Re: [Grammatica-users] Grammar for expression...?

[Yakov Keselman]

If I understand your difficulties correctly, you're unable to come up with a BNF grammar for your scripting language. My suggestion is to learn from "realistic" examples. For example, here is a link to a specificiation of the Java programming language in BNF: http://www.csm.astate.edu/java-grammar.html

 

You can also try finding similar specs for other programming languages that you know.

 

I don't know of any general technique that would allow generating a BNF grammar out of an existing language.

 

= Yakov

Morten Aune Lyrstad <address@hidden> wrote:

> I have downloaded Grammatica for use with my scripting language 
> Storyteller. I have serious problems understanding
>  the more advanced 
> grammar. I need to extend the _expression_ grammar you have given in your 
> example:
>
> _expression_ = Term [ExpressionTail] ;
>
> ExpressionTail = "+" _expression_
> | "-" _expression_ ;
>
> Term = Factor [TermTail] ;
> TermTail = "*" Term
> | "/" Term ;
>
> Factor = Atom
> | "(" _expression_ ")" ;
>
> Atom = NUMBER
> | IDENTIFIER ;
>
>
> into one that is capable of handling all of a programming language's 
> common operators, like 'and', 'or', > etc. However, I don't really 
> understand what is going on here, and because of that I cannot extend 
> it. Why are the operators divided into two "tails"? And does this 
> support unary operators? Where should I add my other operators?
>
> I was hoping you could give me a hand?
>
> Thank you,
> Morten
>
>
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>  list
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http://www.kinderspirit.org/yakovkeselman/

====

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