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|
#!/usr/bin/env texlua
-----------------------------------------------------------------------
-- FILE: luaotfload-auxiliary.lua
-- DESCRIPTION: part of luaotfload
-- REQUIREMENTS: luaotfload 2.5
-- AUTHOR: Khaled Hosny, Élie Roux, Philipp Gesang
-- VERSION: 2.5
-- MODIFIED: 2014-01-02 21:24:25+0100
-----------------------------------------------------------------------
--
--- this file addresses issue #24
--- https://github.com/lualatex/luaotfload/issues/24#
luaotfload = luaotfload or {}
luaotfload.aux = luaotfload.aux or { }
local aux = luaotfload.aux
local log = luaotfload.log
local report = log.report
local fonthashes = fonts.hashes
local identifiers = fonthashes.identifiers
local fontnames = fonts.names
local fontid = font.id
local texsprint = tex.sprint
local dofile = dofile
local getmetatable = getmetatable
local setmetatable = setmetatable
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
-----------------------------------------------------------------------
--- https://github.com/khaledhosny/luaotfload/issues/54
local rewrite_fontname = function (tfmdata, specification)
tfmdata.name = [["]] .. specification .. [["]]
end
local rewriting = false
local start_rewrite_fontname = function ()
if rewriting == false then
luatexbase.add_to_callback (
"luaotfload.patch_font",
rewrite_fontname,
"luaotfload.rewrite_fontname")
rewriting = true
report ("log", 1, "aux",
"start rewriting tfmdata.name field")
end
end
aux.start_rewrite_fontname = start_rewrite_fontname
local stop_rewrite_fontname = function ()
if rewriting == true then
luatexbase.remove_fromt_callback
("luaotfload.patch_font", "luaotfload.rewrite_fontname")
rewriting = false
report ("log", 1, "aux",
"stop rewriting tfmdata.name field")
end
end
aux.stop_rewrite_fontname = stop_rewrite_fontname
--[[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 and shared.rawdata.metadata.pfminfo 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 and characters
-----------------------------------------------------------------------
local agl = fonts.encodings.agl
--- 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
--- undocumented
local raw_slot_of_name = function (font_id, glyphname)
local fontdata = font.fonts[font_id]
if fontdata.type == "virtual" then --- get base font for glyph idx
local codepoint = agl.unicodes[glyphname]
local glyph = fontdata.characters[codepoint]
if fontdata.characters[codepoint] then
return codepoint
end
end
return false
end
--[[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
The “unsafe” switch triggers a fallback lookup in the raw fonts
table. As some of the information is stored as references, this may
have unpredictable side-effects.
--doc]]--
--- int -> string -> bool -> (int | false)
local slot_of_name = function (font_id, glyphname, unsafe)
local fontdata = identifiers[font_id]
if fontdata then
local unicode = fontdata.resources.unicodes[glyphname]
if unicode then
if type(unicode) == "number" then
return unicode
else
return unicode[1] --- for multiple components
end
-- else
-- --- missing
end
elseif unsafe == true then -- for Robert
return raw_slot_of_name(font_id, glyphname)
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 = 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
--[[doc--
In Context, characters.data is where the data from char-def.lua
resides. The file is huge (>3.7 MB as of 2013) and not part of the
isolated font loader. Nevertheless, we include a partial version
generated by the mkcharacters script that contains only the
a subset of the fields of each character defined.
Currently, these are (compare the mkcharacters script!)
· "direction"
· "mirror"
· "category"
· "textclass"
The directional information is required for packages like Simurgh [0]
to work correctly. In an early stage [1] it was necessary to load
further files from Context directly, including the full blown version
of char-def. Since we have no use for most of the so imported
functionality, the required parts have been isolated and are now
instated along with luaotfload-characters.lua. We can extend the set
of imported features easily should it not be enough.
[0] https://github.com/persian-tex/simurgh
[1] http://tex.stackexchange.com/a/132301/14066
--doc]]--
characters = characters or { } --- should be created in basics-gen
characters.data = nil
local chardef = "luaotfload-characters"
do
local setmetatableindex = function (t, f)
local mt = getmetatable (t)
if mt then
mt.__index = f
else
setmetatable (t, { __index = f })
end
end
--- there are some special tables for each field that provide access
--- to fields of the character table by means of a metatable
local mkcharspecial = function (characters, tablename, field)
local chardata = characters.data
if chardata then
local newspecial = { }
characters [tablename] = newspecial --> e.g. “characters.data.mirrors”
local idx = function (t, char)
local c = chardata [char]
if c then
local m = c [field] --> e.g. “mirror”
if m then
t [char] = m
return m
end
end
newspecial [char] = false
return char
end
setmetatableindex (newspecial, idx)
end
end
local mkcategories = function (characters) -- different from the others
local chardata = characters.data
setmetatable (characters, { __index = function (t, char)
if char then
local c = chardata [char]
c = c.category or char
t [char] = c
return c
end
end})
end
local load_failed = false
local chardata --> characters.data; loaded on demand
local load_chardef = function ()
report ("both", 1, "aux", "Loading character metadata from %s.", chardef)
chardata = dofile (kpse.find_file (chardef, "lua"))
if chardata == nil then
warning ("Could not load %s; continuing \z
with empty character table.",
chardef)
chardata = { }
load_failed = true
end
characters = { } --- nuke metatable
characters.data = chardata
--- institute some of the functionality from char-ini.lua
mkcharspecial (characters, "mirrors", "mirror")
mkcharspecial (characters, "directions", "direction")
mkcharspecial (characters, "textclasses", "textclass")
mkcategories (characters)
end
local charindex = function (t, k)
if chardata == nil and load_failed ~= true then
load_chardef ()
end
return characters [k]
end
setmetatableindex (characters, charindex)
end
-----------------------------------------------------------------------
--- 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 tfmdata = identifiers[font_id] if not tfmdata then return false end
local shared = tfmdata.shared if not shared then return false end
local fontdata = shared.rawdata if not fontdata then return false end
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
report ("log", 1, "aux",
"font no %d (%s) defines feature %s for script %s",
font_id, fontname, feature, asked_script)
return true
end
end
end
report ("log", 0, "aux",
"font no %d (%s) defines no feature for script %s",
font_id, fontname, asked_script)
end
report ("log", 0, "aux", "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 tfmdata = identifiers[font_id] if not tfmdata then return false end
local shared = tfmdata.shared if not shared then return false end
local fontdata = shared.rawdata if not fontdata then return false end
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
report ("log", 1, "aux",
"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
report ("log", 0, "aux",
"font no %d (%s) defines no feature "
.. "for script %s with language %s",
font_id, fontname, asked_script, asked_language)
end
report ("log", 0, "aux", "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 tfmdata = identifiers[font_id] if not tfmdata then return false end
local shared = tfmdata.shared if not shared then return false end
local fontdata = shared.rawdata if not fontdata then return false end
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
report ("log", 1, "aux",
"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
report ("log", 0, "aux",
"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
report ("log", 0, "aux", "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
-----------------------------------------------------------------------
local namesresolve = fontnames.resolve
local namesscan_dir = fontnames.scan_dir
--[====[-- TODO -> port this to new db model
--- local directories -------------------------------------------------
--- 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 = 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
--]====]--
aux.scan_external_dir = function ()
print "ERROR: scan_external_dir() is not implemented"
end
--- db queries --------------------------------------------------------
--- https://github.com/lualatex/luaotfload/issues/74
--- string -> (string * int)
local resolve_fontname = function (name)
local foundname, subfont, success = namesresolve(nil, nil, {
name = name,
lookup = "name",
optsize = 0,
specification = "name:" .. name,
})
if success then
return foundname, subfont
end
return false, false
end
aux.resolve_fontname = resolve_fontname
--- string list -> (string * int)
local resolve_fontlist
resolve_fontlist = function (names, n)
if not n then
return resolve_fontlist(names, 1)
end
local this = names[n]
if this then
local foundname, subfont = resolve_fontname(this)
if foundname then
return foundname, subfont
end
return resolve_fontlist(names, n+1)
end
return false, false
end
aux.resolve_fontlist = resolve_fontlist
--- index access ------------------------------------------------------
--- Based on a discussion on the Luatex mailing list:
--- http://tug.org/pipermail/luatex/2014-June/004881.html
--[[doc--
aux.read_font_index -- Read the names index from the canonical
location and return its contents. This does not affect the behavior
of Luaotfload: The returned table is independent of what the font
resolvers use internally. Access is raw: each call to the function
will result in the entire table being re-read from disk.
--doc]]--
local load_names = fontnames.load
local access_font_index = fontnames.access_font_index
local read_font_index = function ()
return load_names (true) or { }
end
--[[doc--
aux.font_index -- Access Luaotfload’s internal database. If the
database hasn’t been loaded yet this will cause it to be loaded, with
all the possible side-effects like for instance creating the index
file if it doesn’t exist, reading all font files, &c.
--doc]]--
local font_index = function () return access_font_index () end
aux.read_font_index = read_font_index
aux.font_index = font_index
--- loaded fonts ------------------------------------------------------
--- just a proof of concept
--- fontobj -> string list -> (string list) list
local get_font_data get_font_data = function (tfmdata, keys, acc, n)
if not acc then
return get_font_data(tfmdata, keys, {}, 1)
end
local key = keys[n]
if key then
local val = tfmdata[key]
if val then
acc[#acc+1] = val
else
acc[#acc+1] = false
end
return get_font_data(tfmdata, keys, acc, n+1)
end
return acc
end
--[[doc--
The next one operates on the fonts.hashes.identifiers table.
It returns a list containing tuples of font ids and the
contents of the fields specified in the first argument.
Font table entries that were created indirectly -- e.g. by
\letterspacefont or during font expansion -- will not be
listed.
--doc]]--
local default_keys = { "fullname" }
--- string list -> (int * string list) list
local get_loaded_fonts get_loaded_fonts = function (keys, acc, lastid)
if not acc then
if not keys then
keys = default_keys
end
return get_loaded_fonts(keys, {}, lastid)
end
local id, tfmdata = next(identifiers, lastid)
if id then
local data = get_font_data(tfmdata, keys)
acc[#acc+1] = { id, data }
return get_loaded_fonts (keys, acc, id)
end
return acc
end
aux.get_loaded_fonts = get_loaded_fonts
--- Raw access to the font.* namespace is unsafe so no documentation on
--- this one.
local get_raw_fonts = function ( )
local res = { }
for i, v in font.each() do
if v.filename then
res[#res+1] = { i, v }
end
end
return res
end
aux.get_raw_fonts = get_raw_fonts
-----------------------------------------------------------------------
--- font parameters
-----------------------------------------------------------------------
--- analogy of font-hsh
fonthashes.parameters = fonthashes.parameters or { }
fonthashes.quads = fonthashes.quads or { }
local parameters = fonthashes.parameters or { }
local quads = fonthashes.quads or { }
setmetatable(parameters, { __index = function (t, font_id)
local tfmdata = identifiers[font_id]
if not tfmdata then --- unsafe; avoid
tfmdata = font.fonts[font_id]
end
if tfmdata and type(tfmdata) == "table" then
local fontparameters = tfmdata.parameters
t[font_id] = fontparameters
return fontparameters
end
return nil
end})
--[[doc--
Note that the reason as to why we prefer functions over table indices
is that functions are much safer against unintended manipulation.
This justifies the overhead they cost.
--doc]]--
--- int -> (number | false)
local get_quad = function (font_id)
local quad = quads[font_id]
if quad then
return quad
end
local fontparameters = parameters[font_id]
if fontparameters then
local quad = fontparameters.quad or 0
quads[font_id] = quad
return quad
end
return false
end
aux.get_quad = get_quad
-- vim:tw=71:sw=2:ts=2:expandtab
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