[antlr-interest] Re: probably too obvious to see it - plz help
tdjastrzebski
tdjastrzebski at yahoo.com
Thu Jul 31 17:53:31 PDT 2003
It should choose StringLiteral when 'n' is followed by '\''.
So how do I fix it ?
Tom Jastrzebski
--- In antlr-interest at yahoogroups.com, mzukowski at y... wrote:
> So if it sees "n" which rule is it supposed to choose? You need to
handle
> the two possibilities prefixed with 'n' in one rule.
>
> Monty
>
> -----Original Message-----
> From: tdjastrzebski [mailto:tdjastrzebski at y...]
> Sent: Thursday, July 31, 2003 4:14 PM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] probably too obvious to see it - plz help
>
>
> I ma probably too tireed to see it. Why following two lexer rules
> cause nondeterminism (k=2).
>
> Identifier
> : ('a'..'z')+
> ;
> StringLiteral
> : ('n')? '\'' (~'\'')* '\''
> ;
>
> StringLiteral rule is supposed to match unicode strings like:
> n'blabla'
>
> Thanks in advance.
> Tom Jastrzebski
>
> full test grammar:
>
> options {
> language = "Java";
> }
>
> class TestParser extends Parser;
> options {
> k = 2;
> }
>
> expression
> : (Identifier | StringLiteral) EOF
> ;
>
> class TestLexer extends Lexer;
> options {
> k = 2;
> }
>
> Identifier
> : ('a'..'z')+
> ;
>
> StringLiteral
> : ('n')? '\'' (~'\'')* '\''
> ;
>
>
>
>
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