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#!/usr/bin/env texlua
-----------------------------------------------------------------------
-- FILE: luaotfload-init.lua
-- DESCRIPTION: Luaotfload font loader initialization
-- REQUIREMENTS: luatex v.0.80 or later; packages lualibs, luatexbase
-- AUTHOR: Philipp Gesang (Phg), <phg@phi-gamma.net>
-- VERSION: 1.0
-- CREATED: 2015-05-26 07:50:54+0200
-----------------------------------------------------------------------
--
--[[doc--
Initialization phases:
- Load Lualibs from package
- Set up the logger routines
- Load Fontloader
- as package specified in configuration
- from Context install
- (optional: from raw unpackaged files distributed with
Luaotfload)
The initialization of the Lualibs may be made configurable in the
future as well allowing to load both the files and the merged package
depending on a configuration setting. However, this would require
separating out the configuration parser into a self-contained
package, which might be problematic due to its current dependency on
the Lualibs itself.
--doc]]--
config = config or { }
local config = config
config.luaotfload = config.luaotfload or { }
config.lualibs = config.lualibs or { }
config.lualibs.verbose = false
config.lualibs.prefer_merged = true
config.lualibs.load_extended = true
require "lualibs"
if not lualibs then error("this module requires Luaotfload") end
if not luaotfload then error("this module requires Luaotfload") end
local load_luaotfload_module = luaotfload.loaders.luaotfload
local load_fontloader_module = luaotfload.loaders.fontloader
--[[doc--
The logger needs to be in place prior to loading the fontloader due
to order of initialization being crucial for the logger functions
that are swapped.
--doc]]--
load_luaotfload_module "log"
local log = luaotfload.log
local logreport = log.report
log.set_loglevel (default_log_level)
--[[doc--
\subsection{Preparing the Font Loader}
We treat the fontloader as a black box so behavior is consistent
between formats.
We load the fontloader code directly in the same fashion as the
Plain format \identifier{luatex-fonts} that is part of Context.
How this is executed depends on the presence on the
\emphasis{merged font loader code}.
In \identifier{luaotfload} this is contained in the file
\fileent{luaotfload-merged.lua}.
If this file cannot be found, the original libraries from \CONTEXT
of which the merged code was composed are loaded instead.
Since these files are not shipped with Luaotfload, an installation
of Context is required.
(Since we pull the fontloader directly from the Context minimals,
the necessary Context version is likely to be more recent than that
of other TeX distributions like Texlive.)
The imported font loader will call \luafunction{callback.register}
once while reading \fileent{font-def.lua}.
This is unavoidable unless we modify the imported files, but
harmless if we make it call a dummy instead.
However, this problem might vanish if we decide to do the merging
ourselves, like the \identifier{lualibs} package does.
With this step we would obtain the freedom to load our own
overrides in the process right where they are needed, at the cost
of losing encapsulation.
The decision on how to progress is currently on indefinite hold.
--doc]]--
local starttime = os.gettimeofday ()
local trapped_register = callback.register
callback.register = function (id)
logreport ("log", 4, "init",
"Dummy callback.register() invoked on %s.",
id)
end
--[[doc--
By default, the fontloader requires a number of \emphasis{private
attributes} for internal use.
These must be kept consistent with the attribute handling methods
as provided by \identifier{luatexbase}.
Our strategy is to override the function that allocates new
attributes before we initialize the font loader, making it a
wrapper around \luafunction{luatexbase.new_attribute}.\footnote{%
Many thanks, again, to Hans Hagen for making this part
configurable!
}
The attribute identifiers are prefixed “\fileent{luaotfload@}” to
avoid name clashes.
--doc]]--
do
local new_attribute = luatexbase.new_attribute
local the_attributes = luatexbase.attributes
attributes = attributes or { }
attributes.private = function (name)
local attr = "luaotfload@" .. name --- used to be: “otfl@”
local number = the_attributes[attr]
if not number then
number = new_attribute(attr)
end
return number
end
end
--[[doc--
These next lines replicate the behavior of
\fileent{luatex-fonts.lua}.
--doc]]--
local context_environment = { }
local push_namespaces = function ()
logreport ("log", 4, "init", "push namespace for font loader")
local normalglobal = { }
for k, v in next, _G do
normalglobal[k] = v
end
return normalglobal
end
local pop_namespaces = function (normalglobal, isolate)
if normalglobal then
local _G = _G
local mode = "non-destructive"
if isolate then mode = "destructive" end
logreport ("log", 4, "init", "pop namespace from font loader -- " .. mode)
for k, v in next, _G do
if not normalglobal[k] then
context_environment[k] = v
if isolate then
_G[k] = nil
end
end
end
for k, v in next, normalglobal do
_G[k] = v
end
-- just to be sure:
setmetatable(context_environment,_G)
else
logreport ("both", 0, "init",
"irrecoverable error during pop_namespace: no globals to restore")
os.exit()
end
end
luaotfload.context_environment = context_environment
luaotfload.push_namespaces = push_namespaces
luaotfload.pop_namespaces = pop_namespaces
local our_environment = push_namespaces()
--[[doc--
The font loader requires that the attribute with index zero be
zero. We happily oblige.
(Cf. \fileent{luatex-fonts-nod.lua}.)
--doc]]--
tex.attribute[0] = 0
--[[doc--
Now that things are sorted out we can finally load the fontloader.
For less current distibutions we ship the code from TL 2014 that should be
compatible with Luatex 0.76.
--doc]]--
load_fontloader_module (luaotfload.fontloader_package)
---load_fontloader_module "font-odv.lua" --- <= Devanagari support from Context
if fonts then
--- The Initialization is highly idiosyncratic.
if not fonts._merge_loaded_message_done_ then
logreport ("log", 5, "init", [["I am using the merged fontloader here.]])
logreport ("log", 5, "init", [[ If you run into problems or experience unexpected]])
logreport ("log", 5, "init", [[ behaviour, and if you have ConTeXt installed you can try]])
logreport ("log", 5, "init", [[ to delete the file 'fontloader-fontloader.lua' as I might]])
logreport ("log", 5, "init", [[ then use the possibly updated libraries. The merged]])
logreport ("log", 5, "init", [[ version is not supported as it is a frozen instance.]])
logreport ("log", 5, "init", [[ Problems can be reported to the ConTeXt mailing list."]])
end
fonts._merge_loaded_message_done_ = true
else--- the loading sequence is known to change, so this might have to
--- be updated with future updates!
--- do not modify it though unless there is a change to the merged
--- package!
load_fontloader_module "l-lua"
load_fontloader_module "l-lpeg"
load_fontloader_module "l-function"
load_fontloader_module "l-string"
load_fontloader_module "l-table"
load_fontloader_module "l-io"
load_fontloader_module "l-file"
load_fontloader_module "l-boolean"
load_fontloader_module "l-math"
load_fontloader_module "util-str"
load_fontloader_module "luatex-basics-gen"
load_fontloader_module "data-con"
load_fontloader_module "luatex-basics-nod"
load_fontloader_module "font-ini"
load_fontloader_module "font-con"
load_fontloader_module "luatex-fonts-enc"
load_fontloader_module "font-cid"
load_fontloader_module "font-map"
load_fontloader_module "luatex-fonts-syn"
load_fontloader_module "luatex-fonts-tfm"
load_fontloader_module "font-oti"
load_fontloader_module "font-otf"
load_fontloader_module "font-otb"
load_fontloader_module "luatex-fonts-inj" --> since 2014-01-07, replaces node-inj.lua
load_fontloader_module "luatex-fonts-ota"
load_fontloader_module "luatex-fonts-otn" --> since 2014-01-07, replaces font-otn.lua
load_fontloader_module "font-otp" --> since 2013-04-23
load_fontloader_module "luatex-fonts-lua"
load_fontloader_module "font-def"
load_fontloader_module "luatex-fonts-def"
load_fontloader_module "luatex-fonts-ext"
load_fontloader_module "luatex-fonts-cbk"
end --- non-merge fallback scope
local init_cleanup = function ()
--- reinstate all the stuff we had to move out of the way to
--- accomodate the loader
--[[doc--
Here we adjust the globals created during font loader
initialization. If the second argument to
\luafunction{pop_namespaces()} is \verb|true| this will restore the
state of \luafunction{_G}, eliminating every global generated since
the last call to \luafunction{push_namespaces()}. At the moment we
see no reason to do this, and since the font loader is considered
an essential part of \identifier{luatex} as well as a very well
organized piece of code, we happily concede it the right to add to
\luafunction{_G} if needed.
--doc]]--
pop_namespaces(our_environment, false)-- true)
--[[doc--
\subsection{Callbacks}
After the fontloader is ready we can restore the callback trap
from \identifier{luatexbase}.
--doc]]--
callback.register = trapped_register
end --- [init_cleanup]
local init_post = function ()
--- hook for actions that need to take place after the fontloader is
--- installed
--[[doc--
we do our own callback handling with the means provided by
luatexbase.
note: \luafunction{pre_linebreak_filter} and
\luafunction{hpack_filter} are coupled in \context in the
concept of \emphasis{node processor}.
--doc]]--
luatexbase.add_to_callback("pre_linebreak_filter",
nodes.simple_font_handler,
"luaotfload.node_processor",
1)
luatexbase.add_to_callback("hpack_filter",
nodes.simple_font_handler,
"luaotfload.node_processor",
1)
end --- [init_post]
return {
init = function ()
init_prepare ()
init_main ()
init_cleanup ()
logreport ("both", 1, "init",
"fontloader loaded in %0.3f seconds",
os.gettimeofday()-starttime)
init_post ()
end
}
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