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if not modules then modules = { } end modules ['font-prv'] = {
version = 1.001,
comment = "companion to font-ini.mkiv and hand-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local type = type
local formatters = string.formatters
local fonts = fonts
local helpers = fonts.helpers
local fontdata = fonts.hashes.identifiers
local setmetatableindex = table.setmetatableindex
local currentprivate = fonts.privateoffsets.textextrabase
local maximumprivate = currentprivate + 0xFFF
local extraprivates = { }
helpers.extraprivates = extraprivates
function fonts.helpers.addextraprivate(name,f)
extraprivates[#extraprivates+1] = { name, f }
end
-- if we run out of space we can think of another range but by sharing we can
-- use these privates for mechanisms like alignments-on-character and such
local sharedprivates = setmetatableindex(function(t,k)
local v = currentprivate
if currentprivate < maximumprivate then
currentprivate = currentprivate + 1
else
-- reuse last slot, todo: warning
end
t[k] = v
return v
end)
function helpers.addprivate(tfmdata,name,characterdata)
local properties = tfmdata.properties
local characters = tfmdata.characters
local privates = properties.privates
if not privates then
privates = { }
properties.privates = privates
end
if not name then
name = formatters["anonymous_private_0x%05X"](currentprivate)
end
local usedprivate = sharedprivates[name]
privates[name] = usedprivate
characters[usedprivate] = characterdata
return usedprivate
end
function helpers.getprivates(tfmdata)
if type(tfmdata) == "number" then
tfmdata = fontdata[tfmdata]
end
local properties = tfmdata.properties
return properties and properties.privates
end
function helpers.hasprivate(tfmdata,name)
if type(tfmdata) == "number" then
tfmdata = fontdata[tfmdata]
end
local properties = tfmdata.properties
local privates = properties and properties.privates
return privates and privates[name] or false
end
function helpers.privateslot(name)
return rawget(sharedprivates,name)
end
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