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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
local slotcommand = predefined.slot
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 = { slotcommand[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 = { slotcommand[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
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