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Syntactic predicates [message #1623051]

Wed, 18 February 2015 22:47

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi guys,

Currently I have one grammar which is recursive and it is using a lot of syntactic predicates, I am only using the operator => because I read about the operator -> but I am not sure about its behaviour.

Could you help me to understand the main difference between these operators? Also I wanted to ask you if there is a way of avoiding using predicates in my alternatives because I have one rule which was written in this way

Atomic returns Expression:
=>Literal | =>Variable | =>ObjectExpression | =>Array | EnclosedExpression;

It does not look good for sure there is a better way of writing this.

Thanks in advance.

Regards,
Luis

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Re: Syntactic predicates [message #1624168 is a reply to message #1623051]

Thu, 19 February 2015 16:02

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi guys,

Anyone has any idea about this?

Thanks

Best Regards

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Re: Syntactic predicates [message #1624174 is a reply to message #1624168]

Thu, 19 February 2015 16:05

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

The General usage and the difference between => and -> is decribed in the docs under "Syntactic Predicates"
why you have that lot predicates i cannot see.
in all literal rules i have seen so for non of them is used (dont know your grammar so hard to say)

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

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