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% \iffalse meta-comment
%
% Copyright (C) 2022 by Zhang Tingxuan <alphaztx@163.com>
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3c of this license or (at your option) any later
% version. The latest version of this license is in:
%
%   http://www.latex-project.org/lppl.txt
%
% and version 1.3 or later is part of all distributions of
% LaTeX version 2005/12/01 or later.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Zhang Tingxuan.
%
% This work consists of the files pangram.dtx,
%           and the derived files pangram.ins,
%                                 pangram.sty,
%                                 pangram.pdf,
%                             and README.md.
%
%<*internal>
\iffalse
%</internal>
%
%<*readme>
# The `pangram` Package

The `pangram` package aims to provide an easy way for testing fonts.

See `pangram.pdf` for more. Happy TeXing!

## License

This work may be distributed and/or modified under the conditions of 
the [LaTeX Project Public License](http://www.latex-project.org/lppl.txt), 
either version 1.3c of this license or (at your option) any later version.

------

Copyright (C) 2022 by Zhang Tingxuan <alphaztx@163.com>.
%</readme>
%
%<*internal>
\fi
\begingroup
  \def\NameOfLaTeXe{LaTeX2e}
\expandafter\endgroup\ifx\NameOfLaTeXe\fmtname\else
\csname fi\endcsname
%</internal>
%
%<*install>
\input docstrip.tex
\keepsilent

\preamble

  Copyright (C) 2022 by Zhang Tingxuan <alphaztx@163.com>

  This work may be distributed and/or modified under the
  conditions of the LaTeX Project Public License, either
  version 1.3c of this license or (at your option) any later
  version. The latest version of this license is in:

    http://www.latex-project.org/lppl.txt

  and version 1.3 or later is part of all distributions of
  LaTeX version 2005/12/01 or later.
 
  This work has the LPPL maintenance status `maintained'.
 
  The Current Maintainer of this work is Zhang Tingxuan.

  This work consists of the files pangram.dtx,
            and the derived files pangram.ins,
                                  pangram.sty,
                                  pangram.pdf,
                              and README.md.

\endpreamble

\generate{
  \usedir{tex/latex/pangram}
    \file{\jobname.sty}      {\from{\jobname.dtx}{package}}
%</install>
%<*internal>
  \usedir{source/latex/pangram}
    \file{\jobname.ins}      {\from{\jobname.dtx}{install}}
%</internal>
%<*install>
  \usedir{doc/latex/pangram}
  \nopreamble\nopostamble
    \file{README.md}         {\from{\jobname.dtx}{readme}}
}

\obeyspaces
\Msg{****************************************************}
\Msg{*                                                  *}
\Msg{* To finish the installation you have to move the  *}
\Msg{* following file into a directory searched by TeX: *}
\Msg{*                                                  *}
\Msg{*     pangram.sty                                  *}
\Msg{*                                                  *}
\Msg{* The recommended directory is                     *}
\Msg{*   TDS:tex/latex/pangram                          *}
\Msg{*                                                  *}
\Msg{* To produce the documentation run the file        *}
\Msg{* pangram.dtx through XeLaTeX/LuaLaTeX.            *}
\Msg{* XeLaTeX and LuaLaTeX are recommended if you      *}
\Msg{* hope the PDF file to be smaller.                 *}
\Msg{*                                                  *}
\Msg{* Happy TeXing!                                    *}
\Msg{*                                                  *}
\Msg{****************************************************}

\endbatchfile
%</install>
%
%<*internal>
\fi
%</internal>
%
%<*driver>
\ProvidesFile{pangram.dtx}[2022/10/9 (c) Copyright 2022 by Zhang Tingxuan]
\documentclass{ltxdoc}

\usepackage[letterpaper,left=5cm,right=4cm,top=4cm,bottom=4cm,
  includeheadfoot]{geometry}

\usepackage{xcolor}
\definecolor{titlecolor}{RGB}{0,12,160}
\usepackage{doc}
\usepackage{fancyvrb}
\fvset{xleftmargin=2.5em,fontsize=\small,gobble=2}
\MakeShortVerb|

\usepackage{hologo}
\def\XeTeX{\hologo{XeTeX}}
\def\LuaTeX{\hologo{LuaTeX}}

\def\pkg{\textsf}
\def\opt{\texttt}

\title{\leavevmode\hbox to 0pt{\hss\huge The quick brown fox jumps over the lazy dog\hss}\\ 
  --- The \pkg{pangram} package}
\author{Zhang Tingxuan}
\long\date{2022/10/9\quad Version 0.0b\thanks{\url{https://github.com/AlphaZTX/pangram}
If you want to maintain this package, just contact me through GitHub issues or pull a
request.}}

\usepackage{hyperref}
\hypersetup{
  pdftitle   = {The pangram Package},
  pdfauthor  = {Zhang Tingxuan},
  pdfcreator = {XeLaTeX/LuaLaTeX},
  linkcolor  = black,
  urlcolor   = titlecolor!80!black,
}
\def\pkg{\textsf}

\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
  {-2.5ex plus -1ex minus -.2ex}%
  {1ex plus .2ex}%
  {\normalfont\Large\bfseries\color{titlecolor}}}
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
  {-2ex plus -1ex minus -.2ex}%
  {.5ex plus .2ex}%
  {\normalfont\normalsize\bfseries\color{titlecolor}}}
\renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}%
  {.8ex plus .4ex minus .2ex}%
  {-1em}%
  {\normalfont\normalsize\bfseries\color{titlecolor}}}
\makeatother
\usepackage{fontspec}
\setmainfont{Latin Modern Roman}
\setsansfont{Latin Modern Sans}
\setmonofont{Latin Modern Mono}
\usepackage{ragged2e}
\usepackage{pangram}

\linespread{1.05}
\parskip12pt plus 3pt minus 2pt
\parindent2.5em
\RaggedRight

\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
% 
%
% \maketitle
% 
% \begin{abstract}
% Pangram is a phrase or sentence containing all letters in an alphabet, 
% usually  used for testing fonts. One famous pangram is ``The quick brown 
% fox jumps over the lazy dog''. This package provide a (somewhat) simple 
% way for font designers or users to test fonts.
% \end{abstract}
%
% \tableofcontents
%
% \newgeometry{left=1cm,right=1cm,top=1cm,bottom=1cm}
% \pangram[
%   sizes   = {  5pt,  6pt,  7pt,  8pt,  9pt,
%             10pt, 11pt, 12pt, 14pt, 16pt,
%             18pt, 20pt, 22pt, 24pt, 30pt,
%             36pt, 40pt, 44pt, 48pt, 64pt,
%             72pt, 96pt},
%   linegap = 0pt plus 1fil,
%   tagfont = \ttfamily\footnotesize\color{gray},
%   font    = \fontspec{Latin Modern Roman},
%   after   = \thispagestyle{empty},
% ]
% \restoregeometry
%
% \section{How to use this package}
% To load the package, just write
% \begin{Verbatim}
% \usepackage{pangram}
% \end{Verbatim}
% in preamble.
% 
% Then in your document, write
% \begin{Verbatim}
% \pangram
% \end{Verbatim}
% to get the result like the previous page.
%
% Please notice that \cs{pangram} will stay in a seperate page.
% 
% \section{Options}
% The \cs{pangram} command can receive an optional key-val list 
% specifying the details of the pangram page. Here are the keys:
% \begin{itemize}
% \item \opt{textclass} stands for the pangram text in pangram page.
% The default value is \opt{default}, yields ``The quick brown fox 
% jumps over the lazy dog. 0123456789''. \opt{uppercase} and \opt{glass} 
% are also available, which yields ``THE QUICK BROWN FOX JUMPS OVER THE 
% LAZY DOG. 0123456789'' and ``I can eat glass and it doesn't hurt me.'' 
% (although the latter one cannot be regarded as pangram).
% 
% \item \opt{sizes} for the sizes shown in \cs{pangram}. Default value is 
% \texttt{\{5pt, 7pt, 8pt, 9pt, 10pt, 11pt, 12pt, 14pt, 16pt, 18pt, 20pt, 
% 22pt, 24pt, 36pt, 48pt, 60pt, 72pt\}}.
% 
% \item \opt{linegap} is the line skip between two lines in \cs{pangram}. 
% Default value is \opt{5pt plus 3pt minus 2pt}.
% 
% \item \opt{tagskip} is the skip between the tag and the pangram text. 
% Default value is \opt{5pt}.
% 
% \item \opt{tagfont} sets the font of tag. Default value is 
% |\ttfamily\footnotesize|.
% 
% \item \opt{font} sets the font of pangram text. Default value is empty.
% 
% \item \opt{before} stands for the content before pangram text in pangram page.
% Default value is empty.
% 
% \item \opt{after} stands for the content after pangram text in pangram page.
% Default value is empty.
% \end{itemize}
% If you want to set the keys globally, use \cs{PangramSetup} in your preamble, 
% the argument of \cs{PangramSetup} is the same as the one of \cs{pangram}.
% 
% Attention! If any of the value to the keys contains an ``\opt{=}'' symbol, 
% the value should be put into a group. For example,
% \begin{Verbatim}
% \pangram[ font={\fontspec{Latin Modern Roman}[Mapping=tex-text]} ]
% \end{Verbatim}
% 
% \section{New pangram text classes}
% Besides the three pre-defined pangram text classes, you can define your own 
% pangram text classes through \cs{NewPangramClass}:
% 
% \cs{NewPangramClass}\marg{text class}\marg{text}
% 
% \section{A complicated example}
% Set the package globally (used in preamble):
% \begin{Verbatim}
% \PangramSetup{
%   sizes={9bp,10bp,12bp,20bp,36bp,44bp,48bp,64bp},
%   tagfont=\color{gray}\ttfamily\footnotesize,
% }
% \NewPangramClass{abc}{abcdefghijklmnopqrstuvwxyz}
% \end{Verbatim}
% 
% Get the result locally (Needs \pkg{fontspec} package and any package provides 
% \cs{color} command):
% \begin{Verbatim}
% \pangram[font=\fontspec{Latin Modern Roman}]
% \pangram[textclass=glass,
%   font={\fontspec{Latin Modern Sans}[Mapping=tex-text]}]
% \pangram[textclass=abc,font=\fontspec{Latin Modern Mono}]
% \end{Verbatim}
% The text class \opt{abc} here is defined in the previous paragraph.
% 
% \section{The source code}
%    \begin{macrocode}
%<*package>
\NeedsTeXFormat{LaTeX2e}[2022/06/01]
\ProvidesPackage{pangram}[2022/10/09 Pangram, a tool for testing fonts]
%    \end{macrocode}
% Use a \opt{clist} to restore the sizes for \cs{pangram}, 
% and an integer for its index (here we use \opt{index} instead 
% of \opt{int}).
%    \begin{macrocode}
\ExplSyntaxOn
\clist_new:N \l_pangram_sizes_clist
\int_new:N \l_pangram_size_index
\clist_set:Nn \l_pangram_sizes_clist
  { 
    5pt,  7pt,  8pt,  9pt, 10pt, 11pt,
   12pt, 14pt, 16pt, 18pt, 20pt, 22pt,
   24pt, 36pt, 48pt, 60pt, 72pt
  }
%    \end{macrocode}
% Three pre-defined text classes (token lists) for \cs{pangram}.
%    \begin{macrocode}
\tl_const:Nn \c_pangram_text_default_tl
  { The~quick~brown~fox~jumps~over~the~lazy~dog. ~ 0123456789 }
\tl_const:Nn \c_pangram_text_uppercase_tl
  { THE~QUICK~BROWN~FOX~JUMPS~OVER~THE~LAZY~DOG. ~ 0123456789 }
\tl_const:Nn \c_pangram_text_glass_tl
  { I~can~eat~glass~and~it~doesn't~hurt~me. }
%    \end{macrocode}
% \DescribeMacro{\NewPangramClass}
% Use way equivalent to \cs{csname}\dots\cs{endcsname} to define 
% new text classes.
%    \begin{macrocode}
\NewDocumentCommand \NewPangramClass { m m }
  {
    \exp_after:wN \tl_const:Nn \cs:w c_pangram_text_#1_tl \cs_end: { #2 }
  }
%    \end{macrocode}
% Inner function for \opt{sizes} option. Here use the \pkg{xparse}'s new 
% \cs{IfBlankTF} mechanism to judge if the sizes should be reset.
%    \begin{macrocode}
\NewDocumentCommand \pangram_resetsizes:n { m }
  {
    \IfBlankF {#1} { \clist_set:Nn \l_pangram_sizes_clist { #1 } }
  }
%    \end{macrocode}
% The keys.
%    \begin{macrocode}
\keys_define:nn { pangram }
  {
    textclass.tl_set:N  = \l_pangram_textclass_tl ,
    textclass.default:n = default ,
    textclass.initial:n = default ,
    sizes.code:n        = \pangram_resetsizes:n { #1 } ,
    linegap.skip_set:N  = \l_pangram_linegap_skip ,
    linegap.default:n   = 5pt plus 3pt minus 2pt ,
    linegap.initial:n   = 5pt plus 3pt minus 2pt ,
    tagskip.skip_set:N  = \l_pangram_tagskip_skip ,
    tagskip.default:n   = 5pt ,
    tagskip.initial:n   = 5pt ,
    tagfont.tl_set:N    = \l_pangram_tagfont_tl ,
    tagfont.default:n   = \ttfamily \footnotesize ,
    tagfont.initial:n   = \ttfamily \footnotesize ,
    font.tl_set:N       = \l_pangram_font_tl ,
    before.tl_set:N     = \l_pangram_before_tl ,
    after.tl_set:N      = \l_pangram_after_tl ,
  }
%    \end{macrocode}
% \DescribeMacro{\PangramSetup}
% Set up the package in preamble.
%    \begin{macrocode}
\NewDocumentCommand \PangramSetup { m }
  { \keys_set:nn { pangram } { #1 } }
%    \end{macrocode}
% \DescribeMacro{\pangram}
% The function itself.
%    \begin{macrocode}
\NewDocumentCommand \pangram { +O{} }
  {
    \group_begin:
    \keys_set:nn { pangram } { #1 }
    \clearpage
    \skip_set:Nn \parskip { \c_zero_dim }
%    \end{macrocode}
% Use a loop to get all of the entries in the sizes \opt{clist}.
%    \begin{macrocode}
    \int_set:Nn \l_pangram_size_index { 0 }
    \tl_use:N \l_pangram_before_tl
    \int_do_while:nNnn
      { \l_pangram_size_index } < { \clist_count:N \l_pangram_sizes_clist }
      {
        \mode_leave_vertical:
        \int_incr:N \l_pangram_size_index % index++;
        \hbox_to_zero:n
          {
            \hss
            \tl_use:N \l_pangram_tagfont_tl
            \clist_item:Nn \l_pangram_sizes_clist { \l_pangram_size_index }
            \skip_horizontal:N \l_pangram_tagskip_skip
          }
        \hbox_to_zero:n
          {
            \tl_use:N \l_pangram_font_tl
            \fontsize
              { \clist_item:Nn \l_pangram_sizes_clist { \l_pangram_size_index } }
              { \c_zero_dim } % \z@
            \selectfont
            \tl_use:c { c_pangram_text_ \tl_use:N \l_pangram_textclass_tl _tl }
            \hss
          }
        \int_compare:nNnT 
          { \l_pangram_size_index } = { \clist_count:N \l_pangram_sizes_clist }
          { \skip_set:Nn \l_pangram_linegap_skip {0pt} }
        \par
        \skip_vertical:N \l_pangram_linegap_skip
      }
%    \end{macrocode}
% The loop ends here.
%    \begin{macrocode}
    \tl_use:N \l_pangram_after_tl
    \clearpage
    \group_end:
  }
\ExplSyntaxOff
%</package>
%    \end{macrocode}
\endinput