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EBNF how to specify a list separated by commas [message #47906]

Thu, 04 June 2009 08:04

Eclipse User

Hello

I am having trouble specifying a comma separated list of elements, would
you know how to do this in EBNF for Xtext?

I have in my EBNF:

TOperation :
name=ID ( "(" (listOfArguments+=TArgument")" )? ;

TArgument : type=TDataType name=ID;

I would like to have the arguments separated by a comma.
for example:
operation1(myBoolean arg1, myBoolean arg2);

The arguments must be contained in the "listOfArguments" variable in
TOperation.

Any help would be appreciated,

Kind regards.

Re: EBNF how to specify a list separated by commas [message #47936 is a reply to message #47906]

Thu, 04 June 2009 08:05

Eclipse User

Sorry let me revise my grammar declaration...

> TOperation :
> name=ID ( "(" (listOfArguments+=TArgument)* ")" )? ;

> TArgument : type=TDataType name=ID;

Re: EBNF how to specify a list separated by commas [message #47965 is a reply to message #47906]

Thu, 04 June 2009 08:30

Eclipse User

Typically one writes something like this:

TOperation :
name=ID ( "(" listOfArgs+=TArgument (',' listOfArgs+=TArgument)* ")" )?;

Cheers,
Sven

dw schrieb:
> Hello
>
> I am having trouble specifying a comma separated list of elements, would
> you know how to do this in EBNF for Xtext?
>
> I have in my EBNF:
>
> TOperation :
> name=ID ( "(" (listOfArguments+=TArgument")" )? ;
>
> TArgument : type=TDataType name=ID;
>
> I would like to have the arguments separated by a comma.
> for example:
> operation1(myBoolean arg1, myBoolean arg2);
>
> The arguments must be contained in the "listOfArguments" variable in
> TOperation.
>
> Any help would be appreciated,
>
> Kind regards.
>

Re: EBNF how to specify a list separated by commas [message #47996 is a reply to message #47936]

Thu, 04 June 2009 08:31

Eclipse User

Please ignore my previous post, I didnt know that this was possible:

TOperation :
name=ID ( '(' (arguments+=TArgument (',' arguments+=TArgument)*)? ')'
)?
;

It appears to work!

Re: EBNF how to specify a list separated by commas [message #48025 is a reply to message #47965]

Thu, 04 June 2009 08:39

Eclipse User

Many thanks Sven.

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