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[xtend2] Creating a generator [message #754890]

Fri, 04 November 2011 19:39

Peter

Messages: 6
Registered: October 2011

Junior Member

Hey,

It's probably a simple answer to this, but here goes. For a grammar that looks like this:

Model:
(elements += AbstractElement)*
;

AbstractElement:
PackageDeclaration | Class ;

PackageDeclaration:
'package' name = QualifiedName
'{'
(elements += AbstractElement)*
'}'
;

Class:
class' name = ID ('inherits' superType = [Class | QualifiedName]
(features += Feature)*
;

How can I refer to the compile function for PackageDeclaration and Class directly in the .xtend file? (Since AbstractElement is "between" Model and PackageDeclaration / Class.) Note that I start with Model.

The .xtend file looks like this:

def compile( Model m )
'''
«FOR ae : m.elements»
«ae.compile»
«ENDFOR»
'''

def compile( AbstractElement ae )
'''
«var x = o as Class» ???

'''

That is, how can I differentiate between the different abstract elements easily without casting, etc.? As an example, I would like to write the name of classes to file.

Tips are welcomed!

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Re: [xtend2] Creating a generator [message #754895 is a reply to message #754890]

Fri, 04 November 2011 19:53

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

what about using some Xtend "magic"

def compile( Model m )
'''
«FOR ae : m.elements»
«ae.compile»
«ENDFOR»
'''

def dispatch compile( PackageDeclaration p )
'''
'''

def dispatch compile( org.xtext.example.mydsl.myDsl.Class p )
'''
'''

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: [xtend2] Creating a generator [message #754912 is a reply to message #754895]

Fri, 04 November 2011 21:43

Peter

Messages: 6
Registered: October 2011

Junior Member

Christian Dietrich wrote on Fri, 04 November 2011 15:53

Hi,

what about using some Xtend "magic"

def compile( Model m )
'''
«FOR ae : m.elements»
«ae.compile»
«ENDFOR»
'''

def dispatch compile( PackageDeclaration p )
'''
'''

def dispatch compile( org.xtext.example.mydsl.myDsl.Class p )
'''
'''

~Christian

It was exactly something like this I was looking for! Thanks very much for your quick and precise help!

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