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-rw-r--r--src/luaotfload-features.lua379
1 files changed, 253 insertions, 126 deletions
diff --git a/src/luaotfload-features.lua b/src/luaotfload-features.lua
index 962806c..bcf9968 100644
--- a/src/luaotfload-features.lua
+++ b/src/luaotfload-features.lua
@@ -946,146 +946,273 @@ local types = {
setmetatableindex(types, function(t,k) t[k] = k return k end) -- "key"
+--- start locals for addfeature()
+
+local otf = handlers and handlers.otf --- filled in later during initialization
+
+local normalized = {
+ substitution = "substitution",
+ single = "substitution",
+ ligature = "ligature",
+ alternate = "alternate",
+ multiple = "multiple",
+ kern = "kern",
+}
+
+local types = {
+ substitution = "gsub_single",
+ ligature = "gsub_ligature",
+ alternate = "gsub_alternate",
+ multiple = "gsub_multiple",
+ kern = "gpos_pair",
+}
+
+--- stop locals for addfeature()
+
local everywhere = { ["*"] = { ["*"] = true } } -- or: { ["*"] = { "*" } }
-local noflags = { }
+local noflags = { }
-local function addfeature (data, feature, specifications)
+local function addfeature(data,feature,specifications)
local descriptions = data.descriptions
local resources = data.resources
- local lookups = resources.lookups
- local gsubfeatures = resources.features.gsub
+ local features = resources.features
+ local sequences = resources.sequences
+ if not features or not sequences then
+ return
+ end
+ local gsubfeatures = 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 }
+ return -- already present
+ end
+ local fontfeatures = resources.features or everywhere
+ local unicodes = resources.unicodes
+ 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
+
+ local function tounicode(code)
+ if not code then
+ return
+ elseif type(code) == "number" then
+ return code
+ else
+ return unicodes[code] or utfbyte(code)
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
+ end
+
+ local coverup = otf.coverup
+ local coveractions = coverup.actions
+ local stepkey = coverup.stepkey
+ local register = coverup.register
+
+ 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,data) and initialize or nil
+ end
+ local askedfeatures = specification.features or everywhere
+ local askedsteps = specifications.steps or specification.subtables or { specification.data } or { }
+ local featuretype = normalized[specification.type or "substitution"] or "substitution"
+ local featureflags = specification.flags or noflags
+ local featureorder = specification.order or { feature }
+ local added = false
+ local nofsteps = 0
+ local steps = { }
+ for i=1,#askedsteps do
+ local list = askedsteps[i]
+ local coverage = { }
+ local cover = coveractions[featuretype]
+ local format = nil
+ if not cover then
+ -- unknown
+ elseif featuretype == "substitution" then
+ for code, replacement in next, list do
+ local unicode = tounicode(code)
+ local description = descriptions[unicode]
+ if description then
+ if type(replacement) == "table" then
+ replacement = replacement[1]
+ end
+ replacement = tounicode(replacement)
+ if replacement and descriptions[replacement] then
+ cover(coverage,unicode,replacement)
+ done = done + 1
+ else
+ skip = skip + 1
+ end
+ else
+ skip = skip + 1
+ end
+ end
+ elseif featuretype == "ligature" then
+ for code, ligature in next, list do
+ local unicode = tounicode(code)
+ local description = descriptions[unicode]
+ if description then
+ if type(ligature) == "string" then
+ ligature = { lpegmatch(splitter,ligature) }
+ end
+ local present = true
+ for i=1,#ligature do
+ local l = ligature[i]
+ local u = tounicode(l)
+ if descriptions[u] then
+ ligature[i] = u
else
- skip = skip + 1
+ present = false
+ break
end
end
+ if present then
+ cover(coverage,unicode,ligature)
+ done = done + 1
+ else
+ skip = skip + 1
+ end
+ else
+ skip = skip + 1
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
+ elseif featuretype == "alternate" then
+ for code, replacement in next, list do
+ local unicode = tounicode(code)
+ local description = descriptions[unicode]
+ if not description then
+ skip = skip + 1
+ elseif type(replacement) == "table" then
+ local r = { }
+ for i=1,#replacement do
+ local u = tounicode(replacement[i])
+ r[i] = descriptions[u] and u or unicode
+ end
+ cover(coverage,unicode,r)
+ done = done + 1
+ else
+ local u = tounicode(replacement)
+ if u then
+ cover(coverage,unicode,{ u })
+ done = done + 1
+ else
+ skip = skip + 1
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)
+ elseif featuretype == "multiple" then -- todo: unicode can be table
+ for code, replacement in next, list do
+ local unicode = tounicode(code)
+ local description = descriptions[unicode]
+ if not description then
+ skip = skip + 1
+ elseif type(replacement) == "table" then
+ local r, n = { }, 0
+ for i=1,#replacement do
+ local u = tounicode(replacement[i])
+ if descriptions[u] then
+ n = n + 1
+ r[n] = u
+ end
+ end
+ if n > 0 then
+ cover(coverage,unicode,r)
+ done = done + 1
+ else
+ skip = skip + 1
+ end
+ else
+ local u = tounicode(replacement)
+ if u then
+ cover(coverage,unicode,{ u })
+ done = done + 1
+ else
+ skip = skip + 1
+ end
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)
+ elseif featuretype == "kern" then
+ for code, replacement in next, list do
+ local unicode = tounicode(code)
+ local description = descriptions[unicode]
+ if description and type(replacement) == "table" then
+ local r = { }
+ for k, v in next, replacement do
+ local u = tounicode(k)
+ if u then
+ r[u] = v
+ end
+ end
+ if next(r) then
+ cover(coverage,unicode,r)
+ done = done + 1
+ else
+ skip = skip + 1
+ end
+ else
+ skip = skip + 1
+ end
end
- -- register in metadata (merge as there can be a few)
- if not gsubfeatures then
- gsubfeatures = { }
- fontfeatures.gsub = gsubfeatures
+ format = "kern"
+ end
+ if next(coverage) then
+ added = true
+ nofsteps = nofsteps + 1
+ steps[nofsteps] = register(coverage,featuretype,format,feature,nofsteps,descriptions,resources)
+ 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] = table.tohash(v)
end
- local k = gsubfeatures[feature]
- if not k then
- k = { }
- gsubfeatures[feature] = k
+ end
+ local sequence = {
+ chain = 0,
+ features = { [feature] = askedfeatures },
+ flags = featureflags,
+ name = feature, -- not needed
+ order = featureorder,
+ [stepkey] = steps,
+ nofsteps = nofsteps,
+ type = types[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 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
+ for language, value in next, languages do
+ kk[language] = value
end
end
end
end
- if trace_loading then
- report_otf("registering feature %a, affected glyphs %a, skipped glyphs %a",feature,done,skip)
- end
+ end
+ if trace_loading then
+ report_otf("registering feature %a, affected glyphs %a, skipped glyphs %a",feature,done,skip)
end
end
@@ -1097,10 +1224,10 @@ local tlig_specification = {
features = everywhere,
data = {
[0x0022] = 0x201D, -- quotedblright
- [0x0027] = 0x2019, -- quoteleft
- [0x0060] = 0x2018, -- quoteright
+ --[0x0027] = 0x2019, -- quoteleft
+ --[0x0060] = 0x2018, -- quoteright
},
- flags = { },
+ flags = no_flags,
order = { "tlig" },
prepend = true,
},
@@ -1120,7 +1247,7 @@ local tlig_specification = {
[0x00AB] = {0x003C, 0x003C}, -- LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
[0x00BB] = {0x003E, 0x003E}, -- RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
},
- flags = { },
+ flags = no_flags,
order = { "tlig" },
prepend = true,
},
@@ -1133,7 +1260,7 @@ local tlig_specification = {
[0x00A1] = {0x0021, 0x0060}, -- exclamdown
[0x00BF] = {0x003F, 0x0060}, -- questiondown
},
- flags = { },
+ flags = no_flags,
order = { "tlig" },
prepend = true,
},
@@ -1183,7 +1310,7 @@ local anum_specification = {
type = "substitution",
features = { arab = { far = true, urd = true, snd = true } },
data = anum_persian,
- flags = { },
+ flags = no_flags,
order = { "anum" },
valid = valid,
},
@@ -1191,7 +1318,7 @@ local anum_specification = {
type = "substitution",
features = { arab = { ["*"] = true } },
data = anum_arabic,
- flags = { },
+ flags = no_flags,
order = { "anum" },
valid = valid,
},
@@ -1207,7 +1334,7 @@ return {
return false
end
- local otf = fonts.handlers.otf
+ otf = fonts.handlers.otf
local extrafeatures = {
tlig = tlig_specification,