diff options
Diffstat (limited to 'otfl-font-otb.lua')
| -rw-r--r-- | otfl-font-otb.lua | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/otfl-font-otb.lua b/otfl-font-otb.lua new file mode 100644 index 0000000..20ddbfc --- /dev/null +++ b/otfl-font-otb.lua @@ -0,0 +1,344 @@ +if not modules then modules = { } end modules ['font-otb'] = { + version = 1.001, + comment = "companion to font-ini.tex", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local concat = table.concat +local format, gmatch, gsub, find, match, lower, strip = string.format, string.gmatch, string.gsub, string.find, string.match, string.lower, string.strip +local type, next, tonumber, tostring = type, next, tonumber, tostring + +local otf = fonts.otf +local tfm = fonts.tfm + +local trace_baseinit = false trackers.register("otf.baseinit", function(v) trace_baseinit = v end) +local trace_singles = false trackers.register("otf.singles", function(v) trace_singles = v end) +local trace_multiples = false trackers.register("otf.multiples", function(v) trace_multiples = v end) +local trace_alternatives = false trackers.register("otf.alternatives", function(v) trace_alternatives = v end) +local trace_ligatures = false trackers.register("otf.ligatures", function(v) trace_ligatures = v end) +local trace_kerns = false trackers.register("otf.kerns", function(v) trace_kerns = v end) +local trace_preparing = false trackers.register("otf.preparing", function(v) trace_preparing = v end) + +local wildcard = "*" + +local split_at_space = lpeg.Ct(lpeg.splitat(" ")) -- no trailing or multiple spaces anyway + +local pcache, fcache = { }, { } -- could be weak + +local function gref(descriptions,n) + if type(n) == "number" then + local name = descriptions[n].name + if name then + return format("U+%04X (%s)",n,name) + else + return format("U+%04X") + end + elseif n then + local num, nam = { }, { } + for i=1,#n do + local ni = n[i] + num[i] = format("U+%04X",ni) + nam[i] = descriptions[ni].name or "?" + end + return format("%s (%s)",concat(num," "), concat(nam," ")) + else + return "?" + end +end + +local function cref(kind,lookupname) + if lookupname then + return format("feature %s, lookup %s",kind,lookupname) + else + return format("feature %s",kind) + end +end + +local function resolve_ligatures(tfmdata,ligatures,kind) + kind = kind or "unknown" + local unicodes = tfmdata.unicodes + local characters = tfmdata.characters + local descriptions = tfmdata.descriptions + local changed = tfmdata.changed + local done = { } + while true do + local ok = false + for k,v in next, ligatures do + local lig = v[1] + if not done[lig] then + local ligs = split_at_space:match(lig) + if #ligs == 2 then + local uc = v[2] + local c, f, s = characters[uc], ligs[1], ligs[2] + local uft, ust = unicodes[f] or 0, unicodes[s] or 0 + if not uft or not ust then + logs.report("define otf","%s: unicode problem with base ligature %s = %s + %s",cref(kind),gref(descriptions,uc),gref(descriptions,uft),gref(descriptions,ust)) + -- some kind of error + else + if type(uft) == "number" then uft = { uft } end + if type(ust) == "number" then ust = { ust } end + for ufi=1,#uft do + local uf = uft[ufi] + for usi=1,#ust do + local us = ust[usi] + if changed[uf] or changed[us] then + if trace_baseinit and trace_ligatures then + logs.report("define otf","%s: base ligature %s + %s ignored",cref(kind),gref(descriptions,uf),gref(descriptions,us)) + end + else + local first, second = characters[uf], us + if first and second then + local t = first.ligatures + if not t then + t = { } + first.ligatures = t + end + if type(uc) == "number" then + t[second] = { type = 0, char = uc } + else + t[second] = { type = 0, char = uc[1] } -- can this still happen? + end + if trace_baseinit and trace_ligatures then + logs.report("define otf","%s: base ligature %s + %s => %s",cref(kind),gref(descriptions,uf),gref(descriptions,us),gref(descriptions,uc)) + end + end + end + end + end + end + ok, done[lig] = true, descriptions[uc].name + end + end + end + if ok then + -- done has "a b c" = "a_b_c" and ligatures the already set ligatures: "a b" = 123 + -- and here we add extras (f i i = fi + i and alike) + -- + -- we could use a hash for fnc and pattern + -- + -- this might be interfering ! + for d,n in next, done do + local pattern = pcache[d] if not pattern then pattern = "^(" .. d .. ") " pcache[d] = pattern end + local fnc = fcache[n] if not fnc then fnc = function() return n .. " " end fcache[n] = fnc end + for k,v in next, ligatures do + v[1] = gsub(v[1],pattern,fnc) + end + end + else + break + end + end +end + +local function collect_lookups(otfdata,kind,script,language) + -- maybe store this in the font + local sequences = otfdata.luatex.sequences + if sequences then + local featuremap, featurelist = { }, { } + for s=1,#sequences do + local sequence = sequences[s] + local features = sequence.features + features = features and features[kind] + features = features and (features[script] or features[wildcard]) + features = features and (features[language] or features[wildcard]) + if features then + local subtables = sequence.subtables + if subtables then + for s=1,#subtables do + local ss = subtables[s] + if not featuremap[s] then + featuremap[ss] = true + featurelist[#featurelist+1] = ss + end + end + end + end + end + if #featurelist > 0 then + return featuremap, featurelist + end + end + return nil, nil +end + +local splitter = lpeg.splitat(" ") + +function prepare_base_substitutions(tfmdata,kind,value) -- we can share some code with the node features + if value then + local otfdata = tfmdata.shared.otfdata + local validlookups, lookuplist = collect_lookups(otfdata,kind,tfmdata.script,tfmdata.language) + if validlookups then + local ligatures = { } + local unicodes = tfmdata.unicodes -- names to unicodes + local indices = tfmdata.indices + local characters = tfmdata.characters + local descriptions = tfmdata.descriptions + local changed = tfmdata.changed + for k,c in next, characters do + local glyph = descriptions[k] + local lookups = glyph.lookups + if lookups then + for l=1,#lookuplist do + local lookup = lookuplist[l] + local ps = lookups[lookup] + if ps then + for i=1,#ps do + local p = ps[i] + local t = p[1] + if t == 'substitution' then + local pv = p[2] -- p.variant + if pv then + local upv = unicodes[pv] + if upv then + if type(upv) == "table" then + upv = upv[1] + end + if characters[upv] then + if trace_baseinit and trace_singles then + logs.report("define otf","%s: base substitution %s => %s",cref(kind,lookup),gref(descriptions,k),gref(descriptions,upv)) + end + changed[k] = upv + end + end + end + elseif t == 'alternate' then + local pc = p[2] -- p.components + if pc then + -- a bit optimized ugliness + if value == 1 then + pc = splitter:match(pc) + elseif value == 2 then + local a, b = splitter:match(pc) + pc = b or a + else + pc = { splitter:match(pc) } + pc = pc[value] or pc[#pc] + end + if pc then + local upc = unicodes[pc] + if upc then + if type(upc) == "table" then + upc = upc[1] + end + if characters[upc] then + if trace_baseinit and trace_alternatives then + logs.report("define otf","%s: base alternate %s => %s",cref(kind,lookup),gref(descriptions,k),gref(descriptions,upc)) + end + changed[k] = upc + end + end + end + end + elseif t == 'ligature' and not changed[k] then + local pc = p[2] + if pc then + if trace_baseinit and trace_ligatures then + local upc = { splitter:match(pc) } + for i=1,#upc do upc[i] = unicodes[upc[i]] end + -- we assume that it's no table + logs.report("define otf","%s: base ligature %s => %s",cref(kind,lookup),gref(descriptions,upc),gref(descriptions,k)) + end + ligatures[#ligatures+1] = { pc, k } + end + end + end + end + end + end + end + resolve_ligatures(tfmdata,ligatures,kind) + end + else + tfmdata.ligatures = tfmdata.ligatures or { } -- left over from what ? + end +end + +local function prepare_base_kerns(tfmdata,kind,value) -- todo what kind of kerns, currently all + if value then + local otfdata = tfmdata.shared.otfdata + local validlookups, lookuplist = collect_lookups(otfdata,kind,tfmdata.script,tfmdata.language) + if validlookups then + local unicodes = tfmdata.unicodes -- names to unicodes + local indices = tfmdata.indices + local characters = tfmdata.characters + local descriptions = tfmdata.descriptions + for u, chr in next, characters do + local d = descriptions[u] + if d then + local dk = d.mykerns + if dk then + local t, done = chr.kerns or { }, false + for l=1,#lookuplist do + local lookup = lookuplist[l] + local kerns = dk[lookup] + if kerns then + for k, v in next, kerns do + if v ~= 0 and not t[k] then -- maybe no 0 test here + t[k], done = v, true + if trace_baseinit and trace_kerns then + logs.report("define otf","%s: base kern %s + %s => %s",cref(kind,lookup),gref(descriptions,u),gref(descriptions,k),v) + end + end + end + end + end + if done then + chr.kerns = t -- no empty assignments + end + -- elseif d.kerns then + -- logs.report("define otf","%s: invalid mykerns for %s",cref(kind),gref(descriptions,u)) + end + end + end + end + end +end + +-- In principle we could register each feature individually which was +-- what we did in earlier versions. However, after the rewrite it +-- made more sense to collect them in an overall features initializer +-- just as with the node variant. There it was needed because we need +-- to do complete mixed runs and not run featurewise (as we did before). + +local supported_gsub = { + 'liga','dlig','rlig','hlig', + 'pnum','onum','tnum','lnum', + 'zero', + 'smcp','cpsp','c2sc','ornm','aalt', + 'hwid','fwid', + 'ssty', -- math +} + +local supported_gpos = { + 'kern' +} + +function otf.features.register_base_substitution(tag) + supported_gsub[#supported_gsub+1] = tag +end +function otf.features.register_base_kern(tag) + supported_gsub[#supported_gpos+1] = tag +end + +function fonts.initializers.base.otf.features(tfmdata,value) + if true then -- value then + -- not shared + local t = trace_preparing and os.clock() + local features = tfmdata.shared.features + if features then + for f=1,#supported_gsub do + local feature = supported_gsub[f] + prepare_base_substitutions(tfmdata,feature,features[feature]) + end + for f=1,#supported_gpos do + local feature = supported_gpos[f] + prepare_base_kerns(tfmdata,feature,features[feature]) + end + end + if trace_preparing then + logs.report("otf define","preparation time is %0.3f seconds for %s",os.clock()-t,tfmdata.fullname or "?") + end + end +end |