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 <[email protected]>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: [email protected]
> [mailto:[email protected]] On Behalf Of G. Richard Bellamy
> Sent: Wednesday, July 27, 2011 1:49 PM
> To: [email protected]
> 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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