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%%
%% Copyright (C) 2020 by Xiangdong Zeng <xdzeng96@gmail.com>
%%
%% This work may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either
%% version 1.3c of this license or (at your option) any later
%% version. The latest version of this license is in:
%%
%% http://www.latex-project.org/lppl.txt
%%
%% and version 1.3 or later is part of all distributions of
%% LaTeX version 2005/12/01 or later.
%%
%% This work has the LPPL maintenance status `maintained'.
%%
%% The Current Maintainer of this work is Xiangdong Zeng.
%%
\NeedsTeXFormat{LaTeX2e}[2020/02/02]
\ProvidesExplPackage{emoji}{2020/06/27}{0.2.1}{Emoji support in (Lua)LaTeX}
\msg_new:nnn { emoji } { require-luatex }
{ The~'emoji'~package~requires~LuaTeX. }
\sys_if_engine_luatex:F
{ \msg_critical:nn { emoji } { require-luatex } }
\RequirePackage { fontspec }
% Set emoji font. Internally use fontspec's `\setfontface`.
% #1: option
% #2: name
\NewDocumentCommand \setemojifont { m o }
{
\__emoji_if_preamble:TF
{ \AtBeginDocument }
{ \use:n }
{
\IfValueTF {#2}
{ \emoji_set_font:nn {#1} {#2} }
{ \emoji_set_font:n {#1} }
}
}
% Check if in the preamble.
\prg_set_conditional:Npnn \__emoji_if_preamble: { TF }
{
\cs_if_eq:NNTF \@onlypreamble \@notprerr
{ \prg_return_false: }
{ \prg_return_true: }
}
% Define `\emoji_font:` when used.
\cs_new_protected:Npn \emoji_set_font:nn #1#2
{ \setfontface \emoji_font: {#1} [ Renderer = HarfBuzz, #2 ] }
\cs_new_protected:Npn \emoji_set_font:n #1
{ \emoji_set_font:nn {#1} {} }
% Detect available emoji fonts from OS or TEXMF tree. Currently support:
% - Apple Color Emoji
% - Segoe UI Emoji
% - Noto Color Emoji
% Remarks:
% - `\file_if_exist:nTF` is much faster than `\fontspec_font_if_exist:nTF`.
% - We use environment variable `$WINDIR` for path on Windows.
\cs_new_protected:Npn \__emoji_detect_font:
{
\file_if_exist:nTF { /System/Library/Fonts/Apple~Color~Emoji.ttc }
{ \emoji_set_font:n { Apple~Color~Emoji } }
{
\file_if_exist:nTF { \c_dollar_str WINDIR/Fonts/seguiemj.ttf }
{ \emoji_set_font:n { Segoe~UI~Emoji } }
{
\fontspec_font_if_exist:nTF { Noto~Color~Emoji }
{ \emoji_set_font:n { Noto~Color~Emoji } }
{ \msg_warning:nn { emoji } { no-emoji-font } }
}
}
}
\msg_new:nnn { emoji } { no-emoji-font }
{
It~seems~that~you~have~not~declare~an~emoji~font. \\
You~should~use~"\setemojifont"~to~set~a~font.
}
% If the user doesn't set emoji font explicitly, then detect and set default
% fonts automatically.
\AtBeginDocument
{
\cs_if_exist_use:NF \emoji_font:
{ \__emoji_detect_font: }
}
% The main command for use emoji.
% #1: name
\NewDocumentCommand \emoji { m }
{
% TODO: options
\emoji_if_name_exist:nTF {#1}
{ \emoji_print:n {#1} }
{ \msg_error:nnn { emoji } { emoji-not-exist } {#1} }
}
\msg_new:nnn { emoji } { emoji-not-exist }
{
The~emoji~name~"#1"~can't~be~found. \\
Please~check~your~spelling~or~try~another~one.
}
% Check if an emoji name exists or not.
% #1: name
\prg_new_protected_conditional:Npnn \emoji_if_name_exist:n #1 { T, F, TF }
{
\tl_if_exist:cTF { c__emoji_ #1 _tl }
{ \prg_return_true: }
{ \prg_return_false: }
}
% In a group, change to the emoji font then use corresponding tl constant.
\cs_new_protected:Npn \emoji_print:n #1
{
\group_begin:
\emoji_font:
\tl_use:c { c__emoji_ #1 _tl }
\group_end:
}
% Define new emoji. They are stored in tl constants internally.
% For special characters (#), we first change their catcode to 12 (other),
% then define the tl constant.
% This function is mainly used in `emoji-table.def`, but will be changed to
% print the table in the documentation.
% #1: Code points
% #2: Name
% #3: Aliases
% #4: Description
% #5: Version
\cs_new_protected:Npn \__emoji_def:nnnnn
{
\group_begin:
\char_set_catcode_other:N \#
\__emoji_def_aux:nnnnn
}
\cs_new_protected:Npn \__emoji_def_aux:nnnnn #1#2#3#4#5
{
\clist_map_inline:nn { #2, #3 }
{ \tl_const:cn { c__emoji_ ##1 _tl } {#1} }
\group_end:
}
% These two commands will be used in the documentation. Set to be empty
% commands as placeholders.
\cs_set:Npn \__emoji_group:n #1 {}
\cs_set:Npn \__emoji_subgroup:n #1 {}
% Input the emoji definition file.
% This file is generated by a Python scripts from Unicode and GitHub data.
\file_input:n { emoji-table.def }
% Compatibility with hyperref.
% `\emoji{...}` will be turned to a normal character sequence.
\AtBeginDocument
{
\@ifpackageloaded { hyperref }
{
\pdfstringdefDisableCommands
{
\cs_set_nopar:Npn \emoji #1
{ \tl_use:c { c__emoji_ #1 _tl } }
}
}
{}
}
\endinput
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