Status of CJK language support in LibreOffice 2024 (in COSCUP 2024)

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Status of CJK language support in
LibreOffice 2024
Shinji Enoki
shinji.enoki@libreoffice.org
in COSCUP 2024
2024-08-04

2
Shinji Enoki (榎真治)
● From Settsu City, Japan
● Part of Osaka Prefecture. I moved here a month ago.
● Member of LibreOffice Japanese Team (2011-)
● Membership Committee substitute members
of The Document Foundation (2020-)
● Activity: organizing events, building communities,
sometimes Q&A, QA, translate

This is my 6th COSCUP
●
I joined COSCUP 2018 and 2019, 2021(online), 2022(online),
2023(online)
●
I'm happy to be able to join in person after a long time.

5
LibreOffice Asia Conference 2024
● This year it was held in Taiwan, together with COSCUP
2024
● 8/2 Government Day @ Minsheng Building
● 8/3 Community Day @ NTUST (COSCUP LibreOffice track)
● https:/
/conf.libreoffice.asia/

6
Agenda
● About CJK functions of LibreOffice
● Recent CJK issues
● Recent efforts in the LibreOffice community

7
Have you heard the term "CJK" before?

8
What are CJK issues / bugs
● CJK is an abbreviation for “Chinese-Japanese-Korean”
● Chinese, Japanese, and Korean are different languages, but
they have some common features
● For example, they use kanji-based characters use vertical
writing, etc...

About CJK functions of LibreOffice

10
Overview of LibreOffice CJK functions
● Multibyte character
● Text Layout
● Vertical writing
● Phonetic guides (ruby)
● Page Formats, include Line Composition
● Input methods
● Fonts
● etc...

11
Multibyte character
● Use Unicode to handle multibyte characters
● UTF-8, UTF-16, UTF-32 (Character Encoding Form)
https://ja.wikipedia.org/wiki/Unicode

12
Unicode Surrogate Pairs
● Expressing variations in characters
● 16 bit x 2
● There was a bug in LibreOffice before, but now it's fine

13
● Other character codes were also used in the past. For
Japanese there were three:
● ISO-2022-jp (JIS Code)
● EUC-JP (Extended Unix Code)
● Shift-JIS (SJIS)
● Sometimes it's not just a CJK bug, but a multi-byte issue
that affects other languages

14
Vertical writing
● Writer: [Page Style] setting can be set to vertical writing

15
Vertical writing (In various places)
縦
書
Shape

16
Justification (Line Adjustment)
● Japanese justification: Calculations based on multiple
conditions are required

18
Differences in rules among CJK
● There are many CJK features that have different
requirements and behavior depending on the language
● The position and shape of commas are different between
Chinese and Japanese.

19
Reference: W3C Requirements documents
● Requirements for Japanese Text Layout
● https:/
/www.w3.org/TR/jlreq/
● “This document describes requirements for general Japanese layout realized with
technologies like CSS, SVG and XSL-FO. ”
●
Requirements for Chinese Text Layout 中文排版需求 (01 July 2023 updated)
● https:/
/www.w3.org/TR/clreq/
● “This document was developed by people working in different areas, using both
Simplified and Traditional Chinese. ”
● Requirements for Hangul Text Layout and Typography
● https:/
/www.w3.org/TR/klreq/

20
References book
● CJKV Information Processing, 2nd Edition(Ken Lunde,
O'Reilly Media, Inc., December 2008)
● https:/
/learning.oreilly.com/library/view/cjkv-information-pro
cessing/9780596156114/

21
Other slides
● COSCUP 2019
● https:/
/www.slideshare.net/eno_eno/state-of-cjk-issues-of-libreoffice-2019
● COSCUP 2021
● https:/
/www.slideshare.net/eno_eno/state-of-cjk-issues-of-libreoffice-2021-in-coscup
● COSCUP 2022
● https:/
/www.slideshare.net/eno_eno/improve-features-about-our-language-cjk-issues
-of-libreoffice-in-2022
● LibreOffice Conference 2021
● https:/
/www.slideshare.net/eno_eno/state-of-cjk-issues-of-libreoffice-2021-edition

23
Meta issue for CJK
● Bug 83066 : [META] CJK (Chinese, Japanese, Korean, and Vietnamese)
language issues
● Meta issue for each CJK language
● Bug 113193 : [META] Traditional Chinese (zh_TW, zh_HK)
● Bug 113194 : [META] Simplified Chinese (zh_CN)
● Bug 113195 : [META] Japanese CJK issues
● Bug 113196 : [META] Korean
● Bug 119352 : [META] Language issues
Basically, Bug 83066 is used

●
There is a list link in "Depends on"
for easy tracking

25
Japanese, vertical CTL text: some pasted text
displayed incorrectly: Bug#155772
● In Writer, there are occasionally overlap
in the vertical writing.
● Fixed 25.2.0 by Jonathan Clark

26
PDF export overlaps CJK characters when document has
both vertical and horizontal text: Bug 157390
● Problems exporting to PDF
●
● Fixed in 24.8.0.2
by Jonathan Clark
● (demo)

27
Full-width list numbering incorrectly uses Latin digits for
lines beginning with Latin characters : Bug 161804
● When multibyte is selected
in Writer list symbol
● Not fixed
● (Demo)

28
Does not display some characters when inputting
Japanese: Bug#152293
● During Japanese input, the part exceeding the width of the cell is
not displayed
● Only windows
● Still not fixed
● I don't know if
this is only
in Japanese

29
Bug 161145 - Japanese characters (kanjis, hiragana,
katana...) have an extra spacing since version LO 7
● Not fix
● This is a
regression
● (demo)
6.4
24.2

Recent efforts in the LibreOffice community

35
Challenges: CJK developers
● This year, a full-time developer joined the TDF staff.
● Jonathan Clark
● He is in charge of multilingual issues such as RTL/CTL/CJK
● H had meetups with RTL and JA communities, and he is
checking and fix various Bugzilla issues.

37
Communication at events
● Franklin Weng from Taiwan a keynote at LibreOffice Kaigi
(Japan's annual event), 1 month ago

38
Improve each other's language support
through communication
● We often have the same CJK/other problem
● Problems may be easier to solve if there is more
collaboration
● Bugzilla, Telegram / Matrix chat, ML, Conference

39
Ask LibreOffice
● https:/
/ask.libreoffice.org/c/chinese-traditional/11
●

40
Conclusion
● LibreOffice has various CJK functions, mostly okay, but
sometimes broken
● Introduced some CJK bugs
● Now, TDF has one developer
● CJK volunteer contributors could better resolve CJK issues
with more collaboration

41
Thank you
●
Shinji Enoki
●
Email: shinji.enoki@libreoffice.org
●
I will be at the Japanese Community booth in the afternoon.

Status of CJK language support in LibreOffice 2024 (in COSCUP 2024)

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