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Comment line rule in Xtext [message #63002]

Sat, 25 July 2009 02:56

Eclipse User

Since Comment lines can appear anywhere, what is an ideal grammer to
include in the Model for accommodating this?

Should all Sections be apppended with a (COMMENT)* option?

Grammer would look too awkward if I do it like that. Any help

regards
Binu K Idicula

Re: Comment line rule in Xtext [message #63004 is a reply to message #63002]

Sat, 25 July 2009 12:57

Eclipse User

Idicula wrote:
> Since Comment lines can appear anywhere, what is an ideal grammer to
> include in the Model for accommodating this?

Xtext includes default terminals for single-line and multi-line comments
that are in the C-style.
http://www.eclipse.org/Xtext/documentation/latest/xtext.html #Defaulttokens

You can override these in your grammar by specifying a terminal rule
with the same name. If you make any terminal 'hidden', it's not
necessary to specify it in grammar rules as its token becomes hidden
from the parser.

>
> Should all Sections be apppended with a (COMMENT)* option?
>
> Grammer would look too awkward if I do it like that. Any help
>
> regards
> Binu K Idicula
>

Re: Comment line rule in Xtext [message #63006 is a reply to message #63002]

Sat, 25 July 2009 12:58

Eclipse User

Binu,

Comment lines are handled very nicely by default. See the Hidden
terminal symbols section in the docs and
http://www.eclipse.org/Xtext/documentation/0_7_0/xtext.html# Defaulttokens.

Were

you tying to customize the behavior?

Miles

On 2009-07-24 23:56:39 -0700, binu.idicula@wipro.com (Idicula ) said:

> Since Comment lines can appear anywhere, what is an ideal grammer to
> include in the Model for accommodating this?
>
> Should all Sections be apppended with a (COMMENT)* option?
>
> Grammer would look too awkward if I do it like that. Any help
>
> regards
> Binu K Idicula

Re: Comment line rule in Xtext [message #63017 is a reply to message #63002]

Mon, 27 July 2009 03:13

Eclipse User

Hi Idicula,

the default behaviour of Xtext for comments should work pretty fine
except from the case where you want line comments to be part of your
semantic model. If that is your use case, you should go with the
"awkward" grammar.

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 25.07.2009 8:56 Uhr, schrieb Idicula:
> Since Comment lines can appear anywhere, what is an ideal grammer to
> include in the Model for accommodating this?
>
> Should all Sections be apppended with a (COMMENT)* option?
>
> Grammer would look too awkward if I do it like that. Any help
>
> regards
> Binu K Idicula
>

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