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if not modules then modules = { } end modules ['font-imp-braille'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA ADE",
copyright = "ConTeXt Development Team",
license = "see context related readme files"
}
if not context then return end
-- require("char-brl.lmt") -- we delay this one
-- we can omit spaces and tweak the math parameters instead
-- callback.register("math_rule", function(kind,font,width,height,attr)
-- return nodes.tonode(nodes.nuts.pool.rule(width,5*height,5*height))
-- end)
local braille = characters.braille -- so this one is nil
local braille_math_rule do
local nuts = nodes.nuts
local tonut = nodes.tonut
local tonode = nodes.tonode
local nodepool = nuts.pool
local setattrlist = nuts.setattrlist
local hpack = nuts.hpack
-- local getwhd = nuts.getwhd
-- local setwhd = nuts.setwhd
-- local setoffsets = nuts.setoffsets
local newmathglyph = nuts.newmathglyph
local newleader = nodepool.leader
local braillerule
braille_math_rule = function(kind,font,width,height,attr)
if not braillerule then
braillerule = braille.special("rule")
end
local attlst = tonut(attr)
local glyph = newmathglyph(font,braillerule,attlst)
local box = hpack(glyph)
--
-- local w, h, d = getwhd(box)
-- local t = (h + d) / 2
-- setwhd(box,w,t,t)
-- setoffsets(glyph,0,-t) -- setting the offset of the box messes up (visual) things
--
local leader = newleader(width,box)
local result = hpack(leader,width,"exactly")
setattrlist(leader,attlst)
return tonode(result)
end
end
local setmetatableindex = table.setmetatableindex
local cache = table.setmetatableindex(function(t,w)
local v = table.setmetatableindex(function(t,u)
local v = { "offset", w, 0, u }
t[u] = v
return v
end)
t[w] = v
return v
end)
local function initialize(tfmdata,value)
if value then
if not braille then
require("char-brl.lmt")
braille = characters.braille
end
callback.register("math_rule", braille_math_rule)
local characters = tfmdata.characters
local numberdata = characters[braille.special("number")]
if numberdata then
local ismath = value ~= "text" and (value == "math" or tfmdata.mathparameters)
local list = ismath and braille.mathlist() or braille.textlist()
local unicode = ismath and braille.mathunicode or braille.textunicode
local width = numberdata.width
local height = numberdata.height
local depth = numberdata.depth
for i=1,#list do
local u = list[i]
local t = unicode(u)
local d = characters[u]
local w = 0
local c = { }
local n = #t
for i=1,n do
local ub = t[i]
local db = characters[ub]
if db then
c[i] = cache[w][ub]
w = w + width
end
end
if d then
d.width = n * width
d.height = height
d.depth = depth
d.commands = c
d.smaller = nil
else
characters[u] = {
width = n * width,
height = height,
depth = depth,
commands = c,
unicode = u,
}
end
end
characters[0xAD] = characters[45]
end
end
end
local specification = {
name = "braille",
description = "braille",
manipulators = {
base = initialize,
node = initialize,
}
}
fonts.handlers.otf.features.register(specification)
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