Description

The xeCJK package affords CJKglue and CJKecglue to allow precise control of inter-token spacing. I hope to be able to do similar in Typst. Specifically, what I intend to resemble is strict grid layout with CJK text.

In this example, the first line is bad because the 4 inter-character spacings between Hanzi/Kanji/Hanja are not zero.

\documentclass[12pt]{standalone}
\usepackage{fontspec,xeCJK}
\xeCJKsetup{PunctStyle=plain,RubberPunctSkip=false}

\begin{document}
    \begin{minipage}{25em}
        \leavevmode
        \vskip 2em
        \center
        \begin{minipage}{13em}
            这样是坏的This way is BAD这样是坏的

            \xeCJKsetup{PunctStyle=plain,RubberPunctSkip=false,CJKglue=\hskip 0pt,CJKecglue=\hskip 4pt plus 100cm minus 0.1pt}            
            
            这样是好的This way is good这样是好的
        \end{minipage}

        \vspace{2em}
    \end{minipage}
\end{document}

Use Case

Strict grid breaks into a few simple rules:

• All Hanzi/Kanji/Hanja, Hiragana, Katakana, and full-width punctuation marks share exactly the same width. I have no idea about Hangeul; hopefully it does not require the same.
• Any inter-character space between 2 of these characters is exactly 0pt wide.
• In a justified line, the duty for stretching (when needed) is equally divided to CJK-nonCJK glues.
• CJK-nonCJK spacing is ok to be arbitrarily large.