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|
% \iffalse meta-comment
%
%% File: l3file.dtx
%
% Copyright (C) 1990-2023 The LaTeX 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
%
% https://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 development version of the bundle can be found at
%
% https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\PrintIndex
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3file} package\\ File and I/O operations^^A
% }
%
% \author{^^A
% The \LaTeX{} Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2023-10-23}
%
% \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[no-index]{file_\ldots}, while
% others are used to work with files on a line by line basis and have prefix
% \cs[no-index]{ior_\ldots} (reading) or \cs[no-index]{iow_\ldots} (writing).
%
% It is important to remember that when reading external files \TeX{}
% attempts to locate them 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.
%
% 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. Active characters (as
% declared in \cs{l_char_active_seq}) are \emph{not} expanded,
% allowing the direct use of these in file names. Quote tokens (|"|) are
% not permitted in file names as they are reserved for internal use by some
% \TeX{} primitives.
%
% Spaces are trimmed at the beginning and end of the file name:
% this reflects the fact that some file systems do not allow or interact
% unpredictably with spaces in these positions. When no extension is given,
% this will trim spaces from the start of the name only.
%
% \section{Input--output stream management}
%
% As \TeX{} engines have a limited number of input and 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[no-index]{\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[no-index]{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.
% If the file is not found, an error is raised.
% \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:NV, \iow_open:cn, \iow_open:cV}
% \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 clears
% any existing content in the file (\emph{i.e.}~writing is \emph{not}
% additive).
% \end{function}
%
% \begin{function}[added = 2019-05-08]{\ior_shell_open:Nn}
% \begin{syntax}
% \cs{ior_shell_open:Nn} \meta{stream} \Arg{shell~command}
% \end{syntax}
% Opens the \emph{pseudo}-file created by the output of the
% \meta{shell command} for reading using \meta{stream} as the
% control sequence for 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{shell command} until a \cs{ior_close:N} instruction
% is given or the \TeX{} run ends.
% If piped system calls are disabled an error is raised.
%
% For details of handling of the \meta{shell command}, see
% \cs{sys_get_shell:nnNTF}.
% \end{function}
%
% \begin{function}[added = 2023-05-25]{\iow_shell_open:Nn}
% \begin{syntax}
% \cs{iow_shell_open:Nn} \meta{stream} \Arg{shell~command}
% \end{syntax}
% Opens the \emph{pseudo}-file created by the output of the
% \meta{shell command} for writing using \meta{stream} as the
% control sequence for 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{shell command} until a \cs{iow_close:N} instruction
% is given or the \TeX{} run ends.
% If piped system calls are disabled an error is raised.
%
% For details of handling of the \meta{shell command}, see
% \cs{sys_get_shell:nnNTF}.
% \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}[added = 2021-05-11]
% {
% \ior_show:N, \ior_show:c, \ior_log:N, \ior_log:c,
% \iow_show:N, \iow_show:c, \iow_log:N, \iow_log:c
% }
% \begin{syntax}
% \cs{ior_show:N} \meta{stream}
% \cs{ior_log:N} \meta{stream}
% \cs{iow_show:N} \meta{stream}
% \cs{iow_log:N} \meta{stream}
% \end{syntax}
% Display (to the terminal or log file) the file name associated to
% the (read or write) \meta{stream}.
% \end{function}
%
% \begin{function}[added = 2017-06-27]
% {
% \ior_show_list:, \ior_log_list:,
% \iow_show_list:, \iow_log_list:
% }
% \begin{syntax}
% \cs{ior_show_list:}
% \cs{ior_log_list:}
% \cs{iow_show_list:}
% \cs{iow_log_list:}
% \end{syntax}
% Display (to the terminal or log file) a list of the file names
% associated with each open (read or write) stream. This is intended
% for tracking down problems.
% \end{function}
%
% \subsection{Reading from files}
%
% Reading from files and reading from the terminal are separate processes in
% \pkg{expl3}. The functions \cs{ior_get:NN} and \cs{ior_str_get:NN}, and their
% branching equivalents, are designed to work with \emph{files}.
%
% \begin{function}[noTF, added = 2012-06-24, updated = 2019-03-23]{\ior_get:NN}
% \begin{syntax}
% \cs{ior_get:NN} \meta{stream} \meta{token list variable}
% \cs{ior_get:NNTF} \meta{stream} \meta{token list variable} \meta{true code} \meta{false code}
% \end{syntax}
% Function that reads one or more lines (until an equal number of left
% and right braces are found) from the file input \meta{stream} and stores
% the result locally in the \meta{token list} variable.
% The material read from the \meta{stream} is tokenized by \TeX{}
% according to the category codes and \tn{endlinechar} in force when
% the function is used. Assuming normal settings, any lines which do
% not end in a comment character~|%| have the line ending
% converted to a space, so for example input
% \begin{verbatim}
% a b c
% \end{verbatim}
% results in a token list \verb*|a b c |. Any blank line is
% converted to the token \cs{par}. Therefore, blank lines can be
% skipped by using 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}
% Also notice that if multiple lines are read to match braces
% then the resulting token list can contain \cs{par} tokens.
% In the non-branching version, where the \meta{stream} is not open
% the \meta{tl var} is set to \cs{q_no_value}.
% \begin{texnote}
% This protected macro is a wrapper around the \TeX{} primitive
% \tn{read}. Regardless of settings, \TeX{} replaces trailing space
% and tab characters (character codes 32 and~9) in each line by an
% end-of-line character (character code \tn{endlinechar}, omitted if
% \tn{endlinechar} is negative or too large) before turning
% characters into tokens according to current category codes. With
% default settings, spaces appearing at the beginning of lines are
% also ignored.
% \end{texnote}
% \end{function}
%
% \begin{function}[noTF, added = 2016-12-04, updated = 2019-03-23]
% {\ior_str_get:NN}
% \begin{syntax}
% \cs{ior_str_get:NN} \meta{stream} \meta{token list variable}
% \cs{ior_str_get:NNTF} \meta{stream} \meta{token list variable} \meta{true code} \meta{false code}
% \end{syntax}
% Function that reads one line from the file input \meta{stream} and stores
% the result locally in the \meta{token list} variable.
% 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
% always only reads one line and any blank lines in the input
% 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}
% results in a token list |a b c| with the letters |a|, |b|, and |c|
% having category code~12.
% In the non-branching version, where the\meta{stream} is not open
% the \meta{tl var} is set to \cs{q_no_value}.
% \begin{texnote}
% This protected macro is a wrapper around the \eTeX{} primitive
% \tn{readline}. Regardless of settings, \TeX{} removes trailing
% space and tab characters (character codes 32 and~9). However, the
% end-line character normally added by this primitive is not
% included in the result of \cs{ior_str_get:NN}.
% \end{texnote}
% \end{function}
%
% All mappings are done at the current group level, \emph{i.e.}~any
% local assignments made by the \meta{function} or \meta{code} discussed
% below remain in effect after the loop.
%
% \begin{function}[added = 2012-02-11]{\ior_map_inline:Nn}
% \begin{syntax}
% \cs{ior_map_inline:Nn} \meta{stream} \Arg{inline function}
% \end{syntax}
% Applies the \meta{inline function} to each set of \meta{lines}
% obtained by calling \cs{ior_get:NN} until reaching the end of the
% file. \TeX{} ignores any trailing new-line marker from the file it
% reads. The \meta{inline function} should consist of code which
% receives the \meta{line} as |#1|.
% \end{function}
%
% \begin{function}[added = 2012-02-11]{\ior_str_map_inline:Nn}
% \begin{syntax}
% \cs{ior_str_map_inline:Nn} \meta{stream} \Arg{inline function}
% \end{syntax}
% Applies the \meta{inline function} to every \meta{line}
% in the \meta{stream}. 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). The \meta{inline function} should consist of code which
% receives the \meta{line} as |#1|.
% Note that \TeX{} removes trailing space and tab characters
% (character codes 32 and 9) from every line upon input. \TeX{} also
% ignores any trailing new-line marker from the file it reads.
% \end{function}
%
% \begin{function}[added = 2019-01-13]{\ior_map_variable:NNn}
% \begin{syntax}
% \cs{ior_map_variable:NNn} \meta{stream} \meta{tl~var} \Arg{code}
% \end{syntax}
% For each set of \meta{lines} obtained by calling \cs{ior_get:NN}
% until reaching the end of the file, stores the \meta{lines} in the
% \meta{tl~var} then applies the \meta{code}. The \meta{code} will
% usually make use of the \meta{variable}, but this is not enforced.
% The assignments to the \meta{variable} are local.
% Its value after the loop is the last set of \meta{lines}, or its
% original value if the \meta{stream} is empty. \TeX{} ignores
% any trailing new-line marker from the file it reads.
% This function is typically faster than \cs{ior_map_inline:Nn}.
% \end{function}
%
% \begin{function}[added = 2019-01-13]{\ior_str_map_variable:NNn}
% \begin{syntax}
% \cs{ior_str_map_variable:NNn} \meta{stream} \meta{variable} \Arg{code}
% \end{syntax}
% For each \meta{line} in the \meta{stream}, stores the \meta{line} in
% the \meta{variable} then applies the \meta{code}. 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). The \meta{code} will usually make use
% of the \meta{variable}, but this is not enforced. The assignments
% to the \meta{variable} are local. Its value after the loop is the
% last \meta{line}, or its original value if the \meta{stream} is
% empty. Note that \TeX{} removes trailing
% space and tab characters (character codes 32 and 9) from every line
% upon input. \TeX{} also ignores any trailing new-line marker from
% the file it reads.
% This function is typically faster than \cs{ior_str_map_inline:Nn}.
% \end{function}
%
% \begin{function}[added = 2012-06-29]{\ior_map_break:}
% \begin{syntax}
% \cs{ior_map_break:}
% \end{syntax}
% Used to terminate a \cs[no-index]{ior_map_\ldots} function before all
% lines from the \meta{stream} have been processed. This
% normally takes place within a conditional statement, for example
% \begin{verbatim}
% \ior_map_inline:Nn \l_my_ior
% {
% \str_if_eq:nnTF { #1 } { bingo }
% { \ior_map_break: }
% {
% % Do something useful
% }
% }
% \end{verbatim}
% Use outside of a \cs[no-index]{ior_map_\ldots} scenario leads to low
% level \TeX{} errors.
% \begin{texnote}
% When the mapping is broken, additional tokens may be inserted
% before further items are taken
% from the input stream. This depends on the design of the mapping
% function.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2012-06-29]{\ior_map_break:n}
% \begin{syntax}
% \cs{ior_map_break:n} \Arg{code}
% \end{syntax}
% Used to terminate a \cs[no-index]{ior_map_\ldots} function before all
% lines in the \meta{stream} have been processed, inserting
% the \meta{code} after the mapping has ended. This
% normally takes place within a conditional statement, for example
% \begin{verbatim}
% \ior_map_inline:Nn \l_my_ior
% {
% \str_if_eq:nnTF { #1 } { bingo }
% { \ior_map_break:n { <code> } }
% {
% % Do something useful
% }
% }
% \end{verbatim}
% Use outside of a \cs[no-index]{ior_map_\ldots} scenario leads to low
% level \TeX{} errors.
% \begin{texnote}
% When the mapping is broken, additional tokens may be inserted
% before the \meta{code} is
% inserted into the input stream.
% This depends on the design of the mapping function.
% \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 file \meta{stream} has been reached during a reading
% operation. The test also returns a \texttt{true} value if
% the \meta{stream} is not open.
% \end{function}
%
% \subsection{Reading from the terminal}
%
% \begin{function}[added = 2019-03-23]{\ior_get_term:nN, \ior_str_get_term:nN}
% \begin{syntax}
% \cs{ior_get_term:nN} \meta{prompt} \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 terminal and stores
% the result locally in the \meta{token list} variable. Tokenization
% occurs as described for \cs{ior_get:NN} or \cs{ior_str_get:NN}, respectively.
% When the \meta{prompt}
% is empty, \TeX{} will wait for input without any other indication:
% typically the programmer will have provided a suitable text using
% e.g.~\cs{iow_term:n}. Where the \meta{prompt} is given, it will appear
% in the terminal followed by an |=|, e.g.
% \begin{verbatim}
% prompt=
% \end{verbatim}
% \end{function}
%
% \subsection{Writing to files}
%
% \begin{function}[updated = 2012-06-05]
% {
% \iow_now:Nn, \iow_now:NV, \iow_now:Ne,
% \iow_now:cn, \iow_now:cV, \iow_now:ce
% }
% \begin{syntax}
% \cs{iow_now:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This function 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:e}
% \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:e}
% \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:Ne,
% \iow_shipout:cn, \iow_shipout:ce
% }
% \begin{syntax}
% \cs{iow_shipout:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This function 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_e:Nn}).
% \begin{texnote}
% When using \pkg{expl3} with a format other than \LaTeX{}, new line
% characters inserted using \cs{iow_newline:} or using the
% line-wrapping code \cs{iow_wrap:nnnN} are not recognized in
% the argument of \cs{iow_shipout:Nn}. This may lead to the
% insertion of additional unwanted line-breaks.
% \end{texnote}
% \end{function}
%
% \begin{function}[updated = 2023-09-17]
% {
% \iow_shipout_e:Nn, \iow_shipout_e:Ne,
% \iow_shipout_e:cn, \iow_shipout_e:ce
% }
% \begin{syntax}
% \cs{iow_shipout_e:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This function 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}.
% When using \pkg{expl3} with a format other than \LaTeX{}, new line
% characters inserted using \cs{iow_newline:} or using the
% line-wrapping code \cs{iow_wrap:nnnN} are not recognized in
% the argument of \cs{iow_shipout:Nn}. This may lead to the
% insertion of additional unwanted line-breaks.
% \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:Ne \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}).
% \begin{texnote}
% When using \pkg{expl3} with a format other than \LaTeX{}, the
% character inserted by \cs{iow_newline:} is not recognized by
% \TeX{}, which may lead to the insertion of additional unwanted
% line-breaks. This issue only affects \cs{iow_shipout:Nn},
% \cs{iow_shipout_e:Nn} and direct uses of primitive operations.
% \end{texnote}
% \end{function}
%
% \subsection{Wrapping lines in output}
%
% \begin{function}[added = 2012-06-28, updated = 2017-12-04]
% {\iow_wrap:nnnN, \iow_wrap:nenN}
% \begin{syntax}
% \cs{iow_wrap:nnnN} \Arg{text} \Arg{run-on text} \Arg{set up} \meta{function}
% \end{syntax}
% This function wraps 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} is inserted. The line character count
% targeted is the value of \cs{l_iow_line_count_int} minus the
% number of characters in the \meta{run-on text} for all lines except
% the first, for which the target number of characters is simply
% \cs{l_iow_line_count_int} since there is no run-on text. The
% \meta{text} and \meta{run-on text} are exhaustively expanded by the
% function, with the following substitutions:
% \begin{itemize}
% \item |\\| or \cs{iow_newline:} 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_wrap_allow_break:} may be used to allow a line-break
% without inserting a space,
% \item \cs{iow_indent:n} may be used to indent a part of the
% \meta{text} (not the \meta{run-on text}).
% \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 is typically a wrapper around a write
% operation. The output of \cs{iow_wrap:nnnN} (\emph{i.e.}~the argument
% passed to the \meta{function}) consists of characters of category
% \enquote{other} (category code~12), with the exception of spaces which
% have category \enquote{space} (category code~10). This means that the
% output does \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 = 2023-04-25]{\iow_wrap_allow_break:}
% \begin{syntax}
% \cs{iow_wrap_allow_break:}
% \end{syntax}
% In the first argument of \cs{iow_wrap:nnnN} (for instance in
% messages), inserts a break-point that allows a line break. If
% no break occurs, this function adds nothing to the output.
% \end{function}
%
% \begin{function}[added = 2011-09-21]{\iow_indent:n}
% \begin{syntax}
% \cs{iow_indent:n} \Arg{text}
% \end{syntax}
% In the first argument of \cs{iow_wrap:nnnN} (for instance in messages),
% indents \meta{text} by four spaces. This function does 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 \hologo{MiKTeX} systems.
% \end{variable}
%
% \subsection{Constant input--output streams, and variables}
%
% \begin{variable}[added = 2017-12-11]{\g_tmpa_ior, \g_tmpb_ior}
% Scratch input stream for global use. These are never used by
% the kernel code, and so are safe for use with any \LaTeX3-defined
% function. However, they may be overwritten by other non-kernel
% code and so should only be used for short-term storage.
% \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}
%
% \begin{variable}[added = 2017-12-11]{\g_tmpa_iow, \g_tmpb_iow}
% Scratch output stream for global use. These are never used by
% the kernel code, and so are safe for use with any \LaTeX3-defined
% function. However, they may be overwritten by other non-kernel
% code and so should only be used for short-term storage.
% \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}
%
% \section{File operation functions}
%
% \begin{variable}[added = 2017-06-21]
% {
% \g_file_curr_dir_str,
% \g_file_curr_name_str,
% \g_file_curr_ext_str
% }
% Contain the directory, name and extension of the current file. The
% directory is empty if the file was loaded without an explicit
% path (\emph{i.e.}~if it is in the \TeX{} search path), and does
% \emph{not} end in |/| other than the case that it is exactly equal
% to the root directory. The \meta{name} and \meta{ext} parts together
% make up the file name, thus the \meta{name} part may be thought of
% as the \enquote{job name} for the current file. Note that \TeX{} does
% not provide information on the \meta{ext} part for the main (top
% level) file and that this file always has an empty \meta{dir} component.
% Also, the \meta{name} here will be equal to \cs{c_sys_jobname_str},
% which may be different from the real file name (if set using
% |--jobname|, for example).
% \end{variable}
%
% \begin{variable}[added = 2017-06-18, updated = 2023-06-15]
% {\l_file_search_path_seq}
% Each entry is the path to a directory which should be searched when
% seeking a file. Each path can be relative or absolute, and need
% not include the trailing slash. Spaces need not be quoted.
%
% \begin{texnote}
% When working as a package in \LaTeXe{}, \pkg{expl3} will
% automatically append the current \tn{input@path} to the
% set of values from \cs{l_file_search_path_seq}.
% \end{texnote}
% \end{variable}
%
% \begin{function}[EXP, pTF, updated = 2023-09-18]
% {\file_if_exist:n, \file_if_exist:V}
% \begin{syntax}
% \cs{file_if_exist_p:n} \Arg{file name}
% \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{l_file_search_path_seq}.
% \end{function}
%
% \begin{function}[noTF, added = 2019-01-16, updated = 2019-02-16]
% {\file_get:nnN, \file_get:VnN}
% \begin{syntax}
% \cs{file_get:nnN} \Arg{filename} \Arg{setup} \meta{tl}
% \cs{file_get:nnNTF} \Arg{filename} \Arg{setup} \meta{tl} \Arg{true code} \Arg{false code}
% \end{syntax}
% Defines \meta{tl} to the contents of \meta{filename}.
% Category codes may need to be set appropriately via the \meta{setup}
% argument.
% The non-branching version sets the \meta{tl} to \cs{q_no_value} if the file is
% not found. The branching version runs the \meta{true code} after the
% assignment to \meta{tl} if the file is found, and \meta{false code}
% otherwise.
% \end{function}
%
% \begin{function}[noTF, updated = 2019-02-16]
% {\file_get_full_name:nN, \file_get_full_name:VN}
% \begin{syntax}
% \cs{file_get_full_name:nN} \Arg{file name} \meta{tl}
% \cs{file_get_full_name:nNTF} \Arg{file name} \meta{tl} \Arg{true code} \Arg{false code}
% \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.
% This includes an extension |.tex| when the given \meta{file name}
% has no extension but the file found has that extension.
% In the non-branching version, the \meta{tl var} will be set to
% \cs{q_no_value} in the case that the file does not exist.
% \end{function}
%
% \begin{function}[added = 2019-09-03, rEXP]{\file_full_name:n, \file_full_name:V}
% \begin{syntax}
% \cs{file_full_name: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 leaves the
% fully-qualified name of the file, \emph{i.e.}~the path and file name,
% in the input stream.
% This includes an extension |.tex| when the given \meta{file name}
% has no extension but the file found has that extension.
% If the file is not found on the path, the expansion is empty.
% \end{function}
%
% \begin{function}[added = 2017-06-23, updated = 2020-06-24]
% {\file_parse_full_name:nNNN, \file_parse_full_name:VNNN}
% \begin{syntax}
% \cs{file_parse_full_name:nNNN} \Arg{full name} \meta{dir} \meta{name} \meta{ext}
% \end{syntax}
% Parses the \meta{full name} and splits it into three parts, each of
% which is returned by setting the appropriate local string variable:
% \begin{itemize}
% \item The \meta{dir}: everything up to the last |/| (path separator)
% in the \meta{file path}. As with system \texttt{PATH} variables
% and related functions, the \meta{dir} does \emph{not} include the
% trailing |/| unless it points to the root directory. If there is no path (only
% a file name), \meta{dir} is empty.
% \item The \meta{name}: everything after the last |/| up to the last |.|,
% where both of those characters are optional. The \meta{name} may
% contain multiple |.| characters. It is empty if \meta{full name}
% consists only of a directory name.
% \item The \meta{ext}: everything after the last |.| (including the dot).
% The \meta{ext} is empty if there is no |.| after the last |/|.
% \end{itemize}
%
% Before parsing, the \meta{full name} is expanded until only non-expandable
% tokens remain, except that active characters are also not expanded.
% Quotes (|"|) are invalid in file names and are discarded from the input.
% \end{function}
%
% \begin{function}[EXP, added = 2020-06-24]
% {\file_parse_full_name:n, \file_parse_full_name:V}
% \begin{syntax}
% \cs{file_parse_full_name:n} \Arg{full name}
% \end{syntax}
% Parses the \meta{full name} as described for \cs{file_parse_full_name:nNNN},
% and leaves \meta{dir}, \meta{name}, and \meta{ext} in the input stream,
% each inside a pair of braces.
% \end{function}
%
% \begin{function}[EXP, added = 2020-06-24]
% {\file_parse_full_name_apply:nN, \file_parse_full_name_apply:VN}
% \begin{syntax}
% \cs{file_parse_full_name_apply:nN} \Arg{full name} \meta{function}
% \end{syntax}
% Parses the \meta{full name} as described for \cs{file_parse_full_name:nNNN},
% and passes \meta{dir}, \meta{name}, and \meta{ext} as arguments to \meta{function},
% as an \texttt{n}-type argument each, in this order.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-11-19]
% {
% \file_hex_dump:n, \file_hex_dump:V,
% \file_hex_dump:nnn, \file_hex_dump:Vnn
% }
% \begin{syntax}
% \cs{file_hex_dump:n} \Arg{file name}
% \cs{file_hex_dump:nnn} \Arg{file name} \Arg{start index} \Arg{end index}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the hexadecimal dump of the file content in the
% input stream. The file is read as bytes, which means that in
% contrast to most \TeX{} behaviour there will be a difference in result
% depending on the line endings used in text files. The same file will
% produce the same result between different engines: the algorithm used
% is the same in all cases. When the file is not found, the result of
% expansion is empty. The \Arg{start index} and \Arg{end index} values
% work as described for \cs{str_range:nnn}.
% \end{function}
%
% \begin{function}[noTF, added = 2019-11-19]
% {
% \file_get_hex_dump:nN, \file_get_hex_dump:VN,
% \file_get_hex_dump:nnnN, \file_get_hex_dump:VnnN
% }
% \begin{syntax}
% \cs{file_get_hex_dump:nN} \Arg{file name} \meta{tl var}
% \cs{file_get_hex_dump:nnnN} \Arg{file name} \Arg{start index} \Arg{end index} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_hex_dump:n}/\cs{file_hex_dump:nnn} to the \meta{file}.
% If the file is not found, the \meta{tl var} will be set to \cs{q_no_value}.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-09-03]
% {\file_mdfive_hash:n, \file_mdfive_hash:V}
% \begin{syntax}
% \cs{file_mdfive_hash:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the MD5 sum generated from the contents of
% the file in the input stream. The file is read as bytes, which means that in
% contrast to most \TeX{} behaviour there will be a difference in result
% depending on the line endings used in text files. The same file will
% produce the same result between different engines: the algorithm used
% is the same in all cases. When the file is not found, the result of
% expansion is empty.
% \end{function}
%
% \begin{function}[noTF, added = 2017-07-11, updated = 2019-02-16]
% {\file_get_mdfive_hash:nN, \file_get_mdfive_hash:VN}
% \begin{syntax}
% \cs{file_get_mdfive_hash:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_mdfive_hash:n} to the \meta{file}. If the file is not found,
% the \meta{tl var} will be set to \cs{q_no_value}.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-09-03]{\file_size:n, \file_size:V}
% \begin{syntax}
% \cs{file_size:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the size of the file in bytes in the input stream.
% When the file is not found, the result of expansion is empty.
% \end{function}
%
% \begin{function}[noTF, added = 2017-07-09, updated = 2019-02-16]
% {\file_get_size:nN, \file_get_size:VN}
% \begin{syntax}
% \cs{file_get_size:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_size:n} to the \meta{file}. If the file is not found,
% the \meta{tl var} will be set to \cs{q_no_value}.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
% \begin{function}[rEXP, added = 2019-09-03]
% {\file_timestamp:n, \file_timestamp:V}
% \begin{syntax}
% \cs{file_timestamp:n} \Arg{file name}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths controlled by \cs{l_file_search_path_seq}.
% It then expands to leave the modification timestamp of
% the file in the input stream. The timestamp is of the form
% |D:|\meta{year}\meta{month}\meta{day}\meta{hour}^^A
% \meta{minute}\meta{second}\meta{offset}, where the latter may be |Z|
% (UTC) or \meta{plus-minus}\meta{hours}|'|\meta{minutes}|'|.
% When the file is not found, the result of expansion is empty.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
% \begin{function}[noTF, added = 2017-07-09, updated = 2019-02-16]
% {\file_get_timestamp:nN, \file_get_timestamp:VN}
% \begin{syntax}
% \cs{file_get_timestamp:nN} \Arg{file name} \meta{tl var}
% \end{syntax}
% Sets the \meta{tl var} to the result of applying
% \cs{file_timestamp:n} to the \meta{file}. If the file is not found,
% the \meta{tl var} will be set to \cs{q_no_value}.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
% \begin{function}[added = 2019-05-13, updated = 2019-09-20, pTF, EXP]
% {
% \file_compare_timestamp:nNn,
% \file_compare_timestamp:nNV,
% \file_compare_timestamp:VNn,
% \file_compare_timestamp:VNV
% }
% \begin{syntax}
% \cs{file_compare_timestamp_p:nNn} \Arg{file-1} \meta{comparator} \Arg{file-2}
% \cs{file_compare_timestamp:nNnTF} \Arg{file-1} \meta{comparator} \Arg{file-2} \Arg{true code} \Arg{false code}
% \end{syntax}
% Compares the file stamps on the two \meta{files} as indicated by
% the \meta{comparator}, and inserts either the \meta{true code}
% or \meta{false case} as required. A file which is not found
% is treated as older than any file which is found. This allows for
% example the construct
% \begin{verbatim}
% \file_compare_timestamp:nNnT { source-file } > { derived-file }
% {
% % Code to regenerate derived file
% }
% \end{verbatim}
% to work when the derived file is entirely absent. The timestamp
% of two absent files is regarded as different.
% This is not available in older versions of \XeTeX{}.
% \end{function}
%
%
% \begin{function}[updated = 2017-06-26]{\file_input:n, \file_input:V}
% \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 is raised if the file is not found.
% \end{function}
%
% \begin{function}[added = 2023-05-18, EXP]
% {\file_input_raw:n, \file_input_raw:V}
% \begin{syntax}
% \cs{file_input_raw: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 \TeX{} source. No data concerning the file is
% tracked. If the file is not found, no action is taken.
% \begin{texnote}
% This function is intended only for contexts where files must
% be read purely by expansion, for example at the start of a
% table cell in an \tn{halign}.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2014-07-02]
% {
% \file_if_exist_input:n,
% \file_if_exist_input:V,
% \file_if_exist_input:nF,
% \file_if_exist_input:VF
% }
% \begin{syntax}
% \cs{file_if_exist_input:n} \Arg{file name}
% \cs{file_if_exist_input:nF} \Arg{file name} \Arg{false code}
% \end{syntax}
% Searches for \meta{file name} using the current \TeX{} search
% path and the additional paths included in \cs{l_file_search_path_seq}.
% If found then
% reads in the file as additional \LaTeX{} source as described for
% \cs{file_input:n}, otherwise inserts the \meta{false code}.
% Note that these functions do not raise
% an error if the file is not found, in contrast to \cs{file_input:n}.
% \end{function}
%
% \begin{function}[added = 2017-07-07]{\file_input_stop:}
% \begin{syntax}
% \cs{file_input_stop:}
% \end{syntax}
% Ends the reading of a file started by \cs{file_input:n} or similar before
% the end of the file is reached. Where the file reading is being terminated
% due to an error, \cs[index = msg_critical:nn]{msg_critical:nn(nn)}
% should be preferred.
% \begin{texnote}
% This function must be used on a line on its own: \TeX{} reads files
% line-by-line and so any additional tokens in the \enquote{current} line
% will still be read.
%
% This is also true if the function is hidden inside another function
% (which will be the normal case), i.e., all tokens on the same line
% in the source file are still processed. Putting it on a line by itself
% in the definition doesn't help as it is the line where it is used that
% counts!
% \end{texnote}
% \end{function}
%
% \begin{function}{\file_show_list:, \file_log_list:}
% \begin{syntax}
% \cs{file_show_list:}
% \cs{file_log_list:}
% \end{syntax}
% These functions list all files loaded by \LaTeXe{} commands that
% populate \tn{@filelist} or by \cs{file_input:n}. While
% \cs{file_show_list:} displays the list in the terminal,
% \cs{file_log_list:} outputs it to the log file only.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3file} implementation}
%
% \TestFiles{m3file001}
%
% \begin{macrocode}
%<*package>
% \end{macrocode}
%
% \subsection{Input operations}
%
% \begin{macrocode}
%<@@=ior>
% \end{macrocode}
%
% \subsubsection{Variables and constants}
%
% \begin{variable}{\l_@@_internal_tl}
% Used as a short-term scratch variable.
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \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}
\int_const:Nn \c_@@_term_ior { 16 }
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_seq}
% A list of the currently-available input streams to be used as a
% stack.
% \begin{macrocode}
\seq_new:N \g_@@_streams_seq
% \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. To get the correct number of reserved streams in package mode the
% underlying mechanism needs to be queried. For \LaTeXe{} and plain \TeX{}
% this data is stored in |\count16|: with the \pkg{etex} package loaded
% we need to subtract $1$ as the register holds the number of the next
% stream to use. In \ConTeXt{}, we need to look at |\count38| but there
% is no subtraction: like the original plain \TeX{}/\LaTeXe{} mechanism
% it holds the value of the \emph{last} stream allocated.
% \begin{macrocode}
\prop_new:N \g_@@_streams_prop
\int_step_inline:nnn
{ 0 }
{
\cs_if_exist:NTF \contextversion
{ \tex_count:D 38 ~ }
{
\tex_count:D 16 ~ %
\cs_if_exist:NT \loccount { - 1 }
}
}
{
\prop_gput:Nnn \g_@@_streams_prop {#1} { Reserved~by~format }
}
% \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{variable}{\g_tmpa_ior, \g_tmpb_ior}
% The usual scratch space.
% \begin{macrocode}
\ior_new:N \g_tmpa_ior
\ior_new:N \g_tmpb_ior
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\ior_open:Nn, \ior_open:cn}
% Use the conditional version, with an error if the file is not found.
% \begin{macrocode}
\cs_new_protected:Npn \ior_open:Nn #1#2
{ \ior_open:NnF #1 {#2} { \__kernel_file_missing:n {#2} } }
\cs_generate_variant:Nn \ior_open:Nn { c }
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\l_@@_file_name_tl}
% Data storage.
% \begin{macrocode}
\tl_new:N \l_@@_file_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[TF]{\ior_open:Nn, \ior_open:cn}
% An auxiliary searches for the file in the \TeX{}, \LaTeXe{} and
% \LaTeX3 paths. Then pass the file found to the lower-level function
% which deals with streams. The |full_name| is empty when the file is
% not found.
% \begin{macrocode}
\prg_new_protected_conditional:Npnn \ior_open:Nn #1#2 { T , F , TF }
{
\file_get_full_name:nNTF {#2} \l_@@_file_name_tl
{
\__kernel_ior_open:No #1 \l_@@_file_name_tl
\prg_return_true:
}
{ \prg_return_false: }
}
\prg_generate_conditional_variant:Nnn \ior_open:Nn { c } { T , F , TF }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_new:N}
% Streams are reserved using \tn{newread} before they
% can be managed by \pkg{ior}. To prevent \pkg{ior} from being
% affected by redefinitions of \tn{newread} (such as done by the
% third-party package \pkg{morewrites}), this macro is saved here
% under a private name. The complicated code ensures that
% \cs{@@_new:N} is not \tn{outer} despite plain \TeX{}'s \tn{newread}
% being \tn{outer}. For \ConTeXt{}, we have to deal with the fact
% that \tn{newread} works like our own: it actually checks before
% altering definition.
% \begin{macrocode}
\exp_args:NNf \cs_new_protected:Npn \@@_new:N
{ \exp_args:NNc \exp_after:wN \exp_stop_f: { newread } }
\cs_if_exist:NT \contextversion
{
\cs_new_eq:NN \@@_new_aux:N \@@_new:N
\cs_gset_protected:Npn \@@_new:N #1
{
\cs_undefine:N #1
\@@_new_aux:N #1
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\__kernel_ior_open:Nn, \__kernel_ior_open:No}
% \begin{macro}{\@@_open_stream:Nn}
% The stream allocation itself uses the fact that there is a list of all of
% those available. 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 plain \TeX{} or \LaTeXe{}
% for a new stream and use that number (after a bit of conversion).
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_ior_open:Nn #1#2
{
\ior_close:N #1
\seq_gpop:NNTF \g_@@_streams_seq \l_@@_stream_tl
{ \@@_open_stream:Nn #1 {#2} }
{
\@@_new:N #1
\__kernel_tl_set:Ne \l_@@_stream_tl { \int_eval:n {#1} }
\@@_open_stream:Nn #1 {#2}
}
}
\cs_generate_variant:Nn \__kernel_ior_open:Nn { No }
% \end{macrocode}
% Here, we act defensively in case \LuaTeX{} is in use with an
% extensionless file name.
% \begin{macrocode}
\cs_new_protected:Npe \@@_open_stream:Nn #1#2
{
\tex_global:D \tex_chardef:D #1 = \exp_not:N \l_@@_stream_tl \scan_stop:
\prop_gput:NVn \exp_not:N \g_@@_streams_prop #1 {#2}
\tex_openin:D #1
\sys_if_engine_luatex:TF
{ {#2} }
{ \exp_not:N \__kernel_file_name_quote:n {#2} \scan_stop: }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_shell_open:Nn}
% \begin{macro}{\@@_shell_open:nN, \@@_shell_open:oN}
% Actually much easier than either the standard open or input versions!
% When calling \cs{__kernel_ior_open:Nn} the file the pipe is added to
% signal a shell command, but the quotes are not added yet---they are
% added later by \cs{__kernel_file_name_quote:n}.
% \begin{macrocode}
\cs_new_protected:Npn \ior_shell_open:Nn #1#2
{
\sys_if_shell:TF
{ \@@_shell_open:oN { \tl_to_str:n {#2} } #1 }
{ \msg_error:nn { kernel } { pipe-failed } }
}
\cs_new_protected:Npn \@@_shell_open:nN #1#2
{
\tl_if_in:nnTF {#1} { " }
{
\msg_error:nne
{ kernel } { quote-in-shell } {#1}
}
{ \__kernel_ior_open:Nn #2 { |#1 } }
}
\cs_generate_variant:Nn \@@_shell_open:nN { o }
\msg_new:nnnn { kernel } { pipe-failed }
{ Cannot~run~piped~system~commands. }
{
LaTeX~tried~to~call~a~system~process~but~this~was~not~possible.\\
Try~the~"--shell-escape"~(or~"--enable-pipes")~option.
}
% \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 { -1 < #1 < \c_@@_term_ior }
{
\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_show:N, \ior_log:N, \@@_show:NN}
% Seek the stream in the \cs{g_@@_streams_prop} list, then show the
% stream as open or closed accordingly.
% \begin{macrocode}
\cs_new_protected:Npn \ior_show:N { \@@_show:NN \tl_show:n }
\cs_generate_variant:Nn \ior_show:N { c }
\cs_new_protected:Npn \ior_log:N { \@@_show:NN \tl_log:n }
\cs_generate_variant:Nn \ior_log:N { c }
\cs_new_protected:Npn \@@_show:NN #1#2
{
\__kernel_chk_defined:NT #2
{
\prop_get:NVNTF \g_@@_streams_prop #2 \l_@@_internal_tl
{
\exp_args:Ne #1
{ \token_to_str:N #2 ~ open: ~ \l_@@_internal_tl }
}
{ \exp_args:Ne #1 { \token_to_str:N #2 ~ closed } }
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_show_list:, \ior_log_list:}
% \begin{macro}{\@@_list:N}
% Show the property lists, but with some \enquote{pretty printing}.
% See the \pkg{l3msg} module. The first argument of the message is
% |ior| (as opposed to |iow|) and the second is empty if no read
% stream is open and non-empty (the list of streams formatted using
% \cs{msg_show_item_unbraced:nn}) otherwise. The code of the message
% \texttt{show-streams} takes care of translating |ior|/|iow| to
% English.
% \begin{macrocode}
\cs_new_protected:Npn \ior_show_list: { \@@_list:N \msg_show:nneeee }
\cs_new_protected:Npn \ior_log_list: { \@@_list:N \msg_log:nneeee }
\cs_new_protected:Npn \@@_list:N #1
{
#1 { kernel } { show-streams }
{ ior }
{
\prop_map_function:NN \g_@@_streams_prop
\msg_show_item_unbraced:nn
}
{ } { }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Reading input}
%
% \begin{macro}{\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. The primitive test can only deal with
% numbers in the range $[0,15]$ so we catch outliers (they are
% exhausted).
% \begin{macrocode}
\prg_new_conditional:Npnn \ior_if_eof:N #1 { p , T , F , TF }
{
\if_int_compare:w -1 < #1
\if_int_compare:w #1 < \c_@@_term_ior
\if_eof:w #1
\prg_return_true:
\else:
\prg_return_false:
\fi:
\else:
\prg_return_true:
\fi:
\else:
\prg_return_true:
\fi:
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_get:NN, \@@_get:NN}
% \begin{macro}[TF]{\ior_get:NN}
% And here we read from files.
% \begin{macrocode}
\cs_new_protected:Npn \ior_get:NN #1#2
{ \ior_get:NNF #1 #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_new_protected:Npn \@@_get:NN #1#2
{ \tex_read:D #1 to #2 }
\prg_new_protected_conditional:Npnn \ior_get:NN #1#2 { T , F , TF }
{
\ior_if_eof:NTF #1
{ \prg_return_false: }
{
\@@_get:NN #1 #2
\prg_return_true:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_str_get:NN, \@@_str_get:NN}
% \begin{macro}[TF]{\ior_str_get:NN}
% Reading as strings is a more complicated wrapper, as we wish to
% remove the endline character and restore it afterwards.
% \begin{macrocode}
\cs_new_protected:Npn \ior_str_get:NN #1#2
{ \ior_str_get:NNF #1 #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_new_protected:Npn \@@_str_get:NN #1#2
{
\exp_args:Nno \use:n
{
\int_set:Nn \tex_endlinechar:D { -1 }
\tex_readline:D #1 to #2
\int_set:Nn \tex_endlinechar:D
} { \int_use:N \tex_endlinechar:D }
}
\prg_new_protected_conditional:Npnn \ior_str_get:NN #1#2 { T , F , TF }
{
\ior_if_eof:NTF #1
{ \prg_return_false: }
{
\@@_str_get:NN #1 #2
\prg_return_true:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\c_@@_term_noprompt_ior}
% For reading without a prompt.
% \begin{macrocode}
\int_const:Nn \c_@@_term_noprompt_ior { -1 }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\ior_get_term:nN, \ior_str_get_term:nN}
% \begin{macro}{\@@_get_term:NnN}
% Getting from the terminal is better with pretty-printing.
% \begin{macrocode}
\cs_new_protected:Npn \ior_get_term:nN #1#2
{ \@@_get_term:NnN \@@_get:NN {#1} #2 }
\cs_new_protected:Npn \ior_str_get_term:nN #1#2
{ \@@_get_term:NnN \@@_str_get:NN {#1} #2 }
\cs_new_protected:Npn \@@_get_term:NnN #1#2#3
{
\group_begin:
\tex_escapechar:D = -1 \scan_stop:
\tl_if_blank:nTF {#2}
{ \exp_args:NNc #1 \c_@@_term_noprompt_ior }
{ \exp_args:NNc #1 \c_@@_term_ior }
{#2}
\exp_args:NNNv \group_end:
\tl_set:Nn #3 {#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\ior_map_break:, \ior_map_break:n}
% Usual map breaking functions.
% \begin{macrocode}
\cs_new:Npn \ior_map_break:
{ \prg_map_break:Nn \ior_map_break: { } }
\cs_new:Npn \ior_map_break:n
{ \prg_map_break:Nn \ior_map_break: }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_map_inline:Nn, \ior_str_map_inline:Nn}
% \begin{macro}{\@@_map_inline:NNn}
% \begin{macro}{\@@_map_inline:NNNn}
% \begin{macro}{\@@_map_inline_loop:NNN}
% Mapping over an input stream can be done on either a token or a string
% basis, hence the set up. Within that, there is a check to avoid reading
% past the end of a file, hence the two applications of \cs{ior_if_eof:N}
% and its lower-level analogue \cs{if_eof:w}.
% This mapping cannot be nested with twice the same stream, as the
% stream has only one \enquote{current line}.
% \begin{macrocode}
\cs_new_protected:Npn \ior_map_inline:Nn
{ \@@_map_inline:NNn \@@_get:NN }
\cs_new_protected:Npn \ior_str_map_inline:Nn
{ \@@_map_inline:NNn \@@_str_get:NN }
\cs_new_protected:Npn \@@_map_inline:NNn
{
\int_gincr:N \g__kernel_prg_map_int
\exp_args:Nc \@@_map_inline:NNNn
{ @@_map_ \int_use:N \g__kernel_prg_map_int :n }
}
\cs_new_protected:Npn \@@_map_inline:NNNn #1#2#3#4
{
\cs_gset_protected:Npn #1 ##1 {#4}
\ior_if_eof:NF #3 { \@@_map_inline_loop:NNN #1#2#3 }
\prg_break_point:Nn \ior_map_break:
{ \int_gdecr:N \g__kernel_prg_map_int }
}
\cs_new_protected:Npn \@@_map_inline_loop:NNN #1#2#3
{
#2 #3 \l_@@_internal_tl
\if_eof:w #3
\exp_after:wN \ior_map_break:
\fi:
\exp_args:No #1 \l_@@_internal_tl
\@@_map_inline_loop:NNN #1#2#3
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_map_variable:NNn, \ior_str_map_variable:NNn}
% \begin{macro}{\@@_map_variable:NNNn}
% \begin{macro}{\@@_map_variable_loop:NNNn}
% Since the \TeX{} primitive (\tn{read} or \tn{readline}) assigns the
% tokens read in the same way as a token list assignment, we simply
% call the appropriate primitive. The end-of-loop is checked using
% the primitive conditional for speed.
% \begin{macrocode}
\cs_new_protected:Npn \ior_map_variable:NNn
{ \@@_map_variable:NNNn \ior_get:NN }
\cs_new_protected:Npn \ior_str_map_variable:NNn
{ \@@_map_variable:NNNn \ior_str_get:NN }
\cs_new_protected:Npn \@@_map_variable:NNNn #1#2#3#4
{
\ior_if_eof:NF #2 { \@@_map_variable_loop:NNNn #1#2#3 {#4} }
\prg_break_point:Nn \ior_map_break: { }
}
\cs_new_protected:Npn \@@_map_variable_loop:NNNn #1#2#3#4
{
#1 #2 #3
\if_eof:w #2
\exp_after:wN \ior_map_break:
\fi:
#4
\@@_map_variable_loop:NNNn #1#2#3 {#4}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \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}{\l_@@_internal_tl}
% Used as a short-term scratch variable.
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \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}). Recent \LuaTeX{} provide $128$ write
% streams; we also use \cs{c_term_iow} as the first non-allowed write
% stream so its value depends on the engine.
% \begin{macrocode}
\int_const:Nn \c_log_iow { -1 }
\int_const:Nn \c_term_iow
{
\bool_lazy_and:nnTF
{ \sys_if_engine_luatex_p: }
{ \int_compare_p:nNn \tex_luatexversion:D > { 80 } }
{ 128 }
{ 16 }
}
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_streams_seq}
% A list of the currently-available output streams to be used as a
% stack.
% \begin{macrocode}
\seq_new:N \g_@@_streams_seq
% \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 with the appropriate adjustment of the register numbers to
% check on.
% \begin{macrocode}
\prop_new:N \g_@@_streams_prop
\int_step_inline:nnn
{ 0 }
{
\cs_if_exist:NTF \contextversion
{ \tex_count:D 39 ~ }
{
\tex_count:D 17 ~
\cs_if_exist:NT \loccount { - 1 }
}
}
{
\prop_gput:Nnn \g_@@_streams_prop {#1} { Reserved~by~format }
}
% \end{macrocode}
% \end{variable}
%
% \subsubsection{Internal auxiliaries}
%
% \begin{variable}{\s_@@_mark,\s_@@_stop}
% Internal scan marks.
% \begin{macrocode}
\scan_new:N \s_@@_mark
\scan_new:N \s_@@_stop
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[EXP]{\@@_use_i_delimit_by_s_stop:nw}
% Functions to gobble up to a scan mark.
% \begin{macrocode}
\cs_new:Npn \@@_use_i_delimit_by_s_stop:nw #1 #2 \s_@@_stop {#1}
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\q_@@_nil}
% Internal quarks.
% \begin{macrocode}
\quark_new:N \q_@@_nil
% \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{variable}{\g_tmpa_iow, \g_tmpb_iow}
% The usual scratch space.
% \begin{macrocode}
\iow_new:N \g_tmpa_iow
\iow_new:N \g_tmpb_iow
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_new:N}
% As for read streams, copy \tn{newwrite}, making sure
% that it is not \tn{outer}. For \ConTeXt{}, we have to
% deal with the fact that \tn{newwrite} works like our
% own: it actually checks before altering definition.
% \begin{macrocode}
\exp_args:NNf \cs_new_protected:Npn \@@_new:N
{ \exp_args:NNc \exp_after:wN \exp_stop_f: { newwrite } }
\cs_if_exist:NT \contextversion
{
\cs_new_eq:NN \@@_new_aux:N \@@_new:N
\cs_gset_protected:Npn \@@_new:N #1
{
\cs_undefine:N #1
\@@_new_aux:N #1
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\l_@@_file_name_tl}
% Data storage.
% \begin{macrocode}
\tl_new:N \l_@@_file_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\iow_open:Nn, \iow_open:NV, \iow_open:cn, \iow_open:cV}
% \begin{macro}{\@@_open_stream:Nn, \@@_open_stream:NV}
% 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
{
\__kernel_tl_set:Ne \l_@@_file_name_tl
{ \__kernel_file_name_sanitize:n {#2} }
\iow_close:N #1
\seq_gpop:NNTF \g_@@_streams_seq \l_@@_stream_tl
{ \@@_open_stream:NV #1 \l_@@_file_name_tl }
{
\@@_new:N #1
\__kernel_tl_set:Ne \l_@@_stream_tl { \int_eval:n {#1} }
\@@_open_stream:NV #1 \l_@@_file_name_tl
}
}
\cs_generate_variant:Nn \iow_open:Nn { NV , c , cV }
\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 \__kernel_file_name_quote:n {#2} \scan_stop:
}
\cs_generate_variant:Nn \@@_open_stream:Nn { NV }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_shell_open:Nn}
% \begin{macro}{\@@_shell_open:nN, \@@_shell_open:oN}
% Very similar to the \texttt{ior} version
% \begin{macrocode}
\cs_new_protected:Npn \iow_shell_open:Nn #1#2
{
\sys_if_shell:TF
{ \@@_shell_open:oN { \tl_to_str:n {#2} } #1 }
{ \msg_error:nn { kernel } { pipe-failed } }
}
\cs_new_protected:Npn \@@_shell_open:nN #1#2
{
\tl_if_in:nnTF {#1} { " }
{
\msg_error:nne
{ kernel } { quote-in-shell } {#1}
}
{ \__kernel_iow_open:Nn #2 { |#1 } }
}
\cs_generate_variant:Nn \@@_shell_open:nN { o }
% \end{macrocode}
% \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_log_iow < #1 < \c_term_iow }
{
\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_iow
}
}
\cs_generate_variant:Nn \iow_close:N { c }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_show:N, \iow_log:N, \@@_show:NN}
% Seek the stream in the \cs{g_@@_streams_prop} list, then show the
% stream as open or closed accordingly.
% \begin{macrocode}
\cs_new_protected:Npn \iow_show:N { \@@_show:NN \tl_show:n }
\cs_generate_variant:Nn \iow_show:N { c }
\cs_new_protected:Npn \iow_log:N { \@@_show:NN \tl_log:n }
\cs_generate_variant:Nn \iow_log:N { c }
\cs_new_protected:Npn \@@_show:NN #1#2
{
\__kernel_chk_defined:NT #2
{
\prop_get:NVNTF \g_@@_streams_prop #2 \l_@@_internal_tl
{
\exp_args:Ne #1
{ \token_to_str:N #2 ~ open: ~ \l_@@_internal_tl }
}
{ \exp_args:Ne #1 { \token_to_str:N #2 ~ closed } }
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_show_list:, \iow_log_list:}
% \begin{macro}{\@@_list:N}
% Done as for input, but with a copy of the auxiliary so the name is correct.
% \begin{macrocode}
\cs_new_protected:Npn \iow_show_list: { \@@_list:N \msg_show:nneeee }
\cs_new_protected:Npn \iow_log_list: { \@@_list:N \msg_log:nneeee }
\cs_new_protected:Npn \@@_list:N #1
{
#1 { kernel } { show-streams }
{ iow }
{
\prop_map_function:NN \g_@@_streams_prop
\msg_show_item_unbraced:nn
}
{ } { }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Deferred writing}
%
% \begin{macro}
% {
% \iow_shipout_e:Nn, \iow_shipout_e:Ne,
% \iow_shipout_e:cn, \iow_shipout_e:ce
% }
% First the easy part, this is the primitive, which expects its
% argument to be braced.
% \begin{macrocode}
\cs_new_protected:Npn \iow_shipout_e:Nn #1#2
{ \tex_write:D #1 {#2} }
\cs_generate_variant:Nn \iow_shipout_e:Nn { Ne , c, ce }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}
% {
% \iow_shipout:Nn, \iow_shipout:Ne,
% \iow_shipout:Nx,
% \iow_shipout:cn, \iow_shipout:ce,
% \iow_shipout:cx
% }
% 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 { Ne , c, ce }
\cs_generate_variant:Nn \iow_shipout:Nn { Nx , cx }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Immediate writing}
%
% \begin{macro}{\__kernel_iow_with:Nnn}
% \begin{macro}{\@@_with:nNnn, \@@_with:oNnn}
% If the integer~|#1| is equal to~|#2|, just leave~|#3| in the input
% stream. Otherwise, pass the old value to an auxiliary, which sets
% the integer to the new value, runs the code, and restores the
% integer.
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_iow_with:Nnn #1#2
{
\int_compare:nNnTF {#1} = {#2}
{ \use:n }
{ \@@_with:oNnn { \int_use:N #1 } #1 {#2} }
}
\cs_new_protected:Npn \@@_with:nNnn #1#2#3#4
{
\int_set:Nn #2 {#3}
#4
\int_set:Nn #2 {#1}
}
\cs_generate_variant:Nn \@@_with:nNnn { o }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}
% {
% \iow_now:Nn, \iow_now:NV, \iow_now:Ne,
% \iow_now:Nx,
% \iow_now:cn, \iow_now:cV, \iow_now:ce,
% \iow_now:cx
% }
% 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. We set the \tn{newlinechar} to~$10$ using
% \cs{__kernel_iow_with:Nnn} to support formats such as plain \TeX{}: otherwise,
% \cs{iow_newline:} would not work. We do not do this for
% \cs{iow_shipout:Nn} or \cs{iow_shipout_x:Nn}, as \TeX{} looks at the
% value of the \tn{newlinechar} at shipout time in those cases.
% \begin{macrocode}
\cs_new_protected:Npn \iow_now:Nn #1#2
{
\__kernel_iow_with:Nnn \tex_newlinechar:D { `\^^J }
{ \tex_immediate:D \tex_write:D #1 { \exp_not:n {#2} } }
}
\cs_generate_variant:Nn \iow_now:Nn { NV , Ne , c , cV , ce }
\cs_generate_variant:Nn \iow_now:Nn { Nx , cx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_log:n, \iow_log:e, \iow_log:x}
% \begin{macro}{\iow_term:n, \iow_term:e, \iow_term:x}
% Writing to the log and the terminal directly are relatively easy;
% as we need the two \texttt{e}-type variants for bootstrapping,
% they are redefinitions here.
% \begin{macrocode}
\cs_new_protected:Npn \iow_log:n { \iow_now:Nn \c_log_iow }
\cs_set_protected:Npn \iow_log:e { \iow_now:Ne \c_log_iow }
\cs_generate_variant:Nn \iow_log:n { x }
\cs_new_protected:Npn \iow_term:n { \iow_now:Nn \c_term_iow }
\cs_set_protected:Npn \iow_term:e { \iow_now:Ne \c_term_iow }
\cs_generate_variant:Nn \iow_term:n { x }
% \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: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{variable}{\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 \hologo{MiKTeX}.
% \begin{macrocode}
\int_new:N \l_iow_line_count_int
\int_set:Nn \l_iow_line_count_int { 78 }
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_newline_tl}
% The token list inserted to produce a new line, with the
% \meta{run-on text}.
% \begin{macrocode}
\tl_new:N \l_@@_newline_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_line_target_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_@@_line_target_int
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_set_indent:n}
% \begin{macro}{\@@_unindent:w}
% \begin{variable}{\l_@@_one_indent_tl, \l_@@_one_indent_int}
% The \texttt{one_indent} variables hold one indentation marker and
% its length. The \cs{@@_unindent:w} auxiliary removes one
% indentation. The function \cs{@@_set_indent:n} (that could possibly
% be public) sets the indentation in a consistent way. We set it to
% four spaces by default.
% \begin{macrocode}
\tl_new:N \l_@@_one_indent_tl
\int_new:N \l_@@_one_indent_int
\cs_new:Npn \@@_unindent:w { }
\cs_new_protected:Npn \@@_set_indent:n #1
{
\__kernel_tl_set:Ne \l_@@_one_indent_tl
{ \exp_args:No \__kernel_str_to_other_fast:n { \tl_to_str:n {#1} } }
\int_set:Nn \l_@@_one_indent_int
{ \str_count:N \l_@@_one_indent_tl }
\exp_last_unbraced:NNo
\cs_set:Npn \@@_unindent:w \l_@@_one_indent_tl { }
}
\exp_args:Ne \@@_set_indent:n { \prg_replicate:nn { 4 } { ~ } }
% \end{macrocode}
% \end{variable}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\l_@@_indent_tl, \l_@@_indent_int}
% The current indentation (some copies of \cs{l_@@_one_indent_tl}) and
% its number of characters.
% \begin{macrocode}
\tl_new:N \l_@@_indent_tl
\int_new:N \l_@@_indent_int
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_line_tl, \l_@@_line_part_tl}
% These hold the current line of text and a partial line to be added
% to it, respectively.
% \begin{macrocode}
\tl_new:N \l_@@_line_tl
\tl_new:N \l_@@_line_part_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_line_break_bool}
% Indicates whether the line was broken precisely at a chunk boundary.
% \begin{macrocode}
\bool_new:N \l_@@_line_break_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\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{variable}
%
% \begin{variable}{\c_@@_wrap_marker_tl}
% \begin{variable}
% {
% \c_@@_wrap_end_marker_tl,
% \c_@@_wrap_newline_marker_tl,
% \c_@@_wrap_allow_break_marker_tl,
% \c_@@_wrap_indent_marker_tl,
% \c_@@_wrap_unindent_marker_tl
% }
% Every special action of the wrapping code is starts with
% 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
% marginally nicer.
% \begin{macrocode}
\group_begin:
\int_set:Nn \tex_escapechar:D { -1 }
\tl_const:Ne \c_@@_wrap_marker_tl
{ \tl_to_str:n { \^^I \^^O \^^W \^^_ \^^W \^^R \^^A \^^P } }
\group_end:
\tl_map_inline:nn
{ { end } { newline } { allow_break } { indent } { unindent } }
{
\tl_const:ce { c_@@_wrap_ #1 _marker_tl }
{
\c_@@_wrap_marker_tl
#1
\c_catcode_other_space_tl
}
}
% \end{macrocode}
% \end{variable}
% \end{variable}
%
% \begin{macro}{\iow_wrap_allow_break:}
% \begin{macro}[EXP]{\@@_wrap_allow_break:}
% \begin{macro}[EXP]{\@@_wrap_allow_break_error:}
% We set \cs{iow_wrap_allow_break:n} to produce an error when outside
% messages. Within wrapped message, it is set to \cs{@@_wrap_allow_break:}
% when valid and otherwise to \cs{@@_wrap_allow_break_error:}. The second
% produces an error expandably.
% \begin{macrocode}
\cs_new_protected:Npn \iow_wrap_allow_break:
{
\msg_error:nnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_wrap_allow_break: }
}
\cs_new:Npe \@@_wrap_allow_break: { \c_@@_wrap_allow_break_marker_tl }
\cs_new:Npn \@@_wrap_allow_break_error:
{
\msg_expandable_error:nnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_wrap_allow_break: }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_indent:n}
% \begin{macro}[EXP]{\@@_indent:n}
% \begin{macro}[EXP]{\@@_indent_error:n}
% We set \cs{iow_indent:n} to produce an error when outside
% messages. Within wrapped message, it is set to \cs{@@_indent:n} when
% valid and otherwise to \cs{@@_indent_error:n}. The first places the
% instruction for increasing the indentation before its argument, and
% the instruction for unindenting afterwards. The second produces an
% error expandably. Note that there are 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
{
\msg_error:nnnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_indent:n } {#1}
#1
}
\cs_new:Npe \@@_indent:n #1
{
\c_@@_wrap_indent_marker_tl
#1
\c_@@_wrap_unindent_marker_tl
}
\cs_new:Npn \@@_indent_error:n #1
{
\msg_expandable_error:nnnnn { kernel } { iow-indent }
{ \iow_wrap:nnnN } { \iow_indent:n } {#1}
#1
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_wrap:nnnN, \iow_wrap:nenN}
% The main wrapping function works as follows. First give |\\|,
% \verb*|\ | and other formatting commands the correct definition for
% messages and perform the given setup~|#3|. The definition of
% \verb*|\ | uses 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.
% Use \cs{conditionally@traceoff} if defined; it is introduced by the
% \pkg{trace} package and suppresses uninteresting tracing of the
% wrapping code.
% \begin{macrocode}
\cs_new_protected:Npn \iow_wrap:nnnN #1#2#3#4
{
\group_begin:
\cs_if_exist_use:N \conditionally@traceoff
\int_set:Nn \tex_escapechar:D { -1 }
\cs_set:Npe \{ { \token_to_str:N \{ }
\cs_set:Npe \# { \token_to_str:N \# }
\cs_set:Npe \} { \token_to_str:N \} }
\cs_set:Npe \% { \token_to_str:N \% }
\cs_set:Npe \~ { \token_to_str:N \~ }
\int_set:Nn \tex_escapechar:D { 92 }
\cs_set_eq:NN \\ \iow_newline:
\cs_set_eq:NN \ \c_catcode_other_space_tl
\cs_set_eq:NN \iow_wrap_allow_break: \@@_wrap_allow_break:
\cs_set_eq:NN \iow_indent:n \@@_indent:n
#3
% \end{macrocode}
% Then fully-expand the input: in package mode, the expansion uses
% \LaTeXe{}'s \tn{protect} mechanism in the same way as \tn{typeout}.
% In generic mode this setting is useless but harmless. As soon as
% the expansion is done, reset \cs{iow_indent:n} to its error
% definition: it only works in the first argument of
% \cs{iow_wrap:nnnN}.
% \begin{macrocode}
\cs_set_eq:NN \protect \token_to_str:N
\__kernel_tl_set:Ne \l_@@_wrap_tl {#1}
\cs_set_eq:NN \iow_wrap_allow_break: \@@_wrap_allow_break_error:
\cs_set_eq:NN \iow_indent:n \@@_indent_error:n
% \end{macrocode}
% Afterwards, set the newline marker (two assignments to fully expand,
% then convert to a string) and initialize the target count for lines
% (the first line has target count \cs{l_iow_line_count_int} instead).
% \begin{macrocode}
\__kernel_tl_set:Ne \l_@@_newline_tl { \iow_newline: #2 }
\__kernel_tl_set:Ne \l_@@_newline_tl { \tl_to_str:N \l_@@_newline_tl }
\int_set:Nn \l_@@_line_target_int
{ \l_iow_line_count_int - \str_count:N \l_@@_newline_tl + 1 }
% \end{macrocode}
% Sanity check.
% \begin{macrocode}
\int_compare:nNnT { \l_@@_line_target_int } < 0
{
\tl_set:Nn \l_@@_newline_tl { \iow_newline: }
\int_set:Nn \l_@@_line_target_int
{ \l_iow_line_count_int + 1 }
}
% \end{macrocode}
% There is then a loop over the input, which stores the wrapped
% result in \cs{l_@@_wrap_tl}. After the loop, the resulting text is
% passed on to the function which has been given as a post-processor.
% The \cs{tl_to_str:N} step converts the \enquote{other} spaces back
% to normal spaces. The \texttt{f}-expansion removes a leading space
% from \cs{l_@@_wrap_tl}.
% \begin{macrocode}
\@@_wrap_do:
\exp_args:NNf \group_end:
#4 { \tl_to_str:N \l_@@_wrap_tl }
}
\cs_generate_variant:Nn \iow_wrap:nnnN { ne }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_do:, \@@_wrap_fix_newline:w, \@@_wrap_start:w}
% Escape spaces and change newlines to \cs{c_@@_wrap_newline_marker_tl}.
% Set up a few variables, in particular the initial
% value of \cs{l_@@_wrap_tl}: the space stops the
% \texttt{f}-expansion of the main wrapping function and
% \cs{use_none:n} removes a newline marker inserted by later code.
% The main loop consists of repeatedly calling the \texttt{chunk}
% auxiliary to wrap chunks delimited by (newline or indentation)
% markers.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_do:
{
\__kernel_tl_set:Ne \l_@@_wrap_tl
{
\exp_args:No \__kernel_str_to_other_fast:n \l_@@_wrap_tl
\c_@@_wrap_end_marker_tl
}
\__kernel_tl_set:Ne \l_@@_wrap_tl
{
\exp_after:wN \@@_wrap_fix_newline:w \l_@@_wrap_tl
^^J \q_@@_nil ^^J \s_@@_stop
}
\exp_after:wN \@@_wrap_start:w \l_@@_wrap_tl
}
\cs_new:Npn \@@_wrap_fix_newline:w #1 ^^J #2 ^^J
{
#1
\if_meaning:w \q_@@_nil #2
\@@_use_i_delimit_by_s_stop:nw
\fi:
\c_@@_wrap_newline_marker_tl
\@@_wrap_fix_newline:w #2 ^^J
}
\cs_new_protected:Npn \@@_wrap_start:w
{
\bool_set_false:N \l_@@_line_break_bool
\tl_clear:N \l_@@_line_tl
\tl_clear:N \l_@@_line_part_tl
\tl_set:Nn \l_@@_wrap_tl { ~ \use_none:n }
\int_zero:N \l_@@_indent_int
\tl_clear:N \l_@@_indent_tl
\@@_wrap_chunk:nw { \l_iow_line_count_int }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_chunk:nw, \@@_wrap_next:nw}
% The \texttt{chunk} and \texttt{next} auxiliaries are defined
% indirectly to obtain the expansions of \cs{c_catcode_other_space_tl}
% and \cs{c_@@_wrap_marker_tl} in their definition. The \texttt{next}
% auxiliary calls a function corresponding to the type of marker (its
% |##2|), which can be \texttt{newline} or \texttt{indent} or
% \texttt{unindent} or \texttt{end}. The first argument of the
% \texttt{chunk} auxiliary is a target number of characters and the
% second is some string to wrap. If the chunk is empty simply call
% \texttt{next}. Otherwise, set up a call to \cs{@@_wrap_line:nw},
% including the indentation if the current line is empty, and
% including a trailing space (|#1|) before the
% \cs{@@_wrap_end_chunk:w} auxiliary.
% \begin{macrocode}
\cs_set_protected:Npn \@@_tmp:w #1#2
{
\cs_new_protected:Npn \@@_wrap_chunk:nw ##1##2 #2
{
\tl_if_empty:nTF {##2}
{
\tl_clear:N \l_@@_line_part_tl
\@@_wrap_next:nw {##1}
}
{
\tl_if_empty:NTF \l_@@_line_tl
{
\@@_wrap_line:nw
{ \l_@@_indent_tl }
##1 - \l_@@_indent_int ;
}
{ \@@_wrap_line:nw { } ##1 ; }
##2 #1
\@@_wrap_end_chunk:w 7 6 5 4 3 2 1 0 \s_@@_stop
}
}
\cs_new_protected:Npn \@@_wrap_next:nw ##1##2 #1
{ \use:c { @@_wrap_##2:n } {##1} }
}
\exp_args:NVV \@@_tmp:w \c_catcode_other_space_tl \c_@@_wrap_marker_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_line:nw}
% \begin{macro}[EXP]
% {
% \@@_wrap_line_loop:w,
% \@@_wrap_line_aux:Nw,
% \@@_wrap_line_seven:nnnnnnn,
% \@@_wrap_line_end:NnnnnnnnN,
% \@@_wrap_line_end:nw,
% \@@_wrap_end_chunk:w
% }
% This is followed by \Arg{string} \meta{int expr} |;|. It stores the
% \meta{string} and up to \meta{int expr} characters from the current
% chunk into \cs{l_@@_line_part_tl}. Characters are grabbed 8~at a
% time and left in \cs{l_@@_line_part_tl} by the \texttt{line_loop}
% auxiliary. When $k<8$ remain to be found, the \texttt{line_aux}
% auxiliary calls the \texttt{line_end} auxiliary followed by (the
% single digit) $k$, then $7-k$ empty brace groups, then the chunk's
% remaining characters. The \texttt{line_end} auxiliary leaves
% $k$~characters from the chunk in the line part, then ends the
% assignment. Ignore the \cs{use_none:nnnnn} line for now. If the
% next character is a space the line can be broken there:
% store what we found into the result and get the next line.
% Otherwise some work is needed to find a break-point. So far we have
% ignored what happens if the chunk is shorter than the requested
% number of characters: this is dealt with by the \texttt{end_chunk}
% auxiliary, which gets treated like a character by the rest of the
% code. It ends up being called either as one of the arguments
% |#2|--|#9| of the \texttt{line_loop} auxiliary or as one of the
% arguments |#2|--|#8| of the \texttt{line_end} auxiliary. In both
% cases stop the assignment and work out how many characters are still
% needed. Notice that when we have exactly seven arguments to clean up,
% a \cs{exp_stop_f:} has to be inserted to stop the \cs{exp:w}.
% The weird \cs{use_none:nnnnn} ensures that the required
% data is in the right place.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_line:nw #1
{
\tex_edef:D \l_@@_line_part_tl { \if_false: } \fi:
#1
\exp_after:wN \@@_wrap_line_loop:w
\int_value:w \int_eval:w
}
\cs_new:Npn \@@_wrap_line_loop:w #1 ; #2#3#4#5#6#7#8#9
{
\if_int_compare:w #1 < 8 \exp_stop_f:
\@@_wrap_line_aux:Nw #1
\fi:
#2 #3 #4 #5 #6 #7 #8 #9
\exp_after:wN \@@_wrap_line_loop:w
\int_value:w \int_eval:w #1 - 8 ;
}
\cs_new:Npn \@@_wrap_line_aux:Nw #1#2#3 \exp_after:wN #4 ;
{
#2
\exp_after:wN \@@_wrap_line_end:NnnnnnnnN
\exp_after:wN #1
\exp:w \exp_end_continue_f:w
\exp_after:wN \exp_after:wN
\if_case:w #1 \exp_stop_f:
\prg_do_nothing:
\or: \use_none:n
\or: \use_none:nn
\or: \use_none:nnn
\or: \use_none:nnnn
\or: \use_none:nnnnn
\or: \use_none:nnnnnn
\or: \@@_wrap_line_seven:nnnnnnn
\fi:
{ } { } { } { } { } { } { } #3
}
\cs_new:Npn \@@_wrap_line_seven:nnnnnnn #1#2#3#4#5#6#7 { \exp_stop_f: }
\cs_new:Npn \@@_wrap_line_end:NnnnnnnnN #1#2#3#4#5#6#7#8#9
{
#2 #3 #4 #5 #6 #7 #8
\use_none:nnnnn \int_eval:w 8 - ; #9
\token_if_eq_charcode:NNTF \c_space_token #9
{ \@@_wrap_line_end:nw { } }
{ \if_false: { \fi: } \@@_wrap_break:w #9 }
}
\cs_new:Npn \@@_wrap_line_end:nw #1
{
\if_false: { \fi: }
\@@_wrap_store_do:n {#1}
\@@_wrap_next_line:w
}
\cs_new:Npn \@@_wrap_end_chunk:w
#1 \int_eval:w #2 - #3 ; #4#5 \s_@@_stop
{
\if_false: { \fi: }
\exp_args:Nf \@@_wrap_next:nw { \int_eval:n { #2 - #4 } }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_wrap_break:w}
% \begin{macro}[EXP]
% {
% \@@_wrap_break_first:w,
% \@@_wrap_break_none:w,
% \@@_wrap_break_loop:w,
% \@@_wrap_break_end:w,
% }
% Functions here are defined indirectly: \cs{@@_tmp:w} is eventually
% called with an \enquote{other} space as its argument. The goal is
% to remove from \cs{l_@@_line_part_tl} the part after the last space.
% In most cases this is done by repeatedly calling the
% \texttt{break_loop} auxiliary, which leaves \enquote{words}
% (delimited by spaces) until it hits the trailing space: then its
% argument |##3| is |?| \cs{@@_wrap_break_end:w} instead of a single
% token, and that \texttt{break_end} auxiliary leaves in the
% assignment the line until the last space, then calls
% \cs{@@_wrap_line_end:nw} to finish up the line and move on to the
% next. If there is no space in \cs{l_@@_line_part_tl} then the
% \texttt{break_first} auxiliary calls the \texttt{break_none}
% auxiliary. In that case, if the current line is empty, the complete
% word (including |##4|, characters beyond what we had grabbed) is
% added to the line, making it over-long. Otherwise, the word is
% used for the following line (and the last space of the line so far
% is removed because it was inserted due to the presence of a marker).
% \begin{macrocode}
\cs_set_protected:Npn \@@_tmp:w #1
{
\cs_new:Npn \@@_wrap_break:w
{
\tex_edef:D \l_@@_line_part_tl
{ \if_false: } \fi:
\exp_after:wN \@@_wrap_break_first:w
\l_@@_line_part_tl
#1
{ ? \@@_wrap_break_end:w }
\s_@@_mark
}
\cs_new:Npn \@@_wrap_break_first:w ##1 #1 ##2
{
\use_none:nn ##2 \@@_wrap_break_none:w
\@@_wrap_break_loop:w ##1 #1 ##2
}
\cs_new:Npn \@@_wrap_break_none:w ##1##2 #1 ##3 \s_@@_mark ##4 #1
{
\tl_if_empty:NTF \l_@@_line_tl
{ ##2 ##4 \@@_wrap_line_end:nw { } }
{ \@@_wrap_line_end:nw { \@@_wrap_trim:N } ##2 ##4 #1 }
}
\cs_new:Npn \@@_wrap_break_loop:w ##1 #1 ##2 #1 ##3
{
\use_none:n ##3
##1 #1
\@@_wrap_break_loop:w ##2 #1 ##3
}
\cs_new:Npn \@@_wrap_break_end:w ##1 #1 ##2 ##3 #1 ##4 \s_@@_mark
{ ##1 \@@_wrap_line_end:nw { } ##3 }
}
\exp_args:NV \@@_tmp:w \c_catcode_other_space_tl
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_wrap_next_line:w}
% The special case where the end of a line coincides with the end of a
% chunk is detected here, to avoid a spurious empty line. Otherwise,
% call \cs{@@_wrap_line:nw} to find characters for the next line
% (remembering to account for the indentation).
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_next_line:w #1#2 \s_@@_stop
{
\tl_clear:N \l_@@_line_tl
\token_if_eq_meaning:NNTF #1 \@@_wrap_end_chunk:w
{
\tl_clear:N \l_@@_line_part_tl
\bool_set_true:N \l_@@_line_break_bool
\@@_wrap_next:nw { \l_@@_line_target_int }
}
{
\@@_wrap_line:nw
{ \l_@@_indent_tl }
\l_@@_line_target_int - \l_@@_indent_int ;
#1 #2 \s_@@_stop
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_allow_break:n}
% This is called after a chunk has been wrapped. The
% \cs{l_@@_line_part_tl} typically ends with a space (except at the
% beginning of a line?), which we remove since the
% \texttt{allow\_break} marker should not insert a space. Then move
% on with the next chunk, making sure to adjust the target number of
% characters for the line in case we did remove a space.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_allow_break:n #1
{
\__kernel_tl_set:Ne \l_@@_line_tl
{ \l_@@_line_tl \@@_wrap_trim:N \l_@@_line_part_tl }
\bool_set_false:N \l_@@_line_break_bool
\tl_if_empty:NTF \l_@@_line_part_tl
{ \@@_wrap_chunk:nw {#1} }
{ \exp_args:Nf \@@_wrap_chunk:nw { \int_eval:n { #1 + 1 } } }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_indent:n, \@@_wrap_unindent:n}
% These functions are called after a chunk has been wrapped, when
% encountering \texttt{indent}/\texttt{unindent} markers. Add the
% line part (last line part of the previous chunk) to the line so far
% and reset a boolean denoting the presence of a line-break. Most
% importantly, add or remove one indent from the current indent (both
% the integer and the token list). Finally, continue wrapping.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_indent:n #1
{
\tl_put_right:Ne \l_@@_line_tl { \l_@@_line_part_tl }
\bool_set_false:N \l_@@_line_break_bool
\int_add:Nn \l_@@_indent_int { \l_@@_one_indent_int }
\tl_put_right:No \l_@@_indent_tl { \l_@@_one_indent_tl }
\@@_wrap_chunk:nw {#1}
}
\cs_new_protected:Npn \@@_wrap_unindent:n #1
{
\tl_put_right:Ne \l_@@_line_tl { \l_@@_line_part_tl }
\bool_set_false:N \l_@@_line_break_bool
\int_sub:Nn \l_@@_indent_int { \l_@@_one_indent_int }
\__kernel_tl_set:Ne \l_@@_indent_tl
{ \exp_after:wN \@@_unindent:w \l_@@_indent_tl }
\@@_wrap_chunk:nw {#1}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_newline:n, \@@_wrap_end:n}
% These functions are called after a chunk has been line-wrapped, when
% encountering a \texttt{newline}/\texttt{end} marker. Unless we just
% took a line-break, store the line part and the line so far into the
% whole \cs{l_@@_wrap_tl}, trimming a trailing space. In the
% \texttt{newline} case look for a new line (of length
% \cs{l_@@_line_target_int}) in a new chunk.
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_newline:n #1
{
\bool_if:NF \l_@@_line_break_bool
{ \@@_wrap_store_do:n { \@@_wrap_trim:N } }
\bool_set_false:N \l_@@_line_break_bool
\@@_wrap_chunk:nw { \l_@@_line_target_int }
}
\cs_new_protected:Npn \@@_wrap_end:n #1
{
\bool_if:NF \l_@@_line_break_bool
{ \@@_wrap_store_do:n { \@@_wrap_trim:N } }
\bool_set_false:N \l_@@_line_break_bool
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_wrap_store_do:n}
% First add the last line part to the line, then append it to
% \cs{l_@@_wrap_tl} with the appropriate new line (with
% \enquote{run-on} text), possibly with its last space removed (|#1|
% is empty or \cs{@@_wrap_trim:N}).
% \begin{macrocode}
\cs_new_protected:Npn \@@_wrap_store_do:n #1
{
\__kernel_tl_set:Ne \l_@@_line_tl
{ \l_@@_line_tl \l_@@_line_part_tl }
\__kernel_tl_set:Ne \l_@@_wrap_tl
{
\l_@@_wrap_tl
\l_@@_newline_tl
#1 \l_@@_line_tl
}
\tl_clear:N \l_@@_line_tl
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_wrap_trim:N, \@@_wrap_trim:w, \@@_wrap_trim_aux:w}
% Remove one trailing \enquote{other} space from the argument if present.
% \begin{macrocode}
\cs_set_protected:Npn \@@_tmp:w #1
{
\cs_new:Npn \@@_wrap_trim:N ##1
{ \exp_after:wN \@@_wrap_trim:w ##1 \s_@@_mark #1 \s_@@_mark \s_@@_stop }
\cs_new:Npn \@@_wrap_trim:w ##1 #1 \s_@@_mark
{ \@@_wrap_trim_aux:w ##1 \s_@@_mark }
\cs_new:Npn \@@_wrap_trim_aux:w ##1 \s_@@_mark ##2 \s_@@_stop {##1}
}
\exp_args:NV \@@_tmp:w \c_catcode_other_space_tl
% \end{macrocode}
% \end{macro}
%
% \subsection{Deprecated functions}
%
% \begin{macro}
% {
% \iow_shipout_x:Nn, \iow_shipout_x:Nx,
% \iow_shipout_x:cn, \iow_shipout_x:cx
% }
% Previously described as \texttt{x}-type, but the hash behaviour is really
% \texttt{e}-type.
% \begin{macrocode}
\cs_new_eq:NN \iow_shipout_x:Nn \iow_shipout_e:Nn
\cs_generate_variant:Nn \iow_shipout_x:Nn { Nx , c, cx }
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%<@@=file>
% \end{macrocode}
%
% \subsection{File operations}
%
% \begin{variable}{\l_@@_internal_tl}
% Used as a short-term scratch variable.
% \begin{macrocode}
\tl_new:N \l_@@_internal_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}
% {
% \g_file_curr_dir_str ,
% \g_file_curr_ext_str ,
% \g_file_curr_name_str
% }
% The name of the current file should be available at all times:
% the name itself is set dynamically.
% \begin{macrocode}
\str_new:N \g_file_curr_dir_str
\str_new:N \g_file_curr_ext_str
\str_new:N \g_file_curr_name_str
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_stack_seq}
% The input list of files is stored as a sequence stack. In package
% mode we can recover the information from the details held by
% \LaTeXe{} (we must be in the preamble and loaded using \tn{usepackage}
% or \tn{RequirePackage}). As \LaTeXe{} doesn't store directory and
% name separately, we stick to the same convention here. In pre-loading,
% \tn{@currnamestack} is empty so is skipped.
% \begin{macrocode}
\seq_new:N \g_@@_stack_seq
\group_begin:
\cs_set_protected:Npn \@@_tmp:w #1#2#3
{
\tl_if_blank:nTF {#1}
{
\cs_set:Npn \@@_tmp:w ##1 " ##2 " ##3 \s_@@_stop
{ { } {##2} { } }
\seq_gput_right:Ne \g_@@_stack_seq
{
\exp_after:wN \@@_tmp:w \tex_jobname:D
" \tex_jobname:D " \s_@@_stop
}
}
{
\seq_gput_right:Nn \g_@@_stack_seq { { } {#1} {#2} }
\@@_tmp:w
}
}
\cs_if_exist:NT \@currnamestack
{
\tl_if_empty:NF \@currnamestack
{ \exp_after:wN \@@_tmp:w \@currnamestack }
}
\group_end:
% \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! We
% will eventually copy the contents of \cs{@filelist}.
% \begin{macrocode}
\seq_new:N \g_@@_record_seq
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_base_name_tl, \l_@@_full_name_tl}
% For storing the basename and full path whilst passing data internally.
% \begin{macrocode}
\tl_new:N \l_@@_base_name_tl
\tl_new:N \l_@@_full_name_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_dir_str, \l_@@_ext_str, \l_@@_name_str}
% Used in parsing a path into parts: in contrast to the above, these are
% never used outside of the current module.
% \begin{macrocode}
\str_new:N \l_@@_dir_str
\str_new:N \l_@@_ext_str
\str_new:N \l_@@_name_str
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_file_search_path_seq}
% The current search path.
% \begin{macrocode}
\seq_new:N \l_file_search_path_seq
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_tmp_seq}
% Scratch space for comma list conversion.
% \begin{macrocode}
\seq_new:N \l_@@_tmp_seq
% \end{macrocode}
% \end{variable}
%
% \subsubsection{Internal auxiliaries}
%
% \begin{variable}{\s_@@_stop}
% Internal scan marks.
% \begin{macrocode}
\scan_new:N \s_@@_stop
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\q_@@_nil}
% Internal quarks.
% \begin{macrocode}
\quark_new:N \q_@@_nil
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[pTF]{\@@_quark_if_nil:n}
% Branching quark conditional.
% \begin{macrocode}
\__kernel_quark_new_conditional:Nn \@@_quark_if_nil:n { TF }
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\q_@@_recursion_tail,\q_@@_recursion_stop}
% Internal recursion quarks.
% \begin{macrocode}
\quark_new:N \q_@@_recursion_tail
\quark_new:N \q_@@_recursion_stop
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[EXP]{
% \@@_if_recursion_tail_break:NN,
% \@@_if_recursion_tail_stop_do:Nn
% }
% Functions to query recursion quarks.
% \begin{macrocode}
\__kernel_quark_new_test:N \@@_if_recursion_tail_stop:N
\__kernel_quark_new_test:N \@@_if_recursion_tail_stop_do:nn
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\__kernel_file_name_sanitize:n}
% \begin{macro}[EXP]{
% \@@_name_expand:n,
% \@@_name_expand_cleanup:Nw,
% \@@_name_expand_cleanup:w,
% \@@_name_expand_end:,
% \@@_name_expand_error:Nw,
% \@@_name_expand_error_aux:Nw,
% }
% \begin{macro}[EXP]{
% \@@_name_strip_quotes:n,
% \@@_name_strip_quotes:nnnw,
% \@@_name_strip_quotes:nnn,
% }
% \begin{macro}[EXP]{
% \@@_name_trim_spaces:n,
% \@@_name_trim_spaces:nw,
% \@@_name_trim_spaces_aux:n,
% \@@_name_trim_spaces_aux:w,
% }
% Expanding the file name uses a \tn{csname}-based approach, and
% relies on active characters (for example from UTF-8 characters)
% being properly set up to expand to a expansion-safe version using
% \cs{ifcsname}. This is less conservative than the token-by-token
% approach used before, but it is much faster.
% \begin{macrocode}
\cs_new:Npn \__kernel_file_name_sanitize:n #1
{
\exp_args:Ne \@@_name_trim_spaces:n
{
\exp_args:Ne \@@_name_strip_quotes:n
{ \@@_name_expand:n {#1} }
}
}
% \end{macrocode}
%
% We'll use \cs{cs:w} to start expanding the file name, and to avoid
% creating csnames equal to \tn{relax} with \enquote{common} names,
% there's a prefix |__file_name=| to the csname. There's also a guard
% token at the end so we can check if there was an error during the
% process and (try to) clean up gracefully.
% \begin{macrocode}
\cs_new:Npn \@@_name_expand:n #1
{
\exp_after:wN \@@_name_expand_cleanup:Nw
\cs:w @@_name = #1 \cs_end:
\@@_name_expand_end:
}
% \end{macrocode}
% With the csname built, we grab it, and grab the remaining tokens
% delimited by \cs{@@_name_expand_end:}. If there are any remaining
% tokens, something bad happened, so we'll call the error procedure
% \cs{@@_name_expand_error:Nw}.
% If everything went according to plan, then use \cs{token_to_str:N}
% on the csname built, and call \cs{@@_name_expand_cleanup:w} to
% remove the prefix we added a while back.
% \cs{@@_name_expand_cleanup:w} takes a leading argument so we don't
% have to bother about the value of \cs{tex_escapechar:D}.
% \begin{macrocode}
\cs_new:Npn \@@_name_expand_cleanup:Nw #1 #2 \@@_name_expand_end:
{
\tl_if_empty:nF {#2}
{ \@@_name_expand_error:Nw #2 \@@_name_expand_end: }
\exp_after:wN \@@_name_expand_cleanup:w \token_to_str:N #1
}
\exp_last_unbraced:NNNNo
\cs_new:Npn \@@_name_expand_cleanup:w #1 \tl_to_str:n { @@_name = } { }
% \end{macrocode}
% In non-error cases \cs{@@_name_expand_end:} should not expand. It
% will only do so in case there is a \cs{csname} too much in the file
% name, so it will throw an error (while expanding), then insert the
% missing \cs{cs_end:} and yet another \cs{@@_name_expand_end:} that
% will be used as a delimiter by \cs{@@_name_expand_cleanup:Nw} (or
% that will expand again if yet another \cs{endcsname} is missing).
% \begin{macrocode}
\cs_new:Npn \@@_name_expand_end:
{
\msg_expandable_error:nn
{ kernel } { filename-missing-endcsname }
\cs_end: \@@_name_expand_end:
}
% \end{macrocode}
% Now to the error case. \cs{@@_name_expand_error:Nw} adds an extra
% \cs{cs_end:} so that in case there was an extra \tn{csname} in the
% file name, then \cs{@@_name_expand_error_aux:Nw} throws the error.
% \begin{macrocode}
\cs_new:Npn \@@_name_expand_error:Nw #1 #2 \@@_name_expand_end:
{ \@@_name_expand_error_aux:Nw #1 #2 \cs_end: \@@_name_expand_end: }
\cs_new:Npn \@@_name_expand_error_aux:Nw #1 #2 \cs_end: #3
\@@_name_expand_end:
{
\msg_expandable_error:nnff
{ kernel } { filename-chars-lost }
{ \token_to_str:N #1 } { \exp_stop_f: #2 }
}
% \end{macrocode}
% Quoting file name uses basically the same approach as for
% \texttt{luaquotejobname}: count the |"| tokens and remove them.
% \begin{macrocode}
\cs_new:Npn \@@_name_strip_quotes:n #1
{
\@@_name_strip_quotes:nw { 0 }
#1 " \q_@@_recursion_tail " \q_@@_recursion_stop {#1}
}
\cs_new:Npn \@@_name_strip_quotes:nw #1#2 "
{
\if_meaning:w \q_@@_recursion_tail #2
\@@_name_strip_quotes_end:wnwn
\fi:
#2
\@@_name_strip_quotes:nw { #1 + 1 }
}
\cs_new:Npn \@@_name_strip_quotes_end:wnwn \fi: #1
\@@_name_strip_quotes:nw #2 \q_@@_recursion_stop #3
{
\fi:
\int_if_odd:nT {#2}
{
\msg_expandable_error:nnn
{ kernel } { unbalanced-quote-in-filename } {#3}
}
}
% \end{macrocode}
% Spaces need to be trimmed from the start of the name and from the end of
% any extension. However, the name we are passed might not have an extension:
% that means we have to look for one. If there is no extension, we still use
% the standard trimming function but deliberately prevent any spaces being
% removed at the end.
% \begin{macrocode}
\cs_new:Npn \@@_name_trim_spaces:n #1
{ \@@_name_trim_spaces:nw {#1} #1 . \q_@@_nil . \s_@@_stop }
\cs_new:Npn \@@_name_trim_spaces:nw #1#2 . #3 . #4 \s_@@_stop
{
\@@_quark_if_nil:nTF {#3}
{
\tl_trim_spaces_apply:nN { #1 \s_@@_stop }
\@@_name_trim_spaces_aux:n
}
{ \tl_trim_spaces:n {#1} }
}
\cs_new:Npn \@@_name_trim_spaces_aux:n #1
{ \@@_name_trim_spaces_aux:w #1 }
\cs_new:Npn \@@_name_trim_spaces_aux:w #1 \s_@@_stop {#1}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[EXP]{\__kernel_file_name_quote:n}
% \begin{macro}[EXP]{\@@_name_quote:nw}
% \begin{macrocode}
\cs_new:Npn \__kernel_file_name_quote:n #1
{ \@@_name_quote:nw {#1} #1 ~ \q_@@_nil \s_@@_stop }
\cs_new:Npn \@@_name_quote:nw #1 #2 ~ #3 \s_@@_stop
{
\@@_quark_if_nil:nTF {#3}
{ #1 }
{ "#1" }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\c_@@_marker_tl}
% The same idea as the marker for rescanning token lists: this pair of
% tokens cannot appear in a file that is being input.
% \begin{macrocode}
\tl_const:Ne \c_@@_marker_tl { : \token_to_str:N : }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[TF]{\file_get:nnN, \file_get:VnN}
% \begin{macro}{\file_get:nnN,\@@_get_aux:nnN,\@@_get_do:Nw}
% The approach here is similar to that for \cs{tl_set_rescan:Nnn}.
% The file contents are grabbed as an argument delimited by
% \cs{c_@@_marker_tl}. A few subtleties: braces in \cs{if_false:}
% \ldots{} \cs{fi:} to deal with possible alignment tabs,
% \tn{tracingnesting} to avoid a warning about a group being closed
% inside the \tn{scantokens}, and \cs{prg_return_true:} is placed
% after the end-of-file marker.
% \begin{macrocode}
\cs_new_protected:Npn \file_get:nnN #1#2#3
{
\file_get:nnNF {#1} {#2} #3
{ \tl_set:Nn #3 { \q_no_value } }
}
\cs_generate_variant:Nn \file_get:nnN { V }
\prg_new_protected_conditional:Npnn \file_get:nnN #1#2#3 { T , F , TF }
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{
\exp_args:NV \@@_get_aux:nnN
\l_@@_full_name_tl
{#2} #3
\prg_return_true:
}
{ \prg_return_false: }
}
\prg_generate_conditional_variant:Nnn \file_get:nnN { V } { T , F , TF }
\cs_new_protected:Npe \@@_get_aux:nnN #1#2#3
{
\exp_not:N \if_false: { \exp_not:N \fi:
\group_begin:
\int_set_eq:NN \tex_tracingnesting:D \c_zero_int
\exp_not:N \exp_args:No \tex_everyeof:D
{ \exp_not:N \c_@@_marker_tl }
#2 \scan_stop:
\exp_not:N \exp_after:wN \exp_not:N \@@_get_do:Nw
\exp_not:N \exp_after:wN #3
\exp_not:N \exp_after:wN \exp_not:N \prg_do_nothing:
\exp_not:N \tex_input:D
\sys_if_engine_luatex:TF
{ {#1} }
{ \exp_not:N \__kernel_file_name_quote:n {#1} \scan_stop: }
\exp_not:N \if_false: } \exp_not:N \fi:
}
\exp_args:Nno \use:nn
{ \cs_new_protected:Npn \@@_get_do:Nw #1#2 }
{ \c_@@_marker_tl }
{
\group_end:
\tl_set:No #1 {#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_size:n}
% A copy of the primitive where it's available.
% \begin{macrocode}
\cs_new_eq:NN \@@_size:n \tex_filesize:D
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\file_full_name:n, \@@_full_name:n, \@@_full_name_aux:n}
% \begin{macro}[EXP]{\@@_full_name_auxi:nn, \@@_full_name_auxii:nn}
% \begin{macro}[EXP]{\@@_full_name_aux:Nnn}
% \begin{macro}[EXP]{\@@_full_name_slash:n}
% \begin{macro}[EXP]{\@@_full_name_slash:w}
% \begin{macro}[EXP]{\@@_full_name_aux:nN}
% \begin{macro}[EXP]{\@@_full_name_aux:nnN}
% \begin{macro}[EXP]{\@@_name_cleanup:w}
% \begin{macro}[EXP]{\@@_name_end:}
% \begin{macro}[EXP]{\@@_name_ext_check:nn}
% \begin{macro}[EXP]{\@@_name_ext_check:nnw}
% \begin{macro}[EXP]{\@@_name_ext_check:nnnw}
% \begin{macro}[EXP]{\@@_name_ext_check:nnn}
% \begin{macro}[EXP]{\@@_name_ext_check:nnnn}
% File searching can be carried out if the \tn{pdffilesize} primitive
% or an equivalent is available. That of course means we need to
% arrange for everything else to here to be done by expansion too.
% We start off by sanitizing the name and quoting if required: we
% may need to remove those quotes, so the raw name is passed too.
% \begin{macrocode}
\cs_new:Npn \file_full_name:n #1
{
\exp_args:Ne \@@_full_name:n
{ \__kernel_file_name_sanitize:n {#1} }
}
\cs_generate_variant:Nn \file_full_name:n { V }
% \end{macrocode}
% First, we check of the file is just here: no mapping so we do not
% need the break part of the broader auxiliary. We are using the fact
% that the primitive here returns nothing if the file is entirely absent.
% To avoid unnecessary filesystem lookups, the result of \tn{pdffilesize}
% is kept available as an argument.
% For package mode, \tn{input@path} is a token list not a sequence.
% \begin{macrocode}
\cs_new:Npn \@@_full_name:n #1
{
\tl_if_blank:nF {#1}
{ \exp_args:Nne \@@_full_name_auxii:nn {#1} { \@@_full_name_aux:n {#1} } }
}
% \end{macrocode}
% To avoid repeated reading of files we need to cache the loading:
% this is important as the code here is used by \emph{all} file checks.
% The same marker is used in the \LaTeXe{} kernel, meaning that we get a
% double-saving with for example \cs{IfFileExists}. As this is all about
% performance, we use the low-level approach for the conditionals. For
% a file already seen, the size is reported as $-1$ so it's distinct from
% any non-cached ones.
% \begin{macrocode}
\cs_new:Npn \@@_full_name_aux:n #1
{
\if_cs_exist:w @@_seen_ \tl_to_str:n {#1} : \cs_end:
-1
\else:
\exp_args:Ne \@@_full_name_auxi:nn { \@@_size:n {#1} } {#1}
\fi:
}
% \end{macrocode}
% We will need the size of files later, and we have to avoid the
% \cs{scan_stop:} causing issues if we are raising the flag. Thus there is
% a slightly odd gobble here.
% \begin{macrocode}
\cs_new:Npn \@@_full_name_auxi:nn #1#2
{
\if:w \scan_stop: #1 \scan_stop:
\else:
\exp_after:wN \use_none:n
\cs:w @@_seen_ \tl_to_str:n {#2} : \cs_end:
#1
\fi:
}
\cs_new:Npn \@@_full_name_auxii:nn #1 #2
{
\tl_if_blank:nTF {#2}
{
\seq_map_tokens:Nn \l_file_search_path_seq
{ \@@_full_name_aux:Nnn \seq_map_break:n {#1} }
\cs_if_exist:NT \input@path
{
\tl_map_tokens:Nn \input@path
{ \@@_full_name_aux:Nnn \tl_map_break:n {#1} }
}
\@@_name_end:
}
{ \@@_ext_check:nn {#1} {#2} }
}
% \end{macrocode}
% Two pars to the auxiliary here so we can avoid doing quoting
% twice in the event we find the right file.
% \begin{macrocode}
\cs_new:Npn \@@_full_name_aux:Nnn #1#2#3
{
\exp_args:Ne \@@_full_name_aux:nN
{ \@@_full_name_slash:n {#3} #2 }
#1
}
\cs_new:Npn \@@_full_name_slash:n #1
{
\@@_full_name_slash:nw {#1} #1 \q_nil / \q_nil / \q_nil \q_stop
}
\cs_new:Npn \@@_full_name_slash:nw #1#2 / \q_nil / #3 \q_stop
{
\quark_if_nil:nTF {#3}
{ #1 / }
{ #2 / }
}
\cs_new:Npn \@@_full_name_aux:nN #1
{ \exp_args:Nne \@@_full_name_aux:nnN {#1} { \@@_full_name_aux:n {#1} } }
\cs_new:Npn \@@_full_name_aux:nnN #1 #2 #3
{
\tl_if_blank:nF {#2}
{
#3
{
\@@_ext_check:nn {#1} {#2}
\@@_name_cleanup:w
}
}
}
\cs_new:Npn \@@_name_cleanup:w #1 \@@_name_end: { }
\cs_new:Npn \@@_name_end: { }
% \end{macrocode}
% As \TeX{} automatically adds |.tex| if there is no extension,
% there is a little clean up to do here. First, make sure we are not in the
% directory part, saving that. Then check for an extension.
% \begin{macrocode}
\cs_new:Npn \@@_ext_check:nn #1 #2
{ \@@_ext_check:nnw {#2} { / } #1 / \q_@@_nil / \s_@@_stop }
\cs_new:Npn \@@_ext_check:nnw #1 #2 #3 / #4 / #5 \s_@@_stop
{
\@@_quark_if_nil:nTF {#4}
{
\exp_args:No \@@_ext_check:nnnw
{ \use_none:n #2 } {#1} {#3} #3 . \q_@@_nil . \s_@@_stop
}
{ \@@_ext_check:nnw {#1} { #2 #3 / } #4 / #5 \s_@@_stop }
}
\cs_new:Npe \@@_ext_check:nnnw #1#2#3#4 . #5 . #6 \s_@@_stop
{
\exp_not:N \@@_quark_if_nil:nTF {#5}
{
\exp_not:N \@@_ext_check:nnn
{ #1 #3 \tl_to_str:n { .tex } } { #1 #3 } {#2}
}
{ #1 #3 }
}
\cs_new:Npn \@@_ext_check:nnn #1
{ \exp_args:Nne \@@_ext_check:nnnn {#1} { \@@_full_name_aux:n {#1} } }
\cs_new:Npn \@@_ext_check:nnnn #1#2#3#4
{
\tl_if_blank:nTF {#2}
{#3}
{
\bool_lazy_or:nnTF
{ \int_compare_p:nNn {#4} = {#2} }
{ \int_compare_p:nNn {#2} = { -1 } }
{#1}
{#3}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_get_full_name:nN, \file_get_full_name:VN}
% \begin{macro}[TF]{\file_get_full_name:nN, \file_get_full_name:VN}
% \begin{macro}{\@@_get_full_name_search:nN}
% These functions pre-date using \cs{tex_filesize:D} for file searching,
% so are |get| functions with protection. To avoid having different
% search set ups, they are simply wrappers around the code above.
% \begin{macrocode}
\cs_new_protected:Npn \file_get_full_name:nN #1#2
{
\file_get_full_name:nNF {#1} #2
{ \tl_set:Nn #2 { \q_no_value } }
}
\cs_generate_variant:Nn \file_get_full_name:nN { V }
\prg_new_protected_conditional:Npnn \file_get_full_name:nN #1#2 { T , F , TF }
{
\__kernel_tl_set:Ne #2
{ \file_full_name:n {#1} }
\tl_if_empty:NTF #2
{ \prg_return_false: }
{ \prg_return_true: }
}
\prg_generate_conditional_variant:Nnn \file_get_full_name:nN
{ V } { T , F , TF }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\g_@@_internal_ior}
% A reserved stream to test for opening a shell.
% \begin{macrocode}
\ior_new:N \g_@@_internal_ior
% \end{macrocode}
% \end{variable}
%
% \begin{macro}[rEXP]
% {
% \file_mdfive_hash:n, \file_mdfive_hash:V,
% \file_size:n, \file_size:V,
% \file_timestamp:n, \file_timestamp:V
% }
% \begin{macro}[rEXP]{\@@_details:nn, \@@_details_aux:nn}
% \begin{macro}[rEXP]{\@@_mdfive_hash:n}
% Getting file details by expansion is relatively easy if a bit repetitive.
% As the MD5 function has a slightly different syntax from the other commands,
% there is a little cleaning up to do.
% \begin{macrocode}
\cs_new:Npn \file_size:n #1
{ \@@_details:nn {#1} { size } }
\cs_generate_variant:Nn \file_size:n { V }
\cs_new:Npn \file_timestamp:n #1
{ \@@_details:nn {#1} { moddate } }
\cs_generate_variant:Nn \file_timestamp:n { V }
\cs_new:Npn \@@_details:nn #1#2
{
\exp_args:Ne \@@_details_aux:nn
{ \file_full_name:n {#1} } {#2}
}
\cs_new:Npn \@@_details_aux:nn #1#2
{
\tl_if_blank:nF {#1}
{ \use:c { tex_file #2 :D } {#1} }
}
\cs_new:Npn \file_mdfive_hash:n #1
{ \exp_args:Ne \@@_mdfive_hash:n { \file_full_name:n {#1} } }
\cs_generate_variant:Nn \file_mdfive_hash:n { V }
\cs_new:Npn \@@_mdfive_hash:n #1
{ \tex_mdfivesum:D file {#1} }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[rEXP]{\file_hex_dump:nnn, \file_hex_dump:Vnn, \@@_hex_dump_auxi:nnn}
% \begin{macro}[rEXP]{\@@_hex_dump_auxii:nnnn, \@@_hex_dump_auxiii:nnnn}
% \begin{macro}[rEXP]{\@@_hex_dump_auxiiv:nnn}
% \begin{macro}[rEXP]{\file_hex_dump:n, \file_hex_dump:V, \@@_hex_dump:n}
% These are separate as they need multiple arguments \emph{or} the
% file size. For \LuaTeX{}, the emulation does not need the file
% size so we save a little on expansion.
% \begin{macrocode}
\cs_new:Npn \file_hex_dump:nnn #1#2#3
{
\exp_args:Neee \@@_hex_dump_auxi:nnn
{ \file_full_name:n {#1} }
{ \int_eval:n {#2} }
{ \int_eval:n {#3} }
}
\cs_generate_variant:Nn \file_hex_dump:nnn { V }
\cs_new:Npn \@@_hex_dump_auxi:nnn #1#2#3
{
\bool_lazy_any:nF
{
{ \tl_if_blank_p:n {#1} }
{ \int_compare_p:nNn {#2} = 0 }
{ \int_compare_p:nNn {#3} = 0 }
}
{
\exp_args:Ne \@@_hex_dump_auxii:nnnn
{ \@@_details_aux:nn {#1} { size } }
{#1} {#2} {#3}
}
}
\cs_new:Npn \@@_hex_dump_auxii:nnnn #1#2#3#4
{
\int_compare:nNnTF {#3} > 0
{ \@@_hex_dump_auxiii:nnnn {#3} }
{
\exp_args:Ne \@@_hex_dump_auxiii:nnnn
{ \int_eval:n { #1 + #3 } }
}
{#1} {#2} {#4}
}
\cs_new:Npn \@@_hex_dump_auxiii:nnnn #1#2#3#4
{
\int_compare:nNnTF {#4} > 0
{ \@@_hex_dump_auxiv:nnn {#4} }
{
\exp_args:Ne \@@_hex_dump_auxiv:nnn
{ \int_eval:n { #2 + #4 } }
}
{#1} {#3}
}
\cs_new:Npn \@@_hex_dump_auxiv:nnn #1#2#3
{
\tex_filedump:D
offset ~ \int_eval:n { #2 - 1 } ~
length ~ \int_eval:n { #1 - #2 + 1 }
{#3}
}
\cs_new:Npn \file_hex_dump:n #1
{ \exp_args:Ne \@@_hex_dump:n { \file_full_name:n {#1} } }
\cs_generate_variant:Nn \file_hex_dump:n { V }
\sys_if_engine_luatex:TF
{
\cs_new:Npn \@@_hex_dump:n #1
{
\tl_if_blank:nF {#1}
{ \tex_filedump:D whole {#1} {#1} }
}
}
{
\cs_new:Npn \@@_hex_dump:n #1
{
\tl_if_blank:nF {#1}
{ \tex_filedump:D length \tex_filesize:D {#1} {#1} }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[noTF]
% {
% \file_get_hex_dump:nN, \file_get_hex_dump:VN,
% \file_get_mdfive_hash:nN, \file_get_mdfive_hash:VN,
% \file_get_size:nN, \file_get_size:VN,
% \file_get_timestamp:nN, \file_get_timestamp:VN
% }
% \begin{macro}{\@@_get_details:nnN}
% Non-expandable wrappers around the above in the case where appropriate
% primitive support exists.
% \begin{macrocode}
\cs_new_protected:Npn \file_get_hex_dump:nN #1#2
{ \file_get_hex_dump:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_generate_variant:Nn \file_get_hex_dump:nN { V }
\cs_new_protected:Npn \file_get_mdfive_hash:nN #1#2
{ \file_get_mdfive_hash:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_generate_variant:Nn \file_get_mdfive_hash:nN { V }
\cs_new_protected:Npn \file_get_size:nN #1#2
{ \file_get_size:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_generate_variant:Nn \file_get_size:nN { V }
\cs_new_protected:Npn \file_get_timestamp:nN #1#2
{ \file_get_timestamp:nNF {#1} #2 { \tl_set:Nn #2 { \q_no_value } } }
\cs_generate_variant:Nn \file_get_timestamp:nN { V }
\prg_new_protected_conditional:Npnn \file_get_hex_dump:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { hex_dump } #2 }
\prg_generate_conditional_variant:Nnn \file_get_hex_dump:nN
{ V } { T , F , TF }
\prg_new_protected_conditional:Npnn \file_get_mdfive_hash:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { mdfive_hash } #2 }
\prg_generate_conditional_variant:Nnn \file_get_mdfive_hash:nN
{ V } { T , F , TF }
\prg_new_protected_conditional:Npnn \file_get_size:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { size } #2 }
\prg_generate_conditional_variant:Nnn \file_get_size:nN
{ V } { T , F , TF }
\prg_new_protected_conditional:Npnn \file_get_timestamp:nN #1#2 { T , F , TF }
{ \@@_get_details:nnN {#1} { timestamp } #2 }
\prg_generate_conditional_variant:Nnn \file_get_timestamp:nN
{ V } { T , F , TF }
\cs_new_protected:Npn \@@_get_details:nnN #1#2#3
{
\__kernel_tl_set:Ne #3
{ \use:c { file_ #2 :n } {#1} }
\tl_if_empty:NTF #3
{ \prg_return_false: }
{ \prg_return_true: }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[noTF]{\file_get_hex_dump:nnnN, \file_get_hex_dump:VnnN}
% Custom code due to the additional arguments.
% \begin{macrocode}
\cs_new_protected:Npn \file_get_hex_dump:nnnN #1#2#3#4
{
\file_get_hex_dump:nnnNF {#1} {#2} {#3} #4
{ \tl_set:Nn #4 { \q_no_value } }
}
\cs_generate_variant:Nn \file_get_hex_dump:nnnN { V }
\prg_new_protected_conditional:Npnn \file_get_hex_dump:nnnN #1#2#3#4
{ T , F , TF }
{
\__kernel_tl_set:Ne #4
{ \file_hex_dump:nnn {#1} {#2} {#3} }
\tl_if_empty:NTF #4
{ \prg_return_false: }
{ \prg_return_true: }
}
\prg_generate_conditional_variant:Nnn \file_get_hex_dump:nnnN
{ V } { T , F , TF }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_str_cmp:nn}
% As we are doing a fixed-length \enquote{big} integer comparison, it
% is easiest to use the low-level behavior of string comparisons.
% \begin{macrocode}
\cs_new_eq:NN \@@_str_cmp:nn \tex_strcmp:D
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP, pTF]
% {
% \file_compare_timestamp:nNn,
% \file_compare_timestamp:nNV,
% \file_compare_timestamp:VNn
% \file_compare_timestamp:VNV
% }
% \begin{macro}[EXP]{\@@_compare_timestamp:nnN}
% \begin{macro}[EXP]{\@@_timestamp:n}
% Comparison of file date can be done by using the low-level nature of the
% string comparison functions.
% \begin{macrocode}
\prg_new_conditional:Npnn \file_compare_timestamp:nNn #1#2#3
{ p , T , F , TF }
{
\exp_args:Nee \@@_compare_timestamp:nnN
{ \file_full_name:n {#1} }
{ \file_full_name:n {#3} }
#2
}
\prg_generate_conditional_variant:Nnn \file_compare_timestamp:nNn
{ nNV , V , VNV } { p , T , F , TF }
\cs_new:Npn \@@_compare_timestamp:nnN #1#2#3
{
\tl_if_blank:nTF {#1}
{
\if_charcode:w #3 <
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
{
\tl_if_blank:nTF {#2}
{
\if_charcode:w #3 >
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
{
\if_int_compare:w
\@@_str_cmp:nn
{ \@@_timestamp:n {#1} }
{ \@@_timestamp:n {#2} }
#3 \c_zero_int
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
}
}
\cs_new_eq:NN \@@_timestamp:n \tex_filemoddate:D
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}[TF]{\file_if_exist:n, \file_if_exist:V}
% 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 contains
% something, whereas if the file was not located then the return value
% is empty.
% \begin{macrocode}
\prg_new_conditional:Npnn \file_if_exist:n #1 { p , T , F , TF }
{
\tl_if_blank:eTF { \file_full_name:n {#1} }
{ \prg_return_false: }
{ \prg_return_true: }
}
\prg_generate_conditional_variant:Nnn \file_if_exist:n { V } { p , T , F , TF }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}
% {
% \file_if_exist_input:n,
% \file_if_exist_input:V,
% \file_if_exist_input:nF,
% \file_if_exist_input:VF
% }
% Input of a file with a test for existence. We do not define the |T|
% or |TF| variants because the most useful place to place the
% \meta{true code} would be inconsistent with other conditionals.
% \begin{macrocode}
\cs_new_protected:Npn \file_if_exist_input:n #1
{
\file_get_full_name:nNT {#1} \l_@@_full_name_tl
{ \@@_input:V \l_@@_full_name_tl }
}
\cs_generate_variant:Nn \file_if_exist_input:n { V }
\cs_new_protected:Npn \file_if_exist_input:nF #1#2
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{ \@@_input:V \l_@@_full_name_tl }
{#2}
}
\cs_generate_variant:Nn \file_if_exist_input:nF { V }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_input_stop:}
% A simple rename.
% \begin{macrocode}
\cs_new_protected:Npn \file_input_stop: { \tex_endinput:D }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\__kernel_file_missing:n}
% An error message for a missing file, also used in \cs{ior_open:Nn}.
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_file_missing:n #1
{
\msg_error:nne { kernel } { file-not-found }
{ \__kernel_file_name_sanitize:n {#1} }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_input:n, \file_input:V}
% \begin{macro}{\@@_input:n, \@@_input:V}
% \begin{macro}{\@@_input_push:n, \__kernel_file_input_push:n}
% \begin{macro}{\@@_input_pop:, \__kernel_file_input_pop:}
% \begin{macro}{\@@_input_pop:nnn}
% 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
{
\file_get_full_name:nNTF {#1} \l_@@_full_name_tl
{ \@@_input:V \l_@@_full_name_tl }
{ \__kernel_file_missing:n {#1} }
}
\cs_generate_variant:Nn \file_input:n { V }
\cs_new_protected:Npe \@@_input:n #1
{
\exp_not:N \clist_if_exist:NTF \exp_not:N \@filelist
{ \exp_not:N \@addtofilelist {#1} }
{ \seq_gput_right:Nn \exp_not:N \g_@@_record_seq {#1} }
\exp_not:N \@@_input_push:n {#1}
\exp_not:N \tex_input:D
\sys_if_engine_luatex:TF
{ {#1} }
{ \exp_not:N \__kernel_file_name_quote:n {#1} \scan_stop: }
\exp_not:N \@@_input_pop:
}
\cs_generate_variant:Nn \@@_input:n { V }
% \end{macrocode}
% Keeping a track of the file data is easy enough: we store the separated
% parts so we do not need to parse them twice.
% \begin{macrocode}
\cs_new_protected:Npn \@@_input_push:n #1
{
\seq_gpush:Ne \g_@@_stack_seq
{
{ \g_file_curr_dir_str }
{ \g_file_curr_name_str }
{ \g_file_curr_ext_str }
}
\file_parse_full_name:nNNN {#1}
\l_@@_dir_str \l_@@_name_str \l_@@_ext_str
\str_gset_eq:NN \g_file_curr_dir_str \l_@@_dir_str
\str_gset_eq:NN \g_file_curr_name_str \l_@@_name_str
\str_gset_eq:NN \g_file_curr_ext_str \l_@@_ext_str
}
\cs_new_eq:NN \__kernel_file_input_push:n \@@_input_push:n
\cs_new_protected:Npn \@@_input_pop:
{
\seq_gpop:NN \g_@@_stack_seq \l_@@_internal_tl
\exp_after:wN \@@_input_pop:nnn \l_@@_internal_tl
}
\cs_new_eq:NN \__kernel_file_input_pop: \@@_input_pop:
\cs_new_protected:Npn \@@_input_pop:nnn #1#2#3
{
\str_gset:Nn \g_file_curr_dir_str {#1}
\str_gset:Nn \g_file_curr_name_str {#2}
\str_gset:Nn \g_file_curr_ext_str {#3}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_input_raw:n, \file_input_raw:V, \@@_input_raw:nn}
% No error checking, no tracking.
% \begin{macrocode}
\cs_new:Npn \file_input_raw:n #1
{ \exp_args:Ne \@@_input_raw:nn { \file_full_name:n {#1} } {#1} }
\cs_generate_variant:Nn \file_input_raw:n { V }
\cs_new:Npe \@@_input_raw:nn #1#2
{
\exp_not:N \tl_if_blank:nTF {#1}
{
\exp_not:N \exp_args:Nnne \exp_not:N \msg_expandable_error:nnn
{ kernel } { file-not-found }
{ \exp_not:N \__kernel_file_name_sanitize:n {#2} }
}
{
\exp_not:N \tex_input:D
\sys_if_engine_luatex:TF
{ {#1} }
{ \exp_not:N \__kernel_file_name_quote:n {#1} \scan_stop: }
}
}
\exp_args_generate:n { nne }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_parse_full_name:n, \file_parse_full_name:nV}
% \begin{macro}{\file_parse_full_name_apply:nN \file_parse_full_name_apply:VN}
% The main parsing macro \cs{file_parse_full_name_apply:nN} passes the
% file name |#1| through \cs{__kernel_file_name_sanitize:n} so that we
% have a single normalised way to treat files internally.
% \cs{file_parse_full_name:n} uses the former, with
% \cs{prg_do_nothing:} to
% leave each part of the name within a pair of braces.
% \begin{macrocode}
\cs_new:Npn \file_parse_full_name:n #1
{
\file_parse_full_name_apply:nN {#1}
\prg_do_nothing:
}
\cs_generate_variant:Nn \file_parse_full_name:n { V }
\cs_new:Npn \file_parse_full_name_apply:nN #1
{
\exp_args:Ne \@@_parse_full_name_auxi:nN
{ \__kernel_file_name_sanitize:n {#1} }
}
\cs_generate_variant:Nn \file_parse_full_name_apply:nN { V }
% \end{macrocode}
%
% \begin{macro}{\@@_parse_full_name_auxi:nN}
% \begin{macro}{\@@_parse_full_name_area:nw}
% \cs{@@_parse_full_name_area:nw} splits the file name into chunks
% separated by |/|, until the last one is reached. The last chunk is
% the file name plus the extension, and everything before that is the
% path. When \cs{@@_parse_full_name_area:nw} is done, it leaves
% the path within braces after the scan mark \cs{s_@@_stop} and
% proceeds parsing the actual file name.
% \begin{macrocode}
\cs_new:Npn \@@_parse_full_name_auxi:nN #1
{
\@@_parse_full_name_area:nw { } #1
/ \s_@@_stop
}
\cs_new:Npn \@@_parse_full_name_area:nw #1 #2 / #3 \s_@@_stop
{
\tl_if_empty:nTF {#3}
{ \@@_parse_full_name_base:nw { } #2 . \s_@@_stop {#1} }
{ \@@_parse_full_name_area:nw { #1 / #2 } #3 \s_@@_stop }
}
% \end{macrocode}
%
% \begin{macro}{\@@_parse_full_name_base:nw}
% \cs{@@_parse_full_name_base:nw} does roughly the same as above, but
% it separates the chunks at each period. However here there's some
% extra complications: In case |#1| is empty, it is assumed that the
% extension is actually empty, and the file name is |#2|. Besides, an
% extra |.| has to be added to |#2| because it is later removed in
% \cs{@@_parse_full_name_tidy:nnnN}. In any case, if there's an
% extension, it is returned with a leading |.|.
% \begin{macrocode}
\cs_new:Npn \@@_parse_full_name_base:nw #1 #2 . #3 \s_@@_stop
{
\tl_if_empty:nTF {#3}
{
\tl_if_empty:nTF {#1}
{
\tl_if_empty:nTF {#2}
{ \@@_parse_full_name_tidy:nnnN { } { } }
{ \@@_parse_full_name_tidy:nnnN { .#2 } { } }
}
{ \@@_parse_full_name_tidy:nnnN {#1} { .#2 } }
}
{ \@@_parse_full_name_base:nw { #1 . #2 } #3 \s_@@_stop }
}
% \end{macrocode}
%
% \begin{macro}{\@@_parse_full_name_tidy:nnnN}
% Now we just need to tidy some bits left loose before. The loop
% used in the two macros above start with a leading |/| and |.| in the
% file path an name, so here we need to remove them, except in the
% path, if it is a single |/|, in which case it's left as is. After
% all's done, pass to |#4|.
% \begin{macrocode}
\cs_new:Npn \@@_parse_full_name_tidy:nnnN #1 #2 #3 #4
{
\exp_args:Nee #4
{
\str_if_eq:nnF {#3} { / } { \use_none:n }
#3 \prg_do_nothing:
}
{ \use_none:n #1 \prg_do_nothing: }
{#2}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\file_parse_full_name:nNNN, \file_parse_full_name:VNNN}
% \begin{macrocode}
\cs_new_protected:Npn \file_parse_full_name:nNNN #1 #2 #3 #4
{
\file_parse_full_name_apply:nN {#1}
\@@_full_name_assign:nnnNNN #2 #3 #4
}
\cs_new_protected:Npn \@@_full_name_assign:nnnNNN #1 #2 #3 #4 #5 #6
{
\str_set:Nn #4 {#1}
\str_set:Nn #5 {#2}
\str_set:Nn #6 {#3}
}
\cs_generate_variant:Nn \file_parse_full_name:nNNN { V }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\file_show_list:, \file_log_list:, \@@_list:N}
% \begin{macro}[EXP]{\@@_list_aux:n}
% 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
% this list of file names into account (we capture it
% \cs{AtBeginDocument} into \cs{g_@@_record_seq}), turning it to a
% string (this does not affect the commas of this comma list).
% \begin{macrocode}
\cs_new_protected:Npn \file_show_list: { \@@_list:N \msg_show:nneeee }
\cs_new_protected:Npn \file_log_list: { \@@_list:N \msg_log:nneeee }
\cs_new_protected:Npn \@@_list:N #1
{
\seq_clear:N \l_@@_tmp_seq
\clist_if_exist:NT \@filelist
{
\exp_args:NNe \seq_set_from_clist:Nn \l_@@_tmp_seq
{ \tl_to_str:N \@filelist }
}
\seq_concat:NNN \l_@@_tmp_seq \l_@@_tmp_seq \g_@@_record_seq
\seq_remove_duplicates:N \l_@@_tmp_seq
#1 { kernel } { file-list }
{ \seq_map_function:NN \l_@@_tmp_seq \@@_list_aux:n }
{ } { } { }
}
\cs_new:Npn \@@_list_aux:n #1 { \iow_newline: #1 }
% \end{macrocode}
% \end{macro}
% \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}
\cs_if_exist:NT \@filelist
{
\AtBeginDocument
{
\exp_args:NNe \seq_set_from_clist:Nn \l_@@_tmp_seq
{ \tl_to_str:N \@filelist }
\seq_gconcat:NNN
\g_@@_record_seq
\g_@@_record_seq
\l_@@_tmp_seq
}
}
% \end{macrocode}
%
% \subsection{GetIdInfo}
%
% \begin{macro}{\GetIdInfo}
% \begin{macro}{\@@_id_info_auxi:w, \@@_id_info_auxii:w, \@@_id_info_auxiii:w}
% As documented in \pkg{expl3.dtx} this function extracts file name
% etc from an \textsc{svn} \texttt{Id} line. This used to be how we
% got version number and so on in all modules, so it had to be defined
% in \pkg{l3bootstrap}. Now it's more convenient to define it after
% we have set up quite a lot of tools, and \pkg{l3file} seems the
% least unreasonable place for it.
%
% The idea here is to extract out the information needed from a standard
% \textsc{svn} \texttt{Id} line, but to avoid a line that would get
% changed when the file is checked in. Hence the fact that none of the
% lines here include both a dollar sign and the \texttt{Id} keyword!
% \begin{macrocode}
\cs_new_protected:Npn \GetIdInfo
{
\tl_clear_new:N \ExplFileDescription
\tl_clear_new:N \ExplFileDate
\tl_clear_new:N \ExplFileName
\tl_clear_new:N \ExplFileExtension
\tl_clear_new:N \ExplFileVersion
\group_begin:
\char_set_catcode_space:n { 32 }
\exp_after:wN
\group_end:
\@@_id_info_auxi:w
}
% \end{macrocode}
% A first check for a completely empty \textsc{svn} field. If that is
% not the case, there is a second case when a file created using
% \texttt{svn cp} but has not been checked in. That leaves a special
% marker \texttt{-1} version, which has no further data. Dealing
% correctly with that is the reason for the space in the line to use
% \cs{@@_id_info_auxii:w}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_id_info_auxi:w $ #1 $ #2
{
\tl_set:Nn \ExplFileDescription {#2}
\str_if_eq:nnTF {#1} { Id }
{
\tl_set:Nn \ExplFileDate { 0000/00/00 }
\tl_set:Nn \ExplFileName { [unknown] }
\tl_set:Nn \ExplFileExtension { [unknown~extension] }
\tl_set:Nn \ExplFileVersion {-1}
}
{ \@@_id_info_auxii:w #1 ~ \s_@@_stop }
}
% \end{macrocode}
% Here, |#1| is |Id|, |#2| is the file name, |#3| is the extension,
% |#4| is the version, |#5| is the check in date and |#6| is the check
% in time and user, plus some trailing spaces. If |#4| is the marker
% |-1| value then |#5| and |#6| are empty.
% \begin{macrocode}
\cs_new_protected:Npn \@@_id_info_auxii:w
#1 ~ #2.#3 ~ #4 ~ #5 ~ #6 \s_@@_stop
{
\tl_set:Nn \ExplFileName {#2}
\tl_set:Nn \ExplFileExtension {#3}
\tl_set:Nn \ExplFileVersion {#4}
\str_if_eq:nnTF {#4} {-1}
{ \tl_set:Nn \ExplFileDate { 0000/00/00 } }
{ \@@_id_info_auxiii:w #5 - 0 - 0 - \s_@@_stop }
}
% \end{macrocode}
% Convert an \textsc{svn}-style date into a \LaTeX{}-style one.
% \begin{macrocode}
\cs_new_protected:Npn \@@_id_info_auxiii:w #1 - #2 - #3 - #4 \s_@@_stop
{ \tl_set:Nn \ExplFileDate { #1/#2/#3 } }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Checking the version of kernel dependencies}
%
% \begin{macro}{\__kernel_dependency_version_check:Nn}
% \begin{macro}{\__kernel_dependency_version_check:nn}
% \begin{macro}{\@@_kernel_dependency_compare:nnn,\@@_parse_version:w}
% This function is responsible for checking if dependencies of the
% \LaTeX3 kernel match the version preloaded in the \LaTeXe{} kernel.
% If versions don't match, the function attempts to tell why by
% searching for a possible stray format file.
%
% The function starts by checking that the kernel date is defined, and
% if not zero is used to force the error route. The kernel date is
% then compared with the argument requested date (ususally the
% packaging date of the dependency). If the kernel date is less than
% the required date, it's an error and the loading should abort.
% \begin{macrocode}
\cs_new_protected:Npn \__kernel_dependency_version_check:Nn #1
{ \exp_args:NV \__kernel_dependency_version_check:nn #1 }
\cs_new_protected:Npn \__kernel_dependency_version_check:nn #1
{
\cs_if_exist:NTF \c__kernel_expl_date_tl
{
\exp_args:NV \@@_kernel_dependency_compare:nnn
\c__kernel_expl_date_tl {#1}
}
{ \@@_kernel_dependency_compare:nnn { 0000-00-00 } {#1} }
}
\cs_new_protected:Npn \@@_kernel_dependency_compare:nnn #1 #2 #3
{
\int_compare:nNnT
{ \@@_parse_version:w #1 \s_@@_stop } <
{ \@@_parse_version:w #2 \s_@@_stop }
{ \@@_mismatched_dependency_error:nn {#2} {#3} }
}
\cs_new:Npn \@@_parse_version:w #1 - #2 - #3 \s_@@_stop {#1#2#3}
% \end{macrocode}
%
% \begin{macro}{\@@_mismatched_dependency_error:nn}
% If the versions differ, then we try to give the user some guidance.
% This function starts by taking the engine name \cs{c_sys_engine_str}
% and replacing |tex| by |latex|, then building a command of the form:
% \begin{texttt}
% kpsewhich --all --engine=\meta{engine} \meta{format}[-dev].fmt
% \end{texttt}
% to query the format files available. A shell is opened and each
% line is read into a sequence.
% \begin{macrocode}
\cs_new_protected:Npn \@@_mismatched_dependency_error:nn #1 #2
{
\exp_args:NNe \ior_shell_open:Nn \g_@@_internal_ior
{
kpsewhich ~ --all ~
--engine = \c_sys_engine_exec_str
\c_space_tl \c_sys_engine_format_str
\bool_lazy_and:nnT
{ \tl_if_exist_p:N \development@branch@name }
{ ! \tl_if_empty_p:N \development@branch@name }
{ -dev } .fmt
}
\seq_clear:N \l_@@_tmp_seq
\ior_map_inline:Nn \g_@@_internal_ior
{ \seq_put_right:Nn \l_@@_tmp_seq {##1} }
\ior_close:N \g_@@_internal_ior
\msg_error:nnnn { kernel } { mismatched-support-file }
{#1} {#2}
% \end{macrocode}
% And finish by ending the current file.
% \begin{macrocode}
\tex_endinput:D
}
% \end{macrocode}
%
% Now define the actual error message:
% \begin{macrocode}
\msg_new:nnnn { kernel } { mismatched-support-file }
{
Mismatched~LaTeX~support~files~detected. \\
Loading~'#2'~aborted!
% \end{macrocode}
% \cs{c__kernel_expl_date_tl} may not exist, due to an older format,
% so only print the dates when the sentinel token list exists:
% \begin{macrocode}
\tl_if_exist:NT \c__kernel_expl_date_tl
{
\\ \\
The~L3~programming~layer~in~the~LaTeX~format \\
is~dated~\c__kernel_expl_date_tl,~but~in~your~TeX~
tree~the~files~require \\ at~least~#1.
}
}
{
% \end{macrocode}
% The sequence containing the format files should have exactly one
% item: the format file currently being run. If that's the case, the
% cause of the error is not that, so print a generic help with some
% possible causes. If more than one format file was found, then print
% the list to the user, with appropriate indications of what's in the
% system and what's in the user tree.
% \begin{macrocode}
\int_compare:nNnTF { \seq_count:N \l_@@_tmp_seq } > 1
{
The~cause~seems~to~be~an~old~format~file~in~the~user~tree. \\
LaTeX~found~these~files:
\seq_map_tokens:Nn \l_@@_tmp_seq { \\~-~\use:n } \\
Try~deleting~the~file~in~the~user~tree~then~run~LaTeX~again.
}
{
The~most~likely~causes~are:
\\~-~A~recent~format~generation~failed;
\\~-~A~stray~format~file~in~the~user~tree~which~needs~
to~be~removed~or~rebuilt;
\\~-~You~are~running~a~manually~installed~version~of~#2 \\
\ \ \ which~is~incompatible~with~the~version~in~LaTeX. \\
}
\\
LaTeX~will~abort~loading~the~incompatible~support~files~
but~this~may~lead~to \\ later~errors.~Please~ensure~that~
your~LaTeX~format~is~correctly~regenerated.
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Messages}
%
% \begin{macrocode}
\msg_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_new:nnn { kernel } { file-list }
{
>~File~List~<
#1 \\
.............
}
\msg_new:nnnn { kernel } { filename-chars-lost }
{ #1~invalid~in~file~name.~Lost:~#2. }
{
There~was~an~invalid~token~in~the~file~name~that~caused~
the~characters~following~it~to~be~lost.
}
\msg_new:nnnn { kernel } { filename-missing-endcsname }
{ Missing~\iow_char:N\\endcsname~inserted~in~filename. }
{
The~file~name~had~more~\iow_char:N\\csname~commands~than~
\iow_char:N\\endcsname~ones.~LaTeX~will~add~the~missing~
\iow_char:N\\endcsname~and~try~to~continue~as~best~as~it~can.
}
\msg_new:nnnn { kernel } { unbalanced-quote-in-filename }
{ Unbalanced~quotes~in~file~name~'#1'. }
{
File~names~must~contain~balanced~numbers~of~quotes~(").
}
\msg_new:nnnn { kernel } { iow-indent }
{ Only~#1 allows~#2 }
{
The~command~#2 can~only~be~used~in~messages~
which~will~be~wrapped~using~#1.
\tl_if_empty:nF {#3} { ~ It~was~called~with~argument~'#3'. }
}
% \end{macrocode}
%
% \subsection{Functions delayed from earlier modules}
%
%<@@=sys>
%
% \begin{variable}{\c_sys_platform_str}
% Detecting the platform on \LuaTeX{} is easy: for other engines, we use
% the fact that the two common cases have special null files. It is possible
% to probe further (see package \pkg{platform}), but that requires shell
% escape and seems unlikely to be useful. This is set up here as it requires
% file searching.
% \begin{macrocode}
\sys_if_engine_luatex:TF
{
\str_const:Ne \c_sys_platform_str
{ \tex_directlua:D { tex.print(os.type) } }
}
{
\file_if_exist:nTF { nul: }
{
\file_if_exist:nF { /dev/null }
{ \str_const:Nn \c_sys_platform_str { windows } }
}
{
\file_if_exist:nT { /dev/null }
{ \str_const:Nn \c_sys_platform_str { unix } }
}
}
\cs_if_exist:NF \c_sys_platform_str
{ \str_const:Nn \c_sys_platform_str { unknown } }
% \end{macrocode}
% \end{variable}
% \begin{macro}[pTF]{\sys_if_platform_unix:}
% \begin{macro}[pTF]{\sys_if_platform_windows:}
% We can now set up the tests.
% \begin{macrocode}
\clist_map_inline:nn { unix , windows }
{
\@@_const:nn { sys_if_platform_ #1 }
{ \str_if_eq_p:Vn \c_sys_platform_str { #1 } }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|