Re: getting a copy of all characters flex has processed

[John P. Hartmann]

Not what you asked for (each keystroke individually), but look into

#define YY_USER_ACTION

It has ytext and yyleng for you.

On 4/26/19 11:26, Rainer Gerhards wrote:
> Hi there,
>
> sorry if there is an obvious solution - I didn't find it.
>
> I have a config file parser created with flex/bison. It includes
> "include" functionality. Includes works with files as well as
> user-provided strings (via yy_scan_buffer()).
>
> As an end-user debugging tool, I would like to optionally generate a
> single output file which contains the full configuration with the
> includes expanded.
>
> E.g. I have
> file1:
> f1l1
> f1l2
> include file 2
> f1l3
> include text "included text"
> f1l4
>
> file2:
> f2l1
>
> Output file should be:
> f1l1
> f1l2
> f2l1
> f1l3
> included text
> f1l4
>
> I would like to generate that output file during regular configuration
> processing. So in short I need a capability to see each character that
> flex processes at exactly the time it processes the character. I did
> not find a documented override to do this.
>
> Is there any way to handle this with flex?
>
> Any help is deeply appreciated.
> Rainer
>
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