amber/st/Kernel-Objects.st

Smalltalk current createPackage: 'Kernel-Objects'!
nil subclass: #Object
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Object commentStamp!
**I am the root of the Smalltalk class system**. All classes in the system are subclasses of me.

I provide default behavior common to all normal objects, such as:

- accessing
- copying
- comparison
- error handling
- message sending
- reflection

Also utility messages that all objects should respond to are defined here.

I have no instance variable.

##Access

Instance variables can be accessed with `#instVarAt:` and `#instVarAt:put:`. `#instanceVariableNames` answers a collection of all instance variable names.
Accessing JavaScript properties of an object is done through `#basicAt:`, `#basicAt:put:` and `basicDelete:`.

##Copying

Copying an object is handled by `#copy` and `#deepCopy`. The first one performs a shallow copy of the receiver, while the second one performs a deep copy.
The hook method `#postCopy` can be overriden in subclasses to copy fields as necessary to complete the full copy. It will be sent by the copy of the receiver.

##Comparison

I understand equality `#=` and identity `#==` comparison.

##Error handling

- `#halt` is the typical message to use for inserting breakpoints during debugging.
- `#error:` throws a generic error exception
- `#doesNotUnderstand:` handles the fact that there was an attempt to send the given message to the receiver but the receiver does not understand this message.
	Overriding this message can be useful to implement proxies for example.!

!Object methodsFor: 'accessing'!

basicAt: aString
	<return self[aString]>
!

basicAt: aString put: anObject
	<return self[aString] = anObject>
!

basicDelete: aString
	<delete self[aString]; return aString>
!

class
	<return self.klass>
!

identityHash
	<
	var hash=self.identityHash;
	if (hash) return hash;
	hash=smalltalk.nextId();
	Object.defineProperty(self, 'identityHash', {value:hash});
	return hash;
	>
!

instVarAt: aString
	< return self['@'+aString] >
!

instVarAt: aString put: anObject
	< self['@' + aString] = anObject >
!

size
	self error: 'Object not indexable'
!

value
	<return self.valueOf()>
!

yourself
	^self
! !

!Object methodsFor: 'comparing'!

= anObject
	^self == anObject
!

== anObject
	^self identityHash = anObject identityHash
!

~= anObject
	^(self = anObject) = false
!

~~ anObject
	^(self == anObject) = false
! !

!Object methodsFor: 'converting'!

-> anObject
	^Association key: self value: anObject
!

asJSON
	| variables |
	variables := HashedCollection new.
	self class allInstanceVariableNames do: [:each |
		variables at: each put: (self instVarAt: each) asJSON].
	^variables
!

asJSONString
	^JSON stringify: self asJSON
!

asJavascript
	^self asString
!

asString
	^self printString
!

test
	| a |
	a := 1.
	self halt
! !

!Object methodsFor: 'copying'!

copy
	^self shallowCopy postCopy
!

deepCopy
	<
		var copy = self.klass._new();
		for(var i in self) {
		if(/^@.+/.test(i)) {
			copy[i] = self[i]._deepCopy();
		}
		}
		return copy;
	>
!

postCopy
!

shallowCopy
	<
		var copy = self.klass._new();
		for(var i in self) {
		if(/^@.+/.test(i)) {
			copy[i] = self[i];
		}
		}
		return copy;
	>
! !

!Object methodsFor: 'error handling'!

deprecatedAPI
	"Just a simple way to deprecate methods.
	#deprecatedAPI is in the 'error handling' protocol even if it doesn't throw an error,
	but it could in the future."
	console warn: thisContext home asString, ' is deprecated!! (in ', thisContext home home asString, ')'
!

doesNotUnderstand: aMessage
	MessageNotUnderstood new
		receiver: self;
		message: aMessage;
		signal
!

error: aString
	Error signal: aString
!

halt
	self error: 'Halt encountered'
!

shouldNotImplement
	self error: 'This method should not be implemented in ', self class name
!

subclassResponsibility
	self error: 'This method is a responsibility of a subclass'
!

throw: anObject
	< throw anObject >
!

try: aBlock catch: anotherBlock
	<try{return aBlock()} catch(e) {return anotherBlock(e)}>
! !

!Object methodsFor: 'initialization'!

initialize
! !

!Object methodsFor: 'inspecting'!

inspect
	InspectorHandler inspect: self
!

inspectOn: anInspector
	| variables |
	variables := Dictionary new.
	variables at: '#self' put: self.
	self class allInstanceVariableNames do: [:each |
		variables at: each put: (self instVarAt: each)].
	anInspector
		setLabel: self printString;
		setVariables: variables
! !

!Object methodsFor: 'message handling'!

basicPerform: aString
	^self basicPerform: aString withArguments: #()
!

basicPerform: aString withArguments: aCollection
	<return self[aString].apply(self, aCollection);>
!

perform: aString
	^self perform: aString withArguments: #()
!

perform: aString withArguments: aCollection
	<return smalltalk.send(self, aString._asSelector(), aCollection)>
! !

!Object methodsFor: 'printing'!

printOn: aStream
	"Append to the aStream, a string representing the receiver."
	
	aStream nextPutAll: (self class name first isVowel
		ifTrue: [ 'an ' ]
		ifFalse: [ 'a ' ]).
	aStream nextPutAll: self class name
!

printString
	"Answer a String representation of the receiver."

	^ String streamContents: [ :stream | self printOn: stream ]
! !

!Object methodsFor: 'streaming'!

putOn: aStream
	aStream nextPut: self
! !

!Object methodsFor: 'testing'!

ifNil: aBlock
	"inlined in the Compiler"
	^self
!

ifNil: aBlock ifNotNil: anotherBlock
	"inlined in the Compiler"
	^anotherBlock value: self
!

ifNotNil: aBlock
	"inlined in the Compiler"
	^aBlock value: self
!

ifNotNil: aBlock ifNil: anotherBlock
	"inlined in the Compiler"
	^aBlock value: self
!

isBehavior
	^ false
!

isBoolean
	^ false
!

isClass
	^false
!

isCompiledMethod
	^ false
!

isImmutable
	^ false
!

isKindOf: aClass
	^(self isMemberOf: aClass)
		ifTrue: [true]
		ifFalse: [self class inheritsFrom: aClass]
!

isMemberOf: aClass
	^self class = aClass
!

isMetaclass
	^false
!

isNil
	^false
!

isNumber
	^false
!

isPackage
	^ false
!

isParseFailure
	^false
!

isString
	^false
!

isSymbol
	^false
!

notNil
	^self isNil not
!

respondsTo: aSelector
	^self class canUnderstand: aSelector
! !

!Object class methodsFor: 'helios'!

heliosClass
	"Should be an Helios extension. Unfortunately, since helios can browse remote
	environments, we can't extend base classes"
	
	^ 'class'
! !

!Object class methodsFor: 'initialization'!

initialize
	"no op"
! !

Object subclass: #Boolean
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Boolean commentStamp!
I define the protocol for logic testing operations and conditional control structures for the logical values (see the `controlling` protocol).

I have two instances, `true` and `false`.

I am directly mapped to JavaScript Boolean. The `true` and `false` objects are the JavaScript boolean objects.

## Usage Example:

    aBoolean not ifTrue: [ ... ] ifFalse: [ ... ]!

!Boolean methodsFor: 'comparing'!

= aBoolean
	<
		if(!! aBoolean._isBoolean || !! aBoolean._isBoolean()) {
			return false;
		}
		return Boolean(self == true) == aBoolean
	>
!

== aBoolean
	^self = aBoolean
! !

!Boolean methodsFor: 'controlling'!

& aBoolean
	<
		if(self == true) {
		return aBoolean;
		} else {
		return false;
		}
	>
!

and: aBlock
	^self = true
		ifTrue: aBlock
		ifFalse: [false]
!

ifFalse: aBlock
	"inlined in the Compiler"
	^self ifTrue: [] ifFalse: aBlock
!

ifFalse: aBlock ifTrue: anotherBlock
	"inlined in the Compiler"
	^self ifTrue: anotherBlock ifFalse: aBlock
!

ifTrue: aBlock
	"inlined in the Compiler"
	^self ifTrue: aBlock ifFalse: []
!

ifTrue: aBlock ifFalse: anotherBlock
	"inlined in the Compiler"
	<
		if(self == true) {
		return aBlock();
		} else {
		return anotherBlock();
		}
	>
!

not
	^self = false
!

or: aBlock
	^self = true
		ifTrue: [true]
		ifFalse: aBlock
!

| aBoolean
	<
		if(self == true) {
		return true;
		} else {
		return aBoolean;
		}
	>
! !

!Boolean methodsFor: 'converting'!

asBit
	^ self ifTrue: [ 1 ] ifFalse: [ 0 ]
!

asJSON
	^self
!

asString
	< return self.toString() >
! !

!Boolean methodsFor: 'copying'!

deepCopy
	^self
!

shallowCopy
	^self
! !

!Boolean methodsFor: 'printing'!

printOn: aStream
	aStream nextPutAll: self asString
! !

!Boolean methodsFor: 'testing'!

isBoolean
	^ true
!

isImmutable
	^ true
! !

Object subclass: #Date
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Date commentStamp!
I am used to work with both dates and times. Therefore `Date today` and `Date now` are both valid in
Amber and answer the same date object.

Date directly maps to the `Date()` JavaScript constructor, and Amber date objects are JavaScript date objects.

## API

The class-side `instance creation` protocol contains some convenience methods for creating date/time objects such as `#fromSeconds:`.

Arithmetic and comparison is supported (see the `comparing` and `arithmetic` protocols).

The `converting` protocol provides convenience methods for various convertions (to numbers, strings, etc.).!

!Date methodsFor: 'accessing'!

day
	^self dayOfWeek
!

day: aNumber
	self dayOfWeek: aNumber
!

dayOfMonth
	<return self.getDate()>
!

dayOfMonth: aNumber
	<self.setDate(aNumber)>
!

dayOfWeek
	<return self.getDay() + 1>
!

dayOfWeek: aNumber
	<return self.setDay(aNumber - 1)>
!

hours
	<return self.getHours()>
!

hours: aNumber
	<self.setHours(aNumber)>
!

milliseconds
	<return self.getMilliseconds()>
!

milliseconds: aNumber
	<self.setMilliseconds(aNumber)>
!

minutes
	<return self.getMinutes()>
!

minutes: aNumber
	<self.setMinutes(aNumber)>
!

month
	<return self.getMonth() + 1>
!

month: aNumber
	<self.setMonth(aNumber - 1)>
!

seconds
	<return self.getSeconds()>
!

seconds: aNumber
	<self.setSeconds(aNumber)>
!

time
	<return self.getTime()>
!

time: aNumber
	<self.setTime(aNumber)>
!

year
	<return self.getFullYear()>
!

year: aNumber
	<self.setFullYear(aNumber)>
! !

!Date methodsFor: 'arithmetic'!

+ aDate
	<return self + aDate>
!

- aDate
	<return self - aDate>
! !

!Date methodsFor: 'comparing'!

< aDate
	<return self < aDate>
!

<= aDate
	<return self <= aDate>
!

> aDate
	<return self >> aDate>
!

>= aDate
	<return self >>= aDate>
! !

!Date methodsFor: 'converting'!

asDateString
	<return self.toDateString()>
!

asLocaleString
	<return self.toLocaleString()>
!

asMilliseconds
	^self time
!

asNumber
	^self asMilliseconds
!

asString
	<return self.toString()>
!

asTimeString
	<return self.toTimeString()>
! !

!Date methodsFor: 'printing'!

printOn: aStream
	aStream nextPutAll: self asString
! !

!Date class methodsFor: 'helios'!

heliosClass
	^ 'magnitude'
! !

!Date class methodsFor: 'instance creation'!

fromMilliseconds: aNumber
	^self new: aNumber
!

fromSeconds: aNumber
	^self fromMilliseconds: aNumber * 1000
!

fromString: aString
	"Example: Date fromString('2011/04/15 00:00:00')"
	^self new: aString
!

millisecondsToRun: aBlock
	| t |
	t := Date now.
	aBlock value.
	^Date now - t
!

new: anObject
	<return new Date(anObject)>
!

now
	^self today
!

today
	^self new
! !

Object subclass: #Environment
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Environment commentStamp!
I provide an unified entry point to manipulate Amber packages, classes and methods.

Typical use cases include IDEs, remote access and restricting browsing.!

!Environment methodsFor: 'accessing'!

allSelectors
	^ (Smalltalk current at: 'allSelectors') value
!

availableClassNames
	^ Smalltalk current classes 
		collect: [ :each | each name ]
!

availablePackageNames
	^ Smalltalk current packages 
		collect: [ :each | each name ]
!

availableProtocolsFor: aClass
	| protocols |
	
	protocols := aClass protocols.
	aClass superclass ifNotNil: [ protocols addAll: (self availableProtocolsFor: aClass superclass) ].
	^ protocols asSet asArray
!

classBuilder
	^ ClassBuilder new
!

classNamed: aString
	^ (Smalltalk current at: aString asSymbol)
		ifNil: [ self error: 'Invalid class name' ]
!

classes
	^ Smalltalk current classes
!

packages
	^ Smalltalk current packages
!

systemAnnouncer
	^ (Smalltalk current at: #SystemAnnouncer) current
! !

!Environment methodsFor: 'actions'!

commitPackage: aPackage
	aPackage commit
!

copyClass: aClass to: aClassName
	(Smalltalk current at: aClassName)
		ifNotNil: [ self error: 'A class named ', aClassName, ' already exists' ].
		
	ClassBuilder new copyClass: aClass named: aClassName
!

eval: aString on: aReceiver
	| compiler |
	compiler := Compiler new.
	[ compiler parseExpression: aString ] on: Error do: [ :ex |
		^ window alert: ex messageText ].
	^ compiler evaluateExpression: aString on: aReceiver
!

moveClass: aClass toPackage: aPackageName
	| package |
	
	package := Package named: aPackageName.
	package ifNil: [ self error: 'Invalid package name' ].
	package == aClass package ifTrue: [ ^ self ].
	
	aClass package: package
!

moveMethod: aMethod toClass: aClassName
	| destinationClass |
	
	destinationClass := Smalltalk current at: aClassName asSymbol.
	destinationClass ifNil: [ self error: 'Invalid class name' ].
	destinationClass == aMethod methodClass ifTrue: [ ^ self ].
	
	destinationClass 
		compile: aMethod source
		category: aMethod protocol.
	aMethod methodClass 
		removeCompiledMethod: aMethod
!

moveMethod: aMethod toProtocol: aProtocol
	aMethod category: aProtocol
!

registerErrorHandler: anErrorHandler
	ErrorHandler setCurrent: anErrorHandler
!

registerInspector: anInspector
	InspectorHandler register: anInspector
!

registerProgressHandler: aProgressHandler
	ProgressHandler setCurrent: aProgressHandler
!

removeClass: aClass
	Smalltalk current removeClass: aClass
!

removeMethod: aMethod
	aMethod methodClass removeCompiledMethod: aMethod
!

removeProtocol: aString from: aClass
	(aClass methods
		select: [ :each | each protocol = aString ])
		do: [ :each | aClass removeCompiledMethod: each ]
!

renameClass: aClass to: aClassName
	(Smalltalk current at: aClassName)
		ifNotNil: [ self error: 'A class named ', aClassName, ' already exists' ].
		
	ClassBuilder new renameClass: aClass to: aClassName
!

renameProtocol: aString to: anotherString in: aClass
	(aClass methods
		select: [ :each | each protocol = aString ])
		do: [ :each | each protocol: anotherString ]
!

setClassCommentOf: aClass to: aString
	aClass comment: aString
! !

!Environment methodsFor: 'compiling'!

addInstVarNamed: aString to: aClass
	self classBuilder
		addSubclassOf: aClass superclass 
		named: aClass name 
		instanceVariableNames: (aClass instanceVariableNames copy add: aString; yourself)
		package: aClass package name
!

compileClassComment: aString for: aClass
	aClass comment: aString
!

compileClassDefinition: aString
	self eval: aString on: DoIt new
!

compileMethod: sourceCode for: class protocol: protocol
	^ class
		compile: sourceCode
		category: protocol
! !

!Environment methodsFor: 'error handling'!

evaluate: aBlock on: anErrorClass do: exceptionBlock
	"Evaluate a block and catch exceptions happening on the environment stack"
	
	self try: aBlock catch: [ :exception | 
		(exception isKindOf: (self classNamed: anErrorClass name))
			ifTrue: [ exceptionBlock value: exception ]
 			ifFalse: [ exception signal ] ]
! !

Object subclass: #InspectorHandler
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!InspectorHandler commentStamp!
I am responsible for inspecting object.

My class-side `inspector` inst var holds the current inspector I'm delegating object inspection to.

The default inspector object is the transcript.!

InspectorHandler class instanceVariableNames: 'inspector'!

!InspectorHandler class methodsFor: 'accessing'!

inspector
	^ inspector ifNil: [ inspector := Transcript ]
! !

!InspectorHandler class methodsFor: 'registration'!

inspect: anObject
	^ self inspector inspect: anObject
!

register: anInspector
	^ inspector := anInspector
! !

Object subclass: #JSObjectProxy
	instanceVariableNames: 'jsObject'
	package: 'Kernel-Objects'!
!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
	<return self['@jsObject'][aString]>
!

at: aString ifAbsent: aBlock
	"return the aString property or evaluate aBlock if the property is not defined on the object"
	<
		var obj = self['@jsObject'];
		return aString in obj ? obj[aString] : aBlock();
	>
!

at: aString ifPresent: aBlock
	"return the evaluation of aBlock with the value if the property is defined or return nil"
	<
		var obj = self['@jsObject'];
		return aString in obj ? aBlock(obj[aString]) : 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"
	<
		var obj = self['@jsObject'];
		return aString in obj ? aBlock(obj[aString]) : anotherBlock();
	>
!

at: aString put: anObject
	<self['@jsObject'][aString] = anObject>
!

jsObject
	^jsObject
!

jsObject: aJSObject
	jsObject := aJSObject
!

lookupProperty: aString
	"Looks up a property in JS object.
	Answer the property if it is present, or nil if it is not present."
	
	<return aString in self._jsObject() ? aString : nil>
!

value
	"if attribute 'value' exists on the JS object return it,
	otherwise return the result of Object>>value."
	
	^ self 
		at: 'value' 
		ifAbsent: [ super value ]
! !

!JSObjectProxy methodsFor: 'enumerating'!

keysAndValuesDo: aBlock
	<
		var o = self['@jsObject'];
		for(var i in o) {
			aBlock(i, o[i]);
		}
	>
! !

!JSObjectProxy methodsFor: 'printing'!

printOn: aStream
	aStream nextPutAll: self jsObject toString
! !

!JSObjectProxy methodsFor: 'proxy'!

addObjectVariablesTo: aDictionary
	<
		for(var i in self['@jsObject']) {
			aDictionary._at_put_(i, self['@jsObject'][i]);
		}
	>
!

doesNotUnderstand: aMessage
	^ (self lookupProperty: aMessage selector asJavaScriptSelector)
		ifNil: [ super doesNotUnderstand: aMessage ]
		ifNotNil: [ :jsSelector | 
			self 
				forwardMessage: jsSelector 
				withArguments: aMessage arguments ]
!

forwardMessage: aString withArguments: anArray
	<
		return smalltalk.send(self._jsObject(), aString, anArray);
	>
!

inspectOn: anInspector
	| variables |
	variables := Dictionary new.
	variables at: '#self' put: self jsObject.
	anInspector setLabel: self printString.
	self addObjectVariablesTo: variables.
	anInspector setVariables: variables
! !

!JSObjectProxy class methodsFor: 'instance creation'!

on: aJSObject
	^self new
		jsObject: aJSObject;
		yourself
! !

Object subclass: #Number
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Number commentStamp!
I am the Amber representation for all numbers.
I am directly mapped to JavaScript Number.

## API

I provide all necessary methods for arithmetic operations, comparison, conversion and so on with numbers.

My instances can also be used to evaluate a block a fixed number of times:

	5 timesRepeat: [Transcript show: 'This will be printed 5 times'; cr].
	
	1 to: 5 do: [:aNumber| Transcript show: aNumber asString; cr].
	
	1 to: 10 by: 2 do: [:aNumber| Transcript show: aNumber asString; cr].!

!Number methodsFor: 'accessing'!

identityHash
	^self asString, 'n'
! !

!Number methodsFor: 'arithmetic'!

* aNumber
	"Inlined in the Compiler"
	<return self * aNumber>
!

+ aNumber
	"Inlined in the Compiler"
	<return self + aNumber>
!

- aNumber
	"Inlined in the Compiler"
	<return self - aNumber>
!

/ aNumber
	"Inlined in the Compiler"
	<return self / aNumber>
!

\\ aNumber
	<return self % aNumber>
!

abs
	<return Math.abs(self);>
!

max: aNumber
	<return Math.max(self, aNumber);>
!

min: aNumber
	<return Math.min(self, aNumber);>
!

negated
	^0 - self
!

sqrt
	<return Math.sqrt(self)>
!

squared
	^self * self
! !

!Number methodsFor: 'comparing'!

< aNumber
	"Inlined in the Compiler"
	<return self < aNumber>
!

<= aNumber
	"Inlined in the Compiler"
	<return self <= aNumber>
!

= aNumber
	<
		if(!! aNumber._isNumber || !! aNumber._isNumber()) {
			return false;
		}
		return Number(self) == aNumber
	>
!

> aNumber
	"Inlined in the Compiler"
	<return self >> aNumber>
!

>= aNumber
	"Inlined in the Compiler"
	<return self >>= aNumber>
! !

!Number methodsFor: 'converting'!

& aNumber
	<return self & aNumber>
!

@ aNumber
	^Point x: self y: aNumber
!

asJSON
	^self
!

asJavascript
	^'(', self printString, ')'
!

asPoint
	^Point x: self y: self
!

asString
	< return String(self) >
!

atRandom
	^(Random new next * self) truncated + 1
!

rounded
	<return Math.round(self);>
!

to: aNumber
	| array first last count |
	first := self truncated.
	last := aNumber truncated + 1.
	count := 1.
	array := Array new.
	(last - first) timesRepeat: [
		array at: count put: first.
		count := count + 1.
		first := first + 1].
	^array
!

to: stop by: step
	| array value pos |
	value := self.
	array := Array new.
	pos := 1.
	step = 0 ifTrue: [self error: 'step must be non-zero'].
	step < 0
		ifTrue: [[ value >= stop ] whileTrue: [
					array at: pos put: value.
					pos := pos + 1.
					value := value + step]]
		ifFalse: [[ value <= stop ] whileTrue: [
					array at: pos put: value.
				pos := pos + 1.
					value := value + step]].
	^array
!

truncated
	<
		if(self >>= 0) {
			return Math.floor(self);
		} else {
			return Math.floor(self * (-1)) * (-1);
		};
	>
!

| aNumber
	<return self | aNumber>
! !

!Number methodsFor: 'copying'!

copy
	^self
!

deepCopy
	^self copy
! !

!Number methodsFor: 'enumerating'!

timesRepeat: aBlock
	| count |
	count := 1.
	[count > self] whileFalse: [
		aBlock value.
		count := count + 1]
!

to: stop by: step do: aBlock
	| value |
	value := self.
	step = 0 ifTrue: [self error: 'step must be non-zero'].
	step < 0
		ifTrue: [[ value >= stop ] whileTrue: [
					aBlock value: value.
					value := value + step]]
		ifFalse: [[ value <= stop ] whileTrue: [
					aBlock value: value.
					value := value + step]]
!

to: stop do: aBlock
	"Evaluate aBlock for each number from self to aNumber."
	| nextValue |
	nextValue := self.
	[nextValue <= stop]
		whileTrue:
			[aBlock value: nextValue.
			nextValue := nextValue + 1]
! !

!Number methodsFor: 'printing'!

printOn: aStream
	aStream nextPutAll: self asString
!

printShowingDecimalPlaces: placesDesired
	<return self.toFixed(placesDesired)>
! !

!Number methodsFor: 'testing'!

even
	^ 0 = (self \\ 2)
!

isImmutable
	^ true
!

isNumber
	^true
!

isZero
	^self = 0
!

negative
	"Answer whether the receiver is mathematically negative."

	^ self < 0
!

odd
	^ self even not
!

positive
	"Answer whether the receiver is positive or equal to 0. (ST-80 protocol)."

	^ self >= 0
! !

!Number class methodsFor: 'helios'!

heliosClass
	^ 'magnitude'
! !

!Number class methodsFor: 'instance creation'!

pi
	<return Math.PI>
! !

Object subclass: #Organizer
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Organizer commentStamp!
I represent categorization information. 

## API

Use `#addElement:` and `#removeElement:` to manipulate instances.!

!Organizer methodsFor: 'accessing'!

addElement: anObject
	<self.elements.addElement(anObject)>
!

elements
	^ (self basicAt: 'elements') copy
!

removeElement: anObject
	<self.elements.removeElement(anObject)>
! !

Organizer subclass: #ClassOrganizer
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!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
	< return self.theClass >
! !

Organizer subclass: #PackageOrganizer
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!PackageOrganizer commentStamp!
I am an organizer specific to packages. I hold classes categorization information.!

Object subclass: #Package
	instanceVariableNames: 'commitPathJs commitPathSt'
	package: 'Kernel-Objects'!
!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'!

commitPathJs
	^ commitPathJs ifNil: [self class defaultCommitPathJs]
!

commitPathJs: aString
	commitPathJs := aString
!

commitPathSt
	^ commitPathSt ifNil: [self class defaultCommitPathSt]
!

commitPathSt: aString
	commitPathSt := aString
!

name
	<return self.pkgName>
!

name: aString
	<self.pkgName = aString>
!

organization
	^ self basicAt: 'organization'
! !

!Package methodsFor: 'classes'!

classes
	^ self organization elements
!

setupClasses
	self classes
		do: [ :each | ClassBuilder new setupClass: each ];
		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: 'printing'!

printOn: aStream
	super printOn: aStream.
	aStream 
		nextPutAll: ' (';
		nextPutAll: self name;
		nextPutAll: ')'
! !

!Package methodsFor: 'testing'!

isPackage
	^ true
! !

Package class instanceVariableNames: 'defaultCommitPathJs defaultCommitPathSt'!

!Package class methodsFor: 'accessing'!

named: aPackageName

	^Smalltalk current packageAt: aPackageName
!

named: aPackageName ifAbsent: aBlock

	^Smalltalk current packageAt: aPackageName ifAbsent: aBlock
! !

!Package class methodsFor: 'commit paths'!

commitPathsFromLoader
	<
		var commitPath = typeof amber !!== 'undefined' && amber.commitPath;
		if (!!commitPath) return;
		if (commitPath.js) self._defaultCommitPathJs_(commitPath.js);
		if (commitPath.st) self._defaultCommitPathSt_(commitPath.st);
	>
!

defaultCommitPathJs
	^ defaultCommitPathJs ifNil: [ defaultCommitPathJs := 'js']
!

defaultCommitPathJs: aString
	defaultCommitPathJs := aString
!

defaultCommitPathSt
	^ defaultCommitPathSt ifNil: [ defaultCommitPathSt := 'st']
!

defaultCommitPathSt: aString
	defaultCommitPathSt := aString
!

resetCommitPaths
		defaultCommitPathJs := nil.
		defaultCommitPathSt := nil.
! !

!Package class methodsFor: 'initialization'!

initialize
	super initialize.
	self commitPathsFromLoader
! !

!Package class methodsFor: 'loading-storing'!

load: aPackageName
	self load: aPackageName prefix: self defaultCommitPathJs, '/'
!

load: aPackageName prefix: aPrefix
	jQuery
		getScript: (aPrefix , aPackageName , '.js')
		onSuccess: [
			(Package named: aPackageName) setupClasses ]
! !

!Package class methodsFor: 'sorting'!

sortedClasses: classes
	"Answer classes, sorted by superclass/subclasses and by class name for common subclasses (Issue #143)"

	| children others nodes expandedClasses |
	children := #().
	others := #().
	classes do: [:each |
		(classes includes: each superclass)
			ifFalse: [children add: each]
			ifTrue: [others add: each]].
	nodes := children collect: [:each |
		ClassSorterNode on: each classes: others level: 0].
	nodes := nodes sorted: [:a :b | a theClass name <= b theClass name ].
	expandedClasses := Array new.
	nodes do: [:aNode |
		aNode traverseClassesWith: expandedClasses].
	^expandedClasses
! !

Object subclass: #Point
	instanceVariableNames: 'x y'
	package: 'Kernel-Objects'!
!Point commentStamp!
I represent an x-y pair of numbers usually designating a geometric coordinate.

## API

Instances are traditionally created using the binary `#@` message to a number:

	100@120

Points can then be arithmetically manipulated:

	100@100 + (10@10)

...or for example:

	(100@100) * 2

**NOTE:** Creating a point with a negative y-value will need a space after `@` in order to avoid a parsing error:

	100@ -100 "but 100@-100 would not parse"!

!Point methodsFor: 'accessing'!

x
	^x
!

x: aNumber
	x := aNumber
!

y
	^y
!

y: aNumber
	y := aNumber
! !

!Point methodsFor: 'arithmetic'!

* aPoint
	^Point x: self x * aPoint asPoint x y: self y * aPoint asPoint y
!

+ aPoint
	^Point x: self x + aPoint asPoint x y: self y + aPoint asPoint y
!

- aPoint
	^Point x: self x - aPoint asPoint x y: self y - aPoint asPoint y
!

/ aPoint
	^Point x: self x / aPoint asPoint x y: self y / aPoint asPoint y
!

= aPoint
	^aPoint class = self class and: [
		(aPoint x = self x) & (aPoint y = self y)]
! !

!Point methodsFor: 'converting'!

asPoint
	^self
! !

!Point methodsFor: 'printing'!

printOn: aStream
	"Print receiver in classic x@y notation."

	x printOn: aStream.
	
	aStream nextPutAll: '@'.
	(y notNil and: [y negative]) ifTrue: [
			"Avoid ambiguous @- construct"
			aStream space ].
	
	y printOn: aStream
! !

!Point methodsFor: 'transforming'!

translateBy: delta
	"Answer a Point translated by delta (an instance of Point)."
	^(delta x + x) @ (delta y + y)
! !

!Point class methodsFor: 'helios'!

heliosClass
	^ 'magnitude'
! !

!Point class methodsFor: 'instance creation'!

x: aNumber y: anotherNumber
	^self new
		x: aNumber;
		y: anotherNumber;
		yourself
! !

Object subclass: #ProgressHandler
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!ProgressHandler commentStamp!
I am used to manage progress in collection iterations, see `SequenceableCollection >> #do:displayingProgress:`.

Subclasses of can register themselves as the current handler with
`ProgressHandler class >> register`.

The default behavior is to simply iterate over the collection.!

!ProgressHandler methodsFor: 'progress handling'!

do: aBlock on: aCollection displaying: aString
	aCollection do: aBlock
! !

ProgressHandler class instanceVariableNames: 'current'!

!ProgressHandler class methodsFor: 'accessing'!

current
	^current ifNil: [ current := self new ]
!

setCurrent: anHandler
	current := anHandler
! !

!ProgressHandler class methodsFor: 'initialization'!

initialize
	self register
!

register
	ProgressHandler setCurrent: self new
! !

Object subclass: #Random
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Random commentStamp!
I an used to generate a random number and I am implemented as a trivial wrapper around javascript `Math.random()`.

## API

The typical use case it to use the `#next` method like the following:

	Random new next

This will return a float x where x < 1 and x > 0. If you want a random integer from 1 to 10 you can use `#atRandom`

	10 atRandom

A random number in a specific interval can be obtained with the following:

	(3 to: 7) atRandom

Be aware that `#to:` does not create an Interval as in other Smalltalk implementations but in fact an `Array` of numbers, so it's better to use:

	5 atRandom + 2

Since `#atRandom` is implemented in `SequencableCollection` you can easy pick an element at random:

	#('a' 'b' 'c') atRandom

As well as letter from a `String`:

	'abc' atRandom

Since Amber does not have Characters this will return a `String` of length 1 like for example `'b'`.!

!Random methodsFor: 'accessing'!

next
	<return Math.random()>
!

next: anInteger
	^(1 to: anInteger) collect: [:each | self next]
! !

Object subclass: #Smalltalk
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!Smalltalk commentStamp!
I represent the global JavaScript variable `smalltalk` declared in `js/boot.js`.

## API

I have only one instance, accessed with class-side method `#current`.

The `smalltalk` object holds all class and packages defined in the system.

## Classes

Classes can be accessed using the following methods:

- `#classes` answers the full list of Smalltalk classes in the system
- `#at:` answers a specific 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 `js/parser.js` parser file in order to work.!

!Smalltalk methodsFor: 'accessing'!

at: aString
	<return self[aString]>
!

parse: aString
	| result |
	
	self 
		try: [result := self basicParse: aString] 
		catch: [:ex | (self parseError: ex parsing: aString) signal].
		
	^ result
		source: aString;
		yourself
!

readJSObject: anObject
	<return self.readJSObject(anObject)>
!

reservedWords
	"JavaScript reserved words"
	<return self.reservedWords>
!

version
	"Answer the version string of Amber"
	
	^ '0.10'
! !

!Smalltalk methodsFor: 'classes'!

classes
	<return self.classes()>
!

deleteClass: aClass
	"Deletes a class by deleting its binding only. Use #removeClass instead"
	
	<self.removeClass(aClass)>
!

removeClass: aClass
	aClass isMetaclass ifTrue: [self error: aClass asString, ' is a Metaclass and cannot be removed!!'].
	
	self deleteClass: aClass.
	
	SystemAnnouncer current
		announce: (ClassRemoved new
			theClass: aClass;
			yourself)
! !

!Smalltalk methodsFor: 'error handling'!

asSmalltalkException: anObject
	"A JavaScript exception may be thrown.
	We then need to convert it back to a Smalltalk object"
	
	^ ((self isSmalltalkObject: anObject) and: [ anObject isKindOf: Error ])
		ifTrue: [ anObject ]
		ifFalse: [ JavaScriptException on: anObject ]
!

parseError: anException parsing: aString
	^ ParseError new messageText: 'Parse error on line ', (anException basicAt: 'line') ,' column ' , (anException basicAt: 'column') ,' : Unexpected character ', (anException basicAt: 'found')
! !

!Smalltalk methodsFor: 'packages'!

createPackage: packageName
	"Create and bind a new package with given name and return it."
	<return smalltalk.addPackage(packageName)>
!

deletePackage: packageName
	"Deletes a package by deleting its binding, but does not check if it contains classes etc.
	To remove a package, use #removePackage instead."

	<delete smalltalk.packages[packageName]>
!

packageAt: packageName
	<return self.packages[packageName]>
!

packageAt: packageName ifAbsent: aBlock
	^(self packageAt: packageName) ifNil: aBlock
!

packages
	"Return all Package instances in the system."

	<return self.packages.all()>
!

pseudoVariableNames
	^ #('self' 'super' 'nil' 'true' 'false' 'thisContext')
!

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 deletePackage: packageName
!

renamePackage: packageName to: newName
	"Rename a package."

	| pkg |
	pkg := self packageAt: packageName ifAbsent: [self error: 'Missing package: ', packageName].
	(self packageAt: newName) ifNotNil: [self error: 'Already exists a package called: ', newName].
	(self basicAt: 'packages') at: newName put: pkg.
	pkg name: newName.
	self deletePackage: packageName.
! !

!Smalltalk methodsFor: 'private'!

basicParse: aString
	<return smalltalk.parser.parse(aString)>
!

createPackage: packageName properties: aDict
	"Needed to import .st files: they begin with this call."
	self deprecatedAPI.
	
	aDict isEmpty ifFalse: [ self error: 'createPackage:properties: called with nonempty properties' ].
	^ self createPackage: packageName
! !

!Smalltalk methodsFor: 'testing'!

isSmalltalkObject: anObject
	"Consider anObject a Smalltalk object if it has a 'klass' property.
	Note that this may be unaccurate"
	
	<return typeof anObject.klass !!== 'undefined'>
! !

Smalltalk class instanceVariableNames: 'current'!

!Smalltalk class methodsFor: 'accessing'!

current
	<return smalltalk>
! !

Object subclass: #Timeout
	instanceVariableNames: 'rawTimeout'
	package: 'Kernel-Objects'!
!Timeout commentStamp!
I am wrapping the returns from `set{Timeout,Interval}`.

## Motivation

Number suffices in browsers, but node.js returns an object.!

!Timeout methodsFor: 'accessing'!

rawTimeout: anObject
	rawTimeout := anObject
! !

!Timeout methodsFor: 'timeout/interval'!

clearInterval
	<
		var interval = self["@rawTimeout"];
		clearInterval(interval);
	>
!

clearTimeout
	<
		var timeout = self["@rawTimeout"];
		clearTimeout(timeout);
	>
! !

!Timeout class methodsFor: 'instance creation'!

on: anObject
	^self new rawTimeout: anObject; yourself
! !

Object subclass: #UndefinedObject
	instanceVariableNames: ''
	package: 'Kernel-Objects'!
!UndefinedObject commentStamp!
I describe the behavior of my sole instance, `nil`. `nil` represents a prior value for variables that have not been initialized, or for results which are meaningless.

`nil` is the Smalltalk equivalent of the `undefined` JavaScript object.

__note:__ When sending messages to the `undefined` JavaScript object, it will be replaced by `nil`.!

!UndefinedObject methodsFor: 'class creation'!

subclass: aString instanceVariableNames: anotherString
	^self subclass: aString instanceVariableNames: anotherString package: nil
!

subclass: aString instanceVariableNames: aString2 category: aString3
	"Kept for compatibility."
	self deprecatedAPI.
	^self subclass: aString instanceVariableNames: aString2 package: aString3
!

subclass: aString instanceVariableNames: aString2 package: aString3
	^ClassBuilder new
		superclass: self subclass: aString asString instanceVariableNames: aString2 package: aString3
! !

!UndefinedObject methodsFor: 'converting'!

asJSON
	^null
! !

!UndefinedObject methodsFor: 'copying'!

deepCopy
	^self
!

shallowCopy
	^self
! !

!UndefinedObject methodsFor: 'printing'!

printOn: aStream
	aStream nextPutAll: 'nil'
! !

!UndefinedObject methodsFor: 'testing'!

ifNil: aBlock
	"inlined in the Compiler"
	^self ifNil: aBlock ifNotNil: []
!

ifNil: aBlock ifNotNil: anotherBlock
	"inlined in the Compiler"
	^aBlock value
!

ifNotNil: aBlock
	"inlined in the Compiler"
	^self
!

ifNotNil: aBlock ifNil: anotherBlock
	"inlined in the Compiler"
	^anotherBlock value
!

isImmutable
	^ true
!

isNil
	^true
!

notNil
	^false
! !

!UndefinedObject class methodsFor: 'instance creation'!

new
		self error: 'You cannot create new instances of UndefinedObject. Use nil'
! !

!String methodsFor: '*Kernel-Objects'!

asJavaScriptSelector
	"Return first keyword of the selector, without trailing colon."
	^self replace: '^([a-zA-Z0-9]*).*$' with: '$1'
! !