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|
% \iffalse meta-comment
%
%% File: l3file.dtx Copyright (C) 2009-2011 by
%% The LaTeX3 Project <latex-team@latex-project.org>
%%
%% 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 "expl3 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 LaTeX3 Project.
%%
%% -----------------------------------------------------------------------
%
%<*driver|package>
\RequirePackage{l3names}
\GetIdInfo$Id: l3file.dtx 2242 2011-04-21 08:07:24Z joseph $
{The LaTeX3 kernel: file operations}
%</driver|package>
%<*driver>
\documentclass[full]{l3doc}
\usepackage{csquotes}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \GetFileInfo{\jobname.sty}
%
% \title{^^A
% \fileinfo
% \thanks{This file describes v\fileversion, last revised \filedate.}^^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 \filedate}
%
% \maketitle
%
% \begin{documentation}
%
% In contrast to the \pkg{l3io} module, which deals with the lowest
% level of file management, the \pkg{l3file} module provides a higher
% level interface for handling file contents. This involves providing
% convenient wrappers around many of the functions in \pkg{l3io}
% to make them more generally accessible.
%
% It is important to remember that \TeX{} will attempt to locate files using
% both the operating system path and entries in the \TeX{} file database (most
% \TeX{} systems use such a database). Thus the \enquote{current path} for
% \TeX{} is somewhat broader than that for other programs.
%
% \begin{variable}{\g_file_current_name_tl}
% Contains the name of the current \LaTeX{} file. This variable
% should not be modified: it is intended for information only. It
% will be equal to \cs{c_job_name_tl} at the start of a \LaTeX{}
% run and will be modified each time a file is read using
% \cs{file_input:n}.
% \end{variable}
%
% \begin{function}[TF]{\file_if_exist:n}
% \begin{syntax}
% \cs{file_if_exist:nTF} \Arg{file name} \Arg{true code} \Arg{false code}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by
% \cs{file_path_include:n}). The branching versions then leave
% either \meta{true code} or \meta{false code} in the input stream,
% as appropriate to the truth of the test and the variant of the
% function chosen.
% \begin{texnote}
% The \meta{file name} may contain both literal items and expandable
% content, which should on full expansion be the desired file name.
% The expansion occurs when \TeX{} searches for the file.
% \end{texnote}
% \end{function}
%
% \begin{function}{\file_add_path:nN}
% \begin{syntax}
% \cs{file_add_path:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Searches for \meta{file name} in the path as detailed for
% \cs{file_if_exist:nTF}, and if found sets the \meta{tl var} the
% fully-qualified name of the file, \emph{i.e}.~the path and file name.
% If the file is not found then the \meta{tl var} will be empty.
% \begin{texnote}
% The \meta{file name} may contain both literal items and expandable
% content, which should on full expansion be the desired file name.
% The expansion occurs when \TeX{} searches for the file.
% \end{texnote}
% \end{function}
%
% \begin{function}{\file_input:n}
% \begin{syntax}
% \cs{file_input:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} in the path as detailed for
% \cs{file_if_exist:nTF}, and if found reads in the file as
% additional \LaTeX{} source. All files read are recorded
% for information and the file name stack is updated by this
% function.
% \begin{texnote}
% The \meta{file name} may contain both literal items and expandable
% content, which should on full expansion be the desired file name.
% The expansion occurs when \TeX{} searches for the file.
% \end{texnote}
% \end{function}
%
% \begin{function}{\file_path_include:n}
% \begin{syntax}
% \cs{file_path_include:n} \Arg{path}
% \end{syntax}
% Adds \meta{path} to the list of those used to search for files
% by the \cs{file_input:n} and \cs{file_if_exist:n} function. The
% assignment is local.
% \end{function}
%
% \begin{function}{\file_path_remove:n}
% \begin{syntax}
% \cs{file_path_remove:n} \Arg{path}
% \end{syntax}
% Removes \meta{path} from the list of those used to search for files
% by the \cs{file_input:n} and \cs{file_if_exist:n} function. The
% assignment is local.
% \end{function}
%
% \begin{function}{\file_list:}
% \begin{syntax}
% \cs{file_list:}
% \end{syntax}
% This function will list all files loaded using \cs{file_input:n}
% in the log file.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{Internal file functions}
%
% \begin{function}{\g_file_stack_seq}
% Stores the stack of nested files loaded using \cs{file_input:n}. This
% is needed to restore the appropriate file name to
% \cs{g_file_current_name_tl} at the end of each file.
% \end{function}
%
% \begin{function}{\g_file_record_seq}
% Stores the name of every file loaded using \cs{file_input:n}. In
% contrast to \cs{g_file_stack_seq}, no items are ever removed from this
% sequence.
% \end{function}
%
% \begin{function}{\l_file_name_tl}
% Used to return the full name of a file for internal use.
% \end{function}
%
% \begin{function}{\l_file_search_path_seq}
% The sequence of file paths to search when loading a file.
% \end{function}
%
% \begin{function}{\l_file_search_path_saved_seq}
% When loaded on top of \LaTeXe{}, there is a need to save the search
% path so that \cs{input@path} can be used as appropriate.
% \end{function}
%
% \section{File operation implementation}
%
% \TestFiles{m3file001}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \begin{macrocode}
%<*package>
\ProvidesExplPackage
{\filename}{\filedate}{\fileversion}{\filedescription}
\package_check_loaded_expl:
%</package>
% \end{macrocode}
%
% \begin{macro}{\g_file_current_name_tl}
% The name of the current file should be available at all times.
% \begin{macrocode}
\tl_new:N \g_file_current_name_tl
% \end{macrocode}
% For the format the file name needs to be picked up at the start of the
% file. In package mode the current file name is collected from \LaTeXe{}.
% \begin{macrocode}
%<*initex>
\tex_everyjob:D \exp_after:wN
{
\tex_the:D \tex_everyjob:D
\tl_gset:Nx \g_file_current_name_tl { \tex_jobname:D }
}
%</initex>
%<*package>
\tl_gset_eq:NN \g_file_current_name_tl \@currname
%</package>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[int]{\g_file_stack_seq}
% The input list of files is stored as a sequence stack.
% \begin{macrocode}
\seq_new:N \g_file_stack_seq
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[int]{\g_file_record_seq}
% The total list of files used is recorded separately from the current file
% stack, as nothing is ever popped from this list.
% \begin{macrocode}
\seq_new:N \g_file_record_seq
% \end{macrocode}
% The current file name should be included in the file list!
% \begin{macrocode}
%<*initex>
\tex_everyjob:D \exp_after:wN
{
\tex_the:D \tex_everyjob:D
\seq_gput_right:NV \g_file_record_seq \g_file_current_name_tl
}
%</initex>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[int]{\l_file_name_tl}
% Used to return the fully-qualified name of a file.
% \begin{macrocode}
\tl_new:N \l_file_name_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[int]{\l_file_search_path_seq}
% The current search path.
% \begin{macrocode}
\seq_new:N \l_file_search_path_seq
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[int]{\l_file_search_path_saved_seq}
% The current search path has to be saved for package use.
% \begin{macrocode}
%<*package>
\seq_new:N \l_file_search_path_saved_seq
%</package>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_add_path:nN}
% \begin{macro}[aux]{\g_file_test_stream}
% \begin{macro}[aux]{\file_add_path_search:nN}
% The way to test if a file exists is to try to open it: if it does not
% exist then \TeX{} will report end-of-file. For files which are in the
% current directory, this is straight-forward. For other locations, a
% search has to be made looking at each potential path in turn. The first
% location is of course treated as the correct one. If nothing is found,
% |#2| is returned empty.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \file_add_path:nN #1#2
{
\ior_open:Nn \g_file_test_stream {#1}
\ior_if_eof:NTF \g_file_test_stream
{ \file_add_path_search:nN {#1} #2 }
{
\ior_close:N \g_file_test_stream
\tl_set:Nx #2 {#1}
}
}
\cs_new_protected_nopar:Npn \file_add_path_search:nN #1#2
{
\tl_clear:N #2
%<*package>
\cs_if_exist:NT \input@path
{
\seq_set_eq:NN \l_file_search_path_saved_seq \l_file_search_path_seq
\clist_map_inline:Nn \input@path
{ \seq_put_right:Nn \l_file_search_path_seq {##1} }
}
%</package>
\seq_map_inline:Nn \l_file_search_path_seq
{
\ior_open:Nn \g_file_test_stream { ##1 #1 }
\ior_if_eof:NF \g_file_test_stream
{
\tl_set:Nx #2 { ##1 #1 }
\seq_map_break:
}
}
%<*package>
\cs_if_exist:NT \input@path
{ \seq_set_eq:NN \l_file_search_path_seq \l_file_search_path_saved_seq }
%</package>
\ior_close:N \g_file_test_stream
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[TF]{\file_if_exist:n}
% The test for the existence of a file is a wrapper around the function to
% add a path to a file. If the file was found, the path will contain something,
% whereas if the file was not located then the return value will be empty.
% \begin{macrocode}
\prg_new_protected_conditional:Nnn \file_if_exist:n { T , F , TF }
{
\file_add_path:nN {#1} \l_file_name_tl
\tl_if_empty:NTF \l_file_name_tl
{ \prg_return_false: }
{ \prg_return_true: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_input:n}
% Loading a file is done in a safe way, checking first that the file
% exists and loading only if it does.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \file_input:n #1
{
\file_add_path:nN {#1} \l_file_name_tl
\tl_if_empty:NF \l_file_name_tl
{
%<*initex>
\seq_gput_right:Nx \g_file_record_seq {#1}
%</initex>
%<*package>
\@addtofilelist {#1}
%</package>
\seq_gpush:NV \g_file_stack_seq \g_file_current_name_tl
\tl_gset:Nn \g_file_current_name_tl {#1}
\tex_expandafter:D \tex_input:D \l_file_name_tl ~
\seq_gpop:NN \g_file_stack_seq \g_file_current_name_tl
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_path_include:n}
% \begin{macro}{\file_path_remove:n}
% Wrapper functions to manage the search path.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \file_path_include:n #1
{
\seq_if_in:NnF \l_file_search_path_seq {#1}
{ \seq_put_right:Nn \l_file_search_path_seq {#1} }
}
\cs_new_protected_nopar:Npn \file_path_remove:n #1
{ \seq_remove_all:Nn \l_file_search_path_seq {#1} }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_list:}
% A function to list all files used to the log.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \file_list:
{
\seq_remove_duplicates:N \g_file_record_seq
\iow_log:n { *~File~List~* }
\seq_map_inline:Nn \g_file_record_seq { \iow_log:n {##1} }
\iow_log:n { ************* }
}
% \end{macrocode}
% \end{macro}
%
% When used as a package, there is a need to hold onto the standard
% file list as well as the new one here.
% \begin{macrocode}
%<*package>
\AtBeginDocument
{
\clist_map_inline:Nn \@filelist
{ \seq_put_right:Nn \g_file_record_seq {#1} }
}
%</package>
% \end{macrocode}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|