2016 SoftUmeYa, LLC.

Masashi Umezawa

The 88th Tokyo Smalltalk meetup

What is Pharo?

A most modern and powerful Smalltalk-

language environment

OSS

MIT License

You can read all sources including VM

Aggressive

Not so caring about backward-compatibility

Actively adding new features - Trait, Slot, etc.

Multi-platform

Win, Mac, Linux, iOS, Android

Installation

Just download and extract files http://pharo.org/download

Or, you can just use Zeroconf script

Run the vm with the image file

$ curl get.pharo.org | bash

$ pharo.exe pharo5.0.image

How to use Japanese fonts Open the settings tool by selecting

"System" -> "Settings" and enter the search word

'font'

Toggle the "Use Free Type" check-box to

read local fonts

You can now select

native fonts like

"Meiryo"

New features of Pharo 5.0

Spur VM

Breakpoint, Watchpoint

Unified FFI

Quality Assistant

Spur VM State-of-the-art, newly designed fast VM

About 35% faster than the older Cog VM

Fast #become:

Fast weak reference

Fast, efficient GC

Segmented heap allocation

Pinned objects

64 bit object format

If you concatenate Japanese strings…

Concatenating single- and multi-byte strings

was very slow

because of costly #become:

[10000 timesRepeat: ['abcdefg', 'あいうえおかきくけこ']]

timeToRun

Pharo 4.0

0:00:00:17.573

Pharo 5.0

0:00:00:00.117

Breakpoint, Watchpoint No more "self halt", nor "self inspect"

You can stop message sends at any point

You can check variable changes historically

UFFI "Unified" FFI

Best breeds of FFI, Alien FFI and NativeBoost FFI

self ffiCall: <external function signature>

Callback (call-in) implementation is easier

Library name abstraction layer for multi-platform

support

Good example: PunQLite

UnQLiteFFI>>open: dbHandle named: dbName mode: mode

^ self ffiCall: #( int unqlite_open( db_ptr* dbHandle, String

dbName, uint mode) )

Quality Assistant

Pharo lively analyze your code!

If it is baddy smelled, you can see suggestions

変数への代入は分岐から外出しした方が良くない?

Other features

Debugger UI Renewal

GTDebugger

Simplified UI

Customizable debugger

Rubric

Newly designed text edit component

Develop a richer text-edit in a few lines of code

Slot

Variables are now objects

You can add various hooks to variable accesses

Installing packages Open "Tools" -> "Catalog Browser"

You can easily install packages via catalog

browser

Filter the packages by clicking 'Pharo 5.0' tag

Mustache

A popular template engine

Teapot

Sinatra-like lightweight web-app framework

PunQLite

UnQLite (KVS) binding

=> Now ready for Web App development!

Example: a blog web app (1)

An append-only blog http://localhost:8080/blogs?id=id&text=text

just write a blog via above url

Example: a blog web app (2)

Class definition

Object subclass: #MyTeapotApp

instanceVariableNames: 'teapot db'

classVariableNames: ''

package: 'TeapotApp-Lesson'

Example: a blog web app (3)

Initialization

MyTeapotApp >> initialize

teapot := Teapot configure: #port -> 8080.

db := PqDatabase open:

(FileSystem workingDirectory / 'blogs.db') pathString.

self setupRoutes.

Teapotの設定

PqDatabaseのオープン

Example: a blog web app (4)

Setting up routers

MyTeapotApp >> setupRoutes

teapot

GET: '/blogs' -> [:req | | id value |

id := req at: #id.

value := req at: #text ifAbsent: [''].

db transact: [db appendAt: id value: value].

'blogId'->id. 'text'-> (db at: id)];

output:

(TeaOutput mustacheHtml:

'<h1>Blog:blogId</h1><p>text</p>').

URLパラメータの取り出し

内容をDBに格納

テンプレートの適用

Example: a blog web app (5)

Start/stop

MyTeapotApp >> start

teapot start

MyTeapotApp >> stop

db close.

Teapot stopAll.

Example: a blog web app (6)

"Do it" in Playground

app := MyTeapotApp new start.

app explore

Open web browser

http://localhost:8080/blogs?id=id&text=text

Input some values in the parameters

Other useful links for developers

Github

https://github.com/pharo-project

Pharo continuous build server

https://ci.inria.fr/pharo

Pharo bug tracking system

https://pharo.fogbugz.com

Documents

Tutorials in Pharo

Help -> Pharo Tutorials

Pharo MOOC

Online-streaming seminars

http://files.pharo.org/mooc/

Pharo Books

http://files.pharo.org/books/

Pharo by Example

Deep into Pharo

Enterprise Pharoなど

Summing up

Pharo is a modern, aggressively

progressing Smalltalk

Version 5.0 is the fastest and refined. It

is recommended to migrate to 5.0 if you

are using older Pharo.