[Grammatica-users] AW: Grammatica-users Digest, Vol 55, Issue 2

[Schilha, Matthias]

Hi Per,

Thank you for your response.

I simplified my expression to this now to accept: a='b' :

%header%

GRAMMARTYPE = "LL"

%tokens%

EQ = "="
SINGLE_QUOTE = "'"
IDENTIFIER = <<[a-z]>>

%productions%

Expression = IDENTIFIER EQ SINGLE_QUOTE IDENTIFIER SINGLE_QUOTE;  


It doesn't work. What the expression accept is: a=b 

Have you got another idea. Thanks in advanced.

Matthias


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Von: address@hidden [mailto:address@hidden Im Auftrag von address@hidden
Gesendet: Donnerstag, 24. März 2011 17:01
An: address@hidden
Betreff: Grammatica-users Digest, Vol 55, Issue 2

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Today's Topics:

   1. Re: Grammar with single-quoted stings (Per Cederberg)


----------------------------------------------------------------------

Message: 1
Date: Wed, 23 Mar 2011 18:52:58 +0100
From: Per Cederberg <address@hidden>
Subject: Re: [Grammatica-users] Grammar with single-quoted stings
To: "address@hidden" <address@hidden>
Message-ID:
        <address@hidden>
Content-Type: text/plain; charset=UTF-8

Your regex for whitespace seems to include an accidental extra char at the end.

Cheers,

/Per

On Wednesday, March 23, 2011, Schilha, Matthias <address@hidden> wrote:
> Hi,
>
> i want to write a grammar to accept strings like this: a = 'b'
>
> To do that, I write this grammar:
>
> %header%
>
> GRAMMARTYPE = "LL"
>
> %tokens%
>
> EQ Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  
> Â  Â  = "="
>
> S_QUOTE Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â = "'"
>
> NUMBER Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  = <<[0-9]+>> IDENTIFIER Â  Â  
>               = <<'[A-Za-z§][A-Za-z0-9_§]*>> WHITESPACE     
> Â  Â  Â  Â  Â  Â  Â  = <<[ \t\n\r]+'>> %ignore%
>
>
> %productions%
>
>
> Expression = IDENTIFIER AtomComparisonTail;
>
> AtomComparisonTail = Comparison Atom
>  Â  Â  Â  Â  Â  Â  Â  Â | Comparison "'" Atom "'";
>
> Comparison = "=";
>
> Atom = NUMBER
>  Â  Â  | IDENTIFIER;
>
>
> But it doesn't work. I get the message: unexpected character ''', on 
> line: 1 column: 3
>
> In this way I changed my grammar to
>
> %header%
>
> GRAMMARTYPE = "LL"
>
> %tokens%
>
> EQ Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  
> Â  Â  = "="
>
> S_QUOTE Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â = "'"
>
> QUOTED_STRING Â  Â  Â  Â  Â  Â  Â  Â = <<('[^']*')>> NUMBER Â  Â  Â  Â  
> Â  Â  Â  Â  Â  Â  Â  = <<[0-9]+>> IDENTIFIER Â  Â  Â  Â  Â  Â  Â  Â  Â  
> = <<'[A-Za-z§][A-Za-z0-9_§]*>> WHITESPACE                   
> = <<[ \t\n\r]+'>> %ignore%
>
>
> %productions%
>
>
> Expression = IDENTIFIER AtomComparisonTail;
>
> AtomComparisonTail = Comparison Atom
>  Â  Â  Â  Â  Â  Â  Â  Â | Comparison QUOTED_STRING Atom QUOTED_STRING;
>
> Comparison = "=";
>
> Atom = NUMBER
>  Â  Â  | IDENTIFIER;
>
> But it is still not working.
>
> Have someone another idea to solve this problem.
>
> Thank you very much.
> Matthias
>
> _______________________________________________
> Grammatica-users mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/grammatica-users
>

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