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使用“不正确”参数从宏产生错误

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使用“不正确”参数从宏产生错误

我制作了一个接受特定参数的宏。但是，我希望它在遇到意外参数时输出错误。如下所示：

在此处输入图片描述

梅威瑟：

\documentclass{article}

\usepackage{xcolor}
\usepackage{fontawesome}
\usepackage{ifthen}

\definecolor{icons}{HTML}{46A247}

\makeatletter
\newcommand{\@symbolheading}[2]{\large\textcolor{icons}{#1}\hspace{10pt}\textbf{#2}}

\newcommand{\pubtitle}[1]{%
\ifthenelse{\equal{#1}{book}}{\@symbolheading{\faBook}{Book}}{}
\ifthenelse{\equal{#1}{article}}{\@symbolheading{\faFileText}{Article}}{}
}

\makeatother
\begin{document}

\pubtitle{book}

\pubtitle{article}

\pubtitle{invalidArgument}

\end{document}

输出结果如下：

在此处输入图片描述

在这种情况下，我希望它收到\pubtitle{invalidArgument}类似这样的错误消息：

pubtitle command Warning: No supported entry field 'invalidArgument' for bibliography. 
Perhaps you meant '\pubtitle{custom}'?

边注：我想在参考书目中（使用 biblatex）使用此命令，如下所示：\printbibliography[heading=pubtype,type=book,title=\pubtitle{book}]这就是警告说“参考书目输入字段”的原因，因为这就是此命令的用途。

答案1

您需要嵌套\ifthenelse，这很痛苦。

\documentclass{article}

\usepackage{xcolor}
\usepackage{fontawesome}
\usepackage{ifthen}

\definecolor{icons}{HTML}{46A247}

\makeatletter
\newcommand{\@symbolheading}[2]{\large\textcolor{icons}{#1}\hspace{10pt}\textbf{#2}}

\newcommand{\pubtitle}[1]{%
  \ifthenelse{\equal{#1}{book}}{\@symbolheading{\faBook}{Book}}{%
    \ifthenelse{\equal{#1}{article}}{\@symbolheading{\faFileText}{Article}}{%
      \PackageError{pubtitle}{%
        Unsupported entry field '#1' \MessageBreak for bibliography}{%
        Perhaps you meant '\string\pubtitle{custom}'%
      }%
    }%
  }%
}

\makeatother
\begin{document}

\pubtitle{book}

\pubtitle{article}

\pubtitle{invalidArgument}

\end{document}

在控制台上

! Package pubtitle Error: Unsupported entry field 'invalidArgument' 
(pubtitle)                for bibliography.

See the pubtitle package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.30 \pubtitle{invalidArgument}
                               
? h
Perhaps you meant '\pubtitle{custom}'

输出

在此处输入图片描述

如果你想要更多案例，那就太麻烦了。这是一个带有案例切换的版本。

\documentclass{article}

\usepackage{xcolor}
\usepackage{fontawesome}

\definecolor{icons}{HTML}{46A247}

\ExplSyntaxOn

\cs_new_protected:Nn \pubtitle_symbolheading:nn
 {
  \group_begin:
  \large\textcolor{icons}{#1}\hspace{10pt}\textbf{#2}
  \group_end:
 }

\NewDocumentCommand{\pubtitle}{m}
 {
  \pubtitle_pubtitle:n { #1 }
 }

\cs_new_protected:Nn \pubtitle_pubtitle:n
 {
  \str_case:nnF { #1 }
   {
    {book}{\pubtitle_symbolheading:nn{\faBook}{Book}}
    {article}{\pubtitle_symbolheading:nn{\faFileText}{Article}}
    % other cases
   }
   {% none of the above
    \PackageError{pubtitle}
     {
      Unsupported ~ entry ~ field ~ '#1' ~ \MessageBreak for bibliography}
     {
      Perhaps ~ you ~ meant ~ '\string\pubtitle{custom}'
     }
   }
 }

\ExplSyntaxOff

\begin{document}

\pubtitle{book}

\pubtitle{article}

\pubtitle{invalidArgument}

\end{document}

请注意，您的\large声明不受组约束……

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