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How to build a correct grammar without conflicting keywords and ID's [message #1115679]

Tue, 24 September 2013 12:27

Joerg Thiemer is currently offline

Friend

Messages: 10
Registered: July 2010

Junior Member

Hello,

I'm not so familiar with ANTLR grammar and I have the following problem.

Here's a snipped of my grammar:

Model:
(alias+=Alias | field+=FieldFormat)*
;
Alias:
'alias' alias=ID string=ID
;

FieldFormat: {FieldFormat}
'format' typ=FormatType?
;

FormatType:
('r'|'z'|'l')
;

How can I avoid that

'alias r anytext' causes an error 'extraneous input 'r' expecting RULE_ID
or at
'alias f format' - 'missing RULE_ID at 'format'

Thank you
Joerg

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Re: How to build a correct grammar without conflicting keywords and ID's [message #1115683 is a reply to message #1115679]

Tue, 24 September 2013 12:32

Christian Dietrich is currently offline

Christian Dietrich

Friend

Messages: 14665
Registered: July 2009

Senior Member

Hi,

you have to introduce an datatype rule e.g.

XID: ('r'|'z'|'l'|ID);

Alias:
'alias' alias=XID string=XID
;

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: How to build a correct grammar without conflicting keywords and ID's [message #1116230 is a reply to message #1115683]

Wed, 25 September 2013 05:57

Joerg Thiemer is currently offline

Friend

Messages: 10
Registered: July 2010

Junior Member

Thank you, it works...

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