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| Related articles |
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| Languages with optional spaces maury.markowitz@gmail.com (Maury Markowitz) (2020-02-19) |
| Re: Languages with optional spaces awanderin@gmail.com (Jerry) (2020-02-20) |
| Re: Languages with optional spaces drikosev@gmail.com (Ev. Drikos) (2020-02-23) |
| Re: Languages with optional spaces maury.markowitz@gmail.com (Maury Markowitz) (2020-02-25) |
| Re: Languages with optional spaces maury.markowitz@gmail.com (Maury Markowitz) (2020-02-25) |
| Re: Languages with optional spaces martin@gkc.org.uk (Martin Ward) (2020-02-25) |
| Re: Languages with optional spaces 493-878-3164@kylheku.com (Kaz Kylheku) (2020-02-26) |
| Re: Languages with optional spaces awanderin@gmail.com (awanderin) (2020-02-26) |
| Re: Languages with optional spaces drikosev@gmail.com (Ev. Drikos) (2020-02-28) |
| [12 later articles] |
| From: | "Ev. Drikos" <drikosev@gmail.com> |
| Newsgroups: | comp.compilers |
| Date: | Sun, 23 Feb 2020 12:33:36 +0200 |
| Organization: | Aioe.org NNTP Server |
| References: | 20-02-015 |
| Injection-Info: | gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="60628"; mail-complaints-to="abuse@iecc.com" |
| Keywords: | lex, comment |
| Posted-Date: | 23 Feb 2020 21:15:38 EST |
| Content-Language: | en-US |
On 19/02/2020 17:35, Maury Markowitz wrote:
> ... Likewise, one might modify the variable name
> pattern, but I'm not sure how one says "everything that doesn't start with one
> of these other 110 patterns".
>
This should be relatively simple with a scanner generator that supports
intersection and negation operators (or difference operators), but IMHO
such a rule would work ie if FORI wasn't a valid variable name. Still I
can't propose to you a specific tool though.
With a tool like flex, I'd try to see if different start states do work:
https://www.cs.virginia.edu/~cr4bd/flex-manual/Start-Conditions.html
Ev. Drikos
[You can try start states but in my experience if the tokenizing rules
are very context sensitive, it's easier to give up and hand-code the
lexer. The lexical syntax of Basic isn't that big. -John]
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