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diff --git a/Master/texmf-dist/tex/context/base/mkxl/font-vir.lmt b/Master/texmf-dist/tex/context/base/mkxl/font-vir.lmt
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+if not modules then modules = { } end modules ['font-vir'] = {
+ 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"
+}
+
+-- This is actually very experimental code but it has been so since we began with
+-- \LUATEX\ so \unknown. We keep it around because it's not that much code and
+-- because we have some demo's (in the test suite) that use it.
+
+local next, setmetatable, getmetatable = next, setmetatable, getmetatable
+
+local allocate = utilities.storage.allocate
+local setmetatableindex = table.setmetatableindex
+local fastcopy = table.fastcopy
+
+local fonts = fonts
+local constructors = fonts.constructors
+local vf = constructors.handlers.vf
+vf.version = 1.000 -- same as tfm
+
+local definers = fonts.definers
+local methods = definers.methods
+
+local variants = allocate()
+local combinations = { }
+local combiner = { }
+local whatever = allocate()
+local helpers = allocate()
+local predefined = fonts.helpers.commands
+
+methods.variants = variants -- todo .. wrong namespace
+vf.combinations = combinations
+vf.combiner = combiner
+vf.whatever = whatever
+vf.helpers = helpers
+vf.predefined = predefined
+
+setmetatableindex(whatever, function(t,k) local v = { } t[k] = v return v end)
+
+local function checkparameters(g,f)
+ if f and g and not g.parameters and #g.fonts > 0 then
+ local p = { }
+ for k,v in next, f.parameters do
+ p[k] = v
+ end
+ g.parameters = p
+ setmetatable(p, getmetatable(f.parameters))
+ end
+end
+
+function methods.install(tag, rules)
+ vf.combinations[tag] = rules
+ variants[tag] = function(specification)
+ return vf.combine(specification,tag)
+ end
+end
+
+local function combine_load(g,name)
+ return constructors.readanddefine(name or g.specification.name,g.specification.size)
+end
+
+local function combine_assign(g, name, from, to, start, force)
+ local f, id = combine_load(g,name)
+ if f and id then
+ -- optimize for whole range, then just g = f
+ if not from then from, to = 0, 0xFF00 end
+ if not to then to = from end
+ if not start then start = from end
+ local fc = f.characters
+ local gc = g.characters
+ local fd = f.descriptions
+ local gd = g.descriptions
+ local hn = #g.fonts+1
+ g.fonts[hn] = { id = id } -- no need to be sparse
+ for i=from,to do
+ if fc[i] and (force or not gc[i]) then
+ gc[i] = fastcopy(fc[i],true) -- can be optimized
+ gc[i].commands = { { "slot", hn, start } }
+ gd[i] = fd[i]
+ end
+ start = start + 1
+ end
+ checkparameters(g,f)
+ end
+end
+
+local function combine_process(g,list)
+ if list then
+ for _,v in next, list do
+ (combiner.commands[v[1]] or nop)(g,v)
+ end
+ end
+end
+
+local function combine_names(g,name,force)
+ local f, id = constructors.readanddefine(name,g.specification.size)
+ if f and id then
+ local fc = f.characters
+ local gc = g.characters
+ local fd = f.descriptions
+ local gd = g.descriptions
+ g.fonts[#g.fonts+1] = { id = id } -- no need to be sparse
+ local hn = #g.fonts
+ for k, v in next, fc do
+ if force or not gc[k] then
+ gc[k] = fastcopy(v,true)
+ gc[k].commands = { { "slot", hn, k } }
+ gd[i] = fd[i]
+ end
+ end
+ checkparameters(g,f)
+ end
+end
+
+local combine_feature = function(g,v)
+ local key = v[2]
+ local value = v[3]
+ if key then
+ if value == nil then
+ value = true
+ end
+ local specification = g.specification
+ if specification then
+ local normalfeatures = specification.features.normal
+ if normalfeatures then
+ normalfeatures[key] = value -- otf?
+ end
+ end
+ end
+end
+
+combiner.commands = allocate {
+ ["initialize"] = function(g,v) combine_assign (g,g.properties.name) end,
+ ["include-method"] = function(g,v) combine_process (g,combinations[v[2]]) end, -- name
+ -- ["copy-parameters"] = function(g,v) combine_parameters(g,v[2]) end, -- name
+ ["copy-range"] = function(g,v) combine_assign (g,v[2],v[3],v[4],v[5],true) end, -- name, from-start, from-end, to-start
+ ["copy-char"] = function(g,v) combine_assign (g,v[2],v[3],v[3],v[4],true) end, -- name, from, to
+ ["fallback-range"] = function(g,v) combine_assign (g,v[2],v[3],v[4],v[5],false) end, -- name, from-start, from-end, to-start
+ ["fallback-char"] = function(g,v) combine_assign (g,v[2],v[3],v[3],v[4],false) end, -- name, from, to
+ ["copy-names"] = function(g,v) combine_names (g,v[2],true) end,
+ ["fallback-names"] = function(g,v) combine_names (g,v[2],false) end,
+ ["feature"] = combine_feature,
+}
+
+function vf.combine(specification,tag)
+ local g = {
+ name = specification.name,
+ properties = { },
+ fonts = { },
+ characters = { },
+ descriptions = { },
+ specification = fastcopy(specification),
+ }
+ combine_process(g,combinations[tag])
+ return g
+end