当未定义或不可用时替换小型大写字母

Question

最后一步编辑3其实很简单：从t1lmss.fd并删除 tex 文件本身中不需要的代码。因此，字体形状的声明被覆盖，同时保持原始 fd 文件完好无损。完整的 tex 文件如下所示：

\documentclass{scrartcl} 

\usepackage[utf8]{inputenc}
\usepackage{lmodern} %\sffamily\selectfont % (not needed if the whole fd file is inserted, which uses \DeclareFontFamily{T1}{lmss}{})
\usepackage[T1]{fontenc}
\usepackage{relsize}
\usepackage{etoolbox}

%%% taken from the .fd file (MiKTeX 2.9\tex\latex\lm\t1lmss.fd) -- this overrides the definitions in the fd file while leaving the original file untouched
\DeclareFontFamily{T1}{lmss}{}
\DeclareFontShape{T1}{lmss}{m}{n}
{<-8.5> ec-lmss8
    <8.5-9.5> ec-lmss9      <9.5-11>  ec-lmss10
    <11-15.5> ec-lmss12     <15.5-> ec-lmss17
}{}
\DeclareFontShape{T1}{lmss}{m}{it}
{<->ssub*lmss/m/sl}{}
\DeclareFontShape{T1}{lmss}{m}{sl}
{<-8.5> ec-lmsso8
    <8.5-9.5> ec-lmsso9      <9.5-11>  ec-lmsso10
    <11-15.5> ec-lmsso12     <15.5-> ec-lmsso17
}{}
%%%%%%% Font/shape undefined, therefore substituted
%\DeclareFontShape{T1}{lmss}{m}{sc}     % <-- deleted
%{<->sub*lmr/m/sc}{}                    % <-- deleted
\DeclareFontShape{T1}{lmss}{b}{n}
{<->ssub * lmss/bx/n}{}
\DeclareFontShape{T1}{lmss}{b}{sl}
{<->ssub * lmss/bx/sl}{}
\DeclareFontShape{T1}{lmss}{b}{it}
{<->ssub * lmss/bx/it}{}
%%%%%%%% semibold condensed series
\DeclareFontShape{T1}{lmss}{sbc}{n}
{<-> ec-lmssdc10}{}
\DeclareFontShape{T1}{lmss}{sbc}{sl}
{<-> ec-lmssdo10}{}
\DeclareFontShape{T1}{lmss}{sbc}{it}
{<->ssub*lmss/sbc/sl}{}
%%%%%%%%% bold extended series
\DeclareFontShape{T1}{lmss}{bx}{n}
{<-> ec-lmssbx10}{}
\DeclareFontShape{T1}{lmss}{bx}{sl}
{<-> ec-lmssbo10}{}
\DeclareFontShape{T1}{lmss}{bx}{it}
{<->ssub*lmss/bx/sl}{}
%%% end of fd file
\normalfont

\newcommand{\fakedsc}[3][1]{#2\begingroup\smaller[#1]{\MakeUppercase{#3}}\endgroup}

\makeatletter
\def\define@newfont{%
    \begingroup
    \let\typeout\@font@info
    \escapechar\m@ne
    \expandafter\expandafter\expandafter
    \split@name\expandafter\string\font@name\@nil
    \try@load@fontshape % try always
    \expandafter\ifx
    \csname\curr@fontshape\endcsname \relax
    \expandafter\gdef\csname \curr@fontshape/sub\endcsname{}% new      
    \wrong@fontshape\else
    \extract@font\fi
    \endgroup}

\newcommand\testsc[3][1]{%
    \ifcsname \f@encoding/\f@family/\f@series/sc/sub\endcsname
    no \fakedsc[#1]{#2}{#3}
    \else 
    \ifcsname \f@encoding/\f@family/\f@series/sc\endcsname  yes \textsc{#2#3} \else no \fakedsc[#1]{#2}{#3} \fi
    \fi   
    }
\makeatother

\begin{document}

    \detokenize{\rmfamily} \textsc{Test} -- \testsc{T}{ested} -- without \fakedsc{T}{est} => test successful, no replacement

    {\bfseries
    \detokenize{\rmfamily} \textsc{Test} -- \testsc{T}{ested} -- without \fakedsc{T}{est}} => test successful, replaced

    \sffamily
    \detokenize{\sffamily} \textsc{Test} -- \testsc{T}{ested} -- without \fakedsc{T}{est} => test finally successful, \detokenize{\fakedsc} used!!!

    {\bfseries
    \detokenize{\sffamily} \textsc{Test} -- \testsc{T}{ested} -- without \fakedsc{T}{est}} => test successful, replaced

\end{document}

正如你所看到的，\sffamily \textsc{Test}现在给出了一个警告，字体形状未定义：

但是，如果\textsc{Test}删除所有部分，则不会显示任何警告。如果需要的话，也许甚至可以警告使用了伪造的小写字母（对我来说，不需要）。

甚至更好：\sffamily \testsc{Tested}没有给予不作为答案（意味着字体形状是没有定义的）\fakedsc并按预期用途：

这是一项艰苦的工作，但我很高兴我终于找到了答案。如果有更简洁的解决方案，我很乐意了解它。

免责声明：

使用此解决方案需要您自行负责，并且只有您能够接受可怕结果。

Answer 1