/usr/share/gnu-smalltalk/kernel/DynVariable.st is in gnu-smalltalk-common 3.2.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | "======================================================================
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| DynamicVariable Method Definitions
|
|
======================================================================"
"======================================================================
|
| Copyright 2010 Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
|
| The GNU Smalltalk class library is distributed in the hope that it will be
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
| General Public License for more details.
|
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.
|
======================================================================"
Object subclass: DynamicVariable [
<category: 'Language-Utilities'>
<comment: 'I am a variable that is visible only in the stackframes
outgoing from this one. Do not use DynamicVariable directly,
instead create a subclass for each variable you want to use.
You can override the #value class method, and call #valueIfAbsent: from
there if you want the default value to be something else than nil.'>
DynamicVariable class [
| processVariable |
processVariable [
<category: 'private'>
processVariable isNil ifTrue: [
processVariable :=
ProcessEnvironment uniqueInstance associationAt: self ].
^processVariable
]
use: anObject during: aBlock [
<category: 'evaluating'>
^self processVariable use: anObject during: aBlock
]
valueIfAbsent: aBlock [
<category: 'evaluating'>
^self processVariable valueIfAbsent: aBlock
]
value [
<category: 'evaluating'>
^self processVariable value
]
]
]
|