diff options
author | Marius <mariausol@gmail.com> | 2013-05-19 20:40:34 +0300 |
---|---|---|
committer | Marius <mariausol@gmail.com> | 2013-05-19 20:40:34 +0300 |
commit | 13ec4b540e0d46c97fd7b089e0b7413da81e0a9f (patch) | |
tree | bebfa563a17c06b3bd3bf8f6f4ba6d025e00d107 /tex/context/base/font-otb.lua | |
parent | 69ad13650cda027526271179e95b5294694143a1 (diff) | |
download | context-13ec4b540e0d46c97fd7b089e0b7413da81e0a9f.tar.gz |
beta 2013.05.19 19:27
Diffstat (limited to 'tex/context/base/font-otb.lua')
-rw-r--r-- | tex/context/base/font-otb.lua | 1314 |
1 files changed, 657 insertions, 657 deletions
diff --git a/tex/context/base/font-otb.lua b/tex/context/base/font-otb.lua index 2a7b821ea..75bda383e 100644 --- a/tex/context/base/font-otb.lua +++ b/tex/context/base/font-otb.lua @@ -1,657 +1,657 @@ -if not modules then modules = { } end modules ['font-otb'] = { - version = 1.001, - comment = "companion to font-ini.mkiv", - 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 lpegmatch = lpeg.match -local utfchar = utf.char - -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_ligatures_detail = false trackers.register("otf.ligatures.detail", function(v) trace_ligatures_detail = 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 report_prepare = logs.reporter("fonts","otf prepare") - -local fonts = fonts -local otf = fonts.handlers.otf - -local otffeatures = otf.features -local registerotffeature = otffeatures.register - -otf.defaultbasealternate = "none" -- first last - -local wildcard = "*" -local default = "dflt" - -local formatters = string.formatters -local f_unicode = formatters["%U"] -local f_uniname = formatters["%U (%s)"] -local f_unilist = formatters["% t (% t)"] - -local function gref(descriptions,n) - if type(n) == "number" then - local name = descriptions[n].name - if name then - return f_uniname(n,name) - else - return f_unicode(n) - end - elseif n then - local num, nam = { }, { } - for i=2,#n do - local ni = n[i] - if tonumber(ni) then -- first is likely a key - local di = descriptions[ni] - num[i] = f_unicode(ni) - nam[i] = di and di.name or "-" - end - end - return f_unilist(num,nam) - else - return "<error in base mode tracing>" - end -end - -local function cref(feature,lookupname) - if lookupname then - return formatters["feature %a, lookup %a"](feature,lookupname) - else - return formatters["feature %a"](feature) - end -end - -local function report_alternate(feature,lookupname,descriptions,unicode,replacement,value,comment) - report_prepare("%s: base alternate %s => %s (%S => %S)", - cref(feature,lookupname), - gref(descriptions,unicode), - replacement and gref(descriptions,replacement), - value, - comment) -end - -local function report_substitution(feature,lookupname,descriptions,unicode,substitution) - report_prepare("%s: base substitution %s => %S", - cref(feature,lookupname), - gref(descriptions,unicode), - gref(descriptions,substitution)) -end - -local function report_ligature(feature,lookupname,descriptions,unicode,ligature) - report_prepare("%s: base ligature %s => %S", - cref(feature,lookupname), - gref(descriptions,ligature), - gref(descriptions,unicode)) -end - -local function report_kern(feature,lookupname,descriptions,unicode,otherunicode,value) - report_prepare("%s: base kern %s + %s => %S", - cref(feature,lookupname), - gref(descriptions,unicode), - gref(descriptions,otherunicode), - value) -end - -local basemethods = { } -local basemethod = "<unset>" - -local function applybasemethod(what,...) - local m = basemethods[basemethod][what] - if m then - return m(...) - end -end - --- We need to make sure that luatex sees the difference between --- base fonts that have different glyphs in the same slots in fonts --- that have the same fullname (or filename). LuaTeX will merge fonts --- eventually (and subset later on). If needed we can use a more --- verbose name as long as we don't use <()<>[]{}/%> and the length --- is < 128. - -local basehash, basehashes, applied = { }, 1, { } - -local function registerbasehash(tfmdata) - local properties = tfmdata.properties - local hash = concat(applied," ") - local base = basehash[hash] - if not base then - basehashes = basehashes + 1 - base = basehashes - basehash[hash] = base - end - properties.basehash = base - properties.fullname = properties.fullname .. "-" .. base - -- report_prepare("fullname base hash '%a, featureset %a",tfmdata.properties.fullname,hash) - applied = { } -end - -local function registerbasefeature(feature,value) - applied[#applied+1] = feature .. "=" .. tostring(value) -end - --- The original basemode ligature builder used the names of components --- and did some expression juggling to get the chain right. The current --- variant starts with unicodes but still uses names to make the chain. --- This is needed because we have to create intermediates when needed --- but use predefined snippets when available. To some extend the --- current builder is more stupid but I don't worry that much about it --- as ligatures are rather predicatable. --- --- Personally I think that an ff + i == ffi rule as used in for instance --- latin modern is pretty weird as no sane person will key that in and --- expect a glyph for that ligature plus the following character. Anyhow, --- as we need to deal with this, we do, but no guarantes are given. --- --- latin modern dejavu --- --- f+f 102 102 102 102 --- f+i 102 105 102 105 --- f+l 102 108 102 108 --- f+f+i 102 102 105 --- f+f+l 102 102 108 102 102 108 --- ff+i 64256 105 64256 105 --- ff+l 64256 108 --- --- As you can see here, latin modern is less complete than dejavu but --- in practice one will not notice it. --- --- The while loop is needed because we need to resolve for instance --- pseudo names like hyphen_hyphen to endash so in practice we end --- up with a bit too many definitions but the overhead is neglectable. --- --- Todo: if changed[first] or changed[second] then ... end - -local trace = false - -local function finalize_ligatures(tfmdata,ligatures) - local nofligatures = #ligatures - if nofligatures > 0 then - local characters = tfmdata.characters - local descriptions = tfmdata.descriptions - local resources = tfmdata.resources - local unicodes = resources.unicodes - local private = resources.private - local alldone = false - while not alldone do - local done = 0 - for i=1,nofligatures do - local ligature = ligatures[i] - if ligature then - local unicode, lookupdata = ligature[1], ligature[2] - if trace then - trace_ligatures_detail("building % a into %a",lookupdata,unicode) - end - local size = #lookupdata - local firstcode = lookupdata[1] -- [2] - local firstdata = characters[firstcode] - local okay = false - if firstdata then - local firstname = "ctx_" .. firstcode - for i=1,size-1 do -- for i=2,size-1 do - local firstdata = characters[firstcode] - if not firstdata then - firstcode = private - if trace then - trace_ligatures_detail("defining %a as %a",firstname,firstcode) - end - unicodes[firstname] = firstcode - firstdata = { intermediate = true, ligatures = { } } - characters[firstcode] = firstdata - descriptions[firstcode] = { name = firstname } - private = private + 1 - end - local target - local secondcode = lookupdata[i+1] - local secondname = firstname .. "_" .. secondcode - if i == size - 1 then - target = unicode - if not unicodes[secondname] then - unicodes[secondname] = unicode -- map final ligature onto intermediates - end - okay = true - else - target = unicodes[secondname] - if not target then - break - end - end - if trace then - trace_ligatures_detail("codes (%a,%a) + (%a,%a) -> %a",firstname,firstcode,secondname,secondcode,target) - end - local firstligs = firstdata.ligatures - if firstligs then - firstligs[secondcode] = { char = target } - else - firstdata.ligatures = { [secondcode] = { char = target } } - end - firstcode = target - firstname = secondname - end - end - if okay then - ligatures[i] = false - done = done + 1 - end - end - end - alldone = done == 0 - end - if trace then - for k, v in next, characters do - if v.ligatures then table.print(v,k) end - end - end - tfmdata.resources.private = private - end -end - -local function preparesubstitutions(tfmdata,feature,value,validlookups,lookuplist) - local characters = tfmdata.characters - local descriptions = tfmdata.descriptions - local resources = tfmdata.resources - local changed = tfmdata.changed - local unicodes = resources.unicodes - local lookuphash = resources.lookuphash - local lookuptypes = resources.lookuptypes - - local ligatures = { } - local alternate = tonumber(value) - local defaultalt = otf.defaultbasealternate - - local trace_singles = trace_baseinit and trace_singles - local trace_alternatives = trace_baseinit and trace_alternatives - local trace_ligatures = trace_baseinit and trace_ligatures - - local actions = { - substitution = function(lookupdata,lookupname,description,unicode) - if trace_singles then - report_substitution(feature,lookupname,descriptions,unicode,lookupdata) - end - changed[unicode] = lookupdata - end, - alternate = function(lookupdata,lookupname,description,unicode) - local replacement = lookupdata[alternate] - if replacement then - changed[unicode] = replacement - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"normal") - end - elseif defaultalt == "first" then - replacement = lookupdata[1] - changed[unicode] = replacement - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt) - end - elseif defaultalt == "last" then - replacement = lookupdata[#data] - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt) - end - else - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"unknown") - end - end - end, - ligature = function(lookupdata,lookupname,description,unicode) - if trace_ligatures then - report_ligature(feature,lookupname,descriptions,unicode,lookupdata) - end - ligatures[#ligatures+1] = { unicode, lookupdata } - end, - } - - for unicode, character in next, characters do - local description = descriptions[unicode] - local lookups = description.slookups - if lookups then - for l=1,#lookuplist do - local lookupname = lookuplist[l] - local lookupdata = lookups[lookupname] - if lookupdata then - local lookuptype = lookuptypes[lookupname] - local action = actions[lookuptype] - if action then - action(lookupdata,lookupname,description,unicode) - end - end - end - end - local lookups = description.mlookups - if lookups then - for l=1,#lookuplist do - local lookupname = lookuplist[l] - local lookuplist = lookups[lookupname] - if lookuplist then - local lookuptype = lookuptypes[lookupname] - local action = actions[lookuptype] - if action then - for i=1,#lookuplist do - action(lookuplist[i],lookupname,description,unicode) - end - end - end - end - end - end - - finalize_ligatures(tfmdata,ligatures) -end - -local function preparepositionings(tfmdata,feature,value,validlookups,lookuplist) -- todo what kind of kerns, currently all - local characters = tfmdata.characters - local descriptions = tfmdata.descriptions - local resources = tfmdata.resources - local unicodes = resources.unicodes - local sharedkerns = { } - local traceindeed = trace_baseinit and trace_kerns - for unicode, character in next, characters do - local description = descriptions[unicode] - local rawkerns = description.kerns -- shared - if rawkerns then - local s = sharedkerns[rawkerns] - if s == false then - -- skip - elseif s then - character.kerns = s - else - local newkerns = character.kerns - local done = false - for l=1,#lookuplist do - local lookup = lookuplist[l] - local kerns = rawkerns[lookup] - if kerns then - for otherunicode, value in next, kerns do - if value == 0 then - -- maybe no 0 test here - elseif not newkerns then - newkerns = { [otherunicode] = value } - done = true - if traceindeed then - report_kern(feature,lookup,descriptions,unicode,otherunicode,value) - end - elseif not newkerns[otherunicode] then -- first wins - newkerns[otherunicode] = value - done = true - if traceindeed then - report_kern(feature,lookup,descriptions,unicode,otherunicode,value) - end - end - end - end - end - if done then - sharedkerns[rawkerns] = newkerns - character.kerns = newkerns -- no empty assignments - else - sharedkerns[rawkerns] = false - end - end - end - end -end - -basemethods.independent = { - preparesubstitutions = preparesubstitutions, - preparepositionings = preparepositionings, -} - -local function makefake(tfmdata,name,present) - local resources = tfmdata.resources - local private = resources.private - local character = { intermediate = true, ligatures = { } } - resources.unicodes[name] = private - tfmdata.characters[private] = character - tfmdata.descriptions[private] = { name = name } - resources.private = private + 1 - present[name] = private - return character -end - -local function make_1(present,tree,name) - for k, v in next, tree do - if k == "ligature" then - present[name] = v - else - make_1(present,v,name .. "_" .. k) - end - end -end - -local function make_2(present,tfmdata,characters,tree,name,preceding,unicode,done,lookupname) - for k, v in next, tree do - if k == "ligature" then - local character = characters[preceding] - if not character then - if trace_baseinit then - report_prepare("weird ligature in lookup %a, current %C, preceding %C",lookupname,v,preceding) - end - character = makefake(tfmdata,name,present) - end - local ligatures = character.ligatures - if ligatures then - ligatures[unicode] = { char = v } - else - character.ligatures = { [unicode] = { char = v } } - end - if done then - local d = done[lookupname] - if not d then - done[lookupname] = { "dummy", v } - else - d[#d+1] = v - end - end - else - local code = present[name] or unicode - local name = name .. "_" .. k - make_2(present,tfmdata,characters,v,name,code,k,done,lookupname) - end - end -end - -local function preparesubstitutions(tfmdata,feature,value,validlookups,lookuplist) - local characters = tfmdata.characters - local descriptions = tfmdata.descriptions - local resources = tfmdata.resources - local changed = tfmdata.changed - local lookuphash = resources.lookuphash - local lookuptypes = resources.lookuptypes - - local ligatures = { } - local alternate = tonumber(value) - local defaultalt = otf.defaultbasealternate - - local trace_singles = trace_baseinit and trace_singles - local trace_alternatives = trace_baseinit and trace_alternatives - local trace_ligatures = trace_baseinit and trace_ligatures - - for l=1,#lookuplist do - local lookupname = lookuplist[l] - local lookupdata = lookuphash[lookupname] - local lookuptype = lookuptypes[lookupname] - for unicode, data in next, lookupdata do - if lookuptype == "substitution" then - if trace_singles then - report_substitution(feature,lookupname,descriptions,unicode,data) - end - changed[unicode] = data - elseif lookuptype == "alternate" then - local replacement = data[alternate] - if replacement then - changed[unicode] = replacement - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"normal") - end - elseif defaultalt == "first" then - replacement = data[1] - changed[unicode] = replacement - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt) - end - elseif defaultalt == "last" then - replacement = data[#data] - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt) - end - else - if trace_alternatives then - report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"unknown") - end - end - elseif lookuptype == "ligature" then - ligatures[#ligatures+1] = { unicode, data, lookupname } - if trace_ligatures then - report_ligature(feature,lookupname,descriptions,unicode,data) - end - end - end - end - - local nofligatures = #ligatures - - if nofligatures > 0 then - - local characters = tfmdata.characters - local present = { } - local done = trace_baseinit and trace_ligatures and { } - - for i=1,nofligatures do - local ligature = ligatures[i] - local unicode, tree = ligature[1], ligature[2] - make_1(present,tree,"ctx_"..unicode) - end - - for i=1,nofligatures do - local ligature = ligatures[i] - local unicode, tree, lookupname = ligature[1], ligature[2], ligature[3] - make_2(present,tfmdata,characters,tree,"ctx_"..unicode,unicode,unicode,done,lookupname) - end - - end - -end - -local function preparepositionings(tfmdata,feature,value,validlookups,lookuplist) - local characters = tfmdata.characters - local descriptions = tfmdata.descriptions - local resources = tfmdata.resources - local lookuphash = resources.lookuphash - local traceindeed = trace_baseinit and trace_kerns - - -- check out this sharedkerns trickery - - for l=1,#lookuplist do - local lookupname = lookuplist[l] - local lookupdata = lookuphash[lookupname] - for unicode, data in next, lookupdata do - local character = characters[unicode] - local kerns = character.kerns - if not kerns then - kerns = { } - character.kerns = kerns - end - if traceindeed then - for otherunicode, kern in next, data do - if not kerns[otherunicode] and kern ~= 0 then - kerns[otherunicode] = kern - report_kern(feature,lookup,descriptions,unicode,otherunicode,kern) - end - end - else - for otherunicode, kern in next, data do - if not kerns[otherunicode] and kern ~= 0 then - kerns[otherunicode] = kern - end - end - end - end - end - -end - -local function initializehashes(tfmdata) - nodeinitializers.features(tfmdata) -end - -basemethods.shared = { - initializehashes = initializehashes, - preparesubstitutions = preparesubstitutions, - preparepositionings = preparepositionings, -} - -basemethod = "independent" - -local function featuresinitializer(tfmdata,value) - if true then -- value then - local t = trace_preparing and os.clock() - local features = tfmdata.shared.features - if features then - applybasemethod("initializehashes",tfmdata) - local collectlookups = otf.collectlookups - local rawdata = tfmdata.shared.rawdata - local properties = tfmdata.properties - local script = properties.script - local language = properties.language - local basesubstitutions = rawdata.resources.features.gsub - local basepositionings = rawdata.resources.features.gpos - if basesubstitutions then - for feature, data in next, basesubstitutions do - local value = features[feature] - if value then - local validlookups, lookuplist = collectlookups(rawdata,feature,script,language) - if validlookups then - applybasemethod("preparesubstitutions",tfmdata,feature,value,validlookups,lookuplist) - registerbasefeature(feature,value) - end - end - end - end - if basepositionings then - for feature, data in next, basepositionings do - local value = features[feature] - if value then - local validlookups, lookuplist = collectlookups(rawdata,feature,script,language) - if validlookups then - applybasemethod("preparepositionings",tfmdata,feature,features[feature],validlookups,lookuplist) - registerbasefeature(feature,value) - end - end - end - end - registerbasehash(tfmdata) - end - if trace_preparing then - report_prepare("preparation time is %0.3f seconds for %a",os.clock()-t,tfmdata.properties.fullname) - end - end -end - -registerotffeature { - name = "features", - description = "features", - default = true, - initializers = { - -- position = 1, -- after setscript (temp hack ... we need to force script / language to 1 - base = featuresinitializer, - } -} - --- independent : collect lookups independently (takes more runtime ... neglectable) --- shared : shares lookups with node mode (takes more memory unless also a node mode variant is used ... noticeable) - -directives.register("fonts.otf.loader.basemethod", function(v) - if basemethods[v] then - basemethod = v - end -end) +if not modules then modules = { } end modules ['font-otb'] = {
+ version = 1.001,
+ comment = "companion to font-ini.mkiv",
+ 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 lpegmatch = lpeg.match
+local utfchar = utf.char
+
+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_ligatures_detail = false trackers.register("otf.ligatures.detail", function(v) trace_ligatures_detail = 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 report_prepare = logs.reporter("fonts","otf prepare")
+
+local fonts = fonts
+local otf = fonts.handlers.otf
+
+local otffeatures = otf.features
+local registerotffeature = otffeatures.register
+
+otf.defaultbasealternate = "none" -- first last
+
+local wildcard = "*"
+local default = "dflt"
+
+local formatters = string.formatters
+local f_unicode = formatters["%U"]
+local f_uniname = formatters["%U (%s)"]
+local f_unilist = formatters["% t (% t)"]
+
+local function gref(descriptions,n)
+ if type(n) == "number" then
+ local name = descriptions[n].name
+ if name then
+ return f_uniname(n,name)
+ else
+ return f_unicode(n)
+ end
+ elseif n then
+ local num, nam = { }, { }
+ for i=2,#n do
+ local ni = n[i]
+ if tonumber(ni) then -- first is likely a key
+ local di = descriptions[ni]
+ num[i] = f_unicode(ni)
+ nam[i] = di and di.name or "-"
+ end
+ end
+ return f_unilist(num,nam)
+ else
+ return "<error in base mode tracing>"
+ end
+end
+
+local function cref(feature,lookupname)
+ if lookupname then
+ return formatters["feature %a, lookup %a"](feature,lookupname)
+ else
+ return formatters["feature %a"](feature)
+ end
+end
+
+local function report_alternate(feature,lookupname,descriptions,unicode,replacement,value,comment)
+ report_prepare("%s: base alternate %s => %s (%S => %S)",
+ cref(feature,lookupname),
+ gref(descriptions,unicode),
+ replacement and gref(descriptions,replacement),
+ value,
+ comment)
+end
+
+local function report_substitution(feature,lookupname,descriptions,unicode,substitution)
+ report_prepare("%s: base substitution %s => %S",
+ cref(feature,lookupname),
+ gref(descriptions,unicode),
+ gref(descriptions,substitution))
+end
+
+local function report_ligature(feature,lookupname,descriptions,unicode,ligature)
+ report_prepare("%s: base ligature %s => %S",
+ cref(feature,lookupname),
+ gref(descriptions,ligature),
+ gref(descriptions,unicode))
+end
+
+local function report_kern(feature,lookupname,descriptions,unicode,otherunicode,value)
+ report_prepare("%s: base kern %s + %s => %S",
+ cref(feature,lookupname),
+ gref(descriptions,unicode),
+ gref(descriptions,otherunicode),
+ value)
+end
+
+local basemethods = { }
+local basemethod = "<unset>"
+
+local function applybasemethod(what,...)
+ local m = basemethods[basemethod][what]
+ if m then
+ return m(...)
+ end
+end
+
+-- We need to make sure that luatex sees the difference between
+-- base fonts that have different glyphs in the same slots in fonts
+-- that have the same fullname (or filename). LuaTeX will merge fonts
+-- eventually (and subset later on). If needed we can use a more
+-- verbose name as long as we don't use <()<>[]{}/%> and the length
+-- is < 128.
+
+local basehash, basehashes, applied = { }, 1, { }
+
+local function registerbasehash(tfmdata)
+ local properties = tfmdata.properties
+ local hash = concat(applied," ")
+ local base = basehash[hash]
+ if not base then
+ basehashes = basehashes + 1
+ base = basehashes
+ basehash[hash] = base
+ end
+ properties.basehash = base
+ properties.fullname = properties.fullname .. "-" .. base
+ -- report_prepare("fullname base hash '%a, featureset %a",tfmdata.properties.fullname,hash)
+ applied = { }
+end
+
+local function registerbasefeature(feature,value)
+ applied[#applied+1] = feature .. "=" .. tostring(value)
+end
+
+-- The original basemode ligature builder used the names of components
+-- and did some expression juggling to get the chain right. The current
+-- variant starts with unicodes but still uses names to make the chain.
+-- This is needed because we have to create intermediates when needed
+-- but use predefined snippets when available. To some extend the
+-- current builder is more stupid but I don't worry that much about it
+-- as ligatures are rather predicatable.
+--
+-- Personally I think that an ff + i == ffi rule as used in for instance
+-- latin modern is pretty weird as no sane person will key that in and
+-- expect a glyph for that ligature plus the following character. Anyhow,
+-- as we need to deal with this, we do, but no guarantes are given.
+--
+-- latin modern dejavu
+--
+-- f+f 102 102 102 102
+-- f+i 102 105 102 105
+-- f+l 102 108 102 108
+-- f+f+i 102 102 105
+-- f+f+l 102 102 108 102 102 108
+-- ff+i 64256 105 64256 105
+-- ff+l 64256 108
+--
+-- As you can see here, latin modern is less complete than dejavu but
+-- in practice one will not notice it.
+--
+-- The while loop is needed because we need to resolve for instance
+-- pseudo names like hyphen_hyphen to endash so in practice we end
+-- up with a bit too many definitions but the overhead is neglectable.
+--
+-- Todo: if changed[first] or changed[second] then ... end
+
+local trace = false
+
+local function finalize_ligatures(tfmdata,ligatures)
+ local nofligatures = #ligatures
+ if nofligatures > 0 then
+ local characters = tfmdata.characters
+ local descriptions = tfmdata.descriptions
+ local resources = tfmdata.resources
+ local unicodes = resources.unicodes
+ local private = resources.private
+ local alldone = false
+ while not alldone do
+ local done = 0
+ for i=1,nofligatures do
+ local ligature = ligatures[i]
+ if ligature then
+ local unicode, lookupdata = ligature[1], ligature[2]
+ if trace then
+ trace_ligatures_detail("building % a into %a",lookupdata,unicode)
+ end
+ local size = #lookupdata
+ local firstcode = lookupdata[1] -- [2]
+ local firstdata = characters[firstcode]
+ local okay = false
+ if firstdata then
+ local firstname = "ctx_" .. firstcode
+ for i=1,size-1 do -- for i=2,size-1 do
+ local firstdata = characters[firstcode]
+ if not firstdata then
+ firstcode = private
+ if trace then
+ trace_ligatures_detail("defining %a as %a",firstname,firstcode)
+ end
+ unicodes[firstname] = firstcode
+ firstdata = { intermediate = true, ligatures = { } }
+ characters[firstcode] = firstdata
+ descriptions[firstcode] = { name = firstname }
+ private = private + 1
+ end
+ local target
+ local secondcode = lookupdata[i+1]
+ local secondname = firstname .. "_" .. secondcode
+ if i == size - 1 then
+ target = unicode
+ if not unicodes[secondname] then
+ unicodes[secondname] = unicode -- map final ligature onto intermediates
+ end
+ okay = true
+ else
+ target = unicodes[secondname]
+ if not target then
+ break
+ end
+ end
+ if trace then
+ trace_ligatures_detail("codes (%a,%a) + (%a,%a) -> %a",firstname,firstcode,secondname,secondcode,target)
+ end
+ local firstligs = firstdata.ligatures
+ if firstligs then
+ firstligs[secondcode] = { char = target }
+ else
+ firstdata.ligatures = { [secondcode] = { char = target } }
+ end
+ firstcode = target
+ firstname = secondname
+ end
+ end
+ if okay then
+ ligatures[i] = false
+ done = done + 1
+ end
+ end
+ end
+ alldone = done == 0
+ end
+ if trace then
+ for k, v in next, characters do
+ if v.ligatures then table.print(v,k) end
+ end
+ end
+ tfmdata.resources.private = private
+ end
+end
+
+local function preparesubstitutions(tfmdata,feature,value,validlookups,lookuplist)
+ local characters = tfmdata.characters
+ local descriptions = tfmdata.descriptions
+ local resources = tfmdata.resources
+ local changed = tfmdata.changed
+ local unicodes = resources.unicodes
+ local lookuphash = resources.lookuphash
+ local lookuptypes = resources.lookuptypes
+
+ local ligatures = { }
+ local alternate = tonumber(value)
+ local defaultalt = otf.defaultbasealternate
+
+ local trace_singles = trace_baseinit and trace_singles
+ local trace_alternatives = trace_baseinit and trace_alternatives
+ local trace_ligatures = trace_baseinit and trace_ligatures
+
+ local actions = {
+ substitution = function(lookupdata,lookupname,description,unicode)
+ if trace_singles then
+ report_substitution(feature,lookupname,descriptions,unicode,lookupdata)
+ end
+ changed[unicode] = lookupdata
+ end,
+ alternate = function(lookupdata,lookupname,description,unicode)
+ local replacement = lookupdata[alternate]
+ if replacement then
+ changed[unicode] = replacement
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"normal")
+ end
+ elseif defaultalt == "first" then
+ replacement = lookupdata[1]
+ changed[unicode] = replacement
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt)
+ end
+ elseif defaultalt == "last" then
+ replacement = lookupdata[#data]
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt)
+ end
+ else
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"unknown")
+ end
+ end
+ end,
+ ligature = function(lookupdata,lookupname,description,unicode)
+ if trace_ligatures then
+ report_ligature(feature,lookupname,descriptions,unicode,lookupdata)
+ end
+ ligatures[#ligatures+1] = { unicode, lookupdata }
+ end,
+ }
+
+ for unicode, character in next, characters do
+ local description = descriptions[unicode]
+ local lookups = description.slookups
+ if lookups then
+ for l=1,#lookuplist do
+ local lookupname = lookuplist[l]
+ local lookupdata = lookups[lookupname]
+ if lookupdata then
+ local lookuptype = lookuptypes[lookupname]
+ local action = actions[lookuptype]
+ if action then
+ action(lookupdata,lookupname,description,unicode)
+ end
+ end
+ end
+ end
+ local lookups = description.mlookups
+ if lookups then
+ for l=1,#lookuplist do
+ local lookupname = lookuplist[l]
+ local lookuplist = lookups[lookupname]
+ if lookuplist then
+ local lookuptype = lookuptypes[lookupname]
+ local action = actions[lookuptype]
+ if action then
+ for i=1,#lookuplist do
+ action(lookuplist[i],lookupname,description,unicode)
+ end
+ end
+ end
+ end
+ end
+ end
+
+ finalize_ligatures(tfmdata,ligatures)
+end
+
+local function preparepositionings(tfmdata,feature,value,validlookups,lookuplist) -- todo what kind of kerns, currently all
+ local characters = tfmdata.characters
+ local descriptions = tfmdata.descriptions
+ local resources = tfmdata.resources
+ local unicodes = resources.unicodes
+ local sharedkerns = { }
+ local traceindeed = trace_baseinit and trace_kerns
+ for unicode, character in next, characters do
+ local description = descriptions[unicode]
+ local rawkerns = description.kerns -- shared
+ if rawkerns then
+ local s = sharedkerns[rawkerns]
+ if s == false then
+ -- skip
+ elseif s then
+ character.kerns = s
+ else
+ local newkerns = character.kerns
+ local done = false
+ for l=1,#lookuplist do
+ local lookup = lookuplist[l]
+ local kerns = rawkerns[lookup]
+ if kerns then
+ for otherunicode, value in next, kerns do
+ if value == 0 then
+ -- maybe no 0 test here
+ elseif not newkerns then
+ newkerns = { [otherunicode] = value }
+ done = true
+ if traceindeed then
+ report_kern(feature,lookup,descriptions,unicode,otherunicode,value)
+ end
+ elseif not newkerns[otherunicode] then -- first wins
+ newkerns[otherunicode] = value
+ done = true
+ if traceindeed then
+ report_kern(feature,lookup,descriptions,unicode,otherunicode,value)
+ end
+ end
+ end
+ end
+ end
+ if done then
+ sharedkerns[rawkerns] = newkerns
+ character.kerns = newkerns -- no empty assignments
+ else
+ sharedkerns[rawkerns] = false
+ end
+ end
+ end
+ end
+end
+
+basemethods.independent = {
+ preparesubstitutions = preparesubstitutions,
+ preparepositionings = preparepositionings,
+}
+
+local function makefake(tfmdata,name,present)
+ local resources = tfmdata.resources
+ local private = resources.private
+ local character = { intermediate = true, ligatures = { } }
+ resources.unicodes[name] = private
+ tfmdata.characters[private] = character
+ tfmdata.descriptions[private] = { name = name }
+ resources.private = private + 1
+ present[name] = private
+ return character
+end
+
+local function make_1(present,tree,name)
+ for k, v in next, tree do
+ if k == "ligature" then
+ present[name] = v
+ else
+ make_1(present,v,name .. "_" .. k)
+ end
+ end
+end
+
+local function make_2(present,tfmdata,characters,tree,name,preceding,unicode,done,lookupname)
+ for k, v in next, tree do
+ if k == "ligature" then
+ local character = characters[preceding]
+ if not character then
+ if trace_baseinit then
+ report_prepare("weird ligature in lookup %a, current %C, preceding %C",lookupname,v,preceding)
+ end
+ character = makefake(tfmdata,name,present)
+ end
+ local ligatures = character.ligatures
+ if ligatures then
+ ligatures[unicode] = { char = v }
+ else
+ character.ligatures = { [unicode] = { char = v } }
+ end
+ if done then
+ local d = done[lookupname]
+ if not d then
+ done[lookupname] = { "dummy", v }
+ else
+ d[#d+1] = v
+ end
+ end
+ else
+ local code = present[name] or unicode
+ local name = name .. "_" .. k
+ make_2(present,tfmdata,characters,v,name,code,k,done,lookupname)
+ end
+ end
+end
+
+local function preparesubstitutions(tfmdata,feature,value,validlookups,lookuplist)
+ local characters = tfmdata.characters
+ local descriptions = tfmdata.descriptions
+ local resources = tfmdata.resources
+ local changed = tfmdata.changed
+ local lookuphash = resources.lookuphash
+ local lookuptypes = resources.lookuptypes
+
+ local ligatures = { }
+ local alternate = tonumber(value)
+ local defaultalt = otf.defaultbasealternate
+
+ local trace_singles = trace_baseinit and trace_singles
+ local trace_alternatives = trace_baseinit and trace_alternatives
+ local trace_ligatures = trace_baseinit and trace_ligatures
+
+ for l=1,#lookuplist do
+ local lookupname = lookuplist[l]
+ local lookupdata = lookuphash[lookupname]
+ local lookuptype = lookuptypes[lookupname]
+ for unicode, data in next, lookupdata do
+ if lookuptype == "substitution" then
+ if trace_singles then
+ report_substitution(feature,lookupname,descriptions,unicode,data)
+ end
+ changed[unicode] = data
+ elseif lookuptype == "alternate" then
+ local replacement = data[alternate]
+ if replacement then
+ changed[unicode] = replacement
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"normal")
+ end
+ elseif defaultalt == "first" then
+ replacement = data[1]
+ changed[unicode] = replacement
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt)
+ end
+ elseif defaultalt == "last" then
+ replacement = data[#data]
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,defaultalt)
+ end
+ else
+ if trace_alternatives then
+ report_alternate(feature,lookupname,descriptions,unicode,replacement,value,"unknown")
+ end
+ end
+ elseif lookuptype == "ligature" then
+ ligatures[#ligatures+1] = { unicode, data, lookupname }
+ if trace_ligatures then
+ report_ligature(feature,lookupname,descriptions,unicode,data)
+ end
+ end
+ end
+ end
+
+ local nofligatures = #ligatures
+
+ if nofligatures > 0 then
+
+ local characters = tfmdata.characters
+ local present = { }
+ local done = trace_baseinit and trace_ligatures and { }
+
+ for i=1,nofligatures do
+ local ligature = ligatures[i]
+ local unicode, tree = ligature[1], ligature[2]
+ make_1(present,tree,"ctx_"..unicode)
+ end
+
+ for i=1,nofligatures do
+ local ligature = ligatures[i]
+ local unicode, tree, lookupname = ligature[1], ligature[2], ligature[3]
+ make_2(present,tfmdata,characters,tree,"ctx_"..unicode,unicode,unicode,done,lookupname)
+ end
+
+ end
+
+end
+
+local function preparepositionings(tfmdata,feature,value,validlookups,lookuplist)
+ local characters = tfmdata.characters
+ local descriptions = tfmdata.descriptions
+ local resources = tfmdata.resources
+ local lookuphash = resources.lookuphash
+ local traceindeed = trace_baseinit and trace_kerns
+
+ -- check out this sharedkerns trickery
+
+ for l=1,#lookuplist do
+ local lookupname = lookuplist[l]
+ local lookupdata = lookuphash[lookupname]
+ for unicode, data in next, lookupdata do
+ local character = characters[unicode]
+ local kerns = character.kerns
+ if not kerns then
+ kerns = { }
+ character.kerns = kerns
+ end
+ if traceindeed then
+ for otherunicode, kern in next, data do
+ if not kerns[otherunicode] and kern ~= 0 then
+ kerns[otherunicode] = kern
+ report_kern(feature,lookup,descriptions,unicode,otherunicode,kern)
+ end
+ end
+ else
+ for otherunicode, kern in next, data do
+ if not kerns[otherunicode] and kern ~= 0 then
+ kerns[otherunicode] = kern
+ end
+ end
+ end
+ end
+ end
+
+end
+
+local function initializehashes(tfmdata)
+ nodeinitializers.features(tfmdata)
+end
+
+basemethods.shared = {
+ initializehashes = initializehashes,
+ preparesubstitutions = preparesubstitutions,
+ preparepositionings = preparepositionings,
+}
+
+basemethod = "independent"
+
+local function featuresinitializer(tfmdata,value)
+ if true then -- value then
+ local t = trace_preparing and os.clock()
+ local features = tfmdata.shared.features
+ if features then
+ applybasemethod("initializehashes",tfmdata)
+ local collectlookups = otf.collectlookups
+ local rawdata = tfmdata.shared.rawdata
+ local properties = tfmdata.properties
+ local script = properties.script
+ local language = properties.language
+ local basesubstitutions = rawdata.resources.features.gsub
+ local basepositionings = rawdata.resources.features.gpos
+ if basesubstitutions then
+ for feature, data in next, basesubstitutions do
+ local value = features[feature]
+ if value then
+ local validlookups, lookuplist = collectlookups(rawdata,feature,script,language)
+ if validlookups then
+ applybasemethod("preparesubstitutions",tfmdata,feature,value,validlookups,lookuplist)
+ registerbasefeature(feature,value)
+ end
+ end
+ end
+ end
+ if basepositionings then
+ for feature, data in next, basepositionings do
+ local value = features[feature]
+ if value then
+ local validlookups, lookuplist = collectlookups(rawdata,feature,script,language)
+ if validlookups then
+ applybasemethod("preparepositionings",tfmdata,feature,features[feature],validlookups,lookuplist)
+ registerbasefeature(feature,value)
+ end
+ end
+ end
+ end
+ registerbasehash(tfmdata)
+ end
+ if trace_preparing then
+ report_prepare("preparation time is %0.3f seconds for %a",os.clock()-t,tfmdata.properties.fullname)
+ end
+ end
+end
+
+registerotffeature {
+ name = "features",
+ description = "features",
+ default = true,
+ initializers = {
+ -- position = 1, -- after setscript (temp hack ... we need to force script / language to 1
+ base = featuresinitializer,
+ }
+}
+
+-- independent : collect lookups independently (takes more runtime ... neglectable)
+-- shared : shares lookups with node mode (takes more memory unless also a node mode variant is used ... noticeable)
+
+directives.register("fonts.otf.loader.basemethod", function(v)
+ if basemethods[v] then
+ basemethod = v
+ end
+end)
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