[32300] in Perl-Users-Digest
Perl-Users Digest, Issue: 3567 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Wed Dec 14 11:09:35 2011
Date: Wed, 14 Dec 2011 08:09:13 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Wed, 14 Dec 2011 Volume: 11 Number: 3567
Today's topics:
Difference between my() and $var = false <jwcarlton@gmail.com>
Re: Difference between my() and $var = false <jwcarlton@gmail.com>
Re: Difference between my() and $var = false <mvdwege@mail.com>
Re: Difference between my() and $var = false <tadmc@seesig.invalid>
Re: Difference between my() and $var = false <tadmc@seesig.invalid>
Re: Difference between my() and $var = false <jurgenex@hotmail.com>
Re: Difference between my() and $var = false <ben@morrow.me.uk>
Joyhong Software wishes you a good day! <manniking50@gmail.com>
Re: Problem configuring OS/2 for installing CPAN packag <ben@morrow.me.uk>
Re: Problem configuring OS/2 for installing CPAN packag <ben@morrow.me.uk>
Question on using perl in a cgi script <mittra@juno.com>
Re: Question on using perl in a cgi script <mvdwege@mail.com>
Re: Question on using perl in a cgi script <hjp-usenet2@hjp.at>
Re: Question on using perl in a cgi script <mvdwege@mail.com>
Re: Question on using perl in a cgi script <ben@morrow.me.uk>
Re: simple xml - change tag name <hjp-usenet2@hjp.at>
Re: simple xml - change tag name <hjp-usenet2@hjp.at>
vi regex to preserve interior commas in CSV string <cartercc@gmail.com>
Re: vi regex to preserve interior commas in CSV string <tadmc@seesig.invalid>
Re: vi regex to preserve interior commas in CSV string <cartercc@gmail.com>
Re: vi regex to preserve interior commas in CSV string <tadmc@seesig.invalid>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Tue, 13 Dec 2011 20:52:27 -0800 (PST)
From: Jason C <jwcarlton@gmail.com>
Subject: Difference between my() and $var = false
Message-Id: <14246564.251.1323838347052.JavaMail.geo-discussion-forums@yqjp15>
Is there a technical difference between these two?
my($var);
$var = false;
------------------------------
Date: Tue, 13 Dec 2011 23:01:42 -0800 (PST)
From: Jason C <jwcarlton@gmail.com>
Subject: Re: Difference between my() and $var = false
Message-Id: <31206867.318.1323846102816.JavaMail.geo-discussion-forums@yqcs5>
On Tuesday, December 13, 2011 11:52:27 PM UTC-5, Jason C wrote:
> Is there a technical difference between these two?
>
> my($var);
> $var = false;
Or, well, I guess I should say $var = undef, not $var = false. Sorry, I haven't really programmed in Perl in awhile.
------------------------------
Date: Wed, 14 Dec 2011 08:32:13 +0100
From: Mart van de Wege <mvdwege@mail.com>
Subject: Re: Difference between my() and $var = false
Message-Id: <86ehw7k3r6.fsf@gaheris.avalon.lan>
Jason C <jwcarlton@gmail.com> writes:
> Is there a technical difference between these two?
>
> my($var);
> $var = false;
The first declares a lexically scoped variable.
The second declares a global variable (and will die on 'use strict').
Mart
--
"We will need a longer wall when the revolution comes."
--- AJS, quoting an uncertain source.
------------------------------
Date: Wed, 14 Dec 2011 05:09:30 -0600
From: Tad McClellan <tadmc@seesig.invalid>
Subject: Re: Difference between my() and $var = false
Message-Id: <slrnjeh16i.od.tadmc@tadbox.sbcglobal.net>
Jason C <jwcarlton@gmail.com> wrote:
> Is there a technical difference between these two?
>
> my($var);
> $var = false;
Yes.
and you should put quotes around strings.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.liamg\100cm.j.dat/"
The above message is a Usenet post.
I don't recall having given anyone permission to use it on a Web site.
------------------------------
Date: Wed, 14 Dec 2011 05:11:05 -0600
From: Tad McClellan <tadmc@seesig.invalid>
Subject: Re: Difference between my() and $var = false
Message-Id: <slrnjeh19i.od.tadmc@tadbox.sbcglobal.net>
Jason C <jwcarlton@gmail.com> wrote:
> Is there a technical difference between these two?
>
> my($var);
> $var = false;
Yes, they are different types of variables.
See:
"Coping with Scoping":
http://perl.plover.com/FAQs/Namespaces.html
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.liamg\100cm.j.dat/"
The above message is a Usenet post.
I don't recall having given anyone permission to use it on a Web site.
------------------------------
Date: Wed, 14 Dec 2011 04:25:23 -0800
From: Jürgen Exner <jurgenex@hotmail.com>
Subject: Re: Difference between my() and $var = false
Message-Id: <fc5he7l78de52lolof2ovpr5jtnbh7ih4l@4ax.com>
Jason C <jwcarlton@gmail.com> wrote:
>Is there a technical difference between these two?
>
>my($var);
>$var = false;
Hmmmm, do they have anything in common?
jue
------------------------------
Date: Wed, 14 Dec 2011 13:44:42 +0000
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: Difference between my() and $var = false
Message-Id: <arlmr8-kki.ln1@anubis.morrow.me.uk>
Quoth Jürgen Exner <jurgenex@hotmail.com>:
> Jason C <jwcarlton@gmail.com> wrote:
> >Is there a technical difference between these two?
> >
> >my($var);
> >$var = false;
>
> Hmmmm, do they have anything in common?
$var? ;?
They're both valid Perl statements? (Given a suitable definition of
false(), of course.)
Ben
------------------------------
Date: Tue, 13 Dec 2011 23:38:27 -0800 (PST)
From: Manni King <manniking50@gmail.com>
Subject: Joyhong Software wishes you a good day!
Message-Id: <f9a6f50c-6336-46b1-ba32-4e8b60e3e2a3@s10g2000prs.googlegroups.com>
I would just like to follow up with you regarding your interest in our
Fax Solution - Joyfax Server. My colleague Nicole had replied your
email a few days ago, but didn't hear from you. Did you have any other
questions or concerns? If so, please don't hesitate to contact me. I
hope to hear back from you soon.
Best Regards,
John
------------------------------
Date: Wed, 14 Dec 2011 02:28:04 +0000
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: Problem configuring OS/2 for installing CPAN packages
Message-Id: <k6elr8-635.ln1@anubis.morrow.me.uk>
Quoth Shmuel (Seymour J.) Metz <spamtrap@library.lspace.org.invalid>:
> In <w6qdndLjipZ4EUrTnZ2dnUVZ7q6dnZ2d@bt.com>, on 12/01/2011
> at 08:19 AM, Ben Morrow <ben@morrow.me.uk> said:
>
> >OK. If you go to http://deps.cpantesters.org it will give you a
> >tree-ordered list of a module's dependencies.
>
> I tried it for DNS and it couldn't find it. Is the site only for core
> modules?
No. You do need the full module name, though, with the correct
capitalisation, e.g.
http://deps.cpantesters.org/?module=Net%3A%3ADNS&perl=5.10.0&os=any+OS
For your purposes the 'OS' box is irrelevant (that just controls which
set of test results are used to calculate the 'chance of passing' field,
but there probably won't be any OS/2 results in any case); but the
'Perl' box should be set to 5.10.0 since that is used to determine which
modules you have in your perl core.
Ben
------------------------------
Date: Wed, 14 Dec 2011 14:21:55 +0000
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: Problem configuring OS/2 for installing CPAN packages
Message-Id: <31omr8-ocr.ln1@anubis.morrow.me.uk>
Quoth Shmuel (Seymour J.) Metz <spamtrap@library.lspace.org.invalid>:
> In <4ee4c6a1$6$fuzhry+tra$mr2ice@news.patriot.net>, on 12/11/2011
> at 10:05 AM, Shmuel (Seymour J.) Metz
> <spamtrap@library.lspace.org.invalid> said:
>
> >It looks like I ran into another directory mapping issue.
>
> If I reinstate the SET PERLLIB_PREFIX=/PERL5/LIB;Q:/PROGRAMS/PERL/LIB
> then I get farther:
Have you lost the mapping /perl5 -> q:\programs\perl in the kLibc
settings? I suspect if paths must be remapped it's better to do that
inside kLibc than in perl. For one thing, with that environment setting
I believe you'll end up back where you started with 'your perl and your
Config seem to have different ideas...'.
> [h:\vendors\cpan\io-1.25]U:\extras\bin\make test
> Q:/PROGRAMS/PERL/bin/perl.exe "-MExtUtils::Command::MM" "-e"
> "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
> t/IO...............ok
> t/io_const.........ok
> t/io_dir...........ok
> t/io_dup...........ok
> t/io_file..........ok
> t/io_linenum.......ok
> t/io_multihomed....ok
> t/io_pipe..........ok
> t/io_poll..........FAILED test 3
> Failed 1/10 tests, 90.00% okay
This doesn't worry me much. The test is testing that poll(2) works on
STDOUT, which is a pipe, and it's already skipped on Win32, NetWare, VMS
and BeOS because those OSs have a poll(2) which only works on sockets. I
suspect the same is true of OS/2, and it simply needs to be added to the
list of OSs to skip.
> t/io_sel...........ok 1/23Use of uninitialized value within @a in
> array dereference at t/io_sel.t line 71.
> t/io_sel...........NOK 11/23Can't use an undefined value as a symbol
> reference at t/io_sel.t line 72.
> t/io_sel...........dubious
> Test returned status 22 (wstat 5632, 0x1600)
> DIED. FAILED tests 11-23
> Failed 13/23 tests, 43.48% okay
This is basically the same (it's testing that select(2) can detect
writability on a pipe), but because the test is written slightly
stupidly if it fails the whole script breaks. Again, I suspect this is
an expected failure (a deficiency in OS/2's select(2) rather than in
perl), so if you add 'os2' to the qw() list on line 52 like this
if ( grep $^O eq $_, qw(MSWin32 NetWare dos VMS riscos beos os2) ) {
the rest of the tests should pass.
If you feel like confirming I am correct here (from the OS/2 and/or
kLibc documentation) and filing a bug (send mail to bug-IO@rt.cpan.org),
that would be a Good Thing, but otherwise I think you can just ignore
these failures.
Ben
------------------------------
Date: Tue, 13 Dec 2011 23:37:28 -0800 (PST)
From: q-rious <mittra@juno.com>
Subject: Question on using perl in a cgi script
Message-Id: <23235012.323.1323848248818.JavaMail.geo-discussion-forums@yqnd19>
This is a question about using perl in cgi. If this is not the proper perl forum, my apologies.
I want to build a cgi script using perl that will continously loop through the following:
a) read from a line from a one line file
b) draw something on the screen based on that value (using gd)
I can do this for one iteration of the loop. But how do I update the browser screen for multiple iterations? For other restrictions, I can not reload the entire page each time the script goes through the loop. I can only update the drawing (Step b).
Thanks in advance for your help.
------------------------------
Date: Wed, 14 Dec 2011 08:41:31 +0100
From: Mart van de Wege <mvdwege@mail.com>
Subject: Re: Question on using perl in a cgi script
Message-Id: <867h1zk3bo.fsf@gaheris.avalon.lan>
q-rious <mittra@juno.com> writes:
> This is a question about using perl in cgi. If this is not the proper
> perl forum, my apologies.
>
> I want to build a cgi script using perl that will continously loop
> through the following:
>
> a) read from a line from a one line file b) draw something on the
> screen based on that value (using gd)
>
> I can do this for one iteration of the loop. But how do I update the
> browser screen for multiple iterations? For other restrictions, I can
> not reload the entire page each time the script goes through the
> loop. I can only update the drawing (Step b).
>
You can't do that with static HTML and CGI, period.
The only way to do this is using some sort of client side code to
repeatedly GET the CGI script and use the output to update the page.
The obvious candidate is JavaScript.
Mart
--
"We will need a longer wall when the revolution comes."
--- AJS, quoting an uncertain source.
------------------------------
Date: Wed, 14 Dec 2011 10:06:12 +0100
From: "Peter J. Holzer" <hjp-usenet2@hjp.at>
Subject: Re: Question on using perl in a cgi script
Message-Id: <slrnjegpo4.tgf.hjp-usenet2@hrunkner.hjp.at>
On 2011-12-14 07:41, Mart van de Wege <mvdwege@mail.com> wrote:
> q-rious <mittra@juno.com> writes:
>> This is a question about using perl in cgi. If this is not the proper
>> perl forum, my apologies.
>>
>> I want to build a cgi script using perl that will continously loop
>> through the following:
>>
>> a) read from a line from a one line file b) draw something on the
>> screen based on that value (using gd)
>>
>> I can do this for one iteration of the loop. But how do I update the
>> browser screen for multiple iterations? For other restrictions, I can
>> not reload the entire page each time the script goes through the
>> loop. I can only update the drawing (Step b).
>>
> You can't do that with static HTML and CGI, period.
Yes, you can. Just include a Refresh header in the HTTP response.
That works at least for whole HTML pages. I'm not sure whether it works
for inline images. If it doesn't, you can still load the image into an
iframe.
> The only way to do this is using some sort of client side code to
> repeatedly GET the CGI script and use the output to update the page.
That client side code is called a "browser" ;-).
> The obvious candidate is JavaScript.
That works, too (and it is more flexible than the refresh header).
hp
--
_ | Peter J. Holzer | Deprecating human carelessness and
|_|_) | Sysadmin WSR | ignorance has no successful track record.
| | | hjp@hjp.at |
__/ | http://www.hjp.at/ | -- Bill Code on asrg@irtf.org
------------------------------
Date: Wed, 14 Dec 2011 10:27:47 +0100
From: Mart van de Wege <mvdwege@mail.com>
Subject: Re: Question on using perl in a cgi script
Message-Id: <8639cnjyek.fsf@gaheris.avalon.lan>
"Peter J. Holzer" <hjp-usenet2@hjp.at> writes:
> On 2011-12-14 07:41, Mart van de Wege <mvdwege@mail.com> wrote:
>> q-rious <mittra@juno.com> writes:
>>> This is a question about using perl in cgi. If this is not the proper
>>> perl forum, my apologies.
>>>
>>> I want to build a cgi script using perl that will continously loop
>>> through the following:
>>>
>>> a) read from a line from a one line file b) draw something on the
>>> screen based on that value (using gd)
>>>
>>> I can do this for one iteration of the loop. But how do I update the
>>> browser screen for multiple iterations? For other restrictions, I can
>>> not reload the entire page each time the script goes through the
>>> loop. I can only update the drawing (Step b).
>>>
>> You can't do that with static HTML and CGI, period.
>
> Yes, you can. Just include a Refresh header in the HTTP response.
>
Nope.
Note that OP specifies that he can't reload the entire page.
Mart
--
"We will need a longer wall when the revolution comes."
--- AJS, quoting an uncertain source.
------------------------------
Date: Wed, 14 Dec 2011 11:38:00 +0000
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: Question on using perl in a cgi script
Message-Id: <odemr8-bah.ln1@anubis.morrow.me.uk>
Quoth comp.lang.perl.misc@googlegroups.com:
>
> This is a question about using perl in cgi. If this is not the proper
> perl forum, my apologies.
>
> I want to build a cgi script using perl that will continously loop
> through the following:
>
> a) read from a line from a one line file
> b) draw something on the screen based on that value (using gd)
>
> I can do this for one iteration of the loop. But how do I update the
> browser screen for multiple iterations? For other restrictions, I can
> not reload the entire page each time the script goes through the loop. I
> can only update the drawing (Step b).
One thing that hasn't been suggested yet is generating an animated gif.
If you can read the entire file and pre-generate all the images you can
make a gif with a suitably long interval between frames, and send that.
In fact, if you send an animgif a frame at a time (using, e.g.,
GD::Image->gifanimadd), then at least Firefox will display each frame as
it comes in (you will need to test this in all the browsers you care
about, as usual). You can set a very short inter-frame delay, and then
delay sending the next frame until you're ready, at which point it will
be displayed immediately. You need to find a way to get your web server
to hold the connection open and do unbuffered streaming for this, of
course, otherwise the browser won't see the early frames until it's too
late.
Ben
------------------------------
Date: Tue, 13 Dec 2011 20:56:00 +0100
From: "Peter J. Holzer" <hjp-usenet2@hjp.at>
Subject: Re: simple xml - change tag name
Message-Id: <slrnjefbeg.lq3.hjp-usenet2@hrunkner.hjp.at>
On 2011-12-06 14:42, Ben Morrow <ben@morrow.me.uk> wrote:
> Quoth Henry Law <news@lawshouse.org>:
>> On 06/12/11 11:24, Krzysztof Poc wrote:
>>
>> > Thanks for help. It works. Unfortunately the output XML does not
>> > resemble the
>> > input XML. The format differs a lot. I used "AttrIndent => 1" and it
>> > still differs a
>> > lot. Can I force Simple::XML to produce exactly the same text format
>> > for output
[...]
> In practice, many applications of XML don't care about whitespace, and
> XML::Simple was written for them.
Even worse, XML::Simple doesn't preserve order. For example, parsing
<html>
<body>
<h1> Headline </h1>
<h2> Section 1 </h2>
<p> A paragraph. </p>
<p> Another one. </p>
<h2> Section 2 </h2>
<p> Paragraph in section 2. </p>
</body>
</html>
produces:
{
'body' => {
'h1' => ' Headline ',
'p' => [
' A paragraph. ',
' Another one. ',
' Paragraph in section 2. '
],
'h2' => [
' Section 1 ',
' Section 2 '
]
}
};
hp
--
_ | Peter J. Holzer | Deprecating human carelessness and
|_|_) | Sysadmin WSR | ignorance has no successful track record.
| | | hjp@hjp.at |
__/ | http://www.hjp.at/ | -- Bill Code on asrg@irtf.org
------------------------------
Date: Tue, 13 Dec 2011 20:58:54 +0100
From: "Peter J. Holzer" <hjp-usenet2@hjp.at>
Subject: Re: simple xml - change tag name
Message-Id: <slrnjefbju.lq3.hjp-usenet2@hrunkner.hjp.at>
On 2011-12-09 12:10, RedGrittyBrick <RedGrittyBrick@spamweary.invalid> wrote:
> †I don't really understand what is the benefit of preserving white-space
> in elements that are *not* leaf elements. But that's the way XML is.
>
<span><big>A</big>void</span> is not the same as
<span><big>A</big> void</span> (and shouldn't be).
hp
--
_ | Peter J. Holzer | Deprecating human carelessness and
|_|_) | Sysadmin WSR | ignorance has no successful track record.
| | | hjp@hjp.at |
__/ | http://www.hjp.at/ | -- Bill Code on asrg@irtf.org
------------------------------
Date: Tue, 13 Dec 2011 07:59:01 -0800 (PST)
From: ccc31807 <cartercc@gmail.com>
Subject: vi regex to preserve interior commas in CSV string
Message-Id: <2530e386-7e40-4c4a-8e6b-c008df92d4ce@32g2000yqp.googlegroups.com>
I have CSV file with rows that looks like this:
ROW EXAMPLE 1
fieldA,fieldB,fieldC,George,Washington,President,"1600 Pennsylvania
Avenue, Washington, D.C. 55554",202-555-1212,fieldX,fieldY,fieldZ<EOL>
I want to preserve the interior commas from the double quoted portion
of the string, perhaps turning it into something like this:
ROW EXAMPLE 2
'fieldA','fieldB','fieldC','George','Washington,President','1600
Pennsylvania Avenue, Washington, D.C.
55554','202-555-1212,','fieldX',;fieldY',;fieldZ'<EOL>
where each value is single quoted and the values are separated by
commas.
I wanted (past tense) to do this with one vi (vim) regex and spend
about an hour trying different ones before giving up in failure. I use
three different regexes to do what I wanted, so I don't have the
problem anymore, but I still have the question.
What one regex can I use (in vi/vim) to transform EXAMPLE 1 to EXAMPLE
2?
Thanks, CC.
------------------------------
Date: Tue, 13 Dec 2011 12:18:43 -0600
From: Tad McClellan <tadmc@seesig.invalid>
Subject: Re: vi regex to preserve interior commas in CSV string
Message-Id: <slrnjef5v6.tun.tadmc@tadbox.sbcglobal.net>
["Followup-To:" header set to comp.lang.perl.misc.]
ccc31807 <cartercc@gmail.com> wrote:
> ROW EXAMPLE 1
> fieldA,fieldB,fieldC,George,Washington,President,"1600 Pennsylvania
^
^
> ROW EXAMPLE 2
> 'fieldA','fieldB','fieldC','George','Washington,President','1600
How do you determine that the comma in "Washington,President"
is not a field separator?
Are you missing some double quotes in your ROW EXAMPLE 1 ?
Or are you missing some single quotes in your ROW EXAMPLE 2 ?
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.liamg\100cm.j.dat/"
The above message is a Usenet post.
I don't recall having given anyone permission to use it on a Web site.
------------------------------
Date: Tue, 13 Dec 2011 11:38:32 -0800 (PST)
From: ccc31807 <cartercc@gmail.com>
Subject: Re: vi regex to preserve interior commas in CSV string
Message-Id: <299e4f20-3c80-4ce5-8faa-21db5988547f@r6g2000yqr.googlegroups.com>
On Dec 13, 1:18=A0pm, Tad McClellan <ta...@seesig.invalid> wrote:','1600
>
> How do you determine that the comma in "Washington,President"
> is not a field separator?
>
> Are you missing some double quotes in your ROW EXAMPLE 1 ?
>
> Or are you missing some single quotes in your ROW EXAMPLE 2 ?
The file is an Excel file saved as a DOS-CSV file. Excel qualifies
text fields with double quotes if and only if the text field contains
a comma.
Obviously, you can write a Perl script to munge the data file, either
by using one of the CSV modules or by hand rolling your own. However,
this was such a simple task that I didn't want to go to the trouble of
writing such a script.
My solution was to (1) substitute every comma between double quotes to
an asterisk, (2) substitute every comma to an apostrophe, comma,
apostrophe, and (3) substitute every asterisk back to a comma.
vi/vim should be able to do this with one regex rather than three.
CC.
------------------------------
Date: Tue, 13 Dec 2011 16:32:08 -0600
From: Tad McClellan <tadmc@seesig.invalid>
Subject: Re: vi regex to preserve interior commas in CSV string
Message-Id: <slrnjefkqd.ui2.tadmc@tadbox.sbcglobal.net>
["Followup-To:" header set to comp.lang.perl.misc.]
ccc31807 <cartercc@gmail.com> wrote:
> On Dec 13, 1:18Â pm, Tad McClellan <ta...@seesig.invalid> wrote:','1600
>>
>> How do you determine that the comma in "Washington,President"
>> is not a field separator?
>>
>> Are you missing some double quotes in your ROW EXAMPLE 1 ?
>>
>> Or are you missing some single quotes in your ROW EXAMPLE 2 ?
>
> The file is an Excel file saved as a DOS-CSV file. Excel qualifies
> text fields with double quotes if and only if the text field contains
> a comma.
So then, you are missing some single quotes in your ROW EXAMPLE 2.
ie. you should have two fields
'Washington','President'
rather than the single field
'Washington,President'
that you had in your original post.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.liamg\100cm.j.dat/"
The above message is a Usenet post.
I don't recall having given anyone permission to use it on a Web site.
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
Administrivia:
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------------------------------
End of Perl-Users Digest V11 Issue 3567
***************************************
