blob: 2a094261b1c1be71bc142b7214922f48cd2e7a9f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
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
|
