author | Claus Gittinger <cg@exept.de> |
Thu, 20 Jul 2000 19:57:00 +0200 | |
changeset 1059 | 7ce5819138e8 |
parent 913 | bd05fb9dbc9a |
child 1081 | 6e6255672d68 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1993 by Claus Gittinger |
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All Rights Reserved |
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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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||
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Parser subclass:#Explainer |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'System-Compiler' |
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! |
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!Explainer class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1993 by Claus Gittinger |
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All Rights Reserved |
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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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! |
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||
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documentation |
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" |
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a very simple explainer - much more should be added ... |
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This one is involved, when the 'explain' function is used in a |
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codeView (popup or via CMD-E). |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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||
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!Explainer class methodsFor:'explaining'! |
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commonSuperClassOf:listOfClassNames |
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|common found| |
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listOfClassNames do:[:className | |
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|class| |
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class := Smalltalk classNamed:className. |
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common isNil ifTrue:[ |
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common := class |
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] ifFalse:[ |
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(class isSubclassOf:common) ifTrue:[ |
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"keep common" |
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] ifFalse:[ |
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(common isSubclassOf:class) ifTrue:[ |
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common := class |
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] ifFalse:[ |
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"walk up, checking" |
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found := false. |
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common allSuperclassesDo:[:sup | |
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(class isSubclassOf:sup) ifTrue:[ |
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common := sup |
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] |
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]. |
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found ifFalse:[ |
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class allSuperclassesDo:[:sup | |
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(common isSubclassOf:sup) ifTrue:[ |
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common := sup |
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] |
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]. |
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]. |
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] |
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]. |
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]. |
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common == Object ifTrue:[^ common] |
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]. |
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^ common |
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"Modified: 17.6.1996 / 17:09:21 / stefan" |
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"Modified: 5.9.1996 / 19:34:41 / cg" |
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! |
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explain:someText in:source forClass:aClass |
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"Given a source and a substring of it, return a string containing |
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an explanation. |
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This is just a q&d implementation - to be correct, it should use the parser, |
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and explain from the parsetree (instead of doing string matches). |
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This leads to some wrong explanations, for example if some string is |
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used as selector within a string, or if a variable is named like a |
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message selector. I.e. the explanation should be context sensitive. |
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Also, there could be much more detailed explanations." |
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|parser variables v c string tmp |
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spc sym sel stringText| |
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string := someText string withoutSeparators. |
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stringText := string asText allBold. |
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" |
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ask parser for variable names |
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" |
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parser := self parseMethod:source in:aClass ignoreErrors:true ignoreWarnings:true. |
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parser notNil ifTrue:[ |
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"look for variables" |
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variables := parser methodVars. |
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(variables notNil and:[variables includes:string]) ifTrue:[ |
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^ '''' , stringText , ''' is a method variable' |
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]. |
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variables := parser methodArgs. |
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(variables notNil and:[variables includes:string]) ifTrue:[ |
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^ '''' , stringText , ''' is a method argument' |
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] |
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]. |
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parser isNil ifTrue:[ |
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parser := self for:(ReadStream on:source) in:aClass |
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]. |
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"instvars" |
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c := aClass whichClassDefinesInstVar:string. |
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c notNil ifTrue:[ |
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c isMeta ifTrue:[ |
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^ '''' , stringText , ''' is a class instance variable in ' , c soleInstance name |
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]. |
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^ '''' , stringText , ''' is an instance variable in ' , c name |
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]. |
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"/ variables := aClass allInstVarNames. |
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"/ (variables notNil and:[variables includes:string]) ifTrue:[ |
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"/ "where is it" |
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"/ c := aClass. |
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"/ [c notNil] whileTrue:[ |
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"/ v := c instVarNames. |
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"/ (v notNil and:[v includes:string]) ifTrue:[ |
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"/ ^ string , ' is an instance variable in ' , c name |
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"/ ]. |
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"/ c := c superclass |
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"/ ]. |
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"/ self error:'oops' |
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"/ ]. |
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"/ "class instvars" |
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"/ variables := aClass class allInstVarNames. |
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"/ (variables notNil and:[variables includes:string]) ifTrue:[ |
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"/ "where is it" |
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"/ c := aClass. |
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"/ [c notNil] whileTrue:[ |
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"/ v := c class instVarNames. |
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"/ (v notNil and:[v includes:string]) ifTrue:[ |
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"/ ^ string , ' is a class instance variable in ' , c name |
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"/ ]. |
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"/ c := c superclass |
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"/ ]. |
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"/ self error:'oops' |
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"/ ]. |
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"classvars" |
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c := parser inWhichClassIsClassVar:string. |
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c notNil ifTrue:[ |
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^ '''' , stringText , ''' is a class variable in ' , c name |
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]. |
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aClass isMeta ifTrue:[ |
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c := aClass soleInstance. |
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] ifFalse:[ |
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c := aClass. |
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]. |
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c privateClasses do:[:pClass | |
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(pClass name = string |
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or:[pClass nameWithoutPrefix = string]) ifTrue:[ |
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^ ('''' , stringText , ''' is a private class in ''' , c name , '''.' |
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, '\\It is only visible locally.') withCRs |
182 |
]. |
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183 |
]. |
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184 |
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456 | 185 |
(spc := aClass nameSpace) notNil ifTrue:[ |
796 | 186 |
sym := (spc name , '::' , string) asSymbolIfInterned. |
187 |
sym notNil ifTrue:[ |
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(Smalltalk at:sym) isBehavior ifTrue:[ |
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^ ('''' , stringText , ''' is a class in the ''' , spc name , ''' nameSpace.' |
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, '\\It is only visible within this nameSpace.' |
191 |
, '\Access from the outside is possible' |
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, '\by the special name ''' , spc name , '::' , string , '''.') withCRs |
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]. |
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]. |
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]. |
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"/ string knownAsSymbol ifTrue:[ |
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"globals & symbols" |
2 | 199 |
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tmp := self explainKnownSymbol:string inClass:aClass. |
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tmp notNil ifTrue:[ ^ tmp]. |
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203 |
"/ try with added colon ... |
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204 |
sel := string , ':'. |
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205 |
Symbol allInstancesDo:[:sym | |
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206 |
(sym startsWith:sel) ifTrue:[ |
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207 |
tmp := self explainKnownSymbol:sym inClass:aClass. |
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tmp notNil ifTrue:[ ^ tmp]. |
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209 |
] |
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]. |
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"/ ]. |
2 | 212 |
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213 |
"try for some obvious things" |
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tmp := self explainPseudoVariable:string in:aClass. |
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tmp notNil ifTrue:[ ^ tmp]. |
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216 |
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217 |
"try syntax ..." |
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218 |
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49 | 219 |
tmp := self explainSyntax:string. |
220 |
tmp notNil ifTrue:[ ^ tmp]. |
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2 | 222 |
parser isNil ifTrue:[ |
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^ 'parse error - no explanation' |
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]. |
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^ 'cannot explain this (could not figure out what this is).' |
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"Created: / 3.12.1995 / 12:47:37 / cg" |
228 |
"Modified: / 16.4.1997 / 12:46:11 / stefan" |
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"Modified: / 23.3.1999 / 13:29:56 / cg" |
2 | 230 |
! |
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141 | 232 |
explainHereIn:aClass |
233 |
^ 'like self, here refers to the object which received the message. |
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234 |
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235 |
However, when sending a message to here the search for methods |
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implementing this message will start in the defining class (' , aClass name , ') |
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instead of the receivers class (' , aClass name , ' or subclass). |
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238 |
Thus, using here, redefined methods will NOT be reached with a here-send.' |
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! |
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240 |
||
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explainKnownSymbol:string inClass:aClass |
141 | 242 |
"return explanation or nil" |
243 |
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|sym list count tmp commonSuperClass val s s2 |
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firstImplementingClass cm msg| |
141 | 246 |
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796 | 247 |
sym := string asSymbolIfInterned. |
248 |
sym isNil ifTrue:[^ nil]. |
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141 | 249 |
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250 |
"try globals" |
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251 |
||
252 |
(Smalltalk includesKey:sym) ifTrue:[ |
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tmp := '''' , string asText allBold , ''' is a global variable.'. |
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val := Smalltalk at:sym. |
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val isBehavior ifTrue:[ |
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val name = string ifTrue:[ |
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tmp := tmp , ' |
141 | 258 |
|
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' , string , ' is ' , (val isLoaded ifTrue:['a'] ifFalse:['an autoloaded']) |
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, ' class categorized as ' , val category , ' |
141 | 261 |
in the ''' , val package , ''' package.' |
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] ifFalse:[ |
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tmp := tmp , ' |
141 | 264 |
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265 |
' , string , ' is bound to the class ' , val name , |
|
266 |
' in category ' , val category , '.' |
|
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] |
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] ifFalse:[ |
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269 |
tmp := tmp , ' |
141 | 270 |
|
271 |
Its current value is ' , val classNameWithArticle , '.' |
|
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]. |
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|
273 |
^ tmp. |
141 | 274 |
]. |
275 |
||
276 |
" |
|
277 |
try selectors |
|
278 |
look who implements it |
|
279 |
" |
|
280 |
list := Set new. |
|
281 |
Smalltalk allBehaviorsDo:[:c| |
|
290
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|
282 |
(c implements:sym) ifTrue:[ |
911
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|
283 |
list add:(c name). |
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|
284 |
firstImplementingClass isNil ifTrue:[ |
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|
285 |
firstImplementingClass := c |
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|
286 |
] |
290
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changeset
|
287 |
]. |
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|
288 |
(c class implements:sym) ifTrue:[ |
911
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|
289 |
list add:(c name , ' class'). |
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|
290 |
firstImplementingClass isNil ifTrue:[ |
912 | 291 |
firstImplementingClass := c class |
911
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|
292 |
] |
290
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|
293 |
] |
141 | 294 |
]. |
295 |
||
835 | 296 |
(aClass canUnderstand:sym) ifTrue:[ |
297 |
s2 := ('\\Instances of ''' , aClass name , ''' respond to #') withCRs , sym asText allBold |
|
911
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|
298 |
, '\- inherited from ' withCRs, (aClass whichClassImplements:sym) name asText allBold. |
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changeset
|
299 |
|
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|
300 |
firstImplementingClass := (aClass whichClassImplements:sym) |
835 | 301 |
] ifFalse:[ |
302 |
s2 := ''. |
|
303 |
]. |
|
304 |
||
141 | 305 |
count := list size. |
306 |
(count ~~ 0) ifTrue:[ |
|
290
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Change the name of a classes Metaclass from e.g. "SmallIntegerclass" to
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|
307 |
" |
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diff
changeset
|
308 |
for up-to 4 implementing classes, |
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263
diff
changeset
|
309 |
list them |
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Change the name of a classes Metaclass from e.g. "SmallIntegerclass" to
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diff
changeset
|
310 |
" |
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diff
changeset
|
311 |
list := list asOrderedCollection sort. |
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diff
changeset
|
312 |
tmp := ' is a selector implemented in '. |
835 | 313 |
s := '#' , string asText allBold. |
911
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diff
changeset
|
314 |
|
290
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diff
changeset
|
315 |
(count == 1) ifTrue:[ |
911
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changeset
|
316 |
msg := s , tmp , (list at:1) , '.' , s2. |
be6ce6482a7f
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diff
changeset
|
317 |
] ifFalse:[ |
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
318 |
(count == 2) ifTrue:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
319 |
msg := s , tmp , (list at:1) , ' and ' , (list at:2) , '.' , s2 |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
320 |
] ifFalse:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
321 |
(count == 3) ifTrue:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
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839
diff
changeset
|
322 |
msg := s , tmp , ' |
835 | 323 |
' , (list at:1) , ', ' , (list at:2) , ' and ' , (list at:3) , '.' , s2 |
911
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
324 |
] ifFalse:[ |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
325 |
(count == 4) ifTrue:[ |
be6ce6482a7f
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839
diff
changeset
|
326 |
msg := s , tmp , ' |
835 | 327 |
' , (list at:1) , ', ' , (list at:2) , ', ' , (list at:3), ' and ' , (list at:4) , '.' , s2 |
911
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
328 |
] ifFalse:[ |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
329 |
" |
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
330 |
if there are more, look for a common |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
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839
diff
changeset
|
331 |
superclass and show it ... |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
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changeset
|
332 |
" |
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extract the methods comment and show it.
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parents:
839
diff
changeset
|
333 |
commonSuperClass := self commonSuperClassOf:list. |
913 | 334 |
(commonSuperClass ~~ Object |
335 |
and:[commonSuperClass ~~ Behavior |
|
336 |
and:[commonSuperClass ~~ Class |
|
337 |
and:[commonSuperClass ~~ ClassDescription]]]) ifTrue:[ |
|
911
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
338 |
(list includes:commonSuperClass) ifTrue:[ |
be6ce6482a7f
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parents:
839
diff
changeset
|
339 |
msg := s . tmp , count printString , commonSuperClass name |
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parents:
839
diff
changeset
|
340 |
, ' and redefined in ' , (count - 1) printString |
be6ce6482a7f
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839
diff
changeset
|
341 |
, ' subclasses' |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
342 |
, s2. |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
343 |
firstImplementingClass := commonSuperClass |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
344 |
] ifFalse:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
345 |
msg := s , tmp, count printString , ' subclasses of ' , commonSuperClass name , s2 |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
346 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
347 |
] ifFalse:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
348 |
(commonSuperClass == Object |
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839
diff
changeset
|
349 |
and:[commonSuperClass implements:sym]) ifTrue:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
350 |
msg := s , tmp , count printString , ' classes. |
834 | 351 |
|
352 |
All objects seem to respond to that message, |
|
911
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
353 |
since there is an implementation in Object.' , s2. |
141 | 354 |
|
911
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
355 |
firstImplementingClass := Object |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
356 |
] ifFalse:[ |
913 | 357 |
((commonSuperClass == Behavior |
358 |
or:[commonSuperClass == Class |
|
359 |
or:[commonSuperClass == ClassDescription]]) |
|
360 |
and:[commonSuperClass implements:sym]) ifTrue:[ |
|
361 |
msg := s , tmp , count printString , ' classes. |
|
362 |
||
363 |
All classes seem to respond to that message, |
|
364 |
since there is an implementation in ' , commonSuperClass name , '.' , s2. |
|
365 |
||
366 |
firstImplementingClass := commonSuperClass |
|
367 |
] ifFalse:[ |
|
368 |
" |
|
369 |
otherwise just give the number. |
|
370 |
" |
|
371 |
msg := s , tmp , count printString , ' classes.' , s2 |
|
372 |
] |
|
911
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
373 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
374 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
375 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
376 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
377 |
]. |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
378 |
]. |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
379 |
firstImplementingClass notNil ifTrue:[ |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
380 |
WindowGroup activeGroup withWaitCursorDo:[ |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
381 |
cm := firstImplementingClass compiledMethodAt:sym. |
be6ce6482a7f
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Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
382 |
cm notNil ifTrue:[ |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
383 |
cm := cm methodComment. |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
384 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
385 |
]. |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
386 |
cm notNil ifTrue:[ |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
387 |
msg := msg , '\\The comment in ' withCRs , firstImplementingClass name asText allBold , ' is:\' withCRs , cm asText allItalic. |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
388 |
] |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
389 |
]. |
be6ce6482a7f
extract the methods comment and show it.
Claus Gittinger <cg@exept.de>
parents:
839
diff
changeset
|
390 |
^ msg |
141 | 391 |
]. |
392 |
||
393 |
^ nil |
|
290
d1650b17b9e9
Change the name of a classes Metaclass from e.g. "SmallIntegerclass" to
Stefan Vogel <sv@exept.de>
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263
diff
changeset
|
394 |
|
796 | 395 |
"Modified: / 17.6.1996 / 17:09:30 / stefan" |
835 | 396 |
"Created: / 23.3.1999 / 13:29:33 / cg" |
397 |
"Modified: / 23.3.1999 / 13:40:40 / cg" |
|
141 | 398 |
! |
399 |
||
2 | 400 |
explainPseudoVariable:string in:aClass |
401 |
"return explanation for the pseudoVariables self, super etc." |
|
402 |
||
403 |
(string = 'self') ifTrue:[ |
|
49 | 404 |
^ self explainSelfIn:aClass |
2 | 405 |
]. |
406 |
||
407 |
(string = 'super') ifTrue:[ |
|
49 | 408 |
^ self explainSuperIn:aClass |
2 | 409 |
]. |
410 |
||
84 | 411 |
(string = 'here') ifTrue:[ |
412 |
^ self explainHereIn:aClass |
|
413 |
]. |
|
414 |
||
2 | 415 |
(string = 'thisContext') ifTrue:[ |
49 | 416 |
^ 'thisContext is a pseudo variable (i.e. it is built in). |
2 | 417 |
|
49 | 418 |
ThisContext always refers to the context object for the currently executed method or |
419 |
block (an instance of Context or BlockContext respectively). The calling chain and calling |
|
6 | 420 |
receivers/selectors can be accessed via thisContext.' |
421 |
]. |
|
422 |
||
423 |
(string = 'true') ifTrue:[ |
|
49 | 424 |
^ 'true is a pseudo variable (i.e. it is built in). |
6 | 425 |
|
426 |
True represents logical truth. It is the one and only instance of class True.' |
|
2 | 427 |
]. |
428 |
||
429 |
(string = 'false') ifTrue:[ |
|
49 | 430 |
^ 'false is a pseudo variable (i.e. it is built in). |
2 | 431 |
|
432 |
False represents logical falseness. It is the one and only instance of class False.' |
|
433 |
]. |
|
434 |
||
435 |
(string = 'nil') ifTrue:[ |
|
49 | 436 |
^ 'nil is a pseudo variable (i.e. it is built in). |
2 | 437 |
|
438 |
Nil is used for unitialized variables (among other uses). |
|
439 |
Nil is the one and only instance of class UndefinedObject.' |
|
440 |
]. |
|
441 |
^ nil |
|
442 |
! |
|
443 |
||
6 | 444 |
explainSelfIn:aClass |
445 |
|sub| |
|
446 |
||
447 |
sub := aClass allSubclasses collect:[:c | c name]. |
|
448 |
sub size == 0 ifTrue:[ |
|
49 | 449 |
^ 'self refers to the object which received the message. |
6 | 450 |
|
451 |
In this case, it will be an instance of ' , aClass name , '.' |
|
452 |
]. |
|
453 |
||
454 |
sub size <= 5 ifTrue:[ |
|
49 | 455 |
^ 'self refers to the object which received the message. |
6 | 456 |
|
457 |
In this case, it will be an instance of ' , aClass name , ' |
|
458 |
or one of its subclasses: |
|
459 |
||
58 | 460 |
' , sub asStringCollection asString |
6 | 461 |
]. |
462 |
||
463 |
^ 'self refers to the object which received the message. |
|
464 |
||
465 |
In this case, it will be an instance of ' , aClass name , ' |
|
466 |
or one of its ' , sub size printString , ' subclasses.' |
|
467 |
! |
|
468 |
||
469 |
explainSuperIn:aClass |
|
470 |
^ 'like self, super refers to the object which received the message. |
|
471 |
||
472 |
However, when sending a message to super the search for methods |
|
473 |
implementing this message will start in the superclass (' , aClass superclass name , ') |
|
84 | 474 |
instead of the receivers class (' , aClass name , ' or subclass). |
49 | 475 |
Thus, using super, a redefined method can call the original method in its superclass.' |
6 | 476 |
! |
2 | 477 |
|
49 | 478 |
explainSyntax:string |
479 |
"try syntax ...; return explanation or nil" |
|
480 |
||
481 |
((string = ':=') or:[string = '_']) ifTrue:[ |
|
796 | 482 |
^ '<variable> := <expression> |
49 | 483 |
|
834 | 484 |
'':='' and ''_'' (which is left-arrow in some fonts) mean assignment. |
49 | 485 |
The variable is bound to (i.e. points to) the value of <expression>.' |
486 |
]. |
|
487 |
||
488 |
(string = '^') ifTrue:[ |
|
796 | 489 |
^ '^ <expression> |
49 | 490 |
|
834 | 491 |
returns the value of <expression> as value from the method. |
49 | 492 |
A return from within a block exits the method where the block is defined.' |
493 |
]. |
|
494 |
||
495 |
(string = ';') ifTrue:[ |
|
796 | 496 |
^ '<expression> ; selector1 ; .... ; selectorN |
49 | 497 |
|
498 |
a cascade expression; evaluate expression, and send messages |
|
499 |
<selector1> ... <selectorN> to the first expressions receiver. |
|
500 |
Returns the value of the last send. The cascade sends may also have arguments.' |
|
501 |
]. |
|
502 |
||
503 |
(string = '|') ifTrue:[ |
|
796 | 504 |
^ '| locals | or: [:arg | statements] |
49 | 505 |
|
834 | 506 |
''|'' is used to mark a local variable declaration or separates arguments |
49 | 507 |
from the statements in a block. Notice, that in a block-argument declaration |
508 |
these must be prefixed by a colon character. |
|
834 | 509 |
''|'' is also a selector understood by Booleans.' |
49 | 510 |
]. |
511 |
||
512 |
((string startsWith:'(') or:[string endsWith:')']) ifTrue:[ |
|
796 | 513 |
^ '(<expression>) |
49 | 514 |
|
515 |
expression grouping.' |
|
516 |
]. |
|
517 |
||
518 |
((string startsWith:'[') or:[string endsWith:']']) ifTrue:[ |
|
834 | 519 |
^ '[:arg1 .. :argN | statements] |
49 | 520 |
|
521 |
defines a block. |
|
522 |
Blocks represent pieces of executable code. Definition of a block does |
|
523 |
not evaluate it. The block is evaluated by sending it a value/value: |
|
524 |
message. |
|
525 |
Blocks are often passed as arguments to Booleans (i.e. ifTrue:[...]) or |
|
526 |
collections (i.e. do:[...]).' |
|
527 |
]. |
|
528 |
||
529 |
(string = ':') ifTrue:[ |
|
796 | 530 |
^ 'colons have different meaning depending on context: |
49 | 531 |
|
532 |
1) they separate keyword-parts in symbols and keyword-messages as in: |
|
533 |
||
534 |
#at:put: a constant keyword symbol |
|
535 |
||
536 |
rec at:index put:value sends the #at:put: message to rec, |
|
796 | 537 |
passing index and value as arguments. |
49 | 538 |
|
539 |
2) within block-argument declarations as in: |
|
540 |
||
541 |
[:arg1 :arg2 | statements] |
|
834 | 542 |
|
543 |
3) within an identifier, they separate the nameSpace part from |
|
544 |
the name part; as in: |
|
545 |
||
546 |
Smalltalk::Array - the Array class in the Smalltalk nameSpace. |
|
547 |
Foo::Array - the Array class in the Foo nameSpace. |
|
49 | 548 |
' |
549 |
]. |
|
550 |
||
551 |
(string = '.') ifTrue:[ |
|
796 | 552 |
^ 'statement. "<- period here" |
49 | 553 |
statement |
554 |
||
555 |
within a method or block, individual statements are separated by periods. |
|
556 |
' |
|
557 |
]. |
|
558 |
||
559 |
(string startsWith:'#' ) ifTrue:[ |
|
796 | 560 |
(string startsWith:'#(' ) ifTrue:[ |
561 |
^ 'is a constant Array. |
|
49 | 562 |
|
563 |
The elements of a constant Array must be Number-constants, nil, true or false. |
|
564 |
(notice, that not all Smalltalk implementations allow true, false and nil as |
|
565 |
constant-Array elements).' |
|
796 | 566 |
]. |
49 | 567 |
|
796 | 568 |
(string startsWith:'#[') ifTrue:[ |
569 |
^ 'is a constant ByteArray. |
|
49 | 570 |
|
571 |
The elements of a constant ByteArray must be Integer constants in the range |
|
572 |
0 .. 255. |
|
573 |
(notice, that not all Smalltalk implementations support constant ByteArrays).' |
|
796 | 574 |
]. |
49 | 575 |
|
796 | 576 |
(string startsWith:'#''') ifTrue:[ |
577 |
^ 'is a constant symbol containing non-alphanumeric characters. |
|
49 | 578 |
|
579 |
Symbols are unique strings, meaning that there exists |
|
580 |
exactly one instance of a given symbol. Therefore symbols can |
|
581 |
be compared using == (identity compare) in addition to = (contents compare). |
|
582 |
Beside this, Symbols behave mostly like Strings. |
|
583 |
||
584 |
Notice, that not all Smalltalk implementations support this kind of symbols.' |
|
796 | 585 |
]. |
49 | 586 |
|
796 | 587 |
^ 'is a symbol. |
49 | 588 |
|
589 |
Symbols are unique strings, meaning that there exists |
|
590 |
exactly one instance of a given symbol. Therefore symbols can |
|
591 |
be compared using == (identity compare) in addition to = (contents compare). |
|
592 |
Beside this, Symbols behave mostly like Strings.' |
|
593 |
]. |
|
594 |
||
595 |
"/ is it a symbol without hash-character ? |
|
596 |
"/ |
|
796 | 597 |
"/ string knownAsSymbol ifTrue:[ |
598 |
"/ ^ 'is nothing, but #' , string , ' is known as a symbol. |
|
599 |
"/ |
|
600 |
"/Symbols are unique strings, meaning that there exists |
|
601 |
"/exactly one instance of a given symbol. Therefore symbols can |
|
602 |
"/be compared using == (identity compare) in addition to = (contents compare). |
|
603 |
"/Beside this, Symbols behave mostly like Strings.' |
|
604 |
"/ ]. |
|
49 | 605 |
|
606 |
^ nil |
|
796 | 607 |
|
608 |
"Modified: / 31.10.1998 / 14:28:58 / cg" |
|
141 | 609 |
! ! |
49 | 610 |
|
396 | 611 |
!Explainer class methodsFor:'documentation'! |
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Claus Gittinger <cg@exept.de>
parents:
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|
612 |
|
3d407ab8ac44
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Claus Gittinger <cg@exept.de>
parents:
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|
613 |
version |
913 | 614 |
^ '$Header: /cvs/stx/stx/libcomp/Explainer.st,v 1.35 1999-07-15 16:34:38 cg Exp $' |
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Claus Gittinger <cg@exept.de>
parents:
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|
615 |
! ! |