[ragel-users] "scanner error"

[Adrian Thurston]

Oh sorry I misunderstood. I get it now. Thanks for the report.

-Adrian

On 14-06-28 11:47 AM, Josh Haberman wrote:
> HI Adrian,
>
> I wasn't meaning to suggest that my test case was valid Ragel input. I
> sent the repro because the Ragel source contains this comment where
> this error message is generated:
>
>    /* Machine failed before finding a token. I'm not yet sure if this
>     * is reachable. */
>    scan_error() << "scanner error" << endl;
>    exit(1);
>
> Since you weren't sure whether this error is reachable, I thought it
> would be useful to you to know that it is indeed reachable, and to
> have a repro for how it can be reached.
>
> Also, the error message "scanner error" isn't a very useful
> diagnostic; I was hoping that a repro would make it easier to emit an
> error message that helps the user know what they did wrong.
>
> It also refers to a source location that doesn't actually exist
> (test.rl:2:10) -- in my test input, line 2 only has 7 columns.
>
> Hope this is helpful,
> Josh
>
> On Sat, Jun 28, 2014 at 6:46 AM, thurston <thurston at complang.org> wrote:
>> Hi Josh, those are unterminated write statements. Two percents begin ragel
>> code.
>>
>>
>> -------- Original message --------
>> From: Josh Haberman
>> Date:06-28-2014 4:40 AM (GMT-05:00)
>> To: ragel-users at complang.org
>> Subject: [ragel-users] "scanner error"
>>
>> I was trying out Ragel for the first time today and run into the
>> somewhat perplexing error message "scanner error".
>>
>> Since the code contains a comment questioning whether this error is
>> reachable, I wanted to give you a repro that reaches it -- here's my
>> reduced test case:
>>
>> %%machine m;
>> %%write
>> %%write
>>
>> $ ragel -C -o test.out test.rl
>> test.rl:2:10: scanner error
>>
>> This repro is for 6.8 (git appears to be 6.7 -- source repo is older?)
>>
>> Josh
>>
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