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Value Converters in Xtext [message #1114705]

Mon, 23 September 2013 01:15

Eclipse User

Hello all,
Can we use Value Convertes in xtext for the rules which are not terminal?
If yes then , Can someone let me know how do I do it ?

Thanks in advance Smile

Re: Value Converters in Xtext [message #1114711 is a reply to message #1114705]

Mon, 23 September 2013 01:21

Eclipse User

Hi

I guess you are not talking about data type rules (which are actually
parsed)

For the rest: no.

Can you give some more hints on your usecase

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Re: Value Converters in Xtext [message #1114718 is a reply to message #1114711]

Mon, 23 September 2013 01:39

Eclipse User

Hi Christian,
Thanks for your reply Smile

Ok Let me explain you my use case,

I have a grammar something like:

SomeExpression:
SomeOtherExpr (rest part of the grammar);

SomeOtherExpr:
SomeAnotherExpr (rest part of the grammar);

SomeAnotherExpr:
INT | DOUBLE| LONG ;

For me , SomeExpression rule will return some value at the end which I am interested in.
So can I write the value converter for SomeExpression ?

Thanks in advance Smile

Re: Value Converters in Xtext [message #1114723 is a reply to message #1114718]

Mon, 23 September 2013 01:44

Eclipse User

hi,

the problem is; your snippet is incomplete, you dont use assignments, so i cannot say.
if you dont use assignment then rulecalls mean "is a" and thus inheritance

SomeOtherExpr:
value=SomeAnotherExpr (rest part of the grammar);

SomeAnotherExpr:
INT | DOUBLE| LONG ;

Re: Value Converters in Xtext [message #1114751 is a reply to message #1114723]

Mon, 23 September 2013 02:42

Eclipse User

Hi Christian,
I missed one point.
In my grammar, I have the assignment like:
value=SomeExpression
And this SomeExpression has sub rules and assignments as written above.
I want to write a value Converter for this SomeExpression. I tried writing it. The method is getting called but I get string as null value in toValue(final String string, final INode node) method.
Any suggestions??

Thanks in advance Smile

Re: Value Converters in Xtext [message #1114755 is a reply to message #1114751]

Mon, 23 September 2013 02:46

Eclipse User

Please show all relevant parts of the grammar.
Strip it down to a simple example grammar.

Please note: do not use any assignments In datatye rules.BTW your
type is string (the grammar snippet indicates that)

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