To top this thread off, I went with this:
/* DATA statements convert everything to a string */
{
[^,:\n]* {
// eat any leading and trailing whitespace
yytext = str_trim(yytext);
// and quotes
yytext = str_unquote(yytext);
> On 3 Dec 2024, at 21:24, James K. Lowden wrote:
>
> On Tue, 3 Dec 2024 17:57:13 +0100
> Hans Åberg wrote:
>
>> In general, one tries to exploit tokens to do special things, which
>> is also useful in a Bison parser when adding mid-rule actions.
>
> That's good advice, hard-won.
>
>>> i
On Tue, 3 Dec 2024 17:57:13 +0100
Hans Åberg wrote:
> In general, one tries to exploit tokens to do special things, which
> is also useful in a Bison parser when adding mid-rule actions.
That's good advice, hard-won.
> > it seems it is much easier to parse everything in the data section
> >
> On 3 Dec 2024, at 17:44, Maury Markowitz wrote:
>
>> On Dec 1, 2024, at 2:07 PM, James K. Lowden wrote:
>>
>> require some real thinking, never easy. For example, is
>>
>> 10100 DATA "one",2B,"three"
>>
>> valid? If it is, you'll need one pattern for "leading alpha" that might
>> be jus
> On Dec 1, 2024, at 2:07 PM, James K. Lowden wrote:
>
> require some real thinking, never easy. For example, is
>
> 10100 DATA "one",2B,"three"
>
> valid? If it is, you'll need one pattern for "leading alpha" that might
> be just one character, and another for "leading digit" that requ
> On 2 Dec 2024, at 03:10, Maury Markowitz wrote:
>
> I had managed to get to this point for testing the conditional states:
>
> [^0-9][A-Za-z]*[,:\n] {
> yytext[strlen(yytext) - 1] = '\0';
> yylval.s = str_new(yytext + 1);
> return STRING;
> }
Notice tha
> On 1 Dec 2024, at 20:07, James K. Lowden wrote:
>
> On Sun, 1 Dec 2024 21:10:31 -0500
> Maury Markowitz wrote:
>
>>> DATA { yy_push_state(data); }
>>
>> Is there a difference between yy_push_state(data) and BEGIN(data)?
>
> Yes. As stated in the manual, BEGIN simply changes the start
> c
On Sun, 1 Dec 2024 21:10:31 -0500
Maury Markowitz wrote:
> > DATA { yy_push_state(data); }
>
> Is there a difference between yy_push_state(data) and BEGIN(data)?
Yes. As stated in the manual, BEGIN simply changes the start
condition. yy_push_state and yy_pop_state use a stack, so you can
retur
> On Nov 30, 2024, at 8:42 PM, James K. Lowden wrote:
> I'm just a bit skeptical. If the rule is that
>
>> DATA 10,20,"HELLO,WORLD!"
> and
>> DATA 10,20,HELLO,WORLD!
> Or is it the case that the quoted equivalent would be
>
>> DATA 10,20,"HELLO","WORLD!"
This. It's basically CSV, and given
On Sun, 1 Dec 2024 10:07:45 -0500
Maury Markowitz wrote:
> DATA 10,20,HELLO,WORLD!
>
> I am looking for ways to attack this.
To add to what Hans said, you want to extend what the scanner accepts
in a DATA statement. In your case, DATA has a slightly more expansive
view of what an expression is
> On 1 Dec 2024, at 19:08, Maury Markowitz wrote:
>
>> This will probably require you to take into account the current context; see
>> Hans's reply.
>
> Yeah, I am completely new to that side of things. I'm in the bison dox now
> and I can't say I'm understanding much yet.
Check the Flex ma
> On Dec 1, 2024, at 12:31 PM, EML wrote:
>
> This matches, among other things, a string which starts with a double quote,
> terminated by a newline, with no closing quote. Not even Basic can be that
> bad.
Sorry to be the bearer of bad news, but BASIC is precisely that bad. Since many
PRINTs
Basic... wow. Start by fixing your regexes:
[0-9]*[0-9.][0-9]*([Ee][-+]?[0-9]+)? {
yylval.d = strtod(yytext, NULL);
return NUMBER;
}
This matches a single '.', '.E0', and so on. Presumably you want
something which looks more like
dec_digit [0-9]
suffix
> On 1 Dec 2024, at 16:07, Maury Markowitz wrote:
>
> But many dialects allow strings to be unquoted as long as they do not contain
> a line end, colon or comma:
>
> DATA 10,20,HELLO,WORLD!
One way is to use context switches; see the Flex and Bison manuals.
In the .l file one has say:
%x D
I seem to have programmed myself into a corner, and I'm hoping someone can
offer some suggestions.
Source code here: https://github.com/maurymarkowitz/RetroBASIC/tree/master/src
The BASIC language has two constant types, numbers and strings. The ~300 line
scanner is basically a list of the keyw
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