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|
--
-- This is file `luaotfload.lua',
-- generated with the docstrip utility.
--
-- The original source files were:
--
-- luaotfload.dtx (with options: `lua')
-- This is a generated file.
--
-- Copyright (C) 2009-2010 by by Elie Roux <elie.roux@telecom-bretagne.eu>
-- and Khaled Hosny <khaledhosny@eglug.org>
-- (Support: <lualatex-dev@tug.org>.)
--
-- This work is under the CC0 license.
--
-- This work consists of the main source file luaotfload.dtx
-- and the derived files
-- luaotfload.sty, luaotfload.lua
--
module("luaotfload", package.seeall)
luaotfload.module = {
name = "luaotfload",
version = 1.27,
date = "2012/05/28",
description = "OpenType layout system.",
author = "Elie Roux & Hans Hagen",
copyright = "Elie Roux",
license = "CC0"
}
local luatexbase = luatexbase
local type, next, dofile = type, next, dofile
local stringfind = string.find
local add_to_callback, create_callback =
luatexbase.add_to_callback, luatexbase.create_callback
local reset_callback, call_callback =
luatexbase.reset_callback, luatexbase.call_callback
local dummy_function = function () end
--[[doc--
No final decision has been made on how to handle font definition.
At the moment, there are three candidates: The \textsf{generic}
callback as hard-coded in the font loader, the \textsf{old} wrapper,
and a simplified version of the latter (\textsf{patch}) that does
nothing besides applying font patches.
--doc]]--
luaotfload.font_definer = "patch" --- | “generic” | “old”
local fl_prefix = "otfl" -- “luatex” for luatex-plain
local error, warning, info, log = luatexbase.provides_module(luaotfload.module)
local luatex_version = 75
if tex.luatexversion < luatex_version then
warning("LuaTeX v%.2f is old, v%.2f is recommended.",
tex.luatexversion/100,
luatex_version /100)
end
local loadmodule = function (name)
local tofind = fl_prefix .."-"..name
local found = kpse.find_file(tofind,"tex")
if found then
log("loading file %s.", found)
dofile(found)
else
--error("file %s not found.", tofind)
error("file %s not found.", tofind)
end
end
--[[-- keep --]]
--- from Hans (all merged):
--- file name modified include name
--- × basics-gen.lua t luat-basics-gen
--- × font-def -> fonts-def t luatex-font-def (there’s also the normal font-def!)
--- × fonts-enc f luatex-font-enc
--- × fonts-ext t luatex-fonts-ext
--- × fonts-lua f luatex-fonts-lua
--- fonts-tfm f luatex-fonts-tfm
--- × fonts-cbk f luatex-fonts-lua
--- from Hans (unmerged):
--- font-otc.lua -> otfl-font-otc.lua
--- from luaotfload:
--- otfl-luat-ovr.lua -- override some luat-dum functions
--- otfl-font-clr.lua
--- otfl-font-ltx.lua
--- otfl-font-nms.lua
--- otfl-font-pfb.lua -- ?
--[[-- new --]]
--- basics-nod (merged as fonts-nod !)
--- fonts-demo-vf-1.lua
--- fonts-syn (merged)
--[[-- merged, to be dropped --]]
--- otfl-data-con.lua
--- otfl-font-cid.lua
--- otfl-font-con.lua
--- otfl-font-ini.lua
--- otfl-font-ota.lua
--- otfl-font-otb.lua
--- otfl-font-otf.lua
--- otfl-font-oti.lua
--- otfl-font-otn.lua
--[[--
it all boils down to this: we load otfl-fonts.lua
which takes care of loading the merged file.
that’s it, go thank Hans!
--]]--
--[[doc--
We treat the fontloader as a black box so behavior is consistent
between formats.
The wrapper file is |otfl-fonts.lua| which we imported from
\LUATEX-Plain.
It has roughly two purposes:
(\textit{1}) insert the functionality required for fontloader, and
(\textit{2}) put it in place via the respective callbacks.
How the first step is executed depends on the presence on the
\emph{merged font loader code}.
In \textsf{luaotfload} this is contained in the file
|otfl-fonts-merged.lua|.
If this file cannot be found, the original libraries from \CONTEXT of
which the merged code was composed are loaded instead.
Hans provides two global tables to control the font loader:
\begin{tabular}{ll}
\texttt{generic\textunderscore context} &
encapsulation mechanism, callback functions
\\
\texttt{non\textunderscore generic\textunderscore context} &
customized code insertion
\\
\end{tabular}
With \verb|non_generic_context| we can tailor the font loader insertion
to our file naming habits (key \verb|load_before|).
Additionally, \verb|skip_loading| can be unset to force loading of
the original libraries as though the merged code was absent.
Another key, \verb|load_after| is called at the time when the font
loader is actually inserted.
In combination with the option \verb|no_callbacks_yet| in
\verb|generic_context|, we can insert our own,
\textsf{luatexbase}-style callback handling here.
--doc]]--
if not _G. generic_context then _G. generic_context = { } end
if not _G.non_generic_context then _G.non_generic_context = { } end
local generic_context = generic_context
local non_generic_context =non_generic_context
generic_context.no_callbacks_yet = true
_G.non_generic_context = { luatex_fonts = {
load_before = "otfl-fonts-merged.lua",
-- load_after = nil, --- TODO, this is meant for callbacks
skip_loading = true,
}}
--[[doc--
The imported font loader will call \verb|callback.register| once
(during \verb|font-def.lua|).
This is unavoidable but harmless, so we make it call a dummy instead.
--doc]]--
local trapped_register = callback.register
callback.register = dummy_function
--[[doc--
Now that things are sorted out we can load the fontloader.
--doc]]--
loadmodule"fonts.lua"
--[[doc--
After the fontloader is ready we can restore the callback trap from
\textsf{luatexbase}.
--doc]]--
callback.register = trapped_register
--[[doc--
We do our own callback handling with the means provided by luatexbase.
Note: \verb|pre_linebreak_filter| and \verb|hpack_filter| are coupled
in \CONTEXT\ in the concept of \emph{node processor}.
--doc]]--
add_to_callback("pre_linebreak_filter",
generic_context.callback_pre_linebreak_filter,
"luaotfload.node_processor",
1)
add_to_callback("hpack_filter",
generic_context.callback_hpack_filter,
"luaotfload.node_processor",
1)
loadmodule"font-otc.lua" -- TODO check what we can drop from otfl-features
loadmodule"lib-dir.lua" -- required by font-nms; will change with lualibs update
loadmodule"luat-ovr.lua"
loadmodule"font-nms.lua"
loadmodule"font-clr.lua"
loadmodule"font-ltx.lua"
create_callback("luaotfload.patch_font", "simple", dummy_function)
--[[doc--
This is a wrapper for the imported font loader.
As of 2013, everything it does appears to be redundand, so we won’t use
it.
Nevertheless, it has been adapted to work with the current structure of
font data objects and will stay here for reference / until somebody
reports breakage.
TODO
This one also enables patching fonts.
The current fontloader apparently comes with a dedicated mechanism for
that already: enhancers.
How those work remains to be figured out.
--doc]]--
local define_font_wrapper = function (...)
--- we use “tfmdata” (not “fontdata”) for consistency with the
--- font loader
local tfmdata = fonts.definers.read(...)
if type(tfmdata) == "table" and tfmdata.shared then
local metadata = tfmdata.shared.rawdata.metadata
local mathdata = metadata.math --- do all fonts have this field?
if mathdata then
local mathconstants = { } --- why new hash, not modify in place?
local units_per_em = metadata.units_per_em
local size = tfmdata.size
for k,v in next, mathdata do
--- afaics this is alread taken care of by
--- definers.read
if stringfind(k, "Percent") then
-- keep percent values as is
print(k,v)
mathconstants[k] = v
else
mathconstants[k] = v / units_per_em * size
end
end
--- for \overwithdelims
--- done by definers.read as well
mathconstants.FractionDelimiterSize = 1.01 * size
--- fontloader has 2.4 × size
mathconstants.FractionDelimiterDisplayStyleSize = 2.39 * size
tfmdata.MathConstants = mathconstants
end
call_callback("luaotfload.patch_font", tfmdata)
end
return tfmdata
end
--[[doc--
We provide a simplified version of the original font definition
callback.
--doc]]--
local patch_defined_font = function (...)
local tfmdata = fonts.definers.read(...)
if type(tfmdata) == "table" then
call_callback("luaotfload.patch_font", tfmdata)
end
--inspect(tfmdata.shared.features)
return tfmdata
end
fonts.mode = "node"
caches.compilemethod = "both"
function attributes.private(name)
local attr = "otfl@" .. name
local number = luatexbase.attributes[attr]
if not number then
number = luatexbase.new_attribute(attr)
end
return number
end
reset_callback("define_font")
if luaotfload.font_definer == "old" then
add_to_callback("define_font",
old_define_font_wrapper,
"luaotfload.define_font",
1)
elseif luaotfload.font_definer == "generic" then
add_to_callback("define_font",
generic_context.callback_define_font,
"luaotfload.define_font",
1)
elseif luaotfload.font_definer == "patch" then
add_to_callback("define_font",
patch_defined_font,
"luaotfload.define_font",
1)
end
loadmodule"features.lua"
--[==[
---- is this still necessary?
local set_sscale_diments = function (tfmdata)
local mathconstants = tfmdata.MathConstants
if mathconstants then
local tfmparameters = tfmdata.parameters
if mathconstants.ScriptPercentScaleDown then
tfmparameters[10] = mathconstants.ScriptPercentScaleDown
else -- resort to plain TeX default
tfmparameters[10] = 70
end
if mathconstants.ScriptScriptPercentScaleDown then
tfmparameters[11] = mathconstants.ScriptScriptPercentScaleDown
else -- resort to plain TeX default
tfmparameters[11] = 50
end
end
end
add_to_callback("luaotfload.patch_font",
set_sscale_diments,
"unicodemath.set_sscale_diments")
]==]
-- vim:tw=71:sw=2:ts=2:expandtab
-- End of File `luaotfload.lua'.
|