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if not modules then modules = { } end modules ['math-ext'] = {
version = 1.001,
comment = "companion to math-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local basename = file.basename
local sortedhash = table.sortedhash
local mathematics = mathematics
local extras = mathematics.extras or { }
mathematics.extras = extras
local characters = characters
local chardata = characters.data
local mathpairs = characters.mathpairs
local trace_virtual = false
local report_math = logs.reporter("mathematics")
trackers.register("math.virtual", function(v) trace_virtual = v end)
local mathplus = { }
-- todo: store them and skip storage if already stored
-- todo: make a char-ctx.lua (or is this already side effect of save in format)
local function addextra(unicode)
local min = mathematics.extrabase
local max = min + 0xFFF
if unicode >= min and unicode <= max then
if chardata[unicode] then
mathplus[unicode] = true
else
report_math("extra %U is not a registered code point",unicode)
end
else
report_math("extra %U should be in range %U - %U",unicode,min,max)
end
end
extras.add = addextra
function extras.copy(target,original)
local characters = target.characters
local properties = target.properties
local parameters = target.parameters
for unicode in sortedhash(mathplus) do
local extradesc = chardata[unicode]
local nextinsize = extradesc.nextinsize
if nextinsize then
local extrachar = characters[unicode]
local first = 1
local charused = unicode
if not extrachar then
for i=1,#nextinsize do
local slot = nextinsize[i]
extrachar = characters[slot]
if extrachar then
characters[unicode] = extrachar
first = i + 1
charused = slot
break
end
end
end
if not extrachar then
if trace_virtual then
report_math("extra %U in %a at %p with class %a and name %a is not mapped",
unicode,basename(properties.fullname),parameters.size,
extradesc.mathclass,extradesc.mathname)
end
elseif not extrachar.next then
local nextused = false
for i=first,#nextinsize do
local nextslot = nextinsize[i]
local nextbase = characters[nextslot]
if nextbase then
local nextnext = nextbase and nextbase.next
if nextnext then
local nextchar = characters[nextnext]
if nextchar then
extrachar.next = nextchar
nextused = nextslot
break
end
end
end
end
if trace_virtual then
if nextused then
report_math("extra %U in %a at %p with class %a and name %a maps onto %U with next %U",
unicode,basename(properties.fullname),parameters.size,charused,
extradesc.mathclass,extradesc.mathname,nextused)
else
report_math("extra %U in %a at %p with class %a and name %a maps onto %U with no next",
unicode,basename(properties.fullname),parameters.size,charused,
extradesc.mathclass,extradesc.mathname)
end
end
else
if trace_virtual then
report_math("extra %U in %a at %p with class %a and name %a maps onto %U with no next", -- own next
unicode,basename(properties.fullname),parameters.size,charused,
extradesc.mathclass,extradesc.mathname)
end
end
end
end
end
utilities.sequencers.appendaction(mathactions,"system","mathematics.extras.copy")
extras.add(0xFE321)
extras.add(0xFE322)
extras.add(0xFE323)
extras.add(0xFE324)
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