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Terminal rule named INT not awaiting an Integer [message #982862]

Tue, 13 November 2012 13:31

Franck Malartic

Messages: 8
Registered: September 2012

Junior Member

Hello,

Just to let you know that I run into a problem by using a grammar with terminal rule defined like this :

terminal fragment SIGN               :   '+' | '-' ;
terminal fragment DIGIT              : ('0'..'9');
terminal INT returns ecore::ELong   : SIGN? DIGIT+;

Note that my grammar is not using common terminals (org.eclipse.xtext.common.Terminals).

The problem when parsing is a conversion exception : "java.lang.Integer cannot be cast to java.lang.Long".

With the debugger, it appears that org.eclipse.xtext.conversion.impl.AbstractDeclarativeValueConverterService#getConverter(String lexerRule) returns an instance of org.eclipse.xtext.conversion.impl.INTValueConverter instead of the DefaultTerminalConverter.

By changing the terminal rule name to LONG (or anything else) it works fine (so that is not a issue for me anymore).

I am not sure if this is bug or if INT is a some kind of reserved terminal rule name.
Hope that can help,
Regards,
franck

PS: using eclipse Indigo with xtext 2.2.1.

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Re: Terminal rule named INT not awaiting an Integer [message #982877 is a reply to message #982862]

Tue, 13 November 2012 13:43

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi you have to bind a proper ivalueconverterservice yourself

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Re: Terminal rule named INT not awaiting an Integer [message #982917 is a reply to message #982877]

Tue, 13 November 2012 14:28

Boris Brodski

Messages: 112
Registered: July 2009

Senior Member

Hi!

You can also watch this screencast about terminals and IValueConverters: http://xtextcasts.org/episodes/11-custom-terminals

In your special case you have to define a new terminal (LINT for example), IValueConverter and hide or reuse the INT terminal:

terminal fragment SIGN : '+' | '-' ;
terminal LINT returns ecore::ELong : SIGN? INT;

(untested)

Regards,
Boris

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