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Enum as attribute value [message #1829651]

Wed, 08 July 2020 05:35

Eclipse User

Hello Gang

I try to implement small dsl. The part of grammar is

enum XEnum:
	XXX='XXXX' |
	YYY='YYYY; 

Attribute:
        name='A' '=' value=INT ';'
	name='wrong_something' '=' XEnum ';' 
       name='B' '=' value=INT ' ;'
	;

And I observe the error in message for attribute wrong_something : " Cannot call enum rule without assignment"

Where is my error?

Thnak you in advance

Re: Enum as attribute value [message #1829652 is a reply to message #1829651]

Wed, 08 July 2020 05:37

Eclipse User

you use

XEnum ';'

and not

value=XEnum ';'

Re: Enum as attribute value [message #1829653 is a reply to message #1829652]

Wed, 08 July 2020 05:42

Eclipse User

I tried to use this variant and

name='wrong_something'  '='  value=XEnum ';'

and observe : "Cannot find compatible type for the feature 'value' (ErrorCode: NoCompatibleFeatureTypeAvailable)"

[Updated on: Wed, 08 July 2020 05:43] by Moderator

Re: Enum as attribute value [message #1829654 is a reply to message #1829653]

Wed, 08 July 2020 05:48

Eclipse User

i assume this is cause there is no common type for enum and int so you would need enumValue=XEnum

[Updated on: Wed, 08 July 2020 05:48] by Moderator

Re: Enum as attribute value [message #1829656 is a reply to message #1829654]

Wed, 08 July 2020 06:59

Eclipse User

Thanks

Re: Enum as attribute value [message #1829659 is a reply to message #1829656]

Wed, 08 July 2020 07:18

Eclipse User

Another question I added one more enum in my grammar. I observe that the second enum is cause of error. Example

 
enum XEnum:
	XXX='XXXX' |
	YYY='YYYY; 
enum YEnum:
	XXX='XXXX' |
	YYY='YYYY; 

Attribute:
        name='A' '=' value=INT ';' |
	name='wrong_something' '=' enumValue=XEnum ';' |
        name='wrong_something2' '=' enumValue=YEnum ';' |
       name='B' '=' value=INT ' ;'
	;

Build failed with message : "Cannot find compatible type for the feature 'enumValue'" for the second enum

The next stupid code is built ok

enum XEnum:
	XXX='XXXX' |
	YYY='YYYY; 
enum YEnum:
	XXX='XXXX' |
	YYY='YYYY; 

Attribute:
        name='A' '=' value=INT ';' |
	name='wrong_something' '=' enumValue=XEnum ';'  |
        name='wrong_something2' '=' enumValue=XEnum ';' |
       name='B' '=' value=INT ' ;'
	;

[Updated on: Wed, 08 July 2020 07:20] by Moderator

Re: Enum as attribute value [message #1829666 is a reply to message #1829659]

Wed, 08 July 2020 08:45

Eclipse User

I've added return statement into both enum definitions then grammar start to work

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