File: fimain.dtx

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% \CheckSum{4033}
% \iffalse meta-comment
%
% Copyright 1993, 1994, 1995, 1996 Alan Jeffrey,
% hacked and maintained 1997, 1998 Sebastian Rahtz,
% copyright 1998, 1999, 2000 the fontinst maintenance team and any 
% individual authors listed elsewhere in this file.  All rights reserved.
% 
% This file is part of the fontinst system version 1.9.
% -----------------------------------------------------
% 
% It may be distributed under the terms of the LaTeX Project Public
% License, as described in lppl.txt in the base LaTeX distribution.
% Either version 1.1 or, at your option, any later version.
% 
%%% From file: fimain.dtx
%
%<*driver>
\documentclass{ltxdoc}
\usepackage{fisource}
\title{The \package{fontinst} utility}
\author{Alan Jeffrey, Sebastian Rahtz, Ulrik Vieth, Lars Hellstr\"om}
\begin{document}
\maketitle
\tableofcontents
\DocInput{fimain.dtx}
\end{document}
%</driver>
% \fi
%
% \StopEventually{}
%
% 
% \section{Encoding files}
% 
% \changes{1.911}{1999/11/21}{Definitions of encoding file commands 
%    added to \protect\protect\protect\Module{misc}. (LH)}
% 
% \DescribeMacro{\inputetx}
% The macro
% \begin{quote}
%    |\inputetx|\marg{filename}
% \end{quote}
% inputs \meta{filename}|.etx|, ignoring anything between |\relax|
% and |\encoding|, and anything after |\endencoding|.
%
% The file name is transformed to lowercase before opening.
%
% \begin{macro}{\inputetx}
% \begin{macro}{\encoding}
%   \changes{1.900}{1999/02/07}
%       {Changed group in fontdoc to \cs{begingroup} type. (LH)}
%   \usechange{raggedright}
% \begin{macro}{\endencoding}
%   \changes{1.900}{1999/02/07}{Made it outer. (LH)}
%   \usechange{raggedright}
%    \begin{macrocode}
%<*pkg|misc>
\def\inputetx#1{
   \edef\lowercase_file{\lowercase{
     \edef\noexpand\lowercase_file{#1}}}
   \lowercase_file
   \slot_number=0
   \def\relax{\let\relax=\x_relax\iffalse}
   \let\encoding=\fi
   \primitiveinput \lowercase_file.etx\x_relax
   \let\relax=\x_relax
}
\let\encoding=\relax
\outer\def\endencoding{\endinput}
%</pkg|misc>
%    \end{macrocode}
%   
%   Things are a bit more complicated in \package{fontdoc}, since the 
%   |\relax| \textellipsis\ |\encoding| \textellipsis\ |\endencoding| 
%   markup must be able to work in two different ways. In the main file 
%   only |\encoding| actually does anything---it sets |\slot@number| to 
%   zero. In a file that is being |\inputetx|ed, they must work as with 
%   \package{fontinst}: Everything between |\relax| and |\encoding|, 
%   and everything after |\endencoding| must be ignored.
%   \multchanges{\cs{inputetx}\cs{inputmtx}}{1.914}{2000/05/27}
%      {New \package{fontdoc} definition, using \cs{IfFileExists}. (LH)}
%   \multchanges{\cs{encoding}\cs{endencoding}}{1.918}{2001/06/19}
%      {Added \cs{par} and \cs{addvspace} to \package{fontdoc} 
%       definitions. (LH)}
%   \multchanges{\cs{endencoding}}{1.919}{2001/09/01}
%      {Added setting of \cs{parindent} to 1\,em to \package{fontdoc} 
%       definition. (LH)}
%    \begin{macrocode}
%<*doc>
\def\inputetx#1{%
   \begingroup
      \edef\lowercase@file{\lowercase{%
         \edef\noexpand\lowercase@file{#1}%
      }}%
      \lowercase@file
      \global\slot@number=0%
      \FD@slot@known@true
      \IfFileExists{\lowercase@file.etx}{%
         \FD@relax@encoding@tricks
         \@@input \@filef@und
         \let\relax=\x@relax
      }{%
         \PackageError{fontdoc}{File #1.etx not found}%
            {\@eha\MessageBreak You can \protect\inputetx\space
             some other file now, if you want.}%
      }
   \endgroup
}
%    \end{macrocode}
%   \begin{macro}{\FD@relax@encoding@tricks}
%     There is a problem with |\if| \dots\ |\fi| nesting in the 
%     redefinition of |\relax| and |\encoding|, which interacts badly 
%     with |\IfFileExists|. To work around that, these redefinitions 
%     are hidden in the |\FD@relax@encoding@tricks| macro.
%     \changes{1.928}{2004/11/24}{Macro added, to fix bug reported by 
%       Peter Dyballa. (LH)}
%    \begin{macrocode}
\def\FD@relax@encoding@tricks{%
   \def\relax{\let\relax=\x@relax\iffalse}%
   \let\encoding=\fi
   \outer\x@cs\def{endencoding}{\endinput}%
}
%    \end{macrocode}
%   \end{macro}
%    \begin{macrocode}
\def\encoding{%
   \par
   \ifFD@spec@ \addvspace{\bigskipamount}\fi
   \begin{flushleft}
   \global\slot@number=\z@
}
\outer\def\endencoding{%
   \end{flushleft}
   \ifFD@spec@ \addvspace{\bigskipamount}\fi
}
%</doc>
%    \end{macrocode}
% \end{macro} \end{macro} \end{macro}
% 
%
% \begin{macro}{\setslot}
%   \changes{1.917}{2001/03/23}{Made slots referencable using 
%      \cs{label}. (LH)}
% \begin{macro}{\endsetslot}
% \begin{macro}{\slot_name}
%   |\setslot|\marg{name} \meta{slot commands} |\endsetslot|
% 
%   In \package{fontinst}, this sets |\slot_name| to \meta{name} and 
%   calls |\do_slot| at the beginning of the slot and it calls 
%   |\end_do_slot| and increments |\slot_number| by one at the end. 
%   By default, |\do_slot| and |\end_do_slot| do nothing, but this is 
%   over-ridden later.
% 
%    \begin{macrocode}
%<*pkg|misc>
\def\setslot#1{\edef\slot_name{#1}\do_slot}
\def\endsetslot{\end_do_slot\advance\slot_number by 1\x_relax}
%</pkg|misc>
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\slot@name}
%   \changes{1.917}{2001/03/23}{Now storing the printable form of the 
%      name, rather than the raw code. (LH)}
%   In \package{fontdoc}, the same code converts \meta{name} to a 
%   printable string and stores the result in |\slot@name|, prints an 
%   |\Aheading| heading for the slot which show the name and number 
%   of the slot, and prints the current automatic slot comment (if 
%   one has been set) at the beginning of the slot. At the end of 
%   the slot, it simply increments |\slot@number| by one.
% 
%    \begin{macrocode}
%<*doc>
\newcommand\setslot[1]{%
   \protected@edef\slot@name{%
      \noexpand\MakePrintable \noexpand\slot@name {FD@swa}{#1}%
   }%
   \slot@name
   \FD@tight@true
   \Aheading{Slot 
      \ifFD@slot@known@
         \the\slot@number\space
      \else
         \(\FD@slot@expression + \the\slot@number\)
      \fi
      `\FD@typeset@string{\slot@name}'%
   }%
   \protected@edef\@currentlabel{%
      \ifFD@slot@known@
         \the\slot@number
      \else
         \protect\(%
         \FD@slot@expression+\the\slot@number
         \protect\)%
      \fi
      \space(\protect\FD@typeset@string{\slot@name})%
   }%
   \ifFD@slot@known@ \ifslot@comment@ \comment{\slot@comment}\fi\fi
}
\def\endsetslot{%
   \global\advance \slot@number \@ne
   \FD@tight@false
}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
%
% \begin{macro}{\do_slot}
% \begin{macro}{\end_do_slot}
%    \begin{macrocode}
%<*pkg|misc>
\let\do_slot\empty_command
\let\end_do_slot\empty_command
%    \end{macrocode}
% \end{macro} \end{macro}
% \multchanges{\cs{do_new_slot}}{1.910}{1999/11/01}{Macro removed. (LH)}
%
% \begin{macro}{\nextslot}
% \begin{macro}{\skipslots}
% \begin{macro}{\slot_number}
% \begin{macro}{\slot@number}
% \begin{switch}{FD@slot@known@}
% \begin{macro}{\FD@slot@expression}
%   |\nextslot|\marg{integer expression}\\
%   |\skipslots|\marg{integer expression}
%
%   In \package{fontinst}, |\nextslot| sets the |\slot_number| and
%   |\skipslots| addvances the |\slot_number|.
%
%    \begin{macrocode}
\newcount\slot_number
\def\nextslot#1{\eval_expr_to\slot_number{#1}}
\def\skipslots#1{\eval_expr{#1} \advance\slot_number by \result}
%</pkg|misc>
%    \end{macrocode}
%   
%   The commands do the same in \package{fontdoc} as in 
%   \package{fontinst}, although they do it to |\slot@number| instead of 
%   |\slot_number|. 
%   
%    \begin{macrocode}
%<*doc>
\newcount\slot@number
\def\FD@slot@known@true{\global\let\ifFD@slot@known@\iftrue}
\def\FD@slot@known@false{\global\let\ifFD@slot@known@\iffalse}
\FD@slot@known@true
\newcommand\nextslot[1]{%
   \FD@evaluate@true
   \FD@eval@expr{#1}%
   \ifFD@evaluate@
      \global\slot@number=\FD@result
      \FD@slot@known@true
   \else
      \global\let\FD@slot@expression=\FD@expression
      \global\slot@number=\z@
      \FD@slot@known@false
   \fi
}
\newcommand\skipslots[1]{%
   \FD@evaluate@true
   \FD@eval@expr{#1}%
   \ifFD@evaluate@
      \global\advance \slot@number \FD@result
   \else
      \ifFD@slot@known@
         \global\let\FD@slot@expression=\FD@expression
      \else
         \protected@xdef\FD@slot@expression{%
            \FD@slot@expression+\FD@expression
         }%
      \fi
      \FD@slot@known@false
   \fi
}
%</doc>
%    \end{macrocode}
%   
%   There has been some ambiguity concerning what is allowed as 
%   arguments of \cs{nextslot} and \cs{skipslots}. At least since 
%   v\,1.335 the comments in the source has said it was an integer 
%   expression, but the implementation was for a \TeX\ number. 
%   Alan's v\,1.5 manual and Rowland's v\,1.8 manual both say the 
%   arguments must be numbers. Allowing arbitrary integer 
%   expressions with \package{fontinst} is trivial, the above 
%   implementation copes with that, but \package{fontdoc} gets in 
%   trouble, so what should we do about it? /LH
%   
%   AFAIK, all instances of |\nextslot| or |\skipslots| appearing in
%   present |*.etx| files are explicit numbers, no fancy constructs. /UV
%   
%   No, but if a |\setslot| command appears in a |\for| loop then the 
%   slot number in that command will depend on the values of various 
%   integer expressions anyway, so we might as well deal with it. /LH
%   
%   The matter was finally resolved when \package{fontdoc} was 
%   augmented to handle (and typeset) arbtrary integer expressions.
%   
%   \multchanges{\cs{nextslot}\cs{skipslots}}{1.900}{1999/02/07}^^A
%      {Made changes of \cs{slot@number} global. (LH)}
% \end{macro}\end{switch}\end{macro}\end{macro}\end{macro}\end{macro}
%
% \begin{macro}{\setleftboundary}
%   \multchanges{\cs{setleftboundary}\cs{endsetleftboundary}}^^A
%      {1.909}{1999/10/19}{\package{fontdoc} definition added. (LH)}
%   \changes{1.917}{2001/03/23}{Made the left boundary referencable 
%      using \cs{label}. (LH)}
% \begin{macro}{\endsetleftboundary}
% \begin{macro}{\do_boundary}
%   |\setleftboundary|\marg{glyph} \meta{slot commands}
%   |\endsetleftboundary|
%   
%   These macros are like |\setslot| and |\endsetslot|, but they merely 
%   set the left boundary ligkern program, they do not cause any 
%   |CHARACTER| property list to be written. Thus the only metric 
%   information connected to the \meta{glyph} argument that is ever used 
%   is the kerns with this glyph on the left.
%   
%   |\do_boundary| and |\endsetleftboundary| are initally |\relax|, but 
%   are later redefined.
%   
%    \begin{macrocode}
%<*pkg>
\def\setleftboundary#1{\edef\slot_name{#1}\do_boundary}
\let\endsetleftboundary\x_relax
\let\do_boundary\x_relax
%</pkg>
%<*doc>
\newcommand\setleftboundary[1]{%
   \protected@edef\slot@name{%
      \noexpand\MakePrintable \noexpand\slot@name {FD@swa}{#1}%
   }%
   \slot@name
   \FD@tight@true
   \Aheading{Left boundary `\FD@typeset@string{\slot@name}'}%
   \protected@edef\@currentlabel{%
      left boundary (\protect\FD@typeset@string{\slot@name})%
   }%
}
\let\endsetleftboundary=\FD@tight@false
%</doc>
%<*misc>
\let\setleftboundary=\gobble_one
\let\endsetleftboundary=\x_relax
%</misc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% 
% 
% \begin{macro}{\setrightboundary}
%   |\setrightboundary|\marg{glyph}
%   
%   The |\setrightboundary| macro should be used to set which slot in 
%   the font is used as right boundary marker if that slot is empty. It 
%   advances |\slot_number| just like a |\setslot| \textellipsis\ 
%   |\endsetslot| pair, but since the slot will be left empty, there is 
%   no need for any \meta{slot commands}, and hence there is no need for 
%   a closing |\endset|\textellipsis\ command either.
%   
%   If the right boundary marker slot is not to be left empty (often 
%   unavoidable), then one should use the slot command 
%   |\makerightboundary| instead.
%   
%   \changes{1.909}{1999/10/19}{doc definition added. (LH)}
%    \begin{macrocode}
%<*pkg|misc>
\def\setrightboundary#1{
   \makerightboundary{#1}
   \advance \slot_number 1\x_relax
}
%</pkg|misc>
%<*doc>
\newcommand\setrightboundary[1]{%
   \Aheading{Right boundary slot
      \ifFD@slot@known@
         \the\slot@number\space
      \else
         \(\FD@slot@expression + \the\slot@number\)
      \fi
      `\TypesetStringExpression{#1}'%
   }%
   \global\advance \slot@number \@ne
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
% 
% \DescribeMacro{\ligature}
% \DescribeMacro{\Ligature}
% \DescribeMacro{\oddligature}
% \DescribeMacro{\nextlarger}
% \DescribeMacro{\varchar}
% \DescribeMacro{\endvarchar}
% \DescribeMacro{\usedas}
% \DescribeMacro{\makerightboundary}
% \DescribeMacro{\Unicode}
% The \meta{slot commands} are:
% \begin{quote}
%   |\ligature|\marg{lig}\marg{glyph}\marg{glyph}\\
%   |\Ligature|\marg{lig}\marg{glyph}\marg{glyph}\\
%   |\oddligature|\marg{note}\marg{lig}\marg{glyph}\marg{glyph}\\
%   |\nextlarger|\marg{glyph}\\
%   |\varchar| \meta{varchar commands} |\endvarchar|\\
%   |\usedas|\marg{command}\marg{type}\\
%   |\makerightboundary|\marg{glyph}\\
%   |\Unicode|\marg{code point}\marg{name}
% \end{quote}
% By default, these do nothing in \package{fontinst}, but most of 
% those defaults are overridden locally in those situations where one 
% wants them to do something. Exceptions are \cs{usedas}, 
% which is never used at all AFAIK,\footnote{It was intended to be 
% used for math font encodings, but that never got off the 
% \texttt{TODO} list. /LH} and |\oddligature| and |\Unicode|, 
% which are purely documentation commands. In \package{fontdoc}, 
% they generate descriptive headings.
% 
% \begin{macro}{\ligature}
% \begin{macro}{\Ligature}
%   \changes{1.917}{2001/03/31}{Command added. (LH)}
% \begin{macro}{\oddligature}
%   \changes{1.918}{2001/05/31}{Command added. (LH)}
%   The |\ligature| and |\Ligature| commands have the same syntax and 
%   meaning to \package{fontinst}, but \package{fontdoc} can give them 
%   slightly different treatment. In a specification ETX file, the 
%   |\Ligature| command gets the heading ``Mandatory ligature'', whereas 
%   the |\ligature| command gets the heading ``Ordinary ligature''.
%   
%   The |\oddligature| command takes a fourth argument which contains a 
%   short note on when the ligature might be appropriate. The entire 
%   command is always ignored by \package{fontinst}.
%    \begin{macrocode}
%<pkg|misc>\let\ligature=\gobble_three
%<pkg|misc>\def\Ligature{\ligature}
%<pkg|misc>\def\oddligature#1#2#3#4{}
%<*doc>
\newcommand\ligature[3]{%
   \Bheading{\ifFD@spec@ Ordinary ligature\else Ligature\fi} 
   \@nameuse{FD@lig-#1}{#2}{#3}%
}
\newcommand\Ligature[3]{%
   \Bheading{\ifFD@spec@ Mandatory ligature\else Ligature\fi} 
   \@nameuse{FD@lig-#1}{#2}{#3}%
}
\newcommand\oddligature[4]{%
   \Bheading{Odd\footnote{#1} ligature} 
   \@nameuse{FD@lig-#2}{#3}{#4}%
}
%    \end{macrocode}
% 
%   Symbolic typesetting of |\ligature| programs requires
%   special processing.\describecsfamily{FD@lig-\meta{lig}}
%   \multchanges{\cs{FD@lig-/LIG\PrintChar{`>}}\cs
%      {FD@lig-LIG/\PrintChar{`>}}\cs{FD@lig-/LIG/\PrintChar{`>}}\cs
%      {FD@lig-/LIG/\PrintChar{`>}\PrintChar{`>}}}{1.917}
%      {2001/03/31}{Changed how \package{fontdoc} marks the current 
%      position after a ligature instruction, from $+$ to 
%      $*\lfloor$. (LH)}
%   \multchanges{\cs{FD@lig-/LIG}}{1.927}
%      {2004/06/21}{Fixed a typo. (LH) Reported by Werner Lemberg.}
%   \multchanges{\cs{FD@lig-/LIG/\PrintChar{`>}\PrintChar{`>}}}{1.927}
%      {2004/06/24}{Fixed a typo. (LH) Reported by Werner Lemberg.}
%
%    \begin{macrocode}
\x@cs\def{FD@lig-LIG}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$\typeset@glyph{#2}%
}
\x@cs\def{FD@lig-/LIG}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#2}%
}
\x@cs\def{FD@lig-LIG/}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \typeset@glyph{#2}${}*{}$\typeset@glyph{#1}%
}
\x@cs\def{FD@lig-/LIG/}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \FD@typeset@string{\slot@name}${}*{}$%
   \typeset@glyph{#2}${}*{}$\typeset@glyph{#1}%
}
\x@cs\def{FD@lig-/LIG>}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \FD@typeset@string{\slot@name}${}*\lfloor$\typeset@glyph{#2}%
}
\x@cs\def{FD@lig-LIG/>}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \typeset@glyph{#2}${}*\lfloor$\typeset@glyph{#1}%
}
\x@cs\def{FD@lig-/LIG/>}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \FD@typeset@string{\slot@name}${}*\lfloor$%
   \typeset@glyph{#2}${}*{}$\typeset@glyph{#1}%
}
\x@cs\def{FD@lig-/LIG/>>}#1#2{%
   \FD@typeset@string{\slot@name}${}*{}$\typeset@glyph{#1}%
   ${}\rightarrow{}$%
   \FD@typeset@string{\slot@name}${}*{}$%
   \typeset@glyph{#2}${}*\lfloor$\typeset@glyph{#1}%
}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
%
% 
% \begin{macro}{\nextlarger}
% \begin{macro}{\usedas}
% \begin{macro}{\makerightboundary}
%    \begin{macrocode}
%<*pkg|misc>
\let\nextlarger=\gobble_one
\let\usedas=\gobble_two
\let\makerightboundary=\gobble_one
%</pkg|misc>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\def\nextlarger#1{\Bheading{Next larger} \typeset@glyph{#1}}
\def\makerightboundary#1{%
   \Bheading{Right boundary marker slot} designation \typeset@glyph{#1}%
}
%</doc>
%    \end{macrocode}
%   \missing{doc}{\usedas}
% \end{macro} \end{macro} \end{macro}
% 
% 
% \begin{macro}{\Unicode}
%   \changes{1.917}{2001/03/13}{Command added. (LH)}
%   \changes{1.917}{2001/03/31}{Added setting of \cs{linepenalty} and 
%   \cs{spaceskip}. (LH)}
% \begin{macro}{\textunicode}
%   \changes{1.918}{2001/06/17}{Command added. (LH)}
% \begin{macro}{\FD@codepoint}
%   \changes{1.918}{2001/06/17}{Macro added. (LH)}
% \begin{macro}{\FD@charname}
%   \changes{1.918}{2001/06/17}{Macro added. (LH)}
%   Since ISO\,10646\slash Unicode has become the primary reference for 
%   identifying characters, we provide a special comment command for 
%   specifying which Unicode character corresponds to a particular slot 
%   in an encoding. \label{Unicode} The syntax is
%   \begin{quote}
%     |\Unicode|\marg{code point}\marg{name}
%   \end{quote}
%   where the \meta{code point} is the four hexadecimal digits that 
%   identify the code point of the character and \meta{name} is the 
%   name of the character. An example is
%   \begin{quote}
%     |\Unicode{0041}{LATIN CAPITAL LETTER A}|
%   \end{quote}
%   which is typeset as
%   \begin{quote}
%     Unicode character \texttt{U+0041}, \textsc{latin capital letter a}.
%   \end{quote}
%   The \meta{name} field may be left empty.
%   
%   The |\Unicode| command makes a whole |\comment|, but it is also 
%   useful to have a similar command for writing such data as part of a 
%   longer paragraph. The |\textunicode| command, which has the same 
%   argument structure as |\Unicode|, is provided for this. If you write
%   \begin{quote}
%     |see also \textunicode{0041}{LATIN CAPITAL LETTER A} for|
%   \end{quote}
%   then this is typeset as
%   \begin{quote}
%     see also \texttt{U+0041} (\textsc{latin capital letter a}) for
%   \end{quote}
%   
%   As case is not significant in the character names and they 
%   furthermore usually seem to be written in capitals, I have chosen 
%   to typeset them using small capitals only. This is done by 
%   |\FD@charname|. The |\FD@codepoint| macro similarly handles 
%   typesetting of code points. See also the \texttt{hypertex} option 
%   to the \package{fontdoc} package.
%   
%   The \package{fontinst} and \package{finstmsc} definitions of 
%   |\Unicode| are to gobble the arguments.
%    \begin{macrocode}
%<pkg|misc>\let\Unicode=\gobble_two
%<*doc>
\newcommand*\Unicode[2]{%
   \comment{%
      \spaceskip=\fontdimen2\font minus 1.1\fontdimen4\font
      Unicode character \FD@codepoint{#1}%
      \ifx \par#2\par \else , \FD@charname{#2}\fi.%
      \linepenalty=300\par
   }%
}
\newcommand*\textunicode[2]{%
   \FD@codepoint{#1} \ifx\par#2\par\else(\FD@charname{#2})\fi
}
\providecommand*\FD@codepoint[1]{\texttt{U+\uppercase{#1}}}
\providecommand*\FD@charname[1]{\textsc{\lowercase{#1}}}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}\end{macro}
% 
% \begin{macro}{\charseq}
%   Most commonly occurring glyphs correspond to one |\Unicode| 
%   character, but this is not at all true in general---in fact there 
%   may even be letters which cannot be encoded as single characters, 
%   as they do not exist in precomposed form but have to be expressed 
%   with a base letter and combining diacritical mark. Reasonable 
%   compliance with the standard requires supporting character 
%   sequences as well as individual characters.
%   \changes{1.928}{2004/11/27}{Command added. (LH)}
%   \changes{1.928}{2004/12/16}{Typeset form changed, from paragraph to 
%      a one-item-per-line list. (LH)}
%   
%   In \package{fontinst}, the |\charseq| command is used to specify 
%   such a character sequence. The syntax is
%   \begin{quote}
%     |\charseq|\marg{\cs{Unicode} commands}
%   \end{quote}
%   where the \meta{\cs{Unicode} commands} is one or several |\Unicode| 
%   commands. This means the sequence of those characters. For example
%   \begin{quote}
%     |\charseq{|\\
%     |   \Unicode{0066}{LATIN SMALL LETTER F}|\\
%     |   \Unicode{0069}{LATIN SMALL LETTER I}|\\
%     |}|
%   \end{quote}
%   is typeset as
%   \begin{quote}
%     Unicode character sequence:\\
%     \vadjust{}\quad\texttt{U+0066} (\textsc{latin small letter f})\\
%     \vadjust{}\quad\texttt{U+0069} (\textsc{latin small letter i})
%   \end{quote}
%   This indentation is made using the \texttt{IfBranch} environment, 
%   which could be considered a bit hackish.
%   
%   |\charseq| is gobbled in \Module{pkg} and \Module{misc}, but in the 
%   latter case it might get redefined.
%    \begin{macrocode}
%<pkg|misc>\let\charseq=\gobble_one
%    \end{macrocode}
%   Note how the environment group restores the definition 
%   of |\Unicode|.
%    \begin{macrocode}
%<*doc>
\newcommand\charseq[1]{%
   \comment{Unicode character sequence:}%
   \begin{IfBranch}%
      \def\Unicode##1##2{%
         \noindent\FD@codepoint{##1} 
         \ifx\par##2\par\else(\FD@charname{##2})\fi
         \par
      }%
      #1%
   \end{IfBranch}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
% 
% \DescribeMacro{\vartop}
% \DescribeMacro{\varmid}
% \DescribeMacro{\varbot}
% \DescribeMacro{\varrep}
% The \meta{varchar commands} are:
% \begin{quote}
%    |\vartop|\marg{glyph}\\
%    |\varmid|\marg{glyph}\\
%    |\varbot|\marg{glyph}\\
%    |\varrep|\marg{glyph}
% \end{quote}
% These too do by default, which is overridden later, nothing in 
% \package{fontinst} but typeset descriptive headings in \package{fontdoc}.
% 
% \begin{macro}{\varchar}
% \begin{macro}{\vartop}
% \begin{macro}{\varmid}
% \begin{macro}{\varbot}
% \begin{macro}{\varrep}
% \begin{macro}{\endvarchar}
%    \begin{macrocode}
%<*pkg|misc>
\let\varchar=\empty_command
\let\vartop=\gobble_one
\let\varmid=\gobble_one
\let\varbot=\gobble_one
\let\varrep=\gobble_one
\let\endvarchar=\empty_command
%</pkg|misc>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\def\varchar{\Bheading{Extensible glyph:}}
\def\vartop#1{\Bheading{Top} \typeset@glyph{#1}}
\def\varmid#1{\Bheading{Middle} \typeset@glyph{#1}}
\def\varbot#1{\Bheading{Bottom} \typeset@glyph{#1}}
\def\varrep#1{\Bheading{Repeated} \typeset@glyph{#1}}
\let\endvarchar\relax
%</doc>
%    \end{macrocode}
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
% 
% 
% \begin{macro}{\useexamplefont}
% \begin{macro}{\slotexample}
% \begin{macro}{\setslotcomment}
% \begin{macro}{\resetslotcomment}
% \begin{macro}{\unsetslotcomment}
% \begin{macro}{\slot@comment}
% \begin{macro}{\slot@font}
%   As of v\,1.8 of \package{fontinst}, we have added an interface
%   for automatic documentation of encoding files, which has been
%   developed by Matthias Clasen as part of his work on math fonts.
%   The implementation was slightly modified and integrated into
%   this version by Ulrik Vieth.
%   
%   |\setslotcomment| defines a default slot comment, stored in the
%   variable |\slot@comment|, which is subsequently used to annotate
%   all |\setslot| commands.  The slot comment can be changed by
%   |\resetslotcomment| or turned off by |\unsetslotcomment|.
%   
%   |\useexamplefont| defines a default font, |\slot@font|, which
%   may be referenced by calling |\slotexample| in slot comments to
%   display the character or symbol allocated to the current slot.
%   
%   Taking advantage of this mechanism, it is possible to write:
%   \begin{quote}
%     |\useexamplefont{FONT}|\\[0.5\baselineskip]
%     |\setslotcomment{The symbol `\slotexample'.}|\\
%     |\setslot{FOO}\endsetslot|\\
%     |\setslot{BAR}\endsetslot|\\
%     |\resetslotcomment{The character `\slotexample'.}|\\
%     |\setslot{BAZ}\endsetslot|
%   \end{quote}
%   instead of having to write:
%   \begin{quote}
%     |\usepackage{PACKAGE-to-use-symbols-from-FONT}|\\[0.5\baselineskip]
%     |\setslot{FOO}\comment{The symbol `\foo'.}\endsetslot|\\
%     |\setslot{BAR}\comment{The symbol `\bar'.}\endsetslot|\\
%     |\setslot{BAZ}\comment{The character `\baz'.}\endsetslot|
%   \end{quote}
%
%   These macros never do anything in \package{fontinst}, they just 
%   gobble their arguments.
%    \begin{macrocode}
%<*pkg|misc>
\let\useexamplefont=\gobble_one
\let\slotexample=\empty_command
\let\setslotcomment=\gobble_one
\let\resetslotcomment=\gobble_one
\let\unsetslotcomment=\empty_command
%</pkg|misc>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newif\ifslot@comment@
\slot@comment@false
\def\slot@comment{}
\newcommand\setslotcomment[1]{%
   \slot@comment@true
   \gdef\slot@comment{#1}%
}
\newcommand\resetslotcomment[1]{\gdef\slot@comment{#1}}
\newcommand\unsetslotcomment{%
   \slot@comment@false
   \global\let\slot@comment\@empty
}
%    \end{macrocode}
%
%    \begin{macrocode}
\let\slot@font=\nullfont
\newcommand\useexamplefont[1]{\font\slot@font=#1 }
\newcommand\slotexample{%
   \ifFD@slot@known@{\slot@font\char\slot@number}\fi
}
%</doc>
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% 
% \begin{macro}{\setfontdimen}
%   \changes{1.917}{2001/03/16}{Command added. (LH)}
%   The |\setfontdimen| command is used in an ETX file to set a font 
%   dimen. The syntax is
%   \begin{quote}
%     |\setfontdimen|\marg{fontdimen no.}\marg{integer}
%   \end{quote}
%   where \meta{fontdimen no.} and \meta{integer} are \emph{string} 
%   expressions. \meta{fontdimen no.} specifies the fontdimen to set. 
%   \meta{integer} is the name of the integer variable to whose value 
%   the fontdimen will be set.
%   
%   When used in font installation, the above |\setfontdimen| command 
%   is equivalent to
%   \changes{1.923}{2002/10/25}{Leave the fontdimen unset when the 
%     integer variable has not been set. (LH)}
%   \begin{quote}
%     |\ifisint|\marg{integer}|\then|\\
%     |   \setint{fontdimen(|\meta{fontdimen no.}|)}{\int{|^^A
%     \meta{integer}|}}|\\
%     |\fi|
%   \end{quote}
%   but |\setfontdimen| is also understood by the (V)PL-to-MTX 
%   converter as declaring an integer that the generated MTX file 
%   should set to the value of the fontdimen in the (V)PL.
%    \begin{macrocode}
%<*pkg>
\def\setfontdimen#1#2{
   \ifisint{#2}\then \setint{fontdimen(#1)}{\int{#2}} \fi
}
%</pkg>
%<misc>\let\setfontdimen\gobble_two
%<*doc>
\newcommand\setfontdimen[2]{%
   \Bheading{Fontdimen} \TypesetStringExpression{#1} is
   \(\TypesetIntegerExpression{\int{#2}}\)%
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\label}
%   \changes{1.917}{2001/03/23}{Macro added. (LH)}
%   \package{fontinst} and \package{finstmsc} defines the \LaTeX\ 
%   |\label| command to gobble its argument, so that one can use it to 
%   reference slots.
%    \begin{macrocode}
%<pkg|misc>\let\label=\gobble_one
%    \end{macrocode}
% \end{macro}
% 
% \begin{switch}{direct}
%   The encoding aspect of a font can to a large extent be understood 
%   as a mapping from the set of slots to the set of glyphs---such 
%   mappings are for example realised by PostScript encoding vectors 
%   (mapping slots to glyph names) and virtual fonts (mapping slots to 
%   DVI commands for drawing a glyph). In some cases however, encodings 
%   are rather used to specify an inverse mapping going the opposite 
%   way. Since encodings are in general many-to-one, this means there 
%   need not be a proper inverse to a given encoding; instead the 
%   inverse image of a glyph is in practice chosen randomly\footnote{In 
%   the sense: according to a very deterministic (but not particularly 
%   useful) rule which depends completely on details in the 
%   implementation, and therefore should not be relied upon anyway.} 
%   among the slots that are mapped to it. This is not always desirable.
%   
%   The \texttt{direct} switch can be used to check whether an encoding 
%   is interpreted in the direct (slots to glyphs) or inverse (glyphs to 
%   slots) manner. If those |\setslot| commands which are undesirable 
%   under the inverse interpretation are put inside an |\ifdirect| 
%   \dots\ |\Fi| construction, then these will be ignored in that 
%   circumstance, thus allowing the programmer to exactly specify both 
%   the direct and the inverse mappings.
%   \changes{1.924}{2003/02/08}{Command added. (LH)}
%   
%   In \package{fontinst}, this command is a switch, which is usually 
%   true.
%    \begin{macrocode}
%<pkg|misc>\newif\ifdirect \directtrue
%    \end{macrocode}
%   In \package{fontdoc}, this is a conditional that will be typeset 
%   if |\showbranches| is being used.
%    \begin{macrocode}
%<doc>\newcommand\ifdirect{\generic@if{direct}}
%    \end{macrocode}
% \end{switch}
% 
% \begin{macro}{\input_mtx_as_etx}
%   The |\input_mtx_as_etx| command is syntactically similar to the 
%   |\inputetx| command, but it inputs an MTX file instead of an ETX 
%   file and redefines |\setscaledrawglyph| so that it expands to a 
%   |\nextslot| followed by a |\setslot| \dots\ |\endsetslot|. This is 
%   useful when making proofs of fonts with nonstandard encodings, as 
%   the MTX of a font can be used to specify ``the default encoding'' 
%   of that font.
%   
%   \textbf{Warning:} Since this macro redefines a lot of the metric 
%   commands, you'll probably only want to call it inside a group.
%   \changes{1.923}{2002/10/24}{Macro added. (LH)}
%    \begin{macrocode}
%<*pkg|misc>
\def\input_mtx_as_etx#1{
   \def\setscaledrawglyph##1##2##3##4##5##6##7##8##9{
      \nextslot{##5}
      \setslot{##1}\endsetslot
   }
   \offcommand\setscalednotglyph
   \let\setglyph=\gobble_glyph
   \offcommand\setkern
   \inputmtx{#1}
}
%</pkg|misc>
%    \end{macrocode}
% \end{macro}
% 
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \section{Metric files}
% \label{Sec:Metric files}
%
% \changes{1.911}{1999/11/17}{Definitions of metric file commands 
%    added to \protect\protect\protect\Module{misc}. (LH)}
% 
% \DescribeMacro{\inputmtx}
% The macro
% \begin{quote}
%    |\inputmtx|\marg{filename}
% \end{quote}
% inputs \meta{filename}|.mtx|, ignoring anything between |\relax| and
% |\metrics|, and anything after |\endmetrics|.
%
% \begin{macro}{\inputmtx}
% \begin{macro}{\metrics}
%   \changes{1.914}{2000/05/26}{Fixed typo: \cs{x@relax} instead of 
%      \cs{x_relax}. (LH)}
%   \usechange{raggedright}
% \begin{macro}{\endmetrics}
%   \changes{1.900}{1999/02/08}{Made it outer. (LH)}
%   \usechange{raggedright}
% \begin{macro}{\endmetrics_text}
% \begin{macro}{\endmetrics@hook}
%   The |\endmetrics_text| macro expands to |\endmetrics| (eleven 
%   `other' tokens, not one control sequence token). It is used instead 
%   of |\string\endmetrics|, which does not work since |\endmetrics| is 
%   outer.
%    \begin{macrocode}
%<*pkg|misc>
\def\inputmtx#1{
   \def\relax{\let\relax=\x_relax\iffalse}
   \let\metrics=\fi
   \primitiveinput #1.mtx\x_relax
   \let\relax=\x_relax
}
\let\metrics=\x_relax
\edef\endmetrics_text{\string\endmetrics}
\outer\def\endmetrics{\endinput}
%</pkg|misc>
%    \end{macrocode}
%   |\inputmtx| used to set |\a_count|, but we haven't been able to 
%   find a reason for this, so it was removed.
%   
%   In \package{fontdoc}, the |\metrics| and |\endmetrics| macros 
%   initially just define a group, but |\inputmtx| redefines them to 
%   work as they do in \package{fontinst}. |\endmetrics@hook| is a 
%   macro that gets executed just before the |\endgroup| in 
%   |\endmetrics|; it is normally |\@empty|, and it is set to this value 
%   at each |\metrics|, but the metric package system redefines it.
%   \multchanges{\cs{endmetrics_hook}}{1.914}{2000/05/27}{Macro added. 
%      (LH)}
%   \multchanges{\cs{inputetx}\cs{inputmtx}}{1.914}{2000/05/27}
%      {New \package{fontdoc} definition, using \cs{IfFileExists}. (LH)}
%    \begin{macrocode}
%<*doc>
\def\inputmtx#1{%
   \begingroup
      \edef\lowercase@file{\lowercase{%
         \edef\noexpand\lowercase@file{#1}%
      }}%
      \lowercase@file
      \let\endmetrics@hook=\@empty
      \IfFileExists{\lowercase@file.mtx}{%
         \skip@mtx@preamble
         \@@input \@filef@und
         \let\relax=\x@relax
      }{%
         \PackageError{fontdoc}{File #1.mtx not found}%
            {\@eha\MessageBreak You can \protect\inputmtx\space
             some other file now, if you want.}%
      }
      \endmetrics@hook
   \endgroup
}
\def\skip@mtx@preamble{%
   \def\relax{\let\relax=\x@relax\iffalse}%
   \let\metrics=\fi
   \outer\x@cs\def{endmetrics}{\endinput}%
}
\def\metrics{%
   \begin{flushleft}%
   \let\endmetrics@hook=\@empty
}
\outer\def\endmetrics{%
   \endmetrics@hook
   \end{flushleft}%
}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}\end{macro}\end{macro}
%
%
% \begin{macro}{\ProvidesMtxPackage}
%   \changes{1.923}{2003/01/05}{Redesigned the headings for metric 
%     packages, since they interact poorly with \cs{section} headings. 
%     (LH)}
% \begin{switch}{@mtxpackage@headed@}
% \begin{macro}{\announce@package}
% \begin{macro}{\finish@package}
%   \multchanges{\cs{ProvidesMtxPackage}\cs{usemtxpackage}}{1.914}
%      {2000/05/27}{New \package{fontdoc} implementation---the packages 
%       are actually loaded (they have to, since they can define 
%       commands). Multiple loading is prevented as in 
%       \package{fontinst}. (LH)}
%   The call
%   \begin{quote}
%     |\ProvidesMtxPackage|\marg{package~name}
%   \end{quote}
%   signals to the package managing system that there is no need to load 
%   this package again.
%    \begin{macrocode}
%<pkg>\def\ProvidesMtxPackage#1{\x_cs\let{pack-#1}P}
%<*doc>
\def\ProvidesMtxPackage#1{%
   \endmetrics@hook
%    \@mtxpackage@headed@false
%    \everypar={
   \announce@package{#1}%
%    }%
   \def\endmetrics@hook{\finish@package{#1}}
   \global\x@cs\let{FD@pack-#1}\@empty
}
%    \end{macrocode}
%    \begin{macrocode}
% \newif\if@mtxpackage@headed@
%    \end{macrocode}
%    \begin{macrocode}
\def\announce@package#1{%
%    \everypar={}%
%    \@mtxpackage@headed@true
   \Aheading{[Start of metric package \textsf{#1}.}%
}
%    \end{macrocode}
%    \begin{macrocode}
\def\finish@package#1{%
%    \if@mtxpackage@headed@
      \Aheading{End of metric package \textsf{#1}.]}%
%    \else
%       \everypar={}%
%       \Aheading{(Metric package \textsf{#1}.)}%
%    \fi
   \par\addvspace\medskipamount
}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{switch}\end{macro}
% 
% 
% \begin{macro}{\usemtxpackage}
%   The call
%   \begin{quote}
%     |\usemtxpackage|\marg{package~list}
%   \end{quote}
%   inputs those of the packages in the list that have not been loaded 
%   yet (i.e., those for which no |\ProvidesMtxPackage| has been made). 
%   Each package is assumed to reside in the metric file that 
%   |\inputmtx| loads when given the name of the package as argument.
%   
%   The call
%   \begin{quote}
%     |\usemtxpackage|\oarg{filename}\marg{package~list}
%   \end{quote}
%   inputs the packages in the list if at least one of them has not been 
%   loaded yet. In this case, all the packages are assumed to reside in 
%   the single metric file that |\inputmtx| loads when given 
%   \meta{filename} as argument.
% 
%    \begin{macrocode}
%<*pkg>
\def\usemtxpackage{\futurelet\next_token\test_UseMtxPkg_arguments}
\def\test_UseMtxPkg_arguments{\ifx\next_token[
      \expandafter\mtx_package_given_file
   \else
      \expandafter\mtx_package_separate_files
   \fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\mtx_package_given_file[#1]#2{
   \_a_false
   \process_csep_list\load_true_unless_loaded #2,\process_csep_list,
   \if_a_ \inputmtx{#1} \fi
}
\def\load_true_unless_loaded#1{
   \x_cs\ifx{pack-#1}P\else\_a_true\fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\mtx_package_separate_files#1{
   \process_csep_list\load_file_unless_loaded #1,\process_csep_list,
}
\def\load_file_unless_loaded#1{
   \x_cs\ifx{pack-#1}P\else \inputmtx{#1} \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\usemtxpackage[2][\x@relax]{%
   \ifx \x@relax#1%
      \@for\@tempa:=#2\do{%
         \x@cs\ifx{FD@pack-\@tempa}\@empty \else 
            \inputmtx{\@tempa}%
         \fi
      }%
   \else
      \@tempswafalse
      \@for\@tempa:=#1\do{%
         \x@cs\ifx{FD@pack-\@tempa}\@empty \else \@tempswatrue \fi
      }%
      \if@tempswa
         \inputmtx{#2}%
      \fi
   \fi
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\glyph_name_modifier}
%   The |\glyph_name_modifier| macro is applied to all glyph names 
%   supplied to commands that are allowed in transformable MTX files 
%   (see Subsection~\ref{Ssec:TransMTX}). The syntax is
%   \begin{quote}
%     |\glyph_name_modifier|\marg{glyph name}
%   \end{quote}
%   and the above must expand fully to a valid glyph name in \TeX's 
%   mouth.
%   
%   \changes{1.923}{2002/10/20}{Macro added. (LH)}
%   The normal definition is to simply expand to the \meta{glyph name}, 
%   i.e., 
%    \begin{macrocode}
%<pkg>\let\glyph_name_modifier=\identity_one
%    \end{macrocode}
%   but the command may expand to any sequence of character tokens. It 
%   was introduced to support (simple) automatic renaming of glyphs 
%   in cases where the |\reglyphfont| command would not be appropriate, 
%   such as when the wanted renaming is simply to add a short suffix to 
%   the glyph names.
%   
%   The reason it only affects the commands allowed in transformable 
%   MTX files is that the macro isn't meant as a generic override for 
%   metric commands.
% \end{macro}
% 
% 
% \subsection{Kerning information}
% 
% The kerning information is kept in the macros 
% \describecsfamily{l-\meta{name}}|\l-|\meta{name} and
% \describecsfamily{r-\meta{name}}|\r-|\meta{name}, containing 
% information about how \meta{name} kerns on the left and on the right, 
% respectively.  The |\l-|\meta{name} macro should expand out to a 
% series of 
% \begin{quote}
%   \DescribeMacro{\k}|\k|\,|\r-|\meta{name}\,|\|\meta{amount}
% \end{quote}
% control sequences, and vice versa. Examples of  
% \describecsfamily{\meta{amount}} |\|\meta{amount}
% control sequences are: |\0|, |\1|, |\1000|, |\-50|, |\33|; these 
% corresponds to the kern amounts $0$, $1$, $1000$ (which would be 
% a very large kern), $-50$, and $33$ respectively.
%
%
% \begin{macro}{\setkern}
% |\setkern|\marg{glyph1}\marg{glyph2}\marg{integer expression}
%
% Sets a kern pair between \meta{glyph1} and \meta{glyph2} to the 
% specified value, which is typically a value returned by 
% |\kerning|\marg{glyph3}\marg{glyph4}. If there already is a kern 
% set between \meta{glyph1} and \meta{glyph2} then this will not affect 
% the output, but it will use up another 3 units of token memory.
%
%    \begin{macrocode}
%<*pkg>
\def\setkern#1#2#3{
   \x_cs\ifx{i-rawscale}\x_relax
      \expandafter\set_kern
         \csname~r-\glyph_name_modifier{#1}\expandafter\endcsname
         \csname~l-\glyph_name_modifier{#2}\endcsname
         {#3}
   \else
      \expandafter\set_kern
         \csname~r-\glyph_name_modifier{#1}\expandafter\endcsname
         \csname~l-\glyph_name_modifier{#2}\endcsname
         {\scale{#3}{\int{rawscale}}}
   \fi
}
\def\set_kern#1#2#3{
   \eval_expr{#3}
   \expandafter\set_kern_cs\csname\the\result\endcsname#1#2
}
\def\set_kern_cs#1#2#3{
   \add_to#2{\k#3#1}
   \add_to#3{\k#2#1}
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\setkern[3]{%
   \Bheading{Kern} \typeset@glyph{#1}${{}+{}}$\typeset@glyph{#2}%
   ${}\rightarrow \TypesetIntegerExpression{#3}$%
}
%</doc>
%<misc>\let\setkern=\gobble_three
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\resetkern}
%   |\resetkern|\marg{glyph1}\marg{glyph2}\marg{integer expression}
%   
%   Resets the kern pair between \meta{glyph1} and \meta{glyph2} to 
%   the specified value. Note however that this does not relieve \TeX\ 
%   of the burden to remember the previous kerning pair between these 
%   two glyphs (if there was one).
% 
%    \begin{macrocode}
%<*pkg>
\def\resetkern#1#2#3{
   \x_cs\ifx{i-rawscale}\x_relax
      \expandafter\reset_kern
         \csname~r-#1\expandafter\endcsname
         \csname~l-#2\endcsname{#3}
   \else
      \expandafter\reset_kern
         \csname~r-#1\expandafter\endcsname
         \csname~l-#2\endcsname{\scale{#3}{\int{rawscale}}}
   \fi
}
\def\reset_kern#1#2#3{
   \eval_expr{#3}
   \expandafter\reset_kern_cs\csname\the\result\endcsname#1#2
}
\def\reset_kern_cs#1#2#3{
   \prep_to#2{\k\expandafter#3\expandafter#1}
   \prep_to#3{\k\expandafter#2\expandafter#1}
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\resetkern[3]{%
   \Bheading{Override kern} \typeset@glyph{#1}${{}+{}}$\typeset@glyph{#2}%
   ${}\rightarrow \TypesetIntegerExpression{#3}$%
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\setleftkerning}
% \begin{macro}{\setrightkerning}
% \begin{macro}{\setleftrightkerning}
% |\setleftkerning|\marg{glyph1}\marg{glyph2}\marg{scaled}\\
% |\setrightkerning|\marg{glyph1}\marg{glyph2}\marg{scaled}\\
% |\setleftrightkerning|\marg{glyph1}\marg{glyph2}\marg{scaled}
%
% Sets left or right kerning of \meta{glyph1} to that of \meta{glyph2}
% scaled by \meta{scaled} (which is an integer expression).  
% |\setleftrightkerning| does both.
%
%    \begin{macrocode}
%<*pkg>
\def\setleftkerning#1#2#3{
   \eval_expr_to\b_count{#3}
   \expandafter\set_kerning
      \csname~l-#1\expandafter\endcsname
      \csname~l-#2\endcsname
}
\def\setrightkerning#1#2#3{
   \eval_expr_to\b_count{#3}
   \expandafter\set_kerning
      \csname~r-#1\expandafter\endcsname
      \csname~r-#2\endcsname
}
\def\setleftrightkerning#1#2#3{
   \eval_expr_to\b_count{#3}
   \expandafter\set_kerning
      \csname~l-#1\expandafter\endcsname
      \csname~l-#2\endcsname
   \expandafter\set_kerning
      \csname~r-#1\expandafter\endcsname
      \csname~r-#2\endcsname
}
\def\set_kerning#1#2{
   \if\b_count=\one_thousand
      \def\k##1##2{
         \set_kern_cs##2##1#1
      }
   \else
      \def\k##1##2{
         \set_kern##1#1{
            \scale\b_count{\expandafter\gobble_one\string##2}
         }
      }
   \fi
   #2
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\setleftkerning[3]{%
   \Bheading{Kern} \typeset@glyph{#1} on the left like 
   \typeset@glyph{#2} \ConditionallyScaled{#3}}
\newcommand\setrightkerning[3]{%
   \Bheading{Kern} \typeset@glyph{#1} on the right like 
   \typeset@glyph{#2} \ConditionallyScaled{#3}}
\newcommand\setleftrightkerning[3]{%
   \Bheading{Kern} \typeset@glyph{#1} on the left and right like 
   \typeset@glyph{#2} \ConditionallyScaled{#3}}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% 
% \begin{macro}{\ConditionallyScaled}
%   \changes{1.916}{2001/01/06}{Command added. (LH)}
%   Several metric commands have take a scaling factor argument which is 
%   rendered by \package{fontdoc} as ``scaled \meta{argument}''. The by 
%   far most common value for this argument is however the constant 
%   number 1000 (no scaling), and in those cases the ``scaled 
%   \textellipsis'' feels a bit long-winded. The cure for this is the 
%   |\Conditionally|\-|Scaled| command, which takes an integer expression 
%   as its argument and typesets the ``scaled \meta{integer expression}'' 
%   \emph{unless} that expression evaluates to 1000, in which case 
%   |\Conditionally|\-|Scaled| simply gobbles any spaces following it.
%    \begin{macrocode}
\newcommand\ConditionallyScaled[1]{%
   \FD@evaluate@true
   \FD@eval@expr{#1}%
   \@tempswatrue
   \ifFD@evaluate@ \ifnum \FD@result=\@m \@tempswafalse \fi\fi
   \FD@evaluate@false
   \if@tempswa scaled \(\FD@expression\)\else \ignorespaces \fi
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% 
% \begin{macro}{\kerning}
%   |\kerning|\marg{glyph1}\marg{glyph2}
%
%   Returns the value of kern pair between \meta{glyph1} and 
%   \meta{glyph2} as an integer.  Returns a value of zero if such a kern 
%   pair doesn't exist.
%
%    \begin{macrocode}
%<*pkg>
\def\kerning#1#2{0\x_relax
   \def\k##1{\csname~set-\string##1\endcsname\gobble_one}
   \bgroup
   \x_cs\def{set-\string\l-#2}##1##2{
      \global\result=\expandafter\gobble_one\string##2\egroup
   }
   \csname~r-#1\endcsname
   \csname~set-\string\l-#2\endcsname\gobble_one{00}
}
%</pkg>
%    \end{macrocode}
%   \changes{1.909}{1999/10/19}{A use of \#1 where it should have 
%      been \#2 was corrected. (LH)}
%    \begin{macrocode}
%<*doc>
\DeclareRobustCommand\kerning[2]{%
   \begingroup
   \MakePrintable\@tempa{FD@swa}{#1}%
   \MakePrintable\@tempb{FD@swa}{#2}%
   \protected@xdef\FD@expression{%
      \mathop{\protect\mathrm{k{}}}(%
      \text{\protect\FD@typeset@string{\@tempa}}%
      ,\penalty\FD@commapenalty
      \text{\protect\FD@typeset@string{\@tempb}}%
      )%
   }%
   \global\chardef\FD@priority=5%
   \global\FD@bracket@level=\@ne
   \FD@evaluate@false
   \endgroup
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifiskern}
%   |\ifiskern|\marg{glyph1}\marg{glyph2}|\then|
%   
%   This command tests if there is a kern pair between \meta{glyph1} and 
%   \meta{glyph2}. It's hard to say if there is a use for it, but it is 
%   included for symmetry.
%
%    \begin{macrocode}
%<*pkg>
\def\ifiskern#1#2\then{
   \def\k##1##2{\ifx T##1 \let\k\gobble_two \fi}
   \bgroup
      \x_cs\let{l-#2}T
      \csname r-#1\endcsname
   \expandafter\egroup \ifx\k\gobble_two
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\def\ifiskern#1#2\then{%
   \generic@if{kern \typeset@glyph{#1}${}+{}$\typeset@glyph{#2} set}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% 
% \begin{macro}{\unsetkerns}
%   |\unsetkerns|\marg{left~glyph~list}\marg{right~glyph~list}
%   
%   This command unsets all kerns with a glyph in the \meta{left~glyph~list} 
%   on the left and a glyph in the \meta{right~glyph~list} on the right. 
%   The lists themselves are ordinary comma-separated lists. Unlike 
%   |\setkern| and |\resetkern|, |\unsetkerns| actually removes the 
%   kerning pairs from \TeX's memory.
%   
%   The implementation itself simply goes through |\r-|\meta{left~glyph} 
%   for each element \meta{left~glyph} in \meta{left~glyph~list} and 
%   |\l-|\meta{right~glyph} for each element \meta{right~glyph} in 
%   \meta{right~glyph~list}, removing each |\k|\meta{token}\meta{token} 
%   tripple that refers to a glyph from the opposite list as it goes 
%   along. To make this test reasonably fast, the routine first ``marks'' 
%   the glyphs in the other list by setting the control sequences 
%   |\slots-|\meta{glyph} to |U| (the letter token U). This mark is 
%   later removed when the |\r-|\meta{glyph} or |\l-|\meta{glyph}
%   respectively control sequences have been gone through; the 
%   |\slots-|\meta{glyph} control sequences are then set to |\relax|.
%   
%    \begin{macrocode}
%<*pkg>
\def\unsetkerns#1#2{
   \let\k\k_unless_to_U
   \process_csep_list\make_slots_U#1,\process_csep_list,
   \def\do##1{\x_cs\main_remove_Us{l-##1}}
   \process_csep_list\do#2,\process_csep_list,
   \process_csep_list\make_slots_relax#1,\process_csep_list,
   \process_csep_list\make_slots_U#2,\process_csep_list,
   \def\do##1{\x_cs\main_remove_Us{r-##1}}
   \process_csep_list\do#1,\process_csep_list,
   \process_csep_list\make_slots_relax#2,\process_csep_list,
}
\def\make_slots_U#1{\x_cs\let{slots-#1}U}
\def\make_slots_relax#1{\x_cs\let{slots-#1}\x_relax}
\def\k_unless_to_U#1#2{
   \x_cs\ifx{slots-\expandafter\gobble_three\string#1}U \else
      \noexpand\k\noexpand#1\noexpand#2
   \fi
}
\def\main_remove_Us#1{
   \ifx#1\x_relax \else
      \edef#1{#1}
      \ifx#1\empty_command \let#1\x_relax \fi
   \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\unsetkerns[2]{%
   \Bheading{Remove} all kerning pairs in 
   \FD@typeset@string@set{#1}${}\times{}$\FD@typeset@string@set{#2}%
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\FD@typeset@string@set}
% \begin{macro}{\FD@typeset@string@set@}
%   \multchanges{\cs{FD@typeset@string@set}^^A
%      \cs{FD@typeset@string@set@}}{1.916}{2001/01/02}{Macros added. 
%      \cs{FD@typeset@string@set} should be used instead of 
%      \cs{print@csep@list} in most occations. (LH)}
%   The |\FD@typeset@string@set| macro takes a comma-separated list of 
%   string expressions as argument and typesets that list as elements of 
%   a set, e.g.
%   \begin{quote}
%     |\FD@typeset@string@set{a,b,\str{c}}|
%   \end{quote}
%   is typeset as
%   \begin{quote}
%     $\{$\texttt{a}$,{}$\texttt{b}$,\mathrm{s}($\texttt{c}$)\}$
%   \end{quote}
%    \begin{macrocode}
\def\FD@typeset@string@set#1{%
   \toks@={}%
   \@for\@tempa:=#1\do{%
      \protected@edef\@tempa{%
         \noexpand\MakePrintable \noexpand\@tempa {FD@swa}{\@tempa}%
      }%
      \@tempa
      \toks@=\expandafter{\the\expandafter\toks@
         \expandafter\do \expandafter{\@tempa}}%
   }%
   \expandafter\FD@typeset@string@set@ \expandafter{\the\toks@}%
}
\def\FD@typeset@string@set@#1{%
   \TypesetList{$\{$}{$,\penalty\FD@commapenalty{}$}%
      {$,\penalty\FD@commapenalty{}$}{$,\penalty\FD@commapenalty{}$}%
      {$\}$}{$\emptyset$}{\FD@typeset@string}{#1}%
}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}
% 
% 
% \begin{macro}{\noleftkerning}
%   \changes{1.906}{1999/07/30}{Macro added. (LH)}
% \begin{macro}{\norightkerning}
%   \changes{1.906}{1999/07/30}{Macro added. (LH)}
% \begin{macro}{\noleftrightkerning}
%   \changes{1.906}{1999/07/30}{Macro added. (LH)}
%   The argument of these commands is the name of a glyph. The commands 
%   removes all kerns on the left, on the right, and on both sides 
%   respectively, of this glyph.
%   
%    \begin{macrocode}
%<*pkg>
\def\noleftkerning#1{\no_kerning{l}{#1}}
\def\norightkerning#1{\no_kerning{r}{#1}}
\def\noleftrightkerning#1{\no_kerning{l}{#1}\no_kerning{r}{#1}}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\noleftkerning[1]{%
   \Bheading{Remove kerns} on the left of glyphs in 
   \FD@typeset@string@set{#1}.}
\newcommand\norightkerning[1]{%
   \Bheading{Remove kerns} on the right of glyphs in 
   \FD@typeset@string@set{#1}.}
\newcommand\noleftrightkerning[1]{%
   \Bheading{Remove kerns} on any side of glyphs in 
   \FD@typeset@string@set{#1}.}
%</doc>
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% 
% \begin{macro}{\no_kerning}
%   \changes{1.906}{1999/07/30}{Macro added. (LH)}^^A
%   \changes{1.906}{1999/08/01}{Macro thoroughly rewritten. (LH)}^^A
%   This macro is called as
%   \begin{quote}
%     |\no_kerning|\marg{side}\marg{glyph list}
%   \end{quote}
%   where \meta{side} is |l| or |r|, and \meta{glyph list} is a 
%   comma-separated list of glyph names. The macro unsets all kerns on 
%   the \meta{side} side of the glyphs in the \meta{glyph list}.
%   
%    \begin{macrocode}
%<*pkg>
\def\no_kerning#1#2{
   \let\k\no_kerning_i
   \def\do##1{\csname #1-##1\endcsname}
   \bgroup
      \aftergroup\def \aftergroup\a_macro \aftergroup{
      \process_csep_list\do #2,\process_csep_list,
      \aftergroup}
   \egroup
   \def\do##1{\expandafter\let \csname #1-##1\endcsname \x_relax}
   \process_csep_list\do #2,\process_csep_list,
   \let\k\no_kerning_ii
   \def\do##1{\edef##1{##1}}
   \a_macro
}
%    \end{macrocode}
%   \begin{macro}{\no_kerning_i}
%     The |\no_kerning_i| macro is used by |\no_kerning| in constructing 
%     a list of all glyphs that a glyph in the \meta{glyph list} has a 
%     \meta{side} kern to, while avoiding repetitions.
%    \begin{macrocode}
\def\no_kerning_i#1#2{
   \ifx #1\x_relax \else
      \aftergroup\do \aftergroup#1
      \let #1\x_relax
   \fi
}
%    \end{macrocode}
%   \end{macro}
%   \begin{macro}{\no_kerning_ii}
%     The |\no_kerning_ii| macro is similar to the |\k_unless_to_U| 
%     macro.
%    \begin{macrocode}
\def\no_kerning_ii#1#2{
   \ifx #1\x_relax \else \noexpand\k \noexpand#1 \noexpand#2 \fi
}
%</pkg>
%    \end{macrocode}
%   \end{macro}
% \end{macro}
% 
% 
% 
% \subsection{Glyph information}
% \label{Ssec:Glyph-info}
% 
% The glyph information is kept in the macros 
% \describecsfamily{g-\meta{name}}|\g-|\meta{name}, which expands 
% out to:
% \begin{quote}
%   \marg{width}\marg{height}\marg{depth}\marg{italic}^^A
%   \marg{mapcommands}\marg{mapfonts}
% \end{quote}
% where the \meta{mapcommands} will write out VPL |MAP| fragments to a
% |.vpl| file, and the \meta{mapfonts} will produce any |MAPFONT| 
% instructions that are needed.
% 
% 
% \begin{macro}{\typeset@glyph}
%   \changes{1.909}{1999/10/20}{Macro added, and most commands that 
%      print a glyph name changed to use this macro. (LH)}
%   \changes{1.916}{2001/01/02}{Macro redefined (made synonymous to 
%      \cs{Typeset\-String\-Expression}). (LH)}
%   The |\typeset@glyph| macro takes a string expression and typesets 
%   that as the name of a glyph. Currently names of glyphs are formatted 
%   precisely the same as any other string expression.
%    \begin{macrocode}
%<doc>\let\typeset@glyph=\TypesetStringExpression
%    \end{macrocode}
% \end{macro}
% 
% 
% \begin{macro}{\width}
% \begin{macro}{\height}
% \begin{macro}{\depth}
% \begin{macro}{\italic}
%   |\width|\marg{glyph}\\
%   |\height|\marg{glyph}\\
%   |\depth|\marg{glyph}\\
%   |\italic|\marg{glyph}
% 
%   In \package{fontinst}, these macros return the width, height, 
%   depth, and italic correction of \meta{glyph} as an integer.
%    \begin{macrocode}
%<*pkg>
\def\width{\glyph_parameter\first_of_six}
\def\height{\glyph_parameter\second_of_six}
\def\depth{\glyph_parameter\third_of_six}
\def\italic{\glyph_parameter\fourth_of_six}
%</pkg>
%    \end{macrocode}
% 
%   In \package{fontdoc}, they print symbolic representations for the 
%   corresponding integer expressions.
%    \begin{macrocode}
%<*doc>
\DeclareRobustCommand\width[1]{\FD@glyph@metric{w}{#1}}
\DeclareRobustCommand\height[1]{\FD@glyph@metric{h}{#1}}
\DeclareRobustCommand\depth[1]{\FD@glyph@metric{d}{#1}}
\DeclareRobustCommand\italic[1]{\FD@glyph@metric{i}{#1}}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% 
% \begin{macro}{\FD@glyph@metric}
%   The |\FD@glyph@metric| macro is a convenient shorthand to use when 
%   defining integer-valued functions which represents some glyph 
%   metric (e.g.\ \cs{height}). Its syntax is
%   \begin{quote}
%     |\FD@glyph@metric|\marg{func-name}\marg{string expression}
%   \end{quote}
%   The \meta{string expression} must be expanded.
%    \begin{macrocode}
\def\FD@glyph@metric#1#2{%
   \begingroup
   \MakePrintable\@tempa{FD@swa}{#2}%
   \protected@xdef\FD@expression{%
      \protect\FD@integer@func{#1}{\@tempa}%
   }%
   \global\chardef\FD@priority=5%
   \global\FD@bracket@level=\@ne
   \FD@evaluate@false
   \endgroup
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
%
% 
% \begin{macro}{\mapcommands}
% \begin{macro}{\mapfonts}
%   These are similar to |\width| and its companions, but they are not 
%   user level commands.
%    \begin{macrocode}
%<*pkg>
\def\mapcommands{\glyph_parameter\fifth_of_six}
\def\mapfonts{\glyph_parameter\sixth_of_six}
%</pkg>
%    \end{macrocode}
% \end{macro}
% \end{macro}
% 
% \begin{macro}{\glyph_parameter}
% \begin{macro}{\first_of_six}
% \begin{macro}{\second_of_six}
% \begin{macro}{\third_of_six}
% \begin{macro}{\fourth_of_six}
% \begin{macro}{\fifth_of_six}
% \begin{macro}{\sixth_of_six}
% \begin{macro}{\glyph_metrics}
%   These macros are used to define |\width| and its friends. 
%   |\glyph_parameter| takes one of the other seven for its first 
%   argument and a glyph name for its second argument. The 
%   |\glyph_metrics| macro can be used if one wants to get all the 
%   metric variables at once.
%    \begin{macrocode}
%<*pkg>
\def\glyph_parameter#1#2{
   \expandafter\expandafter\expandafter
         #1\csname g-#2\endcsname
}
%    \end{macrocode}
%    \begin{macrocode}
\def\first_of_six#1#2#3#4#5#6{#1}
\def\second_of_six#1#2#3#4#5#6{#2}
\def\third_of_six#1#2#3#4#5#6{#3}
\def\fourth_of_six#1#2#3#4#5#6{#4}
\def\fifth_of_six#1#2#3#4#5#6{#5}
\def\sixth_of_six#1#2#3#4#5#6{#6}
%    \end{macrocode}
%    \begin{macrocode}
\def\glyph_metrics#1#2#3#4#5#6{
   \a_count=#1
   \b_count=#2
   \c_count=#3
   \d_count=#4~
}
%    \end{macrocode}
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
% \end{macro} \end{macro} \end{macro}
%
% 
% \begin{macro}{\saved_scale}
% \begin{macro}{\saved_mapfont}
% \begin{macro}{\saved_raw}
% \begin{macro}{\saved_rule}
% \begin{macro}{\saved_special}
% \begin{macro}{\saved_warning}
% \begin{macro}{\saved_movert}
% \begin{macro}{\saved_moveup}
% \begin{macro}{\saved_push}
% \begin{macro}{\saved_pop}
%   These are the commands allowed inside a glyph.  They are initally 
%   set to |\relax|, so we can |\edef| with them safely.
%    \begin{macrocode}
\let\saved_scale\x_relax
\let\saved_mapfont\x_relax
\let\saved_raw\x_relax
\let\saved_rule\x_relax
\let\saved_special\x_relax
\let\saved_warning\x_relax
\let\saved_movert\x_relax
\let\saved_moveup\x_relax
\let\saved_push\x_relax
\let\saved_pop\x_relax
%    \end{macrocode}
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
%
% When the glyph is being constructed by
% \begin{quote}
%    |\setglyph|\marg{glyph} \meta{glyph commands} |\endsetglyph|
% \end{quote}
% the values of each of these parameters are kept in the following
% variables.  Except for |\glyph_width|, these are kept globally,
% so they survive through |\push| \textellipsis\ |\pop| pairs.  In 
% addition, the current vertical offset is kept locally in 
% |\glyph_voffset|. The |\glyph_maxhpos| variable globally keeps track 
% of the largest horizontal offset position reached so far (with the 
% possible exception of the current position, i.e.\ width, which may 
% well be larger).
%
% 
% \begin{macro}{\glyph_width}
% \begin{macro}{\glyph_height}
% \begin{macro}{\glyph_depth}
% \begin{macro}{\glyph_italic}
% \begin{macro}{\glyph_map_commands}
% \begin{macro}{\glyph_map_fonts}
% \begin{macro}{\glyph_voffset}
% \begin{macro}{\glyph_maxhpos}
%   \changes{1.903}{1999/05/20}{Variable added. (LH)}
%    \begin{macrocode}
\newcount\glyph_width
\newcount\glyph_height
\newcount\glyph_depth
\newcount\glyph_italic
\newtoks\glyph_map_commands
\newtoks\glyph_map_fonts
\newcount\glyph_voffset
\newcount\glyph_maxhpos
%    \end{macrocode}
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
% \end{macro} \end{macro} \end{macro}
%
% \begin{macro}{\setglyph}
%   \changes{1.916}{2001/01/06}{Added `set' to \package{fontdoc} text. 
%      (LH)}
% \begin{macro}{\gobble_glyph}
%   The |\setglyph|\marg{name} command defines |\g-|\meta{name}, 
%   unless |\g-|\meta{name} has already been defined.
%   
%   The reason |\g-|\meta{name} is defined before calling |\resetglyph| 
%   is to make it possible to refer to ``the glyph constructed so far'' 
%   using |\width|\marg{name}, |\height|\marg{name}, etc.
%    \begin{macrocode}
\def\setglyph#1{
   \ifisglyph{\glyph_name_modifier{#1}}\then
      \expandafter\gobble_glyph
   \else
      \x_cs\def{g-\glyph_name_modifier{#1}}{
         {\the\glyph_width}{\the\glyph_height}
         {\the\glyph_depth}{\the\glyph_italic}
         {\the\glyph_map_commands}{\the\glyph_map_fonts}
      }
      \resetglyph{\glyph_name_modifier{#1}}
   \fi
}
\long\def\gobble_glyph#1\endsetglyph{}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\setglyph[1]{%
   \FD@tight@true
   \Aheading{Set glyph `\typeset@glyph{#1}'}%
}
%</doc>
%<misc>\long\def\setglyph#1\endsetglyph{}
%    \end{macrocode}
%   
%   LH 2003/01/05: A very useful trick, which unfortunately used to be 
%   undocumented, is to put kerning or variable assignment commands 
%   between |\setglyph| and the corresponding |\endsetglyph|. These 
%   commands will then only be executed if the glyph is being set by 
%   that |\setglyph|. Typical application: If \texttt{Aacutesmall} 
%   is being made by skrinking \texttt{Aacute}, then it is reasonable 
%   to make \texttt{Aacutesmall} kern like \texttt{Aacute} (modulo 
%   some scaling factor). If on the other hand \texttt{Aacutesmall} 
%   has already been set then there is less reason to believe 
%   \texttt{Aacutesmall} should kern like \texttt{Aacute} (a more 
%   probable guess is that it should kern like \texttt{Asmall}).
% \end{macro} \end{macro}
%
% \begin{macro}{\resetglyph}
%   The |\resetglyph|\marg{name} command redefines |\g-|\meta{name}, 
%   regardless of whether |\g-|\meta{name} has already been defined.
%   \changes{1.923}{2002/10/20}{\cs{edef}ing \cs{glyphname}, for 
%      consistency with \cs{setslot}. In principle, this could break 
%      MTX files, but I doubt that it will. (LH)}
%
%    \begin{macrocode}
%<*pkg>
\def\resetglyph#1{
   \edef\glyphname{#1}
   \glyph_width=0
   \global\glyph_height=0
   \global\glyph_depth=0
   \global\glyph_italic=0
   \glyph_voffset=0
   \global\glyph_maxhpos=0
   \global\glyph_map_commands={}
   \global\glyph_map_fonts={}
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\resetglyph[1]{%
   \FD@tight@true
   \Aheading{Reset glyph `\typeset@glyph{#1}'}}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\endsetglyph}
% \begin{macro}{\endresetglyph}
%    \begin{macrocode}
%<*pkg>
\def\endsetglyph{
   \x_cs\edef{g-\glyphname}
      {{\the\glyph_width}{\the\glyph_height}
       {\the\glyph_depth}{\the\glyph_italic}
       {\the\glyph_map_commands}{\the\glyph_map_fonts}}
}
\let\endresetglyph=\endsetglyph
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\let\endsetglyph=\FD@tight@false
\let\endresetglyph=\FD@tight@false
%</doc>
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\setscaledrawglyph}
%   \changes{1.922}{2002/09/07}{Corrected typo: should test whether the 
%      \texttt{rawscale} integer exists, not whether the 
%      \texttt{i-rawscale} integer exists. (LH)}
% \begin{macro}{\setrawglyph}
%   The |\setscaledrawglyph| has the syntax
%   \begin{isyntax}
%     |\setscaledrawglyph|\marg{glyph}\marg{font}\marg{design size}^^A
%       \marg{scale}\penalty0\marg{slot}\penalty0\marg{width}\penalty0
%       \marg{height}\penalty0\marg{depth}\penalty0\marg{italic}
%   \end{isyntax}
%   It is a generalized form of the old |\setrawglyph| command, which 
%   has the syntax
%   \begin{isyntax}
%     |\setrawglyph|\marg{glyph}\marg{font}\marg{design size}^^A
%       \marg{slot}\penalty0\marg{width}\penalty0
%       \marg{height}\penalty0\marg{depth}\penalty0\marg{italic}
%   \end{isyntax}
%   |\setrawglyph| is now syntactic sugar for the equivalent call of
%   |\set|\-|scaled|\-|raw|\-|glyph|.
%    \begin{macrocode}
%<*pkg>
\def\setrawglyph#1#2#3{
   \setscaledrawglyph{#1}{#2}{#3}\one_thousand
}
%    \end{macrocode}
%   
%   These commands are generated automatically, when an |.mtx| file is 
%   written out by |\afmtomtx|, |\pltomtx|, or |\mtxtomtx|.
%   
%   To illustrate the difference between |\setrawglyph| and the new 
%   |\set|\-|scaled|\-|raw|\-|glyph|, note that
%   \begin{quote}
%     |\setscaledrawglyph{fscaled}{xfont}{10pt}{800}{102}%|\\
%     |   {300}{600}{300}{40}|
%   \end{quote}
%   produces the same \texttt{fscaled} glyph as
%   \begin{quote}
%     |\setrawglyph{f}{xfont}{10pt}{102}{375}{750}{375}{50}|\\
%     |\setglyph{fscaled}  \glyph{f}{800}  \endsetglyph|
%   \end{quote}
%   
%    \begin{macrocode}
\def\setscaledrawglyph#1#2#3#4#5#6#7#8#9{
   \if_undefined{g-\glyph_name_modifier{#1}}\then
      \eval_expr{#4}
      \ifnum \result=\one_thousand
         \let\a_macro\identity_one
      \else
         \edef\a_macro##1{\saved_scale{\the\result}{##1}}
      \fi
      \eval_expr_to\a_count{#6}
      \eval_expr_to\b_count{#7}
      \eval_expr_to\c_count{#8}
      \eval_expr_to\d_count{#9}
      \ifisint{rawscale}\then
         \e_count=\int{rawscale}
         \multiply \a_count \e_count  \l_rounded_thousandths\a_count
         \multiply \b_count \e_count  \l_rounded_thousandths\b_count
         \multiply \c_count \e_count  \l_rounded_thousandths\c_count
         \multiply \d_count \e_count  \l_rounded_thousandths\d_count
         \edef\a_macro##1{\saved_scale{\the\e_count}{\a_macro{##1}}}
      \fi
      \x_cs\edef{g-\glyph_name_modifier{#1}}{
         {\the\a_count}
         {\the\b_count}
         {\the\c_count}
         {\the\d_count}
         {\a_macro{\saved_raw{#2}{#5}{#1}}}
         {\a_macro{\saved_mapfont{#2}{#3}}}
      }
   \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\setrawglyph[8]{%
   \Aheading{Glyph `\typeset@glyph{#1}'}
   \Bheading{Taken from} slot $\TypesetIntegerExpression{#4}$ in 
   font \TypesetStringExpression{#2}%
}
\newcommand\setscaledrawglyph[9]{%
   \Aheading{Glyph `\typeset@glyph{#1}'}
   \Bheading{Taken from} slot $\TypesetIntegerExpression{#5}$ in 
   font \TypesetStringExpression{#2} \ConditionallyScaled{#4}%
}
%</doc>
%<misc>\def\setrawglyph#1#2#3#4#5#6#7#8{}
%<misc>\def\setscaledrawglyph#1#2#3#4#5#6#7#8#9{}
%    \end{macrocode}
% \end{macro}\end{macro}
%
% \begin{macro}{\setscalednotglyph}
%   \changes{1.917}{2001/03/13}{This macro should set 
%      \cs{g-\meta{glyph}-not}, not \cs{g-\meta{glyph}}. (LH)}
%   \changes{1.922}{2002/09/07}{Corrected typo: should test whether 
%      the \texttt{rawscale} integer exists, not whether the 
%      \texttt{i-rawscale} integer exists. (LH)}
% \begin{macro}{\setnotglyph}
%   The |\setscalednotglyph| command has the same syntax as the 
%   |\set|\-|scaled|\-|raw|\-|glyph| command, i.e.,
%   \begin{isyntax}
%     |\setscalednotglyph|\marg{glyph}\marg{font}\marg{design size}^^A
%       \marg{scale}\penalty0\marg{slot}\penalty0\marg{width}\penalty0
%       \marg{height}\penalty0\marg{depth}\penalty0\marg{italic}
%   \end{isyntax}
%   It is a generalized form of the old |\setnotglyph| command, which 
%   has the syntax
%   \begin{isyntax}
%     |\setnotglyph|\marg{glyph}\marg{font}\marg{design size}^^A
%       \marg{slot}\penalty0\marg{width}\penalty0\marg{height}\penalty0
%       \marg{depth}\penalty0\marg{italic}
%   \end{isyntax}
%   |\setnotglyph| is now syntactic sugar for the equivalent call of
%   |\set|\-|scaled|\-|not|\-|glyph|.
%    \begin{macrocode}
%<*pkg>
\def\setnotglyph#1#2#3{
   \setscalednotglyph{#1}{#2}{#3}\one_thousand
}
%    \end{macrocode}
%   
%   Note that only the \meta{glyph}, \meta{width}, \meta{height}, 
%   \meta{depth}, and \meta{italic} parameters are used. The reason for 
%   having the other parameters is that |\set|\-|scaled|\-|not|\-^^A
%   |glyph| commands can be converted to |\set|\-|scaled|\-|raw|\-^^A
%   |glyph| commands when a font is reencoded. Therefore all the 
%   information must be present, even if it is not used by the main 
%   definition.
%   
%   To think about (LH 2000/03/02): Perhaps the \meta{mapcommands} field 
%   of a \texttt{-not}-glyph should contain a |\glyphwarning|, just in 
%   case anyone tries to use one?
%    \begin{macrocode}
\def\setscalednotglyph#1#2#3#4#5#6#7#8#9{
   \if_undefined{g-\glyph_name_modifier{#1}-not}\then
      \eval_expr_to\a_count{#6}
      \eval_expr_to\b_count{#7}
      \eval_expr_to\c_count{#8}
      \eval_expr_to\d_count{#9}
      \ifisint{rawscale}\then
         \e_count=\int{rawscale}
         \multiply \a_count \e_count  \l_rounded_thousandths\a_count
         \multiply \b_count \e_count  \l_rounded_thousandths\b_count
         \multiply \c_count \e_count  \l_rounded_thousandths\c_count
         \multiply \d_count \e_count  \l_rounded_thousandths\d_count
      \fi
      \x_cs\edef{g-\glyph_name_modifier{#1}-not}{
         {\the\a_count}
         {\the\b_count}
         {\the\c_count}
         {\the\d_count}
         {}{}
      }
   \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\setnotglyph[8]{%
   \Aheading{Pseudoglyph `\typeset@glyph{#1-not}'}%
}
\newcommand\setscalednotglyph[9]{%
  \setnotglyph{#1}{#2}{#3}{#5}{#6}{#7}{#8}{#9}%
}
%</doc>
%<misc>\let\setnotglyph=\setrawglyph
%<misc>\let\setscalednotglyph=\setscaledrawglyph
%    \end{macrocode}
% \end{macro}\end{macro}
%
% \begin{macro}{\unsetglyph}
%   The |\unsetglyph|\marg{name} command makes |\g-|\meta{name} 
%   undefined.
%
%    \begin{macrocode}
%<pkg>\def\unsetglyph#1{\x_cs\let{g-#1}\x_relax}
%<doc>\newcommand\unsetglyph[1]{%
%<doc>   \Aheading{Unset glyph `\typeset@glyph{#1}'}}
%    \end{macrocode}
% \end{macro}
%
%
% \subsection{Glyph commands}
%
% The \meta{glyph commands} are:
% \changes{1.908}{1999/08/22}{Glyph commands avoid \cs{edef}ing old 
%    contents of \cs{glyph_map_commands} and \cs{glyph_map_fonts}. (LH)}
% \begin{macro}{\glyph}
%   |\glyph|\marg{glyph}\marg{scale}
%   \changes{1.900}{1999/02/08}{Avoids scaling by 1000. (LH)}
%
%    \begin{macrocode}
%<*pkg>
\def\glyph#1#2{
   \glyph_parameter\glyph_metrics{#1}
   \eval_expr_to\e_count{#2}
   \ifnum \e_count=\one_thousand
      \edef\a_macro{\mapcommands{#1}}
      \global\glyph_map_commands\expandafter{
         \the\expandafter\glyph_map_commands \a_macro
      }
      \edef\a_macro{\mapfonts{#1}}
   \else
      \multiply \a_count \e_count  \l_rounded_thousandths\a_count
      \multiply \b_count \e_count  \l_rounded_thousandths\b_count
      \multiply \c_count \e_count  \l_rounded_thousandths\c_count
      \multiply \d_count \e_count  \l_rounded_thousandths\d_count
      \edef\a_macro{\saved_scale{\the\e_count}{\mapcommands{#1}}}
      \global\glyph_map_commands\expandafter{
         \the\expandafter\glyph_map_commands \a_macro
      }
      \edef\a_macro{\saved_scale{\the\e_count}{\mapfonts{#1}}}
   \fi
   \advance \glyph_width \a_count
   \advance \b_count \glyph_voffset
   \ifnum \glyph_height<\b_count \global\glyph_height=\b_count \fi
   \advance \c_count -\glyph_voffset
   \ifnum \glyph_depth<\c_count \global\glyph_depth=\c_count \fi
   \global\glyph_italic=\d_count
   \global\glyph_map_fonts\expandafter{
      \the\expandafter\glyph_map_fonts \a_macro
   }
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\glyph[2]{%
   \Bheading{Glyph} `\typeset@glyph{#1}' \ConditionallyScaled{#2}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\glyphrule}
%   |\glyphrule|\marg{width}\marg{height}
%
%    \begin{macrocode}
%<*pkg>
\def\glyphrule#1#2{
   \eval_expr_to\b_count{#1} \eval_expr_to\c_count{#2}
   \advance\glyph_width by \b_count
   \g_eval_expr_to\glyph_depth{\max\glyph_depth{-\glyph_voffset}}
   \g_eval_expr_to\glyph_height{
      \max\glyph_height{\add\glyph_voffset\c_count}
   }
   \global\glyph_italic=0
   \edef\a_macro{\saved_rule{\the\b_count}{\the\c_count}}
   \global\glyph_map_commands\expandafter{
      \the\expandafter\glyph_map_commands \a_macro
   }
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\glyphrule[2]{%
   \Bheading{Rule} $\TypesetIntegerExpression{#1}$ by
   $\TypesetIntegerExpression{#2}$%
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\glyphspecial}
% \begin{macro}{\glyphwarning}
%   |\glyphspecial|\marg{string}\\
%   |\glyphwarning|\marg{string}
%
%    \begin{macrocode}
%<*pkg>
\def\glyphspecial#1{
   \edef\a_macro{\saved_special{#1}}
   \global\glyph_map_commands\expandafter{
      \the\expandafter\glyph_map_commands \a_macro
   }
}
\def\glyphwarning#1{
   \edef\a_macro{\saved_warning{#1}}
   \global\glyph_map_commands\expandafter{
      \the\expandafter\glyph_map_commands \a_macro
   }
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\glyphspecial[1]{%
   \Bheading{Special} `\TypesetStringExpression{#1}'}
\newcommand\glyphwarning[1]{%
   \Bheading{Warning} `\TypesetStringExpression{#1}'}
%</doc>
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\movert}
%   \changes{1.903}{1999/05/20}{Added update of \cs{glyph_maxhpos}. (LH)}
% \begin{macro}{\moveup}
%   |\movert|\marg{xoffset}\\
%   |\moveup|\marg{yoffset}
%
%    \begin{macrocode}
%<*pkg>
\def\movert#1{
   \eval_expr{#1}
   \ifnum \glyph_maxhpos<\glyph_width
      \global\glyph_maxhpos\glyph_width
   \fi
   \ifnum 0=\result \else
      \advance\glyph_width by \result
      \edef\a_macro{\saved_movert{\the\result}}
      \global\glyph_map_commands\expandafter{
         \the\expandafter\glyph_map_commands \a_macro
      }
   \fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\moveup#1{
   \eval_expr{#1}
   \ifnum\result=0\else
      \advance\glyph_voffset by \result
      \edef\a_macro{\saved_moveup{\the\result}}
      \global\glyph_map_commands\expandafter{
         \the\expandafter\glyph_map_commands \a_macro
      }
   \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\movert[1]{\Bheading{Rt}~$\TypesetIntegerExpression{#1}$}
\newcommand\moveup[1]{\Bheading{Up}~$\TypesetIntegerExpression{#1}$}
%</doc>
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\push}
%   \changes{1.907}{1999/08/02}{Removed the \cs{edef}. (LH)}
% \begin{macro}{\pop}
%   \changes{1.903}{1999/05/20}{Added update of \cs{glyph_maxhpos}. (LH)}
%   \changes{1.907}{1999/08/02}{Removed the \cs{edef}. (LH)}
%    \begin{macrocode}
%<*pkg>
\def\push{
   \bgroup
   \global\glyph_map_commands\expandafter{
      \the\glyph_map_commands \saved_push
   }
}
%    \end{macrocode}
%    \begin{macrocode}
\def\pop{
   \ifnum \glyph_maxhpos<\glyph_width
      \global\glyph_maxhpos\glyph_width
   \fi
   \egroup
   \global\glyph_map_commands\expandafter{
      \the\glyph_map_commands \saved_pop
   }
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\push{\Bheading{Push}}
\newcommand\pop{\Bheading{Pop}}
%</doc>
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\resetwidth}
% \begin{macro}{\resetheight}
% \begin{macro}{\resetdepth}
% \begin{macro}{\resetitalic}
%   |\resetwidth|\marg{width}\\
%   |\resetheight|\marg{height}\\
%   |\resetdepth|\marg{depth}\\
%   |\resetitalic|\marg{italic}
%
%    \begin{macrocode}
%<*pkg>
\def\resetwidth#1{\movert{\sub{#1}\glyph_width}}
\def\resetheight{\g_eval_expr_to\glyph_height}
\def\resetdepth{\g_eval_expr_to\glyph_depth}
\def\resetitalic{\g_eval_expr_to\glyph_italic}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\resetwidth[1]{%
   \Bheading{Reset width to $\TypesetIntegerExpression{#1}$}%
}
\newcommand\resetheight[1]{%
   \Bheading{Reset height to $\TypesetIntegerExpression{#1}$}%
}
\newcommand\resetdepth[1]{%
   \Bheading{Reset depth to $\TypesetIntegerExpression{#1}$}%
}
\newcommand\resetitalic[1]{%
   \Bheading{Reset italic to $\TypesetIntegerExpression{#1}$}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\glyphpcc}
%   Some syntactic sugar: |\glyphpcc| could do with optimization.
%   \begin{quote}
%     |\glyphpcc|\marg{glyph}\marg{xoffset}\marg{yoffset}
%   \end{quote}
%   \changes{1.925}{2003/05/28}{Added check that the glyph used is 
%     defined; we get an ugly error if it isn't. (LH)}
%   
%    \begin{macrocode}
%<*pkg>
\def\glyphpcc#1#2#3{
   \ifisglyph{\glyph_name_modifier{#1}}\then
      \push
         \movert{#2}
         \moveup{#3}
         \glyph{\glyph_name_modifier{#1}}{\one_thousand}
      \pop
   \else
      \fontinsterror{\string\glyphpcc}{
          Base~glyph~not~set.\messagebreak 
          This~could~be~a~sign~that~the~AFM~file~is~buggy
      }\error_help_a
   \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\def\glyphpcc#1#2#3{
   \push
      \movert{#2}
      \moveup{#3}
      \glyph{#1}{1000}
   \pop
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\glyphbboxright}
%   \changes{1.903}{1999/05/20}{Macro added. (LH)}
%   The |\glyphbboxright| command is a valid integer expression, but 
%   its value is only meaningful inside a |\setglyph| \textellipsis\ 
%   |\endsetglyph| or |\resetglyph| \textellipsis\ |\endresetglyph| 
%   structure. There its value is almost the horizontal position of 
%   the right edge of the bounding box for the glyph constructed so 
%   far---in reality it is the greatest horizontal offset reached so 
%   far.
%   
%    \begin{macrocode}
%<pkg>\def\glyphbboxright{\max\glyph_width\glyph_maxhpos}
%<*doc>
\DeclareRobustCommand\glyphbboxright{%
   \gdef\FD@expression{\protect\mathrm{glyphbboxright}}
   \global\chardef\FD@priority=\tw@
   \global\FD@bracket@level=\z@
   \FD@evaluate@false
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\samesize}
%   \changes{1.903}{1999/05/20}{Added behaviour for nonexistent glyph 
%      (based on a suggestion from Hilmar Schlegel) and fixed typo in 
%      \package{fontdoc}. (LH)}
%   |\samesize|\marg{glyph}
%
%    \begin{macrocode}
%<*pkg>
\def\samesize#1{
   \if_undefined{g-\glyph_name_modifier{#1}}\then
      \resetwidth{\glyphbboxright}
   \else
      \expandafter\expandafter\expandafter
         \same_size\csname g-\glyph_name_modifier{#1}\endcsname
   \fi
}
\def\same_size#1#2#3#4#5#6{
   \movert{\sub{#1}\glyph_width}
   \global\glyph_height=#2
   \global\glyph_depth=#3
   \global\glyph_italic=#4
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\newcommand\samesize[1]{%
   \Bheading{Reset dimensions to those of `\typeset@glyph{#1}'.}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifisglyph}
%   The control flow command:
%   \changes{1.923}{2002/10/20}{Using \cs{if_defined}. (LH)}
%    \begin{macrocode}
%<pkg>\def\ifisglyph#1\then{\if_defined{g-#1}\then}
%    \end{macrocode}
%   \changes{1.911}{1999/11/30}{\protect\protect\protect\Module{misc} 
%      definition added. (LH)}
%   |\ifisglyph| evaluates to false in \Module{misc}, since this avoids 
%   uses of various metric integer expressions (such as |\width|, 
%   |\height|, etc.) that are not defined there.
%    \begin{macrocode}
%<doc>\def\ifisglyph#1\then{\generic@if{glyph \typeset@glyph{#1} set}}
%<misc>\def\ifisglyph#1\then{\iffalse}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\ifareglyphs}
%   \changes{1.917}{2001/03/17}{Macro added. (LH)}
%   The |\ifareglyphs| command test if all glyphs in a comma-separeted 
%   list of glyphs are set. The syntax is
%   \begin{quote}
%     |\ifareglyphs|\marg{glyph list}|\then|
%   \end{quote}
%   The implementation relies on that |\if_true| and |\if_false| do not 
%   count when \TeX\ is skipping text that is balanced with respect to 
%   |\if|s and |\fi|s.
%    \begin{macrocode}
%<*pkg>
\def\ifareglyphs#1\then{
   \process_csep_list{\if_is_glyph}#1,\process_csep_list,
   \if_true
}
\def\if_is_glyph#1{
   \if_undefined{g-#1}\then \expandafter\if_false \fi
}
%</pkg>
%<misc>\let\ifareglyphs=\ifisglyph
%<*doc>
\def\ifareglyphs#1\then{%
   \generic@if{all glyphs in \FD@typeset@string@set{#1} are set}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
%
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \section{Converting an ETX file to a (V)PL file}
%
% \subsection{Lowest-level user interface}
% 
% \DescribeMacro{\etxtovpl}
% The macro:
% \begin{quote}
%    |\etxtovpl|\marg{encoding list}\marg{vplfile}
% \end{quote}
% writes a virtual font (as a virtual property list) with the 
% encoding specified by the items in the \meta{encoding list}, 
% which typically are names of ETX files.  
% (This macro is called by |\installfont|.)
%
% \DescribeMacro{\etxtopl}
% The macro:
% \begin{quote}
%    |\etxtopl|\marg{encoding list}\marg{plfile}
% \end{quote}
% writes a font (as a property list) with the encoding 
% specified by the items in the \meta{encoding list}, 
% which typically are names of ETX files.  
% (This macro is called by |\installrawfont|.)
% 
% \multchanges{\cs{etxtovpl}\cs{etxtopl}}{1.923}{2002/10/24}{The 
%   first argument of these macros is now a comma-separated list 
%   of ETX files, and the items may be subjected to modifier 
%   clauses. (LH)}
% 
% \begin{macro}{\etxtovpl}
%   \changes{1.923}{2002/10/25}{The program is called \texttt{vptovf}, 
%      not \texttt{vpltovf}. (LH)}
% \begin{macro}{\etxtopl}
%    \begin{macrocode}
%<*pkg>
\def\etxtovpl#1#2{{
   \def\vpl_extension{vpl}
   \def\vpl_title{COMMENT}
   \def\vpl_font{virtual~font}
   \def\vpl_Font{Virtual~font}
   \def\vpl_call{\string\etxtovpl{#1}{#2}}
   \def\vpl_to_vf##1{vptovf~##1.vpl~##1.vf~##1.tfm}
   \a_toks={}
   \process_csep_list\make_inputetx #1,\process_csep_list,
   \expandafter\etx_to_font \expandafter{\the\a_toks}{#2}
}}
\def\etxtopl#1#2{{
   \def\vpl_extension{pl}
   \def\vpl_title{COMMENT}
   \def\vpl_font{font}
   \def\vpl_Font{Font}
   \def\vpl_call{\string\etxtopl{#1}{#2}}
   \def\vpl_to_vf##1{pltotf~##1.pl~##1.tfm}
   \_including_map_false
   \global\rawfont_scaling=-\p@
   \a_toks={}
   \process_csep_list\make_inputetx #1,\process_csep_list,
   \expandafter\etx_to_font \expandafter{\the\a_toks}{#2}
}}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% 
% \begin{switch}{_including_map_}
%   \changes{1.900}{1998/10/02}{New switch that can inhibit writing of 
%      VPL-specific properties. (LH)}
%   The v\,1.5 method of controlling whether \texttt{MAP} and 
%   \texttt{MAPFONT} properties should be written requires that some 
%   code is put in an awkward place (in |\make_mapfonts| rather than 
%   |\make_characters|). As the code was being reorganised anyway, it 
%   seemed best to let a switch control this instead. If 
%   |\if_including_map_| is true, \texttt{MAP} and \texttt{MAPFONT} 
%   properties are written to the file (which should be a VPL), if it is 
%   false then they are not written to the file (which is then a normal 
%   PL).
%    \begin{macrocode}
\newif\if_including_map_
\_including_map_true
%    \end{macrocode}
% \end{switch}
%
% \begin{macro}{\make_inputetx}
%   The |\make_inputetx| macro takes a single argument that should have 
%   the form
%   \begin{quote}
%     \meta{file name root}\meta{optional modifiers}
%   \end{quote}
%   as explained in the comments to |\input_mtx_file|. The effect of 
%   this macro is to append some commands (usually 
%   |\inputetx|\marg{file name root}) to |\a_toks|. This may however 
%   change if some clause in the \meta{optional modifiers} redefines 
%   |\a_macro|.
%   \changes{1.923}{2002/10/24}{Macro added. (LH)}
%    \begin{macrocode}
\def\make_inputetx#1{
   \def\a_macro{\noexpand\inputetx{\file_name}}
   \get_file_name #1~{}~\par
   \edef\a_macro{\a_macro}
   \a_toks=\expandafter{ \the\expandafter\a_toks \a_macro}
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\IFKW-mtxasetx}
%   The \texttt{mtxasetx} modifier clause causes the \meta{encoding 
%   list} item in question to be input using |\input_mtx_as_etx| rather 
%   than |\inputetx|. This makes it possible to use the |\setrawglyph| 
%   and |\setscaledrawglyph| commands in an MTX file as a poor 
%   substitute for a proper ETX file. This is sometimes useful for 
%   making proofs.
%   \changes{1.923}{2002/10/24}{Macro added. (LH)}
%    \begin{macrocode}
\x_cs\def{IFKW-mtxasetx}{
   \def\a_macro{\noexpand\input_mtx_as_etx{\file_name}}
   \get_keyword
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \begin{macro}{\etx_to_font}
%   |\etx_to_font|\marg{encoding commands}\marg{fontfile} makes 
%   a (V)PL file whose encoding is specified by the \meta{encoding 
%   commands}. These are usually just one or a few |\inputetx| 
%   commands, as the specification of an encoding usually requires much 
%   more code than is convenient to provide as an argument.
%   \changes{1.923}{2002/10/24}{Made the first argument a list of 
%      commands. Renamed \cs{vpl_caller} to \cs{vpl_call}; it is now 
%      assumed to contain the arguments as well. (LH)}
%    \begin{macrocode}
\def\etx_to_font#1#2{
   \make_assignments{#1}
   \open_out{#2.\vpl_extension}
   \top_of_pl_hook
   \out_line{(\vpl_title\space\vpl_font\space
      #2~created~by~fontinst~v\fontinstversion)}
   \out_line{}
   \out_line{(COMMENT~Filename:~#2.\vpl_extension)}
   \out_line{(COMMENT~Created~by:~tex~\jobname)}
   \out_line{(COMMENT~Created~using:~\vpl_call)}
   \out_line{}
   \out_line{(COMMENT~This~file~can~be~turned~into~a~\vpl_font\space 
      with)}
   \out_line{(COMMENT~\vpl_to_vf{#2})}
   \out_line{}
   \out_line{(COMMENT~THIS~FILE~CAN~THEN~BE~DELETED.)}
   \out_line{}
   \make_header{#1}
   \if_including_map_ \make_mapfonts{#1} \fi
   \make_fontdimens{#1}
   \make_ligtable{#1}
   \make_characters{#1}
   \make_tidy{#1}
   \out_line{}
   \out_line{(COMMENT~END~OF~FILE~#2.\vpl_extension)}
   \close_out{\vpl_Font}
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \begin{macro}{\pre_first_etx_pass_hook}
% \begin{macro}{\pre_second_etx_pass_hook}
% \begin{macro}{\pre_third_etx_pass_hook}
% \begin{macro}{\pre_fourth_etx_pass_hook}
% \begin{macro}{\post_first_etx_pass_hook}
% \begin{macro}{\post_second_etx_pass_hook}
% \begin{macro}{\post_third_etx_pass_hook}
% \begin{macro}{\post_fourth_etx_pass_hook}
% \begin{macro}{\tidying_up_hook}
%   \multchanges{\cs{pre_first_etx_pass_hook}^^A
%      \cs{pre_second_etx_pass_hook}\cs{pre_third_etx_pass_hook}^^A
%      \cs{pre_fourth_etx_pass_hook}\cs{post_first_etx_pass_hook}^^A
%      \cs{post_second_etx_pass_hook}\cs{post_third_etx_pass_hook}^^A
%      \cs{post_fourth_etx_pass_hook}\cs{tidying_up_hook}}{1.900}^^A
%      {1998/09/30}{ETX-to-VPL hooks added. (LH)}
% \begin{macro}{\top_of_pl_hook}
%   \changes{1.912}{2000/01/29}{Property list hook added. (LH)}
%   As the |\etxtovpl| and |\etxtopl| macros are the 
%   lowest-level interfaces to what they do that are available in 
%   \package{fontinst} and as the amount of code they execute is really 
%   quite large, I suspect that users may occationally have need of 
%   some robust mechanism for inserting extra code at well specified 
%   positions. Such a mechanism is provided by the following hooks:
%    \begin{macrocode}
\let\pre_first_etx_pass_hook\x_relax
\let\pre_second_etx_pass_hook\x_relax
\let\pre_third_etx_pass_hook\x_relax
\let\pre_fourth_etx_pass_hook\x_relax
\let\post_first_etx_pass_hook\x_relax
\let\post_second_etx_pass_hook\x_relax
\let\post_third_etx_pass_hook\x_relax
\let\post_fourth_etx_pass_hook\x_relax
\let\tidying_up_hook\x_relax
\let\top_of_pl_hook\x_relax
%    \end{macrocode}
%   The first nine are executed at the positions of the ETX-to-VPL 
%   file generation that their name indicate. |\top_of_pl_hook| is 
%   slightly different---it is executed right after a PL or VPL file 
%   is opened for writing. Thus it is also used by the MTX-to-PL system.
%   
%   To include code in one of them, one should write things like
%   \begin{quote}
%     |\add_to\pre_first_etx_pass_hook|\marg{extra code}
%   \end{quote}
%   I (LH) have the following in my \texttt{fontinst.rc} file\relax
%   \SortIndex{fontinst.rc file}{\texttt{fontinst.rc} file}
%   \begin{quote}
%     |\add_to\top_of_pl_hook{\out_line{(COMMENT~-*-Text-*-)}}|
%   \end{quote}
%   Without it, my text editor annoys me by assuming that \texttt{.pl} 
%   stands for Perl.
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
% \end{macro} \end{macro} \end{macro} \end{macro} \end{macro}
% 
% 
% \subsection{Glyph to slot assignments}
% 
% \changes{1.900}{1998/12/06}{New method of storing slot assignments. 
%    (LH)}
% The way \package{fontinst} has traditionally kept track 
% of which glyph goes to which slot---information which is needed when 
% writing the |LIGTABLE| in a (V)PL, for |\nextlarger|, and for the 
% varchar commands---is by storing the slot number in the integer 
% whose name is the name of the glyph. There are two main problems with 
% this implementation: (i)~If a user sets an integer which happens to 
% have the same name as a glyph that is not assigned to any slot, then 
% kerns for that unused glyph might be written to the file, accidentally 
% creating a kerning pair where there should be none. (ii)~It is only 
% possible to store one slot number per glyph, so if one uses the same 
% glyph for several slots then \package{fontinst} can only write kerns 
% (and ligatures) for one of the occurences, despite the fact that all 
% occurences have the same typographical need for them. These problems 
% do only occur for glyphs on the right side of a ligature/kerning 
% pair, but they are still serious enough. This part of 
% \package{fontinst} has therefore been reimplemented.
% 
% \changes{1.910}{1999/11/04}{Changed the way slot numbers are stored 
%    in \cs{slots-}\meta{glyph} control sequences. (LH)}
% The new implementation does not use integers, instead it uses a new 
% family of macros with names on the form |\slots-|\meta{glyph}^^A
% \describecsfamily{slots-\meta{glyph}}. These macros expand to 
% sequences of |\do|\thinspace\meta{character}, where \meta{character} 
% is a category 12 (other) token whose character code equals the slot 
% number.
% 
% In the entire space of such names, each slot sould be mensioned 
% at most once, with one exception, namely the slot which serves as 
% right boundary marker, which may occur twice (once for the glyph 
% which actually is assigned to the slot and once for the right boundary 
% marker glyph). To detect whether there is a collision between these two 
% uses of the slot, the right boundary marker glyph uses |\rboundary_do| 
% instead of |\do| and the glyph whose slot serves as boundarychar uses 
% |\rbserver_do| instead of |\do|. By redefining these two control 
% sequences to generate a warning message when appropriate, the occurence 
% of such a collision can be brought to the user's attention.
% 
% \changes{1.900}{1998/12/11}{Added compability code for the old 
%    interface for boundary ligatures and kerns. (LH)}
% As it turned out to not be such a big deal, some extra code (protected 
% by a \package{docstrip} switch called \Module{boundaryCompability}) 
% that makes \package{fontinst} compatible with the previous syntax for 
% boundary handling has been included. I don't recommend using 
% it though, since it makes \package{fontinst} store almost all slot 
% numbers in two places.
% 
% 
% \begin{macro}{\make_assignments}
%    \begin{macrocode}
\def\make_assignments#1{
   \let\do_slot=\assign_slot
   \let\end_do_slot=\end_assign_slot
   \def\do_boundary{\bgroup
      \let\makerightboundary=\bad_makerightboundary
   }
   \let\endsetleftboundary=\egroup
   \let\makerightboundary=\assign_rboundary
   \pre_first_etx_pass_hook
   #1
   \post_first_etx_pass_hook
   \let\end_do_slot=\empty_command
   \let\do_boundary=\x_relax
   \let\endsetleftboundary=\x_relax
   \let\makerightboundary=\gobble_one
}
%    \end{macrocode}
% \end{macro}
%
% 
% \begin{macro}{\assign_slot}
% \begin{macro}{\end_assign_slot}
%   \changes{1.907}{1999/08/20}{Slots are not assigned to glyphs that 
%      do not exist. (LH)}
%   |\assign_slot| begins the assignment of a slot to a glyph. 
%   |\end_assign_slot| completes it. In the time between these two, 
%   some information is stored in |\a_toks|, so that it can be 
%   modified by an intervening |\makerightboundary| (which is then 
%   |\assign_rboundary|).
%   
%   Note that the code below will not reset |\lccode0|. The value of 
%   this register should be considered uncertain while a ligful PL 
%   or VPL file is written, i.e., in ETX files.
%   \SortIndex{lccode0}{\cs{lccode\,0} register\encapchar usage}
%    \begin{macrocode}
\def\assign_slot{\a_toks={\do}}
\begingroup
   \catcode0=12
   \gdef\end_assign_slot{
      \ifisglyph\slot_name\then
         \lccode0=\slot_number
         \lowercase{
            \expandafter\add_to 
               \csname slots-\slot_name\expandafter\endcsname
               \expandafter{\the\a_toks^^@}
         }
%<boundaryCompability>         \x_resetint\slot_name\slot_number
      \fi
   }
%    \end{macrocode}
% \end{macro}\end{macro}
% 
% 
% \begin{macro}{\assign_rboundary}
% \begin{macro}{\bad_makerightboundary}
%   |\assign_rboundary| is what |\makerightboundary| is when it is 
%   assigning a slot to act as right boundary marker.
%   
%   |\bad_makerightboundary| is what |\makerightboundary| temporarily 
%   gets set to between |\setleftboundary| and |\endsetleftboundary|.
%    \begin{macrocode}
   \gdef\assign_rboundary#1{
      \lccode0=\slot_number
      \lowercase{\x_cs\add_to{slots-#1}{\rboundary_do^^@}}
      \x_setint{\percent_char boundarychar}\slot_number
      \a_toks={\rbserver_do}
   }
\endgroup
\def\bad_makerightboundary#1{
   \errhelp={The~left~boundary~is~not~a~slot,~so~it~cannot~serve~
      as~right~boundary.}
   \errmessage{Incorrect~use~of~\string\makerightboundary}
}
%    \end{macrocode}
% \end{macro} \end{macro}
% 
% \begin{macro}{\get_slot_num}
%   \changes{1.910}{1999/11/04}{Removed redefinition of \cs{do} to 
%      \cs{gobble_one} from temporary definition of \cs{do}, since a 
%      \cs{slots-} list usually contains only one or two elements 
%      anyway. (LH)}
%   It is sometimes necessary to get the number of an arbitrary slot 
%   given only the name of the glyph which has been assigned to the 
%   slot. In such situations, the call
%   \begin{quote}
%     |\get_slot_num{|\meta{glyph}|}|
%   \end{quote}
%   will set |\result| to the number of one such slot if the glyph has 
%   been assigned to some slot, or set |\result| to minus one if the glyph 
%   has not been assigned to a slot.
%    \begin{macrocode}
\def\get_slot_num#1{
%<*!boundaryCompability>
   \global\result=-1
   \bgroup
      \def\do{\global\result=`}
      \let\rbserver_do=\do
      \let\rboundary_do=\gobble_one
      \csname slots-#1\endcsname
   \egroup
%</!boundaryCompability>
%<*boundaryCompability>
   \ifisint{#1}\then
      \global\result=\int{#1}
   \else
      \global\result=-1
   \fi
   \x_relax
%</boundaryCompability>
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \begin{macro}{\ifisinslot}
%   The call |\ifisinslot|\marg{glyph}\marg{slot}|\then| can be used to 
%   test whether glyph \meta{glyph} has been assigned to slot \meta{slot}. 
%   Both then-part and else-part of the conditional will however be 
%   ignored when the ETX file is read the first time, since the 
%   assignment of glyph to slots need not have been completed yet.
%    \begin{macrocode}
\def\ifisinslot#1#2\then{
   \ifx \makerightboundary\gobble_one
%    \end{macrocode}
%   This is used to test if the ETX file is being read in for the first 
%   time. It is a bit hacky, but it is efficient.
%    \begin{macrocode}
      \eval_expr{#2}
      \begingroup
         \def\do##1{\ifnum `##1=\result \let\do=\gobble_one \fi}
         \def\rbserver_do{\do}
         \let\rboundary_do=\gobble_one
         \csname slots-#1\endcsname
      \expandafter\endgroup
      \ifx \do\gobble_one
         \expandafter\expandafter \expandafter\if_true
      \else
         \expandafter\expandafter \expandafter\if_false
      \fi
   \else
      \expandafter\gobble_if
   \fi
}
%</pkg>
%    \end{macrocode}
%    \begin{macrocode}
%<*doc>
\def\ifisinslot#1#2\then{%
   \generic@if{glyph \typeset@glyph{#1} assigned to slot 
   $\TypesetIntegerExpression{#2}$}%
}
%</doc>
%    \end{macrocode}
% \end{macro}
% 
% 
% \subsection{The header, mapfonts, and fontdimens}
% 
% \changes{1.913}{2000/02/26}{Using \cs{make_factor} for making PL 
%    reals, rather than \cs{afm_convert}+\cs{vpl_real}. 
%    \cs{scaled_design_size} replaced by new dimen \cs{mapfont_scaling} for 
%    determining mapfont atsize. (LH)}
% 
% \begin{macro}{\mapfont_scaling}
%   The |\mapfont_scaling| dimen is used for calculating how much a mapfont 
%   has been scaled, for use in \texttt{FONTAT} properties, and for 
%   selecting the correct mapfont. It is initialized to $1$.
%    \begin{macrocode}
%<*pkg>
\newdimen\mapfont_scaling
\mapfont_scaling=1pt
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\rawfont_scaling}
%   The |\rawfont_scaling| dimen is used for communicating the scaling 
%   that has been applied to a raw font---a font being installed using 
%   |\install|\-|rawfont|\penalty0---out to that macro. |\rawfont_|\-^^A
%   |scaling| should always be globally assigned.
%   \changes{1.913}{2000/03/21}{Dimen added. (LH)}
%    \begin{macrocode}
\newdimen\rawfont_scaling
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\scaled_design_size}
% \begin{macro}{\afm_convert}
%   The call
%   \begin{quote}
%     |\afm_convert|\meta{dimen}|=|\meta{integer expression}|;|
%   \end{quote}
%   converts a count into a dimen, assuming the count is a number
%   of AFM units.  I'll assume that the largest dimension I'll have
%   to deal with is 131\,pt, to try to minimize rounding errors.
%   
%    \begin{macrocode}
% \newdimen\scaled_design_size
%    \end{macrocode}
%    \begin{macrocode}
% \def\afm_convert#1=#2;{
%    \eval_expr{#2}
%    #1=\scaled_design_size
%    \divide#1 by 8
%    \multiply #1 by \result
%    \divide #1 by \one_thousand
%    \multiply#1 by 8
% }
%    \end{macrocode}
% \end{macro} \end{macro}
%
% \begin{macro}{\vpl_real}
% \begin{macro}{\vpl_int}
%   The commands |\vpl_real|\meta{dimen} and |\vpl_int|\meta{count} print 
%   a dimension and integer respectively in (V)PL syntax.
%   
%    \begin{macrocode}
\def\vpl_real#1{R~\expandafter\lose_measure\the#1}
\def\vpl_int#1{D~\the#1}
%    \end{macrocode}
% \end{macro} \end{macro}
%
% 
% The count register |\boundary_char| has been removed, since 
% the reimplementation of the left and right boundaries have drastically 
% decreased the need to check which slot serves as the right boundary. 
% Instead the integer |%boundarychar| (whose name cannot normally be typed) 
% is used to store the number of this slot, but the user need never (and 
% should not) access this integer directly. If the integer is not set 
% then no slot serves as boundarychar.
% \changes{1.900}{1998/12/04}{\cs{boundary_char} count register 
%    removed. Right boundary slot number is now stored in the 
%    \texttt{\%boundarychar} integer instead. (LH)}
% 
% \begin{macro}{\side_bearings}
% \begin{macro}{\curr_bearings}
%   These two dimens are used by the letterspacing mechanism.
%    \begin{macrocode}
\newdimen\side_bearings
\newdimen\curr_bearings
%    \end{macrocode}
% \end{macro} \end{macro}
%
% \begin{macro}{\make_header}
%    \begin{macrocode}
\def\make_header#1{
   \global\font_count=0
   \setdim{designsize}{10pt}
   \a_dimen=\dim{designsize}
   \out_line{(DESIGNSIZE~\vpl_real\a_dimen)}
   \x_setstr{codingscheme}{UNKNOWN}
   \out_line{(CODINGSCHEME~\str{codingscheme})}
%<*boundaryCompability>
   \ifisint{boundarychar}\then
      \x_setint{\percent_char boundarychar}{\int{boundarychar}}
      \immediate\write16{Please~use~\string\setleftboundary\space
         and/or~\string\makerightboundary^^J
         instead~of~setting~the~boundarychar~integer.}
   \fi
%</boundaryCompability>
   \ifisint{\percent_char boundarychar}\then
      \a_count=\int{\percent_char boundarychar}
      \out_line{(BOUNDARYCHAR~\vpl_int\a_count)}
   \fi
   \x_setint{letterspacing}{0}
   \side_bearings=\make_factor{\int{letterspacing}}\half_point
   \x_setint{minimumkern}{0}
   \minimum_kern=\int{minimumkern}
   \out_line{}
}
%    \end{macrocode}
%   \changes{1.900}{1999/01/20}{Removed test for no letterspacing. (LH)}
%   \changes{1.900}{1999/01/20}{Made integer expression \cs{div} a 
%      dimen \cs{divide}. (LH)}
% \end{macro}
%
% 
% \begin{macro}{\make_mapfonts}
%    \begin{macrocode}
\def\make_mapfonts#1{
   \let\saved_scale\vpl_scale
   \let\saved_mapfont\vpl_mapfont
   \let\do_slot=\do_mapfont
   \pre_second_etx_pass_hook
   #1
   \post_second_etx_pass_hook
   \out_line{}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\do_mapfont}
%   |\do_mapfont| produces a |MAPFONT| entry for each font used by
%   glyph |\slot_name|.
%    \begin{macrocode}
\def\do_mapfont{
   \ifisglyph\slot_name\then
      \mapfonts\slot_name
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% The following commands can be used in the \meta{mapfonts} glyph 
% parameter.
%
% \begin{macro}{\vpl_scale}
%    \begin{macrocode}
\def\vpl_scale#1#2{{
   \mapfont_scaling=\make_factor{#1}\mapfont_scaling
   #2
}}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_mapfont}
%   \changes{1.904}{1999/06/16}{Added \cs{record_usage}. (LH)}
%   \changes{1.913}{2000/02/26}{Mapfont number control sequences are 
%      named \cs{\meta{scaling factor}pt-\meta{font}} instead of 
%      \cs{\meta{font}-\meta{scaling factor}pt}. They are also made 
%      \cs{mathchardef}s. (LH)}
%    \begin{macrocode}
\def\vpl_mapfont#1#2{
   \a_dimen=#2
   \if_undefined{\the\mapfont_scaling-#1}\then
      \global\x_cs\mathchardef{\the\mapfont_scaling-#1}=\font_count
      \x_cs\xdef{f-\the\font_count}{\the\mapfont_scaling-#1}
      \out_line{(MAPFONT~\vpl_int\font_count\space
         (FONTNAME~#1)~
         (FONTDSIZE~\vpl_real\a_dimen)~
         (FONTAT~\vpl_real\mapfont_scaling))}
      \record_usage{#1}
      \global\advance\font_count by 1
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\pl_mapfont}
%   As PL files have no \texttt{MAPFONT} properties, the |\pl_mapfont| 
%   macro only needs to do one thing: copy the current value of 
%   |\mapfont_|\-|scaling| to |\rawfont_|\-|scaling|. This is necessary 
%   since if the raw font for which a ligful PL is being written has 
%   been scaled, then that scaling factor must be put in the appropriate 
%   place in the FD file entry, and the simplest way to determine this 
%   scaling factor is to execute the |\mapfonts| of some glyph in the 
%   font.
%   
%   Due to the fact that the second ETX file pass (that during which the 
%   \texttt{MAPFONT} properties are written) is skipped when a PL file 
%   is being written, the |\mapfonts| get executed during the fourth ETX 
%   file pass instead of the second. This works fine since the 
%   |\mapcommands| that are executed at that time when a VPL file is 
%   being written aren't needed for PL files.
%   \changes{1.913}{2000/03/21}{Macro added. (LH)}
%    \begin{macrocode}
\def\pl_mapfont#1#2{\global\rawfont_scaling=\mapfont_scaling}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\font_count}
% \begin{macro}{\next_mapfont}
% \begin{macro}{\prev_mapfont}
%    \begin{macrocode}
\newcount\font_count
\newcount\next_mapfont
\newcount\prev_mapfont
%    \end{macrocode}
% \end{macro} \end{macro} \end{macro}
%
% 
% \begin{macro}{\make_fontdimens}
%   This macro writes the \texttt{FONTDIMEN} property list. Note that 
%   there is a difference between fontdimen 1 and the others, in that 
%   fontdimen 1 is always in \texttt{pt}, not in the atsize-relative 
%   \texttt{FONTUNITS} unit that the others are. Nonetheless, they can 
%   both be treated the same here. This relies on (i) that 1000 denotes 
%   the factor 1, and (ii) that 1000 AFM units equals 1 fontunit.
%    \begin{macrocode}
\def\make_fontdimens#1{
   \out_line{(FONTDIMEN}
      \a_count=1
      \loop\ifnum 256>\a_count
         \ifisint{fontdimen(\the\a_count)}\then
            \out_lline{(PARAMETER~\vpl_int\a_count\space
               R~\make_factor{\int{fontdimen(\the\a_count)}})}
         \fi
         \advance \a_count \@ne
      \repeat
   \out_lline{)}
   \out_line{}
}
%    \end{macrocode}
% \end{macro}
%
% 
% \subsection{The ligtable}
% 
% \begin{macro}{\make_ligtable}
%   \changes{1.927}{2003/12/08}{Changed the surrounding group to 
%     \cs{begingroup} type. This helps contain errors that arise when 
%     the \cs{setslot}s and \cs{endsetslot}s aren't properly balanced. 
%     (LH)}
%    \begin{macrocode}
\def\make_ligtable#1{
   \begingroup
      \out_line{(LIGTABLE}
%<!boundaryCompability>      \let\do_slot=\bgroup
%<*boundaryCompability>
      \def\do_slot{\bgroup
         \ifisint{boundarychar}\then
            \ifnum \int{boundarychar}=\slot_number
               \def\vpl_liglabel{\out_liglabel\boundary_liglabel}
            \fi
         \fi
      }
%</boundaryCompability>
      \let\end_do_slot=\vpl_kerning
      \def\do_boundary{\bgroup \let\vpl_liglabel=\boundary_liglabel}
      \let\endsetleftboundary=\vpl_kerning
      \let\ligature=\vpl_ligature
      \let\k=\vpl_kern
      \let\rbserver_do=\vpl_rbserver_do
      \let\rboundary_do=\vpl_rboundary_do
      \pre_third_etx_pass_hook
      #1
      \post_third_etx_pass_hook
      \out_lline{)}
   \endgroup
   \out_line{}
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_rbserver_do}
% \begin{macro}{\vpl_rboundary_do}
% \begin{macro}{\wrn_rboundary_do}
%   |\vpl_rbserver_do| and |\vpl_rboundary_do| are what |\rbserver_do| 
%   and |\rboundary_do| respectively are when a ligkern program is being 
%   written and no entry has yet been written for the boundarychar 
%   slot. |\wrn_rboundary_do| is what one of them will get set to 
%   afterwards, so that warnings are written when collisions between 
%   using the slot as a right boundary marker and using the slot for 
%   the actual glyph occur.
%    \begin{macrocode}
\def\vpl_rbserver_do#1{
   \do{#1}
   \let\rboundary_do=\wrn_rboundary_do
}
\def\vpl_rboundary_do#1{
   \do{#1}
   \let\rbserver_do=\wrn_rboundary_do
}
\def\wrn_rboundary_do#1{
   \do{#1}
   \immediate\write16{Boundarychar~slot~usage~collision~in~
      `\slot_name'~ligkern~program.}
}
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% 
% 
% \begin{macro}{\vpl_ligature}
%   |\vpl_ligature{|\meta{type}|}{|\meta{glyph}|}{|\meta{glyph}|}| 
%   produces a ligtable entry for glyph |\slot_name|.
%   
%   The double spaces in the |\out_lline| statement below might look 
%   strange, but |\number| will always gobble the first one.
%    \begin{macrocode}
\def\vpl_ligature#1#2#3{
   \get_slot_num{#3}
   \ifnum -1=\result
      \immediate\write16{Warning:~\string\ligature\space
         for~unknown~slot~`#3'.}
   \else
      \x_cs\ifx{slots-#2}\x_relax
         \immediate\write16{Warning:~\string\ligature\space
            for~unknown~slot~`#2'.}
      \else
         \def\do##1{
            \vpl_liglabel
            \out_lline{(#1~D~\number`##1~\space\vpl_int\result)~
               (COMMENT~#2~#3)}
         }
         \csname slots-#2\endcsname
      \fi
   \fi
}
%    \end{macrocode}
% \end{macro}  
% 
% 
%
% \begin{macro}{\vpl_kerning}
%   |\vpl_kerning| writes out kerning instructions.
%    \begin{macrocode}
\def\vpl_kerning{
   \let\do=\vpl_kern_do
   \csname~r-\slot_name\endcsname
   \vpl_ligstop
   \egroup
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_kern}
%   |\vpl_kern|\,|\l-|\meta{name}\,|\|\meta{amount} writes out a |KRN| 
%   instruction.
%   
%   \changes{1.900}{1998/10/02}{Macro modified to avoid duplicate kerns. 
%      (LH)}
%   |\vpl_kern| has been modified so that at most one 
%   \texttt{KRN} instruction is written for each (ordered) pair of 
%   characters. The idea is basically to make \package{fontinst} forget, 
%   until the end of |\vpl_kerning|, that the glyph for which |\vpl_kern| 
%   is being called has been assigned a slot, as this stops any more 
%   \texttt{KRN} instructions for that particular glyph from being 
%   written. |\vpl_kern| has also been modified so that it will not write 
%   out any \texttt{KRN} instructions for kerns whose absolute value is 
%   less than or equal to |\minimum_kern|. |\minimum_kern| gets set to 
%   the value of the integer \texttt{minimumkern} in |\make_header|. If 
%   the user has not set \texttt{minimumkern}, a default value of 0 will 
%   be supplied by \package{fontinst}.
%   
%   \changes{1.900}{1998/12/07}{Much of the code from \cs{vpl_kern} has 
%     been moved to \cs{vpl_kern_do}. (LH)}
%   \changes{1.913}{2000/02/26}{Using a nested \cs{ifnum} construct to 
%      test the condition $\left\protect\vert
%      \protect\mbox{\cs{a_count}}\right\protect\vert \quotechar >
%      \protect\mbox{\cs{minimum_kern}}$. (LH)}
%    \begin{macrocode}
\def\vpl_kern#1#2{
   \edef\a_macro{\expandafter\gobble_three\string#1}
   \a_count=\expandafter\gobble_one\string#2\x_relax
   \ifnum \ifnum -\a_count>\a_count - \fi\a_count>\minimum_kern
      \edef\b_macro{~R~\make_factor\a_count}
      \csname slots-\a_macro\endcsname
   \fi
   \x_cs\let{slots-\a_macro}=\x_relax
}
%    \end{macrocode}
%   Observation (LH 1999/03/16): The above construction has the 
%   side-effect that a direct contradiction between a right boundary 
%   glyph and a glyph in the |%boundarychar| slot won't be detected if 
%   one of the items in contradiction is a kern less than or equal to 
%   |\minimum_kern|. Perhaps this should be changed (letting |\do| equal 
%   to |\gobble_one| would let the dectection mechanism work, but |\do| 
%   would have to be restored afterwards and it is doubtful if it is 
%   worth it).
% \end{macro}
% 
% 
% \begin{macro}{\vpl_kern_do}
%   |\vpl_kern_do| is what |\do| is defined to be when kerns are written.
%    \begin{macrocode}
\def\vpl_kern_do#1{
   \vpl_liglabel
   \out_lline{
      (KRN~D~\number`#1~\b_macro)~
      (COMMENT~\a_macro)
   }
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \begin{macro}{\out_liglabel}
% \begin{macro}{\boundary_liglabel}
% \begin{macro}{\vpl_liglabel}
%   |\out_liglabel| writes out a |LIGLABEL| instruction for a slot. 
%   |\boundary_liglabel| writes out a |LIGLABEL| instruction for the 
%   |BOUNDARYCHAR| ligkern program. |\vpl_liglabel| writes out the 
%   correct |LIGLABEL| instruction for the current ligkern program, if it 
%   is approriate.
% 
%    \begin{macrocode}
\def\out_liglabel{
   \out_lline{(LABEL~\vpl_int\slot_number)~(COMMENT~\slot_name)}
   \let\vpl_liglabel=\x_relax
   \let\vpl_ligstop=\out_ligstop
}
\def\boundary_liglabel{
   \out_lline{(LABEL~BOUNDARYCHAR)~(COMMENT~\slot_name)}
   \let\vpl_liglabel=\x_relax
   \let\vpl_ligstop=\out_ligstop
}
\let\vpl_liglabel=\out_liglabel
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
%
% \begin{macro}{\out_ligstop}
% \begin{macro}{\vpl_ligstop}
%   |\vpl_ligstop| writes out a |LIGSTOP| instruction if appropriate.
%    \begin{macrocode}
\def\out_ligstop{\out_lline{(STOP)}
   \let\vpl_liglabel=\out_liglabel
   \let\vpl_ligstop=\x_relax}
\let\vpl_ligstop=\x_relax
%    \end{macrocode}
% \end{macro} \end{macro}
%
% 
% \subsection{The characters}
% 
% \begin{macro}{\make_characters}
%    \begin{macrocode}
\def\make_characters#1{
   \bgroup
      \let\do_slot=\do_character
      \let\end_do_slot=\end_do_character
      \let\nextlarger=\vpl_nextlarger
      \let\varchar=\vpl_varchar
      \let\endvarchar=\end_vpl_varchar
      \let\vartop=\vpl_vartop
      \let\varmid=\vpl_varmid
      \let\varbot=\vpl_varbot
      \let\varrep=\vpl_varrep
      \if_including_map_
         \let\saved_raw\vpl_raw
         \let\saved_rule\vpl_rule
         \let\saved_special\vpl_special
         \let\saved_warning\vpl_warning
         \let\saved_movert\vpl_movert
         \let\saved_moveup\vpl_moveup
         \let\saved_push\vpl_push
         \let\saved_pop\vpl_pop
      \else
         \def\do_character_map{
            \ifdim \rawfont_scaling=-\p@
               \mapfonts\slot_name
            \else
               \let\do_character_map=\x_relax
            \fi
         }
         \let\saved_mapfont\pl_mapfont
         \let\saved_scale\vpl_scale
      \fi
      \pre_fourth_etx_pass_hook
      #1
      \post_fourth_etx_pass_hook
   \egroup
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\do_character}
%   \changes{1.913}{2000/03/10}{Negative italic corrections \emph{are} 
%      written to the (V)PL being generated. (LH)}
%   \changes{1.927}{2004/07/13}{Added flag for emitting warning message 
%      when a glyph is missing. (LH) Requested by Werner Lemberg.}
%   |\do_character| produces a character entry for glyph |\slot_name| in
%   slot |\slot_number|.
%   
%    \begin{macrocode}
\def\do_character{
   \if_undefined{g-\slot_name}\then
      \ifisint{requireglyphs}\then
         \fontinstwarning{ETX~to~(V)PL}{
            Undefined~glyph~`\slot_name'~requested\message_break
            for~slot~\the\slot_number\message_number}
      \fi
      \expandafter\gobble_setslot
   \else
      \ifx\slot_name\notdef_name\else
         \out_line{(CHARACTER~\vpl_int\slot_number\space
            (COMMENT~\slot_name)}
         \glyph_parameter\glyph_metrics\slot_name
         \a_dimen=\make_factor\a_count \p@
         \do_character_sidebearings
         \out_lline{(CHARWD~\vpl_real\a_dimen)}
         \ifnum \z@=\b_count \else
            \out_lline{(CHARHT~R~\make_factor\b_count)}
         \fi
         \ifnum \z@=\c_count \else
            \out_lline{(CHARDP~R~\make_factor\c_count)}
         \fi
         \ifnum \z@=\d_count \else
            \out_lline{(CHARIC~R~\make_factor\d_count)}
         \fi
         \do_character_map
      \fi
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\do_character_sidebearings}
%    \begin{macrocode}
\def\do_character_sidebearings{
   \ifisint{\slot_name-spacing}\then
      \curr_bearings=\make_factor{\int{\slot_name-spacing}}\half_point
   \else
      \curr_bearings=\side_bearings
   \fi
   \advance\a_dimen by 2\curr_bearings
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\do_character_map}
%    \begin{macrocode}
\def\do_character_map{
   \global\prev_mapfont=0
   \out_lline{(MAP}
   \ifdim 0pt=\curr_bearings
      \mapcommands\slot_name
   \else
      \out_llline{(MOVERIGHT~\vpl_real\curr_bearings)}
      \mapcommands\slot_name
      \out_llline{(MOVERIGHT~\vpl_real\curr_bearings)}
   \fi
   \out_llline{)}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\do_character_no_letterspacing}
%   LH 1999/03/27: This is an alternative version of |\do_character| 
%   which I think is now antiquated. It used to have an advantage over 
%   |\do_character| in that it did not do any letterspacing (in v\,1.5, 
%   that was good since |\do_character| used to write code for 
%   letterspacing to the VPL regardless of whether is was needed or 
%   not), but that advantage is gone since |\do_character_map| is now
%   a bit less stupid than it used to be.
%   
%   For the record, I don't think there ever was a user interface for 
%   using this macro instead of |\do_character|, but I suspect there 
%   are plenty of people around who have hacked it into being used.
%   
%   With v\,1.913 I commented it out completely, since I didn't feel 
%   like updating the calls to |\afm_convert|.
%    \begin{macrocode}
%<*obsolete>
% \def\do_character_no_letterspacing{
%    \x_cs\ifx{g-\slot_name}\x_relax
%       \expandafter\gobble_setslot
%    \else
%       \ifx\slot_name\notdef_name\else
%          \out_line{(CHARACTER~\vpl_int\slot_number\space
%             (COMMENT~\slot_name)}
%          \afm_convert\a_dimen=\width\slot_name;
%          \out_lline{(CHARWD~\vpl_real\a_dimen)}
%          \afm_convert\a_dimen=\height\slot_name;
%          \out_lline{(CHARHT~\vpl_real\a_dimen)}
%          \afm_convert\a_dimen=\depth\slot_name;
%          \out_lline{(CHARDP~\vpl_real\a_dimen)}
%          \afm_convert\a_dimen=\italic\slot_name;
%          \ifnum\a_dimen>0 \out_lline{(CHARIC~\vpl_real\a_dimen)} \fi
%          \global\prev_mapfont=0 \out_lline{(MAP}
%             \mapcommands\slot_name
%          \out_llline{)}
%       \fi
%    \fi
% }
%</obsolete>
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\gobble_setslot}
%    \begin{macrocode}
\long\def\gobble_setslot#1\endsetslot{\endsetslot}
%    \end{macrocode}
%   \changes{1.901}{1999/03/27}{Made \cs{gobble_setslot} a \cs{long} 
%      macro. (LH)}
% \end{macro}
%
% \begin{macro}{\end_do_character}
%    \begin{macrocode}
\def\end_do_character{
   \ifisglyph\slot_name\then
      \out_lline{)}
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\notdef_name}
%    \begin{macrocode}
\def\notdef_name{.notdef}
%    \end{macrocode}
% \end{macro}
%
% 
% \subsection{Slot commands that put things in a character property list}
% 
% Here follows the active definitions for those slot commands that 
% causes things to be put in |CHARACTER| property lists.
% 
% \begin{macro}{\vpl_nextlarger}
%   |\vpl_nextlarger|\marg{name} produces a |NEXTLARGER| entry.
%    \begin{macrocode}
\def\vpl_nextlarger#1{
   \get_slot_num{#1}
   \ifnum -1<\result
      \out_lline{(NEXTLARGER~D~\the\result)~(COMMENT~#1)}
   \else
      \immediate\write16{Warning:~\string\nextlarger\space
         for~unknown~slot~`#1'}
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\vpl_varchar}
% \begin{macro}{\end_vpl_varchar}
%   |\vpl_varchar| \meta{varchar commands} |\end_vpl_varchar| produces 
%   a |VARCHAR| entry.
%   
%    \begin{macrocode}
\def\vpl_varchar{\out_lline{(VARCHAR}}
%    \end{macrocode}
%    \begin{macrocode}
\def\end_vpl_varchar{\out_llline{)}}
%    \end{macrocode}
% \end{macro} \end{macro}
%
%
% \begin{macro}{\vpl_vartop}
%    \begin{macrocode}
\def\vpl_vartop#1{
   \get_slot_num{#1}
   \ifnum -1<\result
      \out_llline{(TOP~D~\the\result)~(COMMENT~#1)}
   \else
      \immediate\write16{Warning:~\string\vartop\space
         for~unknown~slot~`#1'}
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_varmid}
%    \begin{macrocode}
\def\vpl_varmid#1{
   \get_slot_num{#1}
   \ifnum -1<\result
      \out_llline{(MID~D~\the\result)~(COMMENT~#1)}
   \else
      \immediate\write16{Warning:~\string\varmid\space
         for~unknown~slot~`#1'}
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_varbot}
%    \begin{macrocode}
\def\vpl_varbot#1{
   \get_slot_num{#1}
   \ifnum -1<\result
      \out_llline{(BOT~D~\the\result)~(COMMENT~#1)}
   \else
      \immediate\write16{Warning:~\string\varbot\space
         for~unknown~slot~`#1'}
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_varrep}
%    \begin{macrocode}
\def\vpl_varrep#1{
   \get_slot_num{#1}
   \ifnum -1<\result
      \out_llline{(REP~D~\the\result)~(COMMENT~#1)}
   \else
      \immediate\write16{Warning:~\string\varrep\space
         for~unknown~slot~`#1'}
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \subsection{Saved map commands}
% 
% The following commands (and |\vpl_scale|, which is defined above) can 
% be used in the \meta{mapcommands} glyph parameter.
% 
% \begin{macro}{\vpl_raw}
%   This macro writes the entries in a \texttt{MAP} that are needed for 
%   the given raw character. Note that the `at' comment below gives the 
%   scaling relative to the atsize of the virtual font, not the physical 
%   atsize.
%   \IndexEntry{\LevelSame{PL properties:}^^A
%      \LevelSorted{SELECTFONT}{\texttt{SELECTFONT}}^^A
%   }{usage}{\thepage}
%    \begin{macrocode}
\def\vpl_raw#1#2#3{
   \global\next_mapfont=\csname\the\mapfont_scaling-#1\endcsname
   \ifnum \next_mapfont=\prev_mapfont \else
      \out_llline{(SELECTFONT~\vpl_int\next_mapfont)~
         (COMMENT~#1~at~
          \expandafter\lose_measure \the\mapfont_scaling)}
   \fi
   \out_llline{(SETCHAR~D~#2)~(COMMENT~#3)}
   \global\prev_mapfont=\next_mapfont
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_rule}
%    \begin{macrocode}
\def\vpl_rule#1#2{
   \a_dimen=\make_factor{#2}\mapfont_scaling
   \b_dimen=\make_factor{#1}\mapfont_scaling
   \out_llline{(SETRULE~\vpl_real\a_dimen\space\vpl_real\b_dimen)}
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\vpl_special}
% \begin{macro}{\vpl_warning}
% \begin{switch}{warningspecials}
%   \changes{1.913}{2000/02/26}{Switch controlling whether 
%      \cs{glyphwarning}s should put \texttt{SPECIALS} in the VPL was 
%      added. (LH)}
%    \begin{macrocode}
\def\vpl_special#1{
   \out_llline{(SPECIAL~#1)}}
%    \end{macrocode}
%    \begin{macrocode}
\def\vpl_warning#1{
   \ifwarningspecials
      \out_llline{(SPECIAL~Warning:~#1)}
   \fi
   \immediate\write16{Warning:~#1.}
}
%    \end{macrocode}
%    \begin{macrocode}
\newif\ifwarningspecials
\warningspecialstrue
%    \end{macrocode}
% \end{switch}\end{macro}\end{macro}
% 
% \begin{macro}{\vpl_movert}
% \begin{macro}{\vpl_moveup}
%    \begin{macrocode}
\def\vpl_movert#1{
   \a_dimen=\make_factor{#1}\mapfont_scaling
   \out_llline{(MOVERIGHT~\vpl_real\a_dimen)}
}
%    \end{macrocode}
%    \begin{macrocode}
\def\vpl_moveup#1{
   \a_dimen=\make_factor{#1}\mapfont_scaling
   \out_llline{(MOVEUP~\vpl_real\a_dimen)}
}
%    \end{macrocode}
% \end{macro} \end{macro}
% 
% \begin{macro}{\vpl_push}
% \begin{macro}{\vpl_pop}
%    \begin{macrocode}
\def\vpl_push{\out_llline{(PUSH)}}
%    \end{macrocode}
%    \begin{macrocode}
\def\vpl_pop{\out_llline{(POP)}}
%    \end{macrocode}
% \end{macro} \end{macro}
%
% 
% \subsection{Tidying up}
% 
% \begin{macro}{\make_tidy}
%   If a VPL file was written, the tidying up consists of clearing the 
%   list of mapfont numbers, since that is stored globally. If a PL 
%   file was written, the tidying up consists of writing a 
%   \texttt{DESIGNUNITS} property for those fonts which need one.
%    \begin{macrocode}
\def\make_tidy#1{
   \tidying_up_hook
   \if_including_map_
      \a_count=0
      \loop\ifnum \a_count<\font_count
         \edef\a_macro{\csname~f-\the\a_count\endcsname}
         \global\x_cs\let\a_macro\x_relax
         \advance\a_count by 1
      \repeat
      \global\font_count=0
   \else
      \ifdim \rawfont_scaling<\z@
         \fontinstwarning{ETX~to~(V)PL}{The~font~
            \out_filename\space doesn't~contain~any~characters}
         \global\rawfont_scaling=\p@
      \fi
      \ifdim \rawfont_scaling=\p@ \else
         \out_line{(DESIGNUNITS~\vpl_real\rawfont_scaling)}
      \fi
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% 
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 
% \section{Font installation commands and \texttt{.fd} files}
% 
% \DescribeMacro{\installfonts}
% \DescribeMacro{\endinstallfonts}
% The call
% \begin{quote}
%    |\installfonts| \meta{install commands} |\endinstallfonts|
% \end{quote}
% is the top-level interface for installing a number of fonts
% and creating |.fd| files for them.
%
% \DescribeMacro{\installfamily}
% \DescribeMacro{\installfont}
% \DescribeMacro{\installrawfont}
% The \meta{install commands} are:
% \begin{isyntax}
%    |\installfamily|\marg{encoding}\marg{family}\marg{FD-commmands}\\
%    |\installfont|\marg{font-name}\marg{file-list}\marg{etx}\penalty0
%      \marg{encoding}\marg{family}\marg{series}\marg{shape}\marg{size}\\
%    |\installrawfont|\marg{font-name}\marg{file-list}\marg{etx}^^A
%      \penalty0
%      \marg{encoding}\marg{family}\marg{series}\marg{shape}\marg{size}\\
%    |\installfontas|\marg{font-name}\penalty0\marg{encoding}^^A
%       \marg{family}\marg{series}\marg{shape}\marg{size}
% \end{isyntax}
%
% Each |\installfamily| command causes the generation of an |.fd| file
% for \meta{encoding} and \meta{family}, which is writen out by the time
% |\endinstallfonts| is processed.
%
% Each |\installfont| generates a |.vpl| font by calling |\etxtovpl|
% and adds an |.fd| entry.
% Each |\installrawfont| generates a ligfull |.pl| font by calling
% |\etxtopl| and adds an |.fd| entry.  (Raw |.pl| fonts, containing only
% the glyph metrics without any ligaturing or kerning information,
% are also generated by |\mtxtopl| called from |\transformfont|
% statements.)
%
% \changes{1.912}{2000/01/15}{\cs{install}\dots\ commands updated to 
%    set \cs{setsomething_global} to \cs{global} around themselves. This 
%    reduces problems with assignments ``not working'' due to the 
%    unintuitive grouping. (LH) Problem pointed out by Hilmar 
%    Schlegel, , and others.}
%
% \begin{macro}{\installfonts}
%   Initializes the |\family_toks| token register, which is used to store 
%   the information which is written out to |.fd| files at the end of the 
%   job.
%
%    \begin{macrocode}
\newtoks\family_toks
\def\installfonts{
   \bgroup
   \global\family_toks={}
   \gdef\prev_file_list{}
   \global\let\setsomething_global=\global
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\installfamily}
%   |\installfamily|\marg{encoding}\marg{family}\marg{FD-commmands}
%   
%   Adds the command
%   \begin{quote}
%     |\fd_family|\marg{encoding}\marg{family}\marg{FD-commmands}
%   \end{quote}
%   to the token list |\family_toks| and defines a macro 
%   |\|\meta{encoding}|-|\meta{family}.^^A
%   \describecsfamily{\meta{encoding}-\meta{family}}
%
%    \begin{macrocode}
\def\installfamily#1#2#3{
   \global\family_toks=
      \expandafter{\the\family_toks\fd_family{#1}{#2}{#3}}
   \global\x_cs\let{#1-#2}\empty_command
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\installfont}
% \begin{macro}{\installrawfont}
%   \changes{1.904}{1999/06/16}{Added \cs{record_usage}. (LH)}
%   \multchanges{\cs{installfont}\cs{installrawfont}}{1.913}{2000/03/21}
%      {Moved some code from \cs{install_font} to these commands. (LH)}
%   |\installfont|\marg{font-name}\marg{file-list}\marg{etx}\\
%   \vadjust{}\qquad \marg{encoding}\marg{family}\marg{series}^^A
%     \marg{shape}\marg{size}\\
%   |\installrawfont|\marg{font-name}\marg{file-list}\marg{etx}\\
%   \vadjust{}\qquad \marg{encoding}\marg{family}\marg{series}^^A
%     \marg{shape}\marg{size}
%
%    \begin{macrocode}
\def\installfont#1#2#3#4#5#6#7#8{
   \global\let\setsomething_global=\x_relax
   \input_metrics{}{#2}
   \etxtovpl{#3}{#1}
   \installfontas{#1}{#4}{#5}{#6}{#7}{#8}
   \global\let\setsomething_global=\global
}
\def\installrawfont#1#2#3#4#5#6#7#8{
   \global\let\setsomething_global=\x_relax
   \xdef\out_filename{#1}
   \input_metrics{\let\storemapdata=\installraw_storemap}{#2}
   \let\storemapdata=\gobble_three
   \etxtopl{#3}{#1}
   \record_usage{#1}
   \installfontas{
      \ifdim \rawfont_scaling=\p@ \else
         [\expandafter\lose_measure\the\rawfont_scaling]~
      \fi #1
   }{#4}{#5}{#6}{#7}{#8}
   \global\let\setsomething_global=\global
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\installraw_storemap}
%   The |\installraw_storemap| macro is a definition of |\storemapdata| 
%   that is used when the metrics for a ligful PL file is being inputed. 
%   Its job is to write a |\storemapdata| command for this PL to the 
%   transforms record file if the PL being written does not have the 
%   same name as the MTX that the metrics are taken from (the 
%   information is already stored if both files have the same name). 
%   |\out_filename| is prematurely set by |\installrawfont| (i.e., long 
%   before the PL file is actually opened) so that it can be used in 
%   comparing the file names.
%   \changes{1.913}{1999/03/23}{Macro added. (LH)}
%    \begin{macrocode}
\def\installraw_storemap#1#2#3{
   \def\a_macro{#1}
   \ifx \a_macro\out_filename \else
      \record_transform{\out_filename}{\string\frommtx{#1}}{}\if_false
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \begin{macro}{\input_metrics}
%   The |\input_metrics| macro takes a comma-separated list of metric 
%   files as its second argument and sees to that exactly these metrics 
%   are loaded. If the list is identical to that used in the last call 
%   to |\input_metrics|, then this is already the case and 
%   |\input_metrics| simply refrains from flushing those previous 
%   metrics from \TeX's memory. Otherwise it closes a group (flushing 
%   the metrics from a previous call), opens a group (so that these 
%   metrics can be flushed at the next |\installfont| or 
%   |\installrawfont| command, if necessary), and starts inputting the 
%   metrics files in question.
%   
%   The first argument consists of code that will be executed after the 
%   group has been closed and opened, but before any metrics is inputed.
%   \changes{1.900}{1999/02/13}
%     {Use \cs{process_csep_list} for file-list. (LH)}
%   \changes{1.914}{2000/05/26}{Redefined to suite \cs{file_list_metrics}. 
%      In particular, there will now be a comma at the end of 
%      \cs{curr_file_list} and \cs{prev_file_list}. (LH)}
%    \begin{macrocode}
\def\input_metrics#1#2{
   \let\metrics=\file_list_metrics
   \xdef\curr_file_list{#2,}
   \let\metrics=\x_relax
   \ifx\prev_file_list\curr_file_list\else
      \egroup\bgroup
      #1
      \expandafter\process_csep_list \expandafter\input_mtx_file
        \curr_file_list\process_csep_list,
      \global\let\prev_file_list=\curr_file_list
   \fi
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\file_list_metrics}
%   The |\file_list_metrics| macro is a definition of |\metrics| that 
%   is used in the \meta{file-list} argument of |\install|\-|font| and 
%   |\install|\-|raw|\-|font| when that is |\xdef|ed by |\input_metrics|. 
%   This special definition prevents the succeeding \meta{metric 
%   commands} from getting expanded.
%   \changes{1.914}{2000/05/26}{Macro added. (LH)}
%    \begin{macrocode}
\def\file_list_metrics#1,{
   \iffalse{\fi}
   \a_toks=\expandafter{\curr_file_list\x_relax#1,}
   \xdef\curr_file_list{\the\a_toks \iffalse}\fi
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\installfontas}
%   The |\installfontas| command has the syntax
%   \begin{isyntax}
%     |\installfontas|\marg{font-info}\marg{encoding}\marg{family}^^A
%       \penalty0\marg{series}\penalty0\marg{shape}\penalty0\marg{size}
%   \end{isyntax}
%   The precise definition of a \meta{font-info} can be found in 
%   \cite[Sec.~4]{fntguide}, here it suffices to say that a font name 
%   (name of (V)PL file) is a valid \meta{font-info}. The |\installfontas| 
%   command adds an entry for the \meta{font-info} font to a font 
%   definition file, giving it the NFSS attributes \meta{encoding}^^A
%   \texttt{/}\nolinebreak[1]\meta{family}\texttt{/}\nolinebreak[1]^^A
%   \meta{series}\texttt{/}\nolinebreak[1]\meta{shape}\texttt{/}^^A
%   \nolinebreak[1]\meta{size}. The substitution mechanism will act on 
%   \meta{series} and \meta{shape}, and it is therefore possible that 
%   \meta{font-info} will appear in more than one |\Declare|\-|Font|\-^^A
%   |Shape| command. \meta{size} can be either some \meta{size-infos}, 
%   as defined in \cite[Sec.~4]{fntguide}, or a \package{fontinst} 
%   shorthand for a such, declared using |\declaresize|.
%   \changes{1.912}{2000/01/16}{Command added. (LH)}
%   \changes{1.913}{2000/03/02}{Specification changed to allow 
%      arbitrary \meta{font-info}s as first argument. (LH)}
%   \changes{1.921}{2002/03/27}{Automatically doing an 
%      \cs{installfamily} if that has not been done. (LH) Suggested 
%      by Rowland McDonnell.}
%    \begin{macrocode}
\def\installfontas#1#2#3#4#5#6{
   \if_undefined{#2-#3-#4-#5}\then
      \let\do_shape=\x_relax
      \if_undefined{#2-#3}\then
         \x_cs\let{#2-#3}\empty_command
         \autoinstallfamily{#2}{#3}
      \fi
      \x_cs\xdef{#2-#3}{
         \csname#2-#3\endcsname
         \do_shape{#2}{#3}{#4}{#5}
      }
   \fi
   \let\do_size=\x_relax
   \x_cs\xdef{#2-#3-#4-#5}{
      \if_defined{#2-#3-#4-#5}\then
         \csname#2-#3-#4-#5\endcsname
      \fi
      \do_size{#6}{#1}
   }
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\autoinstallfamily}
%   This command is called by |\installfontas| when it is asked to 
%   install a font for which no |\installfamily| has been given. The 
%   syntax is
%   \begin{quote}
%     |\autoinstallfamily|\marg{encoding}\marg{family}
%   \end{quote}
%   It defaults to calling |\installfamily| in the obvious way, but 
%   it can be redefined if the user wants something different.
%   \changes{1.924}{2003/02/08}{Macro added. (LH)}
%    \begin{macrocode}
\def\autoinstallfamily#1#2{\installfamily{#1}{#2}{}}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\endinstallfonts}
%   Finish the installation by processing the |\family_toks|
%   token register, which contains the accumulated information
%   to be written out to |.fd| files.
%
%    \begin{macrocode}
\def\endinstallfonts{
   \global\let\setsomething_global=\x_relax
   \let\do_shape=\fd_shape
   \let\do_size=\fd_size
   \the\family_toks
   \global\family_toks{}
   \egroup
}
%    \end{macrocode}
% \end{macro}
%
% 
% The |\installfont| command has traditionally allowed that names of 
% base fonts (MTX files) are suffixed by a 
% \verb*" scaled "\meta{factor} that would cause the \texttt{rawscale} 
% integer to be set and thereby scale everything that was in that base 
% font by the said \meta{factor}. There is now a more general approach 
% to this. If the control sequence 
% \describecsfamily{IFKW-\meta{keyword}}|IFKW-|\meta{keyword} is 
% defined then \meta{keyword} may be used as \texttt{scaled} is above; 
% this control sequence should grab all the ``arguments'' of the 
% keyword, process them as necessary, and end with the |\get_keyword| 
% macro so that another keyword may be processed. As a rule, the 
% arguments and keywords are delimited from each other by single spaces. 
% A macro grabbing an argument grabs also the space after it. The 
% \texttt{IFKW} is for \texttt{I}nstall\texttt{F}ont 
% \texttt{K}ey\texttt{W}ord.
% 
% \changes{1.923}{2002/10/09}{Added support for keywords other than 
%    \texttt{scaled} in the second argument of \cs{installfont} and 
%    such. (LH)}
% 
% \begin{macro}{\input_mtx_file}
%   The |\input_mtx_macro| takes one undelimited argument. It 
%   interprets this argument as if it was one item in the \meta{file-list} 
%   argument of |\install|\-|font| or |\install|\-|rawfont|, and does 
%   the corresponding processing. The argument should be one of the 
%   following three things:
%   \begin{quote}
%     \meta{font}\meta{optional modifiers}\\
%     |\metrics| \meta{metric commands}\\
%     \meta{nothing}
%   \end{quote}
%   If, in the first case, an MTX file for \meta{font} does not 
%   exist then it is generated on the fly from a corresponding |.pl|, 
%   |.afm|, or |.vpl| file in the call to |\fromany|. In the second 
%   case, the \meta{metric commands} simply get executed. In the third 
%   case, nothing happens.
%   
%   The \meta{optional modifiers} is either empty or has the form 
%   \meta{modifier clause}\meta{optional modifiers}. A \meta{modifier 
%   clause} generally has the form
%   \begin{quote}
%     \verb*" "\meta{keyword}\verb*" "\meta{argument(s)}
%   \end{quote}
%   e.g.,
%   \begin{quote}
%     \verb*| scaled |\meta{rawscale factor}
%   \end{quote}
%   
%   \changes{1.904}{1999/06/16}{Now using \cs{fromany} to make an MTX 
%      file when necessary. Furthermore testing for empty argument using 
%      \cs{ifx} rather than \cs{if}. (LH)}
%   \changes{1.912}{2000/01/15}{Added error message. (LH) Suggested by 
%      Alexei Kostin.}
%   \changes{1.914}{2000/05/26}{Can now accept arbitrary metric 
%      commands in argument. (LH)}
%    \begin{macrocode}
\def\input_mtx_file#1{
   \reset_modifiers_hook
   \ifx\x_relax#1\x_relax
%    \end{macrocode}
%   This tests for an empty argument, but it also lets explicit metric 
%   commands be executed. 
%    \begin{macrocode}
   \else
      \identity_one{\get_file_name #1~}~\par
%    \end{macrocode}
%   The two spaces have the effect of putting an empty keyword modifier 
%   last in the \meta{optional modifiers}. If everything is all right 
%   then this will gobble the |\par|. However, if the user forgot some 
%   argument of the last keyword then there will be an error message 
%   when |\get_keyword| will try to grab the next keyword.
%   
%   If an encoding has been specified then the source file must be a PL 
%   or VPL file (since these are the only ones for which it makes sense 
%   to specify an encoding), otherwise we rely on |\fromany| to find a 
%   font metrics file.
%   \changes{1.926}{2003/07/10}{Only looking for PL and VPL files when 
%      an encoding is specified. (LH)}
%   \changes{1.929}{2005/01/13}{Missing space in message inserted. (LH)
%     Pointed out by Peter Dyballa.}
%    \begin{macrocode}
      \ifx \pl_encoding\empty_command
         \fromany\file_name
      \else
         \metrics_given_encoding{\file_name}{\pl_encoding}
      \fi
      \ifisstr{afm-name}\then 
         \inputmtx{\str{afm-name}}
      \else
         \fontinsterror{\string\install...}{
            Font/MTX~file~\file_name\space not~found
         }{
            You~can~insert~an~\string\inputmtx\space command~here
            \messagebreak to~input~some~other~MTX~file~instead.
            \ifisint{rawscale}\then \messagebreak 
            The~requested~raw~scaling~will~then~be~applied~on~that.
            \fi
         }
      \fi
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\metrics_given_encoding}
%   This macro is a cousin of |\fromany|, for the case that metrics are 
%   taken from a (V)PL file that furthermore is assigned nonstandard 
%   metrics. The syntax is
%   \begin{quote}
%     |\metrics_given_encoding|\marg{font}\marg{etx}
%   \end{quote}
%   and the generated MTX file is named 
%   \meta{font}\texttt{-}\meta{etx}\texttt{.mtx} to avoid that it is 
%   picked up by |\fromany| by mistake.
%   \changes{1.929}{2005/01/12}{The \texttt{afm-name} string usually has 
%      a value at this point, so it is necessary to reset it. (LH, 
%      sighing because he knows this isn't the first time this problem 
%      occurred) First to be hit by this bug was Michael Zedler.}
%    \begin{macrocode}
\def\metrics_given_encoding#1#2{
   \x_cs\edef{s-afm-name}{#1-#2}
   \if_file_exists{#1.pl}\then
      \generalpltomtx{#1}{#1-#2}{pl}{#2}
   \else
      \if_file_exists{#1.vpl}\then
         \generalpltomtx{#1}{#1-#2}{vpl}{#2}
      \else
         \unsetstr{afm-name}
   \fi\fi
}
%    \end{macrocode}
% \end{macro}
% 
% 
% \definechange{option-keyword}{1.924}{2002/02/16}{Added mechanism
%    for passing options to MTX and ETX files. (LH)}
% 
% \begin{macro}{\reset_modifiers_hook}
%   The |\reset_modifiers_hook| macro contains code that initialises 
%   all parameters that are modified by some \meta{modifier clause} to 
%   their default values. If you need to add some initialisations due 
%   to that you define additional keywords then you should append 
%   these initialisations to this macro.
%   \usechange{option-keyword}
%    \begin{macrocode}
\def\reset_modifiers_hook{
   \unsetint{rawscale}
   \let\glyph_name_modifier\identity_one
   \let\pl_encoding\empty_command
   \let\list_of_options\empty_command
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\get_file_name}
%   The macro |\get_file_name| grabs the base font (or other MTX file) 
%   name and starts the processing of the \meta{optional modifiers}.
%    \begin{macrocode}
\def\get_file_name #1~{
   \edef\file_name{#1}
   \get_keyword
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\get_keyword}
% \begin{macro}{\gobble_keywords}
%   The |\get_keyword| macro expects to be expanded in the context
%   \begin{quote}
%     |\get_keyword|\,\meta{keyword}\verb*" "
%   \end{quote}
%   where the \meta{keyword} is a possible keyword. If 
%   |\IFKW-|\meta{keyword} is defined then the above expands to it, 
%   otherwise the above expands to an error message followed by a 
%   |\gobble_keywords|, which will gobble the rest of the list of 
%   keywords and arguments.
%    \begin{macrocode}
\def\get_keyword #1~{
   \if_defined{IFKW-#1}\then
      \csname IFKW-#1 \expandafter\endcsname
   \else
      \fontinsterror{\string\install...}{
         `#1'~is~not~a~defined~keyword
      }{
         \error_help_a\messagebreak
         Extra~tokens~will~be~flushed.
      }
      \expandafter\gobble_keywords
   \fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\gobble_keywords#1\par{}
%    \end{macrocode}
% \end{macro}\end{macro}
% 
% \begin{macro}{\IFKW-}
%   The empty keyword is used to flag the end of the \meta{optional 
%   modifiers}.
%    \begin{macrocode}
\x_cs\let{IFKW-}=\gobble_keywords
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\IFKW-scaled}
%   This macro handles grabbing the argument of the traditional 
%   \texttt{scaled} keyword.
%   \changes{1.900}{1999/02/05}{Changed \cs{setint} to \cs{resetint}. 
%      (LH)}
%    \begin{macrocode}
\x_cs\def{IFKW-scaled}#1~{
   \ifnum #1=\one_thousand
      \unsetint{rawscale}
   \else
      \x_resetint{rawscale}{#1}
   \fi
   \get_keyword
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\IFKW-suffix}
%   This macro handles grabbing the argument of the \texttt{suffix} 
%   keyword. The effect of `\texttt{suffix} \meta{suffix}' is that 
%   \meta{suffix} will be appended to the name of every glyph defined 
%   by the next MTX file to be read in.
%    \begin{macrocode}
\x_cs\def{IFKW-suffix}#1~{
   \def\glyph_name_modifier##1{##1#1}
   \get_keyword
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\IFKW-encoding}
% \begin{macro}{\pl_encoding}
%   This macro handles grabbing the argument of the \texttt{encoding} 
%   keyword. The effect of `\texttt{encoding} \meta{etx}' is that 
%   \meta{etx} will be used as encoding when converting a PL or VPL 
%   file to MTX. |\pl_encoding| is used for storing the argument 
%   value. Its expansion is normally empty, which means |\fromafm| 
%   handles locating the metrics file and the encoding used for a PL 
%   or VPL is determined by its codingscheme.
%    \begin{macrocode}
\x_cs\def{IFKW-encoding}#1~{
   \def\pl_encoding{#1}
   \get_keyword
}
\let\pl_encoding=\empty_command
%    \end{macrocode}
% \end{macro}\end{macro}
% 
% 
% \begin{macro}{\IFKW-option}
%   This macro handles grabbing the argument of the \texttt{option} 
%   keyword. One can test using |\ifoption| whether a particular option 
%   was specified.
%   \usechange{option-keyword}
%    \begin{macrocode}
\x_cs\def{IFKW-option}#1~{
   \add_to\list_of_options{\do{#1}}
}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\ifoption}
%   \usechange{option-keyword}
% \begin{macro}{\list_of_options}
%   \usechange{option-keyword}
%   The |\ifoption| command is used to test whether a particular option 
%   is present on the list of options. The syntax is
%   \begin{quote}
%     |\ifoption|\marg{string}|\then|
%   \end{quote}
%   and it is tested whether the \meta{string} was one of the options 
%   given. Like strings in general, the \meta{string} is expanded 
%   before it is compared to the options listed in |\list_of_options|.
%   
%   The |\list_of_options| is a sequence of items on the form
%   \begin{quote}
%     |\do|\marg{option}
%   \end{quote}
%   where each \meta{option} is an already expanded string of 
%   characters.
%    \begin{macrocode}
\def\ifoption#1\then{
   \_a_false
   \edef\a_macro{#1}
   \def\do##1{
      \if_a_ \else
         \def\b_macro{##1}
         \ifx \a_macro\b_macro \_a_true \fi
      \fi
   }
   \list_of_options
   \if_a_
}
%</pkg>
%<*doc>
\def\ifoption#1\then{%
   \generic@if{option \TypesetStringExpression{#1}}%
}
%</doc>
%<*pkg>
\let\list_of_options\empty_command
%    \end{macrocode}
% \end{macro}\end{macro}
%
% 
% \subsection{Writing font definition files}
% 
% \begin{macro}{\fd_family}
%    |\fd_family{ENCODING}{FAMILY}{FD-COMMANDS}|
%
% Writes out an |.fd| file for the specified |ENCODING| and |FAMILY|
% processing the accumulated information and default substitutions.
%
%    \begin{macrocode}
\def\fd_family#1#2#3{
   \a_toks{#3}
   \edef\lowercase_file{\lowercase{
     \edef\noexpand\lowercase_file{#1#2.fd}}}
   \lowercase_file
   \open_out{\lowercase_file}
   \out_line{\percent_char~Filename:~\lowercase_file}
   \out_line{\percent_char~Created~by:~tex~\jobname}
   \out_line{\percent_char~Created~using~fontinst~v\fontinstversion}
   \out_line{}
   \out_line{\percent_char~THIS~FILE~SHOULD~BE~PUT~IN~A~TEX~INPUTS~
      DIRECTORY}
   \out_line{}
   \out_line{\string\ProvidesFile{\lowercase_file}}
   \out_lline{[
      \the\year/
      \ifnum10>\month0\fi\the\month/
      \ifnum10>\day0\fi\the\day\space
      Fontinst~v\fontinstversion\space
      font~definitions~for~#1/#2.
   ]}
   \out_line{}
   \out_line{\string\DeclareFontFamily{#1}{#2}{\the\a_toks}}
   {
      \csname #1-#2\endcsname
      \out_line{}
      \let\do_shape=\substitute_shape
      \csname #1-#2\endcsname
      \let\do_shape=\remove_shape
      \csname #1-#2\endcsname
   }
   \x_cs\g_let{#1-#2}\x_relax
   \out_line{}
   \out_line{\string\endinput}
   \close_out{Font~definitions}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\fd_shape}
%    |\fd_shape{ENCODING}{FAMILY}{SERIES}{SHAPE}|
%
%    \begin{macrocode}
\def\fd_shape#1#2#3#4{
   \out_line{}
   \out_line{\string\DeclareFontShape{#1}{#2}{#3}{#4}\left_brace_char}
   \csname #1-#2-#3-#4\endcsname
   \x_cs\g_let{#1-#2-#3-#4}\empty_command
   \out_line{\right_brace_char{}}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\fd_size}
%    |\fd_size{SIZE}{FONT-NAME}|
%
%    \begin{macrocode}
\def\fd_size#1#2{
   \x_cs\ifx{siz-#1}\x_relax
      \out_lline{#1~#2}
   \else
      \out_lline{\csname siz-#1\endcsname\space #2}
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\remove_shape}
%    |\remove_shape{ENCODING}{FAMILY}{SERIES}{SHAPE}|
%
%    \begin{macrocode}
\def\remove_shape#1#2#3#4{
   \x_cs\g_let{#1-#2-#3-#4}\x_relax
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\substitute_shape}
%    |\substitute_shape{ENCODING}{FAMILY}{SERIES}{SHAPE}|
%
%    \begin{macrocode}
\def\substitute_shape#1#2#3#4{
   \edef\orig_shape{#4}
   \substitute_series{#1}{#2}{#3}{\orig_shape}
   \x_cs\ifx{sub-\orig_shape}\x_relax\else
      \edef\subst_shape{\csname sub-\orig_shape\endcsname}
      \x_cs\ifx{#1-#2-#3-\subst_shape}\x_relax
         \out_line{
            \string\DeclareFontShape{#1}{#2}{#3}{\subst_shape}{
               <->\csname typ-\orig_shape\endcsname\space 
               *~#2/#3/\orig_shape
            }{}
         }
         \x_cs\let{#1-#2-#3-\subst_shape}\empty_command
         \substitute_shape{#1}{#2}{#3}{\subst_shape}
      \fi
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\substitute_series}
%    |\substitute_series{ENCODING}{FAMILY}{SERIES}{SHAPE}|
%
%    \begin{macrocode}
\def\substitute_series#1#2#3#4{
   \edef\orig_series{#3}
   \x_cs\ifx{sub-\orig_series}\x_relax\else
      \edef\subst_series{\csname sub-\orig_series\endcsname}
      \x_cs\ifx{#1-#2-\subst_series-#4}\x_relax
         \out_line{
            \string\DeclareFontShape{#1}{#2}{\subst_series}{#4}{
               <->\csname typ-\orig_series\endcsname\space 
               *~#2/\orig_series/#4
            }{}
         }
         \x_cs\let{#1-#2-\subst_series-#4}\empty_command
         \substitute_series{#1}{#2}{\subst_series}{#4}
      \fi
   \fi
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\substitutesilent}
% \begin{macro}{\substitutenoisy}
%    |\substitutesilent{TO}{FROM}|\\
%    |\substitutenoisy{TO}{FROM}|
%
% Specifies a default substitution for family or shape |TO|,
% which is substituted by family or shape |FROM|.
%
%    \begin{macrocode}
\def\substitutesilent#1#2{
   \x_cs\def{sub-#2}{#1}
   \x_cs\def{typ-#2}{ssub}
}
\def\substitutenoisy#1#2{
   \x_cs\def{sub-#2}{#1}
   \x_cs\def{typ-#2}{sub}
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%    \begin{macrocode}
\substitutesilent{bx}{b}
\substitutesilent{b}{bx}
\substitutesilent{b}{sb}
\substitutesilent{b}{db}
\substitutesilent{m}{mb}
\substitutesilent{m}{l}
%    \end{macrocode}
%    \begin{macrocode}
\substitutenoisy{ui}{it}
%    \end{macrocode}
%
% I don't think we want these since in OT1 encoding it will
% cause the old |<sterling>| vs |<dollar>| problem. (ASAJ)
% --- Oh yes we do. (SPQR)
%
%    \begin{macrocode}
\substitutesilent{sl}{it}
\substitutesilent{it}{sl}
%    \end{macrocode}
%
% 
% \subsection{The font substitution mechanism}
% 
% \textbf{Note:} This subsection contains (part of) a new implementation 
% of the font substitution mechanism, but it is uncertain whether it 
% will ever be completed.
%    \begin{macrocode}
%<*underconstruction>
%    \end{macrocode}
% 
% 
% \subsubsection{The substitution graph}
% 
% Which substitutions are performed are determined by the substitution 
% graph. The vertices of this graph are all combinations of a series and 
% a shape. The arcs (directed edges) of this graph are the substitutions 
% that can be made. Each arc has a wheight---a real number in the range 
% $[0,1]$---that describes how much of the quality of the font that is 
% preserved with this substitution.
% 
% As an example, consider the case that there is an arc from \texttt{m/it} 
% to \texttt{m/sl} and that the wheight of this arc is $0.5$. This means 
% that it is OK to substitute the medium italic (\texttt{m/it}) font as a 
% medium slanted (\texttt{m/sl}) font if there is no medium slanted font, 
% but that the medium italic font is only considered as being half 
% ($0.5$) as good a medium slanted font as it is a medium italic font.
% 
% The main problem the substitution mechanism has to solve in this 
% context is to find the best possible way of substituting a font, given 
% the real fonts which has actually been installed (using |\installfont| 
% or |\installrawfont|). The solution to this problem is computed by a 
% brute force approach---all possible substitution paths are followed 
% and during this process the best solution so far, for each vertex 
% separately, is stored.
% \medskip
% 
% In practice, the substitution graph $G$ is constructed as the cartesian 
% product of one graph $G\sb{1}$ of series substitutions and one graph 
% $G\sb{2}$ of shape substitutions, with the option of adding some 
% additional arcs to this product. The reason for this is that one 
% usually wants to make the same shape substitutions in all series and 
% vice versa, so by only storing the $G\sb{1}$ and $G\sb{2}$ graphs, plus 
% perhaps a handfull of extra edges, one gets away with using fewer 
% tokens.
% The wheights of the arcs are stored as integers in the range 0--1000, 
% where 0 means the real number $0$ and 1000 means the real number $1$. 
% \medskip
% 
% \DescribeMacro\do_arc
% The |\do_arc| macro is probably the most common in the data 
% structures that constitute the substitution graph. Its syntax is 
% always
% \begin{quote}
%   |\do_arc|\marg{series}\marg{shape}\marg{wheight}
% \end{quote}
% but it is meant to be redefined whenever one needs to do something 
% ``for all arcs'' (usually all arcs at a given vertex or so). There are 
% three families of macros which consist of |\do_arc| lists, namely
% \begin{quote}
%   |\sub1-|\meta{series}\\
%   |\sub2-|\meta{shape}\\
%   |\sub-|\meta{series}|-|\meta{shape}
% \end{quote}
% These macros store arcs going out from a vertex. The 
% |\sub1-|\meta{series} macross store the arcs incident with the vertex 
% \meta{series} in the series substitution graph $G\sb{1}$. The 
% |\sub2-|\meta{shape} macros store the arcs incident with the vertex 
% \meta{shape} in the shape substitution graph $G\sb{2}$. The 
% |\sub-|\meta{series}|-|\meta{shape} macros store the arcs of $G$ that 
% are incident with the vertex \meta{series}|/|\meta{shape} but do 
% \emph{not} appear in the cartesian product $G\sb{1} \times G\sb{2}$.
% 
% The \meta{series} and \meta{shape} arguments of |\do_arc| tells which 
% vertex the arc goes to, hence for example |\do_arc{b}{it}{600}| in the 
% macro |\sub-db-sl| corresponds to an arc going from the |db/sl| vertex 
% to the |b/it| vertex and having a wheight of $0.6$.
% 
% \DescribeMacro\curr_series
% \DescribeMacro\curr_shape
% The above omits one important detail, namely that the \meta{shape} 
% argument for a |\do_arc| in a |\sub1-|\textellipsis\ must be able to 
% be \emph{all} shapes since the shape is not determined for arcs in 
% $G\sb{1}$ and the series is likewise for arcs in $G\sb{2}$. To make things 
% work anyway, there are two macros |\curr_series| and |\curr_shape| 
% which contain this missing information. Furthermore, a |\do_arc| item 
% for an arc in $G\sb{1}$ will always have the structure
% \begin{quote}
%   |\do_arc|\marg{series}|\curr_shape|\marg{wheight}
% \end{quote}
% and a |\do_arc| item for an arc in $G\sb{2}$ will have the structure
% \begin{quote}
%   |\do_arc\curr_series|\marg{shape}\marg{wheight}
% \end{quote}
% 
% 
% \begin{macro}{\substituteshape}
% \begin{macro}{\substituteseries}
% \begin{macro}{\substituteseriesshape}
%   |\substituteshape|\marg{to}\marg{from}\marg{wheight}\\
%   |\substituteseries|\marg{to}\marg{from}\marg{wheight}\\
%   |\substituteseriesshape|\marg{toseries}\marg{toshape}^^A
%   \marg{fromseries}\marg{fromshape}\marg{wheight}
%   
%    \begin{macrocode}
\def\substituteshape#1#2#3{
   \round_wheight{#3}
   \edef\temp_command{#1}
   \edef\sub_suffix{#2}
   \ifx \temp_command\sub_suffix \else
      \def\sub_suffix##1##2{2-##2}
      \def\do_arc##1##2##3{
         \x_cs\ifx{sub2-##2}R \else
            \noexpand\do_arc\noexpand\curr_series{##2}{##3}
         \fi
      }
      \update_do_arc_list{}{#2}{}{#1}{\noexpand\curr_series{#1}}
   \fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\substituteseries#1#2#3{
   \round_wheight{#3}
   \edef\temp_command{#1}
   \edef\sub_suffix{#2}
   \ifx \temp_command\sub_suffix \else
      \def\sub_suffix##1##2{1-##1}
      \def\do_arc##1##2##3{
         \x_cs\ifx{sub1-##1}R \else
            \noexpand\do_arc{##1}\noexpand\curr_shape{##3}
         \fi
      }
      \update_do_arc_list{#2}{}{#1}{}{{#1}\noexpand\curr_shape}
   \fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\substituteseriesshape#1#2#3#4#5{
   \round_wheight{#5}
   \edef\temp_command{#1-#2}
   \edef\sub_suffix{#3-#4}
   \ifx \temp_command\sub_suffix \else
      \def\sub_suffix##1##2{-##1-##2}
      \def\do_arc##1##2##3{
         \x_cs\ifx{sub-##1-##2}R \else
            \noexpand\do_arc{##1}{##2}{##3}
         \fi
      }
      \update_do_arc_list{#3}{#4}{#1}{#2}{{#1}{#2}}
   \fi
}
%    \end{macrocode}
%    \begin{macrocode}
\def\round_wheight#1{
   \eval_expr{#1}
   \ifnum \one_thousand<\result
      \result=\one_thousand
   \else \ifnum 0>\result
      \result=\z@
   \fi\fi
}
%    \end{macrocode}
%   
%   |\update_do_arc_list|\marg{update-series}\marg{update-shape}^^A
%   \allowbreak\marg{tag-series}\allowbreak\marg{tag-shape}^^A
%   \allowbreak\marg{inserted series+shape}
%   
%    \begin{macrocode}
\def\update_do_arc_list#1#2#3#4#5{
   \bgroup
      \edef\temp_command{sub\sub_suffix{#1}{#2}}
      \x_cs\let{sub\sub_suffix{#3}{#4}}=R
      \x_cs\xdef\temp_command{
         \x_cs\ifx\temp_command\relax \else
            \csname\temp_command\endcsname
         \fi
         \ifnum 0<\result
            \noexpand\do_arc #5{\the\result}
         \fi
      }
   \egroup
}
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% 
%  
% 
% \begin{macro}{\substitutesilent}
% \begin{macro}{\substitutenoisy}
%    |\substitutesilent{TO}{FROM}|\\
%    |\substitutenoisy{TO}{FROM}|
%
% Specifies a default substitution for family or shape |TO|,
% which is substituted by family or shape |FROM|.
%
%    \begin{macrocode}
\def\substitutesilent#1#2{
   \substituteseries{#1}{#2}{900}
   \substituteshape{#1}{#2}{900}
}
\def\substitutenoisy#1#2{
   \substituteseries{#1}{#2}{500}
   \substituteshape{#1}{#2}{500}
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%    \begin{macrocode}
\a_count=900 % Silent substitution wheight
\b_count=500 % Noisy substitution wheight
\substituteseries{bx}{b}{\a_count}
\substituteseries{b}{bx}{\a_count}
\substituteseries{b}{sb}{\a_count}
\substituteseries{b}{db}{\a_count}
\substituteseries{m}{mb}{\a_count}
\substituteseries{m}{l}{\a_count}
%    \end{macrocode}
%    \begin{macrocode}
\substituteshape{ui}{it}{\b_count}
%    \end{macrocode}
%
% I don't think we want these since in OT1 encoding it will
% cause the old |<sterling>| vs |<dollar>| problem. (ASAJ)
% --- Oh yes we do. (SPQR)
%
%    \begin{macrocode}
\substituteshape{sl}{it}{\a_count}
\substituteshape{it}{sl}{\a_count}
%    \end{macrocode}
%
% 
% \subsubsection{Listing reachable vertices}
% 
% While determining the optimal substitutions, there is a need to store 
% some---more or less temporary---information for each vertex. Such 
% information will be called a \emph{property} of the vertex and it is 
% stored in the |\v-|\meta{series}|-|\meta{shape} family of macros.
% 
% The following are the basic properties:
% \begin{list}{}{^^A
%   ^^A How does one make the label go on a line of its own??
% }
%   \item[\cs{real_font}\marg{quality}]
%     This expresses that this vertex corresponds to a font that has 
%     actually been installed with a nominal quality of \meta{quality}.
%   \item[\cs{subs_font}\marg{series}\marg{shape}\marg{quality}]
%     This expresses that this vertex corresponds to a font for which 
%     the font \meta{series}|/|\meta{shape} has been substituted. 
%     \meta{quality} is the quality this substitution is considered to 
%     have.
%   \item
% \end{list}
% 
% 
% There will also be some lists of vertices. These will consist of simple 
% |\do|\marg{series}\marg{shape} triples.
% 
%    \begin{macrocode}
\def\list_subs_vertices{
   \def\subs_vertex_list{}
   \let\do_arc=\subs_do_arc
   \let\do=\never_do
   \def\real_font##1{\c_count=\@MM}
   \def\subs_font##1##2##3{\c_count=##3\relax}
   \real_vertex_list
}
\def\subs_do_arc#1#2#3{
   \b_count=#3
   \multiply \b_count \a_count
   \divide \b_count \one_thousand
   \c_count=-\max_mathchardef
   \csname v-#1-#2\endcsname
   \ifnum \c_count<\b_count
      \ifnum \c_count=-\max_mathchardef
         \edef\subs_vertex_list{\subs_vertex_list\do{#1}{#2}}
      \fi
      \x_cs\edef{v-#1-#2}{\noexpand\subs_font{\subs_series}
         {\subs_shape}{\the\b_count}}
      \toks_a=\expandafter{\the\a_toks \do_subs{#1}{#2}}
   \fi
}
\def\do_subs#1#2{
   \edef\curr_series{#1}
   \edef\curr_shape{#2}
   \csname v-#1-#2\endcsname
   \a_count=\c_count
   \a_toks={}
   \csname sub-#1-#2\endcsname
   \csname sub1-#1\endcsname
   \csname sub2-#2\endcsname
   \the\a_toks
}
\def\start_subs_at#1#2{
   \edef\subs_series{#1} \let\curr_series=\subs_series
   \edef\subs_shape{#2}  \let\curr_shape=\subs_shape
   \a_count=\x_cs\second_of_two{v-#1-#2}
   \a_toks={}
   \csname sub-#1-#2\endcsname
   \csname sub1-#1\endcsname
   \csname sub2-#2\endcsname
   \the\a_toks
}
%    \end{macrocode}
% 
%
%    \begin{macrocode}
%</underconstruction>
%    \end{macrocode}
% 
%
% \subsection{Default encodings and font sizes}
%
% \begin{macro}{\declareencoding}
%    |\declareencoding{CODINGSCHEME}{ENCODING}|
%
% Declare a macro |\enc-CODINGSCHEME| which expands to |ENCODING|.
% This is used to determine the encoding in |\pltomtx|.
% \changes{1.927}{2004/07/31}{Lowercased encoding file names. (LH)}
%
%    \begin{macrocode}
\def\declareencoding#1#2{\x_cs\edef{enc-#1}{#2}}
%    \end{macrocode}
% \end{macro}
%
% Old \TeX{} text font encodings.
%    \begin{macrocode}
\declareencoding{TEX~TEXT}{ot1}
\declareencoding{TEX~TEXT~WITHOUT~F-LIGATURES}{ot1}
\declareencoding{TEX~TYPEWRITER~TEXT}{ot1tt}
%    \end{macrocode}
%
% Old \TeX{} math font encodings.
%    \begin{macrocode}
\declareencoding{TEX~MATH~ITALIC}{oml}
\declareencoding{TEX~MATH~SYMBOLS}{oms}
\declareencoding{TEX~MATH~EXTENSION}{omx}
\declareencoding{LATEX~SYMBOLS}{lasy}
%    \end{macrocode}
%
% Euler math font encodings.
%    \begin{macrocode}
\declareencoding{TEX~TEXT~SUBSET}{eufrak}
\declareencoding{TEX~MATH~ITALIC~SUBSET}{eurm}
\declareencoding{TEX~MATH~SYMBOLS~SUBSET}{euscr}
\declareencoding{EULER~SUBSTITUTIONS~ONLY}{euex}
%    \end{macrocode}
%
% New \TeX{} text font encodings.
%    \begin{macrocode}
\declareencoding{EXTENDED~TEX~FONT~ENCODING~-~LATIN}{t1}
\declareencoding{TEX~TEXT~COMPANION~SYMBOLS~1---TS1}{ts1}
%    \end{macrocode}
%
% Rencoded PostScript font encdings.
%    \begin{macrocode}
\declareencoding{TEXBASE1ENCODING}{8r}
\declareencoding{TEX~TYPEWRITER~AND~WINDOWS~ANSI}{8y}
%    \end{macrocode}
%
% \begin{macro}{\declaresize}
%    |\declaresize{FONTSIZE}{LATEXSIZE}|
%
%    \begin{macrocode}
\def\declaresize#1#2{\x_cs\edef{siz-#1}{#2}}
%    \end{macrocode}
% \end{macro}
%
% Default sizes.  An empty size argument is equivalent to |<->|,
% for use with scalable fonts.
%
%    \begin{macrocode}
\declaresize{}{<->}
\declaresize{5}{<5>}
\declaresize{6}{<6>}
\declaresize{7}{<7>}
\declaresize{8}{<8>}
\declaresize{9}{<9>}
\declaresize{10}{<10>}
\declaresize{11}{<10.95>}
\declaresize{12}{<12>}
\declaresize{14}{<14.4>}
\declaresize{17}{<17.28>}
\declaresize{20}{<20.74>}
\declaresize{25}{<24.88>}
%    \end{macrocode}
%
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \section{Debugging}
%
% \begin{macro}{\NOFILES}
%   |\NOFILES| switches off file generation, and causes 
%   \package{fontinst} to only generate empty files. It only affects the 
%   user level commands, so it is primarily of use when debugging 
%   commands that build on these, such as for example the 
%   |\latin|\-|family| command.
%   \changes{1.914}{2000/05/20}{Added \cs{reglyphfont}. (LH)}
%    \begin{macrocode}
\def\NOFILES{
   \def\transformfont##1##2{
      \touch_file{##1.mtx}
      \touch_file{##1.pl}
   }
   \def\reglyphfont##1##2{\touch_file{##1.mtx}}
   \def\installfonts{}
   \def\endinstallfonts{}
   \def\installfont##1##2##3##4##5##6##7##8{
      \touch_file{##1.vpl}
   }
   \def\installrawfont##1##2##3##4##5##6##7##8{
      \touch_file{##1.pl}
   }
   \def\installfamily##1##2##3{\touch_file{##1##2.fd}}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\touch_file}
%    \begin{macrocode}
\def\touch_file#1{
   \edef\lowercase_file{\lowercase{
     \edef\noexpand\lowercase_file{#1}}}
   \lowercase_file
   \open_out{\lowercase_file}
   \out_line{\percent_char~TEST~FILE.}
   \out_line{\percent_char~Created~whilst~debugging~fontinst.}
   \close_out{Test~file}
}
%</pkg>
%    \end{macrocode}
% \end{macro}
%
% \Finale
\endinput