amber/st/Importer-Exporter.st

Smalltalk current createPackage: 'Importer-Exporter'!
Object subclass: #AmdExporter
	instanceVariableNames: ''
	package: 'Importer-Exporter'!

!AmdExporter class methodsFor: 'exporting-output'!

exportPackageEpilogueOf: aPackage on: aStream
	aStream
		nextPutAll: '});';
		lf
!

exportPackagePrologueOf: aPackage on: aStream
	aStream
		nextPutAll: 'define("';
		nextPutAll: (aPackage amdNamespace ifNil: [ 'amber' ]); "ifNil: only for LegacyPH, it should not happen with AmdPH"
		nextPutAll: '/';
		nextPutAll: aPackage name;
		nextPutAll: '", ["';
		nextPutAll: ((#('amber_vm/smalltalk' 'amber_vm/nil' 'amber_vm/_st'), (self amdNamesOfPackages: aPackage loadDependencies)) join: '","');
		nextPutAll: '"], function(smalltalk,nil,_st){';
		lf
!

exportPackageTransportOf: aPackage on: aStream
	aStream
		nextPutAll: 'smalltalk.packages[';
		nextPutAll: aPackage name asJavascript;
		nextPutAll: '].transport = ';
		nextPutAll: aPackage transportJson;
		nextPutAll: ';';
		lf
! !

!AmdExporter class methodsFor: 'private'!

amdNamesOfPackages: anArray
	| deps depNames |
	^(anArray
		select: [ :each | each amdNamespace notNil ])
		collect: [ :each | each amdNamespace, '/', each name ]
! !

Object subclass: #ChunkExporter
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!ChunkExporter commentStamp!
I am an exporter dedicated to outputting Amber source code in the classic Smalltalk chunk format.

I do not output any compiled code.!

!ChunkExporter class methodsFor: 'exporting-accessing'!

extensionCategoriesOfPackage: package
	"Issue #143: sort protocol alphabetically"

	| name map result |
	name := package name.
	result := OrderedCollection new.
	(Package sortedClasses: Smalltalk current classes) do: [:each |
		{each. each class} do: [:aClass |
			map := Dictionary new.
			aClass protocolsDo: [:category :methods |
				(category match: '^\*', name) ifTrue: [ map at: category put: methods ]].
			result addAll: ((map keys sorted: [:a :b | a <= b ]) collect: [:category |
				#{ 'methods'->(map at: category). 'name'->category. 'class'->aClass}]) ]].
	^result
!

methodsOfCategory: category
	"Issue #143: sort methods alphabetically"

	^(category at: #methods) sorted: [:a :b | a selector <= b selector]
!

ownCategoriesOfClass: aClass
	"Issue #143: sort protocol alphabetically"

	| map |
	map := Dictionary new.
	aClass protocolsDo: [:category :methods |
		(category match: '^\*') ifFalse: [ map at: category put: methods ]].
	^(map keys sorted: [:a :b | a <= b ]) collect: [:category |
		#{
			'methods'->(map at: category).
			'name'->category.
			'class'->aClass }]
!

ownCategoriesOfMetaClass: aClass
	"Issue #143: sort protocol alphabetically"

	^self ownCategoriesOfClass: aClass class
! !

!ChunkExporter class methodsFor: 'exporting-output'!

exportCategoryEpilogueOf: category on: aStream
	aStream nextPutAll: ' !!'; lf; lf
!

exportCategoryPrologueOf: category on: aStream
	aStream
		nextPutAll: '!!', (self classNameFor: (category at: #class));
		nextPutAll: ' methodsFor: ''', (category at: #name), '''!!'
!

exportDefinitionOf: aClass on: aStream
	"Chunk format."

	aStream
		nextPutAll: (self classNameFor: aClass superclass);
		nextPutAll: ' subclass: #', (self classNameFor: aClass); lf;
		tab; nextPutAll: 'instanceVariableNames: '''.
	aClass instanceVariableNames
		do: [:each | aStream nextPutAll: each]
		separatedBy: [aStream nextPutAll: ' '].
	aStream
		nextPutAll: ''''; lf;
		tab; nextPutAll: 'package: ''', aClass category, '''!!'; lf.
	aClass comment notEmpty ifTrue: [
		aStream
		nextPutAll: '!!', (self classNameFor: aClass), ' commentStamp!!';lf;
		nextPutAll: (self chunkEscape: aClass comment), '!!';lf].
	aStream lf
!

exportMetaDefinitionOf: aClass on: aStream

	aClass class instanceVariableNames isEmpty ifFalse: [
		aStream
			nextPutAll: (self classNameFor: aClass class);
			nextPutAll: ' instanceVariableNames: '''.
		aClass class instanceVariableNames
			do: [:each | aStream nextPutAll: each]
			separatedBy: [aStream nextPutAll: ' '].
		aStream
			nextPutAll: '''!!'; lf; lf]
!

exportMethod: aMethod on: aStream
	aStream
		lf; lf; nextPutAll: (self chunkEscape: aMethod source); lf;
		nextPutAll: '!!'
!

exportPackageDefinitionOf: package on: aStream
	"Chunk format."

	aStream
		nextPutAll: 'Smalltalk current createPackage: ''', package name, '''!!';
		lf
! !

!ChunkExporter class methodsFor: 'fileOut'!

recipe
	"Export a given package."

	| exportCategoryRecipe |
	exportCategoryRecipe := {
		self -> #exportCategoryPrologueOf:on:.
		{
			self -> #methodsOfCategory:.
			self -> #exportMethod:on: }.
		self -> #exportCategoryEpilogueOf:on: }.

	^{
		self -> #exportPackageDefinitionOf:on:.
		{
			PluggableExporter -> #ownClassesOfPackage:.
			self -> #exportDefinitionOf:on:.
			{ self -> #ownCategoriesOfClass: }, exportCategoryRecipe.
			self -> #exportMetaDefinitionOf:on:.
			{ self -> #ownCategoriesOfMetaClass: }, exportCategoryRecipe }.
		{ self -> #extensionCategoriesOfPackage: }, exportCategoryRecipe
	}
! !

!ChunkExporter class methodsFor: 'private'!

chunkEscape: aString
	"Replace all occurrences of !! with !!!! and trim at both ends."

	^(aString replace: '!!' with: '!!!!') trimBoth
!

classNameFor: aClass
	^aClass isMetaclass
		ifTrue: [aClass instanceClass name, ' class']
		ifFalse: [
		aClass isNil
			ifTrue: ['nil']
			ifFalse: [aClass name]]
! !

Object subclass: #ChunkParser
	instanceVariableNames: 'stream'
	package: 'Importer-Exporter'!
!ChunkParser commentStamp!
I am responsible for parsing aStream contents in the chunk format.

## API

    ChunkParser new
        stream: aStream;
        nextChunk!

!ChunkParser methodsFor: 'accessing'!

stream: aStream
	stream := aStream
! !

!ChunkParser methodsFor: 'reading'!

nextChunk
	"The chunk format (Smalltalk Interchange Format or Fileout format)
	is a trivial format but can be a bit tricky to understand:
		- Uses the exclamation mark as delimiter of chunks.
		- Inside a chunk a normal exclamation mark must be doubled.
		- A non empty chunk must be a valid Smalltalk expression.
		- A chunk on top level with a preceding empty chunk is an instruction chunk:
			- The object created by the expression then takes over reading chunks.

	This metod returns next chunk as a String (trimmed), empty String (all whitespace) or nil."

	| char result chunk |
	result := '' writeStream.
		[char := stream next.
		char notNil] whileTrue: [
				char = '!!' ifTrue: [
						stream peek = '!!'
								ifTrue: [stream next "skipping the escape double"]
								ifFalse: [^result contents trimBoth "chunk end marker found"]].
				result nextPut: char].
	^nil "a chunk needs to end with !!"
! !

!ChunkParser class methodsFor: 'not yet classified'!

on: aStream
	^self new stream: aStream
! !

Object subclass: #Exporter
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!Exporter commentStamp!
I am responsible for outputting Amber code into a JavaScript string.

The generated output is enough to reconstruct the exported data, including Smalltalk source code and other metadata.

## Use case

I am typically used to save code outside of the Amber runtime (committing to disk, etc.).

## API

Use `#exportAll`, `#exportClass:` or `#exportPackage:` methods.!

!Exporter class methodsFor: 'exporting-accessing'!

extensionMethodsOfPackage: package
	"Issue #143: sort classes and methods alphabetically"

	| name result |
	name := package name.
	result := OrderedCollection new.
	(Package sortedClasses: Smalltalk current classes) do: [:each |
		{each. each class} do: [:aClass |
			result addAll: (((aClass methodDictionary values)
				sorted: [:a :b | a selector <= b selector])
				select: [:method | method category match: '^\*', name]) ]].
	^result
!

ownMethodsOfClass: aClass
	"Issue #143: sort methods alphabetically"

	^((aClass methodDictionary values) sorted: [:a :b | a selector <= b selector])
		reject: [:each | (each category match: '^\*')]
!

ownMethodsOfMetaClass: aClass
	"Issue #143: sort methods alphabetically"

	^self ownMethodsOfClass: aClass class
! !

!Exporter class methodsFor: 'exporting-output'!

exportDefinitionOf: aClass on: aStream
	aStream
		lf;
		nextPutAll: 'smalltalk.addClass(';
		nextPutAll: '''', (self classNameFor: aClass), ''', ';
		nextPutAll: 'smalltalk.', (self classNameFor: aClass superclass);
		nextPutAll: ', ['.
	aClass instanceVariableNames
		do: [:each | aStream nextPutAll: '''', each, '''']
		separatedBy: [aStream nextPutAll: ', '].
	aStream
		nextPutAll: '], ''';
		nextPutAll: aClass category, '''';
		nextPutAll: ');'.
	aClass comment notEmpty ifTrue: [
		aStream
			lf;
		nextPutAll: 'smalltalk.';
		nextPutAll: (self classNameFor: aClass);
		nextPutAll: '.comment=';
		nextPutAll: aClass comment asJavascript;
		nextPutAll: ';'].
	aStream lf
!

exportMetaDefinitionOf: aClass on: aStream
	aStream lf.
	aClass class instanceVariableNames isEmpty ifFalse: [
		aStream
		nextPutAll: 'smalltalk.', (self classNameFor: aClass class);
		nextPutAll: '.iVarNames = ['.
		aClass class instanceVariableNames
		do: [:each | aStream nextPutAll: '''', each, '''']
		separatedBy: [aStream nextPutAll: ','].
		aStream nextPutAll: '];', String lf]
!

exportMethod: aMethod on: aStream
	aStream
		nextPutAll: 'smalltalk.addMethod(';lf;
		"nextPutAll: aMethod selector asSelector asJavascript, ',';lf;"
		nextPutAll: 'smalltalk.method({';lf;
		nextPutAll: 'selector: ', aMethod selector asJavascript, ',';lf;
		nextPutAll: 'category: ''', aMethod category, ''',';lf;
		nextPutAll: 'fn: ', aMethod fn compiledSource, ',';lf;
		nextPutAll: 'args: ', aMethod arguments asJavascript, ','; lf;
		nextPutAll: 'source: ', aMethod source asJavascript, ',';lf;
		nextPutAll: 'messageSends: ', aMethod messageSends asJavascript, ',';lf;
		nextPutAll: 'referencedClasses: ', aMethod referencedClasses asJavascript.
	aStream
		lf;
		nextPutAll: '}),';lf;
		nextPutAll: 'smalltalk.', (self classNameFor: aMethod methodClass);
		nextPutAll: ');';lf;lf
!

exportPackageDefinitionOf: package on: aStream
	aStream
		nextPutAll: 'smalltalk.addPackage(';
		nextPutAll: '''', package name, ''');';
		lf
!

exportPackageEpilogueOf: aPackage on: aStream
	aStream
		nextPutAll: '})(global_smalltalk,global_nil,global__st);';
		lf
!

exportPackagePrologueOf: aPackage on: aStream
	aStream
		nextPutAll: '(function(smalltalk,nil,_st){';
		lf
! !

!Exporter class methodsFor: 'fileOut'!

amdRecipe
	"Export a given package with amd transport type."

	| legacy |
	legacy := self recipe.
	^(legacy copyFrom: 1 to: 2),
	{ AmdExporter -> #exportPackageTransportOf:on: },
	(legacy copyFrom: 3 to: legacy size)
!

recipe
	"Export a given package."

	^{
		AmdExporter -> #exportPackagePrologueOf:on:.
		self -> #exportPackageDefinitionOf:on:.
		{
			PluggableExporter -> #ownClassesOfPackage:.
			self -> #exportDefinitionOf:on:.
			{
				self -> #ownMethodsOfClass:.
				self -> #exportMethod:on: }.
			self -> #exportMetaDefinitionOf:on:.
			{
				self -> #ownMethodsOfMetaClass:.
				self -> #exportMethod:on: } }.
		{
			self -> #extensionMethodsOfPackage:.
			self -> #exportMethod:on: }.
		AmdExporter -> #exportPackageEpilogueOf:on:
	}
! !

!Exporter class methodsFor: 'private'!

classNameFor: aClass
	^aClass isMetaclass
		ifTrue: [aClass instanceClass name, '.klass']
		ifFalse: [
		aClass isNil
			ifTrue: ['nil']
			ifFalse: [aClass name]]
! !

Exporter subclass: #StrippedExporter
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!StrippedExporter commentStamp!
I export Amber code into a JavaScript string, but without any optional associated data like the Amber source code.!

!StrippedExporter class methodsFor: 'exporting-output'!

exportDefinitionOf: aClass on: aStream
	aStream
		lf;
		nextPutAll: 'smalltalk.addClass(';
		nextPutAll: '''', (self classNameFor: aClass), ''', ';
		nextPutAll: 'smalltalk.', (self classNameFor: aClass superclass);
		nextPutAll: ', ['.
	aClass instanceVariableNames
		do: [:each | aStream nextPutAll: '''', each, '''']
		separatedBy: [aStream nextPutAll: ', '].
	aStream
		nextPutAll: '], ''';
		nextPutAll: aClass category, '''';
		nextPutAll: ');'.
	aStream lf
!

exportMethod: aMethod on: aStream
	aStream
		nextPutAll: 'smalltalk.addMethod(';lf;
		"nextPutAll: aMethod selector asSelector asJavascript, ',';lf;"
		nextPutAll: 'smalltalk.method({';lf;
		nextPutAll: 'selector: ', aMethod selector asJavascript, ',';lf;
		nextPutAll: 'fn: ', aMethod fn compiledSource, ',';lf;
		nextPutAll: 'messageSends: ', aMethod messageSends asJavascript;
		nextPutAll: '}),';lf;
		nextPutAll: 'smalltalk.', (self classNameFor: aMethod methodClass);
		nextPutAll: ');';lf;lf
! !

Object subclass: #Importer
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!Importer commentStamp!
I can import Amber code from a string in the chunk format.

## API

    Importer new import: aString!

!Importer methodsFor: 'fileIn'!

import: aStream
	| chunk result parser lastEmpty |
	parser := ChunkParser on: aStream.
	lastEmpty := false.
	[chunk := parser nextChunk.
	chunk isNil] whileFalse: [
		chunk isEmpty
			ifTrue: [lastEmpty := true]
			ifFalse: [
				result := Compiler new evaluateExpression: chunk.
				lastEmpty
						ifTrue: [
									lastEmpty := false.
									result scanFrom: parser]]]
! !

InterfacingObject subclass: #PackageHandler
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!PackageHandler commentStamp!
I am responsible for handling package loading and committing.

I should not be used directly. Instead, use the corresponding `Package` methods.!

!PackageHandler methodsFor: 'committing'!

commit: aPackage
	self commitChannels
		do: [ :commitStrategyFactory || fileContents commitStrategy |
			commitStrategy := commitStrategyFactory value: aPackage.
			fileContents := String streamContents: [ :stream |
				(PluggableExporter newUsing: commitStrategy key) exportPackage: aPackage on: stream ].
			self ajaxPutAt: commitStrategy value data: fileContents ]
		displayingProgress: 'Committing package ', aPackage name
! !

!PackageHandler methodsFor: 'private'!

ajaxPutAt: aURL data: aString
	self
		ajax: #{
			'url' -> aURL.
			'type' -> 'PUT'.
			'data' -> aString.
			'contentType' -> 'text/plain;charset=UTF-8'.
			'error' -> [ :xhr | self error: 'Commiting ' , aURL , ' failed with reason: "' , (xhr responseText) , '"'] }
! !

PackageHandler class instanceVariableNames: 'registry'!

!PackageHandler class methodsFor: 'accessing'!

classRegisteredFor: aString
	^registry at: aString
!

for: aString
	^(self classRegisteredFor: aString) new
! !

!PackageHandler class methodsFor: 'initialization'!

initialize
	super initialize.
	registry := #{}
! !

!PackageHandler class methodsFor: 'registry'!

register: aClass for: aString
	registry at: aString put: aClass
!

registerFor: aString
	PackageHandler register: self for: aString
! !

PackageHandler subclass: #AmdPackageHandler
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!AmdPackageHandler commentStamp!
I am responsible for handling package loading and committing.

I should not be used directly. Instead, use the corresponding `Package` methods.!

!AmdPackageHandler methodsFor: 'committing'!

commitChannels
	^{ 
		[ :pkg | Exporter amdRecipe -> (pkg commitPathJs, '/', pkg name, '.js') ].
		[ :pkg | StrippedExporter amdRecipe -> (pkg commitPathJs, '/', pkg name, '.deploy.js') ].
		[ :pkg | ChunkExporter recipe -> (pkg commitPathSt, '/', pkg name, '.st') ]
	}
!

commitPathJsFor: aPackage
	^self toUrl: (self namespaceFor: aPackage)
!

commitPathStFor: aPackage
	"if _source is not mapped, .st commit will likely fail"
	^self toUrl: (self namespaceFor: aPackage), '/_source'.
!

namespaceFor: aPackage
	^aPackage amdNamespace
		ifNil: [ aPackage amdNamespace: self class defaultNamespace; amdNamespace ]
! !

!AmdPackageHandler methodsFor: 'private'!

toUrl: aString
	(Smalltalk current at: '_amd_require')
		ifNil: [ self error: 'AMD loader not present' ]
		ifNotNil: [ :require | ^(require basicAt: 'toUrl') value: aString ]
! !

AmdPackageHandler class instanceVariableNames: 'defaultNamespace'!

!AmdPackageHandler class methodsFor: 'commit paths'!

commitPathsFromLoader
	"TODO"
!

defaultNamespace
	^ defaultNamespace ifNil: [ self error: 'AMD default namespace not set.' ]
!

defaultNamespace: aString
	defaultNamespace := aString
!

resetCommitPaths
	defaultNamespace := nil
! !

!AmdPackageHandler class methodsFor: 'initialization'!

initialize
	super initialize.
	self registerFor: 'amd'.
	self commitPathsFromLoader
! !

PackageHandler subclass: #LegacyPackageHandler
	instanceVariableNames: ''
	package: 'Importer-Exporter'!
!LegacyPackageHandler commentStamp!
I am responsible for handling package loading and committing.

I should not be used directly. Instead, use the corresponding `Package` methods.!

!LegacyPackageHandler methodsFor: 'committing'!

commitChannels
	^{ 
		[ :pkg | Exporter recipe -> (pkg commitPathJs, '/', pkg name, '.js') ].
		[ :pkg | StrippedExporter recipe -> (pkg commitPathJs, '/', pkg name, '.deploy.js') ].
		[ :pkg | ChunkExporter recipe -> (pkg commitPathSt, '/', pkg name, '.st') ]
	}
!

commitPathJsFor: aPackage
	^self class defaultCommitPathJs
!

commitPathStFor: aPackage
	^self class defaultCommitPathSt
! !

!LegacyPackageHandler methodsFor: 'loading'!

loadPackage: packageName prefix: aString
	| url |
	url := '/', aString, '/js/', packageName, '.js'.
	self
		ajax: #{
			'url' -> url.
			'type' -> 'GET'.
			'dataType' -> 'script'.
			'complete' -> [ :jqXHR :textStatus |
				jqXHR readyState = 4
					ifTrue: [ self setupPackageNamed: packageName prefix: aString ] ].
			'error' -> [ self alert: 'Could not load package at: ', url ]
		}
!

loadPackages: aCollection prefix: aString
	aCollection do: [ :each |
		self loadPackage: each prefix: aString ]
! !

!LegacyPackageHandler methodsFor: 'private'!

setupPackageNamed: packageName prefix: aString

	(Package named: packageName)
		setupClasses;
		commitPathJs: '/', aString, '/js';
		commitPathSt: '/', aString, '/st'
! !

LegacyPackageHandler class instanceVariableNames: 'defaultCommitPathJs defaultCommitPathSt'!

!LegacyPackageHandler 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
! !

!LegacyPackageHandler class methodsFor: 'initialization'!

initialize
	super initialize.
	self registerFor: 'unknown'.
	self commitPathsFromLoader
! !

!LegacyPackageHandler class methodsFor: 'loading'!

loadPackages: aCollection prefix: aString
	^ self new loadPackages: aCollection prefix: aString
! !

Object subclass: #PluggableExporter
	instanceVariableNames: 'recipe'
	package: 'Importer-Exporter'!

!PluggableExporter methodsFor: 'accessing'!

recipe
	^recipe
!

recipe: anArray
	recipe := anArray
! !

!PluggableExporter methodsFor: 'fileOut'!

export: anObject usingRecipe: anArray on: aStream
	| args |
	args := { anObject. aStream }.
	anArray do: [ :each | | val |
		val := each value.
		val == each
			ifFalse: [ "association"
				each key perform: val withArguments: args ]
			ifTrue: [ "sub-array"
				| selection |
				selection := each first key perform: each first value withArguments: { anObject }.
				selection do: [ :eachPart |	self export: eachPart usingRecipe: each allButFirst on: aStream ]]]
!

exportAll
	"Export all packages in the system."

	^String streamContents: [:stream |
		Smalltalk current packages do: [:pkg |
		self exportPackage: pkg on: stream]]
!

exportPackage: aPackage on: aStream
	self export: aPackage usingRecipe: self recipe on: aStream
! !

!PluggableExporter class methodsFor: 'exporting-accessing'!

newUsing: recipe
	^self new recipe: recipe; yourself
!

ownClassesOfPackage: package
	"Export classes in dependency order.
	Update (issue #171): Remove duplicates for export"
	^package sortedClasses asSet
! !

!Package methodsFor: '*Importer-Exporter'!

amdNamespace
<return (self.transport && self.transport.amdNamespace) || nil>
!

amdNamespace: aString
<
	if (!!self.transport) { self.transport = { type: 'amd' }; }
	if (self.transport.type !!== 'amd') { throw new Error('Package '+self._name()+' has transport type '+self.transport.type+', not "amd".'); }
	self.transport.amdNamespace = aString;
>
!

commit
	^ self transport commit: self
!

commitPathJs
	^ (extension ifNil: [ extension := #{} ]) at: #commitPathJs ifAbsent: [self transport commitPathJsFor: self]
!

commitPathJs: aString
	^ (extension ifNil: [ extension := #{} ]) at: #commitPathJs put: aString
!

commitPathSt
	^ (extension ifNil: [ extension := #{} ]) at: #commitPathSt ifAbsent: [self transport commitPathStFor: self]
!

commitPathSt: aString
	^ (extension ifNil: [ extension := #{} ]) at: #commitPathSt put: aString
!

loadDependencies
	"Returns list of packages that need to be present
	before loading this package.
	These are determined as set of packages covering
	all classes used either for subclassing or for defining
	extension methods on."
	
	"Fake one for now. TODO"
	| root |
	root := Object package.
	self == root ifTrue: [ ^#() ] ifFalse: [ ^{root} ]
!

transport
	^ PackageHandler for: self transportType
!

transportJson
	<return JSON.stringify(self.transport || null);>
!

transportType
	<return (self.transport && self.transport.type) || 'unknown';>
! !