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if not modules then modules = { } end modules ['font-otc'] = {
version = 1.001,
comment = "companion to font-otf.lua (context)",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local format, insert = string.format, table.insert
local type, next = type, next
local lpegmatch = lpeg.match
-- we assume that the other otf stuff is loaded already
local trace_loading = false trackers.register("otf.loading", function(v) trace_loading = v end)
local report_otf = logs.reporter("fonts","otf loading")
local fonts = fonts
local otf = fonts.handlers.otf
local otffeatures = fonts.constructors.newfeatures("otf")
local registerotffeature = otffeatures.register
local setmetatableindex = table.setmetatableindex
-- In the userdata interface we can not longer tweak the loaded font as
-- conveniently as before. For instance, instead of pushing extra data in
-- in the table using the original structure, we now have to operate on
-- the mkiv representation. And as the fontloader interface is modelled
-- after fontforge we cannot change that one too much either.
local types = {
substitution = "gsub_single",
ligature = "gsub_ligature",
alternate = "gsub_alternate",
}
setmetatableindex(types, function(t,k) t[k] = k return k end) -- "key"
local everywhere = { ["*"] = { ["*"] = true } } -- or: { ["*"] = { "*" } }
local noflags = { }
local function addfeature(data,feature,specifications)
local descriptions = data.descriptions
local resources = data.resources
local lookups = resources.lookups
local gsubfeatures = resources.features.gsub
if gsubfeatures and gsubfeatures[feature] then
-- already present
else
local sequences = resources.sequences
local fontfeatures = resources.features
local unicodes = resources.unicodes
local lookuptypes = resources.lookuptypes
local splitter = lpeg.splitter(" ",unicodes)
local done = 0
if not specifications[1] then
-- so we accept a one entry specification
specifications = { specifications }
end
-- subtables are tables themselves but we also accept flattened singular subtables
for s=1,#specifications do
local specification = specifications[s]
local askedfeatures = specification.features or everywhere
local subtables = specification.subtables or { specification.data } or { }
local featuretype = types[specification.type or "substitution"]
local featureflags = specification.flags or noflags
local added = false
local featurename = format("ctx_%s_%s",feature,s)
local st = { }
for t=1,#subtables do
local list = subtables[t]
local full = format("%s_%s",featurename,t)
st[t] = full
if featuretype == "gsub_ligature" then
lookuptypes[full] = "ligature"
for code, ligature in next, list do
local unicode = tonumber(code) or unicodes[code]
local description = descriptions[unicode]
if description then
local slookups = description.slookups
if type(ligature) == "string" then
ligature = { lpegmatch(splitter,ligature) }
end
if slookups then
slookups[full] = ligature
else
description.slookups = { [full] = ligature }
end
done, added = done + 1, true
end
end
elseif featuretype == "gsub_single" then
lookuptypes[full] = "substitution"
for code, replacement in next, list do
local unicode = tonumber(code) or unicodes[code]
local description = descriptions[unicode]
if description then
local slookups = description.slookups
replacement = tonumber(replacement) or unicodes[replacement]
if slookups then
slookups[full] = replacement
else
description.slookups = { [full] = replacement }
end
done, added = done + 1, true
end
end
end
end
if added then
-- script = { lang1, lang2, lang3 } or script = { lang1 = true, ... }
for k, v in next, askedfeatures do
if v[1] then
askedfeatures[k] = table.tohash(v)
end
end
sequences[#sequences+1] = {
chain = 0,
features = { [feature] = askedfeatures },
flags = featureflags,
name = featurename,
subtables = st,
type = featuretype,
}
-- register in metadata (merge as there can be a few)
if not gsubfeatures then
gsubfeatures = { }
fontfeatures.gsub = gsubfeatures
end
local k = gsubfeatures[feature]
if not k then
k = { }
gsubfeatures[feature] = k
end
for script, languages in next, askedfeatures do
local kk = k[script]
if not kk then
kk = { }
k[script] = kk
end
for language, value in next, languages do
kk[language] = value
end
end
end
end
if done > 0 and trace_loading then
report_otf("enhance: registering %s feature (%s glyphs affected)",feature,done)
end
end
end
otf.enhancers.addfeature = addfeature
local extrafeatures = { }
function otf.addfeature(name,specification)
extrafeatures[name] = specification
end
local function enhance(data,filename,raw)
for feature, specification in next, extrafeatures do
addfeature(data,feature,specification)
end
end
otf.enhancers.register("check extra features",enhance)
-- tlig --
local tlig = {
endash = "hyphen hyphen",
emdash = "hyphen hyphen hyphen",
-- quotedblleft = "quoteleft quoteleft",
-- quotedblright = "quoteright quoteright",
-- quotedblleft = "grave grave",
-- quotedblright = "quotesingle quotesingle",
-- quotedblbase = "comma comma",
}
local tlig_specification = {
type = "ligature",
features = everywhere, -- { ["*"] = { ["*"] = true } },
data = tlig,
flags = noflags, -- { },
}
otf.addfeature("tlig",tlig_specification)
registerotffeature {
name = 'tlig',
description = 'tex ligatures',
}
-- trep
local trep = {
-- [0x0022] = 0x201D,
[0x0027] = 0x2019,
-- [0x0060] = 0x2018,
}
local trep_specification = {
type = "substitution",
features = everywhere, -- { ["*"] = { ["*"] = true } },
data = trep,
flags = noflags, -- { },
}
otf.addfeature("trep",trep_specification)
registerotffeature {
name = 'trep',
description = 'tex replacements',
}
-- anum
local anum_arabic = {
[0x0030] = 0x0660,
[0x0031] = 0x0661,
[0x0032] = 0x0662,
[0x0033] = 0x0663,
[0x0034] = 0x0664,
[0x0035] = 0x0665,
[0x0036] = 0x0666,
[0x0037] = 0x0667,
[0x0038] = 0x0668,
[0x0039] = 0x0669,
}
local anum_persian = {
[0x0030] = 0x06F0,
[0x0031] = 0x06F1,
[0x0032] = 0x06F2,
[0x0033] = 0x06F3,
[0x0034] = 0x06F4,
[0x0035] = 0x06F5,
[0x0036] = 0x06F6,
[0x0037] = 0x06F7,
[0x0038] = 0x06F8,
[0x0039] = 0x06F9,
}
local anum_specification = {
{
type = "substitution",
features = { arab = { URD = true, dflt = true } },
data = anum_arabic,
flags = noflags, -- { },
},
{
type = "substitution",
features = { arab = { URD = true } },
data = anum_persian,
flags = noflags, -- { },
},
}
otf.addfeature("anum",anum_specification)
registerotffeature {
name = 'anum',
description = 'arabic digits',
}
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