"

 COPYRIGHT (c) 1996 by Claus Gittinger

              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.

"

Object subclass:#Namespace

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'Kernel-Classes'

!

!Namespace class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1996 by Claus Gittinger

              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

"

    A Namespace is actually a dummy class, providing a home

    for its private classes. 

    Thus, internally, the same mechanism is used for classes in

    a namespace and private classes.

    This has two advantages:

        - we only need one mechanism for both namespaces

          and private classes

        - there are no possible conflicts between a class

          and a namespace named alike.

    [author:]

        Claus Gittinger

    [see also:]

        Behavior ClassDescription Class Metaclass

        PrivateMetaclass

"

! !

!Namespace class methodsFor:'instance creation'!

fullName:aFullNameSpacePathName

    "given a possibly nested name of a namespace, create all required

     intermediate spaces (if not already existing) and return the

     bottom-level space."

    "/ break it up, check for all intermediate spaces to exist

    "/ create them as required.

    |list idx0 idx superSpace done thisNamespace|

    list := OrderedCollection new.

    idx0 := 1.

    done := false.

    [done] whileFalse:[

        idx := aFullNameSpacePathName indexOf:$: startingAt:idx0.

        (idx ~~ 0) ifTrue:[

            (idx < aFullNameSpacePathName size and:[(aFullNameSpacePathName at:(idx+1)) == $:]) ifTrue:[

                superSpace := aFullNameSpacePathName copyFrom:idx0 to:(idx-1).

                list add:superSpace.

                idx0 := idx +2.

            ] ifFalse:[

                done := true

            ]

        ] ifFalse:[

            done := true.

        ]

    ].

    list add:(aFullNameSpacePathName copyFrom:idx0).

    "/ now, look and create 'em

    thisNamespace := nil.

    list do:[:aName |

        |key x|

        key := aName asSymbol.

        thisNamespace isNil ifTrue:[

            (Smalltalk includesKey:key) ifTrue:[

                thisNamespace := Smalltalk at:key.

                (thisNamespace notNil

                and:[thisNamespace isBehavior not]) ifTrue:[

                    ^ self error:'name conflict: namespace ' , aName , ' vs. global'.

                ]

            ].

            thisNamespace isNil ifTrue:[

                thisNamespace := self name:key

            ]

        ] ifFalse:[

            x := thisNamespace privateClassesAt:key.

            x notNil ifTrue:[

                thisNamespace := x

            ] ifFalse:[

                thisNamespace :=

                    self subclass:key

                       instanceVariableNames:''

                       classVariableNames:''

                       poolDictionaries:''

            ]    

        ]

    ].

    ^ thisNamespace

    "Created: 8.11.1996 / 13:41:59 / cg"

!

name:aStringOrSymbol

    "create a new nameSpace, named aStringOrSymbol"

    |newNamespace existing ok|

    ok := aStringOrSymbol first isLetter.

    ok ifTrue:[

        2 to:aStringOrSymbol size do:[:idx | |ch|

            ch := aStringOrSymbol at:idx.

            ok ifTrue:[

                ok := ch isLetterOrDigit or:[ch == $_].

            ]

        ]

    ].

    ok ifFalse:[

        self error:'invalid namespace name:''' , aStringOrSymbol printString , ''' (must be a valid identifier)'.

        ^ nil.

    ].

    (existing := Smalltalk at:aStringOrSymbol asSymbol) notNil ifTrue:[

        ^ existing

    ].

    newNamespace := self subclass:aStringOrSymbol asSymbol

                         instanceVariableNames:''

                         classVariableNames:''

                         poolDictionaries:''

                         category:'uncategorized namespace'.

    ^ newNamespace

    "

     Namespace name:'foo'

     (Namespace name:'foo') category:'my name space'

     foo at:#bar put:(Metaclass new new)

    "

!

new

    "catch new - namespaces are not to be created by the user"

    self error:'namespaces are not to be created with new'

    "Modified: 8.11.1996 / 21:38:00 / cg"

! !

!Namespace class methodsFor:'accessing'!

allClasses

    |classes|

    classes := IdentitySet new.

    self allBehaviorsDo:[:aClass | classes add:aClass].

    ^ classes

    "Modified: 20.12.1996 / 15:34:50 / cg"

!

at:classNameSymbol

    "return a class from the namespace defined by the receiver"

    ^ self privateClassesAt:classNameSymbol

    "Modified: 8.11.1996 / 21:39:41 / cg"

!

at:classNameSymbol ifAbsent:exceptionBlock

    "return a class or an alternative

     from the namespace defined by the receiver"

    |cls|

    cls := self privateClassesAt:classNameSymbol.

    cls isNil ifTrue:[

        ^ exceptionBlock value

    ].

    ^ cls

    "Modified: 8.11.1996 / 21:40:01 / cg"

!

at:classNameSymbol put:aClass

    "add a class to the namespace defined by the receiver"

    ^ self privateClassesAt:classNameSymbol put:aClass

    "Modified: 8.11.1996 / 21:40:12 / cg"

! !

!Namespace class methodsFor:'enumerating'!

allBehaviorsDo:aBlock

    "enumerate all classes in this namespace"

    self privateClassesDo:aBlock

    "Created: 26.10.1996 / 12:29:01 / cg"

    "Modified: 8.11.1996 / 21:39:20 / cg"

! !

!Namespace class methodsFor:'fileOut'!

basicFileOutDefinitionOn:aStream

    "redefined to generate another definition message"

    self == Namespace ifTrue:[

        super basicFileOutDefinitionOn:aStream

    ] ifFalse:[

        aStream nextPutAll:('Namespace name:' , self name storeString)

    ]

    "Modified: 8.11.1996 / 21:39:03 / cg"

! !

!Namespace class methodsFor:'printing & storing'!

displayString

    "return a printed represenation - here, a reminder is appended,

     that this is not a regular class"

    self == Namespace ifTrue:[

        ^ super displayString

    ].

    ^ self name , ' (* namespace *)'

    "Created: 8.11.1996 / 21:37:24 / cg"

    "Modified: 20.12.1996 / 15:11:31 / cg"

! !

!Namespace class methodsFor:'queries'!

allNamespaces

    "return a list of all namespaces"

    |set|

    set := IdentitySet with:Smalltalk.

    Smalltalk allBehaviorsDo:[:aClass |

        (aClass isNamespace 

        and:[aClass ~~ Namespace

        and:[aClass ~~ Smalltalk]]) ifTrue:[

            set add:aClass

        ]

    ].

    ^ set

    "Created: 2.1.1997 / 20:17:40 / cg"

! !

!Namespace class methodsFor:'documentation'!

version

! !