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#!/usr/bin/env texlua
-----------------------------------------------------------------------
-- FILE: luaotfload-auxiliary.lua
-- DESCRIPTION: part of luaotfload
-- REQUIREMENTS: luaotfload 2.2
-- AUTHOR: Khaled Hosny, Élie Roux, Philipp Gesang
-- VERSION: 1.0
-- CREATED: 2013-05-01 14:40:50+0200
-----------------------------------------------------------------------
--
--- this file addresses issue #24
--- https://github.com/lualatex/luaotfload/issues/24#
luaotfload = luaotfload or {}
luaotfload.aux = luaotfload.aux or { }
config = config or { }
config.luaotfload = config.luaotfload or { }
local aux = luaotfload.aux
local log = luaotfload.log
local identifiers = fonts.hashes.identifiers
local utf8 = unicode.utf8
local stringlower = string.lower
local stringformat = string.format
local stringgsub = string.gsub
local stringbyte = string.byte
-----------------------------------------------------------------------
--- font patches
-----------------------------------------------------------------------
--[[doc--
This sets two dimensions apparently relied upon by the unicode-math
package.
--doc]]--
local set_sscale_dimens = function (fontdata)
local mathconstants = fontdata.MathConstants
local parameters = fontdata.parameters
if mathconstants then
parameters[10] = mathconstants.ScriptPercentScaleDown or 70
parameters[11] = mathconstants.ScriptScriptPercentScaleDown or 50
end
return fontdata
end
luatexbase.add_to_callback(
"luaotfload.patch_font",
set_sscale_dimens,
"luaotfload.aux.set_sscale_dimens")
--- fontobj -> int
local lookup_units = function (fontdata)
local metadata = fontdata.shared and fontdata.shared.rawdata.metadata
if metadata and metadata.units_per_em then
return metadata.units_per_em
elseif fontdata.parameters and fontdata.parameters.units then
return fontdata.parameters.units
elseif fontdata.units then --- v1.x
return fontdata.units
end
return 1000
end
--[[doc--
This callback corrects some values of the Cambria font.
--doc]]--
local patch_cambria_domh = function (fontdata)
local mathconstants = fontdata.MathConstants
if mathconstants and fontdata.psname == "CambriaMath" then
--- my test Cambria has 2048
local units_per_em = fontdata.units_per_em or lookup_units(fontdata)
local sz = fontdata.parameters.size or fontdata.size
local mh = 2800 / units_per_em * sz
if mathconstants.DisplayOperatorMinHeight < mh then
mathconstants.DisplayOperatorMinHeight = mh
end
end
end
luatexbase.add_to_callback(
"luaotfload.patch_font",
patch_cambria_domh,
"luaotfload.aux.patch_cambria_domh")
--[[doc--
Comment from fontspec:
“Here we patch fonts tfm table to emulate \XeTeX's \cs{fontdimen8},
which stores the caps-height of the font. (Cf.\ \cs{fontdimen5} which
stores the x-height.)
Falls back to measuring the glyph if the font doesn't contain the
necessary information.
This needs to be extended for fonts that don't contain an `X'.”
--doc]]--
local set_capheight = function (fontdata)
local shared = fontdata.shared
local parameters = fontdata.parameters
local capheight
if shared then
local units_per_em = parameters.units
local size = parameters.size
local os2_capheight = shared.rawdata.metadata.pfminfo.os2_capheight
if os2_capheight > 0 then
capheight = os2_capheight / units_per_em * size
else
local X8 = stringbyte"X"
if fontdata.characters[X8] then
capheight = fontdata.characters[X8].height
else
capheight = parameters.ascender / units_per_em * size
end
end
else
local X8 = stringbyte"X"
if fontdata.characters[X8] then
capheight = fontdata.characters[X8].height
end
end
if capheight then
--- is this legit? afaics there’s nothing else on the
--- array part of that table
fontdata.parameters[8] = capheight
end
end
luatexbase.add_to_callback(
"luaotfload.patch_font",
set_capheight,
"luaotfload.aux.set_capheight")
-----------------------------------------------------------------------
--- glyphs
-----------------------------------------------------------------------
--- int -> int -> bool
local font_has_glyph = function (font_id, codepoint)
local fontdata = fonts.hashes.identifiers[font_id]
if fontdata then
if fontdata.characters[codepoint] ~= nil then return true end
end
return false
end
aux.font_has_glyph = font_has_glyph
--- int -> bool
local current_font_has_glyph = function (codepoint)
return font_has_glyph (font.current(), codepoint)
end
aux.current_font_has_glyph = current_font_has_glyph
local do_if_glyph_else = function (chr, positive, negative)
local codepoint = tonumber(chr)
if not codepoint then codepoint = utf8.byte(chr) end
if current_font_has_glyph(codepoint) then
tex.sprint(positive)
else
tex.sprint(negative)
end
end
aux.do_if_glyph_else = do_if_glyph_else
-----------------------------------------------------------------------
--- features / scripts / languages
-----------------------------------------------------------------------
--- lots of arrowcode ahead
--[[doc--
This function, modeled after “check_script()” from fontspec, returns
true if in the given font, the script “asked_script” is accounted for in at
least one feature.
--doc]]--
--- int -> string -> bool
local provides_script = function (font_id, asked_script)
asked_script = stringlower(asked_script)
if font_id and font_id > 0 then
local fontdata = identifiers[font_id].shared.rawdata
if fontdata then
local fontname = fontdata.metadata.fontname
local features = fontdata.resources.features
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
for feature, data in next, featuredata do
if data[asked_script] then
log(stringformat(
"font no %d (%s) defines feature %s for script %s",
font_id, fontname, feature, asked_script))
return true
end
end
end
log(stringformat(
"font no %d (%s) defines no feature for script %s",
font_id, fontname, asked_script))
end
end
log(stringformat("no font with id %d", font_id))
return false
end
aux.provides_script = provides_script
--[[doc--
This function, modeled after “check_language()” from fontspec, returns
true if in the given font, the language with tage “asked_language” is
accounted for in the script with tag “asked_script” in at least one
feature.
--doc]]--
--- int -> string -> string -> bool
local provides_language = function (font_id, asked_script, asked_language)
asked_script = stringlower(asked_script)
asked_language = stringlower(asked_language)
if font_id and font_id > 0 then
local fontdata = identifiers[font_id].shared.rawdata
if fontdata then
local fontname = fontdata.metadata.fontname
local features = fontdata.resources.features
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
for feature, data in next, featuredata do
local scriptdata = data[asked_script]
if scriptdata and scriptdata[asked_language] then
log(stringformat("font no %d (%s) defines feature %s "
.. "for script %s with language %s",
font_id, fontname, feature,
asked_script, asked_language))
return true
end
end
end
log(stringformat(
"font no %d (%s) defines no feature for script %s with language %s",
font_id, fontname, asked_script, asked_language))
end
end
log(stringformat("no font with id %d", font_id))
return false
end
aux.provides_language = provides_language
--[[doc--
We strip the syntax elements from feature definitions (shouldn’t
actually be there in the first place, but who cares ...)
--doc]]--
local lpeg = require"lpeg"
local C, P, S = lpeg.C, lpeg.P, lpeg.S
local lpegmatch = lpeg.match
local sign = S"+-"
local rhs = P"=" * P(1)^0 * P(-1)
local strip_garbage = sign^-1 * C((1 - rhs)^1)
--s = "+foo" --> foo
--ss = "-bar" --> bar
--sss = "baz" --> baz
--t = "foo=bar" --> foo
--tt = "+bar=baz" --> bar
--ttt = "-baz=true" --> baz
--
--print(lpeg.match(strip_garbage, s))
--print(lpeg.match(strip_garbage, ss))
--print(lpeg.match(strip_garbage, sss))
--print(lpeg.match(strip_garbage, t))
--print(lpeg.match(strip_garbage, tt))
--print(lpeg.match(strip_garbage, ttt))
--[[doc--
This function, modeled after “check_feature()” from fontspec, returns
true if in the given font, the language with tag “asked_language” is
accounted for in the script with tag “asked_script” in feature
“asked_feature”.
--doc]]--
--- int -> string -> string -> string -> bool
local provides_feature = function (font_id, asked_script,
asked_language, asked_feature)
asked_script = stringlower(asked_script)
asked_language = stringlower(asked_language)
asked_feature = lpegmatch(strip_garbage, asked_feature)
if font_id and font_id > 0 then
local fontdata = identifiers[font_id].shared.rawdata
if fontdata then
local features = fontdata.resources.features
local fontname = fontdata.metadata.fontname
for method, featuredata in next, features do
--- where method: "gpos" | "gsub"
local feature = featuredata[asked_feature]
if feature then
local scriptdata = feature[asked_script]
if scriptdata and scriptdata[asked_language] then
log(stringformat("font no %d (%s) defines feature %s "
.. "for script %s with language %s",
font_id, fontname, asked_feature,
asked_script, asked_language))
return true
end
end
end
log(stringformat(
"font no %d (%s) does not define feature %s for script %s with language %s",
font_id, fontname, asked_feature, asked_script, asked_language))
end
end
log(stringformat("no font with id %d", font_id))
return false
end
aux.provides_feature = provides_feature
-- vim:tw=71:sw=2:ts=2:expandtab
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