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-rw-r--r--src/luaotfload-loaders.lua147
1 files changed, 120 insertions, 27 deletions
diff --git a/src/luaotfload-loaders.lua b/src/luaotfload-loaders.lua
index 901d4d8..061789c 100644
--- a/src/luaotfload-loaders.lua
+++ b/src/luaotfload-loaders.lua
@@ -1,34 +1,127 @@
-if not modules then modules = { } end modules ["loaders"] = {
- version = "2.5",
- comment = "companion to luaotfload-main.lua",
- author = "Hans Hagen, Khaled Hosny, Elie Roux, Philipp Gesang",
- copyright = "PRAGMA ADE / ConTeXt Development Team",
- license = "see context related readme files"
-}
+#!/usr/bin/env texlua
+-----------------------------------------------------------------------
+-- FILE: luaotfload-loaders.lua
+-- DESCRIPTION: Luaotfload callback handling
+-- REQUIREMENTS: luatex v.0.80 or later; packages lualibs, luatexbase
+-- AUTHOR: Philipp Gesang (Phg), <phg@phi-gamma.net>, Hans Hagen, Khaled Hosny, Elie Roux
+-- VERSION: just consult Git, okay?
+-----------------------------------------------------------------------
+--
+--- 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 add_to_callback = luatexbase.add_to_callback
+local create_callback = luatexbase.create_callback
+local reset_callback = luatexbase.reset_callback
+local call_callback = luatexbase.call_callback
+local dummy_function = function () end
+
+local install_formats = function ()
+ local fonts = fonts
+ if not fonts then return false end
+
+ local readers = fonts.readers
+ 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" then return false end
+ formats [which] = "type1"
+ readers [which] = reader
+ handlers [which] = { }
+ return true
+ end
+
+ return 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--
-local fonts = fonts
-local readers = fonts.readers
-local handlers = fonts.handlers
-local formats = fonts.formats
-
-local pfb_reader = function (specification)
- return readers.opentype (specification, "pfb", "type1")
-end
-
-local pfa_reader = function (specification)
- return readers.opentype (specification, "pfa", "type1")
+ \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.
+ call_callback ("luaotfload.patch_font", fontdata, specification)
+ else
+ 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, "main", "defining font no. %d", id)
+ logreport ("both", 0, "main", " > active font definer: %q", name)
+ logreport ("both", 0, "main", " > spec %q", specification)
+ logreport ("both", 0, "main", " > at size %.2f pt", size / 2^16)
+ local result = definer (specification, size, id)
+ if not result then
+ logreport ("both", 0, "main", " > font definition failed")
+ return
+ elseif type (result) == "number" then
+ logreport ("both", 0, "main", " > font definition yielded id %d", result)
+ return result
+ end
+ logreport ("both", 0, "main", " > font definition successful")
+ logreport ("both", 0, "main", " > name %q", result.name or "<nil>")
+ logreport ("both", 0, "main", " > fontname %q", result.fontname or "<nil>")
+ logreport ("both", 0, "main", " > fullname %q", result.fullname or "<nil>")
+ return result
+ end
+ end
+
+ definers.patch = patch
+ definers.generic = read
+ definers.info_patch = mk_info "patch"
+ definers.info_generic = mk_info "generic"
end
-formats.pfa = "type1"
-readers.pfa = pfa_reader
-handlers.pfa = { }
+--[[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.
-formats.pfb = "type1"
-readers.pfb = pfb_reader
-handlers.pfb = { }
+ The callbacks initially contain the empty function that we are going
+ to override below.
-formats.ofm = "type1"
-readers.ofm = readers.tfm
-handlers.ofm = { }
+--doc]]--
+return {
+ install = function ()
+ if not install_formats () then
+ logreport ("both", 0, "main", "error initializing OFM/PF{A,B} loaders")
+ end
+ create_callback("luaotfload.patch_font", "simple", dummy_function)
+ create_callback("luaotfload.patch_font_unsafe", "simple", dummy_function)
+
+ reset_callback "define_font"
+ local definer = config.luaotfload.run.definer
+ add_to_callback ("define_font", definers[definer or "patch"],
+ "luaotfload.define_font", 1)
+ end
+}
-- vim:tw=71:sw=2:ts=2:expandtab