diff options
Diffstat (limited to 'src/fontloader/misc/fontloader-font-otd.lua')
| -rw-r--r-- | src/fontloader/misc/fontloader-font-otd.lua | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/src/fontloader/misc/fontloader-font-otd.lua b/src/fontloader/misc/fontloader-font-otd.lua new file mode 100644 index 0000000..db041c7 --- /dev/null +++ b/src/fontloader/misc/fontloader-font-otd.lua @@ -0,0 +1,251 @@ +if not modules then modules = { } end modules ['font-otd'] = { + 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 type = type +local match = string.match +local sequenced = table.sequenced + +local trace_dynamics = false trackers.register("otf.dynamics", function(v) trace_dynamics = v end) +local trace_applied = false trackers.register("otf.applied", function(v) trace_applied = v end) + +local report_otf = logs.reporter("fonts","otf loading") +local report_process = logs.reporter("fonts","otf process") + +local allocate = utilities.storage.allocate + +local fonts = fonts +local otf = fonts.handlers.otf +local hashes = fonts.hashes +local definers = fonts.definers +local constructors = fonts.constructors +local specifiers = fonts.specifiers + +local fontidentifiers = hashes.identifiers +local fontresources = hashes.resources +local fontproperties = hashes.properties +local fontdynamics = hashes.dynamics + +local contextsetups = specifiers.contextsetups +local contextnumbers = specifiers.contextnumbers +local contextmerged = specifiers.contextmerged + +local setmetatableindex = table.setmetatableindex + +local otffeatures = fonts.constructors.newfeatures("otf") +local registerotffeature = otffeatures.register + +local a_to_script = { } +local a_to_language = { } + +-- we can have a scripts hash in fonts.hashes + +function otf.setdynamics(font,attribute) + -- local features = contextsetups[contextnumbers[attribute]] -- can be moved to caller + local features = contextsetups[attribute] + if features then + local dynamics = fontdynamics[font] + dynamic = contextmerged[attribute] or 0 + local script, language + if dynamic == 2 then -- merge + language = features.language or fontproperties[font].language or "dflt" + script = features.script or fontproperties[font].script or "dflt" + else -- if dynamic == 1 then -- replace + language = features.language or "dflt" + script = features.script or "dflt" + end + if script == "auto" then + -- checkedscript and resources are defined later so we cannot shortcut them -- todo: make installer + script = definers.checkedscript(fontidentifiers[font],fontresources[font],features) + end + local ds = dynamics[script] -- can be metatable magic (less testing) +-- or dynamics.dflt + if not ds then + ds = { } + dynamics[script] = ds + end + local dsl = ds[language] +-- or ds.dflt + if not dsl then + dsl = { } + ds[language] = dsl + end + local dsla = dsl[attribute] + if not dsla then + local tfmdata = fontidentifiers[font] + a_to_script [attribute] = script + a_to_language[attribute] = language + -- we need to save some values .. quite messy + local properties = tfmdata.properties + local shared = tfmdata.shared + local s_script = properties.script + local s_language = properties.language + local s_mode = properties.mode + local s_features = shared.features + properties.mode = "node" + properties.language = language + properties.script = script + properties.dynamics = true -- handy for tracing + shared.features = { } + -- end of save + local set = constructors.checkedfeatures("otf",features) + set.mode = "node" -- really needed + dsla = otf.setfeatures(tfmdata,set) + if trace_dynamics then + report_otf("setting dynamics %s: attribute %a, script %a, language %a, set %a",contextnumbers[attribute],attribute,script,language,set) + end + -- we need to restore some values + properties.script = s_script + properties.language = s_language + properties.mode = s_mode + shared.features = s_features + -- end of restore + dynamics[script][language][attribute] = dsla -- cache + elseif trace_dynamics then + -- report_otf("using dynamics %s: attribute %a, script %a, language %a",contextnumbers[attribute],attribute,script,language) + end + return dsla + end +end + +function otf.scriptandlanguage(tfmdata,attr) + local properties = tfmdata.properties + if attr and attr > 0 then + return a_to_script[attr] or properties.script or "dflt", a_to_language[attr] or properties.language or "dflt" + else + return properties.script or "dflt", properties.language or "dflt" + end +end + +-- we reimplement the dataset resolver + +local autofeatures = fonts.analyzers.features +local featuretypes = otf.tables.featuretypes +local defaultscript = otf.features.checkeddefaultscript +local defaultlanguage = otf.features.checkeddefaultlanguage + +local resolved = { } -- we only resolve a font,script,language,attribute pair once +local wildcard = "*" + +-- what about analyze in local and not in font + +local function initialize(sequence,script,language,s_enabled,a_enabled,font,attr,dynamic,ra,autoscript,autolanguage) + local features = sequence.features + if features then + local order = sequence.order + if order then + local featuretype = featuretypes[sequence.type or "unknown"] + for i=1,#order do -- + local kind = order[i] -- + local e_e + local a_e = a_enabled and a_enabled[kind] -- the value (location) + if a_e ~= nil then + e_e = a_e + else + e_e = s_enabled and s_enabled[kind] -- the value (font) + end + if e_e then + local scripts = features[kind] -- + local languages = scripts[script] or scripts[wildcard] + if not languages and autoscript then + langages = defaultscript(featuretype,autoscript,scripts) + end + if languages then + -- we need detailed control over default becase we want to trace + -- only first attribute match check, so we assume simple fina's + local valid = false + if languages[language] then + valid = e_e + elseif languages[wildcard] then + valid = e_e + elseif autolanguage and defaultlanguage(featuretype,autolanguage,languages) then + valid = e_e + end + if valid then + local attribute = autofeatures[kind] or false + if trace_applied then + report_process( + "font %s, dynamic %a (%a), feature %a, script %a, language %a, lookup %a, value %a", + font,attr or 0,dynamic,kind,script,language,sequence.name,valid) + end + ra[#ra+1] = { valid, attribute, sequence, kind } + end + end + end + end + end + end +end + +-- there is some fuzzy language/script state stuff in properties (temporary) + +function otf.dataset(tfmdata,font,attr) -- attr only when explicit (as in special parbuilder) + + local script, language, s_enabled, a_enabled, dynamic + + if attr and attr ~= 0 then + dynamic = contextmerged[attr] or 0 + -- local features = contextsetups[contextnumbers[attr]] -- could be a direct list + local features = contextsetups[attr] + a_enabled = features -- location based + if dynamic == 1 then -- or dynamic == -1 then + -- replace + language = features.language or "dflt" + script = features.script or "dflt" + elseif dynamic == 2 then -- or dynamic == -2 then + -- merge + local properties = tfmdata.properties + s_enabled = tfmdata.shared.features -- font based + language = features.language or properties.language or "dflt" + script = features.script or properties.script or "dflt" + else + -- error + local properties = tfmdata.properties + language = properties.language or "dflt" + script = properties.script or "dflt" + end + else + local properties = tfmdata.properties + language = properties.language or "dflt" + script = properties.script or "dflt" + s_enabled = tfmdata.shared.features -- can be made local to the resolver + dynamic = 0 + end + + local res = resolved[font] + if not res then + res = { } + resolved[font] = res + end + local rs = res[script] + if not rs then + rs = { } + res[script] = rs + end + local rl = rs[language] + if not rl then + rl = { } + rs[language] = rl + end + local ra = rl[attr] + if ra == nil then -- attr can be false + ra = { + -- indexed but we can also add specific data by key in: + } + rl[attr] = ra + local sequences = tfmdata.resources.sequences + if sequences then + local autoscript = (s_enabled and s_enabled.autoscript ) or (a_enabled and a_enabled.autoscript ) + local autolanguage = (s_enabled and s_enabled.autolanguage) or (a_enabled and a_enabled.autolanguage) + for s=1,#sequences do + initialize(sequences[s],script,language,s_enabled,a_enabled,font,attr,dynamic,ra,autoscript,autolanguage) + end + end + end + return ra + +end |