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不完整的 \iftrue; 错误

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不完整的 \iftrue; 错误

我使用不同的 if 条件组合成一个名称。如果所有 if 条件都为假，并且最后一个条件为真，则该名称有效。如果第一个条件为真，则会出现错误，Incomplete \iftrue; all text was ignored after line 22.我真的不知道哪里出了问题。

编辑：我尝试为 vonname 添加一个条件，但似乎不起作用……它说命令\@name未定义。我相应地更改了下面的代码。

\documentclass{article}

\makeatletter
% Name display:
% Include vonname:
\newif\if@displayvon
%\DeclareOption{vonname=true}{\@displayvontrue}
% Displaystyles:
\newif\if@lastfirstvonname
%\DeclareOption{namedisplay=lastfirstvon}{\@lastfirstvonnametrue}
%\DeclareOption{namedisplay=lastfirst}{\@lastfirstvonnametrue}
\newif\if@vonlastfirstname
%\DeclareOption{namedisplay=vonlastfirst}{\@vonlastfirstnametrue}


%\let\if@lastfirstvonname\iftrue

\newcommand{\firstname}[1]{\def\@firstname{#1}}
\newcommand{\vonname}[1]{\def\@vonname{#1}}
\newcommand{\lastname}[1]{\def\@lastname{#1}}
%\newcommand{\@name}{\@firstname\ \@vonname\ \@lastname}
\if@lastfirstvonname
    \if@displayvon
        \def\@name{\@lastname,\ \@firstname\ \@vonname}
    \else
        \def\@name{\@lastname,\ \@firstname}
\else
    \if@vonlastfirstname
        \if@displayvon
            \def\@name{\@vonname\ \@lastname,\ \@firstname}
        \else
            \def\@name{\@lastname,\ \@firstname}
    \else
        \if@displayvon
            \def\@name{\@firstname\ \@vonname\ \@lastname}
        \else
            \def\@name{\@firstname\ \@lastname}
\fi\fi\fi\fi\fi
\makeatother

\firstname{First}
\vonname{Von}
\lastname{Last}

\begin{document}
hello, my name is \par
\makeatletter
\@name
\makeatother

\end{document}

答案1

考虑在结尾处也使用\if...\else代码缩进\fi。这样应该可以清楚地表明条件\if... \else...\fi结构的开始和结束位置。

以下是该结构的视觉效果：

\if@lastfirstvonname % <--------------------------------------------------IF---\
  \if@displayvon % <------------------------------------IF---\                  |
    \def\@name{\@lastname,\ \@firstname\ \@vonname}%          |                 |
  \else % <---------------------------------------------ELSE--|                 |
    \def\@name{\@lastname,\ \@firstname}%                     |                 |
  \fi % <-----------------------------------------------FI---/                  |
\else % <-----------------------------------------------------------------ELSE--|
  \if@vonlastfirstname % <---------------------------------------IF---\         |
    \if@displayvon % <----------------------------------IF---\         |        |
      \def\@name{\@vonname\ \@lastname,\ \@firstname}%        |        |        |
    \else % <-------------------------------------------ELSE--|        |        |
      \def\@name{\@lastname,\ \@firstname}%                   |        |        |
    \fi % <---------------------------------------------FI---/         |        |
  \else % <------------------------------------------------------ELSE--|        |
    \if@displayvon % <----------------------------------IF---\         |        |
      \def\@name{\@firstname\ \@vonname\ \@lastname}%         |        |        |
    \else % <-------------------------------------------ELSE--|        |        |
      \def\@name{\@firstname\ \@lastname}%                    |        |        |
    \fi % <---------------------------------------------FI --/         |        |
  \fi % <--------------------------------------------------------FI---/         |
\fi % <-------------------------------------------------------------------FI---/

您使用的一组结束符\fi没有正确关闭组，导致某些\if子句没有相应的\fi结束符。

答案2

你有三个 \if ...你也需要三个的原因\fi：

\if@lastfirstvonname
    \newcommand{\@name}{\@lastname,\ \@firstname\ \@vonname}
\else
    \if@vonlastfirstname
        \newcommand{\@name}{\@vonname\ \@lastname,\ \@firstname}
    \else
        \if@firstvonlastname
            \newcommand{\@name}{\@firstname\ \@vonname\ \@lastname}
        \else
            \newcommand{\@name}{\@firstname\ \@vonname\ \@lastname}
\fi\fi\fi

或者

\if@lastfirstvonname
    \if@displayvon
        \def\@name{\@lastname,\ \@firstname\ \@vonname}
    \else
        \def\@name{\@lastname,\ \@firstname}
    \fi
\else
    \if@vonlastfirstname
        \if@displayvon
            \def\@name{\@vonname\ \@lastname,\ \@firstname}
        \else
            \def\@name{\@lastname,\ \@firstname}
        \fi  
    \else
        \if@displayvon
            \def\@name{\@firstname\ \@vonname\ \@lastname}
        \else
            \def\@name{\@firstname\ \@lastname}
        \fi
    \fi
\fi

答案3

你的顺序\if… … \else … \fi是错误的，例如这里：

\if@lastfirstvonname
    \if@displayvon
        \def\@name{\@lastname,\ \@firstname\ \@vonname}
    \else
        \def\@name{\@lastname,\ \@firstname}
\else

你有\if… … \else … \else，这是不允许的。

所以我认为你想要这样的东西：

\documentclass{article}

\makeatletter
% Name display:
% Include vonname:
\newif\if@displayvon
%\DeclareOption{vonname=true}{\@displayvontrue}
% Displaystyles:
\newif\if@lastfirstvonname
%\DeclareOption{namedisplay=lastfirstvon}{\@lastfirstvonnametrue}
%\DeclareOption{namedisplay=lastfirst}{\@lastfirstvonnametrue}
\newif\if@vonlastfirstname
%\DeclareOption{namedisplay=vonlastfirst}{\@vonlastfirstnametrue}

\newcommand{\firstname}[1]{\def\@firstname{#1}}
\newcommand{\vonname}[1]{\def\@vonname{#1}}
\newcommand{\lastname}[1]{\def\@lastname{#1}}

\if@lastfirstvonname% outer \if… … \else … \fi started
    \if@displayvon% inner \if… … \else … \fi started
        \def\@name{\@lastname,\ \@firstname\ \@vonname}
    \else% else of inner \if… … \else … \fi
        \def\@name{\@lastname,\ \@firstname}
    \fi% inner \if… … \else … \fi finished
\else
    \if@vonlastfirstname% middle \if… … \else … \fi started
        \if@displayvon% inner \if… … \else … \fi started
            \def\@name{\@vonname\ \@lastname,\ \@firstname}
        \else% else of inner \if… … \else … \fi
            \def\@name{\@lastname,\ \@firstname}
        \fi% inner \if…  … \else … \fi finished
    \else% else of middle \if… … \else … \fi
        \if@displayvon% inner \if… … \else … \fi started
            \def\@name{\@firstname\ \@vonname\ \@lastname}
        \else% else of inner \if… … \else … \fi
            \def\@name{\@firstname\ \@lastname}
        \fi % inner \if… … \else … \fi finished
    \fi % middle \if… … \else … \fi finished
\fi % outer \if… … \else … \fi finished    
\makeatother

\firstname{First}
\vonname{Von}
\lastname{Last}

\begin{document}
hello, my name is \par
\makeatletter
\@name
\makeatother

\end{document}

我已经对所有嵌套的部分进行了评论\if… … \else … \fi，以使其更加清晰。

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