The document discusses the importance of character encoding in web application development, highlighting various encoding types like UTF-8, UTF-16, and UTF-32. It emphasizes the need for appropriate character sets to be specified across different layers, including clients, connections, and servers to ensure proper text representation. Additionally, it touches upon the role of Ruby versions and database collation settings when handling multilingual content.

1. International Web Application Development

2. ookina umi no youni gengo ga arimasu.
There is an ocean of language.
http://www.flickr.com/photos/jimbrekke/429292020/

3. demo watashitachiwa webu apurike-shon o
kaihatsusuro toki...
But when we develop web applications...

4. ido no nakano kaeru no youni
we are like the frog in the well,
http://www.flickr.com/photos/clickykbd/2650909663/

5. jibuntachi no gengo dake o kangaemasu
only thinking about our own language
http://www.flickr.com/photos/clickykbd/2650909663/

6. demo webu wa ookina umi noyouina mono desu.
but the web is a big ocean.
http://www.flickr.com/photos/jimbrekke/429292020/

7. Sarah Allen
@ultrasaurus
Mightyverse
sara aren desu. mightyverse o kaihatsu shite imasu

8. San Francisco
san furanshisuko ni sunde imasu.

9. Mightyverse

10. mojibake

11. Character Encoding
UTF8 JIS
UTF16 Shift-JIS
UTF32 EUC

12. Encoding Vocabulary
Code point one or
more bytes that represent
a single character

13. Unicode
UTF8 - variable length
(1, 2, 3, or 4 bytes)
UTF16 - variable length
(2 or 4 bytes)
UTF32 - fixed width (4 bytes)

14. UTF8
U+000 to U+127 1 byte
ASCII = UTF8
High bit indicates more bytes

15. High bits are used to indicate how many bytes are used to
represent a specific character. Software can easily read a
UTF8 stream, even starting in the middle.
http://tools.ietf.org/html/rfc3629#section-3

16. UTF8
Common for internet and file system
format
• XML: default encoding
• Flash: only encoding

17. UTF8 Disadvantages
UTF-8 encoded text may be larger
Possible to split a string mid-character
Excessive unification

18. Caution
Not all implementations are complete
For example, MySql5
supports only 3 bytes for UTF8

19. Most spoken languages can be represented in 3 bytes,
the "Basic Multilingual Plane"
http://www.siriusict.com/2010/08/06/
character-encoding-unicode-utf-8-and-a-bit-of-chauvinism-explained-for-the-masses-2/

20. http://globalmoxie.com/blog/klingon-not-spoken-here.shtml
In May 2001, the Unicode Technical Committee rejected the Klingon proposal;
however, Michael Everson created a mapping of pIqaD into the Private Use
Area of Unicode, which are listed in the ConScript Unicode Registry
(U+F8D0 to U+F8FF).
http://en.wikipedia.org/wiki/Klingon_writing_systems

21. The tengwar font has been proposed for the Unicode standard. The codepoints
are subject to change; the range U+016080 to U+0160FF in the SMP is
tentatively allocated for tengwar according to the current Unicode roadmap.
http://en.wikipedia.org/wiki/Tengwar

22. You need to have an appropriate font installed
to use unicode.
http://en.wikipedia.org/wiki/Tengwar

23. Web Application Story

24. 1. HTML Form post
2. Ruby code
3. Write to Database
4. Output HTML for Display

25. HTML Form Post

26. HTTP headers
• You can specify what character set you
want back when you send a form post
• This is informational for the server
• Just setting these won’t change how your
app behaves, unless your web app has code
for that

27. Ruby code

28. Ruby code
Most web applications don’t parse text
If yours does, you will need to think about
Ruby 1.8 vs. Ruby 1.9

29. Ruby 1.8
>> name = "Yukihiro”
=> "Yukihiro”
>> name[4]
=> 104
>> name[4].chr
=> "h"
>> name = " "
=>"3432012233432022233432012043432012413432
257”
>> name[2]
=> 147
>> name[2].chr
=> ?

30. Ruby 1.9
name = "yukihiro”
=> "yukihiro”
>> name[4]
=> "h"
>> name = " ”
=> " ”
>> name[2]
=> " ”
>> name[0]
=> " "

31. Ruby
Use Ruby 1.9
For Ruby 1.8 (if you must)....
require 'jcode'

32. Database

33. Database
A) Character encoding
i. client
ii. connection
iii. server
B) Collation

34. SQL client connection database

35. check database settings
always use the same character set

36. Collation
Different Languages
Alphabetize Differently

37. Collation
Swedish German
Alingsås Ägypten
Borgholm Äthiopien
Eslöv Afghanistan
Flen Bolivien
Hässleholm Dänemark
Tranås Deutschland
Vetlanda Jamaika
Växjö Marokko
Ängelholm Österreich
Örnsköldsvik Venezuela
Östersund

38. Collation
1. Sorting
2. Equality

40. e é

44. 4
Output HTML for Display

45. Content Type
• Setting the content-type tells the browser
how to display the text
• meta tag
• http header

46. Questions?
http://www.flickr.com/photos/daswunderkind/2689195410/