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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
-- 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 extra_lists = {
tlig = {
{
endash = "hyphen hyphen",
emdash = "hyphen hyphen hyphen",
-- quotedblleft = "quoteleft quoteleft",
-- quotedblright = "quoteright quoteright",
-- quotedblleft = "grave grave",
-- quotedblright = "quotesingle quotesingle",
-- quotedblbase = "comma comma",
},
},
trep = {
{
-- [0x0022] = 0x201D,
[0x0027] = 0x2019,
-- [0x0060] = 0x2018,
},
},
anum = {
{ -- arabic
[0x0030] = 0x0660,
[0x0031] = 0x0661,
[0x0032] = 0x0662,
[0x0033] = 0x0663,
[0x0034] = 0x0664,
[0x0035] = 0x0665,
[0x0036] = 0x0666,
[0x0037] = 0x0667,
[0x0038] = 0x0668,
[0x0039] = 0x0669,
},
{ -- persian
[0x0030] = 0x06F0,
[0x0031] = 0x06F1,
[0x0032] = 0x06F2,
[0x0033] = 0x06F3,
[0x0034] = 0x06F4,
[0x0035] = 0x06F5,
[0x0036] = 0x06F6,
[0x0037] = 0x06F7,
[0x0038] = 0x06F8,
[0x0039] = 0x06F9,
},
},
}
local extra_features = { -- maybe just 1..n so that we prescribe order
tlig = {
{
features = { ["*"] = { ["*"] = true } },
name = "ctx_tlig_1",
subtables = { "ctx_tlig_1_s" },
type = "gsub_ligature",
flags = { },
},
},
trep = {
{
features = { ["*"] = { ["*"] = true } },
name = "ctx_trep_1",
subtables = { "ctx_trep_1_s" },
type = "gsub_single",
flags = { },
},
},
anum = {
{
features = { arab = { URD = true, dflt = true } },
name = "ctx_anum_1",
subtables = { "ctx_anum_1_s" },
type = "gsub_single",
flags = { },
},
{
features = { arab = { URD = true } },
name = "ctx_anum_2",
subtables = { "ctx_anum_2_s" },
type = "gsub_single",
flags = { },
},
},
}
local function enhancedata(data,filename,raw)
local descriptions = data.descriptions
local resources = data.resources
local lookups = resources.lookups
local gsubfeatures = resources.features.gsub
local sequences = resources.sequences
local fontfeatures = resources.features
local unicodes = resources.unicodes
local lookuptypes = resources.lookuptypes
local splitter = lpeg.splitter(" ",unicodes)
for feature, specifications in next, extra_features do
if gsub and gsub[feature] then
-- already present
else
local done = 0
for s=1,#specifications do
local specification = specifications[s]
local askedfeatures = specification.features
local subtables = specification.subtables
local featurename = specification.name
local featuretype = specification.type
local featureflags = specification.flags
local full = subtables[1]
local list = extra_lists[feature][s]
local added = false
if featuretype == "gsub_ligature" then
lookuptypes[full] = "ligature"
for name, ligature in next, list do
local unicode = unicodes[name]
local description = descriptions[unicode]
if description then
local slookups = description.slookups
if slookups then
slookups[full] = { lpegmatch(splitter,ligature) }
else
description.slookups = { [full] = { lpegmatch(splitter,ligature) } }
end
done, added = done + 1, true
end
end
elseif featuretype == "gsub_single" then
lookuptypes[full] = "substitution"
for name, replacement in next, list do
local unicode = unicodes[name]
local description = descriptions[unicode]
if description then
local slookups = description.slookups
if slookups then
slookups[full] = unicodes[replacement]
else
description.slookups = { [full] = unicodes[replacement] }
end
done, added = done + 1, true
end
end
end
if added then
sequences[#sequences+1] = {
chain = 0,
features = { [feature] = askedfeatures },
flags = featureflags,
name = featurename,
subtables = subtables,
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
end
otf.enhancers.register("check extra features",enhancedata)
registerotffeature {
name = 'tlig',
description = 'tex ligatures',
}
registerotffeature {
name = 'trep',
description = 'tex replacements',
}
registerotffeature {
name = 'anum',
description = 'arabic digits',
}
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