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|
% \iffalse meta-comment
%
%% File: l3io.dtx Copyright (C) 1990-2011 The LaTeX3 Project
%%
%% It may be distributed and/or modified under the conditions of the
%% LaTeX Project Public License (LPPL), either version 1.3c of this
%% license or (at your option) any later version. The latest version
%% of this license is in the file
%%
%% http://www.latex-project.org/lppl.txt
%%
%% This file is part of the "expl3 bundle" (The Work in LPPL)
%% and all files in that bundle must be distributed together.
%%
%% The released version of this bundle is available from CTAN.
%%
%% -----------------------------------------------------------------------
%%
%% The development version of the bundle can be found at
%%
%% http://www.latex-project.org/svnroot/experimental/trunk/
%%
%% for those people who are interested.
%%
%%%%%%%%%%%
%% NOTE: %%
%%%%%%%%%%%
%%
%% Snapshots taken from the repository represent work in progress and may
%% not work or may contain conflicting material! We therefore ask
%% people _not_ to put them into distributions, archives, etc. without
%% prior consultation with the LaTeX3 Project.
%%
%% -----------------------------------------------------------------------
%
%<*driver|package>
\RequirePackage{l3names}
\GetIdInfo$Id: l3io.dtx 2595 2011-08-16 00:58:34Z bruno $
{L3 Experimental input-output operations}
%</driver|package>
%<*driver>
\documentclass[full]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3io} package\\ Input--output operations^^A
% \thanks{This file describes v\ExplFileVersion,
% last revised \ExplFileDate.}^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released \ExplFileDate}
%
% \maketitle
%
% \begin{documentation}
%
% Reading and writing from file streams is handled in \LaTeX3 using
% functions with prefixes \cs{iow_\ldots} (file reading) and
% \cs{ior_\ldots} (file writing). Many of the basic functions are
% very similar, with reading and writing using the same syntax and
% function concepts. As a result, the reading and writing functions
% are documented together where this makes sense.
%
% As \TeX{} is limited to $16$ input streams and $16$ output
% streams, direct use of the streams by the programmer is not
% supported in \LaTeX3. Instead, an internal pool of streams is
% maintained, and these are allocated and deallocated as needed
% by other modules. As a result, the programmer should close streams
% when they are no longer needed, to release them for other processes.
%
% Reading from or writing to a file requires a \meta{stream} to
% be used. This is a csname which refers to the file being processed,
% and is independent of the name of the file (except of course that
% the file name is needed when the file is opened).
%
% \section{Opening and closing streams}
%
% \begin{function}{\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 file ends.
% \end{function}
%
% \begin{function}{\iow_open:Nn, \iow_open:cn}
% \begin{syntax}
% \cs{iow_open:Nn} \meta{stream} \Arg{file name}
% \end{syntax}
% Opens \meta{file name} for writing using \meta{stream} as the
% control sequence for file access. If the \meta{stream} was already
% open it is closed before the new operation begins. The
% \meta{stream} is available for access immediately and will remain
% allocated to \meta{file name} until a \cs{iow_close:N} instruction
% is given or the file ends. Opening a file for writing will clear
% any existing content in the file (\emph{i.e.}~writing is \emph{not}
% additive).
% \end{function}
%
% \begin{function}{\ior_close:N, \ior_close:c}
% \begin{syntax}
% \cs{ior_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 programmer. The name of the \meta{stream} will be freed at
% this stage, to ensure that any further attempts to read from it results
% in an error.
% \end{function}
%
% \begin{function}{\iow_close:N, \iow_close:c}
% \begin{syntax}
% \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 programmer. The name of the \meta{stream} will be freed at
% this stage, to ensure that any further attempts to write to it results
% in an error.
% \end{function}
%
% \begin{function}{\ior_list_streams:, \iow_list_streams:}
% \begin{syntax}
% \cs{ior_list_streams:} \\
% \cs{iow_list_streams:}
% \end{syntax}
% Displays a list of the file names associated with each open
% stream: intended for tracking down problems.
% \end{function}
%
% \section{Writing to files}
%
% \begin{function}{\iow_now:Nn, \iow_now:Nx}
% \begin{syntax}
% \cs{iow_now:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} immediately (\emph{i.e.}~the write operation is called
% on expansion of \cs{iow_now:Nn}).
% \begin{texnote}
% \cs{iow_now:Nx} is a protected macro which expands to
% the two \TeX{} primitives \cs{immediate}\cs{write}.
% \end{texnote}
% \end{function}
%
% \begin{function}{\iow_log:n, \iow_log:x}
% \begin{syntax}
% \cs{iow_log:n} \Arg{tokens}
% \end{syntax}
% This function writes the given \meta{tokens} to the log (transcript)
% file immediately: it is a dedicated version of \cs{iow_now:Nn}.
% \end{function}
%
% \begin{function}{\iow_term:n, \iow_term:x}
% \begin{syntax}
% \cs{iow_term:n} \Arg{tokens}
% \end{syntax}
% This function writes the given \meta{tokens} to the terminal
% file immediately: it is a dedicated version of \cs{iow_now:Nn}.
% \end{function}
%
% \begin{function}{\iow_now_when_avail:Nn, \iow_now_when_avail:Nx}
% \begin{syntax}
% \cs{iow_now_when_avail:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% If \meta{stream} is open, writes the \meta{tokens} to the \meta{stream}
% in the same manner as \cs{iow_now:Nn}. If the \meta{stream} is not open,
% the \meta{tokens}are simply thrown away.
% \end{function}
%
% \begin{function}{\iow_shipout:Nn, \iow_shipout:Nx}
% \begin{syntax}
% \cs{iow_shipout:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} when the current page is finalised (\emph{i.e.}~at
% shipout). The \texttt{x}-type variants expand the \meta{tokens}
% at the point where the function is used but \emph{not} when the
% resulting tokens are written to the \meta{stream}
% (\emph{cf.}~\cs{iow_shipout_x:Nn}).
% \end{function}
%
% \begin{function}{\iow_shipout_x:Nn, \iow_shipout_x:Nx}
% \begin{syntax}
% \cs{iow_shipout_x:Nn} \meta{stream} \Arg{tokens}
% \end{syntax}
% This functions writes \meta{tokens} to the specified
% \meta{stream} when the current page is finalised (\emph{i.e}.~at
% shipout). The \meta{tokens} are expanded at the time of writing
% in addition to any expansion when the function is used. This makes
% these functions suitable for including material finalised during
% the page building process (such as the page number integer).
% \begin{texnote}
% \cs{iow_shipout_x:Nn} is the \TeX{} primitive \cs{write} renamed.
% \end{texnote}
% \end{function}
%
% \begin{function}[EXP]{\iow_char:N}
% \begin{syntax}
% \cs{iow_char:N} \meta{token}
% \end{syntax}
% Inserts \meta{token} into the output stream. Useful when trying to
% write difficult characters such as "%", "{", "}",
% \emph{etc}.~in messages, for example:
% \begin{verbatim}
% \iow_now:Nx \g_my_stream { \iow_char:N \{ text \iow_char:N \} }
% \end{verbatim}
% The function has no effect if writing is taking place without
% expansion (\emph{e.g.}~in the second argument of \cs{iow_now:Nn}).
% \end{function}
%
% \begin{function}[EXP]{\iow_newline:}
% \begin{syntax}
% \cs{iow_newline:}
% \end{syntax}
% Function to add a new line within the \meta{tokens} written to a
% file. The function has no effect if writing is taking place without
% expansion (\emph{e.g.}~in the second argument of \cs{iow_now:Nn}).
% \end{function}
%
% \section{Wrapping lines in output}
%
% \begin{function}{\iow_wrap:xnnnN}
% \begin{syntax}
% \cs{iow_wrap:xnnnN} \Arg{text} \Arg{run-on text} \Arg{run-on length}
% ~~\Arg{set up} \meta{function}
% \end{syntax}
% This function will wrap the \meta{text} to a fixed number of
% characters per line. At the start of each line which is wrapped,
% the \meta{run-on text} will be inserted. The line length targeted
% will be the value of \cs{l_iow_line_length_int} minus the
% \meta{run-on length}. The later value should be the number of
% characters in the \meta{run-on text}. Additional functions may be
% added to the wrapping by using the \meta{set up}, which is executed
% before the wrapping takes place. The result of the wrapping operation
% is passed as a braced argument to the \meta{function}, which will
% typically be a wrapper around a writing operation. Within the
% \meta{text}, |\\| may be used to force a new line and \verb|\ | may be
% used to represent a forced space (for example after a control
% sequence). Both the wrapping process and the subsequent write operation
% will perform \texttt{x}-type expansion. For this reason, material which
% is to be written \enquote{as is} should be given as the argument to
% \cs{token_to_str:N} or \cs{tl_to_str:n} (as appropriate) within
% the \meta{text}. The output of \cs{iow_wrap:xnnnN} (\emph{i.e.}~the
% argument passed to the \meta{function}) will consist of characters of
% category code $12$ (other) and $10$ (space) only. This means that the
% output will \emph{not} expand further when written to a file.
% \end{function}
%
% \begin{variable}{\l_iow_line_length_int}
% The maximum length of a line to be written by the \cs{iow_wrap:xxnnN}
% function. This value depends on the \TeX{} system in use: the standard
% value is $78$, which is typically correct for unmodified \TeX{}live
% and MiK\TeX{} systems.
% \end{variable}
%
% \section{Reading from files}
%
% \begin{function}{\ior_to:NN}
% \begin{syntax}
% \cs{ior_to:NN} \meta{stream} \meta{token list variable}
% \end{syntax}
% Functions that reads one or more lines (until an equal number of left
% and right braces are found) from the input \meta{stream} and stores
% the result locally in the \meta{token list} variable. If the
% \meta{stream} is not open, input is requested from the terminal.
% The material read from the \meta{stream} will be tokenized by
% \TeX{} according to the category codes in force when the function
% is used.
% \begin{texnote}
% The is protected macro which expands to the \TeX{} primitive \cs{read}
% along with the |to| keyword.
% \end{texnote}
% \end{function}
%
% \begin{function}{\ior_gto:NN}
% \begin{syntax}
% \cs{ior_gto:NN} \meta{stream} \meta{token list variable}
% \end{syntax}
% Functions that reads one or more lines (until an equal number of left
% and right braces are found) from the input \meta{stream} and stores
% the result globally in the \meta{token list} variable. If the
% \meta{stream} is not open, input is requested from the terminal.
% The material read from the \meta{stream} will be tokenized by
% \TeX{} according to the category codes in force when the function
% is used.
% \begin{texnote}
% The is protected macro which expands to the \TeX{} primitives
% \cs{global} \cs{read} along with the |to| keyword.
% \end{texnote}
% \end{function}
%
% \begin{function}{\ior_str_to:NN}
% \begin{syntax}
% \cs{ior_str_to:NN} \meta{stream} \meta{token list variable}
% \end{syntax}
% Functions that reads one or more lines (until an equal number of left
% and right braces are found) from the input \meta{stream} and stores
% the result locally in the \meta{token list} variable. If the
% \meta{stream} is not open, input is requested from the terminal.
% The material read from the \meta{stream} as a series of tokens with
% category code $12$ (other), with the exception of space
% characters which are given category code $10$ (space).
% \begin{texnote}
% The is protected macro which expands to the \eTeX{} primitive
% \cs{readline} along with the |to| keyword.
% \end{texnote}
% \end{function}
%
% \begin{function}{\ior_str_gto:NN}
% \begin{syntax}
% \cs{ior_str_gto:NN} \meta{stream} \meta{token list variable}
% \end{syntax}
% Functions that reads one or more lines (until an equal number of left
% and right braces are found) from the input \meta{stream} and stores
% the result globally in the \meta{token list} variable. If the
% \meta{stream} is not open, input is requested from the terminal.
% The material read from the \meta{stream} as a series of tokens with
% category code $12$ (other), with the exception of space
% characters which are given category code $10$ (space).
% \begin{texnote}
% The is protected macro which expands to the primitives
% \cs{global} \cs{readline} along with the |to| keyword.
% \end{texnote}
% \end{function}
%
%\begin{function}[EXP,pTF]{\ior_if_eof:N}
% \begin{syntax}
% \cs{ior_if_eof_p:N} \meta{stream}
% \cs{ior_if_eof:NTF} \meta{stream} \Arg{true code} \Arg{false code}
% \end{syntax}
% Tests if the end of a \meta{stream} has been reached during a reading
% operation. The test will also return a \texttt{true} value if
% the \meta{stream} is not open or the \meta{file name} associated with
% a \meta{stream} does not exist at all. The branching versions then
% leave either \meta{true code} or \meta{false code} in the input
% stream, as appropriate to the truth of the test and the variant of
% the function chosen. The logical truth of the test is left in the
% input stream by the predicate version.
%\end{function}
%
% \section{Internal input--output functions}
%
% \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 \cs{ifeof}.
% \end{texnote}
% \end{function}
%
% \begin{function}{\ior_raw_new:N, \ior_raw_new:c}
% \begin{syntax}
% \cs{ior_raw_new:N} \meta{stream}
% \end{syntax}
% Directly allocates a new stream for reading, bypassing the stack
% system. This is to be used only when a new stream is required at a
% \TeX{} level, when a new stream is requested by the stack itself.
% \end{function}
%
% \begin{function}{\iow_raw_new:N, \iow_raw_new:c}
% \begin{syntax}
% \cs{iow_raw_new:N} \meta{stream}
% \end{syntax}
% Directly allocates a new stream for writing, bypassing the stack
% system. This is to be used only when a new stream is required at a
% \TeX{} level, when a new stream is requested by the stack itself.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3io} implementation}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \begin{macrocode}
%<*package>
\ProvidesExplPackage
{\ExplFileName}{\ExplFileDate}{\ExplFileVersion}{\ExplFileDescription}
\package_check_loaded_expl:
%</package>
% \end{macrocode}
%
% \subsection{Primitives}
%
% \begin{macro}{\if_eof:w}
% The primitive conditional
% \begin{macrocode}
\cs_new_eq:NN \if_eof:w \tex_ifeof:D
% \end{macrocode}
% \end{macro}
%
% \subsection{Variables and constants}
%
% \begin{variable}{\c_iow_term_stream, \c_ior_term_stream}
% \begin{variable}{\c_iow_log_stream, \c_ior_log_stream}
% Here we allocate two output streams for writing to the transcript
% file only (\cs{c_iow_log_stream}) and to both the terminal and
% transcript file (\cs{c_iow_term_stream}). Both can be used to read
% from and have equivalent \cs{c_ior} versions.
% \begin{macrocode}
\cs_new_eq:NN \c_iow_term_stream \c_sixteen
\cs_new_eq:NN \c_ior_term_stream \c_sixteen
\cs_new_eq:NN \c_iow_log_stream \c_minus_one
\cs_new_eq:NN \c_ior_log_stream \c_minus_one
% \end{macrocode}
% \end{variable}
% \end{variable}
%
% \begin{variable}{\c_iow_streams_tl, \c_ior_streams_tl}
% The list of streams available, by number.
% \begin{macrocode}
\tl_const:Nn \c_iow_streams_tl
{
\c_zero
\c_one
\c_two
\c_three
\c_four
\c_five
\c_six
\c_seven
\c_eight
\c_nine
\c_ten
\c_eleven
\c_twelve
\c_thirteen
\c_fourteen
\c_fifteen
}
\cs_new_eq:NN \c_ior_streams_tl \c_iow_streams_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_iow_streams_prop, \g_ior_streams_prop}
% The allocations for streams are stored in property lists, which
% are set up to have a \enquote{full} set of allocations from the start.
% In package mode, a few slots are always taken, so these are
% blocked off from use.
% \begin{macrocode}
\prop_new:N \g_iow_streams_prop
\prop_new:N \g_ior_streams_prop
%<*package>
\prop_put:Nnn \g_iow_streams_prop { 0 } { LaTeX2e~reserved }
\prop_put:Nnn \g_iow_streams_prop { 1 } { LaTeX2e~reserved }
\prop_put:Nnn \g_iow_streams_prop { 2 } { LaTeX2e~reserved }
\prop_put:Nnn \g_ior_streams_prop { 0 } { LaTeX2e~reserved }
%</package>
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_iow_stream_int, \l_ior_stream_int}
% Used to track the number allocated to the stream being created:
% this is taken from the property list but does alter.
% \begin{macrocode}
\int_new:N \l_iow_stream_int
\cs_new_eq:NN \l_ior_stream_int \l_iow_stream_int
% \end{macrocode}
% \end{variable}
%
% \subsection{Stream management}
%
% \begin{macro}[int]{\ior_raw_new:N, \ior_raw_new:c}
% \begin{macro}[int]{\iow_raw_new:N, \iow_raw_new:c}
% The lowest level for stream management is actually creating raw \TeX{}
% streams. As these are very limited (even with \eTeX{}), this should not
% be addressed directly.
% \begin{macrocode}
%<*initex>
\alloc_setup_type:nnn { ior } \c_zero \c_sixteen
\cs_new_protected_nopar:Npn \ior_raw_new:N #1
{ \alloc_reg:nNN { ior } \tex_chardef:D #1 }
\alloc_setup_type:nnn { iow } \c_zero \c_sixteen
\cs_new_protected_nopar:Npn \iow_raw_new:N #1
{ \alloc_reg:nNN { iow } \tex_chardef:D #1 }
%</initex>
%<*package>
\cs_set_eq:NN \iow_raw_new:N \newwrite
\cs_set_eq:NN \ior_raw_new:N \newread
%</package>
\cs_generate_variant:Nn \ior_raw_new:N { c }
\cs_generate_variant:Nn \iow_raw_new:N { c }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_open:Nn, \ior_open:cn}
% \begin{macro}{\iow_open:Nn, \iow_open:cn}
% In both cases, opening a stream starts with a call to the closing
% function: this is safest. There is then a loop through the
% allocation number list to find the first free stream number.
% When one is found the allocation can take place, the information
% can be stored and finally the file can actually be opened.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \ior_open:Nn #1#2
{
\ior_close:N #1
\int_set:Nn \l_ior_stream_int \c_sixteen
\tl_map_function:NN \c_ior_streams_tl \ior_alloc_read:n
\int_compare:nNnTF \l_ior_stream_int = \c_sixteen
{ \msg_kernel_error:nn { ior } { streams-exhausted } }
{
\ior_stream_alloc:N #1
\prop_gput:NVn \g_ior_streams_prop \l_ior_stream_int {#2}
\tex_openin:D #1#2 \scan_stop:
}
}
\cs_new_protected_nopar:Npn \iow_open:Nn #1#2
{
\iow_close:N #1
\int_set:Nn \l_iow_stream_int \c_sixteen
\tl_map_function:NN \c_iow_streams_tl \iow_alloc_write:n
\int_compare:nNnTF \l_iow_stream_int = \c_sixteen
{ \msg_kernel_error:nn { iow } { streams-exhausted } }
{
\iow_stream_alloc:N #1
\prop_gput:NVn \g_iow_streams_prop \l_iow_stream_int {#2}
\tex_immediate:D \tex_openout:D #1#2 \scan_stop:
}
}
\cs_generate_variant:Nn \ior_open:Nn { c }
\cs_generate_variant:Nn \iow_open:Nn { c }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[aux]{\ior_alloc_read:n}
% \begin{macro}[aux]{\iow_alloc_write:n}
% These functions are used to see if a particular stream is available.
% The property list contains file names for streams in use, so
% any unused ones are for the taking.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_alloc_write:n #1
{
\prop_if_in:NnF \g_iow_streams_prop {#1}
{
\int_set:Nn \l_iow_stream_int {#1}
\tl_map_break:
}
}
\cs_new_protected_nopar:Npn \ior_alloc_read:n #1
{
\prop_if_in:NnF \g_iow_streams_prop {#1}
{
\int_set:Nn \l_ior_stream_int {#1}
\tl_map_break:
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[aux]{\iow_stream_alloc:N}
% \begin{macro}[aux]{\ior_stream_alloc:N}
% \begin{macro}[aux]{\iow_stream_alloc_aux:}
% \begin{macro}[aux]{\ior_stream_alloc_aux:}
% \begin{variable}{\g_iow_tmp_stream}
% \begin{variable}{\g_ior_tmp_stream}
% Allocating a raw stream is much easier in \IniTeX{} mode than for
% the package. For the format, all streams will be allocated by
% \pkg{l3io} and so there is a simple check to see if a raw
% stream is actually available. On the other hand, for the
% package there will be non-managed streams. So if the managed
% one is not open, a check is made to see if some other managed
% stream is available before deciding to open a new one. If a new
% one is needed, we get the number allocated by \LaTeXe{} to get
% \enquote{back on track} with allocation.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_stream_alloc:N #1
{
\cs_if_exist:cTF { g_iow_ \int_use:N \l_iow_stream_int _stream }
{ \cs_gset_eq:Nc #1 { g_iow_ \int_use:N \l_iow_stream_int _stream } }
{
%<*package>
\iow_stream_alloc_aux:
\int_compare:nNnT \l_iow_stream_int = \c_sixteen
{
\iow_raw_new:N \g_iow_tmp_stream
\int_set:Nn \l_iow_stream_int { \g_iow_tmp_stream }
\cs_gset_eq:cN
{ g_iow_ \int_use:N \l_iow_stream_int _stream }
\g_iow_tmp_stream
}
%</package>
%<*initex>
\iow_raw_new:c { g_iow_ \int_use:N \l_iow_stream_int _stream }
%</initex>
\cs_gset_eq:Nc #1 { g_iow_ \int_use:N \l_iow_stream_int _stream }
}
}
%<*package>
\cs_new_protected_nopar:Npn \iow_stream_alloc_aux:
{
\int_incr:N \l_iow_stream_int
\int_compare:nNnT \l_iow_stream_int < \c_sixteen
{
\cs_if_exist:cTF { g_iow_ \int_use:N \l_iow_stream_int _stream }
{
\prop_if_in:NVT \g_iow_streams_prop \l_iow_stream_int
{ \iow_stream_alloc_aux: }
}
{ \iow_stream_alloc_aux: }
}
}
%</package>
\cs_new_protected_nopar:Npn \ior_stream_alloc:N #1
{
\cs_if_exist:cTF { g_ior_ \int_use:N \l_ior_stream_int _stream }
{ \cs_gset_eq:Nc #1 { g_ior_ \int_use:N \l_ior_stream_int _stream } }
{
%<*package>
\ior_stream_alloc_aux:
\int_compare:nNnT \l_ior_stream_int = \c_sixteen
{
\ior_raw_new:N \g_ior_tmp_stream
\int_set:Nn \l_ior_stream_int { \g_ior_tmp_stream }
\cs_gset_eq:cN
{ g_ior_ \int_use:N \l_iow_stream_int _stream }
\g_ior_tmp_stream
}
%</package>
%<*initex>
\ior_raw_new:c { g_ior_ \int_use:N \l_ior_stream_int _stream }
%</initex>
\cs_gset_eq:Nc #1 { g_ior_ \int_use:N \l_ior_stream_int _stream }
}
}
%<*package>
\cs_new_protected_nopar:Npn \ior_stream_alloc_aux:
{
\int_incr:N \l_ior_stream_int
\int_compare:nNnT \l_ior_stream_int < \c_sixteen
{
\cs_if_exist:cTF { g_ior_ \int_use:N \l_ior_stream_int _stream }
{
\prop_if_in:NVT \g_ior_streams_prop \l_ior_stream_int
{ \ior_stream_alloc_aux: }
}
{ \ior_stream_alloc_aux: }
}
}
%</package>
% \end{macrocode}
% \end{variable}
% \end{variable}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\iow_close:N, \iow_close:c}
% \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_nopar:Npn \ior_close:N #1
{
\cs_if_exist:NT #1
{
\int_compare:nNnF #1 = \c_minus_one
{
\tex_closein:D #1
\prop_gdel:NV \g_ior_streams_prop #1
\cs_undefine:N #1
}
}
}
\cs_new_protected_nopar:Npn \iow_close:N #1
{
\cs_if_exist:NT #1
{
\int_compare:nNnF #1 = \c_minus_one
{
\tex_immediate:D \tex_closeout:D #1
\prop_gdel:NV \g_iow_streams_prop #1
\cs_undefine:N #1
}
}
}
\cs_generate_variant:Nn \ior_close:N { c }
\cs_generate_variant:Nn \iow_close:N { c }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_list_streams:}
% \begin{macro}{\iow_list_streams:}
% \begin{macro}[aux]{\iow_show_aux:nn}
% \begin{macro}[aux]{\ior_show_aux:nn}
% Show the property lists, but with some \enquote{pretty printing}.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \ior_list_streams:
{
\prop_if_empty:NTF \g_ior_streams_prop
{
\iow_term:x { No~input~streams~are~open }
\tl_show:n { }
}
{
\iow_term:x { The~following~input~streams~are~in~use: }
\tl_set:Nx \l_prop_show_tl
{ \prop_map_function:NN \g_ior_streams_prop \ior_show_aux:nn }
\etex_showtokens:D \exp_after:wN \exp_after:wN \exp_after:wN
{ \exp_after:wN \prop_show_aux:w \l_prop_show_tl }
}
}
\cs_new:Npn \ior_show_aux:nn #1#2
{
\iow_newline: > \c_space_tl \c_space_tl
#1 \iow_char:N
\c_space_tl \c_space_tl => \c_space_tl \c_space_tl
\exp_not:n {#2}
}
\cs_new_protected_nopar:Npn \iow_list_streams:
{
\prop_if_empty:NTF \g_iow_streams_prop
{
\iow_term:x { No~output~streams~are~open }
\tl_show:n { }
}
{
\iow_term:x { The~following~output~streams~are~in~use: }
\tl_set:Nx \l_prop_show_tl
{ \prop_map_function:NN \g_iow_streams_prop \iow_show_aux:nn }
\etex_showtokens:D \exp_after:wN \exp_after:wN \exp_after:wN
{ \exp_after:wN \prop_show_aux:w \l_prop_show_tl }
}
}
\cs_new_eq:NN \iow_show_aux:nn \ior_show_aux:nn
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% Text for the error messages.
% \begin{macrocode}
\msg_kernel_new:nnnn { iow } { streams-exhausted }
{ Output~streams~exhausted }
{
TeX~can~only~open~up~to~16~output~streams~at~one~time.\\
All~16 are currently~in~use,~and~something~wanted~to~open
another~one.
}
\msg_kernel_new:nnnn { ior } { streams-exhausted }
{ Input~streams~exhausted }
{
TeX~can~only~open~up~to~16~input~streams~at~one~time.\\
All~16 are currently~in~use,~and~something~wanted~to~open
another~one.
}
% \end{macrocode}
%
% \subsection{Deferred writing}
%
% \begin{macro}{\iow_shipout_x:Nn, \iow_shipout_x:Nx}
% First the easy part, this is the primitive.
% \begin{macrocode}
\cs_new_eq:NN \iow_shipout_x:Nn \tex_write:D
\cs_generate_variant:Nn \iow_shipout_x:Nn { Nx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_shipout:Nn, \iow_shipout:Nx}
% With \eTeX{} available deferred writing is easy.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_shipout:Nn #1#2
{ \iow_shipout_x:Nn #1 { \exp_not:n {#2} } }
\cs_generate_variant:Nn \iow_shipout:Nn { Nx }
% \end{macrocode}
% \end{macro}
%
% \subsection{Immediate writing}
%
% \begin{macro}{\iow_now:Nx}
% An abbreviation for an often used operation, which immediately
% writes its second argument expanded to the output stream.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_now:Nx { \tex_immediate:D \iow_shipout_x:Nn }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_now:Nn}
% 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.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_now:Nn #1#2
{ \iow_now:Nx #1 { \exp_not:n {#2} } }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_log:n, \iow_log:x}
% \begin{macro}{\iow_term:n, \iow_term:x}
% Writing to the log and the terminal directly are relatively easy.
% \begin{macrocode}
\cs_set_protected_nopar:Npn \iow_log:x { \iow_now:Nx \c_iow_log_stream }
\cs_new_protected_nopar:Npn \iow_log:n { \iow_now:Nn \c_iow_log_stream }
\cs_set_protected_nopar:Npn \iow_term:x { \iow_now:Nx \c_iow_term_stream }
\cs_new_protected_nopar:Npn \iow_term:n { \iow_now:Nn \c_iow_term_stream }
% \end{macrocode}
%\end{macro}
%\end{macro}
%
% \begin{macro}{\iow_now_when_avail:Nn, \iow_now_when_avail:Nx}
% For writing only if the stream requested is open at all.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_now_when_avail:Nn #1
{ \cs_if_free:NTF #1 { \use_none:n } { \iow_now:Nn #1 } }
\cs_new_protected_nopar:Npn \iow_now_when_avail:Nx #1
{ \cs_if_free:NTF #1 { \use_none:n } { \iow_now:Nx #1 } }
% \end{macrocode}
% \end{macro}
%
% \subsection{Hard-wrapping lines based on length}
%
% The code here implements a generic hard-wrapping function. This is
% used by the messaging system, but is designed such that it is
% available for other uses.
%
% \begin{macro}{\l_iow_line_length_int}
% The is the \enquote{raw} length of a line which can be written to
% file. The standard value is the line length typically used by
% \TeX{}Live and Mik\TeX{}.
% \begin{macrocode}
\int_new:N \l_iow_line_length_int
\int_set:Nn \l_iow_line_length_int { 78 }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_iow_target_length_int}
% This stores the target line length: the full length minus any
% part for a leader at the start of each line.
% \begin{macrocode}
\int_new:N \l_iow_target_length_int
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_iow_current_line_int, \l_iow_current_word_int}
% These store the number of characters in the line and word currently
% being constructed, respectively.
% \begin{macrocode}
\int_new:N \l_iow_current_line_int
\int_new:N \l_iow_current_word_int
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_iow_current_line_tl, \l_iow_current_word_tl}
% These hold the current line of text and current word, respectively.
% \begin{macrocode}
\tl_new:N \l_iow_current_line_tl
\tl_new:N \l_iow_current_word_tl
% \end{macrocode}
%\end{macro}
%
% \begin{macro}[aux]{\l_iow_wrap_tl}
% Used for the expansion step before detokenizing.
% \begin{macrocode}
\tl_new:N \l_iow_wrap_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[aux]{\l_iow_wrapped_tl}
% The output from wrapping text: fully expanded and with lines
% which are not overly long.
% \begin{macrocode}
\tl_new:N \l_iow_wrapped_tl
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\q_iow_stop}
% A quark which will not appear elsewhere.
% \begin{macrocode}
\quark_new:N \q_iow_stop
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\l_iow_line_start_bool}
% Boolean to avoid adding a space at the beginning of lines.
% \begin{macrocode}
\bool_new:N \l_iow_line_start_bool
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_wrap:xnnnN}
% \begin{macro}[aux]{\iow_wrap_loop:w}
% \begin{macro}[aux]{\iow_wrap_word:}
% \begin{macro}[aux]{\iow_wrap_word_fits:}
% \begin{macro}[aux]{\iow_wrap_word_newline:}
% \begin{macro}[aux]{\iow_wrap_newline:}
% \begin{macro}[aux]{\iow_wrap_end:}
% The main wrapping function works as follows. The target number of
% characters in a line is calculated, before fully-expanding the input
% such that |\\| and \verb*|\ | are converted into the appropriate
% values. There is then a loop over each word in the input, which
% will do the actual wrapping. After the loop, the resulting text is
% passed on to the function which has been given as a post-processor.
% The argument |#4| is available for additional set up steps for
% the output.
% \begin{macrocode}
\cs_new_protected:Npn \iow_wrap:xnnnN #1#2#3#4#5
{
\group_begin:
\int_set:Nn \l_iow_target_length_int { \l_iow_line_length_int - ( #3 ) }
\int_zero:N \l_iow_current_line_int
\tl_clear:N \l_iow_current_line_tl
\tl_clear:N \l_iow_wrap_tl
\bool_set_true:N \l_iow_line_start_bool
\cs_set:Npx \\ { \c_space_tl \iow_newline: \c_space_tl }
\cs_set_eq:NN \ \c_space_tl
#4
%<*initex>
\tl_set:Nx \l_iow_wrap_tl {#1}
%</initex>
%<*package>
\protected@edef \l_iow_wrap_tl {#1}
%</package>
\cs_set:Npn \\ { \iow_newline: #2 }
\use:x
{
\exp_not:N \iow_wrap_loop:w
\tl_to_str:N \l_iow_wrap_tl \c_space_tl
\exp_not:N \q_iow_stop \c_space_tl
}
\exp_args:NNo \group_end:
#5 \l_iow_wrapped_tl
}
% \end{macrocode}
% The loop grabs one word in the input, and checks whether it is
% the end, or a forced new line, or a normal word.
% \begin{macrocode}
\cs_new_protected:Npn \iow_wrap_loop:w #1 ~ %
{
\tl_set:Nn \l_iow_current_word_tl {#1}
\tl_if_eq:NNTF \l_iow_current_word_tl \iow_newline:
{ \iow_wrap_newline: }
{
\tl_if_eq:NNTF \l_iow_current_word_tl \q_iow_stop
{ \iow_wrap_end: }
{ \iow_wrap_word: }
}
}
% \end{macrocode}
% For a normal word, update the line length, then test if the current
% word would fit in the current line, and call the appropriate function.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_wrap_word:
{
\int_set:Nn \l_iow_current_word_int
{ \str_length_skip_spaces:N \l_iow_current_word_tl }
\int_add:Nn \l_iow_current_line_int { \l_iow_current_word_int }
\int_compare:nNnTF \l_iow_current_line_int
< \l_iow_target_length_int
{ \iow_wrap_word_fits: }
{ \iow_wrap_word_newline: }
\iow_wrap_loop:w
}
% \end{macrocode}
% If the word fits in the current line, add it to the line, preceded by
% a space unless it is the first word of the line.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_wrap_word_fits:
{
\bool_if:NTF \l_iow_line_start_bool
{
\bool_set_false:N \l_iow_line_start_bool
\tl_set_eq:NN \l_iow_current_line_tl \l_iow_current_word_tl
}
{
\tl_put_right:Nx \l_iow_current_line_tl
{ ~ \l_iow_current_word_tl }
\int_incr:N \l_iow_current_line_int
}
}
% \end{macrocode}
% Otherwise, the current line is added to the result, with the run-on text.
% The current word (and its length) are then put in the new line.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_wrap_word_newline:
{
\tl_put_right:Nx \l_iow_wrapped_tl
{ \l_iow_current_line_tl \\ }
\int_set_eq:NN \l_iow_current_line_int \l_iow_current_word_int
\tl_set_eq:NN \l_iow_current_line_tl \l_iow_current_word_tl
}
% \end{macrocode}
% Forced newlines are almost identical to those caused by overflow,
% except that here the word is empty. And remember to continue the loop!
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_wrap_newline:
{
\tl_put_right:Nx \l_iow_wrapped_tl
{ \l_iow_current_line_tl \\ }
\int_zero:N \l_iow_current_line_int
\tl_clear:N \l_iow_current_line_tl
\bool_set_true:N \l_iow_line_start_bool
\iow_wrap_loop:w
}
% \end{macrocode}
% At the end, we simply save the last line (without the run-on text).
% \begin{macrocode}
\cs_new_protected_nopar:Npn \iow_wrap_end:
{
\tl_put_right:Nx \l_iow_wrapped_tl
{ \l_iow_current_line_tl }
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\str_length_skip_spaces:N}
% \begin{macro}{\str_length_skip_spaces:n}
% \begin{macro}{\str_length_loop:NNNNNNNNN}
% The wrapping code requires to measure the number of character
% in each word. This could be done with \cs{tl_length:n}, but
% it is ten times faster (literally) to use the code below.
% \begin{macrocode}
\cs_new_nopar:Npn \str_length_skip_spaces:N
{ \exp_args:No \str_length_skip_spaces:n }
\cs_new:Npn \str_length_skip_spaces:n #1
{
\int_value:w \int_eval:w
\exp_after:wN \str_length_loop:NNNNNNNNN \tl_to_str:n {#1}
{X8}{X7}{X6}{X5}{X4}{X3}{X2}{X1}{X0} \q_stop
\int_eval_end:
}
\cs_new:Npn \str_length_loop:NNNNNNNNN #1#2#3#4#5#6#7#8#9
{
\if_catcode:w X #9
\exp_after:wN \use_none_delimit_by_q_stop:w
\else:
9 +
\exp_after:wN \str_length_loop:NNNNNNNNN
\fi:
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Special characters for writing}
%
% \begin{macro}{\iow_newline:}
% Global variable holding the character that forces a new line when
% something is written to an output stream
% \begin{macrocode}
\cs_new_nopar:Npn \iow_newline: { ^^J }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\iow_char:N}
% Function to write any escaped char to an output stream.
% \begin{macrocode}
\cs_new_eq:NN \iow_char:N \cs_to_str:N
% \end{macrocode}
% \end{macro}
%
% \subsection{Reading input}
%
% \begin{macro}[pTF]{\ior_if_eof_p:N}
% To test if some particular input stream is exhausted the following
% conditional is provided. As the pool model means that closed
% streams are undefined control sequences, the test has two parts.
% \begin{macrocode}
\prg_new_conditional:Nnn \ior_if_eof:N { p , T , F , TF }
{
\cs_if_exist:NTF #1
{
\if_eof:w #1
\prg_return_true:
\else:
\prg_return_false:
\fi:
}
{ \prg_return_true: }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_to:NN}
% \begin{macro}{\ior_gto:NN}
% And here we read from files.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \ior_to:NN #1#2
{ \tex_read:D #1 to #2 }
\cs_new_protected_nopar:Npn \ior_gto:NN #1#2
{ \pref_global:D \tex_read:D #1 to #2 }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_str_to:NN}
% \begin{macro}{\ior_str_gto:NN}
% Reading as strings is also a primitive wrapper.
% \begin{macrocode}
\cs_new_protected_nopar:Npn \ior_str_to:NN #1#2
{ \etex_readline:D #1 to #2 }
\cs_new_protected_nopar:Npn \ior_str_gto:NN #1#2
{ \pref_global:D \etex_readline:D #1 to #2 }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Deprecated functions}
%
% Deprecated on 2011-05-27, for removal by 2011-08-31.
%
% \begin{macro}{\iow_now_buffer_safe:Nn, \iow_now_buffer_safe:Nx}
% This is much more easily done using the wrapping system: there is
% an expansion there, so a bit of a hack is needed.
% \begin{macrocode}
\cs_new_protected:Npn \iow_now_buffer_safe:Nn #1#2
{ \iow_wrap:xnnnN { \exp_not:n {#2} } { } \c_zero { } \iow_now:Nn #1 }
\cs_new_protected:Npn \iow_now_buffer_safe:Nx #1#2
{ \iow_wrap:xnnnN {#2} { } \c_zero { } \iow_now:Nn #1 }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ior_new:N, \ior_new:c}
% \begin{macro}{\iow_new:N, \iow_new:c}
% As input--output operations are done using a stack, |new| operations seem
% out-of-place. They are therefore set up just to gobble the input.
% \begin{macrocode}
\cs_new_eq:NN \ior_new:N \use_none:n
\cs_new_eq:NN \ior_new:c \use_none:n
\cs_new_eq:NN \iow_new:N \use_none:n
\cs_new_eq:NN \iow_new:c \use_none:n
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\ior_open_streams:}
% \begin{macro}{\iow_open_streams:}
% Slightly misleading names.
% \begin{macrocode}
\cs_new_eq:NN \ior_open_streams: \ior_list_streams:
\cs_new_eq:NN \iow_open_streams: \iow_list_streams:
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|