luametalatex/luametalatex-nodewriter.lua

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local format = string.format
local concat = table.concat
local write = texio.write_nl
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local direct = node.direct
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local properties = direct.properties
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local tonode = direct.tonode
local todirect = direct.todirect
local getid = direct.getid
local traverse = direct.traverse
local getsubtype = direct.getsubtype
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local getdirection = direct.getdirection
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local setsubtype = direct.setsubtype
local getdepth = direct.getdepth
local getheight = direct.getheight
local getwidth = direct.getwidth
local setdepth = direct.setdepth
local setheight = direct.setheight
local setwidth = direct.setwidth
local getshift = direct.getshift
local getlist = direct.getlist
local getkern = direct.getkern
local getreplace = direct.getreplace
local getleader = direct.getleader
local setfont = direct.setfont
local getfont = direct.getfont
local getoffsets = direct.getoffsets
local getnext = direct.getnext
local getexpansion = direct.getexpansion
local getchar = direct.getchar
local rangedimensions = direct.rangedimensions
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local traverse_id = direct.traverse_id
local getdata = direct.getdata
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local dir_id = node.id'dir'
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local function doublekeyed(t, id2name, name2id, index)
return setmetatable(t, {
__index = index,
__newindex = function(t, k, v)
rawset(t, k, v)
if type(k) == 'string' then
rawset(t, name2id(k), v)
else
rawset(t, id2name(k), v)
end
end,
})
end
local nodehandler = (function()
local function unknown_handler(_, n, x, y)
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write(format("Sorry, but the PDF backend does not support %q (id = %i) nodes right now. The supplied node will be dropped at coordinates (%i, %i).", node.type(getid(n)), getid(n), x//1, y//1))
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end
return doublekeyed({}, node.type, node.id, function()
return unknown_handler
end)
end)()
local whatsithandler = (function()
local whatsits = node.whatsits()
local function unknown_handler(p, n, x, y, ...)
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local prop = properties[n]-- or node.getproperty(n)
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if prop and prop.handle then
prop:handle(p, n, x, y, ...)
else
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write(format("Sorry, but the PDF backend does not support %q (id = %i) whatsits right now. The supplied node will be dropped at coordinates (%i, %i).", whatsits[getsubtype(n)], getsubtype(n), x//1, y//1))
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end
end
return doublekeyed({}, function(n)return whatsits[n]end, function(n)return whatsits[n]end, function()
return unknown_handler
end)
end)()
local glyph, text, page, cm_pending = 1, 2, 3, 4
local gsub = string.gsub
local function projected_point(m, x, y, w)
w = w or 1
return x*m[1] + y*m[3] + w*m[5], x*m[2] + y*m[4] + w*m[6]
end
local function sp2bp(sp)
return sp/65781.76
end
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local fontnames = setmetatable({}, {__index = function(t, k) local res = format("F%i", k) t[k] = res return res end})
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local topage
local function totext(p, fid)
local last = p.mode
if last == glyph then
p.pending[#p.pending+1] = ")]TJ"
p.strings[#p.strings+1] = concat(p.pending)
for i=1,#p.pending do p.pending[i] = nil end
last = text
end
if last == cm_pending then topage(p) end
p.mode = text
if last == text and p.font.fid == fid then return end
local f = font.getfont(fid) or font.fonts[fid]
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if last ~= text then p.strings[#p.strings+1] = "BT" p.pos.lx, p.pos.ly, p.pos.x, p.pos.y, p.font.exfactor, p.font.extend, p.font.squeeze, p.font.slant = 0, 0, 0, 0, 0, 1, 1, 0 end
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if not f.parent then f.parent = pdf.getfontname(fid) end
p.resources.Font[fontnames[f.parent]] = p.fontdirs[f.parent]
p.strings[#p.strings+1] = format("/F%i %f Tf 0 Tr", f.parent, sp2bp(f.size)) -- TODO: Setting the mode, width, etc.
p.font.usedglyphs = p.usedglyphs[f.parent]
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p.font.fid = fid
p.font.font = f
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local need_tm = false
if p.font.extend ~= (f.extend or 1000)/1000 then
p.font.extend = (f.extend or 1000)/1000
need_tm = true
end
if p.font.squeeze ~= (f.squeeze or 1000)/1000 then
p.font.squeeze = (f.squeeze or 1000)/1000
need_tm = true
end
if p.font.slant ~= (f.slant or 0)/1000 then
p.font.slant = (f.slant or 0)/1000
need_tm = true
end
return need_tm
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end
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function topage(p)
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local last = p.mode
if last == page then return end
if last <= text then
totext(p, p.font.fid) -- First make sure we are really in text mode
p.strings[#p.strings+1] = "ET"
elseif last == cm_pending then
local pending = p.pending_matrix
if pending[1] ~= 1 or pending[2] ~= 0 or pending[3] ~= 0 or pending[4] ~= 1 or pending[5] ~= 0 or pending[6] ~= 0 then
p.strings[#p.strings+1] = format("%f %f %f %f %f %f cm", pending[1], pending[2], pending[3], pending[4], sp2bp(pending[5]), sp2bp(pending[6]))
end
else
error[[Unknown mode]]
end
p.mode = page
end
local function toglyph(p, fid, x, y, exfactor)
local last = p.mode
if last == glyph and p.font.fid == fid and p.pos.y == y and p.font.exfactor == exfactor then
if x == p.pos.x then return end
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local xoffset = (x - p.pos.x)/p.font.font.size * 1000 / p.font.extend / (1+exfactor/1000000)
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if math.abs(xoffset) < 1000000 then -- 1000000 is arbitrary
p.pending[#p.pending+1] = format(")%i(", math.floor(-xoffset))
p.pos.x = x
return
end
end
if totext(p, fid) or exfactor ~= p.font.exfactor then
p.font.exfactor = exfactor
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p.strings[#p.strings+1] = gsub(format("%f 0.0 %f %f %f %f Tm", p.font.extend * (1+exfactor/1000000), p.font.slant, p.font.squeeze, sp2bp(x), sp2bp(y)), '%.?0+ ', ' ')
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else
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-- To invert the text transformation matrix (extend 0 0;slant squeeze 0;0 0 1)
-- we have to apply (extend^-1 0 0;-slant*extend^-1*squeeze^-1 squeeze^-1 0;0 0 1). (extend has to include expansion)
-- We optimize slightly by separating some steps
local dx, dy = sp2bp((x - p.pos.lx)), sp2bp(y - p.pos.ly) / p.font.squeeze
dx = (dx-p.font.slant*dy) / (p.font.extend * (1+exfactor/1000000))
p.strings[#p.strings+1] = gsub(format("%f %f Td", dx, dy), '%.?0+ ', ' ')
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end
p.pos.lx, p.pos.ly, p.pos.x, p.pos.y = x, y, x, y
p.mode = glyph
p.pending[1] = "[("
end
-- Let's start with "handlers" for nodes which do not need any special handling:
local function ignore_node() end
-- The following are already handled by the list handler because they only correspond to blank space:
nodehandler.math = ignore_node
nodehandler.kern = ignore_node
-- The following are only for frontend use:
nodehandler.boundary = ignore_node
nodehandler.local_par = ignore_node
nodehandler.penalty = ignore_node
nodehandler.mark = ignore_node
-- Now we come to more interesting nodes:
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function nodehandler.hlist(p, list, x0, y, outerlist, origin, level)
if outerlist then
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if getid(outerlist) == 0 then
y = y - getshift(list)
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else
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x0 = x0 + getshift(list)
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end
end
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local direction = getdirection(list)
if direction == 1 then
x0 = x0 + getwidth(list)
end
local dirstack = {}
local dirnodes = {}
for n, sub in traverse_id(dir_id, getlist(list)) do
if sub == 0 then
dirstack[#dirstack + 1] = n
else
local m = dirstack[#dirstack]
dirnodes[m] = n
dirstack[#dirstack] = nil
end
end
for i=1,#dirstack do
dirnodes[dirstack[i]] = rangedimensions(list, dirstack[i])
end
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local x = x0
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local linkcontext = p.linkcontext
if linkcontext then
linkcontext:set(p, x, y, list, level+1, 'start')
end
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for n, id, sub in traverse(getlist(list)) do
if id == dir_id then
if sub == 0 then
local newdir = getdirection(n)
if newdir ~= direction then
local close = dirnodes[n]
local dim = rangedimensions(list, n, close)
if close then dirnodes[close] = dim end
x = x + (2*newdir-1) * dim
direction = newdir
end
else
local dim = dirnodes[n]
if dim then
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x = x + (2*direction-1) * dim
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direction = 1-direction
end
end
else
local next = getnext(n)
local w = next and rangedimensions(list, n, next) or rangedimensions(list, n)
if direction == 1 then x = x - w end
nodehandler[id](p, n, x, y, list, x0, level+1)
if direction == 0 then x = w + x end
end
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end
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linkcontext = p.linkcontext
if linkcontext then
linkcontext:set(p, x, y, list, level+1, 'end')
end
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end
function nodehandler.vlist(p, list, x, y0, outerlist, origin, level)
if outerlist then
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if getid(outerlist) == 0 then
y0 = y0 - getshift(list)
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else
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x = x + getshift(list)
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end
end
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y0 = y0 + getheight(list)
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local y = y0
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for n in traverse(getlist(list)) do
local d, h, _ = 0, direct.effective_glue(n, list) or math.tointeger(getkern(n))
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if not h then
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_, h, d = direct.getwhd(n)
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end
y = y - (h or 0)
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nodehandler[getid(n)](p, n, x, y, list, y0, level+1)
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y = y - (d or 0)
end
end
do
local rulesubtypes = {}
for i, n in next, node.subtypes'rule' do
rulesubtypes[n] = i
end
local box_rule = rulesubtypes.box
local image_rule = rulesubtypes.image
local user_rule = rulesubtypes.user
local empty_rule = rulesubtypes.empty
local outline_rule = rulesubtypes.outline
local ship_img = require'luametalatex-pdf-image'.ship
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local ship_box = require'luametalatex-pdf-savedbox'.ship
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-- print(require'inspect'(node.subtypes('glue')))
-- print(require'inspect'(node.fields('glue')))
-- print(require'inspect'(node.fields('rule')))
-- print(require'inspect'(node.fields('whatsit')))
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function nodehandler.rule(p, n, x, y, outer)
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if getwidth(n) == -1073741824 then setwidth(n, getwidth(outer)) end
if getheight(n) == -1073741824 then setheight(n, getheight(outer)) end
if getdepth(n) == -1073741824 then setdepth(n, getdepth(outer)) end
local sub = getsubtype(n)
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if getwidth(n) <= 0 or getdepth(n) + getheight(n) <= 0 then return end
if sub == box_rule then
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ship_box(getdata(n), p, n, x, y)
elseif sub == image_rule then
ship_img(getdata(n), p, n, x, y)
elseif sub == empty_rule then
elseif sub == user_rule then
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error[[We can't handle user rules yet]]
elseif sub == outline_rule then
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error[[We can't handle outline rules yet]]
else
topage(p)
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p.strings[#p.strings+1] = gsub(format("%f %f %f %f re f", sp2bp(x), sp2bp(y - getdepth(n)), sp2bp(getwidth(n)), sp2bp(getdepth(n) + getheight(n))), '%.?0+ ', ' ')
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end
end
end
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function nodehandler.disc(p, n, x, y, list, ...) -- FIXME: I am not sure why this can happen, let's assume we can use .replace
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for n in traverse(getreplace(n)) do
local next = getnext(n)
local w = next and rangedimensions(list, n, next) or rangedimensions(list, n)
nodehandler[getid(n)](p, n, x, y, list, ...)
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x = w + x
end
end
function nodehandler.glue(p, n, x, y, outer, origin, level) -- Naturally this is an interesting one.
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local subtype = getsubtype(n)
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if subtype < 100 then return end -- We only really care about leaders
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local leader = getleader(n)
local w = direct.effective_glue(n, outer)
if getid(leader) == 2 then -- We got a rule, this should be easy
if getid(outer) == 0 then
setwidth(leader, w)
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else
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setheight(leader, w)
setdepth(leader, 0)
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end
return nodehandler.rule(p, leader, x, y, outer)
end
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local lwidth = getid(outer) == 0 and getwidth(leader) or getheight(leader) + getdepth(leader)
if getid(outer) ~= 0 then
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y = y + w
end
if subtype == 100 then
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if getid(outer) == 0 then
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local newx = ((x-origin - 1)//lwidth + 1) * lwidth + origin
-- local newx = -(origin-x)//lwidth * lwidth + origin
w = w + x - newx
x = newx
else
-- local newy = -(origin-y)//lwidth * lwidth + origin
local newy = (y-origin)//lwidth * lwidth + origin
w = w + newy - y
y = newy
end
elseif subtype == 101 then
local inner = w - (w // lwidth) * lwidth
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if getid(outer) == 0 then
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x = x + inner/2
else
y = y - inner/2
end
elseif subtype == 102 then
local count = w // lwidth
local skip = (w - count * lwidth) / (count + 1)
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if getid(outer) == 0 then
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x = x + skip
else
y = y - skip
end
lwidth = lwidth + skip
elseif subtype == 103 then
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if getid(outer) == 0 then
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local newx = ((x - 1)//lwidth + 1) * lwidth
w = w + x - newx
x = newx
else
local newy = y//lwidth * lwidth
w = w + newy - y
y = newy
end
end
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local handler = nodehandler[getid(leader)]
if getid(outer) == 0 then
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while w >= lwidth do
handler(p, leader, x, y, outer, origin, level+1)
w = w - lwidth
x = x + lwidth
end
else
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y = y - getheight(leader)
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while w >= lwidth do
handler(p, leader, x, y, outer, origin, level+1)
w = w - lwidth
y = y - lwidth
end
end
end
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local pdf_escape = require'luametalatex-pdf-escape'.escape_raw
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local match = lpeg.match
local function do_commands(p, c, f, fid, x, y, outer, ...)
local fonts = f.fonts
local stack, current_font = {}, fonts[1]
for _, cmd in ipairs(c.commands) do
if cmd[1] == "node" then
local cmd = cmd[2]
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nodehandler[getid(cmd)](p, cmd, x, y, nil, ...)
x = x + getwidth(cmd)
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elseif cmd[1] == "font" then
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current_font = assert(fonts[cmd[2]], "invalid font requested")
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elseif cmd[1] == "char" then
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local n = direct.new'glyph'
setsubtype(n, 256)
setfont(n, current_font.id, cmd[2])
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nodehandler.glyph(p, n, x, y, outer, ...)
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x = x + getwidth(n)
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direct.free(n)
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elseif cmd[1] == "slot" then
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local n = direct.new'glyph'
setsubtype(n, 256)
setfont(n, cmd[2], cmd[3])
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nodehandler.glyph(p, n, x, y, outer, ...)
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direct.free(n)
x = x + getwidth(n)
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elseif cmd[1] == "rule" then
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local n = direct.new'rule'
setheight(n, cmd[2])
setwidth(n, cmd[3])
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nodehandler.rule(p, n, x, y, outer, ...)
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direct.free(n)
x = x + getwidth(n)
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elseif cmd[1] == "left" then
x = x + cmd[2]
elseif cmd[1] == "down" then
y = y + cmd[2]
elseif cmd[1] == "push" then
stack[#stack + 1] = {x, y}
elseif cmd[1] == "pop" then
local top = stack[#stack]
stack[#stack] = nil
x, y = top[1], top[2]
elseif cmd[1] == "special" then
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error[[specials aren't supported yet]] -- TODO
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elseif cmd[1] == "pdf" then
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pdf.write(cmd[3] and cmd[2] or "origin", cmd[3], x, y, p)
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elseif cmd[1] == "lua" then
cmd = cmd[2]
if type(cmd) == "string" then cmd = load(cmd) end
assert(type(cmd) == "function")
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pdf._latelua(p, x, y, cmd, fid, c)
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elseif cmd[1] == "image" then
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error[[images aren't supported yet]] -- TODO
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-- ???
-- else
-- NOP, comment and invalid commands ignored
end
end
end
function nodehandler.glyph(p, n, x, y, ...)
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if getfont(n) ~= p.vfont.fid then
p.vfont.fid = getfont(n)
p.vfont.font = font.getfont(getfont(n)) or font.fonts[getfont(n)]
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end
local f, fid = p.vfont.font, p.vfont.fid
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local c = f.characters[getchar(n)]
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if not c then
texio.write_nl("Missing character")
return
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end
if c.commands then return do_commands(p, c, f, fid, x, y, ...) end
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local xoffset, yoffset = getoffsets(n)
toglyph(p, getfont(n), x + xoffset, y + yoffset, getexpansion(n))
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local index = c.index
if index then
-- if f.encodingbytes == -3 then
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if false then
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if index < 0x80 then
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p.pending[#p.pending+1] = pdf_escape(string.pack('>B', index))
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elseif index < 0x7F80 then
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p.pending[#p.pending+1] = pdf_escape(string.pack('>H', index+0x7F80))
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else
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p.pending[#p.pending+1] = pdf_escape(string.pack('>BH', 0xFF, index-0x7F80))
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end
else
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p.pending[#p.pending+1] = pdf_escape(string.pack('>H', index))
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end
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if not p.font.usedglyphs[index] then
p.font.usedglyphs[index] = {index, math.floor(c.width * 1000 / f.size / p.font.extend + .5), c.tounicode}
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end
else
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p.pending[#p.pending+1] = pdf_escape(string.char(getchar(n)))
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if not p.font.usedglyphs[getchar(n)] then
p.font.usedglyphs[getchar(n)] = {getchar(n), math.floor(c.width * 1000 / f.size / p.font.extend + .5), c.tounicode}
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end
end
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p.pos.x = p.pos.x + math.floor(getwidth(n)*(1+getexpansion(n)/1000000)+.5)
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end
function nodehandler.whatsit(p, n, ...) -- Whatsit?
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local prop = properties[n]-- or node.getproperty(n)
if prop and prop.handle then
prop:handle(p, n, ...)
else
write("Invalid whatsit found (missing handler).")
end
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end
local global_p, global_x, global_y
function pdf._latelua(p, x, y, func, ...)
global_p, global_x, global_y = p, x, y
return func(...)
end
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function pdf.write_matrix(a, b, c, d, e, f, p)
e, f, p = e or 0, f or 0, p or global_p
local pending = p.pending_matrix
if p.mode ~= cm_pending then
topage(p)
p.mode = cm_pending
else
a, b = projected_point(pending, a, b, 0)
c, d = projected_point(pending, c, d, 0)
e, f = projected_point(pending, e, f, 1)
end
pending[1], pending[2], pending[3], pending[4], pending[5], pending[6] = a, b, c, d, e, f
end
local write_matrix = pdf.write_matrix
function pdf.write(mode, text, x, y, p)
x, y, p = x or global_x, y or global_y, p or global_p
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if mode == "page" then
topage(p)
p.strings[#p.strings + 1] = text
elseif mode == "text" then
topage(p)
p.strings[#p.strings + 1] = text
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elseif mode == "direct" then
if p.mode ~= page then
totext(p, p.font.fid)
end
p.strings[#p.strings + 1] = text
elseif mode == "origin" then
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write_matrix(1, 0, 0, 1, x, y, p)
topage(p)
p.strings[#p.strings + 1] = text
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write_matrix(1, 0, 0, 1, -x, -y, p)
else
write(format('Literal type %s unsupported', mode))
end
end
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local ondemandmeta = {
__index = function(t, k)
t[k] = {}
return t[k]
end
}
local function writeresources(p)
local resources = p.resources
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local result = {}
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for kind, t in pairs(resources) do if next(t) then
result[#result+1] = format("/%s<<", kind)
for name, value in pairs(t) do
result[#result+1] = format("/%s %i 0 R", name, value)
t[name] = nil
end
result[#result+1] = ">>"
end end
return concat(result)
end
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local function nodewriter(file, n, fontdirs, usedglyphs, colorstacks)
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n = todirect(n)
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setmetatable(usedglyphs, ondemandmeta)
local p = {
is_page = not not colorstacks,
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file = file,
mode = 3,
strings = {},
pending = {},
pos = {},
font = {},
vfont = {},
matrix = {1, 0, 0, 1, 0, 0},
pending_matrix = {},
resources = setmetatable({}, ondemandmeta),
annots = {},
linkcontext = file.linkcontext,
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fontdirs = fontdirs,
usedglyphs = usedglyphs,
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}
if colorstacks then
for i=1, #colorstacks do
local colorstack = colorstacks[i]
if colorstack.page then
local stack = colorstack.page_stack
if colorstack.default ~= stack[#stack] then
pdf.write(colorstack.mode, stack[#stack], 0, 0, p)
end
end
end
end
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nodehandler[getid(n)](p, n, 0, 0, n, nil, 0)
-- nodehandler[getid(n)](p, n, 0, getdepth(n), n)
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topage(p)
return concat(p.strings, '\n'), writeresources(p), (p.annots[1] and string.format("/Annots[%s]", table.concat(p.annots, ' ')) or "")
end
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require'luametalatex-pdf-savedbox':init_nodewriter(nodewriter)
return nodewriter