From 830a0fa4481fba007af873ea4ec18451e1806aee Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg42.2a@gmail.com>
Date: Wed, 22 May 2013 22:58:42 +0200
Subject: import legacy aux functionality that was removed from fontspec
---
luaotfload-legacy.lua | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 136 insertions(+)
diff --git a/luaotfload-legacy.lua b/luaotfload-legacy.lua
index e0c2230..f3f7c76 100644
--- a/luaotfload-legacy.lua
+++ b/luaotfload-legacy.lua
@@ -263,4 +263,140 @@ end
luatexbase.add_to_callback("luaotfload.patch_font", set_sscale_diments, "unicodemath.set_sscale_diments")
+--[[doc--
+ Version 2.3c of fontspec dropped a couple features that are now
+ provided in the luaotfload auxiliary libraries. To avoid breaking
+ Mik\TEX (again), which is sorta the entire point of distributing the
+ legacy codebase, we temporarily restore those functions here.
+
+ Note that apart from cosmetic changes these are still the same as in
+ pre-TL2013 fontspec, relying on pairs() and other inefficient methods.
+--doc]]--
+
+luaotfload.aux = luaotfload.aux or { }
+local aux = luaotfload.aux
+
+local stringlower = string.lower
+local fontid = font.id
+
+local identifiers = fonts.identifiers
+
+local check_script = function (id, script)
+ local s = stringlower(script)
+ if id and id > 0 then
+ local tfmdata = identifiers[id]
+ local otfdata = tfmdata.shared and tfmdata.shared.otfdata
+ if otfdata then
+ local features = otfdata.luatex.features
+ for i, _ in pairs(features) do
+ for j, _ in pairs(features[i]) do
+ if features[i][j][s] then
+ fontspec.log("script '%s' exists in font '%s'",
+ script, tfmdata.fullname)
+ return true
+ end
+ end
+ end
+ end
+ end
+end
+
+local check_language = function (id, script, language)
+ local s = stringlower(script)
+ local l = stringlower(language)
+ if id and id > 0 then
+ local tfmdata = identifiers[id]
+ local otfdata = tfmdata.shared and tfmdata.shared.otfdata
+ if otfdata then
+ local features = otfdata.luatex.features
+ for i, _ in pairs(features) do
+ for j, _ in pairs(features[i]) do
+ if features[i][j][s] and features[i][j][s][l] then
+ fontspec.log("language '%s' for script '%s' exists in font '%s'",
+ language, script, tfmdata.fullname)
+ return true
+ end
+ end
+ end
+ end
+ end
+end
+
+local check_feature = function (id, script, language, feature)
+ local s = stringlower(script)
+ local l = stringlower(language)
+ local f = stringlower(feature:gsub("^[+-]", ""):gsub("=.*$", ""))
+ if id and id > 0 then
+ local tfmdata = identifiers[id]
+ local otfdata = tfmdata.shared and tfmdata.shared.otfdata
+ if otfdata then
+ local features = otfdata.luatex.features
+ for i, _ in pairs(features) do
+ if features[i][f] and features[i][f][s] then
+ if features[i][f][s][l] == true then
+ fontspec.log("feature '%s' for language '%s' and script '%s' exists in font '%s'",
+ feature, language, script, tfmdata.fullname)
+ return true
+ end
+ end
+ end
+ end
+ end
+end
+
+local get_math_dimension = function(fnt, str)
+ if type(fnt) == "string" then
+ fnt = fontid(fnt)
+ end
+ local tfmdata = identifiers[fnt]
+ if tfmdata then
+ local mathdata = tfmdata.MathConstants
+ if mathdata then
+ return mathdata[str]
+ end
+ end
+end
+
+aux.check_script = check_script
+aux.check_language = check_language
+aux.check_feature = check_feature
+aux.get_math_dimension = get_math_dimension
+
+local set_capheight = function (tfmdata)
+ local capheight
+ local shared = tfmdata.shared
+ if shared then
+ local metadata = shared.otfdata.metadata
+ local units_per_em = metadata.units_per_em or tfmdata.units
+ local os2_capheight = shared.otfdata.pfminfo.os2_capheight
+ local size = tfmdata.size
+
+ if os2_capheight > 0 then
+ capheight = os2_capheight / units_per_em * size
+ else
+ local X8 = string.byte"X"
+ if tfmdata.characters[X8] then
+ capheight = tfmdata.characters[X8].height
+ else
+ capheight = metadata.ascent / units_per_em * size
+ end
+ end
+ else
+ local X8 = string.byte"X"
+ if tfmdata.characters[X8] then
+ capheight = tfmdata.characters[X8].height
+ end
+ end
+ if capheight then
+ tfmdata.parameters[8] = capheight
+ end
+end
+luatexbase.add_to_callback("luaotfload.patch_font",
+ set_capheight,
+ "luaotfload.set_capheight")
+
+--[[doc--
+End of auxiliary functionality that was moved from fontspec.lua.
+--doc]]--
+
-- vim:ts=2:sw=2:expandtab:ft=lua
--
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