Kinsoku 禁則

What are kinsoku? 「禁則」とは何なのか？

Kinsoku are typographic conventions for line breaking in Japanese typesetting.

Class	Can't begin a line	Can't finish a line
Small kana	ぁぃぅぇぉっ...	N/A
Parentheses	）〉》】...	（〈《【...
Quotations	」』”...	「『“...
Punctuation	、。・！？...	N/A

What is in this repository? このリポジトリには何があるか？

• makefile: Compiles the document to a PDF with XeLaTeX, links references with BibTeX and compiles again to make sure references are correct. XeLaTex is required for the xeCJK package to work.
• main.tex: A minimal LaTeX document to compile with make.
• cjk_support.tex: Loads the xeCJK package to support Japanese input and inputs no_breaks.tex.
• no_breaks.tex: Sets a fontface and new character classes for the relevant characters. Inputs the penalties defined below.
• no_break_before.tex and no_break_after.tex: Define characters that should not be begin/end lines and add penalties to line breaking as appropriate. Uncomment a line to highlight the relevant characters in red/blue.

How do I use it? どのように使えばいいのか？

Simple use 簡単な利用

Simply copy and paste cjk_support.tex, no_breaks.tex, no_break_before.tex and no_break_after.tex into the same directory as your main LaTeX file and put \input{cjk_support} into the preamble.

As an example, we use Google's Noto Sans CJK JP and Noto Sans Mono CJK JP, but if these are not installed on your system simply change the fonts set in cjk_support.tex and no_breaks.tex to one you prefer.

Since cjk_support.tex also imports xeCJK, you may want to comment this line out if you are already importing it or just \input{no_breaks} in your preamble. LaTeX will justify lines as needed, so you won't need to do any manual adjustment.

Adding rules 規則の追加

Add a line of the following form to the relevant file with the other definitions.

\XeTeXcharclass`<new_char>=\noBreakBefore % no_break_before.tex
\XeTeXcharclass`<new_char>=\noBreakAfter % no_break_after.tex

Acknowledgements

Thanks to Cicada and Hironobu YAMASHITA who helped me in this thread. The main idea was Cicada's.