"

 COPYRIGHT (c) 2006 by eXept Software AG

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libbasic' }"

Object subclass:#ProgrammingLanguage

	instanceVariableNames:''

	classVariableNames:'LanguageQuerySignal'

	poolDictionaries:''

	category:'Kernel-Languages'

!

ProgrammingLanguage class instanceVariableNames:'Instance'

"

 No other class instance variables are inherited by this class.

"

!

!ProgrammingLanguage class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 2006 by eXept Software AG

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    provide info about which tools are to be used for code in

    a programming language

"

! !

!ProgrammingLanguage class methodsFor:'initialization'!

initialize

     LanguageQuerySignal := 

            QuerySignal new

                nameClass:self message:#languageQuerySignal;

                notifierString:'asking for current language';

                handlerBlock:[:ex | ex proceedWith:SmalltalkLanguage instance].

    "Created: / 12-08-2009 / 14:56:11 / Jan Vrany <vranyj1@fel.cvut.cz>"

    "Modified: / 16-08-2009 / 10:36:11 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage class methodsFor:'instance creation'!

forFile: aFilename 

    "Answers a language for given source file. If none is found,

     SmalltalkLanguage is returned (to provide backward compatibility)"

    ^ self instancesDetect: [:each | each canReadSourceFile: aFilename ]

        ifNone: [ SmalltalkLanguage instance ]

    "Created: / 16-08-2009 / 10:08:44 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

forStream: aStream 

    "Answers a language for given source stream. If none is found,

     SmalltalkLanguage is returned (to provide backward compatibility)"

    aStream isFileStream ifFalse: [ ^ SmalltalkLanguage instance ].

    ^ self forFile: aStream fileName

    "Created: / 16-08-2009 / 10:56:26 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

named: aString 

    ^ self named:aString ifNone:[ self error: 'No language named ' , aString ].

    "

     ProgrammingLanguage named: 'Smalltalk'

     ProgrammingLanguage named: 'JavaScript' 

     ProgrammingLanguage named: 'Ruby'

    "

    "Created: / 15-08-2009 / 22:40:26 / Jan Vrany <vranyj1@fel.cvut.cz>"

    "Modified: / 16-08-2009 / 10:58:01 / Jan Vrany <vranyj1@fel.cvut.cz>"

    "Modified: / 04-08-2010 / 12:06:38 / cg"

!

named: aString ifNone: aBlock

    ^ self 

        instancesDetect:[:each | each name = aString ]

        ifNone: aBlock

    "Created: / 21-08-2009 / 13:07:10 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage class methodsFor:'Signal constants'!

languageQuerySignal

    ^LanguageQuerySignal

    "Created: / 12-08-2009 / 14:57:07 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage class methodsFor:'accessing'!

all

    "

    Anwers a collection of all available languages

    "        

    ^self allSubclasses collect:[:each|each instance]

    "

     ProgrammingLanguage all

    "

    "Created: / 16-08-2009 / 13:43:41 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

current

    "

     ProgrammingLanguage current

    "

    ^LanguageQuerySignal query

    "Created: / 12-08-2009 / 15:02:59 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

instance

    "return this languages singleton"

    Instance isNil ifTrue:[Instance := self new].

    ^Instance

    "Created: / 16-08-2009 / 10:36:37 / Jan Vrany <vranyj1@fel.cvut.cz>"

    "Modified: / 18-11-2011 / 14:51:59 / cg"

! !

!ProgrammingLanguage class methodsFor:'enumerating'!

allDetect:aBlock ifNone:exceptionValue

    self allDo:[:each | (aBlock value:each) ifTrue:[^ each]].

    ^ exceptionValue value

!

allDo: aBlock

    ^ self allSubclassesDo: [:each | aBlock value: each instance]

    "Created: / 16-08-2009 / 14:07:40 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage class methodsFor:'private'!

instancesDetect: detectBlock ifNone: failBlock

    self allSubclasses 

        do:[:cls|(detectBlock value: cls instance) ifTrue:[^cls instance]].

    ^failBlock value

    "Created: / 16-08-2009 / 10:57:32 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage class methodsFor:'testing'!

isAvailable: langName

    self instancesDetect: [:lang|lang name = langName] ifNone: [^false].

    ^true

    "

        ProgrammingLanguage isAvailable: 'Smalltalk' 

        ProgrammingLanguage isAvailable: 'Ruby'  

        ProgrammingLanguage isAvailable: 'Haskell'   

    "

    "Created: / 21-08-2009 / 12:56:32 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage methodsFor:'accessing'!

id

    "Return an unique integer id of this language.

     id must be < 32.

     This id is used as index to various structures used by runtime"

    ^self subclassResponsibility

    "Created: / 17-03-2011 / 10:51:35 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

imports

    "To make it polymorph with NameSpace for

     selector-namespace enabled systems"

    ^self class all reject:[:lang|lang == self]

    "Created: / 20-05-2010 / 14:17:35 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 19-07-2010 / 12:14:20 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

lookup

    ^self lookupClass instance

    "Created: / 17-03-2011 / 10:57:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

name

    "Answers a human-readable name of myself:

     'Smalltalk' for SmalltalkLanguage,

     'Ruby' for RubyLanguage

     ...

    "

    ^ self subclassResponsibility

    "Created: / 15-08-2009 / 22:38:16 / Jan Vrany <vranyj1@fel.cvut.cz>"

    "Modified: / 16-08-2009 / 10:47:21 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

sourceFileSuffix

    "Answers a default suffix for source files, i.e. 'st' for Smalltalk, 

     'js' for JavaScript or 'rb' for Ruby', etc."

    ^self subclassResponsibility

    "Created: / 16-08-2009 / 10:42:40 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage methodsFor:'accessing - classes'!

codeGeneratorClass

    "Answer a class suitable for generating code (such as getters, setters, etc.)

     It is ok to return nil, which means that no code can be generated automagically"

    ^ nil

!

compilerClass

    "Answer a class suitable for compiling a source code in 'my' language"

    ^self subclassResponsibility

    "Created: / 21-08-2009 / 13:00:50 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

evaluatorClass

    "Answer a class suitable for evaluating a doIt in 'my' language"

    ^ self compilerClass

!

explainerClass

    "Answers a class used by browser and debugger to

     show some hints about the code. It is OK to return

     nil, which means that there is no explainer for given

     language."

    "return nil by default"

    ^nil

    "Created: / 21-08-2009 / 08:49:13 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

formatterClass

    "Answer a class suitable for prettyPrinting (indenting) code in 'my' language.

     It is ok to return nil, which means that the browser will not be able to prettyprint."

    ^ nil

!

lookupClass

    ^BuiltinLookup

    "Created: / 17-03-2011 / 10:56:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

metaClass

    "will be used for new classes (in the class wizard);

     a fallback here"

    ^ Metaclass

    "Created: / 30-01-2011 / 10:05:03 / cg"

!

parserClass

    "Answer a class suitable for parsing a source code in 'my' language"

    ^self subclassResponsibility

    "Created: / 21-08-2009 / 13:00:30 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

sourceFileReaderClass

    "Answers a class that can be used for reading & compiling source files"

    ^self subclassResponsibility

    "Created: / 16-08-2009 / 09:00:23 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

sourceFileWriterClass

    "Answers a class is used for source file writing (i.e. file-out)"

    ^self subclassResponsibility

    "Created: / 16-08-2009 / 09:40:19 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

syntaxHighlighterClass

    "Answers a class used by browser and debugger to colorze code.

     It is OK to return nil, which means that the code is shown as-is"

    "return nil by default"

    ^nil

! !

!ProgrammingLanguage methodsFor:'printing & storing'!

printOn:aStream

    "append a printed representation if the receiver to the argument, aStream"

    self class printOn: aStream.

    aStream nextPutAll: ' instance'

    "Modified: / 19-06-2010 / 09:54:04 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

storeOn:aStream

    self class == ProgrammingLanguage 

        ifTrue:

            [super storeOn:aStream]

        ifFalse:

            [aStream 

                nextPutAll:'ProgrammingLanguage';

                nextPutAll:' named: ';

                nextPutAll:self name storeString].

    "

        ProgrammingLanguage instance storeString  

        SmalltalkLanguage instance storeString 

    "

    "Created: / 16-08-2009 / 10:52:28 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage methodsFor:'queries'!

canReadSourceFile: aFilename

    "Answers true iff file contains source code in 'my' language"

    "Trivial implementation here, to be overriden by subclasses"

    ^aFilename suffix = self sourceFileSuffix

    "Created: / 16-08-2009 / 10:10:33 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

supportsExtensionMethods

    "Answer true iff this language supports extension methods"

    ^true

    "Created: / 19-03-2011 / 10:02:46 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!ProgrammingLanguage methodsFor:'testing'!

isJava

    "true iff this is the Java language"

    ^ false

    "Created: / 17-03-2011 / 10:16:23 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

isProgrammingLanguage

    ^true

    "Created: / 21-07-2010 / 15:14:06 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

isRuby

    "true iff this is the ruby language"

    ^ false

!

isSTXJavaScript

    "true iff this is the ST/X-javascript language"

    ^ false

!

isSmalltalk

    "true iff this is the smalltalk language"

    ^ false

    "Created: / 16-08-2009 / 09:01:27 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage methodsFor:'utilities - file in/file out'!

fileIn: aFilename

    ^self sourceFileReaderClass fileIn: aFilename

    "Created: / 16-08-2009 / 13:28:17 / Jan Vrany <vranyj1@fel.cvut.cz>"

!

fileInStream: aStream

    ^self sourceFileReaderClass fileInStream: aStream

    "Created: / 16-08-2009 / 11:05:46 / Jan Vrany <vranyj1@fel.cvut.cz>"

! !

!ProgrammingLanguage methodsFor:'utilities - source code'!

classTemplateFor: superClass in: category asNamespace: isNamespace private: isPrivate

    "Returns a class template code"

    ^String streamContents:[:code|

        self 

            writeComment: (StringCollection

                with: 'No class template defined. Please define one in '

                with: (self class name , '>>', thisContext selector))

            on: code

    ]

    "Modified: / 18-02-2012 / 18:31:09 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

methodTemplate