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error_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 "error_object.h"
28 //#include "debugger.h"
29 
30 using namespace KJS;
31 
32 // ------------------------------ ErrorInstanceImp ----------------------------
33 
34 const ClassInfo ErrorInstanceImp::info = {"Error", 0, 0, 0};
35 
36 ErrorInstanceImp::ErrorInstanceImp(ObjectImp *proto)
37  : ObjectImp(proto)
38 {
39 }
40 
41 // ------------------------------ ErrorPrototypeImp ----------------------------
42 
43 // ECMA 15.9.4
44 ErrorPrototypeImp::ErrorPrototypeImp(ExecState *exec,
45  ObjectPrototypeImp *objectProto,
46  FunctionPrototypeImp *funcProto)
47  : ObjectImp(objectProto)
48 {
49  Value protect(this);
50  setInternalValue(Undefined());
51  // The constructor will be added later in ErrorObjectImp's constructor
52 
53  put(exec, namePropertyName, String("Error"), DontEnum);
54  put(exec, messagePropertyName, String("Unknown error"), DontEnum);
55  putDirect(toStringPropertyName, new ErrorProtoFuncImp(exec,funcProto), DontEnum);
56 }
57 
58 // ------------------------------ ErrorProtoFuncImp ----------------------------
59 
60 ErrorProtoFuncImp::ErrorProtoFuncImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto)
61  : InternalFunctionImp(funcProto)
62 {
63  Value protect(this);
64  putDirect(lengthPropertyName, NumberImp::zero(), DontDelete|ReadOnly|DontEnum);
65  ident = "toString";
66 }
67 
68 bool ErrorProtoFuncImp::implementsCall() const
69 {
70  return true;
71 }
72 
73 Value ErrorProtoFuncImp::call(ExecState *exec, Object &thisObj, const List &/*args*/)
74 {
75  // toString()
76  UString s = "Error";
77 
78  Value v = thisObj.get(exec, namePropertyName);
79  if (v.type() != UndefinedType) {
80  s = v.toString(exec);
81  }
82 
83  v = thisObj.get(exec, messagePropertyName);
84  if (v.type() != UndefinedType) {
85  s += ": " + v.toString(exec); // Mozilla compatible format
86  }
87 
88  return String(s);
89 }
90 
91 // ------------------------------ ErrorObjectImp -------------------------------
92 
93 ErrorObjectImp::ErrorObjectImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto,
94  ErrorPrototypeImp *errorProto)
95  : InternalFunctionImp(funcProto)
96 {
97  Value protect(this);
98  // ECMA 15.11.3.1 Error.prototype
99  putDirect(prototypePropertyName, errorProto, DontEnum|DontDelete|ReadOnly);
100  putDirect(lengthPropertyName, NumberImp::one(), DontDelete|ReadOnly|DontEnum);
101  //putDirect(namePropertyName, String(n));
102 }
103 
104 bool ErrorObjectImp::implementsConstruct() const
105 {
106  return true;
107 }
108 
109 // ECMA 15.9.3
110 Object ErrorObjectImp::construct(ExecState *exec, const List &args)
111 {
112  Object proto = Object::dynamicCast(exec->lexicalInterpreter()->builtinErrorPrototype());
113  ObjectImp *imp = new ErrorInstanceImp(proto.imp());
114  Object obj(imp);
115 
116  if (!args.isEmpty() && args[0].type() != UndefinedType) {
117  imp->putDirect(messagePropertyName, new StringImp(args[0].toString(exec)));
118  }
119 
120  return obj;
121 }
122 
123 bool ErrorObjectImp::implementsCall() const
124 {
125  return true;
126 }
127 
128 // ECMA 15.9.2
129 Value ErrorObjectImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
130 {
131  // "Error()" gives the sames result as "new Error()"
132  return construct(exec,args);
133 }
134 
135 // ------------------------------ NativeErrorPrototypeImp ----------------------
136 
137 NativeErrorPrototypeImp::NativeErrorPrototypeImp(ExecState * /*exec*/, ErrorPrototypeImp *errorProto,
138  ErrorType et, UString name, UString message)
139  : ObjectImp(errorProto)
140 {
141  Value protect(this);
142  errType = et;
143  putDirect(namePropertyName, new StringImp(name), 0);
144  putDirect(messagePropertyName, new StringImp(message), 0);
145 }
146 
147 // ------------------------------ NativeErrorImp -------------------------------
148 
149 const ClassInfo NativeErrorImp::info = {"Function", &InternalFunctionImp::info, 0, 0};
150 
151 NativeErrorImp::NativeErrorImp(ExecState * /*exec*/, FunctionPrototypeImp *funcProto,
152  const Object &prot)
153  : InternalFunctionImp(funcProto), proto(0)
154 {
155  Value protect(this);
156  proto = static_cast<ObjectImp*>(prot.imp());
157 
158  putDirect(lengthPropertyName, NumberImp::one(), DontDelete|ReadOnly|DontEnum); // ECMA 15.11.7.5
159  putDirect(prototypePropertyName, proto, DontDelete|ReadOnly|DontEnum);
160 }
161 
162 bool NativeErrorImp::implementsConstruct() const
163 {
164  return true;
165 }
166 
167 Object NativeErrorImp::construct(ExecState *exec, const List &args)
168 {
169  ObjectImp *imp = new ErrorInstanceImp(proto);
170  Object obj(imp);
171  if (args[0].type() != UndefinedType)
172  imp->putDirect(messagePropertyName, new StringImp(args[0].toString(exec)));
173  return obj;
174 }
175 
176 bool NativeErrorImp::implementsCall() const
177 {
178  return true;
179 }
180 
181 Value NativeErrorImp::call(ExecState *exec, Object &/*thisObj*/, const List &args)
182 {
183  return construct(exec,args);
184 }
185 
186 void NativeErrorImp::mark()
187 {
188  ObjectImp::mark();
189  if (proto && !proto->marked())
190  proto->mark();
191 }
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::InternalFunctionImp
Base class for all function objects.
Definition: function.h:40
KJS::Interpreter::builtinErrorPrototype
Object builtinErrorPrototype() const
Returns the builtin "Error.prototype" object.
Definition: interpreter.cpp:258
KJS::List
Native list type.
Definition: list.h:48
KJS::List::isEmpty
bool isEmpty() const
Definition: list.h:86
KJS::Object
Represents an Object.
Definition: object.h:81
KJS::Object::get
Value get(ExecState *exec, const Identifier &propertyName) const
Retrieves the specified property from the object.
Definition: object.h:663
KJS::String
Represents an primitive String value.
Definition: value.h:340
KJS::UString
Unicode string class.
Definition: ustring.h:189
KJS::Undefined
Represents an primitive Undefined value.
Definition: value.h:269
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::type
Type type() const
Returns the type of value.
Definition: value.h:195
KJS::ClassInfo
Class Information.
Definition: object.h:58

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