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Difference between these regexes
5 direct replies — Read more / Contribute
by haukex
on Jul 29, 2016 at 08:36

    Fellow Monks,

    I seek your wisdom: A recent node (Re: No tools? Use Perl?!) got me wondering: Is there a difference between these three regexes that I am missing, primarily in terms of what they match? In particular I'm interested in the first two - I understand the first and third regexes, but am not an expert on look-arounds.

    1. /<(.*?)>/s
    2. /<((?:(?!>).)*)>/s
    3. /<([^>]*)>/s

    I have yet to find a difference - I am not sure if there even is one - but I'm probably not being creative enough in my test cases...

    -- Hauke D

Crypt() usage
3 direct replies — Read more / Contribute
by fionbarr
on Jul 28, 2016 at 12:04
    Is the 'crypt' function identical on Windows and *nix platforms?
$_[OBJECT] 's example
1 direct reply — Read more / Contribute
by liuweichuan
on Jul 27, 2016 at 23:30
    I have do some example about POE; but about this point on $_OBJECT parameter, i can't know clear. i make a, contains a object:
    package baozi; sub new{ my $class = shift; my $self = bless {}, $class; } sub fun1{ my $self = shift; print "fun1......baozi \n" } 1
    then try the $_OBJECT in other pl,
    use POE; use baozi; POE::Session->create( inline_states => { _start => sub { $_[KERNEL]->yield('next1')}, next1 => sub { print "tick ... \n"; $_[KERNEL]->delay(next2 => 1); }, next2 => \&next2, next3 =>\&baozi, }, ); POE::Kernel->run(); sub next2{ print "tick 0 ... \n"; $_[KERNEL]->yield('next3'); } sub baozi{ my $self = $_[OBJECT]; print $self; $self->baozi::fun1(); }
    I think 'next2' call 'next3' handler, and run sub baozi.$self->baozi::fun1(); can call package baozi's fun1. but I know my thinking is wrong, plz tell me more right, and help me understand $_OBJECT, thank you.
Perl Code Changes Behavior if Two Subroutine definitions are swapped
2 direct replies — Read more / Contribute
by rkabhi
on Jul 27, 2016 at 10:04

    Hello Perl Monks !!

    I came across a really unexpected issue while developing a code to read a netlist file containing just few lines. I have written down system details, the code and input file and finally I describe the problem at the end

    System and Setup Info: Linux RHEL6 Perl Version 5.10.1



    #!/usr/bin/perl use strict; use warnings; use Switch; #Common Variable Initialization my %DeviceList = (); my $netlist_file = "/home/abhishek_r/Tool_Development/Voltrace/Perl/ne +tlist.scs"; my @InbuiltDeviceList = ('resistor','capacitor','inductor','vsource',' +isource'); my @subcktslist = getSubcktList($netlist_file); print @subcktslist; TraceSubcktDevices($netlist_file); sub getSubcktList{ my $netlist = $_[0]; my @subckts = (); open(READ_NETLIST, "<$netlist") or die "Couldn't open netlist file + for read, $!"; while(<READ_NETLIST>){ chomp; s/^\s+//; #To remove leading blanks (if any) in the line #ignore line if it contains comments or initializing words for + spectre switch() { case /^[*\/]/i {next;} case /simulator\s+lang/i {next;} case /^include/i {next;} } if(/subckt/i) { my $line = $_; my @words = split(/\s+/,$line); #Split the read line in $_ + with white spaces as delimiter my $nameindex = 1; #Default index where subckt name i +s usally found if(/inline/i){ #To change name index if subckt de +finition includes inline $nameindex = 2; } push @subckts,$words[$nameindex]; } } close(READ_NETLIST); return @subckts; } sub TraceSubcktDevices{ #Input: (netlist_file, subcktname, key +_init) where subcktname is the name of subckt that needs to be traced + in the netlist my $netlist = $_[0]; my $subcktname = "hello"; $subcktname =~ s/^\s*|\s*$//g; #To remove all leading and trainin +g blanks from input subckt name my $key_init = $_[2]; my $skip=0; #Default Skip status for netlist l +ine. 0 indicates "don't skip" and is set for TOPLEVEL if($subcktname){ #Set skip flag if input subckt name is not + blank i.e. the tracing is not required at TOPLEVEL $skip = 1; } open(READ_NETLIST, "<$netlist") or die "Couldn't open netlist file + for read, $!"; while(<READ_NETLIST>){ $skip = $skip + 1; print "Hello"; } close(READ_NETLIST); }

    Input File: netlist.scs

    // Generated for: spectre // Generated on: Jul 26 15:10:24 2016 // Design library name: custom // Design cell name: TOPLEVEL // Design view name: schematic simulator lang=spectre global 0 //--------------------------------// // Library name: custom // Cell name: inv // View name: schematic subckt inv IN OUT VDD VSS M0 (OUT IN VSS VSS) nch l=60n w=200n m=1 nf=1 sd=200n ad=3.5e-14 \ as=3.5e-14 pd=750n ps=750n nrd=0.5 nrs=0.5 sa=175n sb=175n sca +=0 \ scb=0 scc=0 M2 (OUT IN VDD VDD) pch l=60n w=200n m=1 nf=1 sd=200n ad=3.5e-14 \ as=3.5e-14 pd=750n ps=750n nrd=0.5 nrs=0.5 sa=175n sb=175n sca +=0 \ scb=0 scc=0 ends inv // End of subcircuit definition. // Library name: custom // Cell name: BUF_DELAY // View name: schematic subckt BUF_DELAY IN OUT VDD VSS I1 (net11 OUT VDD VSS) inv I0 (IN net11 VDD VSS) inv ends BUF_DELAY // End of subcircuit definition. // Library name: custom // Cell name: INV_DELAY // View name: schematic subckt INV_DELAY IN OUT VDD VSS I2 (net08 OUT VDD VSS) inv I1 (net11 net08 VDD VSS) inv I0 (IN net11 VDD VSS) inv ends INV_DELAY // End of subcircuit definition. // Library name: custom // Cell name: TOPLEVEL // View name: schematic I2 (BUF_IN BUF_OUT VDD VSS) BUF_DELAY I3 (INV_IN INV_OUT VDD VSS) INV_DELAY I4 (INV_IN net8) isource type=pwl wave=[ 1u 1 2u 2 ] V3 (VSS 0) vsource dc=0 type=dc V2 (INV_IN 0) vsource dc=0 type=dc V1 (BUF_IN 0) vsource dc=5 type=dc V0 (VDD 0) vsource dc=5 type=dc R0 (net8 VSS) rm1w l=10u w=2u mf=1 C0 (net8 0) capacitor c=1p //----------------- Entering Netlist Footer -------------------//

    The Problem: In the code, there are two subroutines getSubcktList() and TraceSubcktDevices(). The former subroutine works fine. The latter subroutine (i.e. TraceSubcktDevices()) is showing a very unexpected behavior. I have listed my observations below:

    1) If the above code is run "as is" making sure that correct path of netlist.scs file is supplied at the beginning, the code gets stuck (I use Linux command line to run the code) with no response

    2) If I swap the subroutines, i.e. define TraceSubcktDevices() first and getSubcktList(), the code works fine printing "Hello" as many times as the number of lines in input file netlist.scs

    Can anyone please let me know why this is unexpected behavior being observed?

    Thanks !!


    update: edited/code tags by stevieb

Error in HTTPS connection with error: No connection could be made because the target machine actively refused it. at C:/Perl/lib/LWP/Protocol/ line 47
2 direct replies — Read more / Contribute
by jliu5
on Jul 26, 2016 at 11:36

    Hi Monks,

    I am trying to create a REST client to do a simple GET service at a https server, but got this error.

    Here is my sample code, please advice.:

    #! /usr/bin/env perl use REST::Client; use MIME::Base64; my $username = 'me'; my $password = 'me!!'; my $headers = {Accept => 'application/xml', Authorization => 'Basic ' +. encode_base64($username . ':' . $password)}; my $client = REST::Client->new(); $client->getUseragent->ssl_opts(verify_hostname => 0); $client->getUseragent->ssl_opts(SSL_verify_mode => SSL_VERIFY_NONE); $client->getUseragent->no_proxy('server_ip_string', 'server_ip_string' +); $client->GET("https://server_ip_string:port/upm-server/nbi/organizatio +n", $headers ); my $response = $client->responseContent(); print $response;
IO::Compress::Gzip file close issues
2 direct replies — Read more / Contribute
by Paul.Unix
on Jul 26, 2016 at 07:08
    I encountered an issue with IO::Compress::Gzip. After a successful gzip I want to unlink the original file but sometimes the unlink fails with a "permission denied" I made a pragmatic work around by adding a delay and try the unlink again. But a good solution would be preferred. The same issue happens with moving the new .gz to another directory. The files are not in use by another process. Running Strawberry Perl 5.22.0 on Windows 2008 and 2012
    use warnings; use strict; use POSIX; use Cwd; use Cwd 'abs_path'; use Time::Local 'timelocal_nocheck'; # used for SCHEDULE option in +the MQX.ini use Net::Domain qw(hostname hostfqdn hostdomain domainname); use File::Basename; use File::Copy; use IO::Compress::Gzip qw(gzip $GzipError) ; use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ; # module used in the state messages use Digest::MD5; # modules used in put mode use threads; use threads::shared; use Thread::Queue; if ( gzip $archfile => "$archfile.gz", AutoClose => 1, BinModeI +n => 1 ) { my $delete_try_counter = mqx_get_setting('ARCHIVEMOVETRY'); while ( -f $archfile and not unlink $archfile and $dele +te_try_counter != 0 ) { $global_EVENTLOG_IN_LQ->enqueue("WARNING, $arch_ha +shref->{'EVENTLOG'},Can not delete $archfile. Error: $! try: $delete_ +try_counter"); $delete_try_counter -= 1; sleep(mqx_get_setting('ARCHIVEMOVEWAIT')); # wait x sec +onds before retrying } $archfile .= ".gz"; # add .gz to the file name } else { # if the gzip failed try to arc +hive the original file $global_EVENTLOG_IN_LQ->enqueue("ERROR, $arch_hashref->{' +EVENTLOG'}, gzip failed on $archfile\n$GzipError"); }
print all files is soo slow! Why?
4 direct replies — Read more / Contribute
by harangzsolt33
on Jul 25, 2016 at 21:30

    I want to write a simple perl program that goes through the current folder recursively and looks at each item, if it's a file, print its contents and moves on to the next one.

    I am a beginner Perl programmer, and I don't know why this is happening, but this perl program stops responding, and then I have to kill it every time.

    I am using TinyPerl 5.8 under Windows 7.

    I am testing this program in a folder that has about 50 text files and no folders. When I launch my perl program, it seems to work perfectly fine, but it doesn't go back to command prompt. It just hangs. The cursor stops blinking, and I have to kill the process.

    If I only read the first 100 bytes of each file, then there's no issue. I am back to command prompt immediately. If I read the first 2000 bytes, then there's a 3-second delay. And I tried reading the entire file and print the content, but then after executing the script, it stopped responding and I had to kill it.

    use strict; use warnings; my $PATH = '.'; my $CONTENT; explore($PATH); sub explore { my $PATH = shift; my $FILE; my $SUB; opendir(my $DIR, $PATH) or return; while (my $SUB = readdir $DIR) { next if $SUB eq '.' or $SUB eq '..'; $SUB = "$PATH/$SUB"; # If it's a folder, explore it. # If it's a file, print it. if (-d $SUB) { explore($SUB); next; } if (-f $SUB) { open($FILE, '<:raw', $SUB) or next; read($FILE, $CONTENT, 2000) or next; close($FILE); print $CONTENT; $CONTENT = ''; # don't need this data anymore } } close $DIR; }
@INC not set for perlbrew
4 direct replies — Read more / Contribute
by Alessandro
on Jul 25, 2016 at 14:07

    Hi monks,

    I am on os x El capitan and have perlbrew installed. However, when I install a perl module I can't get it working, because it seems perl is not looking at the right place.

    Can't locate WWW/ in @INC (you may need to install the WWW::Mechanize module) (@INC contains: /Library/Perl/5.18/darwin-thread-multi-2level /Library/Perl/5.18 /Network/Library/Perl/5.18/darwin-thread-multi-2level /Network/Library/Perl/5.18 /Library/Perl/Updates/5.18.2/darwin-thread-multi-2level /Library/Perl/Updates/5.18.2 /System/Library/Perl/5.18/darwin-thread-multi-2level /System/Library/Perl/5.18 /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level /System/Library/Perl/Extras/5.18 .)


     which perl returns  /opt/local/bin/perl5

    my understanding is that it should return the path to perlbrew install and not the system perl.

    and  perl -v returns  This is perl 5, version 22, subversion 2 (v5.22.2) built for darwin-thread-multi-2level and I indeed used perlbrew to install and switch to perl 5.22.2 but it seems somehow, the "switch" was only partial. What am I missing here?


Recommendations on a module for web crawling
1 direct reply — Read more / Contribute
by edimusrex
on Jul 25, 2016 at 13:59

    I am trying to crawl a web page where the data I am seeking is generated by javascript. I haven't had to deal with this before but I can imagine I am not the only one who has come across this. Is there a specific module that is preferred in this instance? I've tried using Mechanize::Firefox but the page complains about unsupported browser. I'd prefer to do this in perl but will use other languages if need be.

    Thanks for your recommendations

Apache Kafka prior use
No replies — Read more | Post response
by Wiggins
on Jul 23, 2016 at 14:52
    I am looking for advice from someone who has sailed a possibly mythical sea named 'Apache Kafka' in a Perl boat.

    Due to a thinness of published guidance for the Perl interface, I would like to know if a different Producer is needed for each 'different topic'? I have the producer and consumer each on separate threads. But now have to publish to 3 different topics. I know consumers a 1:1 with topics. Are publishers the same?


    I have ventured a small distance from shore and returned where I had hoped. I find that a single Producer can handle multiple ( =2 which is greater than 1) topics.

    It is always better to have seen your target for yourself, rather than depend upon someone else's description.

New Cool Uses for Perl
Perl 6 SDL2 game
No replies — Read more | Post response
by holyghost
on Jul 25, 2016 at 02:04
    I need to have something to make a buffer for C32 byte arrays. This is for the SDL2 texture. I choose an Xpm file, as it faster parsable in perl. Buffer filling and swapping from a png package is less expensive, therefor I started a PNGImageObject. With PERL 6, SDL2::Raw panda package you can make the following perliminary game :
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