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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 otf = fonts.otf
local tfm = fonts.tfm
-- 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
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 = { { scripts = { { script = "*", langs = { "*" }, } }, tag = "tlig", comment = "added bij mkiv" }, },
name = "ctx_tlig_1",
subtables = { { name = "ctx_tlig_1_s" } },
type = "gsub_ligature",
flags = { },
},
},
trep = {
{
features = { { scripts = { { script = "*", langs = { "*" }, } }, tag = "trep", comment = "added bij mkiv" }, },
name = "ctx_trep_1",
subtables = { { name = "ctx_trep_1_s" } },
type = "gsub_single",
flags = { },
},
},
anum = {
{
features = { { scripts = { { script = "arab", langs = { "dflt", "ARA" }, } }, tag = "anum", comment = "added bij mkiv" }, },
name = "ctx_anum_1",
subtables = { { name = "ctx_anum_1_s" } },
type = "gsub_single",
flags = { },
},
{
features = { { scripts = { { script = "arab", langs = { "FAR" }, } }, tag = "anum", comment = "added bij mkiv" }, },
name = "ctx_anum_2",
subtables = { { name = "ctx_anum_2_s" } },
type = "gsub_single",
flags = { },
},
},
}
fonts.otf.enhancers["add some missing characters"] = function(data,filename)
-- todo
end
fonts.otf.enhancers["enrich with features"] = function(data,filename)
-- could be done elsewhere (true can be #)
local used = { }
for i=1,#otf.glists do
local g = data[otf.glists[i]]
if g then
for i=1,#g do
local f = g[i].features
if f then
for i=1,#f do
local t = f[i].tag
if t then used[t] = true end
end
end
end
end
end
--
local glyphs = data.glyphs
local indices = data.map.map
data.gsub = data.gsub or { }
for kind, specifications in next, extra_features do
if not used[kind] then
local done = 0
for s=1,#specifications do
local added = false
local specification = specifications[s]
local list = extra_lists[kind][s]
local name = specification.name .. "_s"
if specification.type == "gsub_ligature" then
for unicode, index in next, indices do
local glyph = glyphs[index]
local ligature = list[glyph.name]
if ligature then
local o = glyph.lookups or { }
-- o[name] = { "ligature", ligature, glyph.name }
o[name] = {
{
["type"] = "ligature",
["specification"] = {
char = glyph.name,
components = ligature,
}
}
}
glyph.lookups, done, added = o, done+1, true
end
end
elseif specification.type == "gsub_single" then
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
local o = glyph.lookups or { }
-- o[name] = { { "substitution", glyphs[replacement].name } }
o[name] = {
{
["type"] = "substitution",
["specification"] = {
variant = glyphs[replacement].name,
}
}
}
glyph.lookups, done, added = o, done+1, true
end
end
end
end
if added then
insert(data.gsub,s,table.fastcopy(specification)) -- right order
end
end
if done > 0 then
if trace_loading then
logs.report("load otf","enhance: registering %s feature (%s glyphs affected)",kind,done)
end
end
end
end
end
otf.tables.features['tlig'] = 'TeX Ligatures'
otf.tables.features['trep'] = 'TeX Replacements'
otf.tables.features['anum'] = 'Arabic Digits'
otf.features.register_base_substitution('tlig')
otf.features.register_base_substitution('trep')
otf.features.register_base_substitution('anum')
-- the functionality is defined elsewhere
fonts.initializers.base.otf.equaldigits = fonts.initializers.common.equaldigits
fonts.initializers.node.otf.equaldigits = fonts.initializers.common.equaldigits
fonts.initializers.base.otf.lineheight = fonts.initializers.common.lineheight
fonts.initializers.node.otf.lineheight = fonts.initializers.common.lineheight
fonts.initializers.base.otf.compose = fonts.initializers.common.compose
fonts.initializers.node.otf.compose = fonts.initializers.common.compose
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