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|
% \iffalse meta-comment
%
%% File: l3luatex.dtx Copyright (C) 2010-2018 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{l3luatex} package: \LuaTeX-specific 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 2018-05-13}
%
% \maketitle
%
% \begin{documentation}
%
% The \LuaTeX{} engine provides access to the \Lua{} programming language,
% and with it access to the \enquote{internals} of \TeX{}. In order to use
% this within the framework provided here, a family of functions is
% available. When used with \pdfTeX{}, \pTeX{}, \upTeX{} or \XeTeX{} these raise an
% error: use \cs{sys_if_engine_luatex:T} to avoid this. Details on using
% \Lua{} with the \LuaTeX{} engine are given in the \LuaTeX{} manual.
%
% \section{Breaking out to \Lua{}}
%
% \begin{function}[EXP, added = 2015-06-29]{\lua_now_x:n, \lua_now:n}
% \begin{syntax}
% \cs{lua_now:n} \Arg{token list}
% \end{syntax}
% The \meta{token list} is first tokenized by \TeX{}, which includes
% converting line ends to spaces in the usual \TeX{} manner and which
% respects currently-applicable \TeX{} category codes. The resulting
% \meta{\Lua{} input} is passed to the \Lua{} interpreter for processing.
% Each \cs{lua_now:n} block is treated by \Lua{} as a separate chunk.
% The \Lua{} interpreter executes the \meta{\Lua{} input} immediately,
% and in an expandable manner.
%
% In the case of the \cs{lua_now_x:n} version the input is fully expanded
% by \TeX{} in an \texttt{x}-type manner \emph{but} the function remains
% fully expandable.
% \begin{texnote}
% \cs{lua_now_x:n} is a macro wrapper around \tn{directlua}: when
% \LuaTeX{} is in use two expansions are required to yield the
% result of the \Lua{} code.
% \end{texnote}
% \end{function}
%
% \begin{function}[added = 2015-06-30]{\lua_shipout_x:n, \lua_shipout:n}
% \begin{syntax}
% \cs{lua_shipout:n} \Arg{token list}
% \end{syntax}
% The \meta{token list} is first tokenized by \TeX{}, which includes
% converting line ends to spaces in the usual \TeX{} manner and which
% respects currently-applicable \TeX{} category codes. The resulting
% \meta{\Lua{} input} is passed to the \Lua{} interpreter when the
% current page is finalised (\emph{i.e.}~at shipout). Each
% \cs{lua_shipout:n} block is treated by \Lua{} as a separate chunk.
% The \Lua{} interpreter will execute the \meta{\Lua{} input} during the
% page-building routine: no \TeX{} expansion of the \meta{\Lua{} input}
% will occur at this stage.
%
% In the case of the \cs{lua_shipout_x:n} version the input is fully
% expanded by \TeX{} in an \texttt{x}-type manner during the shipout
% operation.
% \begin{texnote}
% At a \TeX{} level, the \meta{\Lua{} input} is stored as a
% \enquote{whatsit}.
% \end{texnote}
% \end{function}
%
% \begin{function}[EXP, added = 2015-06-29]{\lua_escape_x:n, \lua_escape:n}
% \begin{syntax}
% \cs{lua_escape:n} \Arg{token list}
% \end{syntax}
% Converts the \meta{token list} such that it can safely be passed to
% \Lua{}: embedded backslashes, double and single quotes, and newlines
% and carriage returns are escaped. This is done by prepending an extra
% token consisting of a backslash with category code~$12$, and for the line
% endings, converting them to |\n| and |\r|, respectively.
%
% In the case of the \cs{lua_escape_x:n} version the input is fully expanded
% by \TeX{} in an \texttt{x}-type manner \emph{but} the function remains
% fully expandable.
% \begin{texnote}
% \cs{lua_escape_x:n} is a macro wrapper around \tn{luaescapestring}:
% when \LuaTeX{} is in use two expansions are required to yield the
% result of the \Lua{} code.
% \end{texnote}
% \end{function}
%
% \section{Lua interfaces}
%
% As well as interfaces for \TeX{}, there are a small number of Lua functions
% provided here.
%
% \begin{function}{l3kernel}
% All public interfaces provided by the module are stored within the
% |l3kernel| table.
% \end{function}
%
% \begin{function}{l3kernel.charcat}
% \begin{syntax}
% |l3kernel.charcat||(|\meta{charcode}, \meta{catcode}|)|
% \end{syntax}
% Constructs a character of \meta{charcode} and \meta{catcode} and returns
% the result to \TeX{}.
% \end{function}
%
% \begin{function}{l3kernel.filemdfivesum}
% \begin{syntax}
% |l3kernel.filemdfivesum||(|\meta{file}|)|
% \end{syntax}
% Returns the of the MD5 sum of the file contents read as bytes; note that
% the result will depend on the nature of the line endings used in the file,
% in contrast to normal \TeX{} behaviour. If the \meta{file} is not found,
% nothing is returned with \emph{no error raised}.
% \end{function}
%
% \begin{function}{l3kernel.filemoddate}
% \begin{syntax}
% |l3kernel.filemoddate||(|\meta{file}|)|
% \end{syntax}
% Returns the of the date/time of last modification of the \meta{file} in the
% format
% \begin{quote}
% |D:|\meta{year}\meta{month}\meta{day}\meta{hour}\meta{minute}^^A
% \meta{second}\meta{offset}
% \end{quote}
% where the latter may be |Z| (UTC) or
% \meta{plus-minus}\meta{hours}|'|\meta{minutes}|'|. If the \meta{file} is
% not found, nothing is returned with \emph{no error raised}.
% \end{function}
%
% \begin{function}{l3kernel.filesize}
% \begin{syntax}
% |l3kernel.filesize||(|\meta{file}|)|
% \end{syntax}
% Returns the size of the \meta{file} in bytes. If the \meta{file} is not
% found, nothing is returned with \emph{no error raised}.
% \end{function}
%
% \begin{function}{l3kernel.strcmp}
% \begin{syntax}
% |l3kernel.strcmp||(|\meta{str one}, \meta{str two}|)|
% \end{syntax}
% Compares the two strings and returns |0| to \TeX{}
% if the two are identical.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3luatex} implementation}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \subsection{Breaking out to \Lua{}}
%
% \begin{macrocode}
%<*tex>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=luatex>
% \end{macrocode}
%
% \begin{macro}[EXP]{\@@_escape_x:n, \@@_now_x:n, \@@_shipout_x:n}
% Copies of primitives.
% \begin{macrocode}
\cs_new_eq:NN \@@_escape_x:n \tex_luaescapestring:D
\cs_new_eq:NN \@@_now_x:n \tex_directlua:D
\cs_new_eq:NN \@@_shipout_x:n \tex_latelua:D
% \end{macrocode}
% \end{macro}
%
% These functions are set up in \pkg{l3str} for bootstrapping: we want to
% replace them with a \enquote{proper} version at this stage, so clean up.
% \begin{macrocode}
\cs_undefine:N \lua_escape_x:n
\cs_undefine:N \lua_now_x:n
% \end{macrocode}
%
% \begin{macro}[EXP]{\lua_now_x:n, \lua_now:n}
% \begin{macro}{\lua_shipout_x:n, \lua_shipout:n}
% \begin{macro}[EXP]{\lua_escape_x:n, \lua_escape:n}
% Wrappers around the primitives. As with engines other than \LuaTeX{}
% these have to be macros, we give them the same status in all cases.
% When \LuaTeX{} is not in use, simply give an error message/
% \begin{macrocode}
\cs_new:Npn \lua_now_x:n #1 { \@@_now_x:n {#1} }
\cs_new:Npn \lua_now:n #1 { \lua_now_x:n { \exp_not:n {#1} } }
\cs_new_protected:Npn \lua_shipout_x:n #1 { \@@_shiphout_x:n {#1} }
\cs_new_protected:Npn \lua_shipout:n #1
{ \lua_shipout_x:n { \exp_not:n {#1} } }
\cs_new:Npn \lua_escape_x:n #1 { \@@_escape_x:n {#1} }
\cs_new:Npn \lua_escape:n #1 { \lua_escape_x:n { \exp_not:n {#1} } }
\sys_if_engine_luatex:F
{
\clist_map_inline:nn
{
\use_x:n ,
\lua_escape_x:n , \lua_escape:n ,
\lua_now_x:n , \lua_now:n
}
{
\cs_set:Npn #1 ##1
{
\__kernel_msg_expandable_error:nnn
{ kernel } { luatex-required } { #1 }
}
}
\clist_map_inline:nn
{ \lua_shipout_x:n , \lua_shipout:n }
{
\cs_set_protected:Npn #1 ##1
{
\__kernel_msg_error:nnn
{ kernel } { luatex-required } { #1 }
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsection{Messages}
%
% \begin{macrocode}
\__kernel_msg_new:nnnn { kernel } { luatex-required }
{ LuaTeX~engine~not~in~use!~Ignoring~#1. }
{
The~feature~you~are~using~is~only~available~
with~the~LuaTeX~engine.~LaTeX3~ignored~'#1'.
}
% \end{macrocode}
%
% \begin{macrocode}
%</tex>
% \end{macrocode}
%
% \subsection{\Lua{} functions for internal use}
%
% \begin{macrocode}
%<*lua>
% \end{macrocode}
%
% Most of the emulation of \pdfTeX{} here is based heavily on Heiko Oberdiek's
% \pkg{pdftexcmds} package.
%
% \begin{macro}{l3kernel}
% Create a table for the kernel's own use.
% \begin{macrocode}
l3kernel = l3kernel or { }
% \end{macrocode}
% \end{macro}
%
% Local copies of global tables.
% \begin{macrocode}
local io = io
local kpse = kpse
local lfs = lfs
local math = math
local md5 = md5
local os = os
local string = string
local tex = tex
local unicode = unicode
% \end{macrocode}
%
% Local copies of standard functions.
% \begin{macrocode}
local abs = math.abs
local byte = string.byte
local floor = math.floor
local format = string.format
local gsub = string.gsub
local kpse_find = kpse.find_file
local lfs_attr = lfs.attributes
local md5_sum = md5.sum
local open = io.open
local os_date = os.date
local setcatcode = tex.setcatcode
local str_format = string.format
local sprint = tex.sprint
local write = tex.write
local utf8_char = unicode.utf8.char
% \end{macrocode}
%
% \begin{macro}[int]{escapehex}
% An internal auxiliary to convert a string to the matching hex escape.
% This works on a byte basis: extension to handled UTF-8 input is
% covered in \pkg{pdftexcmds} but is not currently required here.
% \begin{macrocode}
local function escapehex(str)
write((gsub(str, ".",
function (ch) return format("%02X", byte(ch)) end)))
end
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.charcat}
% Creating arbitrary chars needs a category code table. As set up here,
% one may have been assigned earlier (see \pkg{l3bootstrap}) or a hard-coded
% one is used. The latter is intended for format mode and should be adjusted
% to match an eventual allocator.
% \begin{macrocode}
local charcat_table = l3kernel.charcat_table or 1
local function charcat(charcode, catcode)
setcatcode(charcat_table, charcode, catcode)
sprint(charcat_table, utf8_char(charcode))
end
l3kernel.charcat = charcat
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.filemdfivesum}
% Read an entire file and hash it: the hash function itself is a built-in.
% As Lua is byte-based there is no work needed here in terms of UTF-8
% (see \pkg{pdftexcmds} and how it handles strings that have passed through
% \LuaTeX{}). The file is read in binary mode so that no line ending
% normalisation occurs.
% \begin{macrocode}
local function filemdfivesum(name)
local file = kpse_find(name, "tex", true)
if file then
local f = open(file, "rb")
if f then
local data = f:read("*a")
escapehex(md5_sum(data))
f:close()
end
end
end
l3kernel.filemdfivesum = filemdfivesum
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.filemoddate}
% See procedure \texttt{makepdftime} in \texttt{utils.c} of
% \pdfTeX{}.
% \begin{macrocode}
local function filemoddate(name)
local file = kpse_find(name, "tex", true)
if file then
local date = lfs_attr(file, "modification")
if date then
local d = os_date("*t", date)
if d.sec >= 60 then
d.sec = 59
end
local u = os_date("!*t", date)
local off = 60 * (d.hour - u.hour) + d.min - u.min
if d.year ~= u.year then
if d.year > u.year then
off = off + 1440
else
off = off - 1440
end
elseif d.yday ~= u.yday then
if d.yday > u.yday then
off = off + 1440
else
off = off - 1440
end
end
local timezone
if off == 0 then
timezone = "Z"
else
local hours = floor(off / 60)
local mins = abs(off - hours * 60)
timezone = str_format("%+03d", hours)
.. "'" .. str_format("%02d", mins) .. "'"
end
write("D:"
.. str_format("%04d", d.year)
.. str_format("%02d", d.month)
.. str_format("%02d", d.day)
.. str_format("%02d", d.hour)
.. str_format("%02d", d.min)
.. str_format("%02d", d.sec)
.. timezone)
end
end
end
l3kernel.filemoddate = filemoddate
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.filesize}
% A simple disk lookup.
% \begin{macrocode}
local function filesize(name)
local file = kpse_find(name, "tex", true)
if file then
local size = lfs_attr(file, "size")
if size then
write(size)
end
end
end
l3kernel.filesize = filesize
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{l3kernel.strcmp}
% String comparison which gives the same results as \pdfTeX{}'s
% \tn{pdfstrcmp}, although the ordering should likely not be relied upon!
% \begin{macrocode}
local function strcmp(A, B)
if A == B then
write("0")
elseif A < B then
write("-1")
else
write("1")
end
end
l3kernel.strcmp = strcmp
% \end{macrocode}
% \end{macro}
%
% \subsection{Generic \Lua{} and font support}
%
% \begin{macrocode}
%<*initex>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=alloc>
% \end{macrocode}
%
% A small amount of generic code is used by almost all \LuaTeX{} material so
% needs to be loaded by the format.
% \begin{macrocode}
attribute_count_name = "g_@@_attribute_int"
bytecode_count_name = "g_@@_bytecode_int"
chunkname_count_name = "g_@@_chunkname_int"
whatsit_count_name = "g_@@_whatsit_int"
require("ltluatex")
% \end{macrocode}
%
% With the above available the font loader code used by plain \TeX{} and
% \LaTeXe{} when used with \LuaTeX{} can be loaded here. This is thus being
% treated more-or-less as part of the engine itself.
% \begin{macrocode}
require("luaotfload-main")
local _void = luaotfload.main()
% \end{macrocode}
% \begin{macrocode}
%</initex>
% \end{macrocode}
%
% \begin{macrocode}
%</lua>
% \end{macrocode}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
%\end{implementation}
%
%\PrintIndex
|