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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 setmetatableindex = table.setmetatableindex
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 setglue = nuts.setglue
local getwhd = nuts.getwhd
local setwhd = nuts.setwhd
local getlist = nuts.getlist
local setlist = nuts.setlist
local setattrlist = nuts.setattrlist
local setprop = nuts.setprop
local getfont = nuts.getfont
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 flushnode = nuts.flush
local hpack = nuts.hpack
local repack = nuts.repack
local insertbefore = nuts.insertbefore
local insertafter = nuts.insertafter
local effectiveglue = nuts.effectiveglue
local newkern = nuts.pool.kern
local newrule = nuts.pool.rule
local newglue = nuts.pool.glue
local traversers = nuts.traversers
local nextrecord = traversers.alignrecord
local nextunset = traversers.unset
local nextglyph = traversers.glyph
local nextglue = traversers.glue
local nextboundary = traversers.boundary
local nextnode = traversers.node
local nextlist = traversers.list
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local glue_code = nodecodes.glue
local kern_code = nodecodes.kern
local disc_code = nodecodes.disc
local unset_code = nodecodes.unset
local alignrecord_code = nodecodes.alignrecord
local spaceskip_code = nodes.gluecodes.spaceskip
local xspaceskip_code = nodes.gluecodes.xspaceskip
local intermathskip_code = nodes.gluecodes.intermathskip
local fontkern_code = nodes.kerncodes.fontkern
local row_code = nodes.listcodes.alignment -- should be row
local cell_code = nodes.listcodes.cell
local line_code = nodes.listcodes.line
-- local preamble_pass <const> = tex.alignmentcontextcodes.preamble
-- local preroll_pass <const> = tex.alignmentcontextcodes.preroll
-- local wrapup_pass <const> = tex.alignmentcontextcodes.wrapup
-- todo statistics and tracing
local method = 2
local unislots = fonts.hashes.unislots -- todo
local chardata = fonts.hashes.characters
function nodes.handlers.aligncharacter(head,where,attr,preamble)
if where == "preroll" then
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
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,
}
-- Let's put it here (for now):
do
local getdata = nuts.getdata
local removenode = nuts.remove
local getwhd = nuts.getwhd
local getheight = nuts.getheight
local getdepth = nuts.getdepth
local setheight = nuts.setheight
local setdepth = nuts.setdepth
local getglue = nuts.getglue
local setoffsets = nuts.setoffsets
local setsubtype = nuts.setsubtype
local baselineskip_code = nodes.gluecodes.baselineskip
local lineskip_code = nodes.gluecodes.lineskip
local alignrecord_code = nodecodes.alignrecord
local hlist_code = nodecodes.hlist
local unset_code = nodecodes.unset
local nextnode = nuts.traversers.node
local texgetdimen = tex.getdimen
local texgetglue = tex.getglue
local texget = tex.get
local leftmarker = tex.boundaries.system("c_math_align_l_marker")
local rightmarker = tex.boundaries.system("c_math_align_r_marker")
local a_location = attributes.system("mathnumberlocation")
local a_threshold = attributes.system("mathnumberthreshold")
-- Here:
local function openup(specification,head)
local inbetween = specification.inbetween or 0
local height = specification.height or 0
local depth = specification.depth or 0
local lines = { }
for n, id, subtype, list in nextlist, head do
lines[#lines+1] = { n, subtype, getwhd(n) }
end
local t = #lines
if t > 0 then
local l = 1
for n, subtype in nextglue, head do
-- one day we can decide what to do with intertext stuff based on the
-- subtype but not now ... on our agenda (intertext etc)
if subtype == baselineskip_code or subtype == lineskip_code then
local amount, stretch, shrink = getglue(n)
local prevdp = lines[l] [5]
local nextht = lines[l+1][4]
local delta = 0
if prevdp < depth then
setdepth(lines[l][1],depth)
delta = delta + (depth - prevdp)
end
if nextht < height then
setheight(lines[l+1][1],height)
delta = delta + (height - nextht)
end
if subtype == lineskip_code then
setglue(n,inbetween,stretch,shrink)
setsubtype(n,baselineskip_code)
else
setglue(n,amount+inbetween-delta,stretch,shrink)
end
l = l + 1
-- if l > t then
-- break
-- end
end
end
local firstht = lines[1][4]
local lastdp = lines[t][5]
if firstht < height then
setheight(lines[1],height)
end
if lastdp < depth then
setdepth(lines[t],depth)
end
end
end
nuts.openup = openup
-- When present, the number is after the right marker. We need to move the
-- number when we want it at the left.
--
-- Todo: set a flag in mathalignment and support atttibutes on it so that
-- we can check if this is needed.
-- [dummy] [left -2] [second -1] [number 0]
-- In the end it makes more sense to just calculate the alignment in lua
-- but it is kind of fun to see how we can control alignments.
local totals = { }
local widths = { }
local records = { }
local deltas = { }
local cellwidths = { }
local a_flushleft <const> = 1
local a_centered <const> = 2
local a_flushright <const> = 3
local function first_pass(head,attr,preamble)
--
local width = 0
local hsize = texget("hsize")
local count = 0
local overflow = false
totals = { } -- maybe use one table
widths = { }
records = { }
deltas = { }
for n in nextrecord, preamble do
local wd = getwidth(n)
count = count + 1
width = width + wd
totals [count] = width
widths [count] = wd
records[count] = n
deltas [count] = 0
end
--
local lindex = 0
local rindex = 0
local lwidth = 0
local rwidth = 0
local centered = false
for row in nextunset, head do
local count = 0
local anchor = nil
local rochan = nil
-- local cellwidths = { }
for cell in nextunset, getlist(row) do
local list = getlist(cell)
count = count + 1
cellwidths[count] = getwidth(cell)
for bound in nextboundary, list do
local marker = getdata(bound)
if marker == leftmarker then
lindex = count
anchor = bound
rochan = list
elseif marker == rightmarker then
local n = getnext(bound)
if n and getid(n) == hlist_code then
local wd, ht, dp = getwhd(n)
local lc = getattr(n,a_location)
if lc then
-- todo: just store align in the outer attribute so once ...
local align = lc // 0x10
local location = lc % 0x10
local threshold = getattr(n,a_threshold)
if location == 1 then
-- number right
local m = 1
local s = align == a_centered and 2 or 1
-- if align == 1 then
if align == a_flushleft then
-- flushleft
rwidth = wd
-- elseif align == 3 then
elseif align == a_flushright then
-- flushright
rwidth = wd
elseif wd > lwidth then
lwidth = wd
rwidth = wd
centered = true
end
if totals[count-2] + cellwidths[count-1] + s*wd - s*threshold > hsize then
local total = ht + dp
setdepth(row,getdepth(row) + total)
setoffsets(n,0,-total)
local pr = records[count-1]
local cw = getwidth(pr)
if cw - wd > deltas[count-1] then
deltas[count-1] = cw - wd
end
overflow = true
end
elseif location == 2 then
-- number left
-- if align == 1 then
if align == a_flushleft then
-- flushleft
lwidth = wd
-- elseif align == 3 then
elseif align == a_flushright then
-- flushright
lwidth = wd
end
end
if location == 2 and anchor then
local l, l, n = removenode(list,n)
if l ~= list then
setlist(cell,l)
-- setwidth(cell,0)
end
insertafter(rochan,anchor,n)
end
end
end
rindex = count
end
end
end
end
--
if overflow then
if deltas[rindex-1] ~= 0 then
setwidth(records[rindex-1],deltas[rindex-1])
end
end
for count=1,#records do
if count == lindex then
if centered and overflow then
lwidth = lwidth - tex.getdimen("d_math_eqalign_number_distance")
end
setwidth(records[count],lwidth)
elseif count == rindex then
setwidth(records[count],rwidth)
end
end
end
local function second_pass(head,attr,preamble)
local done = setmetatableindex("table")
local glues = { }
local okay = false
for row, id, subtype in nextlist, head do
if id == hlist_code and subtype == row_code then
for cell, id, subtype in nextlist, getlist(row) do
if id == hlist_code and subtype == cell_code then
for n, s in nextglue, getlist(cell) do
if s == intermathskip_code then
local e = effectiveglue(n,cell)
local g = getglue(n)
local f = getfont(n)
local a = done[f]
local d = a[g]
glues[n] = g
if not d then
a[g] = e
elseif d > e then
a[g] = e
okay = true
end
end
end
end
end
end
end
if okay then
for k, v in next, glues do
local g = done[getfont(k)][v]
if g then
setglue(k,g)
setprop(k,"fixedmathalign",true)
end
end
for row, id, subtype in nextlist, head do
if id == hlist_code and subtype == row_code then
for cell, id, subtype, list in nextlist, getlist(row) do
if list and id == hlist_code and subtype == cell_code then
local wd = getwidth(cell)
repack(cell,wd,"exactly")
end
end
end
end
end
end
local function third_pass(head,attr,preamble)
local inbetween, stretch, shrink = texgetglue("s_strc_math_alignment_inbetween")
openup({ inbetween = inbetween }, head)
end
-- maybe zero pass: preamble pass
function nodes.handlers.fixmathalign(head,where,attr,preamble)
if where == "preroll" then
local signal = getattr(attr,a_location)
if signal == 0x20 or signal == 0x40 then
first_pass(head,attr,preamble)
end
elseif where == "wrapup" then
local signal = getattr(attr,a_location)
if signal == 0x40 then
second_pass(head,attr,preamble)
end
-- maybe also signal
third_pass(head,attr,preamble)
end
end
end
local report = logs.reporter("alignment","preamble")
local trace trackers.register("alignments.showstates",function(v) trace = v end)
function nodes.handlers.showpreamble(head,where,attr,preamble)
if trace then
local c = 0
for n, id in nextnode, preamble do
if id == unset_code or id == alignrecord_code then
c = c + 1
report("stage %a, cell %i, width %p",where,c,getwidth(n))
elseif id == glue_code then
report("stage %a, tabskip %s",where,node.direct.gluetostring(n))
else
report("stage %a, node %a",where,nodecodes[id])
end
end
end
end
|