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-rw-r--r--luaotfload.dtx129
1 files changed, 79 insertions, 50 deletions
diff --git a/luaotfload.dtx b/luaotfload.dtx
index 3f5d59d..fae456b 100644
--- a/luaotfload.dtx
+++ b/luaotfload.dtx
@@ -102,7 +102,7 @@ and the derived files
\ProvidesFile{luaotfload.drv}%
[2010/04/01 v1.07 ConTeXt font loading system]%
\documentclass{ltxdoc}
-\usepackage{metalogo}
+\usepackage{metalogo,multicol,mdwlist}
\usepackage[colorlinks=true]{hyperref}
\def\LuaTeX{Lua\TeX}
@@ -138,13 +138,14 @@ and the derived files
%
% \title{The \textsf{luaotfload} package}
% \date{2010/04/01 v1.07}
-% \author{Elie Roux \\ \texttt{elie.roux@telecom-bretagne.eu}}
+% \author{ Elie Roux \footnote{\texttt{elie.roux@telecom-bretagne.eu}}
+% \and Khaled hosny \footnote{\texttt{khaledhosny@eglug.org}}}
%
% \maketitle
%
% \begin{abstract}
-% \ConTeXt font loading system, providing the possibility to load OTF fonts
-% with a lot of features, and the \XeTeX\ font loading syntax.
+% \ConTeXt\ font loading system, providing the possibility to load OTF fonts
+% with a lot of features, and extended font loading syntax.
% \end{abstract}
%
% \tableofcontents
@@ -154,10 +155,10 @@ and the derived files
% \subsection{Introduction}
%
% Font management and installation has always been painful with \TeX\ (and
-% even more with \LaTeX ). A lot of files are needed for one font (tfm, pfb,
+% even more with \LaTeX). A lot of files are needed for one font (tfm, pfb,
% map, fd, vf), and they are limited to 256 characters. But the font world has
% evolved since, and new standard types of fonts have appeared, like
-% \textsf{truetype} or \textsf{opentype} fonts. These fonts can contain a lot
+% \textsf{TrueType} and \textsf{OpenType} fonts. These fonts can contain a lot
% of characters, and have some functionalities (ligatures, old-style numbers,
% small capitals, etc.). They are everywhere, as the system fonts and most
% modern text softwares fonts are of this type. Until now the (almost) only
@@ -174,55 +175,81 @@ and the derived files
%
% \subsection{Loading fonts}
%
-% \textsf{luaotfload} supports \XeTeX -like font syntax which looks like:
+% \textsf{luaotfload} supports an extended font loading syntax which looks like:
%
% \begin{center}
-% |\font\foo="|\meta{prefix}|:|\meta{font name}|:|\meta{font features}|"| \meta{\TeX\ font features}
+% |\font\foo={|\meta{prefix}|:|\meta{font name}|:|\meta{font features}|}| \meta{\TeX\ font features}
% \end{center}
%
-% \subsubsection{Prefix}
+% The curly brackets are optional and are used for escaping spaces in font names
+% (\XeTeX-like double quotes can also used for the same purpose).
%
-% Prefixes are either |file| or |name|; |file| prefix forces searching font
-% based on filename, while a |name| prefix will result in consulting name
-% database. Name database can be generated with |mkluatexfontdb.lua| script
-% shipped with \textsf{luaotfload}, run |mkluatexfontdb.lua --help| for more
-% details.
+% \paragraph{Prefix}
%
-% \subsubsection{Font name}
+% Can be either \texttt{file:} or \texttt{name:} and are used to select between filename based
+% or font name based search mechanisms.
+% Loading fonts based on filename is restricted to files found by \textsf{kpathsea}
+% (typically in the \textsc{texmf} tree). Surrounding font name with square
+% brackets is synonym to using \texttt{file:} prefix (for compatibility with \XeTeX).
+% This is usually used for loading old \textsc{tfm} fonts.
+% Accessing fonts by fontname allows loading system installed fonts as well as
+% \textsc{texmf} ones, and requires a font names database that can be generated
+% using the bundled |mkluatexfontdb.lua| script.
+% \footnote{run |mkluatexfontdb.lua --help| for help and usage information}
%
-% Font name can be either a font filename or actual font name. If no prefix is
-% specified; it is assumed to be a filename. \XeTeX-like syntax of using square
-% brackets to select fonts from \textsc{texmf} tree is olso supported;
-% |\font\foo=[foo.ttf]:+liga|.
+% If no prefix is specified, then \texttt{file:} is assumed.
%
-% \subsubsection{Font features}
+% \paragraph{Font name}
%
-% By default \textsf{luaotfload} doesn't enable any font features, font features
-% must be explicitly enabled, |\font\foo=foo.ttf:+liga| will load |foo.ttf| font
-% and enable \texttt{liga} feature. In the same way font features can be
-% deactivated by prefixing it with minus sign; |\font\foo=foo.ttf:+liga;-liga|
-% will load \texttt{foo.ttf} without any features enabled.
+% Font name can be either a font filename or actual font name; based on the
+% prefix specified.
%
-% \paragraph{Modes}
+% \paragraph{Font features}
+%
+% Font are a semicolon separated list of items, which are either font parameters
+% in the form of |key=value|, or switches to enable/disable certain font
+% features, in the form of |+feat|/|-feat|.
+% The supported parameters are:
+% \begin{description}
+% \item [mode] \hfill \\
% \textsf{luaotfload} has two OpenType processing modes; \texttt{base} mode
-% which enables only a subset of OpenType features and works by mapping those
-% features to traditional TeX ligaturing and kerning mechanisms and is a bit
+% which supports only a subset of OpenType features and works by mapping those
+% features to traditional \TeX\ ligaturing and kerning mechanisms and is a bit
% faster, and \texttt{node} mode which, hopefully, supports OpenType fully and
% works by direct processing of node list at lua end and is a bit slower.
-% Note that, nside math mode only \texttt{base} is supported.
+% Note that \texttt{node} mode doesn't work inside math. By default,
+% \texttt{base} mode is used.
+%
+% \item [script] \hfill \\ OpenType script string, default value is |dflt|.
+%
+% \item [language] \hfill \\ OpenType language string, default value is |latn|.
+%
+% \item [featurefile] \hfill \\
+% feature files are textual representation of OpenType tables and can be used to
+% extend OpenType features of the font on fly. The file name of the feature file
+% is passed, then features defined in the file can be enabled/disabled like any
+% other feature. The actual syntax is described at
+% \url{http://fontforge.sourceforge.net/featurefile.html} and
+% \url{http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html}.
+%
+% \item [color] \hfill \\
+% font color, defined as a triplet of two-digit Hex RGB values, with optionally
+% another value for the transparency (where |00| is completely transparent and
+% |FF| is opaque.)
%
-% Modes can be selected using \texttt{mode} keyword and it must come before any
-% other font feature, e.g. |\font\foo=foo.ttf:mode=node;+liga|.
+% \item [protrosion] \hfill \\ TODO
+% \item [expansion] \hfill \\ TODO
+% \end{description}
%
-% \paragraph{Additional font features}
+% \subparagraph{Additional font features}
% \textsf{luaotfload} defines some additional font feature not defined in
% OpenType, currently three features are defined:
%
-% \begin{itemize}
-% \item[-] \texttt{anum}: Arabic numbers
-% \item[-] \texttt{tlig}: \TeX\ ligatures
-% \item[-] \texttt{trep}: \TeX\ replacements
-% \end{itemize}
+% \begin{itemize*}
+% \item \texttt{anum}: replaces European numbers with eastern Arabic numbers.
+% \item \texttt{tlig}: applies legacy \TeX\ ligatures (|``''-- -- !` ?` <<>>|).
+% \item \texttt{trep}: applies legacy \TeX\ replacements (|`'"|).
+% \end{itemize*}
%
% \subsubsection{Examples}
% \begin{verbatim}
@@ -235,20 +262,21 @@ and the derived files
% \font\testf=[lmroman12-regular] at 40pt \testf more text
% \end{verbatim}
%
-% \subsection{\ConTeXt files needed}
+% \subsection{\ConTeXt\ files needed}
%
-% This package is a wrapper for several files taken from the \ConTeXt macro
-% package. The philosophy is to let \ConTeXt do all the implementation and
+% This package is a wrapper for several files taken from the \ConTeXt\ macro
+% package. The philosophy is to let \ConTeXt\ do all the implementation and
% update these files from time to time. To do so we did not modify the files
% taken from \ConTeXt, we only changed their names to prevent name clashes.
% You can thus update the font system of this package simply by updating the
-% files taken from \ConTeXt, without (theorically) changing the \texttt{.sty}
+% files taken from \ConTeXt, without (theoretically) changing the \texttt{.sty}
% file nor the main \texttt{.lua} file.
%
-% The \ConTeXt files are renamed by adding the prefix \texttt{otfl-} to them
+% The \ConTeXt\ files are renamed by adding the prefix \texttt{otfl-} to them
% (\texttt{otfl} as \texttt{OTF L}oad).The files are:
%
-% \begin{itemize}
+% \begin{multicols}{3}
+% \begin{itemize*}
% \item \texttt{luat-dum.lua}
% \item \texttt{data-con.lua}
% \item \texttt{node-ini.lua}
@@ -270,7 +298,8 @@ and the derived files
% \item \texttt{font-xtx.lua}
% \item \texttt{font-map.lua}
% \item \texttt{font-dum.lua}
-% \end{itemize}
+% \end{itemize*}
+% \end{multicols}
%
% \subsection{Troubleshooting}
%
@@ -317,8 +346,8 @@ end
% \end{macrocode}
%
-% We load the \ConTeXt files with this function. It automatically adds the
-% \texttt{otfl-} prefix to it, so that we call it with the actual \ConTeXt
+% We load the \ConTeXt\ files with this function. It automatically adds the
+% \texttt{otfl-} prefix to it, so that we call it with the actual \ConTeXt\
% name.
%
% \begin{macrocode}
@@ -336,7 +365,7 @@ end
% \end{macrocode}
%
-% The following functions are made to map \ConTeXt functions to
+% The following functions are made to map \ConTeXt\ functions to
% \textsf{luaextra} functions.
%
% \begin{macrocode}
@@ -411,8 +440,8 @@ end
% \end{macrocode}
%
% We start loading some lua files. These two are some code not used by
-% \ConTeXt at all that allow other modules to be used, it provides some
-% low-level \ConTeXt functions.
+% \ConTeXt\ at all that allow other modules to be used, it provides some
+% low-level \ConTeXt\ functions.
%
% \begin{macrocode}
@@ -430,7 +459,7 @@ luaotfload.loadmodule('node-ini.lua')
% \end{macrocode}
%
-% By default \ConTeXt takes some private attributes for internal use. With
+% By default \ConTeXt\ takes some private attributes for internal use. With
% Plain and \LaTeX\ we can't do so, we use |\newluaattribute|. This
% functions overrides a function defined in the previous module that
% returns the number of a private attribute. We allocate new attributes in