what's new in perl 5.14

What's new

in Perl 5.14

perldoc perlhist

5.10.02007−Dec−18

5.10 appeared at its 20th birthday

— Take part in our survey!

¿Are you using Perl >= 5.10?

saywas introduced

¿Are you using

say?

Seriously

The New History Began with

Modern Perl

Modern Perl

ModernPerl

Modern Perl termis often understood

too widely

But it's just NOT these

That's from a book published in 2009

OK, go further:perldoc perlhist

we'll skip all odd (not even) versions (5.11, 5.13) —

they are odd dev

5.12.02010−Apr−12

¿Are you using Perl >= 5.12?

— What is YAPC?

5.14.0RC12011−Apr−20

RC — is arelease candidate

Then was

RC2

And then

RC3

Well, Perl 6's wayis much longer

Perl 5.14is ready already

What's newin Perl 5.14?

perldoc perldelta

perldelta = = 5.14 – 5.12

NoticeAs described in perlpolicy, the release of Perl 5.14.0 marks the official end of support for Perl 5.10. Users of Perl 5.10 or earlier should consider upgrading to a more recent release of Perl.

Frankly speaking, it's not that easy to

update Perl's versionon existing machine

Modules are the most difficult part

Do you know how to reinstall

everything easily?

New

Syntax

1

Security

2

Remember...

register_globals = off

In PHP since version 4.2.0

$_GET["sql"]

Perl is secureby itself

Incompatibilities

3

Deprecations

4

Performance

5

Modulesand pragmas

6

Documentation

7

Diagnostics

8

Utilities

9

Install process

10

Platforms

11

Internals

12

Bug fixes

13

Опечатки

14

We'll only take a look at syntax and

regular expressions changes

Welcome,

Unicode 6.0!

(Well, it's time toWelcome, Perl 6.0!)

Unicode affects both strings and regexes

A bell

(fairy tale)

ASCII-characterBELL (0x7)

In Unicode 6.0BELL — 0x1F514

Panic!

Perl is calmand wise

Perl is calmand wise

. . . probably

In Perl

BELL  =  0x0007

In Perl

BELL  =  0x0007\N{BELL}  =  0x0007

In Perl

BELL  =  0x0007\N{BELL}  =  0x00070x0007  =  ALERT

BELL  =  0x0007\N{BELL}  =  0x00070x0007  =  ALERTALERT  =  "\a"

BELL  =  0x0007\N{BELL}  =  0x00070x0007  =  ALERTALERT  =  "\a"

\N{BEL}  =  0x0007

BELL  =  0x0007\N{BELL}  =  0x00070x0007  =  ALERTALERT  =  "\a"

\N{BEL}  =  0x00070x1F514  —  no name

BELL  =  0x0007\N{BELL}  =  0x00070x0007  =  ALERTALERT  =  "\a"

\N{BEL}  =  0x00070x1F514  —  no name

0x1F514  =                \N{U+1F514}

ALERT  =  "\a"\N{BEL}  =  0x00070x1F514  —  no name

0x1F514  =                \N{U+1F514}

Plans for Perl 5.16

\N{BELL}  =  0x1F514

0x1F514  —  без имени0x1F514  =                \N{U+1F514}

Plans for Perl 5.16

\N{BELL}  =  0x1F514

replace existing \N{BELL}with  \N{ALERT},\N{BEL}  or  "\a"

use  feature  'unicode_strings';

It brings the hope

That everything is in Unicode

How to turn 5.14 on

use v5.14;

use strict; adds itself

behind the scene

vector stringversion string

abbreviated — v-string

5.10.0v5.10.0v5.10

What's new inregular expressions

(?^  .  .  .)

Switch off all the modifiers locally

"ABC"  =~  /abc/i;

True

False

"ABC"  =~  /a(?^:b)c/i;

True

"ABC"  =~  /a(?^i:b)c/i;

Ingenious reason

$  perl5.14.0  -­‐MData::Dumper  -­‐E'my  $x  =  qr/abc/;  say  Dumper($x)'

$VAR1  =  qr/(?^u:abc)/;

No changes after adding new modifiers to Perl

$  perl5.10.0  -­‐MData::Dumper  -­‐E'my  $x  =  qr/abc/;  say  Dumper($x)'

$VAR1  =  qr/(?-­‐xism:abc)/;

Will be changed after adding new modifiers to Perl

New modifiers

/l==

use  locale;

/u==

use  feature  'unicode_strings';

/d~~

no  locale;no  feature  

'unicode_strings';

/d~~

no  locale;no  feature  

'unicode_strings';

bydefault

/a

How many charactersmatch with

/\d/

How many charactersmatch with

/\d/

±420

for  (0x0  ..  0x10FFFF)  {        my  $char  =  chr($_);        say  $char                if  $char  =~  /^\d$/;}

/\d/ matches any symbol

marked DIGIT in Unicode

0, 1, 2, 3, 4, 5, 6, 7, 8, 9,٠ ١, ٢, ٣, ٤, ٥, ٦, ٧, ٨, ٩, ੦,

੧, ੨, ੩, ੪, ੫, ੬, ੭, ੮, ੯, ૦, ૧,

૨, ૩, ૪, ૫, ૬, ૭, ૮, ૯, ௦, ௧, ௨,

௩, ௪, ௫, ௬, ௭, ௮, ௯, ...

\d became a topic of arguments

/d's behaviouris stable,

but contradictory

d

/aWelcome

for  (0x0  ..  0x10FFFF)  {        my  $char  =  chr($_);        say  $char                if  $char  =~  /^\d$/a;}

Only 10 ASCIIcharacters match

$  perl  a1.pl  |  wc  -­‐l10

/a createsASCII versions

of the modifiers\d, \s и \w

And affects both \b and \B

/r

Non-destructive substitution

A substitutionthat do not change

original string

use  v5.14;

my  $version  =  "Perl  5.10";say  $version  =~  s/5\.10/5.14/r;  

Result: Perl  5.14

my $english = "colour";my $american = $english =~ s/our/or/r;

Arrays and hashes

Extra noise chars to be removed

That featureis experimental

use  v5.14;

my  $a  =  [];push  $a,  3,  5,  7;

use  v5.10;

my  $a  =  [];push  @$a,  3,  5,  7;

(Likewise @a[1] in Perl 6)

And more

push/pop  @$arrayref

push/pop  $arrayref

shift/unshift  @$arrayref

shift/unshift  $arrayref

splice  @$arrayref

splice  $arrayref

keys/values  %$hashref

keys/values  $hashref

keys/values  @$arrayref

keys/values  $arrayref

each  %$href  /  @$aref

each  $href  /  $aref

given returns the last

evaluated value

say  mysub(7);

sub  mysub  {        given($_[0])  {              "few"    when  3;              "OK"      when  5;              "many"  when  7;              "?";        }}

(For thosewho omit

return keyword)

git blame

Aaron Crane, Abhijit Menon-Sen, Abigail, Ævar Arnfjörð Bjarmason, Alastair Douglas, Alexander Alekseev, Alexander Hartmaier, Alexandr Ciornii, Alex Davies, Alex Vandiver, Ali Polatel, Allen Smith, Andreas König, Andrew Rodland, Andy Armstrong, Andy Dougherty, Aristotle Pagaltzis, Arkturuz, Arvan, A. Sinan Unur, Ben Morrow, Bo Lindbergh, Boris Ratner, Brad Gilbert, Bram, brian d foy, Brian Phillips, Casey West, Charles Bailey, Chas. Owens, Chip Salzenberg, Chris 'BinGOs' Williams, chromatic, Craig A. Berry, Curtis Jewell, Dagfinn Ilmari Mannsåker, Dan Dascalescu, Dave Rolsky, David Caldwell, David Cantrell, David Golden, David Leadbeater, David Mitchell, David Wheeler, Eric Brine, Father Chrysostomos, Fingle Nark, Florian Ragwitz, Frank Wiegand, Franz Fasching, Gene Sullivan, George Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Grant McLean, gregor herrmann, H.Merijn Brand, Hongwen Qiu, Hugo van der Sanden, Ian Goodacre, James E Keenan, James Mastros, Jan Dubois, Jay Hannah, Jerry D. Hedden, Jesse Vincent, Jim Cromie, Jirka Hruška, John Peacock, Joshua ben Jore, Joshua Pritikin, Karl Williamson, Kevin Ryde, kmx, Lars Dɪᴇᴄᴋᴏᴡ 迪拉斯, Larwan

Berke, Leon Brocard, Leon Timmermans, Lubomir Rintel, Lukas Mai, Maik Hentsche, Marty Pauley, Marvin Humphrey, Matt Johnson, Matt S Trout, Max Maischein, Michael Breen, Michael Fig, Michael G Schwern, Michael Parker, Michael Stevens, Michael Witten, Mike Kelly, Moritz Lenz, Nicholas Clark, Nick Cleaton, Nick Johnston, Nicolas Kaiser, Niko Tyni, Noirin Shirley, Nuno Carvalho, Paul Evans, Paul Green, Paul Johnson, Paul Marquess, Peter J. Holzer, Peter John Acklam, Peter Martini, Philippe Bruhat (BooK), Piotr Fusik, Rafael Garcia-Suarez, Rainer Tammer, Reini Urban, Renee Baecker, Ricardo Signes, Richard Möhn, Richard Soderberg, Rob Hoelz, Robin Barker, Ruslan Zakirov, Salvador Fandiño, Salvador Ortiz Garcia, Shlomi Fish, Sinan Unur, Sisyphus, Slaven Rezic, Steffen Müller, Steve Hay, Steven Schubiger, Steve Peters, Sullivan Beck, Tatsuhiko Miyagawa, Tim Bunce, Todd Rinaldo, Tom Christiansen, Tom Hukins, Tony Cook, Tye McQueen, Vadim Konovalov, Vernon Lyon, Vincent Pit, Walt Mankowski, Wolfram Humann, Yves Orton, Zefram и Zsbán Ambrus.

use v5.14 or die;

Or at least

use v5.14 or v5.12 ;-)

__END__

Andrew Shitov andy@shitov.ru