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authorKarl Berry <karl@freefriends.org>2018-04-30 22:39:09 +0000
committerKarl Berry <karl@freefriends.org>2018-04-30 22:39:09 +0000
commita28e1bfccd6fe522fcd296426e4d89c7fb4f19b6 (patch)
treeb72347e08575b56fcfed87c4d837b48dcfd1e02a /Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
parentb40c37a9e22b8235ff9c0bc256d00f7af94304c3 (diff)
l3 (30apr18)
git-svn-id: svn://tug.org/texlive/trunk@47516 c570f23f-e606-0410-a88d-b1316a301751
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+% \iffalse meta-comment
+%
+%% File: l3kernel-functions.dtx Copyright (C) 2018 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
+%
+% 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}
+\end{document}
+%</driver>
+% \fi
+%
+% \title{^^A
+% The \pkg{l3kernel-functions} package\\ Kernel-reserved functions^^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 2018-04-30}
+%
+% \maketitle
+%
+% \begin{documentation}
+%
+% \end{documentation}
+%
+% \begin{implementation}
+%
+% \section{Internal kernel functions}
+%
+% \begin{function}{\__kernel_chk_cs_exist:N, \__kernel_chk_cs_exist:c}
+% \begin{syntax}
+% \cs{__kernel_chk_cs_exist:N} \meta{cs}
+% \end{syntax}
+% This function is only created if debugging is enabled. It checks
+% that \meta{cs} exists according to the criteria for
+% \cs{cs_if_exist_p:N}, and if not raises a kernel-level error.
+% \end{function}
+%
+% \begin{function}{\__kernel_chk_defined:NT}
+% \begin{syntax}
+% \cs{__kernel_chk_defined:NT} \meta{variable} \Arg{true code}
+% \end{syntax}
+% If \meta{variable} is not defined (according to
+% \cs{cs_if_exist:NTF}), this triggers an error, otherwise the
+% \meta{true code} is run.
+% \end{function}
+%
+% \begin{function}{\__kernel_chk_expr:nNnN}
+% \begin{syntax}
+% \cs{__kernel_chk_expr:nNnN} \Arg{expr} \meta{eval} \Arg{convert} \meta{caller}
+% \end{syntax}
+% This function is only created if debugging is enabled. By default
+% it is equivalent to \cs{use_i:nnnn}. When expression checking is
+% enabled, it leaves in the input stream the result of \cs{tex_the:D}
+% \meta{eval} \meta{expr} \cs{tex_relax:D} after checking that no
+% token was left over. If any token was not taken as part of the
+% expression, there is an error message displaying the result of the
+% evaluation as well as the \meta{caller}. For instance \meta{eval}
+% can be \cs{__int_eval:w} and \meta{caller} can be \cs{int_eval:n} or
+% \cs{int_set:Nn}. The argument \meta{convert} is empty except for mu
+% expressions where it is \cs{etex_mutoglue:D}, used for internal
+% purposes.
+% \end{function}
+%
+% \begin{function}{\__kernel_chk_var_exist:N}
+% \begin{syntax}
+% \cs{__kernel_chk_var_exist:N} \meta{var}
+% \end{syntax}
+% This function is only created if debugging is enabled. It checks
+% that \meta{var} is defined according to the criteria for
+% \cs{cs_if_exist_p:N}, and if not raises a kernel-level error.
+% \end{function}
+%
+% \begin{function}{\__kernel_chk_var_scope:NN}
+% \begin{syntax}
+% \cs{__kernel_chk_var_scope:NN} \meta{scope} \meta{var}
+% \end{syntax}
+% Checks the \meta{var} has the correct \meta{scope}, and if not
+% raises a kernel-level error. This function is only created if
+% debugging is enabled. The \meta{scope} is a single letter |l|, |g|,
+% |c| denoting local variables, global variables, or constants. More
+% precisely, if the variable name starts with a letter and an
+% underscore (normal \pkg{expl3} convention) the function checks that
+% this single letter matches the \meta{scope}. Otherwise the function
+% cannot know the scope \meta{var} the first time: instead, it defines
+% |\__debug_chk_/|\meta{var name} to store that information for the
+% next call. Thus, if a given \meta{var} is subject to assignments of
+% different scopes a kernel error will result.
+% \end{function}
+%
+% \begin{function}{\__kernel_chk_var_local:N, \__kernel_chk_var_global:N}
+% \begin{syntax}
+% \cs{__kernel_chk_var_local:N} \meta{var}
+% \cs{__kernel_chk_var_global:N} \meta{var}
+% \end{syntax}
+% Applies \cs{__kernel_chk_var_exist:N} \meta{var}, and assuming that is
+% true applies
+% \cs{__kernel_chk_var_scope:NN} \meta{scope} \meta{var}, where
+% \meta{scope} is |l| or~|g|.
+% \end{function}
+%
+% \begin{function}{\__kernel_cs_parm_from_arg_count:nnF}
+% \begin{syntax}
+% \cs{__kernel_cs_parm_from_arg_count:nnF} \Arg{follow-on} \Arg{args} \Arg{false code}
+% \end{syntax}
+% Evaluates the number of \meta{args} and leaves the \meta{follow-on} code
+% followed by a brace group containing the required number of primitive
+% parameter markers (|#1|, \emph{etc}.). If the number of \meta{args} is outside
+% the range $[0,9]$, the \meta{false code} is inserted \emph{instead} of
+% the \meta{follow-on}.
+% \end{function}
+%
+% \begin{function}{\__kernel_if_debug:TF}
+% \begin{syntax}
+% \cs{__kernel_if_debug:TF} \Arg{true code} \Arg{false code}
+% \end{syntax}
+% Runs the \meta{true code} if debugging is enabled, namely only in
+% \LaTeXe{} package mode with one of the options
+% \texttt{check-declarations}, \texttt{enable-debug}, or
+% \texttt{log-functions}. Otherwise runs the \meta{false code}. The
+% |T| and |F| variants are not provided for this low-level
+% conditional.
+% \end{function}
+%
+% \begin{function}{\__kernel_debug_log:x}
+% \begin{syntax}
+% \cs{__kernel_debug_log:x} \Arg{message text}
+% \end{syntax}
+% If the \texttt{log-functions} option is active, this function writes
+% the \meta{message text} to the log file using \cs{iow_log:x}.
+% Otherwise, the \meta{message text} is ignored using \cs{use_none:n}.
+% This function is only created if debugging is enabled.
+% \end{function}
+%
+% \begin{function}[EXP]{\__kernel_exp_not:w}
+% \begin{syntax}
+% \cs{__kernel_exp_not:w} \meta{expandable tokens} \Arg{content}
+% \end{syntax}
+% Carries out expansion on the \meta{expandable tokens} before preventing
+% further expansion of the \meta{content} as for \cs{exp_not:n}. Typically,
+% the \meta{expandable tokens} will alter the nature of the \meta{content},
+% \emph{i.e.}~allow it to be generated in some way.
+% \end{function}
+%
+% \begin{variable}{\l__kernel_expl_bool}
+% A boolean which records the current code syntax status: \texttt{true} if
+% currently inside a code environment. This variable should only be
+% set by \cs{ExplSyntaxOn}/\cs{ExplSyntaxOff}.
+% \end{variable}
+%
+% \begin{function}{\__kernel_file_missing:n}
+% \begin{syntax}
+% \cs{__kernel_file_missing:n} \Arg{name}
+% \end{syntax}
+% Expands the \meta{name} as per \cs{__kernel_file_name_sanitize:nN} then
+% produces an error message indicating that that file was not found.
+% \end{function}
+%
+% \begin{function}{\__kernel_file_name_sanitize:nN}
+% \begin{syntax}
+% \cs{__kernel_file_name_sanitize:nN} \Arg{name} \meta{str var}
+% \end{syntax}
+% For converting a \meta{name} to a string where active characters are treated
+% as strings.
+% \end{function}
+%
+% \begin{function}{\__kernel_file_input_push:n, \__kernel_file_input_pop:}
+% \begin{syntax}
+% \cs{__kernel_file_input_push:n} \Arg{name}
+% \cs{__kernel_file_input_pop:}
+% \end{syntax}
+% Used to push and pop data from the internal file stack: needed only
+% in package mode, where interfacing with the \LaTeXe{} kernel is necessary.
+% \end{function}
+%
+% \begin{function}{\__kernel_ior_open:Nn, \__kernel_ior_open:No}
+% \begin{syntax}
+% \cs{__kernel_ior_open:Nn} \meta{stream} \Arg{file name}
+% \end{syntax}
+% This function has identical syntax to the public version. However,
+% is does not take precautions against active characters in the
+% \meta{file name}, and it does not attempt to add a \meta{path} to
+% the \meta{file name}: it is therefore intended to be used by
+% higher-level
+% functions which have already fully expanded the \meta{file name} and which
+% need to perform multiple open or close operations. See for example the
+% implementation of \cs{file_get_full_name:nN},
+% \end{function}
+%
+% \begin{function}{\__kernel_iow_with:Nnn}
+% \begin{syntax}
+% \cs{__kernel_iow_with:Nnn} \meta{integer} \Arg{value} \Arg{code}
+% \end{syntax}
+% If the \meta{integer} is equal to the \meta{value} then this
+% function simply runs the \meta{code}. Otherwise it saves the
+% current value of the \meta{integer}, sets it to the \meta{value},
+% runs the \meta{code}, and restores the \meta{integer} to its former
+% value. This is used to ensure that the \tn{newlinechar} is~$10$
+% when writing to a stream, which lets \cs{iow_newline:} work, and
+% that \tn{errorcontextlines} is $-1$ when displaying a message.
+% \end{function}
+%
+% \begin{function}
+% {\__kernel_msg_new:nnnn, \__kernel_msg_new:nnn}
+% \begin{syntax}
+% \cs{__kernel_msg_new:nnnn} \Arg{module} \Arg{message} \Arg{text} \Arg{more text}
+% \end{syntax}
+% Creates a kernel \meta{message} for a given \meta{module}.
+% The message is defined to first give \meta{text} and then
+% \meta{more text} if the user requests it. If no \meta{more text} is
+% available then a standard text is given instead. Within \meta{text}
+% and \meta{more text} four parameters (|#1| to |#4|) can be used:
+% these will be supplied and expanded at the time the message is used.
+% An error is raised if the \meta{message} already exists.
+% \end{function}
+%
+% \begin{function}
+% {\__kernel_msg_set:nnnn, \__kernel_msg_set:nnn}
+% \begin{syntax}
+% \cs{__kernel_msg_set:nnnn} \Arg{module} \Arg{message} \Arg{text} \Arg{more text}
+% \end{syntax}
+% Sets up the text for a kernel \meta{message} for a given \meta{module}.
+% The message is defined to first give \meta{text} and then
+% \meta{more text} if the user requests it. If no \meta{more text} is
+% available then a standard text is given instead. Within \meta{text}
+% and \meta{more text} four parameters (|#1| to |#4|) can be used:
+% these will be supplied and expanded at the time the message is used.
+% \end{function}
+%
+% \begin{function}
+% {
+% \__kernel_msg_fatal:nnnnnn ,
+% \__kernel_msg_fatal:nnnnn ,
+% \__kernel_msg_fatal:nnnn ,
+% \__kernel_msg_fatal:nnn ,
+% \__kernel_msg_fatal:nn ,
+% \__kernel_msg_fatal:nnxxxx ,
+% \__kernel_msg_fatal:nnxxx ,
+% \__kernel_msg_fatal:nnxx ,
+% \__kernel_msg_fatal:nnx
+% }
+% \begin{syntax}
+% \cs{__kernel_msg_fatal:nnnnnn} \Arg{module} \Arg{message} \Arg{arg one} \Arg{arg two} \Arg{arg three} \Arg{arg four}
+% \end{syntax}
+% Issues kernel \meta{module} error \meta{message}, passing \meta{arg one}
+% to \meta{arg four} to the text-creating functions. After issuing a
+% fatal error the \TeX{} run halts. Cannot be redirected.
+% \end{function}
+%
+% \begin{function}
+% {
+% \__kernel_msg_error:nnnnnn ,
+% \__kernel_msg_error:nnnnn ,
+% \__kernel_msg_error:nnnn ,
+% \__kernel_msg_error:nnn ,
+% \__kernel_msg_error:nn ,
+% \__kernel_msg_error:nnxxxx ,
+% \__kernel_msg_error:nnxxx ,
+% \__kernel_msg_error:nnxx ,
+% \__kernel_msg_error:nnx
+% }
+% \begin{syntax}
+% \cs{__kernel_msg_error:nnnnnn} \Arg{module} \Arg{message} \Arg{arg one} \Arg{arg two} \Arg{arg three} \Arg{arg four}
+% \end{syntax}
+% Issues kernel \meta{module} error \meta{message}, passing \meta{arg one}
+% to
+% \meta{arg four} to the text-creating functions. The error
+% stops processing and issues the text at the terminal. After user input,
+% the run continues. Cannot be redirected.
+% \end{function}
+%
+% \begin{function}
+% {
+% \__kernel_msg_warning:nnnnnn ,
+% \__kernel_msg_warning:nnnnn ,
+% \__kernel_msg_warning:nnnn ,
+% \__kernel_msg_warning:nnn ,
+% \__kernel_msg_warning:nn ,
+% \__kernel_msg_warning:nnxxxx ,
+% \__kernel_msg_warning:nnxxx ,
+% \__kernel_msg_warning:nnxx ,
+% \__kernel_msg_warning:nnx
+% }
+% \begin{syntax}
+% \cs{__kernel_msg_warning:nnnnnn} \Arg{module} \Arg{message} \Arg{arg one} \Arg{arg two} \Arg{arg three} \Arg{arg four}
+% \end{syntax}
+% Issues kernel \meta{module} warning \meta{message}, passing
+% \meta{arg one} to
+% \meta{arg four} to the text-creating functions. The warning text
+% is added to the log file, but the \TeX{} run is not interrupted.
+% \end{function}
+%
+% \begin{function}
+% {
+% \__kernel_msg_info:nnnnnn ,
+% \__kernel_msg_info:nnnnn ,
+% \__kernel_msg_info:nnnn ,
+% \__kernel_msg_info:nnn ,
+% \__kernel_msg_info:nn ,
+% \__kernel_msg_info:nnxxxx ,
+% \__kernel_msg_info:nnxxx ,
+% \__kernel_msg_info:nnxx ,
+% \__kernel_msg_info:nnx
+% }
+% \begin{syntax}
+% \cs{__kernel_msg_info:nnnnnn} \Arg{module} \Arg{message} \Arg{arg one} \Arg{arg two} \Arg{arg three} \Arg{arg four}
+% \end{syntax}
+% Issues kernel \meta{module} information \meta{message}, passing
+% \meta{arg one} to \meta{arg four} to the text-creating functions.
+% The information text is added to the log file.
+% \end{function}
+%
+% \begin{function}[EXP]
+% {
+% \__kernel_msg_expandable_error:nnnnnn,
+% \__kernel_msg_expandable_error:nnnnn,
+% \__kernel_msg_expandable_error:nnnn,
+% \__kernel_msg_expandable_error:nnn,
+% \__kernel_msg_expandable_error:nn,
+% \__kernel_msg_expandable_error:nnffff,
+% \__kernel_msg_expandable_error:nnfff,
+% \__kernel_msg_expandable_error:nnff,
+% \__kernel_msg_expandable_error:nnf,
+% }
+% \begin{syntax}
+% \cs{__kernel_msg_expandable_error:nnnnnn} \Arg{module} \Arg{message} \Arg{arg one} \Arg{arg two} \Arg{arg three} \Arg{arg four}
+% \end{syntax}
+% Issues an error, passing \meta{arg one} to \meta{arg four}
+% to the text-creating functions. The resulting string must
+% be much shorter than a line, otherwise it is cropped.
+% \end{function}
+%
+% \begin{function}{\__kernel_patch:nnNNpn}
+% \begin{syntax}
+% \cs{__kernel_patch:nnNNpn} \Arg{before} \Arg{after}
+% \meta{definition} \meta{function} \meta{parameters} \Arg{code}
+% \end{syntax}
+% If debugging is not enabled, this function ignores the \meta{before}
+% and \meta{after} code and performs the \meta{definition} with no
+% patching. Otherwise it replaces \meta{code} by \meta{before}
+% \meta{code} \meta{after} (which can involve |#1| and so on) in the
+% \meta{definition} that follows. The \meta{definition} must start
+% with \cs{cs_new:Npn} or \cs{cs_set:Npn} or \cs{cs_gset:Npn} or their
+% \texttt{_protected} counterparts. Other cases can be added as
+% needed.
+% \end{function}
+%
+% \begin{function}{\__kernel_patch_conditional:nNNpnn}
+% \begin{syntax}
+% \cs{__kernel_patch_conditional:nNNpnn} \Arg{before}
+% \meta{definition} \meta{conditional} \meta{parameters} \Arg{type} \Arg{code}
+% \end{syntax}
+% Similar to \cs{__kernel_patch:nnNNpn} for conditionals, namely
+% \meta{definition} must be \cs{prg_new_conditional:Npnn} or its
+% \texttt{_protected} counterpart. There is no \meta{after} code
+% because that would interfere with the action of the conditional.
+% \end{function}
+%
+% \begin{function}
+% {\__kernel_patch_args:nNNpn, \__kernel_patch_conditional_args:nNNpnn}
+% \begin{syntax}
+% \cs{__kernel_patch_args:nNNpn} \Arg{arguments}
+% \meta{definition} \meta{function} \meta{parameters} \Arg{code}
+% \end{syntax}
+% Like \cs{__kernel_patch:nnNNpn}, this tweaks the following
+% definition, but from the \enquote{inside out} (and if debugging is
+% not enabled, the \meta{arguments} are ignored). It replaces |#1|,
+% |#2| and so on in the \meta{code} of the definition as indicated by
+% the \meta{arguments}. More precisely, a temporary function is
+% defined using the \meta{definition} with the \meta{parameters} and
+% \meta{code}, then the result of expanding that function once in
+% front of the \meta{arguments} is used instead of the \meta{code}
+% when defining the actual function. For instance,
+% \begin{quote}
+% \cs{__kernel_patch_args:nNNpn} |{ { (#1) } }| \\
+% \cs{cs_new:Npn} \cs{int_eval:n} |#1| \\
+% ~~|{ \int_value:w \__int_eval:w #1 \__int_eval_end: }|
+% \end{quote}
+% would replace |#1| by |(#1)| in the definition of \cs{int_eval:n} when
+% debugging is enabled. This fails if the \meta{code} contains~|##|.
+% The \cs{__kernel_patch_conditional_args:nNNpnn} function is for use
+% before \cs{prg_new_conditional:Npnn} or its \texttt{_protected}
+% counterpart.
+% \end{function}
+%
+% \begin{function}
+% {\__kernel_patch_args:nnnNNpn, \__kernel_patch_conditional_args:nnnNNpnn}
+% \begin{syntax}
+% \cs{__kernel_patch_args:nnnNNpn} \Arg{before} \Arg{after} \Arg{arguments}
+% \meta{definition} \meta{function} \meta{parameters} \Arg{code}
+% \end{syntax}
+% A combination of \cs{__kernel_patch:nnNNpn} and
+% \cs{__kernel_patch_args:nNNpn}.
+% \end{function}
+%
+% \begin{variable}{\g__kernel_prg_map_int}
+% This integer is used by non-expandable mapping functions to track
+% the level of nesting in force. The functions
+% \cs[no-index]{\meta{type}_map_1:w},
+% \cs[no-index]{\meta{type}_map_2:w}, \emph{etc.}, labelled by
+% \cs{g__kernel_prg_map_int}
+% hold functions to be mapped over various list datatypes in inline
+% and variable mappings.
+% \end{variable}
+%
+% \begin{function}{\__kernel_register_show:N, \__kernel_register_show:c}
+% \begin{syntax}
+% \cs{__kernel_register_show:N} \meta{register}
+% \end{syntax}
+% Used to show the contents of a \TeX{} register at the terminal, formatted
+% such that internal parts of the mechanism are not visible.
+% \end{function}
+%
+% \begin{function}
+% {\__kernel_register_log:N, \__kernel_register_log:c}
+% \begin{syntax}
+% \cs{__kernel_register_log:N} \meta{register}
+% \end{syntax}
+% Used to write the contents of a \TeX{} register to the log file in a
+% form similar to \cs{__kernel_register_show:N}.
+% \end{function}
+%
+% \begin{function}[EXP]{\__kernel_str_to_other:n}
+% \begin{syntax}
+% \cs{__kernel_str_to_other:n} \Arg{token list}
+% \end{syntax}
+% Converts the \meta{token list} to a \meta{other string}, where
+% spaces have category code \enquote{other}. This function can be
+% \texttt{f}-expanded without fear of losing a leading space, since
+% spaces do not have category code $10$ in its result. It takes a
+% time quadratic in the character count of the string.
+% \end{function}
+%
+% \begin{function}[rEXP]{\__kernel_str_to_other_fast:n}
+% \begin{syntax}
+% \cs{__kernel_str_to_other_fast:n} \Arg{token list}
+% \end{syntax}
+% Same behaviour \cs{__kernel_str_to_other:n} but only restricted-expandable.
+% It takes a time linear in the character count of the string.
+% \end{function}
+%
+% \begin{function}[EXP]{\__kernel_tl_to_str:w}
+% \begin{syntax}
+% \cs{__kernel_tl_to_str:w} \meta{expandable tokens} \Arg{tokens}
+% \end{syntax}
+% Carries out expansion on the \meta{expandable tokens} before conversion of
+% the \meta{tokens} to a string as describe for \cs{tl_to_str:n}. Typically,
+% the \meta{expandable tokens} will alter the nature of the \meta{tokens},
+% \emph{i.e.}~allow it to be generated in some way. This function requires
+% only a single expansion.
+% \end{function}
+%
+% \end{implementation}
+%
+% \PrintIndex