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|
% \iffalse meta-comment
%
%% File: l3file.dtx Copyright (C) 1990-2014 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 "l3kernel 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>
\documentclass[full]{l3doc}
%</driver>
%<*driver|package>
\GetIdInfo$Id: l3file.dtx 4890 2014-05-26 20:59:31Z joseph $
{L3 File and I/O operations}
%</driver|package>
%<*driver>
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3file} package\\ File and I/O operations^^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}
%
% This module provides functions for working with external files. Some of these
% functions apply to an entire file, and have prefix \cs{file_\ldots}, while
% others are used to work with files on a line by line basis and have prefix
% \cs{ior_\ldots} (reading) or \cs{iow_\ldots} (writing).
%
% It is important to remember that when reading external files \TeX{} will
% attempt to locate them 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.
%
% For functions which expect a \meta{file name} argument, this argument
% may contain both literal items and expandable content, which should on
% full expansion be the desired file name. Any active characters (as
% declared in \cs{l_char_active_seq}) will \emph{not} be expanded,
% allowing the direct use of these in file names. File names will be quoted
% using |"| tokens if they contain spaces: as a result, |"| tokens are
% \emph{not} permitted in file names.
%
% \section{File operation functions}
%
% \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, updated = 2012-02-10]{\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}).
% \end{function}
%
% \begin{function}[updated = 2012-02-10]{\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 contain the
% marker \cs{q_no_value}.
% \end{function}
%
% \begin{function}[updated = 2012-02-17]{\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. An error will be raised if the file is not found.
% \end{function}
%
% \begin{function}[updated = 2012-07-04]{\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 when reading
% files. The assignment is local.
% The \meta{path} is processed in the same way as a \meta{file name},
% \emph{i.e.}, with \texttt{x}-type expansion except active
% characters. Spaces are not allowed in the \meta{path}.
% \end{function}
%
% \begin{function}[updated = 2012-07-04]{\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 when reading
% files. The assignment is local.
% The \meta{path} is processed in the same way as a \meta{file name},
% \emph{i.e.}, with \texttt{x}-type expansion except active
% characters. Spaces are not allowed in the \meta{path}.
% \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}
%
% \subsection{Input--output stream management}
%
% As \TeX{} is limited to $16$ input streams and $16$ output streams, direct
% use of the streams by the programmer is not supported in \LaTeX3. Instead, an
% internal pool of streams is maintained, and these are allocated and
% deallocated as needed by other modules. As a result, the programmer should
% close streams when they are no longer needed, to release them for other
% processes.
%
% Note that I/O operations are global: streams should all be declared
% with global names and treated accordingly.
%
% \begin{function}[added = 2011-09-26, updated = 2011-12-27]
% {\ior_new:N, \ior_new:c, \iow_new:N, \iow_new:c}
% \begin{syntax}
% \cs{ior_new:N} \meta{stream}
% \cs{iow_new:N} \meta{stream}
% \end{syntax}
% Globally reserves the name of the \meta{stream}, either for reading
% or for writing as appropriate. The \meta{stream} is not opened until
% the appropriate \cs{\ldots_open:Nn} function is used. Attempting to
% use a \meta{stream} which has not been opened is an error, and the
% \meta{stream} will behave as the corresponding \cs{c_term_\ldots}.
% \end{function}
%
% \begin{function}[updated = 2012-02-10]{\ior_open:Nn, \ior_open:cn}
% \begin{syntax}
% \cs{ior_open:Nn} \meta{stream} \Arg{file name}
% \end{syntax}
% Opens \meta{file name} for reading using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{ior_close:N} instruction
% is given or the \TeX{} run ends.
% \end{function}
%
% \begin{function}[added = 2013-01-12, TF]{\ior_open:Nn, \ior_open:cn}
% \begin{syntax}
% \cs{ior_open:NnTF} \meta{stream} \Arg{file name} \Arg{true code} \Arg{false code}
% \end{syntax}
% Opens \meta{file name} for reading using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{ior_close:N} instruction
% is given or the \TeX{} run ends. The \meta{true code} is then inserted
% into the input stream. If the file is not found, no error is raised and
% the \meta{false code} is inserted into the input stream.
% \end{function}
%
% \begin{function}[updated = 2012-02-09]{\iow_open:Nn, \iow_open:cn}
% \begin{syntax}
% \cs{iow_open:Nn} \meta{stream} \Arg{file name}
% \end{syntax}
% Opens \meta{file name} for writing using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{iow_close:N} instruction
% is given or the \TeX{} run ends. Opening a file for writing will clear
% any existing content in the file (\emph{i.e.}~writing is \emph{not}
% additive).
% \end{function}
%
% \begin{function}[updated = 2012-07-31]
% {\ior_close:N, \ior_close:c, \iow_close:N, \iow_close:c}
% \begin{syntax}
% \cs{ior_close:N} \meta{stream}
% \cs{iow_close:N} \meta{stream}
% \end{syntax}
% Closes the \meta{stream}. Streams should always be closed when
% they are finished with as this ensures that they remain available
% to other programmers.
% \end{function}
%
% \begin{function}[updated = 2012-09-09]{\ior_list_streams:, \iow_list_streams:}
% \begin{syntax}
% \cs{ior_list_streams:}
% \cs{iow_list_streams:}
% \end{syntax}
% Displays a list of the file names associated with each open
% stream: intended for tracking down problems.
% \end{function}
%
% \subsection{Reading from files}
%
% \begin{function}[added = 2012-06-24]{\ior_get:NN}
% \begin{syntax}
% \cs{ior_get:NN} \meta{stream} \meta{token list variable}
% \end{syntax}
% Function that reads one or more lines (until an equal number of left
% and right braces are found) from the input \meta{stream} and stores
% the result locally in the \meta{token list} variable. If the
% \meta{stream} is not open, input is requested from the terminal.
% The material read from the \meta{stream} will be tokenized by
% \TeX{} according to the category codes in force when the function
% is used. Note that any blank lines will be converted to the token
% \cs{par}. Therefore, if skipping blank lines is requires a test such as
% \begin{verbatim}
% \ior_get:NN \l_my_stream \l_tmpa_tl
% \tl_set:Nn \l_tmpb_tl { \par }
% \tl_if_eq:NNF \l_tmpa_tl \l_tmpb_tl
% ...
% \end{verbatim}
% may be used. Also notice that if multiple lines are read to match braces
% then the resulting token list will contain \cs{par} tokens. As normal
% \TeX{} tokenization is in force, any lines which do not end in a comment
% character (usually |%|) will have the line ending converted to a space,
% so for example input
% \begin{verbatim}
% a b c
% \end{verbatim}
% will result in a token list |a b c |.
% \begin{texnote}
% This protected macro expands to the \TeX{} primitive \tn{read}
% along with the |to| keyword.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2012-06-24, updated = 2012-07-31]{\ior_get_str:NN}
% \begin{syntax}
% \cs{ior_get_str:NN} \meta{stream} \meta{token list variable}
% \end{syntax}
% Function that reads one line from the input \meta{stream} and stores
% the result locally in the \meta{token list} variable. If the
% \meta{stream} is not open, input is requested from the terminal.
% The material is read from the \meta{stream} as a series of tokens with
% category code $12$ (other), with the exception of space
% characters which are given category code $10$ (space).
% Multiple whitespace characters are retained by this process. It will
% always only read one line and any blank lines in the input
% will result in the \meta{token list variable} being empty. Unlike
% \cs{ior_get:NN}, line ends do not receive any special treatment. Thus
% input
% \begin{verbatim}
% a b c
% \end{verbatim}
% will result in a token list |a b c| with the letters |a|, |b|, and |c|
% having category code~12.
% \begin{texnote}
% This protected macro is a wrapper around the \eTeX{} primitive
% \tn{readline}. However, the end-line character normally added by
% this primitive is not included in the result of
% \cs{ior_get_str:NN}.
% \end{texnote}
% \end{function}
%
%\begin{function}[updated = 2012-02-10, EXP, pTF]{\ior_if_eof:N}
% \begin{syntax}
% \cs{ior_if_eof_p:N} \meta{stream} \\
% \cs{ior_if_eof:NTF} \meta{stream} \Arg{true code} \Arg{false code}
% \end{syntax}
% Tests if the end of a \meta{stream} has been reached during a reading
% operation. The test will also return a \texttt{true} value if
% the \meta{stream} is not open.
%\end{function}
%
% \section{Writing to files}
%
% \begin{function}[updated = 2012-06-05]{\iow_now:Nn, \iow_now:Nx}
% \begin{syntax}
% \cs{iow_now:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} immediately (\emph{i.e.}~the write operation is called
% on expansion of \cs{iow_now:Nn}).
% \end{function}
%
% \begin{function}{\iow_log:n, \iow_log:x}
% \begin{syntax}
% \cs{iow_log:n} \Arg{tokens}
% \end{syntax}
% This function writes the given \meta{tokens} to the log (transcript)
% file immediately: it is a dedicated version of \cs{iow_now:Nn}.
% \end{function}
%
% \begin{function}{\iow_term:n, \iow_term:x}
% \begin{syntax}
% \cs{iow_term:n} \Arg{tokens}
% \end{syntax}
% This function writes the given \meta{tokens} to the terminal
% file immediately: it is a dedicated version of \cs{iow_now:Nn}.
% \end{function}
%
% \begin{function}{\iow_shipout:Nn, \iow_shipout:Nx}
% \begin{syntax}
% \cs{iow_shipout:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} when the current page is finalised (\emph{i.e.}~at
% shipout). The \texttt{x}-type variants expand the \meta{tokens}
% at the point where the function is used but \emph{not} when the
% resulting tokens are written to the \meta{stream}
% (\emph{cf.}~\cs{iow_shipout_x:Nn}).
% \end{function}
%
% \begin{function}[updated = 2012-09-08]{\iow_shipout_x:Nn, \iow_shipout_x:Nx}
% \begin{syntax}
% \cs{iow_shipout_x:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} when the current page is finalised (\emph{i.e.}~at
% shipout). The \meta{tokens} are expanded at the time of writing
% in addition to any expansion when the function is used. This makes
% these functions suitable for including material finalised during
% the page building process (such as the page number integer).
% \begin{texnote}
% This is a wrapper around the \TeX{} primitive \tn{write}.
% \end{texnote}
% \end{function}
%
% \begin{function}[EXP]{\iow_char:N}
% \begin{syntax}
% \cs{iow_char:N} |\|\meta{char}
% \end{syntax}
% Inserts \meta{char} into the output stream. Useful when trying to
% write difficult characters such as |%|, |{|, |}|,
% \emph{etc.}~in messages, for example:
% \begin{verbatim}
% \iow_now:Nx \g_my_iow { \iow_char:N \{ text \iow_char:N \} }
% \end{verbatim}
% The function has no effect if writing is taking place without
% expansion (\emph{e.g.}~in the second argument of \cs{iow_now:Nn}).
% \end{function}
%
% \begin{function}[EXP]{\iow_newline:}
% \begin{syntax}
% \cs{iow_newline:}
% \end{syntax}
% Function to add a new line within the \meta{tokens} written to a
% file. The function has no effect if writing is taking place without
% expansion (\emph{e.g.}~in the second argument of \cs{iow_now:Nn}).
% \end{function}
%
% \subsection{Wrapping lines in output}
%
% \begin{function}[added = 2012-06-28]{\iow_wrap:nnnN}
% \begin{syntax}
% \cs{iow_wrap:nnnN} \Arg{text} \Arg{run-on text} \Arg{set up} \meta{function}
% \end{syntax}
% This function will wrap the \meta{text} to a fixed number of
% characters per line. At the start of each line which is wrapped,
% the \meta{run-on text} will be inserted. The line character count
% targeted will be the value of \cs{l_iow_line_count_int} minus the
% number of characters in the \meta{run-on text}. The \meta{text} and
% \meta{run-on text} are exhaustively expanded by the function, with the
% following substitutions:
% \begin{itemize}
% \item |\\| may be used to force a new line,
% \item \verb*|\ | may be used to represent a forced space
% (for example after a control sequence),
% \item |\#|, |\%|, |\{|, |\}|, |\~| may be used to represent
% the corresponding character,
% \item \cs{iow_indent:n} may be used to indent a part of the
% message.
% \end{itemize}
% Additional functions may be added to the wrapping by using the
% \meta{set up}, which is executed before the wrapping takes place: this
% may include overriding the substitutions listed.
%
% Any expandable material in the \meta{text} which is not to be expanded
% on wrapping should be converted to a string using \cs{token_to_str:N},
% \cs{tl_to_str:n}, \cs{tl_to_str:N}, \emph{etc.}
%
% The result of the wrapping operation is passed as a braced argument to the
% \meta{function}, which will typically be a wrapper around a write
% operation. The output of \cs{iow_wrap:nnnN} (\emph{i.e.}~the argument
% passed to the \meta{function}) will consist of characters of category
% \enquote{other} (category code~12), with the exception of spaces which
% will have category \enquote{space} (category code~10). This means that the
% output will \emph{not} expand further when written to a file.
%
% \begin{texnote}
% Internally, \cs{iow_wrap:nnnN} carries out an \texttt{x}-type expansion
% on the \meta{text} to expand it. This is done in such a way that
% \cs{exp_not:N} or \cs{exp_not:n} \emph{could} be used to prevent
% expansion of material. However, this is less conceptually clear than
% conversion to a string, which is therefore the supported method for
% handling expandable material in the \meta{text}.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2011-09-21]{\iow_indent:n}
% \begin{syntax}
% \cs{iow_indent:n} \Arg{text}
% \end{syntax}
% In the context of \cs{iow_wrap:nnnN} (for instance in messages),
% indents \meta{text} by four spaces. This function will not cause
% a line break, and only affects lines which start within the scope
% of the \meta{text}. In case the indented \meta{text} should appear
% on separate lines from the surrounding text, use |\\| to force
% line breaks.
% \end{function}
%
% \begin{variable}[added = 2012-06-24]{\l_iow_line_count_int}
% The maximum number of characters in a line to be written
% by the \cs{iow_wrap:nnnN}
% function. This value depends on the \TeX{} system in use: the standard
% value is $78$, which is typically correct for unmodified \TeX{}live
% and MiK\TeX{} systems.
% \end{variable}
%
% \begin{variable}[added = 2011-09-05]{\c_catcode_other_space_tl}
% Token list containing one character with category code $12$,
% (\enquote{other}), and character code $32$ (space).
% \end{variable}
%
% \subsection{Constant input--output streams}
%
% \begin{variable}{\c_term_ior}
% Constant input stream for reading from the terminal. Reading from this
% stream using \cs{ior_get:NN} or similar will result in a prompt from
% \TeX{} of the form
% \begin{verbatim}
% <tl>=
% \end{verbatim}
% \end{variable}
%
% \begin{variable}{\c_log_iow, \c_term_iow}
% Constant output streams for writing to the log and to the terminal
% (plus the log), respectively.
% \end{variable}
%
% \subsection{Primitive conditionals}
%
% \begin{function}[EXP]{\if_eof:w}
% \begin{syntax}
% \cs{if_eof:w} \meta{stream}
% ~~\meta{true code}
% \cs{else:}
% ~~\meta{false code}
% \cs{fi:}
% \end{syntax}
% Tests if the \meta{stream} returns \enquote{end of file}, which is true
% for non-existent files. The \cs{else:} branch is optional.
% \begin{texnote}
% This is the \TeX{} primitive \tn{ifeof}.
% \end{texnote}
% \end{function}
%
% \subsection{Internal file functions and variables}
%
% \begin{variable}{\g__file_internal_ior}
% Used to test for the existence of files when opening.
% \end{variable}
%
% \begin{variable}{\l__file_internal_name_tl}
% Used to return the full name of a file for internal use.
% \end{variable}
%
% \begin{function}[added = 2012-02-09]{\__file_name_sanitize:nn}
% \begin{syntax}
% \cs{__file_name_sanitize:nn} \Arg{name} \Arg{tokens}
% \end{syntax}
% Exhaustively-expands the \meta{name} with the exception of any
% category \meta{active} (catcode~$13$) tokens, which are not expanded.
% The list of \meta{active} tokens is taken from \cs{l_char_active_seq}.
% The \meta{sanitized name} is then inserted (in braces) after the
% \meta{tokens}, which should further process the file name. If any
% spaces are found in the name after expansion, an error is raised.
% \end{function}
%
% \subsection{Internal input--output functions}
%
% \begin{function}[added = 2012-01-23]{\__ior_open:Nn, \__ior_open:No}
% \begin{syntax}
% \cs{__ior_open:Nn} \meta{stream} \Arg{file name}
% \end{syntax}
% This function has identical syntax to the public version. However,
% is does not take precautions against active characters in the
% \meta{file name}, and it does not attempt to add a \meta{path} to
% the \meta{file name}: it is therefore intended to be used by
% higher-level
% functions which have already fully expanded the \meta{file name} and which
% need to perform multiple open or close operations. See for example the
% implementation of \cs{file_add_path:nN},
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3file} implementation}
%
% \TestFiles{m3file001}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=file>
% \end{macrocode}
%
% \subsection{File operations}
%
% \begin{variable}{\g_file_current_name_tl}
% The name of the current file should be available at all times.
% 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}
\tl_new:N \g_file_current_name_tl
%<*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{variable}
%
% \begin{variable}{\g_@@_stack_seq}
% The input list of files is stored as a sequence stack.
% \begin{macrocode}
\seq_new:N \g_@@_stack_seq
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_record_seq}
% The total list of files used is recorded separately from the current
% file stack, as nothing is ever popped from this list. The current
% file name should be included in the file list! In format mode, this
% is done at the very start of the \TeX{} run. In package mode we
% will eventually copy the contents of \cs{@filelist}.
% \begin{macrocode}
\seq_new:N \g_@@_record_seq
%<*initex>
\tex_everyjob:D \exp_after:wN
{
\tex_the:D \tex_everyjob:D
\seq_gput_right:NV \g_@@_record_seq \g_file_current_name_tl
}
%</initex>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_internal_tl}
% Used as a short-term scratch variable. It may be possible to reuse
% \cs{l_@@_internal_name_tl} there.
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_internal_name_tl}
% Used to return the fully-qualified name of a file.
% \begin{macrocode}
\tl_new:N \l_@@_internal_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_search_path_seq}
% The current search path.
% \begin{macrocode}
\seq_new:N \l_@@_search_path_seq
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_saved_search_path_seq}
% The current search path has to be saved for package use.
% \begin{macrocode}
%<*package>
\seq_new:N \l_@@_saved_search_path_seq
%</package>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_internal_seq}
% Scratch space for comma list conversion in package mode.
% \begin{macrocode}
%<*package>
\seq_new:N \l_@@_internal_seq
%</package>
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[int]{\@@_name_sanitize:nn}
% \begin{macro}[int, aux]{\@@_name_sanitize_aux:n}
% For converting a token list to a string where active characters are treated
% as strings from the start. The logic to the quoting normalisation is the
% same as used by \texttt{lualatexquotejobname}: check for balanced |"|, and
% assuming they balance strip all of them out before quoting the entire name
% if it contains spaces.
% \begin{macrocode}
\cs_new_protected:Npn \@@_name_sanitize:nn #1#2
{
\group_begin:
\seq_map_inline:Nn \l_char_active_seq
{ \cs_set_nopar:Npx ##1 { \token_to_str:N ##1 } }
\tl_set:Nx \l_@@_internal_name_tl {#1}
\tl_set:Nx \l_@@_internal_name_tl
{ \tl_to_str:N \l_@@_internal_name_tl }
\int_compare:nNnTF
{
\int_mod:nn
{
0 \tl_map_function:NN \l_@@_internal_name_tl
\@@_name_sanitize_aux:n
}
\c_two
}
= \c_zero
{
\tl_remove_all:Nn \l_@@_internal_name_tl { " }
\tl_if_in:NnT \l_@@_internal_name_tl { ~ }
{
\tl_set:Nx \l_@@_internal_name_tl
{ " \exp_not:V \l_@@_internal_name_tl " }
}
}
{
\__msg_kernel_error:nnx { kernel } { unbalanced-quote-in-filename }
{ \l_@@_internal_name_tl }
}
\use:x
{
\group_end:
\exp_not:n {#2} { \l_@@_internal_name_tl }
}
}
\cs_new:Npn \@@_name_sanitize_aux:n #1
{
\str_if_eq:nnT {#1} { " }
{ + \c_one }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_add_path:nN}
% \begin{macro}[aux]{\@@_add_path:nN, \@@_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:Npn \file_add_path:nN #1
{ \@@_name_sanitize:nn {#1} { \@@_add_path:nN } }
\cs_new_protected:Npn \@@_add_path:nN #1#2
{
\__ior_open:Nn \g_@@_internal_ior {#1}
\ior_if_eof:NTF \g_@@_internal_ior
{ \@@_add_path_search:nN {#1} #2 }
{ \tl_set:Nn #2 {#1} }
\ior_close:N \g_@@_internal_ior
}
\cs_new_protected:Npn \@@_add_path_search:nN #1#2
{
\tl_set:Nn #2 { \q_no_value }
%<*package>
\cs_if_exist:NT \input@path
{
\seq_set_eq:NN \l_@@_saved_search_path_seq \l_@@_search_path_seq
\seq_set_split:NnV \l_@@_internal_seq { , } \input@path
\seq_concat:NNN \l_@@_search_path_seq
\l_@@_search_path_seq \l_@@_internal_seq
}
%</package>
\seq_map_inline:Nn \l_@@_search_path_seq
{
\__ior_open:Nn \g_@@_internal_ior { ##1 #1 }
\ior_if_eof:NF \g_@@_internal_ior
{
\tl_set:Nx #2 { ##1 #1 }
\seq_map_break:
}
}
%<*package>
\cs_if_exist:NT \input@path
{ \seq_set_eq:NN \l_@@_search_path_seq \l_@@_saved_search_path_seq }
%</package>
}
% \end{macrocode}
% \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 \cs{q_no_value}.
% \begin{macrocode}
\prg_new_protected_conditional:Npnn \file_if_exist:n #1 { T , F , TF }
{
\file_add_path:nN {#1} \l_@@_internal_name_tl
\quark_if_no_value:NTF \l_@@_internal_name_tl
{ \prg_return_false: }
{ \prg_return_true: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_input:n}
% \begin{macro}[int]{\@@_if_exist:nT}
% \begin{macro}[aux]{\@@_input:n \@@_input:V}
% \begin{macro}[aux]{\@@_input_aux:n, \@@_input_aux:o}
% Loading a file is done in a safe way, checking first that the file
% exists and loading only if it does. Push the file name on the
% \cs{g_@@_stack_seq}, and add it to the file list, either
% \cs{g_@@_record_seq}, or \cs{@filelist} in package mode.
% \begin{macrocode}
\cs_new_protected:Npn \file_input:n #1
{
\@@_if_exist:nT {#1}
{ \@@_input:V \l_@@_internal_name_tl }
}
% \end{macrocode}
% This code is spun out as a separate function so it is available
% for other kernel file operations which have the same logic.
% \begin{macrocode}
\cs_new_protected:Npn \@@_if_exist:nT #1#2
{
\file_add_path:nN {#1} \l_@@_internal_name_tl
\quark_if_no_value:NTF \l_@@_internal_name_tl
{
\@@_name_sanitize:nn {#1}
{ \__msg_kernel_error:nnx { kernel } { file-not-found } }
}
{ #2 }
}
\cs_new_protected:Npn \@@_input:n #1
{
\tl_if_in:nnTF {#1} { . }
{ \@@_input_aux:n {#1} }
{ \@@_input_aux:o { \tl_to_str:n { #1 . tex } } }
}
\cs_generate_variant:Nn \@@_input:n { V }
\cs_new_protected:Npn \@@_input_aux:n #1
{
%<*initex>
\seq_gput_right:Nn \g_@@_record_seq {#1}
%</initex>
%<*package>
\clist_if_exist:NTF \@filelist
{ \@addtofilelist {#1} }
{ \seq_gput_right:Nn \g_@@_record_seq {#1} }
%</package>
\seq_gpush:No \g_@@_stack_seq \g_file_current_name_tl
\tl_gset:Nn \g_file_current_name_tl {#1}
\tex_input:D #1 \c_space_tl
\seq_gpop:NN \g_@@_stack_seq \l_@@_internal_tl
\tl_gset_eq:NN \g_file_current_name_tl \l_@@_internal_tl
}
\cs_generate_variant:Nn \@@_input_aux:n { o }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_path_include:n}
% \begin{macro}{\file_path_remove:n}
% \begin{macro}[aux]{\@@_path_include:n}
% Wrapper functions to manage the search path.
% \begin{macrocode}
\cs_new_protected:Npn \file_path_include:n #1
{ \@@_name_sanitize:nn {#1} { \@@_path_include:n } }
\cs_new_protected:Npn \@@_path_include:n #1
{
\seq_if_in:NnF \l_@@_search_path_seq {#1}
{ \seq_put_right:Nn \l_@@_search_path_seq {#1} }
}
\cs_new_protected:Npn \file_path_remove:n #1
{
\@@_name_sanitize:nn {#1}
{ \seq_remove_all:Nn \l_@@_search_path_seq }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_list:}
% A function to list all files used to the log, without duplicates.
% In package mode, if \cs{@filelist} is still defined, we need to take
% it into account (we capture it \cs{AtBeginDocument} into
% \cs{g_@@_record_seq}), turning each file name into a string.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \file_list:
{
\seq_set_eq:NN \l_@@_internal_seq \g_@@_record_seq
%<*package>
\clist_if_exist:NT \@filelist
{
\clist_map_inline:Nn \@filelist
{
\seq_put_right:No \l_@@_internal_seq
{ \tl_to_str:n {##1} }
}
}
%</package>
\seq_remove_duplicates:N \l_@@_internal_seq
\iow_log:n { *~File~List~* }
\seq_map_inline:Nn \l_@@_internal_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. File names recorded in
% \cs{@filelist} must be turned to strings before being added to
% \cs{g_@@_record_seq}.
% \begin{macrocode}
%<*package>
\AtBeginDocument
{
\clist_map_inline:Nn \@filelist
{ \seq_gput_right:No \g_@@_record_seq { \tl_to_str:n {#1} } }
}
%</package>
% \end{macrocode}
%
% \subsection{Input operations}
%
% \begin{macrocode}
%<@@=ior>
% \end{macrocode}
%
% \subsubsection{Variables and constants}
%
% \begin{variable}{\c_term_ior}
% Reading from the terminal (with a prompt) is done using a positive
% but non-existent stream number. Unlike writing, there is no concept
% of reading from the log.
% \begin{macrocode}
\cs_new_eq:NN \c_term_ior \c_sixteen
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_seq}
% A list of the currently-available input streams to be used as a
% stack. In format mode, all streams (from $0$ to~$15$) are
% available, while the package requests streams to \LaTeXe{} as they
% are needed (initially none are needed), so the starting point
% varies!
% \begin{macrocode}
\seq_new:N \g_@@_streams_seq
%<*initex>
\seq_gset_split:Nnn \g_@@_streams_seq { , }
{ 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 }
%</initex>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_stream_tl}
% Used to recover the raw stream number from the stack.
% \begin{macrocode}
\tl_new:N \l_@@_stream_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_prop}
% The name of the file attached to each stream is tracked in a property
% list.
% \begin{macrocode}
\prop_new:N \g_@@_streams_prop
%<*package>
\prop_gput:Nnn \g_@@_streams_prop { 0 } { LaTeX2e~reserved }
%</package>
% \end{macrocode}
% \end{variable}
%
% \subsubsection{Stream management}
%
% \begin{macro}{\ior_new:N, \ior_new:c}
% Reserving a new stream is done by defining the name as equal to using the
% terminal.
% \begin{macrocode}
\cs_new_protected:Npn \ior_new:N #1 { \cs_new_eq:NN #1 \c_term_ior }
\cs_generate_variant:Nn \ior_new:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_open:Nn, \ior_open:cn}
% \begin{macro}[aux]{\@@_open_aux:Nn}
% Opening an input stream requires a bit of pre-processing. The file name
% is sanitized to deal with active characters, before an auxiliary adds a
% path and checks that the file really exists. If those two tests pass, then
% pass the information on to the lower-level function which deals with
% streams.
% \begin{macrocode}
\cs_new_protected:Npn \ior_open:Nn #1#2
{ \__file_name_sanitize:nn {#2} { \@@_open_aux:Nn #1 } }
\cs_generate_variant:Nn \ior_open:Nn { c }
\cs_new_protected:Npn \@@_open_aux:Nn #1#2
{
\file_add_path:nN {#2} \l__file_internal_name_tl
\quark_if_no_value:NTF \l__file_internal_name_tl
{ \__msg_kernel_error:nnx { kernel } { file-not-found } {#2} }
{ \@@_open:No #1 \l__file_internal_name_tl }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[TF]{\ior_open:Nn, \ior_open:cn}
% \begin{macro}[aux]{\@@_open_aux:NnTF}
% Much the same idea for opening a read with a conditional, except the
% auxiliary function does not issue an error if the file is not found.
% \begin{macrocode}
\prg_new_protected_conditional:Npnn \ior_open:Nn #1#2 { T , F , TF }
{ \__file_name_sanitize:nn {#2} { \@@_open_aux:NnTF #1 } }
\cs_generate_variant:Nn \ior_open:NnT { c }
\cs_generate_variant:Nn \ior_open:NnF { c }
\cs_generate_variant:Nn \ior_open:NnTF { c }
\cs_new_protected:Npn \@@_open_aux:NnTF #1#2
{
\file_add_path:nN {#2} \l__file_internal_name_tl
\quark_if_no_value:NTF \l__file_internal_name_tl
{ \prg_return_false: }
{
\@@_open:No #1 \l__file_internal_name_tl
\prg_return_true:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[int]{\@@_open:Nn, \@@_open:No}
% \begin{macro}[aux]{\@@_open_stream:Nn}
% The stream allocation itself uses the fact that there is a list of all of
% those available, so allocation is simply a question of using the number at
% the top of the list. In package mode, life gets more complex as it's
% important to keep things in sync. That is done using a two-part approach:
% any streams that have already been taken up by \pkg{ior} but are now free
% are tracked, so we first try those. If that fails, ask \LaTeXe{} for a new
% stream and use that number (after a bit of conversion).
% \begin{macrocode}
\cs_new_protected:Npn \@@_open:Nn #1#2
{
\ior_close:N #1
\seq_gpop:NNTF \g_@@_streams_seq \l_@@_stream_tl
{ \@@_open_stream:Nn #1 {#2} }
%<*initex>
{ \__msg_kernel_fatal:nn { kernel } { input-streams-exhausted } }
%</initex>
%<*package>
{
\cs:w newread \cs_end: #1
\tl_set:Nx \l_@@_stream_tl { \int_eval:n {#1} }
\@@_open_stream:Nn #1 {#2}
}
%</package>
}
\cs_generate_variant:Nn \@@_open:Nn { No }
\cs_new_protected:Npn \@@_open_stream:Nn #1#2
{
\tex_global:D \tex_chardef:D #1 = \l_@@_stream_tl \scan_stop:
\prop_gput:NVn \g_@@_streams_prop #1 {#2}
\tex_openin:D #1 #2 \scan_stop:
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_close:N, \ior_close:c}
% Closing a stream means getting rid of it at the \TeX{} level and
% removing from the various data structures. Unless the name passed
% is an invalid stream number (outside the range $[0,15]$), it can be
% closed. On the other hand, it only gets added to the stack if it
% was not already there, to avoid duplicates building up.
% \begin{macrocode}
\cs_new_protected:Npn \ior_close:N #1
{
\int_compare:nT { \c_minus_one < #1 < \c_sixteen }
{
\tex_closein:D #1
\prop_gremove:NV \g_@@_streams_prop #1
\seq_if_in:NVF \g_@@_streams_seq #1
{ \seq_gpush:NV \g_@@_streams_seq #1 }
\cs_gset_eq:NN #1 \c_term_ior
}
}
\cs_generate_variant:Nn \ior_close:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_list_streams:}
% \begin{macro}[aux]{\@@_list_streams:Nn}
% Show the property lists, but with some \enquote{pretty printing}.
% See the \pkg{l3msg} module. If there are no open read streams,
% issue the message \texttt{show-no-stream}, and show an empty
% token list. If there are open read streams, format them with
% \cs{__msg_show_item_unbraced:nn}, and with the message
% \texttt{show-open-streams}.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \ior_list_streams:
{ \@@_list_streams:Nn \g_@@_streams_prop { input } }
\cs_new_protected:Npn \@@_list_streams:Nn #1#2
{
\__msg_term:nnn { LaTeX / kernel }
{ \prop_if_empty:NTF #1 { show-no-stream } { show-open-streams } }
{#2}
\__msg_show_variable:n
{ \prop_map_function:NN #1 \__msg_show_item_unbraced:nn }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Reading input}
%
% \begin{macro}[int]{\if_eof:w}
% The primitive conditional
% \begin{macrocode}
\cs_new_eq:NN \if_eof:w \tex_ifeof:D
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[pTF]{\ior_if_eof:N}
% To test if some particular input stream is exhausted the following
% conditional is provided.
% \begin{macrocode}
\prg_new_conditional:Nnn \ior_if_eof:N { p , T , F , TF }
{
\cs_if_exist:NTF #1
{
\if_int_compare:w #1 = \c_sixteen
\prg_return_true:
\else:
\if_eof:w #1
\prg_return_true:
\else:
\prg_return_false:
\fi:
\fi:
}
{ \prg_return_true: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_get:NN}
% And here we read from files.
% \begin{macrocode}
\cs_new_protected:Npn \ior_get:NN #1#2
{ \tex_read:D #1 to #2 }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_get_str:NN}
% Reading as strings is a more complicated wrapper, as we wish to
% remove the endline character.
% \begin{macrocode}
\cs_new_protected:Npn \ior_get_str:NN #1#2
{
\use:x
{
\int_set_eq:NN \tex_endlinechar:D \c_minus_one
\exp_not:n { \etex_readline:D #1 to #2 }
\int_set:Nn \tex_endlinechar:D { \int_use:N \tex_endlinechar:D }
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\g__file_internal_ior}
% Needed by the higher-level code, but cannot be created until here.
% \begin{macrocode}
\ior_new:N \g__file_internal_ior
% \end{macrocode}
% \end{variable}
%
% \subsection{Output operations}
%
% \begin{macrocode}
%<@@=iow>
% \end{macrocode}
%
% There is a lot of similarity here to the input operations, at least for
% many of the basics. Thus quite a bit is copied from the earlier material
% with minor alterations.
%
% \subsubsection{Variables and constants}
%
% \begin{variable}{\c_log_iow, \c_term_iow}
% Here we allocate two output streams for writing to the transcript
% file only (\cs{c_log_iow}) and to both the terminal and
% transcript file (\cs{c_term_iow}).
% \begin{macrocode}
\cs_new_eq:NN \c_log_iow \c_minus_one
\cs_new_eq:NN \c_term_iow \c_sixteen
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_seq}
% A list of the currently-available input streams to be used as a stack.
% Things are done differently in format and package mode, so the starting
% point varies!
% \begin{macrocode}
\seq_new:N \g_@@_streams_seq
%<*initex>
\seq_gset_eq:NN \g_@@_streams_seq \g__ior_streams_seq
%</initex>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_stream_tl}
% Used to recover the raw stream number from the stack.
% \begin{macrocode}
\tl_new:N \l_@@_stream_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_prop}
% As for reads, but with more reserved as \LaTeXe{} takes up a few here.
% \begin{macrocode}
\prop_new:N \g_@@_streams_prop
%<*package>
\prop_put:Nnn \g_@@_streams_prop { 0 } { LaTeX2e~reserved }
\prop_put:Nnn \g_@@_streams_prop { 1 } { LaTeX2e~reserved }
\prop_put:Nnn \g_@@_streams_prop { 2 } { LaTeX2e~reserved }
%</package>
% \end{macrocode}
% \end{variable}
%
% \subsection{Stream management}
%
% \begin{macro}{\iow_new:N, \iow_new:c}
% Reserving a new stream is done by defining the name as equal to writing
% to the terminal: odd but at least consistent.
% \begin{macrocode}
\cs_new_protected:Npn \iow_new:N #1 { \cs_new_eq:NN #1 \c_term_iow }
\cs_generate_variant:Nn \iow_new:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_open:Nn, \iow_open:cn}
% \begin{macro}[int]{\@@_open:Nn}
% \begin{macro}[aux]{\@@_open_stream:Nn}
% The same idea as for reading, but without the path and without the need
% to allow for a conditional version.
% \begin{macrocode}
\cs_new_protected:Npn \iow_open:Nn #1#2
{ \__file_name_sanitize:nn {#2} { \@@_open:Nn #1 } }
\cs_generate_variant:Nn \iow_open:Nn { c }
\cs_new_protected:Npn \@@_open:Nn #1#2
{
\iow_close:N #1
\seq_gpop:NNTF \g_@@_streams_seq \l_@@_stream_tl
{ \@@_open_stream:Nn #1 {#2} }
%<*initex>
{ \__msg_kernel_fatal:nn { kernel } { output-streams-exhausted } }
%</initex>
%<*package>
{
\cs:w newwrite \cs_end: #1
\tl_set:Nx \l_@@_stream_tl { \int_eval:n {#1} }
\@@_open_stream:Nn #1 {#2}
}
%</package>
}
\cs_generate_variant:Nn \@@_open:Nn { No }
\cs_new_protected:Npn \@@_open_stream:Nn #1#2
{
\tex_global:D \tex_chardef:D #1 = \l_@@_stream_tl \scan_stop:
\prop_gput:NVn \g_@@_streams_prop #1 {#2}
\tex_immediate:D \tex_openout:D #1 #2 \scan_stop:
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_close:N, \iow_close:c}
% Closing a stream is not quite the reverse of opening one. First,
% the close operation is easier than the open one, and second as the
% stream is actually a number we can use it directly to show that the
% slot has been freed up.
% \begin{macrocode}
\cs_new_protected:Npn \iow_close:N #1
{
\int_compare:nT { \c_minus_one < #1 < \c_sixteen }
{
\tex_immediate:D \tex_closeout:D #1
\prop_gremove:NV \g_@@_streams_prop #1
\seq_if_in:NVF \g_@@_streams_seq #1
{ \seq_gpush:NV \g_@@_streams_seq #1 }
\cs_gset_eq:NN #1 \c_term_ior
}
}
\cs_generate_variant:Nn \iow_close:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_list_streams:}
% \begin{macro}{\@@_list_streams:Nn}
% Done as for input, but with a copy of the auxiliary so the name is correct.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_list_streams:
{ \@@_list_streams:Nn \g_@@_streams_prop { output } }
\cs_new_eq:NN \@@_list_streams:Nn \__ior_list_streams:Nn
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Deferred writing}
%
% \begin{macro}{\iow_shipout_x:Nn, \iow_shipout_x:Nx}
% First the easy part, this is the primitive, which expects its
% argument to be braced.
% \begin{macrocode}
\cs_new_protected:Npn \iow_shipout_x:Nn #1#2
{ \tex_write:D #1 {#2} }
\cs_generate_variant:Nn \iow_shipout_x:Nn { Nx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_shipout:Nn, \iow_shipout:Nx}
% With \eTeX{} available deferred writing without expansion is easy.
% \begin{macrocode}
\cs_new_protected:Npn \iow_shipout:Nn #1#2
{ \tex_write:D #1 { \exp_not:n {#2} } }
\cs_generate_variant:Nn \iow_shipout:Nn { Nx }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Immediate writing}
%
% \begin{macro}{\iow_now:Nn, \iow_now:Nx}
% This routine writes the second argument onto the output stream without
% expansion. If this stream isn't open, the output goes to the terminal
% instead. If the first argument is no output stream at all, we get an
% internal error. We don't use the expansion done by \tn{write} to
% get the |Nx| variant, because it differs in subtle ways from
% \texttt{x}-expansion, namely, macro parameter characters would not
% need to be doubled.
% \begin{macrocode}
\cs_new_protected:Npn \iow_now:Nn #1#2
{ \tex_immediate:D \tex_write:D #1 { \exp_not:n {#2} } }
\cs_generate_variant:Nn \iow_now:Nn { Nx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_log:n, \iow_log:x}
% \begin{macro}{\iow_term:n, \iow_term:x}
% Writing to the log and the terminal directly are relatively easy.
% \begin{macrocode}
\cs_set_protected_nopar:Npn \iow_log:x { \iow_now:Nx \c_log_iow }
\cs_new_protected_nopar:Npn \iow_log:n { \iow_now:Nn \c_log_iow }
\cs_set_protected_nopar:Npn \iow_term:x { \iow_now:Nx \c_term_iow }
\cs_new_protected_nopar:Npn \iow_term:n { \iow_now:Nn \c_term_iow }
% \end{macrocode}
%\end{macro}
%\end{macro}
%
% \subsubsection{Special characters for writing}
%
% \begin{macro}{\iow_newline:}
% Global variable holding the character that forces a new line when
% something is written to an output stream.
% \begin{macrocode}
\cs_new_nopar:Npn \iow_newline: { ^^J }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_char:N}
% Function to write any escaped char to an output stream.
% \begin{macrocode}
\cs_new_eq:NN \iow_char:N \cs_to_str:N
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Hard-wrapping lines to a character count}
%
% The code here implements a generic hard-wrapping function. This is
% used by the messaging system, but is designed such that it is
% available for other uses.
%
% \begin{macro}[var, added = 2012-06-24]{\l_iow_line_count_int}
% This is the \enquote{raw} number of characters in a line which
% can be written to the terminal.
% The standard value is the line length typically used by
% \TeX{}Live and Mik\TeX{}.
% \begin{macrocode}
\int_new:N \l_iow_line_count_int
\int_set:Nn \l_iow_line_count_int { 78 }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_@@_target_count_int}
% This stores the target line count: the full number of characters
% in a line, minus any part for a leader at the start of each line.
% \begin{macrocode}
\int_new:N \l_@@_target_count_int
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]
% {
% \l_@@_current_line_int,
% \l_@@_current_word_int,
% \l_@@_current_indentation_int
% }
% These store the number of characters in the line and word currently
% being constructed, and the current indentation, respectively.
% \begin{macrocode}
\int_new:N \l_@@_current_line_int
\int_new:N \l_@@_current_word_int
\int_new:N \l_@@_current_indentation_int
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]
% {
% \l_@@_current_line_tl,
% \l_@@_current_word_tl,
% \l_@@_current_indentation_tl
% }
% These hold the current line of text and current word,
% and a number of spaces for indentation, respectively.
% \begin{macrocode}
\tl_new:N \l_@@_current_line_tl
\tl_new:N \l_@@_current_word_tl
\tl_new:N \l_@@_current_indentation_tl
% \end{macrocode}
%\end{macro}
%
% \begin{macro}[aux]{\l_@@_wrap_tl}
% Used for the expansion step before detokenizing, and for the output
% from wrapping text: fully expanded and with lines which are not
% overly long.
% \begin{macrocode}
\tl_new:N \l_@@_wrap_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_@@_newline_tl}
% The token list inserted to produce the new line, with the
% \meta{run-on text}.
% \begin{macrocode}
\tl_new:N \l_@@_newline_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_@@_line_start_bool}
% Boolean to avoid adding a space at the beginning of forced newlines,
% and to know when to add the indentation.
% \begin{macrocode}
\bool_new:N \l_@@_line_start_bool
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\c_catcode_other_space_tl}
% Lowercase a character with category code $12$ to produce an
% \enquote{other} space. We can do everything within the group,
% because \cs{tl_const:Nn} defines its argument globally.
% \begin{macrocode}
\group_begin:
\char_set_catcode_other:N \*
\char_set_lccode:nn {`\*} {`\ }
\tl_to_lowercase:n { \tl_const:Nn \c_catcode_other_space_tl { * } }
\group_end:
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\c_@@_wrap_marker_tl}
% \begin{macro}[aux]
% {
% \c_@@_wrap_end_marker_tl,
% \c_@@_wrap_newline_marker_tl,
% \c_@@_wrap_indent_marker_tl,
% \c_@@_wrap_unindent_marker_tl
% }
% Every special action of the wrapping code is preceded by
% the same recognizable string, \cs{c_@@_wrap_marker_tl}.
% Upon seeing that \enquote{word}, the wrapping code reads
% one space-delimited argument to know what operation to
% perform. The setting of \tn{escapechar} here is not
% very important, but makes \cs{c_@@_wrap_marker_tl} look
% nicer.
% \begin{macrocode}
\group_begin:
\int_set_eq:NN \tex_escapechar:D \c_minus_one
\tl_const:Nx \c_@@_wrap_marker_tl
{ \tl_to_str:n { \^^I \^^O \^^W \^^_ \^^W \^^R \^^A \^^P } }
\group_end:
\tl_map_inline:nn
{ { end } { newline } { indent } { unindent } }
{
\tl_const:cx { c_@@_wrap_ #1 _marker_tl }
{
\c_catcode_other_space_tl
\c_@@_wrap_marker_tl
\c_catcode_other_space_tl
#1
\c_catcode_other_space_tl
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_indent:n}
% \begin{macro}[aux]{\@@_indent:n}
% We give a dummy (protected) definition to \cs{iow_indent:n}
% when outside messages. Within wrapped message, it places
% the instruction for increasing the indentation before its
% argument, and the instruction for unindenting afterwards.
% Note that there will be no forced line-break, so the indentation
% only changes when the next line is started.
% \begin{macrocode}
\cs_new_protected:Npn \iow_indent:n #1 { }
\cs_new:Npx \@@_indent:n #1
{
\c_@@_wrap_indent_marker_tl
#1
\c_@@_wrap_unindent_marker_tl
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_wrap:nnnN}
% \begin{macro}[aux]{\@@_wrap_set:Nx}
% The main wrapping function works as follows. First give |\\|,
% \verb*|\ | and other formatting commands the correct definition for
% messages, before fully-expanding the input. In package mode, the
% expansion uses \LaTeXe{}'s \cs{protect} mechanism. Afterwards, set
% the newline marker (two assignments to fully expand, then convert
% to a string) and its length, and initialize some registers.
% There is then a loop over each word in the input, which will do the
% actual wrapping. After the loop, the resulting text is passed on to
% the function which has been given as a post-processor.
% The argument |#4| is available for additional set up steps for
% the output. The definition of |\\| and \verb*|\ | use an
% \enquote{other} space rather than a normal space, because the latter
% might be absorbed by \TeX{} to end a number or other \texttt{f}-type
% expansions. The \cs{tl_to_str:N} step converts the \enquote{other}
% space back to a normal space.
% \begin{macrocode}
\cs_new_protected:Npn \iow_wrap:nnnN #1#2#3#4
{
\group_begin:
\int_set_eq:NN \tex_escapechar:D \c_minus_one
\cs_set_nopar:Npx \{ { \token_to_str:N \{ }
\cs_set_nopar:Npx \# { \token_to_str:N \# }
\cs_set_nopar:Npx \} { \token_to_str:N \} }
\cs_set_nopar:Npx \% { \token_to_str:N \% }
\cs_set_nopar:Npx \~ { \token_to_str:N \~ }
\int_set:Nn \tex_escapechar:D { 92 }
\cs_set_eq:NN \\ \c_@@_wrap_newline_marker_tl
\cs_set_eq:NN \ \c_catcode_other_space_tl
\cs_set_eq:NN \iow_indent:n \@@_indent:n
#3
%<*initex>
\tl_set:Nx \l_@@_wrap_tl {#1}
%</initex>
%<*package>
\@@_wrap_set:Nx \l_@@_wrap_tl {#1}
%</package>
% \end{macrocode}
% This is a bit of a hack to measure the string length of the run on text
% without the \pkg{l3str} module (which is still experimental). This should
% be replaced once the string module is finalised with something a little
% cleaner.
% \begin{macrocode}
\tl_set:Nx \l_@@_newline_tl { \iow_newline: #2 }
\tl_set:Nx \l_@@_newline_tl { \tl_to_str:N \l_@@_newline_tl }
\tl_replace_all:Nnn \l_@@_newline_tl { ~ } { \c_space_tl }
\int_set:Nn \l_@@_target_count_int
{ \l_iow_line_count_int - \tl_count:N \l_@@_newline_tl + \c_one }
\int_zero:N \l_@@_current_indentation_int
\tl_clear:N \l_@@_current_indentation_tl
\int_zero:N \l_@@_current_line_int
\tl_clear:N \l_@@_current_line_tl
\bool_set_true:N \l_@@_line_start_bool
\use:x
{
\exp_not:n { \tl_clear:N \l_@@_wrap_tl }
\@@_wrap_loop:w
\tl_to_str:N \l_@@_wrap_tl
\tl_to_str:N \c_@@_wrap_end_marker_tl
\c_space_tl \c_space_tl
\exp_not:N \q_stop
}
\exp_args:NNo \group_end:
#4 \l_@@_wrap_tl
}
% \end{macrocode}
% As using the generic loader will mean that \cs{protected@edef} is
% not available, it's not placed directly in the wrap function but is set
% up as an auxiliary. In the generic loader this can then be redefined.
% \begin{macrocode}
%<*package>
\cs_new_eq:NN \@@_wrap_set:Nx \protected@edef
%</package>
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[aux]{\@@_wrap_loop:w}
% The loop grabs one word in the input, and checks whether it is
% the special marker, or a normal word.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_loop:w #1 ~ %
{
\tl_set:Nn \l_@@_current_word_tl {#1}
\tl_if_eq:NNTF \l_@@_current_word_tl \c_@@_wrap_marker_tl
{ \@@_wrap_special:w }
{ \@@_wrap_word: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\@@_wrap_word:}
% \begin{macro}[aux]{\@@_wrap_word_fits:}
% \begin{macro}[aux]{\@@_wrap_word_newline:}
% For a normal word, update the line count, then test if the current
% word would fit in the current line, and call the appropriate function.
% If the word fits in the current line, add it to the line, preceded by
% a space unless it is the first word of the line.
% Otherwise, the current line is added to the result, with the run-on text.
% The current word (and its character count) are then put in the new line.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \@@_wrap_word:
{
\int_set:Nn \l_@@_current_word_int
{ \__str_count_ignore_spaces:N \l_@@_current_word_tl }
\int_add:Nn \l_@@_current_line_int { \l_@@_current_word_int }
\int_compare:nNnTF \l_@@_current_line_int < \l_@@_target_count_int
{ \@@_wrap_word_fits: }
{ \@@_wrap_word_newline: }
\@@_wrap_loop:w
}
\cs_new_protected_nopar:Npn \@@_wrap_word_fits:
{
\bool_if:NTF \l_@@_line_start_bool
{
\bool_set_false:N \l_@@_line_start_bool
\tl_put_right:Nx \l_@@_current_line_tl
{ \l_@@_current_indentation_tl \l_@@_current_word_tl }
\int_add:Nn \l_@@_current_line_int
{ \l_@@_current_indentation_int }
}
{
\tl_put_right:Nx \l_@@_current_line_tl
{ ~ \l_@@_current_word_tl }
\int_incr:N \l_@@_current_line_int
}
}
\cs_new_protected_nopar:Npn \@@_wrap_word_newline:
{
\tl_put_right:Nx \l_@@_wrap_tl
{ \l_@@_current_line_tl \l_@@_newline_tl }
\int_set:Nn \l_@@_current_line_int
{
\l_@@_current_word_int
+ \l_@@_current_indentation_int
}
\tl_set:Nx \l_@@_current_line_tl
{ \l_@@_current_indentation_tl \l_@@_current_word_tl }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[aux]{\@@_wrap_special:w}
% \begin{macro}[aux]{\@@_wrap_newline:w}
% \begin{macro}[aux]{\@@_wrap_indent:w}
% \begin{macro}[aux]{\@@_wrap_unindent:w}
% \begin{macro}[aux]{\@@_wrap_end:w}
% When the \enquote{special} marker is encountered,
% read what operation to perform, as a space-delimited
% argument, perform it, and remember to loop.
% In fact, to avoid spurious spaces when two special
% actions follow each other, we look ahead for another
% copy of the marker.
% Forced newlines are almost identical to those caused by overflow,
% except that here the word is empty.
% To indent more, add four spaces to the start of the indentation
% token list. To reduce indentation, rebuild the indentation token
% list using \cs{prg_replicate:nn}.
% At the end, we simply save the last line (without the run-on text),
% and prevent the loop.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_special:w #1 ~ #2 ~ #3 ~ %
{
\use:c { @@_wrap_#1: }
\str_if_eq_x:nnTF { #2~#3 } { ~ \c_@@_wrap_marker_tl }
{ \@@_wrap_special:w }
{ \@@_wrap_loop:w #2 ~ #3 ~ }
}
\cs_new_protected_nopar:Npn \@@_wrap_newline:
{
\tl_put_right:Nx \l_@@_wrap_tl
{ \l_@@_current_line_tl \l_@@_newline_tl }
\int_zero:N \l_@@_current_line_int
\tl_clear:N \l_@@_current_line_tl
\bool_set_true:N \l_@@_line_start_bool
}
\cs_new_protected_nopar:Npx \@@_wrap_indent:
{
\int_add:Nn \l_@@_current_indentation_int \c_four
\tl_put_right:Nx \exp_not:N \l_@@_current_indentation_tl
{ \c_space_tl \c_space_tl \c_space_tl \c_space_tl }
}
\cs_new_protected_nopar:Npn \@@_wrap_unindent:
{
\int_sub:Nn \l_@@_current_indentation_int \c_four
\tl_set:Nx \l_@@_current_indentation_tl
{ \prg_replicate:nn \l_@@_current_indentation_int { ~ } }
}
\cs_new_protected_nopar:Npn \@@_wrap_end:
{
\tl_put_right:Nx \l_@@_wrap_tl
{ \l_@@_current_line_tl }
\use_none_delimit_by_q_stop:w
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[aux]{\__str_count_ignore_spaces:N}
% \begin{macro}[aux]{\__str_count_ignore_spaces:n}
% \begin{macro}[aux]{\__str_count_loop:NNNNNNNNN}
% The wrapping code requires to measure the number of character
% in each word. This could be done with \cs{tl_count:n}, but
% it is ten times faster (literally) to use the code below.
% \begin{macrocode}
\cs_new_nopar:Npn \__str_count_ignore_spaces:N
{ \exp_args:No \__str_count_ignore_spaces:n }
\cs_new:Npn \__str_count_ignore_spaces:n #1
{
\__int_value:w \__int_eval:w
\exp_after:wN \__str_count_loop:NNNNNNNNN \tl_to_str:n {#1}
{ X8 } { X7 } { X6 } { X5 } { X4 } { X3 } { X2 } { X1 } { X0 } \q_stop
\__int_eval_end:
}
\cs_new:Npn \__str_count_loop:NNNNNNNNN #1#2#3#4#5#6#7#8#9
{
\if_catcode:w X #9
\exp_after:wN \use_none_delimit_by_q_stop:w
\else:
9 +
\exp_after:wN \__str_count_loop:NNNNNNNNN
\fi:
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Messages}
%
% \begin{macrocode}
\__msg_kernel_new:nnnn { kernel } { file-not-found }
{ File~'#1'~not~found. }
{
The~requested~file~could~not~be~found~in~the~current~directory,~
in~the~TeX~search~path~or~in~the~LaTeX~search~path.
}
\__msg_kernel_new:nnnn { kernel } { input-streams-exhausted }
{ Input~streams~exhausted }
{
TeX~can~only~open~up~to~16~input~streams~at~one~time.\\
All~16~are~currently~in~use,~and~something~wanted~to~open~
another~one.
}
\__msg_kernel_new:nnnn { kernel } { output-streams-exhausted }
{ Output~streams~exhausted }
{
TeX~can~only~open~up~to~16~output~streams~at~one~time.\\
All~16~are~currently~in~use,~and~something~wanted~to~open~
another~one.
}
\__msg_kernel_new:nnnn { kernel } { unbalanced-quote-in-filename }
{ Unbalanced~quotes~in~file~name~'#1'. }
{
File~names~must~contain~balanced~numbers~of~quotes~(").
}
% \end{macrocode}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|