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if not modules then modules = { } end modules ['font-oti'] = {
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 lower = string.lower
local fonts = fonts
local constructors = fonts.constructors
local otf = constructors.handlers.otf
local otffeatures = constructors.features.otf
local registerotffeature = otffeatures.register
local otftables = otf.tables or { }
otf.tables = otftables
local allocate = utilities.storage.allocate
registerotffeature {
name = "features",
description = "initialization of feature handler",
default = true,
}
-- these are later hooked into node and base initializaters
local function setmode(tfmdata,value)
if value then
tfmdata.properties.mode = lower(value)
end
end
otf.modeinitializer = setmode
local function setlanguage(tfmdata,value)
if value then
local cleanvalue = lower(value)
local languages = otftables and otftables.languages
local properties = tfmdata.properties
if not languages then
properties.language = cleanvalue
elseif languages[value] then
properties.language = cleanvalue
else
properties.language = "dflt"
end
end
end
local function setscript(tfmdata,value)
if value then
local cleanvalue = lower(value)
local scripts = otftables and otftables.scripts
local properties = tfmdata.properties
if not scripts then
properties.script = cleanvalue
elseif scripts[value] then
properties.script = cleanvalue
else
properties.script = "dflt"
end
end
end
registerotffeature {
name = "mode",
description = "mode",
initializers = {
base = setmode,
node = setmode,
plug = setmode,
}
}
registerotffeature {
name = "language",
description = "language",
initializers = {
base = setlanguage,
node = setlanguage,
plug = setlanguage,
}
}
registerotffeature {
name = "script",
description = "script",
initializers = {
base = setscript,
node = setscript,
plug = setscript,
}
}
-- here (as also in generic
otftables.featuretypes = allocate {
gpos_single = "position",
gpos_pair = "position",
gpos_cursive = "position",
gpos_mark2base = "position",
gpos_mark2ligature = "position",
gpos_mark2mark = "position",
gpos_context = "position",
gpos_contextchain = "position",
gsub_single = "substitution",
gsub_multiple = "substitution",
gsub_alternate = "substitution",
gsub_ligature = "substitution",
gsub_context = "substitution",
gsub_contextchain = "substitution",
gsub_reversecontextchain = "substitution",
gsub_reversesub = "substitution",
}
function otffeatures.checkeddefaultscript(featuretype,autoscript,scripts)
if featuretype == "position" then
local default = scripts.dflt
if default then
if autoscript == "position" or autoscript == true then
return default
else
report_otf("script feature %s not applied, enable default positioning")
end
else
-- no positioning at all
end
elseif featuretype == "substitution" then
local default = scripts.dflt
if default then
if autoscript == "substitution" or autoscript == true then
return default
end
end
end
end
function otffeatures.checkeddefaultlanguage(featuretype,autolanguage,languages)
if featuretype == "position" then
local default = languages.dflt
if default then
if autolanguage == "position" or autolanguage == true then
return default
else
report_otf("language feature %s not applied, enable default positioning")
end
else
-- no positioning at all
end
elseif featuretype == "substitution" then
local default = languages.dflt
if default then
if autolanguage == "substitution" or autolanguage == true then
return default
end
end
end
end
-- the following might become available generic in due time but for now
-- this is some context playground (development code)
-- if not context then
-- return
-- end
-- local helpers = otf.readers.helpers
-- local axistofactors = helpers.axistofactors
-- local normalizedaxis = helpers.normalizedaxis
-- local getaxisscale = helpers.getaxisscale
-- local cleanname = containers.cleanname
-- local function validvariable(tfmdata)
-- if tfmdata.properties.factors then
-- return
-- end
-- local resources = tfmdata.resources
-- local variabledata = resources and resources.variabledata
-- if not variabledata then
-- return
-- end
-- local instances = variabledata.instances
-- local axis = variabledata.axis
-- local segments = variabledata.segments
-- if instances and axis then
-- return instances, axis, segments
-- end
-- end
-- local function initializeinstance(tfmdata,value)
-- if type(value) == "string" then
-- local instances, axis, segments = validvariable(tfmdata)
-- if instances then
-- local values
-- for i=1,#instances do
-- local instance = instances[i]
-- if cleanname(instance.subfamily) == value then
-- values = instance.values
-- break
-- end
-- end
-- if values then
-- local factors = { }
-- for i=1,#axis do
-- local a = axis[i]
-- factors[i] = getaxisscale(segments,a.minimum,a.default,a.maximum,values[i].value)
-- end
-- tfmdata.properties.instance = {
-- hash = instance,
-- factors = factors,
-- }
-- end
-- else
-- report("incomplete variable data")
-- end
-- end
-- end
-- local function initializeaxis(tfmdata,value)
-- if type(value) == "string" then
-- local instances, axis, segments = validvariable(tfmdata)
-- if instances then
-- local values = axistofactors(value)
-- if values then
-- local factors = { }
-- for i=1,#axis do
-- local a = axis[i]
-- local d = a.default
-- factors[i] = getaxisscale(segments,a.minimum,d,a.maximum,values[a.name or a.tag] or d)
-- end
-- tfmdata.properties.instance = {
-- hash = cleanname(value),
-- factors = factors,
-- }
-- end
-- else
-- report("incomplete variable data")
-- end
-- end
-- end
-- registerotffeature {
-- name = "instance",
-- description = "variation instance",
-- initializers = {
-- node = initializeinstance,
-- base = initializeinstance,
-- }
-- }
-- registerotffeature {
-- name = "axis",
-- description = "variation axis",
-- initializers = {
-- node = initializeaxis,
-- base = initializeaxis,
-- }
-- }
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