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if not modules then modules = { } end modules ['node-ali'] = {
version = 1.001,
comment = "companion to node-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local a_alignchar = attributes.private("aligncharacter")
local nuts = nodes.nuts
local tonut = nuts.tonut
local tonode = nuts.tonode
local getwidth = nuts.getwidth
local setwidth = nuts.setwidth
local getid = nuts.getid
local getattr = nuts.getattr
local setnext = nuts.setnext
local getnext = nuts.getnext
local getprev = nuts.getprev
local setglue = nuts.setglue
local getglue = nuts.getglue
local getlist = nuts.getlist
local setlist = nuts.setlist
local setattrlist = nuts.setattrlist
local getchar = nuts.getchar
local addmargins = nuts.addmargins
local findtail = nuts.tail
local hasglyph = nuts.hasglyph
local getwordrange = nuts.getwordrange
local dimensions = nuts.rangedimensions
local nextrecord = nuts.traversers.alignrecord
local nextunset = nuts.traversers.unset
local nextglyph = nuts.traversers.glyph
local nextglue = nuts.traversers.glue
local nextnode = nuts.traversers.node
local prevnode = nuts.treversers.node
local flushnode = nuts.flush
local hpack = nuts.hpack
local glyph_code = nodes.nodecodes.glyph
local glue_code = nodes.nodecodes.glue
local kern_code = nodes.nodecodes.kern
local disc_code = nodes.nodecodes.disc
local spaceskip_code = nodes.gluecodes.spaceskip
local xspaceskip_code = nodes.gluecodes.xspaceskip
local fontkern_code = nodes.kerncodes.fontkern
local newkern = nuts.pool.kern
local insertbefore = nuts.insertbefore
local insertafter = nuts.insertafter
-- todo statistics and tracing
local method = 2
local unislots = fonts.hashes.unislots -- todo
local chardata = fonts.hashes.characters
function nodes.handlers.aligncharacter(head,attr,preamble)
local attr = getattr(attr,a_alignchar) -- 1 : value doesn't matter (for now)
if attr then
local widths = { }
local data = { }
local rows = 0
local cols = 0
for col in nextrecord, preamble do
cols = cols + 1
local w, s = getwidth(col,true)
widths[cols] = { col, w, s }
end
--
for row in nextunset, head do
rows = rows + 1
local c = 0
local d = { }
data[rows] = d
for col in nextunset, getlist(row) do
c = c + 1
if widths[c][2] then
local list = getlist(col)
-- if method == 1 then
-- local left = nil
-- local right = nil
-- local middle = nil
-- for g, char in nextglyph, list do
-- if not left then
-- left = g
-- end
-- if char == getattr(g,a_alignchar) then
-- middle = g
-- end
-- right = g
-- end
-- d[c] = middle and { col, left, middle, right, 0, 0, getwidth(middle) } or false
-- elseif method == 2 then
local middle = nil
-- we can either cache unislots or we can cache for this font
for g, char, font in nextglyph, list do
local unicode = getattr(g,a_alignchar)
if unicode then
if char == unicode then
middle = g
elseif unislots[font][char] == unicode then
middle = g
end
end
end
if middle then
local left, right = getwordrange(middle) -- not real gain but handy anyway (less code too)
-- local left = middle
-- local right = middle
-- for g, id, subtype in nextnode, middle do
-- if id == glyph_code or id == disc_code then
-- right = g
-- elseif id == kern_code and subtype == fontkern_code then
-- right = g
-- else
-- break
-- end
-- end
-- for g, id, subtype in prevnode, middle do
-- if id == glyph_code or id == disc_code then
-- left = g
-- elseif id == kern_code and subtype == fontkern_code then
-- left = g
-- else
-- break
-- end
-- end
d[c] = { col, left, middle, right, 0, 0, getwidth(middle) }
else
d[c] = false
end
-- else
-- local middle = nil
-- for g, char in nextglyph, list do
-- if char == getattr(g,a_alignchar) then
-- middle = g
-- end
-- end
-- if middle then
-- local left = list
-- local right = findtail(list)
-- if getid(left) == glue_code then
-- left = getnext(left)
-- end
-- if getid(right) == glue_code then
-- right = getprev(right)
-- end
-- d[c] = { col, left, middle, right, 0, 0, getwidth(middle) }
-- else
-- d[c] = false
-- end
-- end
else
d[c] = false
end
end
end
--
for col=1,cols do
local maxl = 0
local maxr = 0
local minm = 0
local maxm = 0
local colw = widths[col]
for row=1,rows do
local d = data[row][col]
if d then
local p = d[1]
local l = d[2]
local m = d[3]
local r = d[4]
if m then
local lw = l == m and 0 or dimensions(p,l,m)
local rw = m == r and 0 or dimensions(p,getnext(m),getnext(r))
d[5] = lw
d[6] = rw
if lw > maxl then
maxl = lw
end
if rw > maxr then
maxr = rw
end
local mw = d[7]
if maxm == 0 then
minm = mw
maxm = mw
else
if mw > maxm then
maxm = mw
end
if mw < minm then
minm = mw
end
end
end
end
end
--
local fixedwidth = colw[3] ~= 0
--
local old = colw[2]
local new = old
for row=1,rows do
local d = data[row][col]
if d then
local p = d[1]
local l = d[2]
local m = d[3]
local r = d[4]
if l and m and r then
local lw = d[5]
local rw = d[6]
local mw = d[7]
dl = maxl - lw
dr = maxr - rw
if dl ~= 0 or dr ~= 0 or mw ~= maxm then
local lst = getlist(p)
local wid = getwidth(p)
if dl ~= 0 then
local k = newkern(dl)
lst = insertbefore(lst,l,k)
setattrlist(k,m)
setlist(p,lst)
wid = wid + dl
end
if dr ~= 0 then
local k = newkern(dr)
insertafter(lst,r,k)
setattrlist(k,m)
wid = wid + dr
end
if mw ~= maxm then
local dw = (maxm - mw)
local dx = dw / 2
addmargins(m,-dx,-dx)
wid = wid + dw
end
setwidth(p,wid)
if wid > new then
new = wid
end
setlist(p,lst)
-- somewhat fuzzy:
if fixedwidth then
local l = hpack(h,getwidth(p),"exactly")
setglue(p,getglue(l))
setlist(l)
flushnode(l)
else
setglue(p)
end
--
end
end
end
end
if new > old then
if fixedwidth then
-- issue overflow warning
else
setwidth(colw[1],new)
end
end
end
end
end
local enabled = false
interfaces.implement {
name = "enablealignmentcharacter",
-- onlyonce = true,
public = true,
protected = true,
actions = function()
if not enabled then
nodes.tasks.enableaction("alignments", "nodes.handlers.aligncharacter")
enabled = true
end
end,
}
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