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|
% \iffalse meta-comment
%
%% File: l3unicode.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{l3unicode} package: Unicode support 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 2018-10-26}
%
% \maketitle
%
% \begin{documentation}
%
% This module provides Unicode-specific functions along with loading data
% from a range of Unicode Consortium files. At present, it provides no
% public functions.
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3unicode} implementation}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=char>
% \end{macrocode}
%
% Case changing both for strings and \enquote{text} requires data from
% the Unicode Consortium. Some of this is build in to the format (as
% \tn{lccode} and \tn{uccode} values) but this covers only the simple
% one-to-one situations and does not fully handle for example case folding.
%
% As only the data needs to remain at the end of this process, everything
% is set up inside a group. The only thing that is outside is creating a
% stream: they are global anyway and it is best to force a stream for
% all engines.
% \begin{macrocode}
\ior_new:N \g_@@_data_ior
\bool_lazy_or:nnTF { \sys_if_engine_luatex_p: } { \sys_if_engine_xetex_p: }
{
\group_begin:
% \end{macrocode}
% Set up a private copy of the char-generation primitive.
% \begin{macrocode}
\cs_set_eq:NN \@@_generate:w \tex_Uchar:D
% \end{macrocode}
% Parse the main Unicode data file for title case exceptions (the one-to-one
% lower and upper case mappings it contains are all be covered by the \TeX{}
% data). There are no comments in the main data file so this can be done using
% a standard mapping and no checks.
% \begin{macrocode}
\ior_open:Nn \g_@@_data_ior { UnicodeData.txt }
\cs_set_protected:Npn \@@_data_auxi:w
#1 ; #2 ; #3 ; #4 ; #5 ; #6 ; #7 ; #8 ; #9 ;
{ \@@_data_auxii:w #1 ; }
\cs_set_protected:Npn \@@_data_auxii:w
#1 ; #2 ; #3 ; #4 ; #5 ; #6 ; #7 \q_stop
{
\tl_if_blank:nF {#7}
{
\str_if_eq:nnF {#5} {#7}
{
\tl_const:cx
{ c_@@_mixed_case_ \@@_generate:w "#1 _tl }
{
\char_generate:nn { "#7 }
{ \char_value_catcode:n { "#7 } }
}
}
}
}
\ior_map_inline:Nn \g_@@_data_ior
{
\tl_if_blank:nF {#1}
{ \@@_data_auxi:w #1 \q_stop }
}
\ior_close:N \g_@@_data_ior
% \end{macrocode}
% The other data files all use C-style comments so we have to worry about
% |#| tokens (and reading as strings). The set up for case folding is in two
% parts. For the basic (core) mappings, folding is the same as lower casing in
% most positions so only store the differences. For the more complex foldings,
% always store the result, splitting up the two or three code points in the input
% as required.
% \begin{macrocode}
\ior_open:Nn \g_@@_data_ior { CaseFolding.txt }
\cs_set_protected:Npn \@@_data_auxi:w #1 ;~ #2 ;~ #3 ; #4 \q_stop
{
\str_if_eq:nnTF {#2} { C }
{
\int_compare:nNnF
{ \char_value_lccode:n {"#1} } = {"#3}
{
\tl_const:cx
{ c_@@_fold_case_ \@@_generate:w "#1 _tl }
{
\char_generate:nn { "#3 }
{ \char_value_catcode:n { "#3 } }
}
}
}
{
\str_if_eq:nnT {#2} { F }
{ \@@_data_auxii:w #1 ~ #3 ~ \q_stop }
}
}
\cs_set_protected:Npn \@@_data_auxii:w #1 ~ #2 ~ #3 ~ #4 \q_stop
{
\tl_const:cx { c_@@_fold_case_ \@@_generate:w "#1 _tl }
{
\char_generate:nn { "#2 }
{ \char_value_catcode:n { "#2 } }
\char_generate:nn { "#3 }
{ \char_value_catcode:n { "#3 } }
\tl_if_blank:nF {#4}
{
\char_generate:nn { "#4 }
{ \char_value_catcode:n { "#4 } }
}
}
}
\ior_str_map_inline:Nn \g_@@_data_ior
{
\tl_if_blank:nF {#1}
{
\str_if_eq:eeF { \tl_head:n {#1} } { \c_hash_str }
{ \@@_data_auxi:w #1 \q_stop }
}
}
\ior_close:N \g_@@_data_ior
% \end{macrocode}
% For upper and lower casing special situations, there is a bit more to
% do as we also have title casing to consider, plus we need to stop part-way
% through the file.
% \begin{macrocode}
\ior_open:Nn \g_@@_data_ior { SpecialCasing.txt }
\cs_set_protected:Npn \@@_data_auxi:w
#1 ;~ #2 ;~ #3 ;~ #4 ; #5 \q_stop
{
\use:n { \@@_data_auxii:w #1 ~ lower ~ #2 ~ } ~ \q_stop
\use:n { \@@_data_auxii:w #1 ~ upper ~ #4 ~ } ~ \q_stop
\str_if_eq:nnF {#3} {#4}
{ \use:n { \@@_data_auxii:w #1 ~ mixed ~ #3 ~ } ~ \q_stop }
}
\cs_set_protected:Npn \@@_data_auxii:w
#1 ~ #2 ~ #3 ~ #4 ~ #5 \q_stop
{
\tl_if_empty:nF {#4}
{
\tl_const:cx { c_@@_ #2 _case_ \@@_generate:w "#1 _tl }
{
\char_generate:nn { "#3 }
{ \char_value_catcode:n { "#3 } }
\char_generate:nn { "#4 }
{ \char_value_catcode:n { "#4 } }
\tl_if_blank:nF {#5}
{
\char_generate:nn { "#5 }
{ \char_value_catcode:n { "#5 } }
}
}
}
}
\ior_str_map_inline:Nn \g_@@_data_ior
{
\tl_if_blank:nF {#1}
{
\str_if_eq:eeTF { \tl_head:n {#1} } { \c_hash_str }
{
\str_if_eq:eeT
{#1}
{ \c_hash_str \c_space_tl Conditional~Mappings }
{ \ior_map_break: }
}
{ \@@_data_auxi:w #1 \q_stop }
}
}
\ior_close:N \g_@@_data_ior
\group_end:
}
% \end{macrocode}
% For the $8$-bit engines, the above is skipped but there is still some
% set up required. As case changing can only be applied to bytes, and
% they have to be in the ASCII range, we define a series of data stores
% to represent them, and the data are used such that only these are
% ever case-changed. We do open and close one file to force allocation of
% a read: this keeps all engines in line.
% \begin{macrocode}
{
\group_begin:
\cs_set_protected:Npn \@@_tmp:NN #1#2
{
\quark_if_recursion_tail_stop:N #2
\tl_const:cn { c_@@_upper_case_ #2 _tl } {#1}
\tl_const:cn { c_@@_lower_case_ #1 _tl } {#2}
\tl_const:cn { c_@@_fold_case_ #1 _tl } {#2}
\@@_tmp:NN
}
\@@_tmp:NN
AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz
? \q_recursion_tail \q_recursion_stop
\ior_open:Nn \g_@@_data_ior { UnicodeData.txt }
\ior_close:N \g_@@_data_ior
\group_end:
}
% \end{macrocode}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
|
