[antlr-interest] Tokens match more characters than they should.

[Chris Dew]

Correction: "fooabarb cwibble" forms 'foo' 'abar' 'b cwibble' - I had
inadvertently added a space.

On 31/03/2008, Chris Dew <chris at sidwells.com> wrote:
>
> I'm sure that this is an error in my understanding, as I'm new to antlr.
> Hopefully someone can point out my mistake.  I'm using ANTLRWorks 1.1.7,
> (which says that it is for antlr v3 grammars).
>
> I believe the grammar, attached at the end of the email, should only match
> "foo bar wibble".  The *interpreter* (built into ANTLRWorks) matches many
> more characters than I expect.  For example: "fooabarb cwibble" seems to be
> valid.  It forms 'foo' 'a bar' 'b cwibble'.  Does anyone know why?
>
> Thanks,
>
> Chris.
>
> P.S. The grammar is just a toy grammer, which illustrates a problem I have
> with a much more complicated grammar.
>
>
>
> grammar test;
>
> command    :    FOO BAR WIBBLE    ;
>
> FOO    :    'foo'        ;
> BAR    :    'bar'        ;
> WIBBLE    :    'wibble'    ;
>
> WS    :    (' '|'\r'|'\n')+ {$channel = HIDDEN;} ;
>
>
>
>
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