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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 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 fonts = fonts
local otf = fonts.handlers.otf
local hashes = fonts.hashes
local definers = fonts.definers
local constructors = fonts.constructors
local specifiers = fonts.specifiers
local fontdata = hashes.identifiers
----- fontresources = hashes.resources -- not yet defined
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 fontdynamics = { }
hashes.dynamics = fontdynamics
local a_to_script = { }
local a_to_language = { }
setmetatableindex(fontdynamics, function(t,font)
local d = fontdata[font].shared.dynamics or false
t[font] = d
return d
end)
function otf.setdynamics(font,attribute)
local features = contextsetups[contextnumbers[attribute]] -- can be moved to caller
if features then
local dynamics = fontdynamics[font]
local script = features.script or 'dflt'
local language = features.language or 'dflt'
if script == "auto" then
-- checkedscript and resources are defined later so we cannot shortcut them
script = definers.checkedscript(fontdata[font],hashes.resources[font],features)
end
local ds = dynamics[script] -- can be metatable magic (less testing)
if not ds then
ds = { }
dynamics[script] = ds
end
local dsl = ds[language]
if not dsl then
dsl = { }
ds[language] = dsl
end
local dsla = dsl[attribute]
if not dsla then
local tfmdata = fontdata[font]
a_to_script [attribute] = script
a_to_language[attribute] = language
-- we need to save some values
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 %s, script %s, language %s, set: %s",contextnumbers[attribute],attribute,script,language,sequenced(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 %s, script %s, language %s",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 special_attributes = {
init = 1,
medi = 2,
fina = 3,
isol = 4
}
local resolved = { } -- we only resolve a font,script,language,attribute pair once
local wildcard = "*"
local default = "dflt"
local function initialize(sequence,script,language,s_enabled,a_enabled,font,attr,dynamic)
local features = sequence.features
if features then
for kind, scripts in next, features do
local s_e = s_enabled and s_enabled[kind] -- the value
local a_e = a_enabled and a_enabled[kind] -- the value
local e_e = s_e or a_e -- todo: when one of them is true and the other is a value
if e_e then
local languages = scripts[script] or scripts[wildcard]
if languages then
local valid, what = false
-- not languages[language] or languages[default] or languages[wildcard] because we want tracing
-- only first attribute match check, so we assume simple fina's
-- default can become a font feature itself
if languages[language] then
valid = e_e -- was true
what = language
-- elseif languages[default] then
-- valid = true
-- what = default
elseif languages[wildcard] then
valid = e_e -- was true
what = wildcard
end
if valid then
local attribute = special_attributes[kind] or false
if a_e and dynamic < 0 then
valid = false
end
if trace_applied then
local typ, action = match(sequence.type,"(.*)_(.*)") -- brrr
report_process(
"%s font: %03i, dynamic: %03i, kind: %s, script: %-4s, language: %-4s (%-4s), type: %s, action: %s, name: %s",
(valid and "+") or "-",font,attr or 0,kind,script,language,what,typ,action,sequence.name)
end
return { valid, attribute, sequence.chain or 0, kind, sequence }
end
end
end
end
return false -- { valid, attribute, chain, "generic", sequence } -- false anyway, could be flag instead of table
else
return false -- { false, false, chain, false, sequence } -- indirect lookup, part of chain (todo: make this a separate table)
end
end
-- local contextresolved = { }
--
-- setmetatableindex(contextresolved, function(t,k)
-- local v = contextsetups[contextnumbers[k]]
-- t[k] = v
-- return v
-- end)
function otf.dataset(tfmdata,sequences,font,attr) -- attr only when explicit (as in special parbuilder)
local script, language, s_enabled, a_enabled, dynamic
if attr and attr ~= 0 then
local features = contextsetups[contextnumbers[attr]] -- could be a direct list
-- local features = contextresolved[attr]
language = features.language or "dflt"
script = features.script or "dflt"
a_enabled = features
dynamic = contextmerged[attr] or 0
if dynamic == 2 or dynamic == -2 then
-- font based
s_enabled = tfmdata.shared.features
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 = { }
rl[attr] = ra
setmetatableindex(ra, function(t,k)
local v = initialize(sequences[k],script,language,s_enabled,a_enabled,font,attr,dynamic)
t[k] = v or false
return v
end)
end
return ra
end
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