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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
-- 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 fonts = fonts
local otf = fonts.otf
local report_otf = logs.new("load otf")
-- instead of "script = "DFLT", langs = { 'dflt' }" we now use wildcards (we used to
-- have always); some day we can write a "force always when true" trick for other
-- features as well
--
-- we could have a tnum variant as well
-- 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",
exclamdown = "exclam grave",
questiondown = "question grave",
guillemotleft = "less less",
guillemotright= "greater greater",
},
},
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 = { FAR = true, dflt = true } },
name = "ctx_anum_1",
subtables = { "ctx_anum_1_s" },
type = "gsub_single",
flags = { },
},
{
features = { arab = { FAR = true } },
name = "ctx_anum_2",
subtables = { "ctx_anum_2_s" },
type = "gsub_single",
flags = { },
},
},
}
local function enhancedata(data,filename,raw)
local luatex = data.luatex
local lookups = luatex.lookups
local sequences = luatex.sequences
local glyphs = data.glyphs
local indices = luatex.indices
local gsubfeatures = luatex.features.gsub
for kind, specifications in next, extra_features do
if gsub and gsub[kind] then
-- already present
else
local done = 0
for s=1,#specifications do
local added = false
local specification = specifications[s]
local features, subtables = specification.features, specification.subtables
local name, type, flags = specification.name, specification.type, specification.flags
local full = subtables[1]
local list = extra_lists[kind][s]
if type == "gsub_ligature" then
-- inefficient loop
for unicode, index in next, indices do
local glyph = glyphs[index]
local ligature = list[glyph.name]
if ligature then
if glyph.slookups then
glyph.slookups [full] = { "ligature", ligature, glyph.name }
else
glyph.slookups = { [full] = { "ligature", ligature, glyph.name } }
end
done, added = done+1, true
end
end
elseif type == "gsub_single" then
-- inefficient loop
for unicode, index in next, indices do
local glyph = glyphs[index]
local r = list[unicode]
if r then
local replacement = indices[r]
if replacement and glyphs[replacement] then
if glyph.slookups then
glyph.slookups [full] = { "substitution", glyphs[replacement].name }
else
glyph.slookups = { [full] = { "substitution", glyphs[replacement].name } }
end
done, added = done+1, true
end
end
end
end
if added then
sequences[#sequences+1] = {
chain = 0,
features = { [kind] = features },
flags = flags,
name = name,
subtables = subtables,
type = type,
}
-- register in metadata (merge as there can be a few)
if not gsubfeatures then
gsubfeatures = { }
luatex.features.gsub = gsubfeatures
end
local k = gsubfeatures[kind]
if not k then
k = { }
gsubfeatures[kind] = k
end
for script, languages in next, features 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 then
if trace_loading then
report_otf("enhance: registering %s feature (%s glyphs affected)",kind,done)
end
end
end
end
end
otf.enhancers.register("check extra features",enhancedata)
local features = otf.tables.features
features['tlig'] = 'TeX Ligatures'
features['trep'] = 'TeX Replacements'
features['anum'] = 'Arabic Digits'
local registerbasesubstitution = otf.features.registerbasesubstitution
registerbasesubstitution('tlig')
registerbasesubstitution('trep')
registerbasesubstitution('anum')
-- the functionality is defined elsewhere
local initializers = fonts.initializers
local common_initializers = initializers.common
local base_initializers = initializers.base.otf
local node_initializers = initializers.node.otf
base_initializers.equaldigits = common_initializers.equaldigits
node_initializers.equaldigits = common_initializers.equaldigits
base_initializers.lineheight = common_initializers.lineheight
node_initializers.lineheight = common_initializers.lineheight
base_initializers.compose = common_initializers.compose
node_initializers.compose = common_initializers.compose
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