author | Claus Gittinger <cg@exept.de> |
Mon, 16 Dec 2019 11:42:21 +0100 | |
changeset 25129 | ab213b111236 |
parent 24734 | 008f54b2eb48 |
permissions | -rw-r--r-- |
22531 | 1 |
"{ Encoding: utf8 }" |
2 |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libbasic' }" |
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"{ NameSpace: Smalltalk }" |
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IdentityDictionary subclass:#ExceptionHandlerSet |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Kernel-Exceptions' |
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! |
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!ExceptionHandlerSet class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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|
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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34 |
inclusion of the above copyright notice. This software may not |
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35 |
be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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|
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! |
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41 |
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documentation |
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" |
20203 | 44 |
An ExceptionHandlerSet allows a group of unrelated signals to be handled |
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by individual handlers - their evaluation is equivalent to a corresponding |
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number of nested signal handlers, but more efficient and |
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somwehat easier to program and read. |
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48 |
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[author:] |
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50 |
Stefan Vogel |
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[see also:] |
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Exception Signal SignalSet |
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" |
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! |
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examples |
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" |
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[exBegin] |
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|h num| |
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h := ExceptionHandlerSet new. |
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h on:ZeroDivide |
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do:[:ex | 'division by zero' printCR. ex proceed]. |
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h on:HaltInterrupt |
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do:[:ex | 'halt encountered ' printCR. ex proceed]. |
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h on:DomainError |
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do:[:ex | 'domain error ' printCR. ex proceed]. |
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h handleDo:[ |
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num := 0. |
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'now dividing' printCR. |
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1 // num. |
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'now doing bad arcSin' printCR. |
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num := 50. |
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num arcSin. |
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'now halting' printCR. |
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self halt. |
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] |
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85 |
[exEnd] |
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86 |
|
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[exBegin] |
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|h num| |
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89 |
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h := ExceptionHandlerSet new. |
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h on:ZeroDivide |
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do:[:ex | 'division by zero' printCR. ex proceed]. |
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h on:HaltInterrupt |
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do:[:ex | 'halt encountered ' printCR. ex proceed]. |
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h on:DomainError |
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do:[:ex | 'domain error ' printCR. ex proceed]. |
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99 |
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[ |
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num := 0. |
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'now dividing' printCR. |
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1 // num. |
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'now doing bad arcSin' printCR. |
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num := 50. |
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num arcSin. |
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'now halting' printCR. |
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self halt. |
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] valueWithExceptionHandler:h |
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[exEnd] |
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" |
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! ! |
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116 |
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!ExceptionHandlerSet methodsFor:'Compatibility-VW5.4'! |
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118 |
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on:aSignalOrException handle:aHandler |
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"add a handler for aSignal to the set" |
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self on:aSignalOrException do:aHandler |
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123 |
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8478 | 124 |
"Created: / 26.7.1999 / 09:51:37 / stefan" |
125 |
! ! |
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126 |
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!ExceptionHandlerSet methodsFor:'queries'! |
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128 |
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23305 | 129 |
accepts:aSignalOrExceptionClass |
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"return true, if the receiver accepts the argument, aSignal. |
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(i.e. if any of the receiver's elements is aSignal or a parent of it)." |
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132 |
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self keysDo:[:eachExceptionHandler | |
23305 | 134 |
(eachExceptionHandler == aSignalOrExceptionClass |
135 |
or:[eachExceptionHandler accepts:aSignalOrExceptionClass]) ifTrue:[^ true]. |
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136 |
]. |
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137 |
^ false |
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138 |
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23305 | 139 |
"Created: / 26-07-1999 / 09:53:09 / stefan" |
140 |
"Modified (format): / 28-08-2018 / 11:28:00 / Claus Gittinger" |
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141 |
! |
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142 |
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exceptionHandlerFor:anException in:aContext |
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144 |
"answer the exceptionHandler for anException from aContext." |
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145 |
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146 |
^ self |
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147 |
! |
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148 |
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handlerForSignal:signal |
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"answer the handler block for signal" |
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151 |
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152 |
self keysAndValuesDo:[:sig :handler| |
4513 | 153 |
(sig == signal or:[sig accepts:signal]) ifTrue:[ |
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154 |
^ handler. |
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155 |
]. |
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156 |
]. |
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157 |
|
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158 |
^ nil |
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159 |
|
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160 |
"Modified: / 26.7.1999 / 09:59:43 / stefan" |
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161 |
"Created: / 26.7.1999 / 11:29:29 / stefan" |
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162 |
! |
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163 |
|
24734 | 164 |
handlerForSignal:exceptionCreator context:theContext originator:originator |
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165 |
"answer the handler block for the signal from originator. |
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166 |
The block is retrieved from aContext. |
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167 |
Answer nil if the signal is not handled" |
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168 |
|
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169 |
|
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170 |
(theContext selector ~~ #'handleDo:from:' |
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171 |
or:[(theContext argAt:2) == originator]) ifTrue:[ |
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172 |
self keysAndValuesDo:[:sig :handler| |
24734 | 173 |
(sig == exceptionCreator or:[sig accepts:exceptionCreator]) ifTrue:[ |
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174 |
^ handler ? [nil]. |
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175 |
]. |
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176 |
]. |
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177 |
]. |
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178 |
|
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179 |
^ nil |
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180 |
|
24734 | 181 |
"Created: / 26-07-1999 / 09:53:28 / stefan" |
182 |
"Modified (format): / 06-09-2019 / 15:48:19 / Stefan Reise" |
|
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183 |
! |
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184 |
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185 |
handlerProtectedBlock:doBlock inContext:context |
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186 |
"set the handlerProtectedBlock in context" |
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187 |
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188 |
context argAt:1 put:doBlock. |
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189 |
|
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190 |
" |
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191 |
|s| |
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192 |
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193 |
s := ExceptionHandlerSet new. |
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194 |
s at:Error put:[:ex| ex restartDo:[55]]. |
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195 |
|
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196 |
s handleDo:[1 // 0] |
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197 |
" |
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198 |
|
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199 |
! |
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200 |
|
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201 |
handles:anException |
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202 |
"return true, if the receiver handles the argument, anException. |
19444 | 203 |
(i.e. if any of the receiver's elements handles anException)." |
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204 |
|
23305 | 205 |
^ self accepts:(anException creator). |
206 |
||
207 |
"/ self keysDo:[:eachExceptionHandler| |
|
208 |
"/ (eachExceptionHandler handles:anException) ifTrue:[^ true] |
|
209 |
"/ ]. |
|
210 |
"/ ^ false |
|
211 |
||
212 |
"Modified: / 28-08-2018 / 11:28:30 / Claus Gittinger" |
|
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213 |
! ! |
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214 |
|
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215 |
!ExceptionHandlerSet methodsFor:'save evaluation'! |
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216 |
|
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217 |
handleDo:aBlock |
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218 |
"evaluate the argument, aBlock. |
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219 |
If any of the signals in the receiver is raised during evaluation, |
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220 |
evaluate the handleBlock passing it an Exception argument. |
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221 |
The handler may decide how to react to the signal by sending |
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222 |
a corresponding message to the exception (see there). |
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223 |
If the signal is not raised, return the value of evaluating |
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224 |
aBlock." |
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225 |
|
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226 |
<context: #return> |
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227 |
<exception: #handle> |
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228 |
|
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229 |
"/ thisContext markForHandle. -- same as above pragma |
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230 |
^ aBlock value "the real logic is in Exception>>doRaise" |
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231 |
|
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232 |
" |
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233 |
|h num| |
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234 |
|
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235 |
h := ExceptionHandlerSet new. |
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236 |
h on:(Number divisionByZeroSignal) |
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237 |
handle:[:ex | 'division by zero' printNL. ex proceed]. |
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238 |
|
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239 |
h on:(Object haltSignal) |
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240 |
handle:[:ex | 'halt encountered ' printNL. ex proceed]. |
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241 |
|
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242 |
h on:(Float domainErrorSignal) |
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243 |
handle:[:ex | 'domain error ' printNL. ex proceed]. |
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244 |
|
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245 |
h handleDo:[ |
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246 |
num := 0. |
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|
247 |
|
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248 |
'now dividing' printNL. |
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249 |
1 // num. |
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250 |
|
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251 |
'now doing bad arcSin' printNL. |
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252 |
num := 50. |
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253 |
num arcSin. |
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254 |
|
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255 |
'now halting' printNL. |
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256 |
self halt. |
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257 |
] |
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258 |
" |
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|
259 |
|
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260 |
"Created: / 26.7.1999 / 09:56:44 / stefan" |
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261 |
"Modified: / 26.7.1999 / 11:01:53 / stefan" |
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|
262 |
! |
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|
263 |
|
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|
264 |
handleDo:aBlock from:originator |
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|
265 |
"evaluate the argument, aBlock. |
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|
266 |
If any of the signals in the receiver is raised during evaluation, |
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|
267 |
evaluate the handleBlock passing it an Exception argument. |
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|
268 |
The handler may decide how to react to the signal by sending |
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|
269 |
a corresponding message to the exception (see there). |
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|
270 |
If the signal is not raised, return the value of evaluating |
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|
271 |
aBlock." |
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272 |
|
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273 |
<context: #return> |
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274 |
<exception: #handle> |
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275 |
|
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276 |
"/ thisContext markForHandle. -- same as above pragma |
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277 |
^ aBlock value "the real logic is in Exception>>doRaise" |
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278 |
|
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279 |
" |
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280 |
|h num| |
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281 |
|
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282 |
h := ExceptionHandlerSet new. |
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283 |
h on:(Number divisionByZeroSignal) |
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284 |
handle:[:ex | 'division by zero' printNL. ex proceed]. |
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285 |
|
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286 |
h on:(Object haltSignal) |
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287 |
handle:[:ex | 'halt encountered ' printNL. ex proceed]. |
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288 |
|
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h on:(Float domainErrorSignal) |
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handle:[:ex | 'domain error ' printNL. ex proceed]. |
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h handleDo:[ |
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'now halting' printNL. |
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self halt. |
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295 |
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'the following exceptions are not handled. |
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A debugger is opened' printNL. |
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'now dividing' printNL. |
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num := 0. |
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1 // num. |
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|
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'now doing bad arcSin' printNL. |
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num := 50. |
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num arcSin. |
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] from:self |
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" |
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308 |
|
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"Created: / 26.7.1999 / 09:56:44 / stefan" |
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"Modified: / 26.7.1999 / 11:36:47 / stefan" |
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! ! |
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|
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!ExceptionHandlerSet methodsFor:'setup'! |
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||
22712 | 315 |
on:anExceptionHandlerOrHandlerCollection do:aHandlerBlock |
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"add a handler for aSignal to the set. |
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anExceptionHandlerOrHandlerCollection may be a single exceptionHandler or |
|
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a Collection of exceptionHandlers (e.g. Array or SignalSet)" |
|
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anExceptionHandlerOrHandlerCollection asCollectionDo:[:eachHandler| |
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eachHandler isBehavior ifTrue:[ |
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"load class, if not yet loaded" |
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eachHandler autoload. |
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]. |
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eachHandler isExceptionHandler ifFalse:[ |
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SignalError raiseWith:eachHandler errorString:' - trying to add a non-exceptionHandler to a SignalSet'. |
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]. |
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self at:eachHandler put:aHandlerBlock. |
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22531 | 329 |
]. |
22712 | 330 |
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"Modified (comment): / 26-04-2018 / 14:23:45 / stefan" |
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22531 | 332 |
! ! |
333 |
||
8700 | 334 |
!ExceptionHandlerSet methodsFor:'testing'! |
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||
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isExceptionHandler |
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"return true, if the receiver responds to the exception handler protocol, |
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especially to the #accepts: and #handles: messages" |
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||
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^ true |
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! ! |
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||
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!ExceptionHandlerSet class methodsFor:'documentation'! |
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|
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version |
19444 | 346 |
^ '$Header$' |
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! ! |
15063 | 348 |