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conflict between 'literals' and qualifiednames [message #554755]

Tue, 24 August 2010 10:50

F. Alexander Njemz

Messages: 20
Registered: July 2010

Junior Member

Hi,

say I have rules like

Model:
    'model' name=ID ...

QualifiedName:
    ID ('.' ID)*;

.

It now is impossible to use 'model' in qnames like 'org.example.model.myModel' because Xtext seems to interpret the 'model' in the qname as the beginning of the Model-rule. Is there a workaround?

Thanks.

Regards,

Alexander

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Re: conflict between 'literals' and qualifiednames [message #554759 is a reply to message #554755]

Tue, 24 August 2010 11:08

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hello Alexander,

what about

Model:
    'model' name=ID fqn=QualifiedName;

QualifiedName:
    ('model' | ID) ('.' ('model' | ID))*;

Regards
Christian

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

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Re: conflict between 'literals' and qualifiednames [message #554764 is a reply to message #554755]

Tue, 24 August 2010 11:12

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

this is a standard problem as keywords are keywords wherever they
appear. You either introduce a separate data type rule for ID+keywords

IdOrKeywords: ID|'model';

and use IdOrKeyword wherever you would have used ID before or you simply
put it in the QualifiedName rule

QualifiedName: (ID|'model') ('.' (ID|'model'))*;

Note that you also can escape keywords.

^model will not be read as the keyword "model" but an ID with string
value "model". The caret is removed by the value converter.

Alex

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