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l3keys：如何“生成”`.inherit:n` 的 `.inherit:V` 变体

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l3keys：如何“生成”`.inherit:n` 的 `.inherit:V` 变体

根据文档，

⟨key⟩ .inherit:n = {⟨parents⟩}
Specifies that the ⟨key⟩ path should inherit the keys listed as ⟨parents⟩.

因为许多父母都聚集在一起\l_MY_parents_clist，我会受益于

⟨key⟩ .inherit:V = \l_MY_parents_clist,

不幸的是，.inherit:V密钥变体不存在，我该怎么办？

下面是一个工作代码，它使用辅助函数从头开始创建一个 keyval 列表，并使用辅助变量来存储它。有没有更高效的方法？

% !TeX program = lualatex
\documentclass{article}
\begin{document}
\noindent
\ExplSyntaxOn
\clist_set:Nn \l_tmpa_clist { parent, grand_parent }
\cs_set:Npn \MY_helper:Nn #1 #2 {
  \tl_put_right:Nn #1 {
    child .inherit:n = { #2 },
  }
}
\tl_clear:N \l_tmpa_tl
\exp_args:NNV
\MY_helper:Nn \l_tmpa_tl \l_tmpa_clist
\exp_args:NnV 
\keys_define:nn { } \l_tmpa_tl

TESTING:\\
\keys_define:nn { parent } {
  test .code:n = TEST: #1\\,
}
\keys_set:nn { child } {
  test = blah,
}
\keys_define:nn { grand_parent } {
  grand-test .code:n = GRAND-TEST: #1\\,
}
\keys_set:nn { child } {
  grand-test = blah,
}
\end{document}

答案1

你可以将其构造得更像

\documentclass{article}
\begin{document}

\ExplSyntaxOn
\clist_set:Nn \l_tmpa_clist { parent, grand_parent }

\cs_set:Npn \MY_helper:nnn #1 #2 #3 {
     \keys_define:nn { #1 } {#2 .inherit:n = { #3 }}
  }

\cs_generate_variant:Nn \MY_helper:nnn {nnV}

\MY_helper:nnV {} {child} \l_tmpa_clist

TESTING:\\
\keys_define:nn { parent } {
  test .code:n = TEST: #1\\,
}
\keys_set:nn { child } {
  test = blah,
}
\keys_define:nn { grand_parent } {
  grand-test .code:n = GRAND-TEST: #1\\,
}
\keys_set:nn { child } {
  grand-test = blah,
}
\end{document}

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