What's new in Perl 5.12?

What’s new in Perl . ? Léon Brocard YAPC::Europe Pisa, th August

Me Léon Brocard European, live in London Like food Like the colour orange Founded Amsterdam.pm, Bath.pm, Croydon.pm Now leader of London.pm Started YAPC::Europe Entrepreneur perl hacker

What? Perl perl

Releases - - Perl - - Perl - - Perl - - Perl - - Perl

Major releases - - Perl - - Perl . - - Perl . - - Perl . - - Perl . - - Perl . - - Perl . . - - Perl . . - - Perl . . - - Perl . . - - Perl . . - - Perl . .

Development releases - - Perl . . – Jesse Vincent - - Perl . . – Jesse Vincent - - Perl . . – Léon Brocard - - Perl . . – Jesse Vincent - - Perl . . – Ricardo Signes - - Perl . . – Steve Hay - - Perl . . – Ask Bjørn Hansen - - Perl . . – Léon Brocard - - Perl . . – Ricardo Signes - - Perl . . – Matt Trout - - Perl . . – David Golden

Fixing Perl Core Bugs Grant to David Mitchell from the Perl Foundation , from booking.com “ ere are currently approximately open and new bug reports in the perl bug queue . . . Note that unlike many large open source projects, perl has no paid developers devoted to bug xing”

TPF bug-grant report I haven’t done much in the way of actual xing this week, but I have gone through the or so new/open RT tickets that have (severity >= medium), and marked each one up with one or more of the new ‘type’ custom eld values I recently asked to be added to RT, e.g. ‘Unicode’ or ‘debugger’ — David Mitchell

TPF bug-grant June report h diagnosing bugs h xing bugs h reviewing other people’s bug xes h reviewing ticket histories h review the ticket queue (triage) tickets closed that have been worked on tickets closed related to bugs that have been xed tickets closed that were reviewed but not worked on (triage)

Perl . . Perl . . represents approximately two years of development since version . . and contains over , lines of changes across over , les from over authors.

Perl . . Perl . . represents approximately four weeks of development since Perl . . and contains approximately , lines of changes across les from authors.

Perl . . Perl . . represents approximately one month of development since Perl . . and contains , lines of changes across les from authors.

More tests

Perl . Smart matching given / when Named captures State variables De ned-or say ...

Perl . new features

Most important feature e J.R.R. Tolkien quotes at the head of C source le have been checked and proper citations added /* * Sam sat on the ground and put his head * in his hands. ’I wish I had never come * here, and I don’t want to see no more * magic,’ he said, and fell silent. * * [p.363 of _The Lord of the Rings_, * II/vii: "The Mirror of Galadriel"] */

New package NAME VERSION syntax package Foo::Bar 1.23; # equivalent to: package Foo::Bar; our $VERSION = ’1.23’;

Yada yada sub unimplemented { ... } unimplemented(); # Unimplemented at example.pl line 1.

Implicit strictures use 5.12.0; # means: use strict; use feature ’:5.12’;

Unicode . New scripts: Bamum, Javanese, Lisu, Meetei Mayek, Samaritan, Tai am and Tai Viet. New characters: Abkhaz, Canadian Aboriginal Syllabics, Coptic, Devanagari, Khamti Shan, Malayalam and Myanmar. Also: Gardiner set of Egyptian Hieroglyphs, Imperial Aramaic, Avestan, Kaithi, Old South Arabian and Old Turkic.

Y compliance Perl’s core time-related functions are now Y compliant.

New autodie module Replace functions with ones that succeed or die with lexical scope. use autodie; open(my $fh, ’<’, ’missing’); # Can’t open ’missing’ for reading: ’No such # file or directory’ at ./play.pl line 6

qr// overloading “Since REGEXPs are rst-class objects now, it seems appropriate that they should have an overloaded conversion of their very own. e overload needs to return either a ref to a REGEXP (a qr//) or a bare REGEXP.” Used by Regexp::Grammars

Pluggable keywords Extension modules can now cleanly hook into the Perl parser to de ne new kinds of keyword-headed expression and compound statement. use XS::APItest::KeywordRPN qw(rpn calcrpn); $triangle = rpn($n $n 1 + * 2 /); # generates ops equivalent to: $triangle = ($n * ($n + 1))/2;

More features N experimental regex escape APIs for more internals (Lexical::Import) Overridable function lookup A proper interface for pluggable Method Resolution Orders DTrace support each is now more exible when as a statement modi er Enabling warnings from your shell environment delete local New support for Abstract namespace sockets -bit limit on substr arguments removed

More features ( ) @INC order change REGEXPs are now rst class Switch statement changes Smart match changes suidperl is no longer part of Perl Deprecations warn by default Deprecated modules: Class::ISA, Pod::Plainer, Shell, Switch + Perl .pl les

More features ( ) More speed Less memory Fewer bugs Still compatible

Development releases to come - - Perl . . – Florian Ragwitz - - Perl . . – Jesse Vincent - - Perl . . – Steve Hay - - Perl . . – Tatsuhiko Miyagawa - - Perl . . – Chris Williams

Leading to . . . - - Contentious change freeze - - User-visible change freeze - - Hard freeze - - Perl .

anks Use Perl . now! Any questions?

en. . . Co ee break until : Tomorrow: London.pm August Social, Piazza delle Vettovaglie

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