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Exclude keywords in certain context [message #922627]

Tue, 25 September 2012 03:21

Eclipse User

In some certain rules, I want to treat some keywords as normal ID. How do I do that? For example:

ENUM:
    'enum' ID '{' ( literal = ID ('=' INT)? ','? )+  '}' ';'

FREE:
    'FREE' ID ';'

Example code of the above grammar should be like this:

enum State {
      BUSY = 1,
      FREE
}

I declared 'FREE' as a keyword. Xtext will highlight 'FREE' in enum as an error and require me to write according to FREE rule. How can I exclude FREE rule in ENUM rule?

Re: Exclude keywords in certain context [message #923412 is a reply to message #922627]

Tue, 25 September 2012 18:27

Eclipse User

SomeRule : ID | FREE | ...;

- henrik

On 2012-25-09 24:21, Tu Do wrote:
> In some certain rules, I want to treat some keywords as normal ID. How
> do I do that? For example:
>
> ENUM:
> 'enum' ID '{' ( literal = ID ('=' INT)? ','? )+ '}' ';'
>
> FREE:
> 'FREE' ID ';'
>
> Example code of the above grammar should be like this:
>
> enum State {
> BUSY = 1,
> FREE
> }
> I declared 'FREE' as a keyword. Xtext will highlight 'FREE' in enum as
> an error and require me to write according to FREE rule. How can I
> exclude FREE rule in ENUM rule?

Re: Exclude keywords in certain context [message #923716 is a reply to message #923412]

Wed, 26 September 2012 02:12

Eclipse User

Henrik Lindberg wrote on Tue, 25 September 2012 18:27

SomeRule : ID | FREE | ...;

- henrik

On 2012-25-09 24:21, Tu Do wrote:
> In some certain rules, I want to treat some keywords as normal ID. How
> do I do that? For example:
>
> ENUM:
> 'enum' ID '{' ( literal = ID ('=' INT)? ','? )+ '}' ';'
>
> FREE:
> 'FREE' ID ';'
>
> Example code of the above grammar should be like this:
>
> enum State {
> BUSY = 1,
> FREE
> }
> I declared 'FREE' as a keyword. Xtext will highlight 'FREE' in enum as
> an error and require me to write according to FREE rule. How can I
> exclude FREE rule in ENUM rule?

I thought of that before, but I think it will highlight the keywords, and I don't want it to be highlighted.

Re: Exclude keywords in certain context [message #923731 is a reply to message #923716]

Wed, 26 September 2012 02:30

Eclipse User

Hi,

you can adapt highlighting

~Christian

Re: Exclude keywords in certain context [message #923761 is a reply to message #923731]

Wed, 26 September 2012 03:13

Eclipse User

Christian Dietrich wrote on Wed, 26 September 2012 02:30

Hi,

you can adapt highlighting

~Christian

As far as I know, I can only highlight static keyword. The highlighted keyword will be applied everywhere it is seen in my language. So, if every constant in my enum type is highlighted with Black, except a constant which is highlighted as red. If I highlighted the keyword to be the same as the constants, it will lose the keyword markup.

Certainly, I don't want to markup constant elements of enum the same as my keywords. Or is there a way to highlight according to the current rule?

[Updated on: Wed, 26 September 2012 03:16] by Moderator

Re: Exclude keywords in certain context [message #923848 is a reply to message #923761]

Wed, 26 September 2012 04:41

Eclipse User

You can fix this using semantic highlighting. We do this in our
project - I cannot give you the code for copyright issues

--
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Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

Re: Exclude keywords in certain context [message #923849 is a reply to message #923761]

Wed, 26 September 2012 04:42

Eclipse User

Re: Exclude keywords in certain context [message #924142 is a reply to message #923848]

Wed, 26 September 2012 10:46

Eclipse User

On 2012-26-09 1:41, Christian Dietrich wrote:
> You can fix this using semantic highlighting. We do this in our project
> - I cannot give you the code for copyright issues
>
For an example look at
org.cloudsmith.geppetto.pp.dsl.ui.coloring.PPSemanticHighlightingCalculator
in project cloudsmith / geppetto @ github - it uses several different
ways of highlighting.

- henrik

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