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1if not modules then modules = { } end modules ['font-imp-digits'] = {
2    version   = 1.001,
3    comment   = "companion to font-ini.mkiv",
4    author    = "Hans Hagen, PRAGMA ADE",
5    copyright = "ConTeXt Development Team",
6    license   = "see context related readme files"
7}
8
9if not context then return end
10
11local equaldigits = { }
12
13-- for i=48,57 do
14--     equaldigits[i] = fonts.helpers.newprivateslot(tonumber(i)..".equaldigits")
15-- end
16
17local function initialize(tfmdata,key,value)
18    if key and value then
19        local characters = tfmdata.characters
20        local wd, ht, dp = 0, 0, 0
21        for i=48,57 do
22            if not equaldigits[i] then
23                equaldigits[i] = fonts.helpers.newprivateslot(tonumber(i)..".equaldigits")
24            end
25            local c = characters[i]
26            local w = c.width  or 0
27            local h = c.height or 0
28            local d = c.depth  or 0
29            if w > wd then wd = w end
30            if h > ht then ht = h end
31            if d > dp then dp = d end
32        end
33        for i=48,57 do
34         -- fonts.helpers.addprivate(tfmdata,tonumber(i)..".equaldigits")
35            local u = equaldigits[i]
36            local c = characters[i]
37            characters[u] = table.setmetatableindex( {
38               height  = ht,
39               depth   = dp,
40               width   = wd,
41               xoffset = (wd - (c.width  or 0)) / 2,
42           }, c)
43        end
44    end
45end
46
47fonts.handlers.otf.features.register {
48    name        = "equaldigits",
49    description = "equaldigits",
50    manipulators = {
51        base = initialize,
52        node = initialize,
53    }
54}
55
56fonts.handlers.otf.addfeature {
57 -- name    = "tnum", -- let's not waste that one
58    name    = "tabledigits",
59    type    = "substitution",
60    nocheck = true,
61    data    = equaldigits,
62}
63