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Conflicting keywords and ID rules [message #1119573]

Sat, 28 September 2013 16:45

rohit ahuja

Messages: 27
Registered: February 2013

Junior Member

Hi All,

I am unable to use the keyword used in some rule, as the value of another,
For e.g.
Consider the below grammar

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals
generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Field:
'name' '=' name=ID ',' 'type' '=' type=ID ';'
;

Now if i try something like,
name = john , type = type;
we get error as mismatched input 'type' expecting RULE_ID, is there any way to allow this?

I saw that we can use the ^symbol, but i am looking for some other way if it exists.
name = john , type = ^type;

Any help would be great.

Thanks in Advance,
Rohit

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Re: Conflicting keywords and ID rules [message #1119583 is a reply to message #1119573]

Sat, 28 September 2013 17:00

Christian Dietrich

Messages: 13493
Registered: July 2009

Senior Member

Hi introduce a datatype rule:

XID: ID | "type";

.....

And use that one instead Of ID

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Re: Conflicting keywords and ID rules [message #1119584 is a reply to message #1119573]

Sat, 28 September 2013 17:01

Uli Merkel

Messages: 248
Registered: June 2013

Senior Member

there are keywords ans the XTEXT defaults for ID have a built-in way to solve the conflicht with the ^-prefix

I can't understand why you are looking for "some other ways"?

Accepting that keywords have to be keywords wherever they appear:
How do you want the solution to look like?

Or asked the other way: what's worng with the keyword=^keyword

if all you want is to use another character instead of the "^",
just have a look at the ID definitions and create your own MYID
(and adjust a couple of Java Rpoutines to handle the other character)

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Re: Conflicting keywords and ID rules [message #1120026 is a reply to message #1119584]

Sun, 29 September 2013 05:00

rohit ahuja

Messages: 27
Registered: February 2013

Junior Member

Christian, Thanks for the reply, it works like a charm!!!

Merkel, i am looking for some other way, as the grammar that i am writing has some legacy cases wherein we need to support this, i understand that it is a keyword, and the ^ symbol is an ex excellent way, but there's no way i can edit the old legacy cases, so i just reproduced the same with a small sample above, and looked for some other workaround..

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Re: Conflicting keywords and ID rules [message #1120090 is a reply to message #1120026]

Sun, 29 September 2013 06:45

Uli Merkel

Messages: 248
Registered: June 2013

Senior Member

ahuja, you have not answered my question:

what other workaround you are looking for?

As long as you can not answer this question, one can not help you.

It may be helpful to be more detailed about "the old legacy cases"

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