[antlr-interest] Puzzled by leading dot

[Alexey Demakov]

It is not correct if there are skipped whitespace
because "." WHITESPACE "SE" will be accepted.

Regards,
Alexey

-----
Alexey Demakov
TreeDL: Tree Description Language: http://treedl.sourceforge.net
RedVerst Group: http://www.unitesk.com


----- Original Message ----- 
From: "togol machillan" <togolmach2 at lycos.com>
To: <antlr-interest at antlr.org>
Sent: Tuesday, March 15, 2005 7:31 PM
Subject: Re: [antlr-interest] Puzzled by leading dot


> Writing the dot as a separate character like '.' might solve the problem.
> 
> Mach
> 
> 
> ----- Original Message -----
> From: "Juergen Weber" <weberjn at yahoo.com>
> To: antlr-interest at antlr.org
> Subject: [antlr-interest] Puzzled by leading dot
> Date: Tue, 15 Mar 2005 07:58:00 -0800 (PST)
> 
> > 
> > 
> > Hi,
> > 
> > I want to parse lines of the form
> > 
> > .SE DATE = '03.02.2005';.SE TIME = '20:17'
> > 
> > 
> > (basically a key value format, the .SE is to be
> > ignored).
> > 
> > If I parse the input with the grammar below, I got
> > this error message:
> > 
> > Exception in thread "main" line 1:1: unexpected char:
> > '.'
> > 
> > How could I specify a keyword with a leading dot?
> > 
> > Thanks for your help,
> > Juergen
> > 
> > 
> > 
> > 
> > class MyParser extends Parser;
> > 
> > 
> > line
> > : item (SEMI item)*
> > ;
> > 
> > item
> > : DOTSE IDENT "=" STRING_LITERAL
> > ;
> > 
> > 
> > 
> > class MyLexer extends Lexer;
> > 
> > tokens {
> >          DOTSE=".SE";
> > }
> > 
> > 
> > IDENT
> > : ('a'..'z'|'A'..'Z'|'_')
> > ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*
> > ;
> > 
> > 
> > 
> > STRING_LITERAL 
> > :
> > '\''
> > (~'\'')*
> > '\''
> > ;
> > 
> > 
> > SEMI: ';'
> > ;
> > 
> > 
> > 
> > 
> > 
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