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if not modules then modules = { } end modules ['typo-dig'] = {
version = 1.001,
comment = "companion to typo-dig.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- we might consider doing this after the otf pass because now osf do not work
-- out well in node mode.
local next, type, tonumber = next, type, tonumber
local format, insert = string.format, table.insert
local round, div = math.round, math.div
local trace_digits = false trackers.register("typesetters.digits", function(v) trace_digits = v end)
local report_digits = logs.reporter("typesetting","digits")
local nodes, node = nodes, node
local nuts = nodes.nuts
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getwidth = nuts.getwidth
local isglyph = nuts.isglyph
local takeattr = nuts.takeattr
local setlink = nuts.setlink
local setnext = nuts.setnext
local setprev = nuts.setprev
local hpack_node = nuts.hpack
local traverse_id = nuts.traverse_id
local insert_node_before = nuts.insert_before
local insert_node_after = nuts.insert_after
local texsetattribute = tex.setattribute
local unsetvalue = attributes.unsetvalue
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local nodepool = nuts.pool
local enableaction = nodes.tasks.enableaction
local new_glue = nodepool.glue
local fonthashes = fonts.hashes
local chardata = fonthashes.characters
local v_reset = interfaces.variables.reset
local charbase = characters.data
local getdigitwidth = fonts.helpers.getdigitwidth
typesetters = typesetters or { }
local typesetters = typesetters
typesetters.digits = typesetters.digits or { }
local digits = typesetters.digits
digits.actions = { }
local actions = digits.actions
local a_digits = attributes.private("digits")
-- at some point we can manipulate the glyph node so then i need
-- to rewrite this then
function nodes.aligned(head,start,stop,width,how)
if how == "flushright" or how == "middle" then
head, start = insert_node_before(head,start,new_glue(0,65536,65536))
end
if how == "flushleft" or how == "middle" then
head, stop = insert_node_after(head,stop,new_glue(0,65536,65536))
end
local prv = getprev(start)
local nxt = getnext(stop)
setprev(start)
setnext(stop)
local packed = hpack_node(start,width,"exactly") -- no directional mess here, just lr
if prv then
setlink(prv,packed)
end
if nxt then
setlink(packed,nxt)
end
if getprev(packed) then
return head, packed
else
return packed, packed
end
end
actions[1] = function(head,start,attr)
local char, font = isglyph(start)
local unic = chardata[font][char].unicode or char
if charbase[unic].category == "nd" then -- ignore unic tables
local oldwidth = getwidth(start)
local newwidth = getdigitwidth(font)
if newwidth ~= oldwidth then
if trace_digits then
report_digits("digit trigger %a, instance %a, char %C, unicode %U, delta %s",
attr%100,div(attr,100),char,unic,newwidth-oldwidth)
end
head, start = nodes.aligned(head,start,start,newwidth,"middle")
return head, start
end
end
return head, start
end
function digits.handler(head)
local current = head
while current do
if getid(current) == glyph_code then
local attr = takeattr(current,a_digits)
if attr and attr > 0 then
local action = actions[attr%100] -- map back to low number
if action then
head, current = action(head,current,attr)
elseif trace_digits then
report_digits("unknown digit trigger %a",attr)
end
end
end
if current then
current = getnext(current)
end
end
return head
end
local m, enabled = 0, false -- a trick to make neighbouring ranges work
function digits.set(n) -- number or 'reset'
if n == v_reset then
n = unsetvalue
else
n = tonumber(n)
if n then
if not enabled then
enableaction("processors","typesetters.digits.handler")
if trace_digits then
report_digits("enabling digit handler")
end
enabled = true
end
if m == 100 then
m = 1
else
m = m + 1
end
n = m * 100 + n
else
n = unsetvalue
end
end
texsetattribute(a_digits,n)
end
-- interface
interfaces.implement {
name = "setdigitsmanipulation",
actions = digits.set,
arguments = "string"
}
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