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reference.cpp
1 /*
2  * This file is part of the KDE libraries
3  * Copyright (C) 2003 Apple Computer, Inc
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library 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  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public License
16  * along with this library; see the file COPYING.LIB. If not, write to
17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  *
20  */
21 
22 #include "reference.h"
23 #include "internal.h"
24 #include "context.h"
25 
26 #include <assert.h>
27 
28 using namespace KJS;
29 
30 // ------------------------------ Reference ------------------------------------
31 
32 Reference::Reference(const Object& b, const Identifier& p)
33  : base(b),
34  baseIsValue(false),
35  propertyNameIsNumber(false),
36  prop(p)
37 {
38 }
39 
40 Reference::Reference(const Object& b, unsigned p)
41  : base(b),
42  propertyNameAsNumber(p),
43  baseIsValue(false),
44  propertyNameIsNumber(true)
45 {
46 }
47 
48 Reference::Reference(ObjectImp *b, const Identifier& p)
49  : base(b),
50  baseIsValue(false),
51  propertyNameIsNumber(false),
52  prop(p)
53 {
54 }
55 
56 Reference::Reference(ObjectImp *b, unsigned p)
57  : base(b),
58  propertyNameAsNumber(p),
59  baseIsValue(false),
60  propertyNameIsNumber(true)
61 {
62 }
63 
64 Reference::Reference(const Null& b, const Identifier& p)
65  : base(b),
66  baseIsValue(false),
67  propertyNameIsNumber(false),
68  prop(p)
69 {
70 }
71 
72 Reference::Reference(const Null& b, unsigned p)
73  : base(b),
74  propertyNameAsNumber(p),
75  baseIsValue(false),
76  propertyNameIsNumber(true)
77 {
78 }
79 
80 Reference Reference::makeValueReference(const Value& v)
81 {
82  Reference valueRef;
83  valueRef.base = v;
84  valueRef.baseIsValue = true;
85  return valueRef;
86 }
87 
88 Reference::Reference()
89 {
90 }
91 
92 Value Reference::getBase(ExecState *exec) const
93 {
94  if (baseIsValue) {
95  Object err = Error::create(exec, ReferenceError, I18N_NOOP("Invalid reference base"));
96  exec->setException(err);
97  return err;
98  }
99 
100  return base;
101 }
102 
103 Identifier Reference::getPropertyName(ExecState * /*exec*/) const
104 {
105  if (baseIsValue) {
106  // the spec wants a runtime error here. But getValue() and putValue()
107  // will catch this case on their own earlier. When returning a Null
108  // string we should be on the safe side.
109  return Identifier();
110  }
111 
112  if (propertyNameIsNumber && prop.isNull())
113  prop = Identifier::from(propertyNameAsNumber);
114  return prop;
115 }
116 
117 Value Reference::getValue(ExecState *exec) const
118 {
119  if (baseIsValue) {
120  return base;
121  }
122 
123  Value o = getBase(exec);
124 
125  if (!o.isValid() || o.type() == NullType) {
126  UString m = I18N_NOOP("Can't find variable: ") + getPropertyName(exec).ustring();
127  Object err = Error::create(exec, ReferenceError, m.ascii());
128  exec->setException(err);
129  return err;
130  }
131 
132  if (o.type() != ObjectType) {
133  UString m = I18N_NOOP("Base is not an object");
134  Object err = Error::create(exec, ReferenceError, m.ascii());
135  exec->setException(err);
136  return err;
137  }
138 
139  ObjectImp *oimp = static_cast<ObjectImp*>(o.imp());
140  if (propertyNameIsNumber)
141  return oimp->getPropertyByIndex(exec, propertyNameAsNumber);
142  return oimp->get(exec, prop);
143 }
144 
145 void Reference::putValue(ExecState *exec, const Value &w)
146 {
147  if (baseIsValue) {
148  Object err = Error::create(exec,ReferenceError);
149  exec->setException(err);
150  return;
151  }
152 
153 #ifdef KJS_VERBOSE
154  printInfo(exec,(UString("setting property ")+getPropertyName(exec).ustring()).cstring().c_str(),w);
155 #endif
156  Value o = getBase(exec);
157  if (o.type() == NullType)
158  o = Value(exec->context().imp()->scopeChain().bottom());
159 
160  ObjectImp *oimp = static_cast<ObjectImp*>(o.imp());
161  if (propertyNameIsNumber)
162  oimp->putPropertyByIndex(exec, propertyNameAsNumber, w);
163  else
164  oimp->put(exec, prop, w);
165 }
166 
167 bool Reference::deleteValue(ExecState *exec)
168 {
169  if (baseIsValue) {
170  Object err = Error::create(exec,ReferenceError);
171  exec->setException(err);
172  return false;
173  }
174 
175  Value b = getBase(exec);
176 
177  // The spec doesn't mention what to do if the base is null... just return true
178  if (b.type() != ObjectType) {
179  assert(b.type() == NullType);
180  return true;
181  }
182 
183  ObjectImp *bimp = static_cast<ObjectImp*>(b.imp());
184  if (propertyNameIsNumber)
185  return bimp->deletePropertyByIndex(exec, propertyNameAsNumber);
186  return bimp->deleteProperty(exec, prop);
187 }
188 
189 bool Reference::isMutable()
190 {
191  return !baseIsValue;
192 }
KJS::Value
Value objects are act as wrappers ("smart pointers") around ValueImp objects and their descendents...
Definition: value.h:167
KJS::Value::type
Type type() const
Returns the type of value.
Definition: value.h:195
KJS::Identifier::isNull
bool isNull() const
Returns the identfiers state of being unset.
Definition: identifier.h:78
KJS::Object::get
Value get(ExecState *exec, const Identifier &propertyName) const
Retrieves the specified property from the object.
Definition: object.h:663
KJS::Null
Represents an primitive Null value.
Definition: value.h:294
KJS::Error::create
static Object create(ExecState *exec, ErrorType errtype=GeneralError, const char *message=0, int lineno=-1, int sourceId=-1)
Factory method for error objects.
Definition: object.cpp:503
KJS::Reference::getPropertyName
Identifier getPropertyName(ExecState *exec) const
Performs the GetPropertyName type conversion operation on this value (ECMA 8.7)
Definition: reference.cpp:103
KJS::Object
Represents an Object.
Definition: object.h:81
KJS::Reference::getValue
Value getValue(ExecState *exec) const
Performs the GetValue type conversion operation on this value (ECMA 8.7.1)
Definition: reference.cpp:117
KJS::UString
Unicode string class.
Definition: ustring.h:189
KJS::Reference
Defines a Javascript reference.
Definition: reference.h:34
KJS
Definition: array_instance.h:27
KJS::Identifier::ustring
const UString & ustring() const
returns a UString of the identifier
Definition: identifier.h:52
KJS::ExecState::context
Context context() const
Returns the execution context associated with this execution state.
Definition: interpreter.h:470
KJS::Reference::getBase
Value getBase(ExecState *exec) const
Performs the GetBase type conversion operation on this value (ECMA 8.7)
Definition: reference.cpp:92
KJS::Reference::putValue
void putValue(ExecState *exec, const Value &w)
Performs the PutValue type conversion operation on this value (ECMA 8.7.1)
Definition: reference.cpp:145
KJS::Value::isValid
bool isValid() const
Returns whether or not this is a valid value.
Definition: value.h:181
KJS::UString::ascii
char * ascii() const
Convert the Unicode string to plain ASCII chars chopping of any higher bytes.
Definition: ustring.cpp:485
KJS::ExecState
Represents the current state of script execution.
Definition: interpreter.h:438
KJS::Identifier
Represents an Identifier for a Javascript object.
Definition: identifier.h:32

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