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Custom validation in xtext [message #1424566]

Tue, 16 September 2014 01:50

Eclipse User

Hi all,
Part of my grammar looks something like this:

rule1:
	"ruleName" name=ID
	"{"
		"enum1" e1=Enum1
		"enum2" e2=Enum2
	"}"
;


Enum1:
	value=INT "=" name=ID 
;

enum Enum2:
	TRUE|FALSE
;

Language would look something like:

"ruleName" name1
	{
		"enum1" 2=enumName1
		"enum2" TRUE
	}

But one problem is that:
I can define Enum1 as,

"enum1" 2=TRUE or "enum1" 2=FALSE also, which will give me an xtext error automatically as TRUE/FALSE are part of enum.
But I want to put a CUSTOM VALIDATION ERROR here.
When I tried to read Enum1 in the background , it gives me a null value i.e. it gives "2=null".

How to solve this?

Thanks in advance Smile

Re: Custom validation in xtext [message #1424568 is a reply to message #1424566]

Tue, 16 September 2014 01:55

Eclipse User

Hi Arshad,
to avoid conflicts with keywords, there is a special form of ID starting with a "^".

"enum1" 2=^TRUE will do the job for you.

Greetings from Frankfurt/Germany, Uli

Re: Custom validation in xtext [message #1424594 is a reply to message #1424568]

Tue, 16 September 2014 02:42

Eclipse User

Hi Uli,
Thanks for your reply.
Yes I have made use of this special ID.

But the solution you have proposed follows- prevent it before it is happened.

But what I want is, say that intentionally I have typed it wrong and I want get this data in the validator which is giving me currently null.

Any suggestions for this ?

Thanks .. Smile

Greetings from Bangalore/INDIA

[Updated on: Tue, 16 September 2014 02:43] by Moderator

Re: Custom validation in xtext [message #1424612 is a reply to message #1424594]

Tue, 16 September 2014 03:20

Eclipse User

Hi,

you can always use nodeModelUtil to access the "textual" tree