Re: [gtk-list] Re: g_scanner funtions what for?

[Andreas Tille <tille physik uni-halle de>]

On Fri, 12 Mar 1999, Tim Janik wrote:

> your modifications:
> 
> /* some test text to be fed into the scanner */
> static const gchar *test_text =
> ( "Datum: 02-16-1999\n"
>   "Probenname: Hans_1\n"
>   "Modulator f: 500.0\n"
Changed to: Modulator_f
>   "Schwingkreis f: 500.0\n"
Changed to: Schwingkreis_f
>   "Schwingkreis U: 5.0\n"
Changed to: Schwingkreis_U
>   "Temperatur: 25.0\n"
>   "Trigger-Delay: -400\n"
Changed to: Trigger_Delay
>   "Punktzahl: 8192\n"
>   "Messzeit: 2.0e-006\n" );
> 
> "Schwingkreis f" can't be scanned as a single token, because a GScanner
> will skip spaces by default and not feature spaces as a valid symbol char.
> 
> when you create a new scanner, g_scanner_new() accepts a pointer to a
> GScannerConfig structure that contains various default values for its
> scanning behaviour. if you pass that structure as NULL, gscanner.c will
> revert to a default structure, defined in gscanner.c:
I hope to fit the requirements for the tokens so far.  Note that I
didn't ended the lines with ';' (is this required?).
 
> also, you have to adapt parse_symbol() so it parses tokens other than float as
> well, instead of:
> 
>   /* expect a valid symbol */
>   g_scanner_get_next_token (scanner);
>   symbol = scanner->token;
>   if (symbol < SYMBOL_DATE ||
>       symbol > SYMBOL_T)
>     return G_TOKEN_SYMBOL;
> 
> ...
Hmm, I've done that but my program dosn't reach this point.  It returns
with error code for before that stuff.

I tried

  /* expect a float (ints are converted to floats on the fly) *or* a string */
  g_scanner_get_next_token (scanner);
  if (scanner->token != G_TOKEN_FLOAT || scanner->token != G_TOKEN_STRING )
    return G_TOKEN_FLOAT;

read floats *AND* strings but failed and I get

test text:1: error: unexpected string constant "J02161999", expected number (float)

If I set "Datum: J02161999\n" (the '-' int the former string caused trouble)
or

test text:1: error: scanner: digit is beyond radix

if I leave "Datum: 02161999\n" ... a string of spaces only.  I expect
that I have to configure the scanner to read strings (like a date or
a name), but I can't find any way how to do that.

Kind regards

   Andreas.