Pharo is a modern and powerful Smalltalk environment that is open source, supports many platforms, and actively adds new features. Version 5.0 includes performance improvements from the new Spur VM, as well as new debugging tools and a unified FFI. An example web application built with Teapot and PunQLite demonstrates how easily full-stack web applications can now be developed in Pharo.

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.