Smalltalk createPackage: 'Kernel-Infrastructure'! Object subclass: #AmberBootstrapInitialization slots: {} package: 'Kernel-Infrastructure'! !AmberBootstrapInitialization class methodsFor: 'organization'! organizeClasses Smalltalk classes do: [ :each | each enterOrganization ] ! organizeMethods Smalltalk classes do: [ :eachClass | eachClass definedMethods do: [ :eachMethod | eachMethod methodClass methodOrganizationEnter: eachMethod andLeave: nil ] ] ! ! !AmberBootstrapInitialization class methodsFor: 'public api'! run SmalltalkImage initialize. self organizeClasses; organizeMethods. ^ Smalltalk postLoad ! ! ProtoObject subclass: #JSObjectProxy slots: {#jsObject} package: 'Kernel-Infrastructure'! !JSObjectProxy commentStamp! I handle sending messages to JavaScript objects, making JavaScript object accessing from Amber fully transparent. My instances make intensive use of `#doesNotUnderstand:`. My instances are automatically created by Amber whenever a message is sent to a JavaScript object. ## Usage examples JSObjectProxy objects are instanciated by Amber when a Smalltalk message is sent to a JavaScript object. window alert: 'hello world'. window inspect. (window jQuery: 'body') append: 'hello world' Amber messages sends are converted to JavaScript function calls or object property access _(in this order)_. If n one of them match, a `MessageNotUnderstood` error will be thrown. ## Message conversion rules - `someUser name` becomes `someUser.name` - `someUser name: 'John'` becomes `someUser name = "John"` - `console log: 'hello world'` becomes `console.log('hello world')` - `(window jQuery: 'foo') css: 'background' color: 'red'` becomes `window.jQuery('foo').css('background', 'red')` __Note:__ For keyword-based messages, only the first keyword is kept: `window foo: 1 bar: 2` is equivalent to `window foo: 1 baz: 2`.! !JSObjectProxy methodsFor: 'accessing'! at: aString ! at: aString ifAbsent: aBlock "return the aString property or evaluate aBlock if the property is not defined on the object" ! at: aString ifPresent: aBlock "return the evaluation of aBlock with the value if the property is defined or return nil" ! at: aString ifPresent: aBlock ifAbsent: anotherBlock "return the evaluation of aBlock with the value if the property is defined or return value of anotherBlock" ! at: aString put: anObject ! in: aValuable ^ aValuable value: jsObject ! jsObject ^ jsObject ! removeKey: aString ! ! !JSObjectProxy methodsFor: 'comparing'! = anObject ^ anObject class == self class and: [ JSObjectProxy compareJSObjectOfProxy: self withProxy: anObject ] ! ! !JSObjectProxy methodsFor: 'converting'! asJavaScriptObject "Answers the receiver in a stringify-friendly fashion" ^ jsObject ! ! !JSObjectProxy methodsFor: 'enumerating'! keysAndValuesDo: aBlock ! ! !JSObjectProxy methodsFor: 'printing'! printOn: aStream aStream nextPutAll: self printString ! printString >" : js.toString ? js.toString() : Object.prototype.toString.call(js) '> ! ! !JSObjectProxy methodsFor: 'promises'! catch: aBlock (NativeFunction isNativeFunction: (self at: #then)) ifTrue: [ ^ (TThenable >> #catch:) sendTo: jsObject arguments: {aBlock} ] ifFalse: [ ^ super catch: aBlock ] ! on: aClass do: aBlock (NativeFunction isNativeFunction: (self at: #then)) ifTrue: [ ^ (TThenable >> #on:do:) sendTo: jsObject arguments: {aClass. aBlock} ] ifFalse: [ ^ super on: aClass do: aBlock ] ! then: aBlockOrArray (NativeFunction isNativeFunction: (self at: #then)) ifTrue: [ ^ (TThenable >> #then:) sendTo: jsObject arguments: {aBlockOrArray} ] ifFalse: [ ^ super then: aBlockOrArray ] ! ! !JSObjectProxy methodsFor: 'proxy'! doesNotUnderstand: aMessage ^ (JSObjectProxy lookupProperty: aMessage selector asJavaScriptPropertyName ofProxy: self) ifNil: [ super doesNotUnderstand: aMessage ] ifNotNil: [ :jsSelector | JSObjectProxy forwardMessage: jsSelector withArguments: aMessage arguments ofProxy: self ] ! ! !JSObjectProxy methodsFor: 'streaming'! putOn: aStream aStream nextPutJSObject: jsObject ! ! !JSObjectProxy class methodsFor: 'accessing'! null ! undefined ! ! !JSObjectProxy class methodsFor: 'instance creation'! on: aJSObject | instance | instance := self new. self jsObject: aJSObject ofProxy: instance. ^ instance ! ! !JSObjectProxy class methodsFor: 'proxy'! addObjectVariablesTo: aDictionary ofProxy: aProxy ! associationsOfProxy: aProxy ! compareJSObjectOfProxy: aProxy withProxy: anotherProxy ! forwardMessage: aString withArguments: anArray ofProxy: aProxy ! jsObject: aJSObject ofProxy: aProxy ! lookupProperty: aString ofProxy: aProxy "Looks up a property in JS object. Answer the property if it is present, or nil if it is not present." ! ! Object subclass: #Organizer slots: {#elements} package: 'Kernel-Infrastructure'! !Organizer commentStamp! I represent categorization information. ## API Use `#addElement:` and `#removeElement:` to manipulate instances.! !Organizer methodsFor: 'accessing'! addElement: anObject self elements add: anObject ! elements ^ elements ! removeElement: anObject self elements remove: anObject ifAbsent: [] ! ! !Organizer methodsFor: 'initialization'! initialize super initialize. elements := Set new ! ! Organizer subclass: #ClassOrganizer slots: {#traitOrBehavior} package: 'Kernel-Infrastructure'! !ClassOrganizer commentStamp! I am an organizer specific to classes. I hold method categorization information for classes.! !ClassOrganizer methodsFor: 'accessing'! addElement: aString super addElement: aString. SystemAnnouncer current announce: (ProtocolAdded new protocol: aString; theClass: self theClass; yourself) ! removeElement: aString super removeElement: aString. SystemAnnouncer current announce: (ProtocolRemoved new protocol: aString; theClass: self theClass; yourself) ! theClass ^ traitOrBehavior ! theClass: aClass traitOrBehavior := aClass ! ! !ClassOrganizer class methodsFor: 'instance creation'! on: aClass ^ self new theClass: aClass; yourself ! ! Organizer subclass: #PackageOrganizer slots: {} package: 'Kernel-Infrastructure'! !PackageOrganizer commentStamp! I am an organizer specific to packages. I hold classes categorization information.! Object subclass: #Package slots: {#contextBlock. #basicTransport. #name. #transport. #imports. #dirty. #organization. #isReady} package: 'Kernel-Infrastructure'! !Package commentStamp! I am similar to a "class category" typically found in other Smalltalks like Pharo or Squeak. Amber does not have class categories anymore, it had in the beginning but now each class in the system knows which package it belongs to. Each package has a name and can be queried for its classes, but it will then resort to a reverse scan of all classes to find them. ## API Packages are manipulated through "Smalltalk current", like for example finding one based on a name or with `Package class >> #name` directly: Smalltalk current packageAt: 'Kernel' Package named: 'Kernel' A package differs slightly from a Monticello package which can span multiple class categories using a naming convention based on hyphenation. But just as in Monticello a package supports "class extensions" so a package can define behaviors in foreign classes using a naming convention for method categories where the category starts with an asterisk and then the name of the owning package follows. You can fetch a package from the server: Package load: 'Additional-Examples'! !Package methodsFor: 'accessing'! beClean dirty := false. SystemAnnouncer current announce: (PackageClean new package: self; yourself) ! beDirty dirty := true. SystemAnnouncer current announce: (PackageDirty new package: self; yourself) ! classTemplate ^ String streamContents: [ :stream | stream write: 'Object subclass: #NameOfSubclass'; lf; tab; write: 'instanceVariableNames: '''''; lf; tab; write: 'package: '; print: self name ] ! context ^ self contextBlock ifNil: [ #{} ] ifNotNil: [ :block | | result | result := Dictionary new. block value keysAndValuesDo: [ :key :value | result at: key put: value ]. result ] ! contextBlock ^ contextBlock ! contextBlock: aBlock contextBlock := aBlock ! contextFunctionSource ^ (self imports reject: #isString) ifEmpty: [ nil ] ifNotEmpty: [ :namedImports | 'function () { return {', (',' join: (namedImports collect: [ :each | each key, ':', each key ])), '}; }' ] ! definition ^ String streamContents: [ :stream | stream write: self class name; lf; tab; write: 'named: '; print: self name; lf; tab; write: { 'imports: '. self importsDefinition }; lf; tab; write: { 'transport: ('. self transport definition. ')' } ] ! imports ^ imports ifNil: [ self imports: #(). imports ] ! imports: anArray self validateImports: anArray. imports := anArray asSet ! importsDefinition ^ String streamContents: [ :stream | stream write: '{'. self sortedImportsAsArray do: [ :each | stream print: each ] separatedBy: [ stream write: '. ' ]. stream write: '}' ] ! isReady ^ isReady ! isReady: aPromise isReady := aPromise ! javaScriptDescriptor: anObject | basicEval basicContext basicImports | basicImports := anObject at: 'imports' ifAbsent: [ #() ]. self imports: (self importsFromJson: basicImports). basicTransport := anObject at: 'transport' ifAbsent: []. anObject at: 'isReady' ifPresent: [ :aPromise | self isReady: aPromise ]. "TODO remove, backward compatibility" anObject at: 'innerEval' ifPresent: [ :evalBlock | self contextFunctionSource ifNotNil: [ :source | anObject at: 'context' put: (evalBlock value: '(', source, ')') ] ]. basicContext := anObject at: 'context' ifAbsent: [ nil asJavaScriptObject ]. self contextBlock: basicContext ! name ^ name ! name: aString name := aString ! organization ^ organization ! transport ^ transport ifNil: [ self transport: (PackageTransport fromJson: self basicTransport). transport ] ! transport: aPackageTransport transport := aPackageTransport. aPackageTransport package: self ! ! !Package methodsFor: 'classes'! classes ^ self organization elements copy ! setupClasses self classes do: [ :each | each initialize ] ! sortedClasses "Answer all classes in the receiver, sorted by superclass/subclasses and by class name for common subclasses (Issue #143)." ^ self class sortedClasses: self classes ! ! !Package methodsFor: 'converting'! importsAsJson ^ self sortedImportsAsArray collect: [ :each | each isString ifTrue: [ each ] ifFalse: [ each key, '=', each value ]] ! importsFromJson: anArray "Parses array of string, eg. #('asdf' 'qwer=tyuo') into array of Strings and Associations, eg. {'asdf'. 'qwer'->'tyuo'}" ^ anArray collect: [ :each | | split | split := each tokenize: '='. split size = 1 ifTrue: [ split first ] ifFalse: [ split first -> split second ]] ! ! !Package methodsFor: 'dependencies'! loadDependencies "Returns list of packages that need to be loaded before loading this package." | classes packages | classes := self loadDependencyClasses. ^ (classes collect: [ :each | each package ]) asSet remove: self ifAbsent: []; yourself ! loadDependencyClasses "Returns classes needed at the time of loading a package. These are all that are used to subclass and to define an extension method as well as all traits used" | starCategoryName | starCategoryName := '*', self name. ^ (self classes collect: [ :each | each superclass ]) asSet addAll: (Smalltalk classes select: [ :each | ({each. each theMetaClass} copyWithout: nil) anySatisfy: [ :any | (any protocols includes: starCategoryName) and: [ (any ownMethodsInProtocol: starCategoryName) notEmpty ]]]); addAll: (Array streamContents: [ :as | self traitCompositions valuesDo: [ :each | as write: (each collect: [ :eachTT | eachTT trait ])]]); remove: nil ifAbsent: []; yourself ! traitCompositions | traitCompositions | traitCompositions := Dictionary new. self classes do: [ :eachClass | eachClass includingPossibleMetaDo: [ :each | traitCompositions at: each put: each traitComposition ] ]. ^ traitCompositions reject: [ :each | each isEmpty ] ! ! !Package methodsFor: 'initialization'! initialize super initialize. organization := PackageOrganizer new. contextBlock := nil. dirty := nil. imports := nil. isReady := Promise new. transport := nil ! ! !Package methodsFor: 'printing'! printOn: aStream super printOn: aStream. aStream nextPutAll: ' ('; nextPutAll: self name; nextPutAll: ')' ! ! !Package methodsFor: 'private'! basicTransport "Answer the transport literal JavaScript object as setup in the JavaScript file, if any" ^ basicTransport ! sortedImportsAsArray "Answer imports sorted first by type (associations first), then by value" ^ self imports asArray sorted: [ :a :b | a isString not & b isString or: [ a isString = b isString and: [ a value <= b value ]]] ! ! !Package methodsFor: 'testing'! isDirty ^ dirty ifNil: [ false ] ! isPackage ^ true ! ! !Package methodsFor: 'validation'! validateImports: aCollection aCollection do: [ :import | import isString ifFalse: [ (import respondsTo: #key) ifFalse: [ self error: 'Imports must be Strings or Associations' ]. import key isString & import value isString ifFalse: [ self error: 'Key and value must be Strings' ]. (import key match: '^[a-zA-Z][a-zA-Z0-9]*$') ifFalse: [ self error: 'Keys must be identifiers' ]]] ! ! Package class slots: {#defaultCommitPathJs. #defaultCommitPathSt}! !Package class methodsFor: 'accessing'! named: aPackageName ^ Smalltalk packageAt: aPackageName ifAbsent: [ Smalltalk createPackage: aPackageName ] ! named: aPackageName ifAbsent: aBlock ^ Smalltalk packageAt: aPackageName ifAbsent: aBlock ! named: aPackageName imports: anArray transport: aTransport | pkg | pkg := self named: aPackageName. pkg imports: anArray; transport: aTransport; beDirty. ^ pkg ! named: aPackageName transport: aTransport | pkg | pkg := self named: aPackageName. pkg transport: aTransport; beDirty. ^ pkg ! ! !Package class methodsFor: 'instance creation'! named: aString javaScriptDescriptor: anObject | pkg | pkg := Smalltalk createPackage: aString. pkg javaScriptDescriptor: anObject. ^ pkg ! new: aString ^ Package new name: aString; yourself ! ! !Package class methodsFor: 'sorting'! sortedClasses: classes ^ Array streamContents: [ :stream | stream << (ClassBuilder sortClasses: classes) ] ! ! Object subclass: #PackageStateObserver slots: {} package: 'Kernel-Infrastructure'! !PackageStateObserver commentStamp! My current instance listens for any changes in the system that might affect the state of a package (being dirty).! !PackageStateObserver methodsFor: 'accessing'! announcer ^ SystemAnnouncer current ! ! !PackageStateObserver methodsFor: 'actions'! observeSystem self announcer on: PackageAdded send: #onPackageAdded: to: self; on: ClassAnnouncement send: #onClassModification: to: self; on: MethodAnnouncement send: #onMethodModification: to: self ! ! !PackageStateObserver methodsFor: 'reactions'! onClassModification: anAnnouncement anAnnouncement theClass ifNotNil: [ :theClass | theClass package beDirty ] ! onMethodModification: anAnnouncement anAnnouncement method package ifNotNil: [ :package | package beDirty ] ! onPackageAdded: anAnnouncement anAnnouncement package beDirty ! ! PackageStateObserver class slots: {#current}! !PackageStateObserver class methodsFor: 'accessing'! current ^ current ifNil: [ current := self new ] ! ! !PackageStateObserver class methodsFor: 'initialization'! initialize self current observeSystem ! ! Object subclass: #Setting slots: {#key. #defaultValue} package: 'Kernel-Infrastructure'! !Setting commentStamp! I represent a setting **stored** at `Smalltalk settings`. In the current implementation, `Smalltalk settings` is an object persisted in the localStorage. ## API A `Setting` value can be read using `value` and set using `value:`. Settings are accessed with `'key' asSetting` or `'key' asSettingIfAbsent: aDefaultValue`. To read the value of a setting you can also use the convenience: `theValueSet := 'any.characteristic' settingValue` or with a default using: `theEnsuredValueSet := 'any.characteristic' settingValueIfAbsent: true`! !Setting methodsFor: 'accessing'! defaultValue ^ defaultValue ! defaultValue: aStringifiableObject defaultValue := aStringifiableObject ! key ^ key ! key: aString key := aString ! value ^ Smalltalk settings at: self key ifAbsent: [ self defaultValue ] ! value: aStringifiableObject ^ Smalltalk settings at: self key put: aStringifiableObject ! ! !Setting class methodsFor: 'instance creation'! at: aString ifAbsent: aDefaultValue ^ super new key: aString; defaultValue: aDefaultValue; yourself ! new self shouldNotImplement ! ! Object subclass: #SmalltalkImage slots: {#globalJsVariables. #packageDictionary} package: 'Kernel-Infrastructure'! !SmalltalkImage commentStamp! I represent the Smalltalk system, wrapping operations of variable `$core` declared in `base/boot.js`. ## API I have only one instance, accessed with global variable `Smalltalk`. ## Classes Classes can be accessed using the following methods: - `#classes` answers the full list of Smalltalk classes in the system - `#globals #at:` answers a specific global (usually, a class) or `nil` ## Packages Packages can be accessed using the following methods: - `#packages` answers the full list of packages - `#packageAt:` answers a specific package or `nil` ## Parsing The `#parse:` method is used to parse Amber source code. It requires the `Compiler` package and the `base/parser.js` parser file in order to work.! !SmalltalkImage methodsFor: 'accessing'! cancelOptOut: anObject "A Smalltalk object has a 'a$cls' property. If this property is shadowed for anObject by optOut:, the object is treated as plain JS object. This removes the shadow and anObject is Smalltalk object again if it was before." ! core ! globals ! optOut: anObject "A Smalltalk object has a 'a$cls' property. This shadows the property for anObject. The object is treated as plain JS object following this." ! parse: aString ^ Compiler new parse: aString ! pseudoVariableNames ^ Compiler pseudoVariableNames ! readJSObject: anObject ! reservedWords ^ #( "http://www.ecma-international.org/ecma-262/6.0/#sec-keywords" break case catch class const continue debugger default delete do else export extends finally for function if import in instanceof new return super switch this throw try typeof var void while with yield "in strict mode" let static "Amber protected words: these should not be compiled as-is when in code" arguments "http://www.ecma-international.org/ecma-262/6.0/#sec-future-reserved-words" await enum "in strict mode" implements interface package private protected public ) ! settings ^ SmalltalkSettings ! version "Answer the version string of Amber" ^ '0.29.3-pre' ! ! !SmalltalkImage methodsFor: 'accessing amd'! amdRequire ^ self core at: 'amdRequire' ! defaultAmdNamespace ^ 'transport.defaultAmdNamespace' settingValue ! defaultAmdNamespace: aString 'transport.defaultAmdNamespace' settingValue: aString ! ! !SmalltalkImage methodsFor: 'classes'! classes ^ self core traitsOrClasses copy ! removeClass: aClass aClass isMetaclass ifTrue: [ self error: aClass asString, ' is a Metaclass and cannot be removed!!' ]. aClass allSubclassesDo: [ :subclass | self error: aClass name, ' has a subclass: ', subclass name ]. aClass traitUsers ifNotEmpty: [ self error: aClass name, ' has trait users.' ]. self deleteClass: aClass. aClass includingPossibleMetaDo: [ :each | each setTraitComposition: #() ]. SystemAnnouncer current announce: (ClassRemoved new theClass: aClass; yourself) ! ! !SmalltalkImage methodsFor: 'error handling'! asSmalltalkException: anObject "A JavaScript exception may be thrown. We then need to convert it back to a Smalltalk object" ^ anObject ifNil: [ [ self error: 'Error: nil' ] on: Error do: [ :e | e ] ] ifNotNil: [ (self isError: anObject) ifTrue: [ anObject ] ifFalse: [ JavaScriptException on: anObject ] ] ! try: actionBlock ifTrue: aBlock catch: anotherBlock "Similar to BlockClosure >> tryifTrue:catch:, but converts all JS exceptions to JavaScriptException instances." | smalltalkError | ^ actionBlock tryIfTrue: [ :error | smalltalkError := self asSmalltalkException: error. aBlock value: smalltalkError ] catch: [ anotherBlock value: smalltalkError ] ! ! !SmalltalkImage methodsFor: 'globals'! addGlobalJsVariable: aString self globalJsVariables add: aString ! deleteGlobalJsVariable: aString self globalJsVariables remove: aString ifAbsent:[] ! globalJsVariables ^ globalJsVariables ifNil: [ globalJsVariables := #(window document process global) ] ! ! !SmalltalkImage methodsFor: 'image'! postFailedLoad: aPackage | keys descriptors | Smalltalk removePackage: aPackage name. keys := Set new. descriptors := self core packageDescriptors. descriptors keysAndValuesDo: [ :key :value | keys add: key ]. keys do: [ :each | Smalltalk removePackage: each. descriptors removeKey: each ] ! postLoad ^ self adoptPackageDescriptors then: [ :pkgs | | classes | pkgs do: #beClean. classes := Smalltalk classes select: [ :each | pkgs includes: each package ]. classes do: [ :each | each = self class ifFalse: [ each initialize ] ]. self sweepPackageDescriptors: pkgs ] ! ! !SmalltalkImage methodsFor: 'packages'! beClean "Marks all packages clean." self packages do: #beClean ! createPackage: packageName | package announcement | package := self basicCreatePackage: packageName. announcement := PackageAdded new package: package; yourself. SystemAnnouncer current announce: announcement. ^ package ! packageAt: packageName ifAbsent: aBlock ^ self packageDictionary at: packageName ifAbsent: aBlock ! packageAt: packageName ifPresent: aBlock ^ self packageDictionary at: packageName ifPresent: aBlock ! packageDictionary ^ packageDictionary ifNil: [ packageDictionary := Dictionary new ] ! packages "Return all Package instances in the system." ^ self packageDictionary values copy ! removePackage: packageName "Removes a package and all its classes." | pkg | pkg := self packageAt: packageName ifAbsent: [ self error: 'Missing package: ', packageName ]. pkg classes do: [ :each | self removeClass: each ]. self packageDictionary removeKey: packageName. SystemAnnouncer current announce: (PackageRemoved new package: pkg; yourself) ! renamePackage: packageName to: newName "Rename a package." | pkg | pkg := self packageAt: packageName ifAbsent: [ self error: 'Missing package: ', packageName ]. self packageAt: newName ifPresent: [ self error: 'Already exists a package called: ', newName ]. pkg name: newName; beDirty. self packageDictionary at: newName put: pkg; removeKey: packageName ! ! !SmalltalkImage methodsFor: 'private'! adoptPackageDescriptors ^ self tryAdoptPackageDescriptorsBeyond: Set new ! basicCreatePackage: packageName "Create and bind a new bare package with given name and return it." ^ self packageDictionary at: packageName ifAbsentPut: [ Package new: packageName ] ! deleteClass: aClass "Deletes a class by deleting its binding only. Use #removeClass instead" ! sweepPackageDescriptors: pkgs | pd | pd := self core packageDescriptors. pkgs do: [ :each | pd removeKey: each name ] ! tryAdoptPackageDescriptorsBeyond: aSet | original | original := aSet copy. self core packageDescriptors keysAndValuesDo: [ :key :value | aSet add: (Package named: key javaScriptDescriptor: value) ]. ^ (aSet allSatisfy: [ :each | original includes: each ]) ifFalse: [ (Promise all: (aSet collect: #isReady)) then: [ self tryAdoptPackageDescriptorsBeyond: aSet ] ] ifTrue: [ Promise value: aSet ] ! ! !SmalltalkImage methodsFor: 'testing'! existsJsGlobal: aString self deprecatedAPI: 'Use Platform >> includesGlobal: instead'. ^ Platform includesGlobal: aString ! isError: anObject ^ (self isSmalltalkObject: anObject) and: [ anObject isError ] ! isSmalltalkObject: anObject "Consider anObject a Smalltalk object if it has a 'a$cls' property. Note that this may be unaccurate" ! ! SmalltalkImage class slots: {#current}! !SmalltalkImage class methodsFor: 'initialization'! initialize | st | st := self current. st globals at: 'Smalltalk' put: st ! ! !SmalltalkImage class methodsFor: 'instance creation'! current ^ current ifNil: [ current := super new ] ifNotNil: [ self deprecatedAPI. current ] ! new self shouldNotImplement ! ! JSObjectProxy setTraitComposition: {TIsInGroup. TThenable} asTraitComposition! ! ! !ProtoStream methodsFor: '*Kernel-Infrastructure'! nextPutJSObject: aJSObject self nextPut: aJSObject ! ! !String methodsFor: '*Kernel-Infrastructure'! asJavaScriptPropertyName ! asSetting "Answer aSetting dedicated to locally store a value using this string as key. Nil will be the default value." ^ Setting at: self ifAbsent: nil ! asSettingIfAbsent: aDefaultValue "Answer aSetting dedicated to locally store a value using this string as key. Make this setting to have aDefaultValue." ^ Setting at: self ifAbsent: aDefaultValue ! settingValue ^ self asSetting value ! settingValue: aValue "Sets the value of the setting that will be locally stored using this string as key. Note that aValue can be any object that can be stringifyed" ^ self asSetting value: aValue ! settingValueIfAbsent: aDefaultValue "Answer the value of the locally stored setting using this string as key. Use aDefaultValue in case no setting is found" ^ (self asSettingIfAbsent: aDefaultValue) value ! !