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|
% \iffalse meta-comment
%
%% File: l3keys2e.dtx (C) Copyright 2009,2011,2012 The LaTeX3 Project
%%
%% It may be distributed and/or modified under the conditions of the
%% LaTeX Project Public License (LPPL), either version 1.3c of this
%% license or (at your option) any later version. The latest version
%% of this license is in the file
%%
%% http://www.latex-project.org/lppl.txt
%%
%% This file is part of the "l3packages bundle" (The Work in LPPL)
%% and all files in that bundle must be distributed together.
%%
%% The released version of this bundle is available from CTAN.
%%
%% -----------------------------------------------------------------------
%%
%% The development version of the bundle can be found at
%%
%% http://www.latex-project.org/svnroot/experimental/trunk/
%%
%% for those people who are interested.
%%
%%%%%%%%%%%
%% NOTE: %%
%%%%%%%%%%%
%%
%% Snapshots taken from the repository represent work in progress and may
%% not work or may contain conflicting material! We therefore ask
%% people _not_ to put them into distributions, archives, etc. without
%% prior consultation with the LaTeX Project Team.
%%
%% -----------------------------------------------------------------------
%%
%
%<*driver|package>
% The version of expl3 required is tested as early as possible, as
% some really old versions do not define \ProvidesExplPackage.
\RequirePackage{expl3}[2012/02/08]
%<package>\@ifpackagelater{expl3}{2012/02/08}
%<package> {}
%<package> {
%<package> \PackageError{l3keys2e}{Support package l3kernel too old.}
%<package> {
%<package> Please install an up to date version of l3kernel
%<package> using your TeX package manager or from CTAN.\\ \\
%<package> Loading l3keys2e will abort!
%<package> }
%<package> \endinput
%<package> }
\RequirePackage{xparse}
\GetIdInfo$Id: l3keys2e.dtx 3342 2012-02-08 19:34:51Z joseph $
{LaTeX2e option processing using LaTeX3 keys}
%</driver|package>
%<*driver>
\documentclass[full]{l3doc}
\usepackage{amstext}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \textsf{l3keys2e} package\\
% \LaTeXe{} option processing using \LaTeX3 keys^^A
% \thanks{This file describes v\ExplFileVersion,
% last revised \ExplFileDate.}^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released \ExplFileDate}
%
% \maketitle
%
% \begin{documentation}
%
% The key--value method for optional arguments is very popular, as it
% allows the class or package author to define a large number of
% options with a simple interface. The \pkg{expl3} bundle of \LaTeX3
% base code includes the module \pkg{l3keys} for defining keys, but
% to use these when loading \LaTeXe\ packages and classes requires
% extra support. That support is provided by this small package, which
% is intended to enable \LaTeXe\ packages to benefit from the power of
% the \LaTeX3 key--value system.
%
% \subsection{Creating and using keyval options}
%
% As with any key--value input, using key--value pairs as package or
% class options has two parts. The first stage is to define one or
% more keys, using the \cs{keys_define:nn} function. For example, an
% option which simply stores a value would be created using:
% \begin{verbatim}
% \keys_define:nn { module }
% { option .set:N = \l_module_variable_tl }
% \end{verbatim}
% On its own, this will not make the key an option for the package or
% class containing the definition. The second stage is therefore to
% process the current options, searching for applicable keys.
%
% \begin{function}{\ProcessKeysOptions}
% \begin{syntax}
% \cs{ProcessKeysOptions} \Arg{module}
% \end{syntax}
% The \cs{ProcessKeysOptions} function is used to check the current
% option list against the keys defined for \Arg{module}. Global (class)
% options and local (package) options are checked when this function
% is called in a package. Each option which does match a key name is
% then used to attempt to set the appropriate key using
% \cs{keys_set:nn}. For example, the option defined earlier would be
% processed by the line
% \begin{verbatim}
% \ProcessKeysOptions { module }
% \end{verbatim}
% \end{function}
%
% \begin{function}{\ProcessKeysPackageOptions}
% \begin{syntax}
% \cs{ProcessKeysPackageOptions} \Arg{module}
% \end{syntax}
% This function works in a similar manner to \cs{ProcessKeysOptions}.
% When used in a \LaTeXe{} package, \cs{ProcessKeysPackageOptions}
% will not examine any class options available. In contrast,
% \cs{ProcessKeysOptions} does parse class options (in common with the
% \LaTeXe{} kernel function \cs{ProcessOptions}).
% \end{function}
%
%\end{documentation}
%
%\begin{implementation}
%
%\subsection{\pkg{l3keys2e} Implementation}
%
% \begin{macrocode}
%<*package>
% \end{macrocode}
%
% \begin{macrocode}
\ProvidesExplPackage
{\ExplFileName}{\ExplFileDate}{\ExplFileVersion}{\ExplFileDescription}
% \end{macrocode}
%
% \begin{macro}{\keys_latexe_options_clist}
% A single list is used for all options, into which they are collected
% before processing.
% \begin{macrocode}
\clist_new:N \keys_latexe_options_clist
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\_l_keys_process_class_bool}
% A flag to indicate that class options should be processed for
% packages.
% \begin{macrocode}
\bool_new:N \_l_keys_process_class_bool
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\keys_latexe_options:n}
% The main function calls functions to collect up the global and local
% options into \cs{keys_latexe_options_clist} before calling the
% underlying functions to actually do the processing. So that a suitable
% message is produced if the option is unknown, the special
% \texttt{unknown} key is set if it does not already exist for the
% current module.
% \begin{macrocode}
\cs_new_protected:Npn \keys_latexe_options:n #1
{
\clist_clear:N \keys_latexe_options_clist
\keys_latexe_options_global:n {#1}
\keys_latexe_options_local:
\keys_if_exist:nnF {#1} { unknown }
{
\keys_define:nn {#1}
{
unknown .code:n =
{
\msg_error:nnxx { keyvalue } { option-unknown }
{ \l_keys_key_tl } { \@currname }
}
}
}
\keys_set:nV {#1} \keys_latexe_options_clist
\AtEndOfPackage { \cs_set_eq:NN \@unprocessedoptions \scan_stop: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\keys_latexe_options_global:n}
% Global (class) options are handled differently for \LaTeXe{} packages
% and classes. Hence this function is essentially a check on the current
% file type. The initial test is needed as \LaTeXe{} allows variables to
% be equal to \cs{scan_stop:}, which is forbidden in \LaTeX3 code.
% \begin{macrocode}
\cs_new_protected:Npn \keys_latexe_options_global:n #1
{
\cs_if_eq:NNF \@classoptionslist \scan_stop:
{
\cs_if_eq:NNTF \@currext \@clsextension
{ \keys_latexe_options_class:n {#1} }
{
\bool_if:NT \_l_keys_process_class_bool
{ \keys_latexe_options_package:n {#1} }
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\keys_latexe_options_class:n}
% For classes, each option (stripped of any content after |=|)
% is checked for existence as a key. If found, the option is added to
% the combined list for processing. On the other hand, unused options
% are stored up in \cs{@unusedoptionlist}. Before any of that, though,
% there is a simple check to see if there is an |unknown| key. If there
% is, then \emph{everything} will match and the mapping can be skipped.
% \begin{macrocode}
\cs_new_protected:Npn \keys_latexe_options_class:n #1
{
\keys_if_exist:nnTF {#1} { unknown }
{ \clist_put_right:No \keys_latexe_options_clist \@classoptionslist }
{
\clist_map_inline:Nn \@classoptionslist
{
\keys_if_exist:nnTF {#1} { \keys_latexe_remove_equals:n {##1} }
{ \clist_put_right:Nn \keys_latexe_options_clist {##1} }
{ \clist_put_right:Nn \@unusedoptionlist {##1} }
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\keys_latexe_options_package:n}
% For global options when processing a package, the tasks are slightly
% different from those for a class. The check is the same, but here
% there is nothing to do if the option is not applicable. Each valid
% option also needs to be removed from \cs{@unusedoptionlist}.
% \begin{macrocode}
\cs_new_protected:Npn \keys_latexe_options_package:n #1
{
\clist_map_inline:Nn \@classoptionslist
{
\keys_if_exist:nnT {#1} { \keys_latexe_remove_equals:n {##1} }
{
\clist_put_right:Nn \keys_latexe_options_clist {##1}
\clist_remove_all:Nn \@unusedoptionlist {##1}
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\keys_latexe_options_local:}
% If local options are found, the are added to the processing list.
% \LaTeXe{} stores options for each file in a macro which may or may not
% exist, hence the need to use \cs{cs_if_exist:c}.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \keys_latexe_options_local:
{
\cs_if_eq:NNF \@currext \@clsextension
{
\cs_if_exist:cT { opt@ \@currname . \@currext }
{
\exp_args:NNc \clist_put_right:NV \keys_latexe_options_clist
{ opt@ \@currname . \@currext }
}
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\keys_latexe_remove_equals:n}
% \begin{macro}{\keys_latexe_remove_equals:w}
% As the name suggests, this is a simple function to remove an equals
% sign from the input. This is all wrapped up in an \texttt{n} function
% so that there will always be a sign available.
% \begin{macrocode}
\cs_new:Npn \keys_latexe_remove_equals:n #1
{ \keys_latexe_remove_equals:w #1 = \q_stop }
\cs_new:Npn \keys_latexe_remove_equals:w #1 = #2 \q_stop {#1}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ProcessKeysOptions}
% \begin{macro}{\ProcessKeysOptions}
% The user macro are simply wrappers around the internal process. In
% contrast to other similar packages, the module name is always required
% here.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \ProcessKeysOptions #1
{
\bool_set_true:N \_l_keys_process_class_bool
\keys_latexe_options:n {#1}
}
\cs_new_protected_nopar:Npn \ProcessKeysPackageOptions #1
{
\bool_set_false:N \_l_keys_process_class_bool
\keys_latexe_options:n {#1}
}
\@onlypreamble \ProcessKeysOptions
\@onlypreamble \ProcessKeysPackageOptions
% \end{macrocode}
%\end{macro}
%\end{macro}
%
% One message to give.
% \begin{macrocode}
\msg_new:nnnn { keyvalue } { option-unknown }
{ Unknown~option~'#1'~for~package~#2. }
{
LaTeX~has~been~asked~to~set~an~option~called~'#1'~
but~the~#2~package~has~not~created~an~option~with~this~name.
}
% \end{macrocode}
%
% \begin{macrocode}
%</package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|