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|
-----------------------------------------------------------------------
-- FILE: luaotfload.lua
-- DESCRIPTION: OpenType layout system / luaotfload entry point
-- REQUIREMENTS: luatex v.0.95.0 or later; package lualibs
-- AUTHOR: Élie Roux, Khaled Hosny, Philipp Gesang, Ulrike Fischer, Marcel Krüger
-----------------------------------------------------------------------
local authors = "\z
Hans Hagen,\z
Khaled Hosny,\z
Elie Roux,\z
Will Robertson,\z
Philipp Gesang,\z
Dohyun Kim,\z
Reuben Thomas,\z
David Carlisle,\
Ulrike Fischer,\z
Marcel Krüger\z
"
-- version number is used below!
local ProvidesLuaModule = {
name = "luaotfload",
version = "3.28", --TAGVERSION
date = "2024-02-14", --TAGDATE
description = "Lua based OpenType font support",
author = authors,
copyright = authors,
license = "GPL v2.0"
}
if luatexbase and luatexbase.provides_module then
luatexbase.provides_module (ProvidesLuaModule)
end
if luaotfload_module == nil then
local print_warning = luatexbase and luatexbase.module_warning or function(module, text)
return texio.write_nl("%s WARNING: %s", module, text)
end
local saved_version = ProvidesLuaModule.version
local trace_submodules = tonumber(os.getenv'LUAOTFLOAD_TRACE_SUBMODULES')
if luatexbase and luatexbase.provides_module and trace_submodules and trace_submodules ~= 0 then
luaotfload_module = luatexbase.provides_module
else
function luaotfload_module(module)
local module_version = module.version
if module_version ~= saved_version then
local filenames
if debug then
filenames = string.format("luaotfload.lua is found at\n%q\n%s.lua is found at\n%q\n",
debug.getinfo(1, "S").source:sub(2),
module.name,
debug.getinfo(2, "S").source:sub(2))
else
filenames = ""
end
print_warning("luaotfload", string.format("Version inconsistency detected.\n\z
luaotfload is loaded in version %s, while %q is loaded \z
in version %s.\n%sI will try to continue anyway.\nHIC SUNT DRACONES",
saved_version, module.name, module_version, filenames))
end
end
end
else
error[[luaotfload is reloading itself nested. This can't happen.]]
end
local osgettimeofday = os.gettimeofday
config = config or { }
luaotfload = luaotfload or { }
local luaotfload = luaotfload
luaotfload.log = luaotfload.log or { }
local logreport
luaotfload.version = ProvidesLuaModule.version
luaotfload.loaders = { }
luaotfload.fontloader_package = "reference" --- default: from current Context
if not tex or not tex.luatexversion then
error "this program must be run in TeX mode" --- or call tex.initialize() =)
end
--- version check
local revno = tonumber(tex.luatexrevision)
local minimum = { 110, 0 }
if tex.luatexversion < minimum[1] or tex.luatexversion == minimum[1] and revno < minimum[2] then
texio.write_nl ("term and log",
string.format ("\tFATAL ERROR\n\z
\tLuaotfload requires a Luatex version >= %d.%d.%d.\n\z
\tPlease update your TeX distribution!\n\n",
math.floor(minimum[1] / 100), minimum[1] % 100, minimum[2]))
error "version check failed"
end
if not utf8 then
texio.write_nl("term and log", string.format("\z
\tluaotfload: module utf8 is unavailable\n\z
\tutf8 is available in Lua 5.3+; engine\'s _VERSION is %q\n\z
\tThis probably means that the engine is not supported\n\z
\n",
_VERSION))
error "module utf8 is unavailable"
end
if status.safer_option ~= 0 then
texio.write_nl("term and log","luaotfload can't run with option --safer. Aborting")
error("safer_option used")
end
--[[doc--
This file initializes the system and loads the font loader. To
minimize potential conflicts between other packages and the code
imported from \CONTEXT, several precautions are in order. Some of
the functionality that the font loader expects to be present, like
raw access to callbacks, are assumed to have been disabled by
\identifier{luatexbase} when this file is processed. In some cases
it is possible to trick it by putting dummies into place and
restoring the behavior from \identifier{luatexbase} after
initilization. Other cases such as attribute allocation require
that we hook the functionality from \identifier{luatexbase} into
locations where they normally wouldn’t be.
Anyways we can import the code base without modifications, which is
due mostly to the extra effort by Hans Hagen to make \LUATEX-Fonts
self-contained and encapsulate it, and especially due to his
willingness to incorporate our suggestions.
--doc]]--
local luatexbase = luatexbase
local require = require
local type = type
--[[doc--
\subsection{Module loading}
We load the files imported from \CONTEXT with function derived this way. It
automatically prepends a prefix to its argument, so we can refer to the
files with their actual \CONTEXT name.
--doc]]--
local function make_loader_name (prefix, name)
local msg = luaotfload.log and luaotfload.log.report
or function (stream, lvl, cat, ...)
if lvl > 1 then --[[not pressing]] return end
texio.write_nl ("log",
string.format ("luaotfload | %s : ",
tostring (cat)))
texio.write (string.format (...))
end
if not name then
msg ("both", 0, "load",
"Fatal error: make_loader_name (%q, %q).",
tostring (prefix), tostring (name))
return "dummy-name"
end
name = tostring (name)
if prefix == false then
msg ("log", 9, "load",
"No prefix requested, passing module name %q unmodified.",
name)
return tostring (name) .. ".lua"
end
prefix = tostring (prefix)
msg ("log", 9, "load",
"Composing module name from constituents %s, %s.",
prefix, name)
return prefix .. "-" .. name .. ".lua"
end
local function make_loader (prefix, load_helper)
return function (name)
local t_0 = osgettimeofday ()
local modname = make_loader_name (prefix, name)
--- We don’t want the stack info from inside, so just pcall().
local ok, data = pcall (load_helper or require, modname)
local t_end = osgettimeofday ()
if not ok then
io.write "\n"
local msg = luaotfload.log and luaotfload.log.report or print
msg ("both", 0, "load", "FATAL ERROR")
msg ("both", 0, "load", " × Failed to load %q module %q.",
tostring (prefix), tostring (name))
local lines = string.split (data, "\n\t")
if not lines then
msg ("both", 0, "load", " × Error message: %q", data)
else
msg ("both", 0, "load", " × Error message:")
for i = 1, #lines do
msg ("both", 0, "load", " × %q.", lines [i])
end
end
io.write "\n\n"
local debug = debug
if debug then
io.write (debug.traceback())
io.write "\n\n"
end
os.exit(-1)
end
return data
end
end
--[[doc--
Certain files are kept around that aren’t loaded because they are part of
the imported fontloader. In order to keep the initialization structure
intact we also provide a no-op version of the module loader that can be
called in the expected places.
--doc]]--
local function dummy_loader (name)
luaotfload.log.report ("log", 3, "load",
"Skipping module %q on purpose.",
name)
end
local context_environment = setmetatable({}, {__index = _G})
luaotfload.fontloader = context_environment
local function context_isolated_load(name)
local fullname = kpse.find_file(name, 'lua')
if not fullname then
error(string.format('Fontloader module %q could not be found.', name))
end
return assert(loadfile(fullname, nil, context_environment))(name)
end
local function context_loader (name, path)
luaotfload.log.report ("log", 3, "load",
"Loading module %q from Context.",
name)
local t_0 = osgettimeofday ()
local modname = make_loader_name (false, name)
local modpath = modname
if path then
if lfs.isdir (path) then
luaotfload.log.report ("log", 3, "load",
"Prepending path %q.",
path)
modpath = file.join (path, modname)
else
luaotfload.log.report ("both", 0, "load",
"Non-existant path %q specified, ignoring.",
path)
end
end
local ret = context_isolated_load (modpath)
local t_end = osgettimeofday ()
if ret ~= nil then
--- require () returns “true” upon success unless the loaded file
--- yields a non-zero exit code. This isn’t per se indicating that
--- something isn’t right, but against HH’s coding practices. We’ll
--- silently ignore this ever happening on lower log levels.
luaotfload.log.report ("log", 4, "load",
"Module %q returned %q.", modname, ret)
end
return ret
end
local function install_loaders ()
local loaders = { }
local loadmodule = make_loader "luaotfload"
loaders.luaotfload = loadmodule
loaders.fontloader = make_loader ("fontloader", context_isolated_load)
loaders.context = context_loader
loaders.ignore = dummy_loader
----loaders.plaintex = make_loader "luatex" --=> for Luatex-Plain
function loaders.initialize (name)
local tmp = loadmodule (name)
local init = type(tmp) == "table" and tmp.init or tmp
if init and type (init) == "function" then
local t_0 = osgettimeofday ()
if not init () then
logreport ("log", 0, "load",
"Failed to load module %q.", name)
return
end
local t_end = osgettimeofday ()
local d_t = t_end - t_0
logreport ("log", 4, "load",
"Module %q loaded in %g ms.",
name, d_t * 1000)
end
end
return loaders
end
local luaotfload_initialized = false --- prevent multiple invocations
luaotfload.main = function ()
if luaotfload_initialized then
logreport ("log", 0, "load",
"Luaotfload initialization requested but is already \z
loaded, ignoring.")
return
end
luaotfload_initialized = true
luaotfload.loaders = install_loaders ()
local loaders = luaotfload.loaders
local loadmodule = loaders.luaotfload
local initialize = loaders.initialize
local starttime = osgettimeofday ()
-- Feature detect HarfBuzz. This is done early to allow easy HarfBuzz
-- detection in other modules
local harfstatus, harfbuzz = pcall(require, 'luaharfbuzz')
if harfstatus then
luaotfload.harfbuzz = harfbuzz
end
local init = loadmodule "init" --- fontloader initialization
init (function ()
logreport = luaotfload.log.report
initialize "parsers" --- fonts.conf and syntax
initialize "configuration" --- configuration options
end)
initialize "loaders" --- Font loading; callbacks
initialize "database" --- Font management.
initialize "colors" --- Per-font colors.
local init_resolvers = loadmodule "resolvers" --- Font lookup
init_resolvers ()
if not config.actions.reconfigure () then
logreport ("log", 0, "load", "Post-configuration hooks failed.")
end
initialize "features" --- font request and feature handling
if harfstatus then
loadmodule "harf-define"
loadmodule "harf-plug"
end
loadmodule "letterspace" --- extra character kerning
loadmodule "embolden" --- fake bold
loadmodule "notdef" --- missing glyph handling
loadmodule "suppress" --- suppress ligatures by adding ZWNJ
loadmodule "szss" --- missing glyph handling
initialize "auxiliary" --- additional high-level functionality
loadmodule "tounicode"
loadmodule "case"
if tex.outputmode == 0 then
loadmodule "dvi" --- allow writing fonts to DVI files
end
luaotfload.aux.start_rewrite_fontname () --- to be migrated to fontspec
logreport ("log", 1, "main",
"initialization completed in %0.3f seconds\n",
osgettimeofday() - starttime)
luaotfload_module = nil
end
-- vim:tw=79:sw=4:ts=4:et
|