mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
55 lines
2.2 KiB
Plaintext
55 lines
2.2 KiB
Plaintext
|
Path: cwi.nl!sun4nl!mcsun!uunet!cs.utexas.edu!convex!usenet
|
||
|
|
From: tchrist@convex.COM (Tom Christiansen)
|
||
|
|
Newsgroups: comp.lang.perl
|
||
|
|
Subject: Re: The problems of Perl (Re: Question (silly?))
|
||
|
|
Message-ID: <1992Jan17.053115.4220@convex.com>
|
||
|
|
Date: 17 Jan 92 05:31:15 GMT
|
||
|
|
References: <17458@ector.cs.purdue.edu> <1992Jan16.165347.25583@cherokee.uswest.com> <=#Hues+4@cs.psu.edu>
|
||
|
|
Sender: usenet@convex.com (news access account)
|
||
|
|
Reply-To: tchrist@convex.COM (Tom Christiansen)
|
||
|
|
Organization: CONVEX Realtime Development, Colorado Springs, CO
|
||
|
|
Lines: 83
|
||
|
|
Nntp-Posting-Host: pixel.convex.com
|
||
|
|
|
||
|
|
From the keyboard of flee@cs.psu.edu (Felix Lee):
|
||
|
|
:And Perl is definitely awkward with data types. I haven't yet found a
|
||
|
|
:pleasant way of shoving non-trivial data types into Perl's grammar.
|
||
|
|
|
||
|
|
Yes, it's pretty aweful at that, alright. Sometimes I write perl programs
|
||
|
|
that need them, and sometimes it just takes a little creativity. But
|
||
|
|
sometimes it's not worth it. I actually wrote a C program the other day
|
||
|
|
(gasp) because I didn't want to deal with a game matrix with six links per node.
|
||
|
|
|
||
|
|
:Here's a very simple problem that's tricky to express in Perl: process
|
||
|
|
:the output of "du" to produce output that's indented to reflect the
|
||
|
|
:tree structure, and with each subtree sorted by size. Something like:
|
||
|
|
: 434 /etc
|
||
|
|
: | 344 .
|
||
|
|
: | 50 install
|
||
|
|
: | 35 uucp
|
||
|
|
: | 3 nserve
|
||
|
|
: | | 2 .
|
||
|
|
: | | 1 auth.info
|
||
|
|
: | 1 sm
|
||
|
|
: | 1 sm.bak
|
||
|
|
|
||
|
|
At first I thought I could just keep one local list around
|
||
|
|
at once, but this seems inherently recursive. Which means
|
||
|
|
I need an real recursive data structure. Maybe you could
|
||
|
|
do it with one of the %assoc arrays Larry uses in the begat
|
||
|
|
programs, but I broke down and got dirty. I think the hardest
|
||
|
|
part was matching Felix's desired output exactly. It's not
|
||
|
|
blazingly fast: I should probably inline the &childof routine,
|
||
|
|
but it *was* faster to write than I could have written the
|
||
|
|
equivalent C program.
|
||
|
|
|
||
|
|
|
||
|
|
--tom
|
||
|
|
|
||
|
|
--
|
||
|
|
"GUIs normally make it simple to accomplish simple actions and impossible
|
||
|
|
to accomplish complex actions." --Doug Gwyn (22/Jun/91 in comp.unix.wizards)
|
||
|
|
|
||
|
|
Tom Christiansen tchrist@convex.com convex!tchrist
|
||
|
|
|