[antlr-interest] Quoted String Literal - confused by greed=false behavior.

[Bart Kiers]

And by default, greedy=true (except with .* and .+), so in this case, one
could simply write

STRING_LITERAL
  :  '"' ('""' | ~'"')* '"'
  ;


AFAIK.

Regards,

Bart.


On Wed, Jul 27, 2011 at 9:54 PM, Sam Harwell <sharwell at pixelminegames.com>wrote:

> You're reading the greedy option in reverse. :) I'd write the rule this
> way:
>
> STRING_LITERAL
>        :       '"'
>                (       options{greedy=true;}
>                :       '""'
>                |       ~'"'
>                )*
>                '"'
>        ;
> Sam
>
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org
> [mailto:antlr-interest-bounces at antlr.org] On Behalf Of G. Richard Bellamy
> Sent: Wednesday, July 27, 2011 1:49 PM
> To: antlr-interest at antlr.org
> Subject: [antlr-interest] Quoted String Literal - confused by greed=false
> behavior.
>
> I've got a lexer rule that should be gobbling everything after the double
> quote '"' except for the last double quote - I basically stole the rule
> from
> a post from Jim Idle
> (http://www.antlr.org/pipermail/antlr-interest/2010-March/038051.html).
>
> I've also tried other variations on the same rule, and I'm a bit confused
> as
> it seems the {greedy=false;} option is being ignored.
>
> Any help is appreciated
>
> -----------------------------------------------
> INPUT: @"(FOO="")"
> -----------------------------------------------
>
> lexer grammar Lexer
>
> options
> {
>     language=CSharp3;
>     TokenLabelType=CommonToken;
> }
>
> DQUOTE : '"';
>
> STRING_LITERAL
>     : DQUOTE (options { greedy = false; }
>          : (
>             (
>                 {input.LA(1) == '"' && input.LA(2) == '"'}? DQUOTE DQUOTE
>                 | ~DQUOTE
>             )*
>         )
>     )
>     DQUOTE
>     ;
> -----------------------------------------------
>
> LEXER TRACE (excerpt):
> enter STRING_LITERAL " line=1:7
> enter DQUOTE " line=1:7
> exit DQUOTE ) line=1:8
> enter DQUOTE ? line=1:9
> exit DQUOTE ? line=1:9
> exit STRING_LITERAL ? line=1:9
> line 1:10 mismatched character '<EOF>' expecting '"'
>
>
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