author | Claus Gittinger <cg@exept.de> |
Wed, 23 Aug 2006 16:07:03 +0200 | |
changeset 9658 | d5f394a41fb4 |
parent 9641 | 3569174a721e |
child 10015 | 2c0c649c4bc6 |
permissions | -rw-r--r-- |
1 | 1 |
" |
5 | 2 |
COPYRIGHT (c) 1988 by Claus Gittinger |
159 | 3 |
All Rights Reserved |
1 | 4 |
|
5 |
This software is furnished under a license and may be used |
|
6 |
only in accordance with the terms of that license and with the |
|
7 |
inclusion of the above copyright notice. This software may not |
|
8 |
be provided or otherwise made available to, or used by, any |
|
9 |
other person. No title to or ownership of the software is |
|
10 |
hereby transferred. |
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11 |
" |
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||
5471
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General encoding method (#encodeOn:with:)
Stefan Vogel <sv@exept.de>
parents:
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"{ Package: 'stx:libbasic' }" |
a57eeb01c5ab
General encoding method (#encodeOn:with:)
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parents:
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|
1 | 15 |
Object subclass:#UndefinedObject |
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instanceVariableNames:'' |
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parents:
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17 |
classVariableNames:'CreateMinimumProtocolInNewSubclassQuery' |
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parents:
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poolDictionaries:'' |
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category:'Kernel-Objects' |
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! |
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||
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!UndefinedObject class methodsFor:'documentation'! |
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copyright |
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25 |
" |
|
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COPYRIGHT (c) 1988 by Claus Gittinger |
|
159 | 27 |
All Rights Reserved |
1 | 28 |
|
88 | 29 |
This software is furnished under a license and may be used |
30 |
only in accordance with the terms of that license and with the |
|
31 |
inclusion of the above copyright notice. This software may not |
|
32 |
be provided or otherwise made available to, or used by, any |
|
33 |
other person. No title to or ownership of the software is |
|
34 |
hereby transferred. |
|
35 |
" |
|
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! |
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||
38 |
documentation |
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" |
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1303 | 40 |
there is only one instance of this class: nil, |
41 |
representing an undefined or otherwise unspecified object. |
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88 | 42 |
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All instance variables, array elements and even method/block local |
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variables are initially set to nil. |
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1303 | 45 |
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parents:
1958
diff
changeset
|
46 |
Since in Smalltalk/X (and in other smalltalks), nil is represented by |
8ba8b1002902
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parents:
1958
diff
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|
47 |
a special pointer value (NULL), there can be only one instance of UndefinedObject, |
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
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|
48 |
and no subclassing is possible. |
1303 | 49 |
(to be exact: subclassing UndefinedObject is technically possible, |
50 |
but instances of it would not be recognized as being nil |
|
51 |
- therefore, subclassing is blocked and an error is raised when it is tried) |
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||
53 |
For advanced users: |
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Beside the above role, nil can be subclassed (!!). |
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This creates a class which inherits no protocol whatsoever - not even |
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the basic interfaces as defined by the Object class. Subclasses of nil |
|
57 |
are useful if all messages send to instances should trap into the |
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#doesNotUnderstand: method. For example, proxy objects are typically defined |
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this way. |
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1294 | 60 |
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[author:] |
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Claus Gittinger |
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88 | 63 |
" |
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! ! |
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1 | 65 |
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2040
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parents:
1958
diff
changeset
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66 |
!UndefinedObject class methodsFor:'initialization'! |
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parents:
1958
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67 |
|
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parents:
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68 |
initialize |
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|
69 |
CreateMinimumProtocolInNewSubclassQuery isNil ifTrue:[ |
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parents:
1958
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70 |
CreateMinimumProtocolInNewSubclassQuery := QuerySignal new. |
8ba8b1002902
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parents:
1958
diff
changeset
|
71 |
CreateMinimumProtocolInNewSubclassQuery nameClass:self message:#createMinimumProtocolInNewSubclassQuery. |
8ba8b1002902
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parents:
1958
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|
72 |
CreateMinimumProtocolInNewSubclassQuery defaultAnswer:false. |
8ba8b1002902
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parents:
1958
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73 |
]. |
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parents:
1958
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|
74 |
|
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
changeset
|
75 |
" |
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
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|
76 |
UndefinedObject initialize |
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
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|
77 |
" |
8ba8b1002902
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parents:
1958
diff
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|
78 |
|
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
changeset
|
79 |
"Created: 3.1.1997 / 15:02:40 / cg" |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
80 |
"Modified: 3.1.1997 / 15:18:33 / cg" |
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
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|
81 |
! ! |
8ba8b1002902
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parents:
1958
diff
changeset
|
82 |
|
1 | 83 |
!UndefinedObject class methodsFor:'instance creation'! |
84 |
||
85 |
basicNew |
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86 |
"catch new - there MUST be only one nil in the system" |
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87 |
||
88 |
^ nil |
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89 |
! |
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90 |
||
91 |
basicNew:size |
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92 |
"catch new - there MUST be only one nil in the system" |
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93 |
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94 |
^ nil |
|
95 |
! ! |
|
96 |
||
2040
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
changeset
|
97 |
!UndefinedObject class methodsFor:'Signal constants'! |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
98 |
|
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
changeset
|
99 |
createMinimumProtocolInNewSubclassQuery |
8ba8b1002902
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parents:
1958
diff
changeset
|
100 |
"return the signal used to ask if the minimum required protocol |
8ba8b1002902
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parents:
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|
101 |
should be created for nil subclasses. |
8ba8b1002902
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parents:
1958
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102 |
By default, this is not done, however, the browser answers true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
103 |
here, to avoid big trouble with nil subclasses which do not define |
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
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|
104 |
some methods which the inspector needs." |
8ba8b1002902
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parents:
1958
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|
105 |
|
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parents:
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|
106 |
^ CreateMinimumProtocolInNewSubclassQuery |
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parents:
1958
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|
107 |
|
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parents:
1958
diff
changeset
|
108 |
"Created: 3.1.1997 / 15:05:48 / cg" |
8ba8b1002902
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parents:
1958
diff
changeset
|
109 |
"Modified: 3.1.1997 / 15:06:15 / cg" |
8ba8b1002902
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parents:
1958
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110 |
! ! |
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parents:
1958
diff
changeset
|
111 |
|
51 | 112 |
!UndefinedObject class methodsFor:'queries'! |
113 |
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114 |
canBeSubclassed |
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115 |
"return true, if its allowed to create subclasses of the receiver. |
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3914 | 116 |
Return false here - since it is NOT possible for UndefinedObject. |
117 |
(due to the representation of nil as a 0-pointer)" |
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51 | 118 |
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119 |
^ false |
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3914 | 120 |
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121 |
"Modified: / 5.11.1998 / 16:11:43 / cg" |
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122 |
! |
dc3662188b2c
added #hasImmediateInstances for VW compatibility
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parents:
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diff
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|
123 |
|
dc3662188b2c
added #hasImmediateInstances for VW compatibility
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diff
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124 |
hasImmediateInstances |
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125 |
"return true if this class has immediate instances |
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126 |
i.e. if the instances are represented in the pointer itself and |
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127 |
no real object header/storage is used for the object. |
2672
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parents:
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|
128 |
Redefined from Behavior" |
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|
129 |
|
dc3662188b2c
added #hasImmediateInstances for VW compatibility
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130 |
^ true |
dc3662188b2c
added #hasImmediateInstances for VW compatibility
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parents:
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diff
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|
131 |
|
dc3662188b2c
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parents:
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132 |
"Created: 3.6.1997 / 12:01:39 / cg" |
4321 | 133 |
! |
134 |
||
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135 |
hasSharedInstances |
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|
136 |
"return true if this class has shared instances, that is, instances |
8b3118a923d1
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parents:
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|
137 |
with the same value are identical. |
4654 | 138 |
True returned here - there is only one nil." |
4652
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parents:
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diff
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|
139 |
|
8b3118a923d1
added #hasSharedInstances & tracing support
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parents:
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diff
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|
140 |
^ true |
8b3118a923d1
added #hasSharedInstances & tracing support
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parents:
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diff
changeset
|
141 |
|
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
142 |
|
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
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diff
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|
143 |
! |
8b3118a923d1
added #hasSharedInstances & tracing support
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parents:
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diff
changeset
|
144 |
|
4321 | 145 |
isBuiltInClass |
146 |
"return true, if this class is known by the run-time-system, |
|
147 |
i.e. you cannot add/remove instance variables without recompiling |
|
148 |
the VM. |
|
149 |
Here, true is returned for myself, false for subclasses." |
|
150 |
||
151 |
^ self == UndefinedObject |
|
152 |
||
51 | 153 |
! ! |
154 |
||
5699 | 155 |
|
2416 | 156 |
!UndefinedObject methodsFor:'converting'! |
157 |
||
8305 | 158 |
asBoolean |
159 |
^ false |
|
160 |
! |
|
161 |
||
2416 | 162 |
literalArrayEncoding |
163 |
"encode myself as an array literal, from which a copy of the receiver |
|
164 |
can be reconstructed with #decodeAsLiteralArray." |
|
165 |
||
166 |
^ self |
|
167 |
||
168 |
"Created: 25.2.1997 / 19:18:47 / cg" |
|
169 |
! ! |
|
170 |
||
695 | 171 |
!UndefinedObject methodsFor:'copying'! |
172 |
||
173 |
copy |
|
174 |
"return a shallow copy of myself |
|
175 |
- since there is only one nil in the system return self" |
|
176 |
||
177 |
^ self |
|
178 |
! |
|
179 |
||
180 |
deepCopy |
|
181 |
"return a deep copy of myself |
|
182 |
- since there is only one nil in the system return self" |
|
183 |
||
184 |
^ self |
|
185 |
! |
|
186 |
||
187 |
deepCopyUsing:aDictionary |
|
188 |
"return a deep copy of myself |
|
8383 | 189 |
- since there is only one nil in the system, return self" |
695 | 190 |
|
191 |
^ self |
|
192 |
! |
|
193 |
||
194 |
shallowCopy |
|
195 |
"return a shallow copy of myself |
|
196 |
- since there is only one nil in the system return self" |
|
197 |
||
198 |
^ self |
|
199 |
! |
|
200 |
||
201 |
simpleDeepCopy |
|
202 |
"return a deep copy of myself |
|
203 |
- since there is only one nil in the system return self" |
|
204 |
||
205 |
^ self |
|
206 |
! ! |
|
207 |
||
3166 | 208 |
!UndefinedObject methodsFor:'dependents access'! |
209 |
||
210 |
addDependent:someObject |
|
211 |
"raise an error here - nil may not have dependents" |
|
212 |
||
4530
793b116fef3e
error: vs. error:mayProceed:
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|
213 |
self error:'nil may not have dependents' mayProceed:true |
793b116fef3e
error: vs. error:mayProceed:
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parents:
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diff
changeset
|
214 |
|
3166 | 215 |
! |
216 |
||
3183 | 217 |
dependents |
218 |
"nil has no dependents" |
|
219 |
||
220 |
^#() |
|
221 |
! |
|
222 |
||
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
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parents:
3183
diff
changeset
|
223 |
release |
3166 | 224 |
"ignored here - nil has no dependents" |
3183 | 225 |
! |
3166 | 226 |
|
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
227 |
removeDependent:someObject |
3183 | 228 |
"ignored here - nil has no dependents" |
3166 | 229 |
! ! |
230 |
||
1 | 231 |
!UndefinedObject methodsFor:'error catching'! |
232 |
||
233 |
basicAt:index |
|
234 |
"catch array access - its illegal |
|
235 |
defined here since basicAt: in Object ommits the nil-check" |
|
236 |
||
237 |
^ self notIndexed |
|
238 |
! |
|
239 |
||
240 |
basicAt:index put:anObject |
|
241 |
"catch array access - its illegal |
|
242 |
defined here since basicAt:put: in Object ommits the nil-check" |
|
243 |
||
244 |
^ self notIndexed |
|
245 |
! ! |
|
246 |
||
247 |
!UndefinedObject methodsFor:'printing & storing'! |
|
248 |
||
63 | 249 |
printOn:aStream |
250 |
"append a printed representation of the receiver to the |
|
251 |
argument, aStream" |
|
252 |
||
253 |
aStream nextPutAll:'nil' |
|
254 |
! |
|
255 |
||
695 | 256 |
printString |
257 |
"return a string for printing myself" |
|
258 |
||
259 |
^ 'nil' |
|
260 |
! |
|
261 |
||
63 | 262 |
storeOn:aStream |
263 |
"append a printed representation of the receiver to the |
|
264 |
argument, aStream, which allows reconstruction of it" |
|
265 |
||
266 |
^ self printOn:aStream |
|
695 | 267 |
! |
268 |
||
269 |
storeString |
|
270 |
"return a string for storing myself" |
|
271 |
||
272 |
^ 'nil' |
|
1 | 273 |
! ! |
2 | 274 |
|
5557 | 275 |
!UndefinedObject methodsFor:'queries'! |
276 |
||
277 |
basicSize |
|
278 |
"return the number of indexed instvars |
|
279 |
defined here since size in Object ommits the nil-check" |
|
280 |
||
281 |
^ 0 |
|
282 |
! |
|
283 |
||
284 |
size |
|
285 |
"return the number of indexed instvars |
|
286 |
defined here since size in Object ommits the nil-check" |
|
287 |
||
288 |
^ 0 |
|
289 |
! ! |
|
5471
a57eeb01c5ab
General encoding method (#encodeOn:with:)
Stefan Vogel <sv@exept.de>
parents:
4682
diff
changeset
|
290 |
|
77 | 291 |
!UndefinedObject methodsFor:'subclass creation'! |
292 |
||
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
293 |
nilSubclass:action |
356 | 294 |
"common helper for subclass creation. |
2040
8ba8b1002902
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Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
295 |
Creates a nil-superclass class. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
296 |
If the CreateMinimumProtocolInNewSubclassQuery answers true, |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
297 |
entries for the minimum required protocol (#class, #isBehavior |
8ba8b1002902
avoid intermediate Object subclass creation.
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parents:
1958
diff
changeset
|
298 |
and #doesNotUnderstand:) are also automatically created. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
299 |
(this query is typically answered by the browser) |
356 | 300 |
These are required to avoid getting into deep trouble when |
301 |
inspecting or debugging instances of this new class. |
|
302 |
The methods get a modified source code to remind you that these |
|
303 |
methods were automatically generated." |
|
304 |
||
1461
dd25bb1e9973
Use methodDictionary instead of selector/method arrays.
Stefan Vogel <sv@exept.de>
parents:
1303
diff
changeset
|
305 |
|newClass methodDict method| |
202 | 306 |
|
1461
dd25bb1e9973
Use methodDictionary instead of selector/method arrays.
Stefan Vogel <sv@exept.de>
parents:
1303
diff
changeset
|
307 |
Class withoutUpdatingChangesDo:[ |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
308 |
newClass := action value |
77 | 309 |
]. |
310 |
newClass notNil ifTrue:[ |
|
1029
c469a63e88e2
only redefine #class/#isbehavior/#doesNotUnderstand once (if no methods are present yet)
Claus Gittinger <cg@exept.de>
parents:
695
diff
changeset
|
311 |
newClass setSuperclass:nil. |
1803
754f9205b651
meta's superclass should be class - not Object.
Claus Gittinger <cg@exept.de>
parents:
1638
diff
changeset
|
312 |
newClass class setSuperclass:Class. |
356 | 313 |
|
1461
dd25bb1e9973
Use methodDictionary instead of selector/method arrays.
Stefan Vogel <sv@exept.de>
parents:
1303
diff
changeset
|
314 |
newClass methodDictionary size == 0 ifTrue:[ |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
315 |
Class addChangeRecordForClass:newClass. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
316 |
|
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
317 |
CreateMinimumProtocolInNewSubclassQuery query |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
318 |
ifTrue:[ |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
319 |
" |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
320 |
copy over method objects from Object |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
321 |
and modify the source code |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
322 |
" |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
323 |
methodDict := MethodDictionary new:3. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
324 |
#(#class #isBehavior #doesNotUnderstand:) do:[:sel| |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
325 |
method := (Object compiledMethodAt:sel) copy. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
326 |
method source: method source , ' |
356 | 327 |
" |
328 |
*** WARNING |
|
329 |
*** |
|
330 |
*** this method has been automatically created, |
|
331 |
*** since all nil-subclasses should respond to some minimum required |
|
332 |
*** protocol. |
|
333 |
*** |
|
334 |
*** Inspection and/or debugging of instances may not be possible, |
|
335 |
*** if you remove/change this method. |
|
336 |
" |
|
337 |
'. |
|
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
338 |
methodDict at:sel put:method. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
339 |
"/ newClass addChangeRecordForMethod:method |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
340 |
]. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
341 |
newClass methodDictionary:methodDict. |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
342 |
] |
1029
c469a63e88e2
only redefine #class/#isbehavior/#doesNotUnderstand once (if no methods are present yet)
Claus Gittinger <cg@exept.de>
parents:
695
diff
changeset
|
343 |
] |
77 | 344 |
]. |
345 |
^ newClass |
|
1029
c469a63e88e2
only redefine #class/#isbehavior/#doesNotUnderstand once (if no methods are present yet)
Claus Gittinger <cg@exept.de>
parents:
695
diff
changeset
|
346 |
|
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
347 |
"Modified: / 3.1.1997 / 15:53:21 / cg" |
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
348 |
"Created: / 3.1.1997 / 16:00:34 / cg" |
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
349 |
"Modified: / 18.3.1999 / 18:29:58 / stefan" |
202 | 350 |
! |
351 |
||
9256 | 352 |
subclass:nameSymbol instanceVariableNames:instVarNameString classVariableNames:classVarString poolDictionaries:pool |
353 |
"create a new class which has nil as superclass |
|
354 |
- i.e. traps into #doesNotUnderstand: for all of its messages." |
|
355 |
||
356 |
^ self |
|
357 |
subclass:nameSymbol |
|
358 |
instanceVariableNames:instVarNameString |
|
359 |
classVariableNames:classVarString |
|
360 |
poolDictionaries:pool |
|
361 |
category:(Class defaultCategoryForSTVorVAGEClasses). |
|
362 |
! |
|
363 |
||
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
364 |
subclass:nameSymbol instanceVariableNames:instVarNameString classVariableNames:classVarString poolDictionaries:pool category:cat |
202 | 365 |
"create a new class which has nil as superclass |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
366 |
- i.e. traps into #doesNotUnderstand: for all of its messages." |
202 | 367 |
|
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
368 |
^ self |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
369 |
nilSubclass:[ |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
370 |
Object class |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
371 |
name:nameSymbol |
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
372 |
inEnvironment:(Class nameSpaceQuerySignal query) |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
373 |
subclassOf:self |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
374 |
instanceVariableNames:instVarNameString |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
375 |
variable:false |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
376 |
words:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
377 |
pointers:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
378 |
classVariableNames:classVarString |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
379 |
poolDictionaries:pool |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
380 |
category:cat |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
381 |
comment:nil |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
382 |
changed:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
383 |
] |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
384 |
|
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
385 |
"Modified: / 3.1.1997 / 16:00:39 / cg" |
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
386 |
"Modified: / 18.3.1999 / 18:30:07 / stefan" |
695 | 387 |
! |
388 |
||
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
389 |
variableByteSubclass:nameSymbol instanceVariableNames:instVarNameString classVariableNames:classVarString poolDictionaries:pool category:cat |
695 | 390 |
"create a new class which has nil as superclass |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
391 |
- i.e. traps into #doesNotUnderstand: for all of its messages." |
695 | 392 |
|
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
393 |
^ self |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
394 |
nilSubclass:[ |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
395 |
Object class |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
396 |
name:nameSymbol |
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
397 |
inEnvironment:(Class nameSpaceQuerySignal query) |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
398 |
subclassOf:self |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
399 |
instanceVariableNames:instVarNameString |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
400 |
variable:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
401 |
words:false |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
402 |
pointers:false |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
403 |
classVariableNames:classVarString |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
404 |
poolDictionaries:pool |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
405 |
category:cat |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
406 |
comment:nil |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
407 |
changed:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
408 |
] |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
409 |
|
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
410 |
"Modified: / 3.1.1997 / 16:00:42 / cg" |
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
411 |
"Modified: / 18.3.1999 / 18:30:11 / stefan" |
695 | 412 |
! |
77 | 413 |
|
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
414 |
variableSubclass:nameSymbol instanceVariableNames:instVarNameString classVariableNames:classVarString poolDictionaries:pool category:cat |
159 | 415 |
"create a new class which has nil as superclass |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
416 |
- i.e. traps into #doesNotUnderstand: for all of its messages." |
77 | 417 |
|
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
418 |
^ self |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
419 |
nilSubclass:[ |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
420 |
Object class |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
421 |
name:nameSymbol |
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
422 |
inEnvironment:(Class nameSpaceQuerySignal query) |
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
423 |
subclassOf:self |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
424 |
instanceVariableNames:instVarNameString |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
425 |
variable:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
426 |
words:false |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
427 |
pointers:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
428 |
classVariableNames:classVarString |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
429 |
poolDictionaries:pool |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
430 |
category:cat |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
431 |
comment:nil |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
432 |
changed:true |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
433 |
] |
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
434 |
|
4060
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
435 |
"Modified: / 3.1.1997 / 16:00:45 / cg" |
1048a3abf128
Use #query instead of #raise when invoking QuerySignals
Stefan Vogel <sv@exept.de>
parents:
3914
diff
changeset
|
436 |
"Modified: / 18.3.1999 / 18:30:16 / stefan" |
695 | 437 |
! ! |
438 |
||
7262 | 439 |
!UndefinedObject methodsFor:'subclass creation-private'! |
5745 | 440 |
|
441 |
subclass:nameSymbol instanceVariableNames:instVarNameString classVariableNames:classVarString poolDictionaries:pool privateIn:ownerClass |
|
442 |
"create a new private class which has nil as superclass |
|
443 |
- i.e. traps into #doesNotUnderstand: for all of its messages." |
|
444 |
||
445 |
^ self |
|
446 |
nilSubclass:[ |
|
447 |
Object class |
|
448 |
name:nameSymbol |
|
449 |
inEnvironment:ownerClass |
|
450 |
subclassOf:self |
|
451 |
instanceVariableNames:instVarNameString |
|
452 |
variable:false |
|
453 |
words:true |
|
454 |
pointers:true |
|
455 |
classVariableNames:classVarString |
|
456 |
poolDictionaries:pool |
|
457 |
category:ownerClass category |
|
458 |
comment:nil |
|
459 |
changed:true |
|
460 |
] |
|
461 |
||
462 |
"Modified: / 3.1.1997 / 16:00:39 / cg" |
|
463 |
"Modified: / 18.3.1999 / 18:30:07 / stefan" |
|
464 |
! ! |
|
465 |
||
695 | 466 |
!UndefinedObject methodsFor:'testing'! |
467 |
||
1868 | 468 |
? defaultValue |
3466 | 469 |
"a syntactic shugar-piece: |
470 |
if the receiver is nil, return the defaultValue; |
|
1868 | 471 |
otherwise, return the receiver. |
472 |
This method is redefined from Object; |
|
473 |
the argument is retuned unconditionally here. |
|
474 |
||
1958 | 475 |
Thus, if foo and bar are simple variables or constants, |
476 |
foo ? bar |
|
477 |
is the same as: |
|
478 |
(foo isNil ifTrue:[bar] ifFalse:[foo]) |
|
479 |
||
480 |
if they are message sends, the equivalent code is: |
|
481 |
[ |
|
482 |
|t1 t2| |
|
483 |
||
484 |
t1 := foo. |
|
485 |
t2 := bar. |
|
486 |
t1 isNil ifTrue:[t2] ifFalse:[t1] |
|
487 |
] value |
|
488 |
||
1868 | 489 |
Can be used to provide defaultValues to variables, |
490 |
as in: |
|
1958 | 491 |
foo := arg ? #defaultValue |
1868 | 492 |
" |
493 |
||
494 |
^ defaultValue |
|
495 |
||
496 |
" |
|
497 |
1 ? #default |
|
498 |
nil ? #default |
|
499 |
" |
|
500 |
||
3466 | 501 |
"Created: / 4.11.1996 / 20:37:09 / cg" |
502 |
"Modified: / 19.5.1998 / 17:39:36 / cg" |
|
1868 | 503 |
! |
504 |
||
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
505 |
?? defaultValue |
3466 | 506 |
"a syntactic shugar-piece: |
507 |
much like ?, but sends value to the argument if required. |
|
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
508 |
If the receiver is nil, return the defaultValues value; |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
509 |
otherwise, return the receiver. |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
510 |
This method is redefined from Object. |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
511 |
|
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
512 |
Thus, if foo and bar are simple variables or constants, |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
513 |
foo ?? bar |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
514 |
is the same as: |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
515 |
(foo isNil ifTrue:[bar value] ifFalse:[foo]) |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
516 |
|
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
517 |
if they are message sends, the equivalent code is: |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
518 |
[ |
3466 | 519 |
|t| |
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
520 |
|
3466 | 521 |
t := foo. |
522 |
t isNil ifTrue:[bar value] ifFalse:[t] |
|
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
523 |
] value |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
524 |
|
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
525 |
Can be used to provide defaultValues to variables, |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
526 |
as in: |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
527 |
foo := arg ?? [something] |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
528 |
" |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
529 |
|
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
530 |
^ defaultValue value |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
531 |
|
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
532 |
" |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
533 |
1 ?? #default |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
534 |
nil ?? #default |
6069 | 535 |
1 ?? [Date today] |
536 |
nil ?? [Date today] |
|
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
537 |
" |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
538 |
|
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
539 |
"Created: / 4.11.1996 / 20:37:09 / cg" |
3466 | 540 |
"Modified: / 19.5.1998 / 17:42:10 / cg" |
3464
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
541 |
! |
b0009b3ea4f2
added ?? - much like ?, but sends #value to its argument.
Claus Gittinger <cg@exept.de>
parents:
3183
diff
changeset
|
542 |
|
7108
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
543 |
checkNilFileStream |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
544 |
"Do nothing if this is a valid FileStream |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
545 |
(i.e. the previous open operation was successful). |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
546 |
Also implemented in UndefinedObject, to raise an Error there. |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
547 |
|
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
548 |
This is an aid for converting from the old error reporting (returning nil) |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
549 |
to the new error reporting (with real Exceptions. |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
550 |
|
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
551 |
It will vanish as soon as the conversion has been done" |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
552 |
|
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
553 |
^ ExternalStream openErrorSignal raise |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
554 |
! |
90b7cfc06ab8
More openErrorSignal change preparations
Stefan Vogel <sv@exept.de>
parents:
6932
diff
changeset
|
555 |
|
695 | 556 |
hash |
557 |
"return an integer useful as a hash key" |
|
558 |
||
559 |
^ 0 |
|
560 |
! |
|
561 |
||
562 |
identityHash |
|
563 |
"return an integer useful as a hash key" |
|
564 |
||
565 |
^ 0 |
|
566 |
! |
|
567 |
||
4339
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
568 |
ifNil:aBlockOrValue |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
569 |
"return myself, or the result from evaluating the argument, if I am nil. |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
570 |
This is much like #?, but sends #value to the argument in case of a nil |
5796 | 571 |
receiver. |
572 |
Notice: |
|
573 |
This method is open coded (inlined) by the compiler(s) |
|
574 |
- redefining it may not work as expected." |
|
4339
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
575 |
|
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
576 |
^ aBlockOrValue value |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
577 |
! |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
578 |
|
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
579 |
ifNil:nilBlockOrValue ifNotNil:notNilBlockOrValue |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
580 |
"return the value of the first arg, if I am nil, |
5796 | 581 |
the result from evaluating the 2nd argument, if I am not nil. |
582 |
Notice: |
|
583 |
This method is open coded (inlined) by the compiler(s) |
|
584 |
- redefining it may not work as expected." |
|
4339
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
585 |
|
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
586 |
^ nilBlockOrValue value |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
587 |
! |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
588 |
|
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
589 |
ifNotNil:aBlockOrValue |
5796 | 590 |
"return myself if nil, or the result from evaluating the argument, if I am not nil. |
591 |
Notice: |
|
592 |
This method is open coded (inlined) by the compiler(s) |
|
593 |
- redefining it may not work as expected." |
|
4339
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
594 |
|
8574 | 595 |
^ nil |
4339
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
596 |
! |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
597 |
|
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
598 |
ifNotNil:notNilBlockOrValue ifNil:nilBlockOrValue |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
599 |
"return the value of the 2nd arg, if I am nil, |
5796 | 600 |
the result from evaluating the 1st argument, if I am not nil. |
601 |
Notice: |
|
602 |
This method is open coded (inlined) by the compiler(s) |
|
603 |
- redefining it may not work as expected." |
|
4339
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
604 |
|
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
605 |
^ nilBlockOrValue value |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
606 |
! |
18c19912a67c
added #ifNil and friends - squeak compatibility.
Claus Gittinger <cg@exept.de>
parents:
4321
diff
changeset
|
607 |
|
8574 | 608 |
ifNotNilDo:aBlock |
609 |
"if the reciever is non-nil, return the value of aBlock, passing myself as argument. |
|
610 |
Otherwise do nothing and return nil." |
|
611 |
||
612 |
^ nil |
|
613 |
! |
|
614 |
||
6181 | 615 |
isEmptyOrNil |
8833 | 616 |
"return true if I am nil or an empty collection - since I am nil, return true. |
617 |
(from Sqeak)" |
|
6181 | 618 |
|
619 |
^ true |
|
620 |
||
621 |
"Created: / 13.11.2001 / 13:16:40 / cg" |
|
6182 | 622 |
"Modified: / 13.11.2001 / 13:28:47 / cg" |
6181 | 623 |
! |
624 |
||
695 | 625 |
isLiteral |
4652
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
626 |
"return true, if the receiver can be used as a literal constant in ST syntax |
695 | 627 |
(i.e. can be used in constant arrays)" |
77 | 628 |
|
695 | 629 |
^ true |
630 |
! |
|
631 |
||
632 |
isNil |
|
9223 | 633 |
"Return true, if the receiver is nil. |
634 |
Since I am definitely nil, unconditionally return true here. |
|
3044 | 635 |
Notice: |
9223 | 636 |
This method is open coded (inlined) by the compiler(s) |
637 |
- redefining it may not work as expected." |
|
695 | 638 |
|
639 |
^ true |
|
640 |
! |
|
641 |
||
6068
1d5ca1175f3f
added #isNilOrEmptyCollection
Claus Gittinger <cg@exept.de>
parents:
5796
diff
changeset
|
642 |
isNilOrEmptyCollection |
8833 | 643 |
"return true if I am nil or an empty collection - false here. |
644 |
Obsolete, use isEmptyOrNil." |
|
645 |
||
646 |
<resource:#obsolete> |
|
6068
1d5ca1175f3f
added #isNilOrEmptyCollection
Claus Gittinger <cg@exept.de>
parents:
5796
diff
changeset
|
647 |
|
1d5ca1175f3f
added #isNilOrEmptyCollection
Claus Gittinger <cg@exept.de>
parents:
5796
diff
changeset
|
648 |
^ true |
6182 | 649 |
|
650 |
"Modified: / 13.11.2001 / 13:28:15 / cg" |
|
6068
1d5ca1175f3f
added #isNilOrEmptyCollection
Claus Gittinger <cg@exept.de>
parents:
5796
diff
changeset
|
651 |
! |
1d5ca1175f3f
added #isNilOrEmptyCollection
Claus Gittinger <cg@exept.de>
parents:
5796
diff
changeset
|
652 |
|
6932 | 653 |
notEmptyOrNil |
654 |
"Squeak compatibility: |
|
655 |
return true if I am neither nil nor an empty collection." |
|
656 |
||
657 |
^ false |
|
658 |
! |
|
659 |
||
695 | 660 |
notNil |
9223 | 661 |
"Return true, if the receiver is not nil. |
662 |
Since I am definitely nil, unconditionally return false here. |
|
3044 | 663 |
Notice: |
9223 | 664 |
This method is open coded (inlined) by the compiler(s) |
665 |
- redefining it may not work as expected." |
|
77 | 666 |
|
695 | 667 |
^ false |
77 | 668 |
! ! |
695 | 669 |
|
4652
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
670 |
!UndefinedObject methodsFor:'tracing'! |
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
671 |
|
4682 | 672 |
traceInto:aRequestor level:level from:referrer |
4652
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
673 |
"double dispatch into tracer, passing my type implicitely in the selector" |
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
674 |
|
4682 | 675 |
^ aRequestor traceUndefinedObject:self level:level from:referrer |
4652
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
676 |
|
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
677 |
|
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
678 |
! ! |
8b3118a923d1
added #hasSharedInstances & tracing support
Claus Gittinger <cg@exept.de>
parents:
4530
diff
changeset
|
679 |
|
8395
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
680 |
!UndefinedObject methodsFor:'visiting'! |
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
681 |
|
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
682 |
acceptVisitor:aVisitor with:aParameter |
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
683 |
|
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
684 |
^ aVisitor visitNilWith:aParameter |
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
685 |
! ! |
6bd97113cb4c
Generalize visitor pattern and define #visit...:with: -methods instead
Stefan Vogel <sv@exept.de>
parents:
8383
diff
changeset
|
686 |
|
695 | 687 |
!UndefinedObject class methodsFor:'documentation'! |
688 |
||
689 |
version |
|
9658 | 690 |
^ '$Header: /cvs/stx/stx/libbasic/UndefinedObject.st,v 1.66 2006-08-23 14:07:03 cg Exp $' |
695 | 691 |
! ! |
6932 | 692 |
|
2040
8ba8b1002902
avoid intermediate Object subclass creation.
Claus Gittinger <cg@exept.de>
parents:
1958
diff
changeset
|
693 |
UndefinedObject initialize! |