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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: 2.2
-- 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 warning = luaotfload.log
local identifiers = fonts.hashes.identifiers
local fontid = font.id
local texsprint = tex.sprint
local utf8 = unicode.utf8
local stringlower = string.lower
local stringformat = string.format
local stringgsub = string.gsub
local stringbyte = string.byte
local stringfind = string.find
local tablecopy = table.copy
-----------------------------------------------------------------------
--- font patches
-----------------------------------------------------------------------
--[[doc--
The font object (tfmdata) structure has changed since version 1.x, so
in case other packages haven’t been updated we put fallbacks in place
where they’d expect them. Specifically we have in mind:
· fontspec
· unicode-math
· microtype (most likely fixed till TL2013)
--doc]]--
--- fontobj -> fontobj
local add_fontdata_fallbacks = function (fontdata)
if type(fontdata) == "table" then
local fontparameters = fontdata.parameters
local metadata
if not fontdata.shared then --- that would be a tfm
--- we can’t really catch everything that
--- goes wrong; for some reason, fontspec.lua
--- just assumes it always gets an otf object,
--- so its capheight callback, which does not
--- bother to do any checks, will access
--- fontdata.shared no matter what ...
fontdata.units = fontdata.units_per_em
else --- otf
metadata = fontdata.shared.rawdata.metadata
fontdata.name = metadata.origname or fontdata.name
fontdata.units = fontdata.units_per_em
fontdata.size = fontdata.size or fontparameters.size
local resources = fontdata.resources
--- for legacy fontspec.lua and unicode-math.lua
fontdata.shared.otfdata = {
pfminfo = { os2_capheight = metadata.pfminfo.os2_capheight },
metadata = { ascent = metadata.ascent },
}
--- for microtype and fontspec
local fake_features = { } -- wrong: table.copy(resources.features)
setmetatable(fake_features, { __index = function (tab, idx)
warning("some package (probably fontspec) is outdated")
warning(
"attempt to index " ..
"tfmdata.shared.otfdata.luatex.features (%s)",
idx)
--os.exit(1)
return nil --- empty anyways
end})
fontdata.shared.otfdata.luatex = {
unicodes = resources.unicodes,
features = fake_features,
}
end
end
return fontdata
end
--if config.luaotfload.compatibility == true then
if true then
luatexbase.add_to_callback(
"luaotfload.patch_font",
add_fontdata_fallbacks,
"luaotfload.fontdata_fallbacks")
end
--[[doc--
Additionally, the font registry is expected at fonts.identifiers
(fontspec) or fonts.ids (microtype), but in the meantime it has been
migrated to fonts.hashes.identifiers. We’ll make luaotfload satisfy
those assumptions. (Maybe it’d be more appropriate to use
font.getfont() since Hans made it a harmless wrapper [1].)
[1] http://www.ntg.nl/pipermail/ntg-context/2013/072166.html
--doc]]--
fonts.identifiers = fonts.hashes.identifiers
fonts.ids = fonts.hashes.identifiers
--[[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]]--
--- fontobj -> unit
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
--[[doc--
This one is approximately “name_to_slot” from the microtype package;
note that it is all about Adobe Glyph names and glyph slots in the
font. The names and values may diverge from actual Unicode.
http://www.adobe.com/devnet/opentype/archives/glyph.html
--doc]]--
--- int -> string -> (int | false)
local slot_of_name = function (font_id, glyphname)
local fontdata = identifiers[font_id]
if fontdata then
local unicode = fontdata.resources.unicodes[glyphname]
if unicode and type(unicode) == "number" then
return unicode
else
return unicode[1] --- for multiple components
end
end
return false
end
aux.slot_of_name = slot_of_name
--[[doc--
Inverse of above; not authoritative as to my knowledge the official
inverse of the AGL is the AGLFN. Maybe this whole issue should be
dealt with in a separate package that loads char-def.lua and thereby
solves the problem for the next couple decades.
http://partners.adobe.com/public/developer/en/opentype/aglfn13.txt
--doc]]--
local indices
--- int -> (string | false)
local name_of_slot = function (codepoint)
if not indices then --- this will load the glyph list
local unicodes = fonts.encodings.agl.unicodes
indices = table.swapped(unicodes)
end
local glyphname = indices[codepoint]
if glyphname then
return glyphname
end
return false
end
aux.name_of_slot = name_of_slot
-----------------------------------------------------------------------
--- 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
-----------------------------------------------------------------------
--- font dimensions
-----------------------------------------------------------------------
--- int -> string -> int
local get_math_dimension = function (font_id, dimenname)
if type(font_id) == "string" then
font_id = fontid(font_id) --- safeguard
end
local fontdata = identifiers[font_id]
local mathdata = fontdata.mathparameters
if mathdata then
return mathdata[dimenname] or 0
end
return 0
end
aux.get_math_dimension = get_math_dimension
--- int -> string -> unit
local sprint_math_dimension = function (font_id, dimenname)
if type(font_id) == "string" then
font_id = fontid(font_id)
end
local dim = get_math_dimension(font_id, dimenname)
texsprint(luatexbase.catcodetables["latex-package"], dim, "sp")
end
aux.sprint_math_dimension = sprint_math_dimension
-----------------------------------------------------------------------
--- extra database functions
-----------------------------------------------------------------------
--- migrated from luaotfload-database.lua
--- https://github.com/lualatex/luaotfload/pull/61#issuecomment-17776975
--- string -> (int, int)
local scan_external_dir = function (dir)
local old_names, new_names = names.data
if not old_names then
old_names = load_names()
end
new_names = tablecopy(old_names)
local n_scanned, n_new = fonts.names.scan_dir(dir, old_names,
new_names)
--- FIXME
--- This doesn’t seem right. If a db update is triggered after this
--- point, then the added fonts will be saved along with it --
--- which is not as “temporarily” as it should be. (This should be
--- addressed during a refactoring of names_resolve().)
names.data = new_names
return n_scanned, n_new
end
aux.scan_external_dir = scan_external_dir
-- vim:tw=71:sw=2:ts=2:expandtab
|