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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 2018-12-06}
%
% \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{tex_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_deprecation_code:nn}
% \begin{syntax}
% \cs{__kernel_deprecation_code:nn} \Arg{error code} \Arg{working code}
% \end{syntax}
% Stores both an \meta{error} and \meta{working} definition for given material
% such that they can be exchanged by \cs{debug_on:} and \cs{debug_off:}.
% \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}[EXP]{\__kernel_int_add:nnn}
% \begin{syntax}
% \cs{__kernel_int_add:nnn} \Arg{integer_1} \Arg{integer_2} \Arg{integer_3}
% \end{syntax}
% Expands to the result of adding the three \meta{integers} (which
% must be suitable input for \cs{int_eval:w}), avoiding intermediate
% overflow. Overflow occurs only if the overall result is outside
% $[-2^{31}+1,2^{31}-1]$. The \meta{integers} may be of the form
% \cs{int_eval:w} \dots{} \cs{scan_stop:} but may be evaluated more
% than once.
% \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_deprecation:nnNNpn}
% \begin{syntax}
% \cs{__kernel_patch_deprecation:nnNNpn} \Arg{before} \Arg{after}
% \meta{definition} \meta{function}\meta{parameters} \Arg{type} \Arg{code}
% \end{syntax}
% Similar to \cs{__kernel_patch:nnNNpn} for deprecated functions.
% \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{variable}{\c__kernel_randint_max_int}
% Maximal allowed argument to \cs{__kernel_randint:n}. Equal to
% $2^{17}-1$.
% \end{variable}
%
% \begin{function}{\__kernel_randint:n}
% \begin{syntax}
% \cs{__kernel_randint:n} \Arg{max}
% \end{syntax}
% Used in an integer expression this gives a pseudo-random number
% between $1$ and $\meta{max}$ included. One must have
% $\meta{max}\leq 2^{17}-1$. The \meta{max} must be suitable for
% \cs{int_value:w} (and any \cs{int_eval:w} must be terminated by
% \cs{scan_stop:} or equivalent).
% \end{function}
%
% \begin{function}{\__kernel_randint:nn}
% \begin{syntax}
% \cs{__kernel_randint:nn} \Arg{min} \Arg{max}
% \end{syntax}
% Used in an integer expression this gives a pseudo-random number
% between $\meta{min}$ and $\meta{max}$ included. The \meta{min} and
% \meta{max} must be suitable for \cs{int_value:w} (and any
% \cs{int_eval:w} must be terminated by \cs{scan_stop:} or
% equivalent). For small ranges
% $R=\meta{max}-\meta{min}+1\leq 2^{17}-1$,
% $\meta{min} - 1 + \cs{__kernel_randint:n} |{|R|}|$ is faster.
% \end{function}
%
% \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
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