Gerben Wierda via ntg-context schrieb am 30.04.2023 um 09:12:
I am currently testing with a Japanese translation of something I originally created in English using the ConTeXt engine (LMTX).

I run into the fact that Japanese has no use for whitespace, so most of the time TeX has no idea where to break. Is there something I can tell ConTeXt to solve this for me or do I have to alk with the translator to put whitespace in the correct places (kind of breaks the automatic linebreaking of TeX, though)?

Below is a example with some dummy text for a document which contains only japanese. The main points are

    1. to use a font which is suitable for japanese, e.g. Noto Serif/Sans CJK JP and

    2. enable line breaking with \setscript[nihongo].

The \mainlanguage setting is only needed to get japanese labels for chapter, float titles etc.

When you have a document with mixed scripts the approach below doesn't work because
spacing around braces and other punctuation marks is wrong for non japanese text,
this can be fixed but you have to include language switches in your document.

Wolfgang

%%%% begin example
\definefontfamily [noto-jp] [rm] [Noto Serif CJK JP]
\definefontfamily [noto-jp] [ss] [Noto Sans CJK JP]
\definetypeface   [noto-jp] [mm] [math] [pagella] [default]

\setupbodyfont [noto-jp]

\mainlanguage [ja]

\setscript [nihongo]

\starttext

\startbuffer
打構セト読役いゆお及層大コモクカ軟毎ホアヲト極書た球87本野ぎレべ襲画売ぎ関負ら断紀チラネキ質紋キタ資私トゃふん。江コキトサ狂毎現ンづ応通サシ続36島性84界ぼゆゃが実書ちぽふず辞躍事シ世図二ハス盛堀人わレをう第紙きかイの浅69乳キメタ事争つょ社以ヨナム法例やほにル済療にしいむ。子け記多ゅくよ正役モ母憲トぞ説帝け務賞ク付打ワナ内桁ぼでクフ因倒おふフ印気地レタケマ冬4雇各裁微ひるぼ。

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\stopbuffer

\rm \getbuffer

\page

\ss \getbuffer

\stoptext
%%%% end example