[ragel-users] "scanner error"

[Josh Haberman]

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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