当使用 a 的一个选项时，返回的字符串\str_case为noseperator空。我不明白为什么...
\documentclass{article}
\RequirePackage{booktabs}
\usepackage[mode=text, reset-text-series = false, separate-uncertainty, group-digits=integer, group-minimum-digits = 4]{siunitx}
\sisetup{group-separator = {\,}, input-decimal-markers={,.}, output-decimal-marker = {,}}
\ExplSyntaxOn
\str_new:N \g__eur_length_str
\NewDocumentCommand{\setcurrencyformat}{m}
{
\str_gset:Nn \g__eur_length_str { #1 }
}
\NewDocumentCommand{\EUR}{om}
{
\currency_print_value:nnn { #1 } { #2 } { € }
}
\NewDocumentCommand{\currency}{om}
{
\currency_print_value:nnn { #1 } { #2 } { }
}
\cs_new_protected:Nn \currency_print_value:nnn
{
\IfNoValueTF{#1}
{% no optional argument
\currency_print:Vnn \g__eur_length_str { #2 } { #3 }
}
{% optional argument present
\currency_print:nnn { #1 } { #2 } { #3 }
}
}
\tl_new:N \l__currency_temp_tl
\cs_new_protected:Nn \currency_print:nnn
{
\str_if_eq:nnTF {#3} { }
{ % empty
\tl_set:Nn \l__currency_temp_tl {}
}
{ % not empty
\tl_set:Nn \l__currency_temp_tl { \nobreakspace \unit{#3} }
}
\str_case:nn { #1 }
{
{ full } { \num[group-separator = {.}, minimum-decimal-digits = 2]{#2} \tl_use:N \l__currency_temp_tl }
{ standard }{ \num[group-separator = {.}, round-mode = places, round-precision = 2]{#2} \tl_use:N \l__currency_temp_tl }
{ min } { \num[group-separator = {.}, round-mode = places, round-precision = 0]{#2} \tl_use:N \l__currency_temp_tl }
{ noseperator } { #2 \tl_use:N \l__currency_temp_tl } % <= returns nothing
}
}
\cs_generate_variant:Nn \currency_print:nnn { V }
\setcurrencyformat{full}
\ExplSyntaxOff
\begin{document}
\currency[noseparator]{123.45678} (currency[noseparator]) % <= returns nothing
\EUR[noseparator]{123.45678} (EUR[noseparator]) % <= returns nothing
\currency{123.45678} (currency)
\currency[full]{123.45678} (currency[full])
\end{document}
答案1
noseperator 不是noseparator