Re: Do people create parsers for command line arguments?

Giacinto Cifelli <gciofono@gmail.com>
Mon, 8 Aug 2022 18:25:18 +0200

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Related articles
Do people create parsers for command line arguments? costello@mitre.org (Roger L Costello) (2022-07-28)
Re: Do people create parsers for command line arguments? 480-992-1380@kylheku.com (Kaz Kylheku) (2022-07-29)
Re: Do people create parsers for command line arguments? gah4@u.washington.edu (gah4) (2022-07-29)
Re: Do people create parsers for command line arguments? gciofono@gmail.com (Giacinto Cifelli) (2022-08-08)
Re: Do people create parsers for command line arguments? gah4@u.washington.edu (gah4) (2022-08-08)
Re: Do people create parsers for command line arguments? gah4@u.washington.edu (gah4) (2022-08-23)
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From: Giacinto Cifelli <gciofono@gmail.com>
Newsgroups: comp.compilers
Date: Mon, 8 Aug 2022 18:25:18 +0200
Organization: Compilers Central
References: 22-07-054 22-07-057 22-07-059
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="27550"; mail-complaints-to="abuse@iecc.com"
Keywords: parse
Posted-Date: 08 Aug 2022 23:17:23 EDT
In-Reply-To: 22-07-059

in general the linux command line arguments are parsed through getopt(3)
https://www.man7.org/linux/man-pages/man3/getopt.3.html


and it is better not to implement special things on the command line,
because it could be pre-parsed or expanded by the shell itself.


then if you want to pass a string on the command line, that is
different, but then again, it is better to take it from stdin.


On Sat, Jul 30, 2022 at 1:00 AM gah4 <gah4@u.washington.edu> wrote:
>
> On Friday, July 29, 2022 at 2:49:38 PM UTC-7, Kaz Kylheku wrote:
>
> (snip)
>
> > All of these programs must be parsing. They have phrase structures
> > and operator precedence with parentheses right the command line.
>
> It seems to me that this is the important part. The simplest processing
> of a command line might not count as parsing.
>
> If one processes an arithmetic expression left to right, with no precedence,
> that might not count as parsing. Is two different precedence levels enough?
>
> My first thought of the question was for machine generated vs.
> hand written parsers. When does it get complicated enough to make
> it worth using a parser generator?



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