1.
2016 SoftUmeYa, LLC.
Masashi Umezawa
The 88th Tokyo Smalltalk meetup

2.
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

3.
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

4.
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"

5.
New features of Pharo 5.0
 Spur VM
 Breakpoint, Watchpoint
 Unified FFI
 Quality Assistant

6.
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

7.
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

8.
Breakpoint, Watchpoint
 No more "self halt", nor "self inspect"
 You can stop message sends at any point
 You can check variable changes historically

9.
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) )

10.
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?

11.
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

12.
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!

13.
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

14.
Example: a blog web app (2)
 Class definition
Object subclass: #MyTeapotApp
instanceVariableNames: 'teapot db'
classVariableNames: ''
package: 'TeapotApp-Lesson'

15.
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

16.
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

17.
Example: a blog web app (5)
 Start/stop
MyTeapotApp >> start
teapot start
MyTeapotApp >> stop
db close.
Teapot stopAll.

18.
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

19.
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

20.
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

21.
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.