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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 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
-- needs checking: some added features can pass twice
local P, C, Cc, lpegmatch = lpeg.P, lpeg.C, lpeg.Cc, lpeg.match
local pattern = P("always") * (P(-1) * Cc(true) + P(":") * C((1-P(-1))^1))
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 valid = type(e_e) == "string" and lpegmatch(pattern,e_e)
if valid then
-- we have hit always
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,"*","*",sequence.name,valid)
end
ra[#ra+1] = { valid, attribute, sequence, kind }
else
-- we already checked for e_e
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
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
-- just return nil or ra step
initialize(sequences[s],script,language,s_enabled,a_enabled,font,attr,dynamic,ra,autoscript,autolanguage)
end
end
end
return ra
end
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