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Cross Reference to nested Elements [message #879930]

Fri, 01 June 2012 06:36

Julian Faupel

Messages: 2
Registered: June 2012

Junior Member

Hi,

i have written the following grammar.

Module:
	'Modul' name=ID
		(forms+=Formular)+
		dependency=Dependency
	'ModulEnde';

Dependency:
	'Ablauf'
		conditions+=Condition+
	'AblaufEnde'
;

Condition:
	(field=[Field]) (type=ConditionType) '->' (targetElement=[FormElement])

;

Formular:
	'Formular' name=ID
		(formlabel=Label)? 
		(elements+=FormElement)*
	'FormularEnde';

FormElement:
	Field | Orgbox;

Orgbox:
	'OrgEinheit' name=ID  
		(label=Label)?
		(elements+=FormElement)*
	'OrgEinheitEnde';

Field:
	'Feld' (type='optional'|'looping')? name=ID ('maps' model=ModelElement)? 
          ...
	'FeldEnde';

My problem is that the rule "Condition" cannot reference to a "Field" or a "FormElement" which is nested in the "Formular" Element.

Any idea how i can solve this problem?

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Re: Cross Reference to nested Elements [message #879935 is a reply to message #879930]

Fri, 01 June 2012 06:47

Christian Dietrich

Messages: 14736
Registered: July 2009

Senior Member

Hi,

the problem is that xtext by default uses fully qualified names for cross refs
=>

(a) change the grammar to accept fqns

Condition:
	(field=[Field|FQN]) (type=ConditionType) '->' (targetElement=[FormElement|FQN])

;

FQN: ID ("." ID)*;

(b) use a custom IQualifiedNameProvider that gives stuff simple names.

For some basic /advanced reading have a look at http://blogs.itemis.de/stundzig/archives/773

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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