"Lego Programming" with Lorzy

Lorzy: “Lego Programming” in Perl Chia-liang Kao <clkao@clkao.org> YAPC::Asia 2009, Tokyo

自己介紹

id:clkao

高嘉良

台湾人

日本語

日本語不會

Takesako Inline::x86

Just In Time

Just In Time Slides

Just In Time Software!

no translation

RT: Request Tracker

In Perl!

We Perl

$normal_user ☠ Perl

Lorzy: Lazy, Lispy, Orz

• Scheme-like interpreter in Perl • Typeful • uses Moose & Moose type system

Example

Deﬁning Rules, Actions

(Think gmail ﬁlters)

(lambda (ticket transaction) <HERE>) :: Bool

sub { my ($ticket, $transaction) = @_; <HERE> } # returns Bool

If ticket’s queue matches “Foo”

$ticket->queue->name eq “Foo”

S-Expression

(Str.Eq (RT::Model::Queue.name (RT::Model::Ticket.queue ticket)) “Foo”)

Strongly Typed

(Types are Good)

Problem

$ticket->queue->name eq “Foo”

???!!!

Type mismatch!

Any function that takes Str and returns Bool

Any function that takes a and returns b

RT::Model::Ticket Bool

Any function that takes a and returns a

Bool Bool

Backend: lcore

We want a sandbox

Dump database password, etc...

In Perl Environment

First attempt: ~2003 Audrey & Jesse

Type mismatch!

Second attempt: ~2008

lcore: ~600 lines

iTunes

iTunes not?

iTunes

iTunes and/or?

iTunes

iTunes ArrayRef[Bool]

MooseX::Types::Applicative

map isa => “CodeRef[CodeRef[a,b], ArrayRef[a], ArrayRef[b]]”

should be (a → Bool)

Load existing rules into the UI

Conclusion

Visual Programming Environment

Sandbox for providing user extensions

All about Types!

Live Demo!

http://github.com/bestpractical/rt/tree/lcore http://github.com/bestpractical/lcore

clkao@clkao.org Hackathon on weekend!

Questions?

"Lego Programming" with Lorzy

by clkao on Sep 11, 2009

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