嵌套宏：ifnum 的问题

Question

我正在设计 2 个宏，但嵌套它们失败了，我看不出我哪里犯了错误。

第一个宏取一个浮点数（例如 3.2）并再次检查 3 个阈值。第二个宏根据阈值显示一个标签。

两个宏单独工作，但嵌套它们会带来我无法解决的错误：

! Incomplete \iffalse; all text was ignored after line 61.
<inserted text> 
\fi 

以下是代码：

\documentclass{article}
\usepackage{xcolor}
\usepackage[skins]{tcolorbox}
\tcbuselibrary{xparse}

\newcommand*{\ScoreHigh}{7.0}
\newcommand*{\ScoreLow}{3.0}

% Will output None, Low or High depending on the input
\newcommand{\category}[1]{%
    \pgfmathparse{#1 < \ScoreLow}
    \ifnum\pgfmathresult=1
        None%
    \else
        \pgfmathparse{#1 < \ScoreHigh}
        \ifnum\pgfmathresult=1
            Low%
        \else
            High%
        \fi%
    \fi%
}

\colorlet{color@None}{black!20}
\definecolor{color@Low}{rgb}{0.0, 0.65, 0.31}
\colorlet{color@High}{orange}

\DeclareTotalTCBox{\Tag}{m}{
    enhanced,nobeforeafter,
    tcbox raise base,
    boxrule=0.4pt,
    top=0mm,bottom=0mm,right=1mm,left=1mm,
    boxsep=2pt,
    colframe=color@#1,
    colback=tcbcolframe,
    coltext=black,
}{#1}%

\MakeRobust\Tag

\ifdefined\pdfstringdefDisableCommands
\pdfstringdefDisableCommands{\def\Tag#1{'#1'}}
\fi

\setlength{\parindent}{0pt}

\begin{document}

$5.3/10 \rightarrow$  category \textbf{\category{5.3}}.

\bigskip

This is a \Tag{Low} tag.

\Tag{\category{5.3}} % <--- Chaining these command fail
    
   
\end{document}

事实上，错误与第 61 行有关，因为该行是嵌套宏的。

有什么想法表明我为什么可能会失败吗？

Answer 1

pgf 计算不可扩展。但你可以改用 expl3 和 l3fp：

\documentclass{article}
\usepackage{xcolor}
\usepackage[skins]{tcolorbox}
\tcbuselibrary{xparse}

\newcommand*{\ScoreHigh}{7.0}
\newcommand*{\ScoreLow}{3.0}

% Will output None, Low or High depending on the input
\ExplSyntaxOn
\newcommand{\category}[1]{
 \fp_compare:nNnTF {#1}<{\ScoreLow}{None}
  {
    \fp_compare:nNnTF{#1}<{\ScoreHigh}
     {Low}{High}
  }}
\ExplSyntaxOff
\colorlet{color@None}{black!20}
\definecolor{color@Low}{rgb}{0.0, 0.65, 0.31}
\colorlet{color@High}{orange}

\DeclareTotalTCBox{\Tag}{m}{
    enhanced,nobeforeafter,
    tcbox raise base,
    boxrule=0.4pt,
    top=0mm,bottom=0mm,right=1mm,left=1mm,
    boxsep=2pt,
    colframe=color@#1,
    colback=tcbcolframe,
    coltext=black,
}{#1}%

\MakeRobust\Tag

\ifdefined\pdfstringdefDisableCommands
\pdfstringdefDisableCommands{\def\Tag#1{'#1'}}
\fi

\setlength{\parindent}{0pt}

\begin{document}
\Tag{\category{5.3}} 
\Tag{\category{-1}}
\Tag{\category{8}}

\end{document}