axxord/src/Lyst.st

Smalltalk createPackage: 'Axxord'!
Object subclass: #Axes
	instanceVariableNames: ''
	package: 'Axxord'!

!Axes class methodsFor: 'parsing'!

parse: message
	| result stack anArray |
	anArray := message tokenize: ' '.
	result := #().
	stack := { result }.
	anArray do: [ :each |
		| asNum inner close |
		close := 0.
		inner := each.
		[ inner notEmpty and: [ inner first = '(' ]] whileTrue: [ inner := inner allButFirst. stack add: (stack last add: #()) ].
		[ inner notEmpty and: [ inner last = ')' ]] whileTrue: [ inner := inner allButLast. close := close + 1 ].
		(inner notEmpty and: [ inner first = '~' ]) ifTrue: [ inner := { inner allButFirst } ].
		asNum := inner isString ifTrue: [ (inner ifEmpty: [ 'NaN' ]) asNumber ] ifFalse: [ inner ].
		asNum = asNum ifTrue: [ stack last add: asNum ] ifFalse: [
			inner ifNotEmpty: [ stack last add: inner ] ].
		close timesRepeat: [ stack removeLast ] ].
	^ result
! !

Object subclass: #Axon
	instanceVariableNames: 'factory'
	package: 'Axxord'!
!Axon commentStamp!
I represent a pub-sub based on a key (called 'aspect').
I manage aspect-block subscriptions (called 'interests') as well as run blocks of dirtied interests.
The interest objects are responsible of decision if the change of an aspect is relevant for them.
Interest object must be subclasses of `AxonInterest`.

My subclasses must provide implementation for:

 - add:
 - do:
 - clean!

!Axon methodsFor: 'action'!

addInterest: anInterest
	self
		add: (anInterest flag; yourself);
		dirty: true
!

changed: anAspect
	| needsToRun |
	needsToRun := false.
	self do: [ :each |
		(each accepts: anAspect) ifTrue: [
			each flag.
			needsToRun := true ]].
	self dirty: needsToRun
!

changedAll
	| needsToRun |
	needsToRun := false.
	self do: [ :each |
		each flag.
		needsToRun := true ].
	self dirty: needsToRun
!

dirty: aBoolean
	aBoolean ifTrue: [[ self run ] fork]
!

run
	[
		| needsClean |
	    needsClean := false.
		self do: [ :each |
			each isFlagged ifTrue: [ each run ].
	        each isEnabled ifFalse: [ needsClean := true ]
		].
    	needsClean ifTrue: [ self clean ]
	] on: Error do: [ self dirty: true ]
! !

!Axon methodsFor: 'injecting'!

registerIn: anObject
<inlineJS: 'anObject.$axon$=self'>
! !

Axon subclass: #DumbAxon
	instanceVariableNames: ''
	package: 'Axxord'!
!DumbAxon commentStamp!
I am an axon that does nothing.!

!DumbAxon methodsFor: 'as yet unclassified'!

add: anInterest
	"pass"
!

clean
	"pass"
!

do: aBlock
	"pass"
! !

Axon subclass: #SimpleAxon
	instanceVariableNames: 'queue'
	package: 'Axxord'!

!SimpleAxon methodsFor: 'accessing'!

add: aSubscription
	queue add: aSubscription.
! !

!SimpleAxon methodsFor: 'bookkeeping'!

clean
	queue := queue select: [ :each | each isEnabled ]
! !

!SimpleAxon methodsFor: 'enumeration'!

do: aBlock
	queue do: aBlock
! !

!SimpleAxon methodsFor: 'initialization'!

initialize
    super initialize.
	queue := OrderedCollection new
! !

Object subclass: #AxonInterest
	instanceVariableNames: 'aspect actionBlock flagged'
	package: 'Axxord'!

!AxonInterest methodsFor: 'accessing'!

aspect: anAspect block: aBlock
	aspect := anAspect.
    actionBlock := aBlock
!

flag
	flagged := true
! !

!AxonInterest methodsFor: 'action'!

run
	[ flagged := false. actionBlock value ]
    on: AxonOff do: [ actionBlock := nil ]
! !

!AxonInterest methodsFor: 'initialization'!

initialize
	super initialize.
    aspect := nil.
    actionBlock := nil.
    flagged := false.
! !

!AxonInterest methodsFor: 'testing'!

accepts: anAspect
    "Should return true if change for anAspect is relevant for this AxonInterest"
    self subclassResponsibility
!

isEnabled
	^actionBlock notNil
!

isFlagged
	^flagged
! !

AxonInterest subclass: #InterestedInEqual
	instanceVariableNames: ''
	package: 'Axxord'!

!InterestedInEqual methodsFor: 'testing'!

accepts: anAspect
    ^ anAspect = aspect
! !

Error subclass: #AxonOff
	instanceVariableNames: ''
	package: 'Axxord'!
!AxonOff commentStamp!
Signal me from the subscription block to unsubscribe it.!

!Array methodsFor: '*Axxord'!

asAxisIn: anObject ifAbsent: aBlock
	| receiver selector result |
	selector := self first.
	receiver := anObject yourself. "JSObjectProxy hack"
	
	[ result := receiver perform: selector ]
	on: MessageNotUnderstood do: [ :mnu |
		((mnu message selector = selector
			and: [ mnu receiver == receiver ])
			and: [ mnu message arguments isEmpty ])
			ifFalse: [ mnu resignal ].
		^ aBlock value ].
	^ result
!

asAxisIn: anObject ifAbsent: aBlock put: anotherObject
	| receiver selector arguments result |
	selector := self first asMutator.
	receiver := anObject yourself. "JSObjectProxy hack"
	arguments := { anotherObject }.
	
	[ result := receiver perform: selector withArguments: arguments ]
	on: MessageNotUnderstood do: [ :mnu |
		((mnu message selector = selector
			and: [ mnu receiver == receiver ])
			and: [ mnu message arguments = arguments ])
			ifFalse: [ mnu resignal ].
		^ aBlock value ].
	^ result
! !

!Number methodsFor: '*Axxord'!

asAxisIn: anObject ifAbsent: aBlock
	(anObject respondsTo: #at:ifAbsent:)
		ifTrue: [ ^ anObject at: self ifAbsent: aBlock ]
		ifFalse: aBlock
!

asAxisIn: anObject ifAbsent: aBlock put: anotherObject
	(anObject respondsTo: #at:put:)
		ifTrue: [ ^ anObject at: self put: anotherObject ]
		ifFalse: aBlock
! !

!Object methodsFor: '*Axxord'!

asAxisIn: anObject ifAbsent: aBlock
	^ aBlock value
!

asAxisIn: anObject ifAbsent: aBlock put: anotherObject
	^ aBlock value
!

atAxes: aCollection ifAbsent: aBlock
	^ aCollection inject: self into: [ :soFar :segment |
		segment asAxisIn: soFar ifAbsent: [ ^ aBlock value ]]
!

atAxes: aCollection ifAbsent: aBlock put: value
	| penultimate |
	penultimate := self atLyst: aCollection allButLast ifAbsent: aBlock.
	^ aCollection last asAxisIn: penultimate ifAbsent: aBlock put: value
!

axes: aCollection consume: aBlock
	| value |
	value := self atLyst: aCollection ifAbsent: [ ^self ].
	^ aBlock value: value
!

axes: aCollection transform: aBlock
	| value |
	aCollection last. "raise if empty"
	value := self atLyst: aCollection ifAbsent: [ ^self ].
	value := aBlock value: value.
	value := self atLyst: aCollection ifAbsent: [ ^self ] put: value.
	self registeredAxon ifNotNil: [:axon | axon changed: aCollection]
!

registeredAxon
<inlineJS: 'return self.$axon$'>
! !

!String methodsFor: '*Axxord'!

asAxisIn: anObject ifAbsent: aBlock
	(anObject respondsTo: #at:ifAbsent:)
		ifTrue: [ ^ anObject at: self ifAbsent: aBlock ]
		ifFalse: aBlock
!

asAxisIn: anObject ifAbsent: aBlock put: anotherObject
	(anObject respondsTo: #at:put:)
		ifTrue: [ ^ anObject at: self put: anotherObject ]
		ifFalse: aBlock
! !