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#!/usr/bin/env texlua
-----------------------------------------------------------------------
-- FILE: luaotfload-loaders.lua
-- DESCRIPTION: Luaotfload callback handling
-- REQUIREMENTS: luatex v.0.80 or later; package lualibs
-- AUTHOR: Philipp Gesang <phg@phi-gamma.net>
-- AUTHOR: Hans Hagen, Khaled Hosny, Elie Roux, David Carlisle
-----------------------------------------------------------------------
--
--- Contains parts of the earlier main script.
if not lualibs then error "this module requires Luaotfload" end
if not luaotfload then error "this module requires Luaotfload" end
local logreport = luaotfload.log and luaotfload.log.report or print
local lua_reader = function (specification)
local fullname = specification.filename or ""
if fullname == "" then
local forced = specification.forced or ""
if forced ~= "" then
fullname = specification.name .. "." .. forced
else
fullname = specification.name
end
end
local fullname = resolvers.findfile (fullname) or ""
if fullname ~= "" then
local loader = loadfile (fullname)
loader = loader and loader ()
return loader and loader (specification)
end
end
local eval_reader = function (specification)
local eval = specification.eval
if not eval or type (eval) ~= "function" then return nil end
logreport ("both", 0, "loaders",
"eval: found tfmdata for “%s”, injecting.",
specification.name)
return eval ()
end
local install_formats = function ()
local fonts = fonts
if not fonts then return false end
local readers = fonts.readers
local sequence = readers.sequence
local seqset = table.tohash (sequence)
local handlers = fonts.handlers
local formats = fonts.formats
if not readers or not handlers or not formats then return false end
local aux = function (which, reader)
if not which or type (which) ~= "string"
or not reader or type (reader) ~= "function" then
logreport ("both", 2, "loaders", "Error installing reader for “%s”.", which)
return false
end
formats [which] = "type1"
readers [which] = reader
handlers [which] = { }
if not seqset [which] then
logreport ("both", 0, "loaders",
"Extending reader sequence for “%s”.", which)
sequence [#sequence + 1] = which
seqset [which] = true
end
return true
end
return aux ("evl", eval_reader)
and aux ("lua", lua_reader)
and aux ("pfa", function (spec) return readers.opentype (spec, "pfa", "type1") end)
and aux ("pfb", function (spec) return readers.opentype (spec, "pfb", "type1") end)
and aux ("ofm", readers.tfm)
end
--[[doc--
\subsection{\CONTEXT override}
\label{define-font}
We provide a simplified version of the original font definition
callback.
--doc]]--
local definers --- (string, spec -> size -> id -> tmfdata) hash_t
do
local read = fonts.definers.read
local patch = function (specification, size, id)
local fontdata = read (specification, size, id)
if type (fontdata) == "table" and fontdata.shared then
--- We need to test for the “shared” field here
--- or else the fontspec capheight callback will
--- operate on tfm fonts.
luatexbase.call_callback ("luaotfload.patch_font", fontdata, specification)
else
luatexbase.call_callback ("luaotfload.patch_font_unsafe", fontdata, specification)
end
return fontdata
end
local mk_info = function (name)
local definer = name == "patch" and patch or read
return function (specification, size, id)
logreport ("both", 0, "loaders", "defining font no. %d", id)
logreport ("both", 0, "loaders", " > active font definer: %q", name)
logreport ("both", 0, "loaders", " > spec %q", specification)
logreport ("both", 0, "loaders", " > at size %.2f pt", size / 2^16)
local result = definer (specification, size, id)
if not result then
logreport ("both", 0, "loaders", " > font definition failed")
return
elseif type (result) == "number" then
logreport ("both", 0, "loaders", " > font definition yielded id %d", result)
return result
end
logreport ("both", 0, "loaders", " > font definition successful")
logreport ("both", 0, "loaders", " > name %q", result.name or "<nil>")
logreport ("both", 0, "loaders", " > fontname %q", result.fontname or "<nil>")
logreport ("both", 0, "loaders", " > fullname %q", result.fullname or "<nil>")
logreport ("both", 0, "loaders", " > type %s", result.type or "<nil>")
return result
end
end
definers = {
patch = patch,
generic = read,
info_patch = mk_info "patch",
info_generic = mk_info "generic",
}
end
--[[doc--
We create callbacks for patching fonts on the fly, to be used by
other packages. In addition to the regular \identifier{patch_font}
callback there is an unsafe variant \identifier{patch_font_unsafe}
that will be invoked even if the target font lacks certain essential
tfmdata tables.
The callbacks initially contain the empty function that we are going
to override below.
--doc]]--
local purge_define_font = function ()
local cdesc = luatexbase.callback_descriptions "define_font"
--- define_font is an “exclusive” callback, meaning that there can
--- only ever be one entry. Everything beyond that would indicate
--- that something is broken.
local _, d = next (cdesc)
if d then
local i, d2 = next (cdesc, 1)
if d2 then --> issue warning
logreport ("both", 0, "loaders",
"Callback table for define_font contains multiple entries: \z
{ [%d] = “%s” } -- seems fishy.", i, d2)
end
logreport ("log", 0, "loaders",
"Entry ``%s`` present in define_font callback; overriding.", d)
luatexbase.remove_from_callback ("define_font", d)
end
end
local install_callbacks = function ()
local create_callback = luatexbase.create_callback
local dummy_function = function () end
create_callback ("luaotfload.patch_font", "simple", dummy_function)
create_callback ("luaotfload.patch_font_unsafe", "simple", dummy_function)
purge_define_font ()
local definer = config.luaotfload.run.definer
luatexbase.add_to_callback ("define_font",
definers[definer or "patch"],
"luaotfload.define_font",
1)
return true
end
return {
init = function ()
local ret = true
if not install_formats () then
logreport ("log", 0, "loaders", "Error initializing OFM/PF{A,B} loaders.")
ret = false
end
if not install_callbacks () then
logreport ("log", 0, "loaders", "Error installing font loader callbacks.")
ret = false
end
return ret
end
}
-- vim:tw=79:sw=2:ts=2:expandtab
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