what we can learn from rebol?

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What can Perl learn from Rebol ?

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Aout philosophy and features of Rebol and how get some of the interesting inside of Perl. Held at YAPC::EU 2010 in Pisa.

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Page 1: What we can learn from Rebol?

What can Perl learn from Rebol ?

Page 2: What we can learn from Rebol?

No Rebol Course

Page 3: What we can learn from Rebol?

some hobby philosophy

Page 4: What we can learn from Rebol?

Perl Philosophy

TIMTOWTDI

simple and possible

context sensitive

Page 5: What we can learn from Rebol?

Philosophy

TIMTOWTDI

simple and possible

context sensitive

Page 6: What we can learn from Rebol?

Quote

Take a dash of PERL, mix with the crossplatform compatibilty of a Java, and make it

extremely easy for beginners to start coding, andyou get the general idea.

Page 7: What we can learn from Rebol?

A Hobby Philosopher

Page 8: What we can learn from Rebol?

„Real“ Philosopher

Page 9: What we can learn from Rebol?

Carl Sassenrath

Page 10: What we can learn from Rebol?

Carl Sassenrath

- Apple, HP and Commodore

Page 11: What we can learn from Rebol?

Carl Sassenrath

- Apple, HP and Commodore

- Pantaray, American Multimedia, Videostream

Page 12: What we can learn from Rebol?

Carl Sassenrath

- Apple, HP and Commodore

- Pantaray, American Multimedia, Videostream

- REBOL Technologies

Page 13: What we can learn from Rebol?

Carl Sassenrath

- Amiga OS, IOS, VisCorp ED

- CDTV

- Amiga Logo, Next Gen. Forth, Rebol

Page 14: What we can learn from Rebol?

- Distribution

Page 15: What we can learn from Rebol?

- Browser

Page 16: What we can learn from Rebol?

Left Click : Start Rebol App

Page 17: What we can learn from Rebol?

Left Click : Start Rebol App

Page 18: What we can learn from Rebol?

Rebol App

Page 19: What we can learn from Rebol?

Rebol App

Page 20: What we can learn from Rebol?

Rebol App

Page 21: What we can learn from Rebol?

Rebol App

Page 22: What we can learn from Rebol?

- Browser

Page 23: What we can learn from Rebol?

Right Click : Get Meta Data

Page 24: What we can learn from Rebol?

Rebol Editor

Page 25: What we can learn from Rebol?

- Browser

Page 26: What we can learn from Rebol?

Rebol Shell

Page 27: What we can learn from Rebol?

Carl Sassenrath

- Amiga OS, IOS, VisCorp ED

- CDTV

- Amiga Logo, Next Gen. Forth, Rebol

Page 28: What we can learn from Rebol?

Carl Sassenrath

- Amiga OS, IOS, VisCorp ED

- CDTV

- Amiga Logo, Next Gen. Forth, Rebol

Page 29: What we can learn from Rebol?
Page 30: What we can learn from Rebol?

● Lisp, Forth, Logo and Self

Page 31: What we can learn from Rebol?

● Lisp, Forth, Logo and Self

● Lightweight Distributed Computing

Page 32: What we can learn from Rebol?

● Lisp, Forth, Logo and Self

● Lightweight Distributed Computing

● programming-in-the-small (PITS)

Page 33: What we can learn from Rebol?

PITS:

~ 800kB binary 1.8 MB for distribution

Libs Tools SamplesDocs Links

Page 34: What we can learn from Rebol?

PITS:

Remote Editor: 53Daytime Server Deamon: 61

bmp2png ConverterTCP Port Scanner: 98Simple Clock App: 106

Minimal Email Client: 130Simple Picture Viewer: 132

Page 35: What we can learn from Rebol?

PITS:

Remote Editor: 53Daytime Server Deamon: 61

bmp2png ConverterTCP Port Scanner: 98Simple Clock App: 106

Minimal Email Client: 130Simple Picture Viewer: 132

Page 36: What we can learn from Rebol?

PITS:

view layout [ f: field btn"Edit"[editor to-url f/text]]

Page 37: What we can learn from Rebol?

● Lisp, Forth, Logo and Self

● Lightweight Distributed Computing

● programming-in-the-small (PITS)

Page 38: What we can learn from Rebol?

● Lisp, Forth, Logo and Self

● Lightweight Distributed Computing

● fighting software complexety

Page 39: What we can learn from Rebol?

● Lisp, Forth, Logo and Self

● Lightweight Distributed Computing

● fighting software complexety

Page 40: What we can learn from Rebol?
Page 41: What we can learn from Rebol?

Silent Scream: Rebel with a cause

Page 42: What we can learn from Rebol?

Relative Expression-Based Object Language

Page 43: What we can learn from Rebol?

Relative Expression-Based Object Language

eval that like REBOL does:

back to front

Page 44: What we can learn from Rebol?

Relative Expression-Based Object Language

the obvious, don't argue with that

Page 45: What we can learn from Rebol?

Relative Expression-Based Object Language

sounds like OOP ?

Page 46: What we can learn from Rebol?

Relative Expression-Based Object Language

● no OOP like Ruby or Perl 6

Page 47: What we can learn from Rebol?

Relative Expression-Based Object Language

● no OOP like Ruby or Perl 6

● Object means here just „thing“

Page 48: What we can learn from Rebol?

Relative Expression-Based Object Language

That brings no meaning anyway :)

There are same principles it's based on

Page 49: What we can learn from Rebol?

Relative Expression-Based Object Language

Sounds like a functional language ?

Page 50: What we can learn from Rebol?

Relative Expression-Based Object Language

(not pure) functional (since 2.0)

Page 51: What we can learn from Rebol?

Relative Expression-Based Object Language

Page 52: What we can learn from Rebol?

Relative Expression-Based Object Language

● Thats's the main message

Page 53: What we can learn from Rebol?

Relative Expression-Based Object Language

● Thats's the main message

● That's how Rebol syntax works

Page 54: What we can learn from Rebol?

Relative Expression-Based Object Language

● Thats's the main message

● That's how Rebol syntax works

● In Perl we call that context sensitive

Page 55: What we can learn from Rebol?

Relative Expression-Based Object Language

read http://www.perl.org/learn.html

read %info.txt

Page 56: What we can learn from Rebol?

Rebol Perl 5

read http://www.perl.org/learn.html use LWP::Simple;

get("http://www.perl.org/learn.html");

text: read %info.txt use File::Slurp; my $text = slurp( 'info.txt' ) ;

Page 57: What we can learn from Rebol?

Rebol Perl 6

read http://www.perl.org/learn.html use HTTP::Client;

HTTP::Client.new.get("http://www.perl.org/learn.html");

text: read %info.txt my $text = slurp( 'info.txt' ) ;

Page 58: What we can learn from Rebol?

welcome to the strange land

Page 59: What we can learn from Rebol?

shock therapy

Page 60: What we can learn from Rebol?

, forget all you know

no variablesno hashes

no precedence table (2 + 3 * 2 == 10)no builtins

no Subroutinensometimes scopes

no name spaces (befor Rebol 3)no Regex (parse)

Page 61: What we can learn from Rebol?

All is gone?

Page 62: What we can learn from Rebol?

You have to know 4 concepts

Page 63: What we can learn from Rebol?

4 Terms

words:

data types:

series:

refinements:

Page 64: What we can learn from Rebol?

4 Terms

words: typeless data container

data types:

series:

refinements:

Page 65: What we can learn from Rebol?

4 Terms

words: variables, routines, buildins

data types:

series:

refinements:

Page 66: What we can learn from Rebol?

4 Terms

words: variables, routines, buildins

data types: integer, string, char, tuple, pair, block,

series:

refinements:

Page 67: What we can learn from Rebol?

4 Terms

words: variables, routines, buildins

data types: integer, string, char, tuple, pair, block,money, file, url, email, tag, binary, date, time, issue

series:

refinements:

Page 68: What we can learn from Rebol?

4 Terms

words: variables, routines, buildins

data types: integer, string, char, tuple, pair, block,money, file, url, email, tag, binary, date, time, issue

series:

refinements:

Page 69: What we can learn from Rebol?

4 Terms

words: variables, routines, buildins

data types: integer, string, char, tuple, pair, block,money, file, url, email, tag, binary, date, time, issue

series: lists, hashes, code

refinements:

Page 70: What we can learn from Rebol?

4 Terms

words: variables, routines, buildins

data types: integer, string, char, tuple, pair, block,money, file, url, email, tag, binary, date, time, issue

series: lists, hashes, code

refinements: (@ / %) slices / return value

Page 71: What we can learn from Rebol?

Perl Rebol# => ;

{} => [] $var = => var:$var => :var

eval $var => var $var[3] => var/3

$var{'sub'} => var/sub sub() => sub

sub($p,$m) => sub p m

Page 72: What we can learn from Rebol?

Perl Rebol

$a++ a: a + 1

Page 73: What we can learn from Rebol?

Perl Rebol

$a = 30 * 3.1415 / 180 sin($a) / cos($a) tangent 30

sin($a) / cos($a) tangent/radians 30

use Math::Trig; tan(deg2rad(30));

Page 74: What we can learn from Rebol?

Perl 6 Rebol

loop => foreverall, any none @a => all, any []

prompt => ask slurp => read

no break in switchPair als nativer Typ

grammars, heavy usage of MMD

Page 75: What we can learn from Rebol?

Meta Data

REBOL [Title:Date:

Version:...

]

Page 76: What we can learn from Rebol?

Meta Data

File: Author: Email: Web: Rights: Requires:

Purpose: { }, Comment: { }, Notes: { }

History: [0.1.1 12-Oct-2008 "add to ... path"

Library: [ ...

Page 77: What we can learn from Rebol?

DSL for GUI

view layout [ text :rise_time

button "Quit" #"q" [quit]]

Page 78: What we can learn from Rebol?

in Perluse Tkx;

Tkx::button(".b", -text => "Hello, world", -command => sub { Tkx::destroy(".") },);

Tkx::pack(".b");

Tkx::MainLoop();

Page 79: What we can learn from Rebol?

in Perluse Prima qw(Application Button);

New Prima::MainWindow( text => "Hello, world", size => [ 200, 200] ,)-> insert( Button => centered => 1, text => "Hello, world", onClick => sub { $::application->close } ,);

run Prima;

Page 80: What we can learn from Rebol?

RebGUI

view layout [ text :rise_time

button "Quit" #"q" [quit]]

Page 81: What we can learn from Rebol?

DSL for Regex

expr: [term ["+" | "-"] expr | term] term: [factor ["*" | "/"] term | factor]

factor: [primary "**" factor | primary] primary: [some digit | "(" expr ")"]

digit: charset "0123456789"

probe parse "1 + 2 * ( 3 - 2 ) / 4" expr== true

Page 82: What we can learn from Rebol?

DSL for Regex

parse read http://www.gaisma.com/en/location/halle.html [ thru <td class="sunshine"><i> copy rise_time to </i> ]

Page 83: What we can learn from Rebol?

Functional DSL

does

func

function

Page 84: What we can learn from Rebol?

DSL for OOP

make

Page 85: What we can learn from Rebol?

Rebol 3

Open Source

Unicode

Debug Hooks

Better GUI Objects

Page 86: What we can learn from Rebol?

Ideas

Io::All

Perlapi

Modules

Prima