diff options
| -rw-r--r-- | src/luaotfload-features.lua | 146 |
1 files changed, 145 insertions, 1 deletions
diff --git a/src/luaotfload-features.lua b/src/luaotfload-features.lua index 322a020..d212df5 100644 --- a/src/luaotfload-features.lua +++ b/src/luaotfload-features.lua @@ -970,7 +970,147 @@ local noflags = { } local tohash = table.tohash -local function addfeature(data,feature,specifications) +local function ancient_addfeature (data, feature, specifications) + local descriptions = data.descriptions + local resources = data.resources + local lookups = resources.lookups + local gsubfeatures = resources.features.gsub + if gsubfeatures and gsubfeatures[feature] then + -- already present + else + local sequences = resources.sequences + local fontfeatures = resources.features + local unicodes = resources.unicodes + local lookuptypes = resources.lookuptypes + local splitter = lpeg.splitter(" ",unicodes) + local done = 0 + local skip = 0 + if not specifications[1] then + -- so we accept a one entry specification + specifications = { specifications } + end + -- subtables are tables themselves but we also accept flattened singular subtables + for s=1,#specifications do + local specification = specifications[s] + local valid = specification.valid + if not valid or valid(data,specification,feature) then + local initialize = specification.initialize + if initialize then + -- when false is returned we initialize only once + specification.initialize = initialize(specification) and initialize or nil + end + local askedfeatures = specification.features or everywhere + local subtables = specification.subtables or { specification.data } or { } + local featuretype = types[specification.type or "substitution"] + local featureflags = specification.flags or noflags + local featureorder = specification.order or { feature } + local added = false + local featurename = stringformat("ctx_%s_%s",feature,s) + local st = { } + for t=1,#subtables do + local list = subtables[t] + local full = stringformat("%s_%s",featurename,t) + st[t] = full + if featuretype == "gsub_ligature" then + lookuptypes[full] = "ligature" + for code, ligature in next, list do + local unicode = tonumber(code) or unicodes[code] + local description = descriptions[unicode] + if description then + local slookups = description.slookups + if type(ligature) == "string" then + ligature = { lpegmatch(splitter,ligature) } + end + local present = true + for i=1,#ligature do + if not descriptions[ligature[i]] then + present = false + break + end + end + if present then + if slookups then + slookups[full] = ligature + else + description.slookups = { [full] = ligature } + end + done, added = done + 1, true + else + skip = skip + 1 + end + end + end + elseif featuretype == "gsub_single" then + lookuptypes[full] = "substitution" + for code, replacement in next, list do + local unicode = tonumber(code) or unicodes[code] + local description = descriptions[unicode] + if description then + local slookups = description.slookups + replacement = tonumber(replacement) or unicodes[replacement] + if descriptions[replacement] then + if slookups then + slookups[full] = replacement + else + description.slookups = { [full] = replacement } + end + done, added = done + 1, true + end + end + end + end + end + if added then + -- script = { lang1, lang2, lang3 } or script = { lang1 = true, ... } + for k, v in next, askedfeatures do + if v[1] then + askedfeatures[k] = tabletohash(v) + end + end + local sequence = { + chain = 0, + features = { [feature] = askedfeatures }, + flags = featureflags, + name = featurename, + order = featureorder, + subtables = st, + type = featuretype, + } + if specification.prepend then + insert(sequences,1,sequence) + else + insert(sequences,sequence) + end + -- 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 + end + if trace_loading then + report_otf("registering feature %a, affected glyphs %a, skipped glyphs %a",feature,done,skip) + end + end +end + +local function current_addfeature(data,feature,specifications) local descriptions = data.descriptions local resources = data.resources local features = resources.features @@ -1344,6 +1484,10 @@ return { anum = anum_specification, } + --- hack for backwards compat with TL2014 loader + local addfeature = otf.version < 2.8 and current_addfeature + or ancient_addfeature + otf.enhancers.register ("check extra features", function (data, filename, raw) for feature, specification in next, extrafeatures do |