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if not modules then modules = { } end modules ['font-vf'] = {
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"
}
--[[ldx--
<p>This is very experimental code! Not yet adapted to recent changes. This will change.</p>
--ldx]]--
-- present in the backend but unspecified:
--
-- vf.rule vf.special vf.right vf.push vf.down vf.char vf.node vf.fontid vf.pop vf.image vf.nop
local next = next
local allocate = utilities.storage.allocate
local setmetatableindex = table.setmetatableindex
local fastcopy = table.fastcopy
local fonts = fonts
local constructors = fonts.constructors
local vf = constructors.newhandler("vf")
-- general code
function vf.find(name)
name = file.removesuffix(file.basename(name))
if constructors.resolvevirtualtoo then
local format = fonts.loggers.format(name)
if format == 'tfm' or format == 'ofm' then
if trace_defining then
report_defining("locating vf for %a",name)
end
return findbinfile(name,"ovf")
else
if trace_defining then
report_defining("vf for %a is already taken care of",name)
end
return nil -- ""
end
else
if trace_defining then
report_defining("locating vf for %a",name)
end
return findbinfile(name,"ovf")
end
end
--[[ldx--
<p>We overload the <l n='vf'/> reader.</p>
--ldx]]--
callbacks.register('find_vf_file', vf.find, "locating virtual fonts, insofar needed") -- not that relevant any more
-- specific code (will move to other module)
local definers = fonts.definers
local methods = definers.methods
local variants = allocate()
local combinations = { }
local combiner = { }
local whatever = allocate()
local helpers = allocate()
local predefined = allocate {
dummy = { "comment" },
push = { "push" },
pop = { "pop" },
}
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, gc = f.characters, g.characters
local fd, gd = f.descriptions, 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, gc = f.characters, g.characters
local fd, gd = f.descriptions, 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, value = v[2], 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.load = combine_load
--~ combiner.assign = combine_assign
--~ combiner.process = combine_process
--~ combiner.names = combine_names
--~ combiner.feature = combine_feature
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 = {
virtualized = true,
},
fonts = {
},
characters = {
},
descriptions = {
},
specification = fastcopy(specification),
}
combine_process(g,combinations[tag])
return g
end
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