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--
-- luatexja/ltj-otf.lua
--
require('unicode')
require('lualibs')

luatexja.load_module('base');      local ltjb = luatexja.base
luatexja.load_module('jfont');     local ltjf = luatexja.jfont
luatexja.load_module('rmlgbm');    local ltjr = luatexja.rmlgbm
luatexja.load_module('charrange'); local ltjc = luatexja.charrange

local id_glyph = node.id('glyph')
local id_whatsit = node.id('whatsit')
local sid_user = node.subtype('user_defined')

local node_new = node.new
local node_remove = node.remove
local node_next = node.next
local node_free = node.free
local has_attr = node.has_attribute
local set_attr = node.set_attribute
local unset_attr = node.unset_attribute
local node_insert_after = node.insert_after
local identifiers = fonts.hashes.identifiers

local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
local attr_jchar_class = luatexbase.attributes['ltj@charclass']
local attr_yablshift = luatexbase.attributes['ltj@yablshift']
local attr_ykblshift = luatexbase.attributes['ltj@ykblshift']

local ltjf_font_metric_table = ltjf.font_metric_table
local ltjf_find_char_class = ltjf.find_char_class
local ltjr_cidfont_data = ltjr.cidfont_data
local ltjc_is_ucs_in_japanese_char = ltjc.is_ucs_in_japanese_char

local OTF = luatexja.userid_table.OTF

local function get_ucs_from_rmlgbm(c)
   local v = ltjr_cidfont_data["Adobe-Japan1"].resources.unicodes["Japan1." .. tostring(c)]
   if not v then -- AJ1 範囲外
      return 0
   elseif v<0xF0000 then -- 素直に Unicode にマップ可能
      return v
   else
      local w = ltjr_cidfont_data["Adobe-Japan1"].characters[v]. tounicode
      -- must be non-nil!
      local i = string.len(w)
      if i==4 then -- UCS2
         return tonumber(w,16)
      elseif i==8 then 
         i,w = tonumber(string.sub(w,1,4),16), tonumber(string.sub(w,-4),16)
         if (w>=0xD800) and (w<=0xDB7F) and (i>=0xDC00) and (i<=0xDFFF) then -- Surrogate pair
            return (w-0xD800)*0x400 + (i-0xDC00)
         else
            return 0
         end
      end
   end
end

-- Append a whatsit node to the list.
-- This whatsit node will be extracted to a glyph_node
local function append_jglyph(char)
   local p = node_new(id_whatsit,sid_user)
   local v = tex.attribute[attr_curjfnt]
   p.user_id=OTF; p.type=100; p.value=char
   set_attr(p, attr_yablshift, tex.attribute[attr_ykblshift])
   node.write(p)
end

local function cid(key)
   if key==0 then return append_jglyph(char) end
   local curjfnt = identifiers[tex.attribute[attr_curjfnt]]
   if not curjfnt.cidinfo or 
      curjfnt.cidinfo.ordering ~= "Japan1" and
      curjfnt.cidinfo.ordering ~= "GB1" and
      curjfnt.cidinfo.ordering ~= "CNS1" and
      curjfnt.cidinfo.ordering ~= "Korea1" then
--      ltjb.package_warning('luatexja-otf',
--			   'Current Japanese font (or other CJK font) "'
--			      ..curjfnt.psname..'" is not a CID-Keyed font (Adobe-Japan1 etc.)')
      return append_jglyph(get_ucs_from_rmlgbm(key))
   end
   local char = curjfnt.resources.unicodes[curjfnt.cidinfo.ordering..'.'..tostring(key)]
   if not char then
      ltjb.package_warning('luatexja-otf',
                           'Current Japanese font (or other CJK font) "'
                              ..curjfnt.psname..'" does not have the specified CID character ('
                              ..tostring(key)..')', 
                           'Use a font including the specified CID character.')
      char = 0
   end
   return append_jglyph(char)
end

local function extract(head)
   local p = head
   local v
   while p do
      if p.id==id_whatsit then
	 if p.subtype==sid_user and p.user_id==OTF then
	    local g = node_new(id_glyph)
	    g.subtype = 0; g.char = p.value
	    v = has_attr(p, attr_curjfnt); g.font = v
	    set_attr(g, attr_curjfnt, v)
	    v = has_attr(p, attr_yablshift)
	    if v then 
	       set_attr(g, attr_yablshift, v)
	    else
	       unset_attr(g, attr_yablshift)
	    end
	    head = node_insert_after(head, p, g)
	    head = node_remove(head, p)
	    node_free(p); p = g
	 end
      end
      p = node_next(p)
   end
   return head
end

luatexbase.add_to_callback('hpack_filter', 
   function (head) return extract(head) end,'ltj.hpack_filter_otf',
   luatexbase.priority_in_callback('pre_linebreak_filter',
				   'ltj.pre_linebreak_filter'))
luatexbase.add_to_callback('pre_linebreak_filter', 
   function (head) return extract(head) end, 'ltj.pre_linebreak_filter_otf',
   luatexbase.priority_in_callback('pre_linebreak_filter',
				   'ltj.pre_linebreak_filter'))


-- additional callbacks
-- 以下は,LuaTeX-ja に用意された callback のサンプルになっている.
--   JFM の文字クラスの指定の所で,"AJ1-xxx" 形式での指定を可能とした.
--   これらの文字指定は,和文フォント定義ごとに,それぞれのフォントの
--   CID <-> グリフ 対応状況による変換テーブルが用意される.

-- 和文フォント読み込み時に,CID -> unicode 対応をとっておく.
local function cid_to_char(fmtable, fn)
   local fi = identifiers[fn]
   if fi.cidinfo and fi.cidinfo.ordering == "Japan1" then
      fmtable.cid_char_type = {}
      for i, v in pairs(fmtable.chars) do
	 local j = string.match(i, "^AJ1%-([0-9]*)")
	 if j then
	    j = tonumber(fi.resources.unicodes['Japan1.'..tostring(j)])
	    if j then
	       fmtable.cid_char_type[j] = v 
	    end
	 end
      end
   end
   return fmtable
end
luatexbase.add_to_callback("luatexja.define_jfont", 
			   cid_to_char, "ltj.otf.define_jfont", 1)
--  既に読み込まれているフォントに対しても,同じことをやらないといけない
for fn, v in pairs(ltjf_font_metric_table) do
   ltjf_font_metric_table[fn] = cid_to_char(v, fn)
end


local function cid_set_char_class(arg, fmtable, char)
   if arg~=0 then return arg
   elseif fmtable.cid_char_type then
      return fmtable.cid_char_type[char] or 0
   else return 0
   end
end
luatexbase.add_to_callback("luatexja.find_char_class", 
			   cid_set_char_class, "ltj.otf.find_char_class", 1)

-------------------- IVS
local font_ivs_table = {} -- key: fontnumber
local enable_ivs
do
   local is_ivs_enabled = false
   local ivs -- temp table
   local sort = table.sort
   local uniq_flag
   local function add_ivs_table(tg, unitable)
      for gu, gv in pairs(tg) do
         local ga = gv.altuni
         if ga then
	    for _,at in pairs(ga) do
	       local bu, vsel = at.unicode, (at.variant or -1)
	       if vsel~=-1 then
		  if vsel>=0xE0100 then vsel = vsel - 0xE0100 end
	          if not ivs[bu] then ivs[bu] = {} end
	          uniq_flag = true
                  for i,_ in pairs(ivs[bu]) do
                     if i==vs then uniq_flag = false; break end
                  end
	          if uniq_flag then 
                     ivs[bu][vsel] = unitable[gv.name]
                  end
	       end
	    end
         end
      end
   end
   local function make_ivs_table(id, fname)
      ivs = {}
      local fl = fontloader.open(fname)
      local ft = fontloader.to_table(fl)
      local unicodes = id.resources.unicodes
      add_ivs_table(ft.glyphs, id.resources.unicodes)
      if ft.subfonts then
         for _,v in pairs(ft.subfonts) do
            add_ivs_table(v.glyphs, id.resources.unicodes)
         end
      end
      fontloader.close(fl)
      return ivs
   end

-- loading and saving
   local font_ivs_basename = {} -- key: basename
   local cache_ver = 4
   local checksum = file.checksum

   local function prepare_ivs_data(n, id)
      -- test if already loaded
      if type(id)=='number' then -- sometimes id is an integer
         font_ivs_table[n] = font_ivs_table[id]; return
      elseif not id then return
      end
      local fname = id.filename
      local bname = file.basename(fname)
      if not fname then 
         font_ivs_table[n] = {}; return
      elseif font_ivs_basename[bname] then 
         font_ivs_table[n] = font_ivs_basename[bname]; return
      end
      
      -- if the cache is present, read it
      local newsum = checksum(fname) -- MD5 checksum of the fontfile
      local v = "ivs_" .. string.lower(file.nameonly(fname))
      local dat = ltjb.load_cache(v, 
         function (t) return (t.version~=cache_ver) or (t.chksum~=newsum) end
      )
      -- if the cache is not found or outdated, save the cache
      if dat then 
	 font_ivs_basename[bname] = dat[1] or {}
      else
	 dat = make_ivs_table(id, fname)
	 font_ivs_basename[bname] = dat or {}
	 ltjb.save_cache( v,
			  {
			     chksum = checksum(fname), 
			     version = cache_ver,
			     dat,
			  })
      end
      font_ivs_table[n] = font_ivs_basename[bname]
   end

-- 組版時
   local function ivs_jglyph(char, bp, pf)
      local p = node_new(id_whatsit,sid_user)
      p.user_id=OTF; p.type=100; p.value=char
      set_attr(p, attr_curjfnt, pf)
      set_attr(p, attr_yablshift, has_attr(bp, attr_ykblshift) or 0)
      return p
   end

   local function do_ivs_repr(head)
      local p = head
      while p do
	 local pid = p.id
	 if pid==id_glyph then
            local pf = p.font
            if (has_attr(p, attr_curjfnt) or 0) == pf  then
               -- only works with JAchars
               local q = node_next(p) -- the next node of p
               if q and q.id==id_glyph then
                  local qc = q.char
                  if (qc>=0xFE00 and qc<=0xFE0F) or (qc>=0xE0100 and qc<0xE01F0) then 
		     -- q is a variation selector
		     if qc>=0xE0100 then qc = qc - 0xE0100 end
                     local pt = font_ivs_table[pf]
                     pt = pt and pt[p.char];  pt = pt and  pt[qc]
                     head = node_remove(head,q)
                     if pt then
                        local np = ivs_jglyph(pt, p, pf)
                        head = node_insert_after(head, p, np) 
                        head = node_remove(head,p)
                        p = np
                     end
                  end
               end
            end
         end
	 p = node_next(p)
      end
      return head
   end

   -- font define
   local function font_callback(name, size, id, fallback)
      local d = fallback(name, size, id)
      prepare_ivs_data(id, d)
      return d
   end

   enable_ivs = function ()
      if is_ivs_enabled then
	 ltjb.package_warning('luatexja-otf',
			      'luatexja.otf.enable_ivs() was already called, so this call is ignored', '')
      else
	 luatexbase.add_to_callback('hpack_filter', 
				    function (head) return do_ivs_repr(head) end,'do_ivs', 1)
	 luatexbase.add_to_callback('pre_linebreak_filter', 
				    function (head) return do_ivs_repr(head) end, 'do_ivs', 1)
	 local ivs_callback = function (name, size, id)
	    return font_callback(
	       name, size, id, 
	       function (name, size, id) return luatexja.font_callback(name, size, id) end
	    )
	 end
	 luatexbase.add_to_callback('define_font',ivs_callback,"luatexja.ivs_font_callback", 1)
	 for i=1,font.nextid()-1 do
	    if identifiers[i] then prepare_ivs_data(i, identifiers[i]) end
	 end
	 is_ivs_enabled = true
      end
   end
end

luatexja.otf = {
  append_jglyph = append_jglyph,
  enable_ivs = enable_ivs,  -- 隠し機能: IVS
  font_ivs_table = font_ivs_table,
  cid = cid,
}

-- EOF