--
-- luatexja/rmlgbm.lua
--
luatexbase.provides_module({
  name = 'luatexja.rmlgbm',
  date = '2012/04/21',
  version = '0.3',
  description = 'Definitions of non-embedded Japanese (or other CJK) fonts',
})
module('luatexja.rmlgbm', package.seeall)
local err, warn, info, log = luatexbase.errwarinf(_NAME)

luatexja.load_module('base');      local ltjb = luatexja.base

local cidfont_data = {}
local cache_chars = {}
local path           = {
    localdir  = file.join(kpse.expand_var("$TEXMFVAR"), aux_dir),
    systemdir = file.join(kpse.expand_var("$TEXMFSYSVAR"), aux_dir),
}

local cid_reg, cid_order, cid_supp, cid_name
local taux_dir = 'luatex-cache/luatexja'
local cid_replace = {
   ["Adobe-Japan1"] = {"UniJIS-UTF32", 23057, "UniJIS2004-UTF32"},
                       -- 基本的には JIS X 0208:1990 に沿ったマッピングだが
                       -- JIS X 0213:2004 のみにある字はそっちを使う
   ["Adobe-Korea1"] = {"UniKS-UTF32",  18351},
   ["Adobe-GB1"]    = {"UniGB-UTF32",  30283},
   ["Adobe-CNS1"]   = {"UniCNS-UTF32", 19155},
}

-- reading CID maps
do
   local line, fh -- line, file handler
   local tt, cidm  -- characters, cid->glyph_index
   
   local function load_cid_char(cid_dec, mke)
      local cid, ucs, ucsa
      line = fh:read("*l")
      while line do
         if string.find(line, "end...?char") then 
            line = fh:read("*l"); return
         else -- WMA l is in the form "<%x+>%s%d+"
            ucs, cid = string.match(line, "<(%x+)>%s+<?(%x+)>?")
            cid = cid_dec(cid); ucs = tonumber(ucs, 16); 
            if not tt[ucs]  then 
               tt[ucs] = mke(cid); cidm[cid]=ucs
            end
         end
         line = fh:read("*l")
      end
   end

   local function load_cid_range(inc, cid_dec, mke)
      local bucs, eucs, cid
      line = fh:read("*l")
      while line do
        if string.find(line, "end...?range") then 
            line = fh:read("*l"); return
         else -- WMA l is in the form "<%x+>%s+<%x+>"
            bucs, eucs, cid = string.match(line, "<(%x+)>%s+<(%x+)>%s+<?(%x+)>?")
            cid = cid_dec(cid); 
	    bucs = tonumber(bucs, 16); eucs = tonumber(eucs, 16)
            for ucs = bucs, eucs do
               if not tt[ucs]  then 
                  tt[ucs] = mke(cid); cidm[cid]=ucs
               end
               cid = inc(cid)
            end
         end
         line = fh:read("*l")
      end
   end

   local function open_cmap_file(name, inc, cid_dec, mke)
      fh = io.open(kpse.find_file(name, 'cmap files'), "r")
      line = fh:read("*l")
      while line do
         if string.find(line, "%x+%s+begin...?char") then
            load_cid_char(cid_dec, mke)
         elseif string.find(line, "%x+%s+begin...?range") then
            load_cid_range(inc, cid_dec, mke)
         else
            line = fh:read("*l")
         end
      end
      fh:close();  
   end
   
   local function increment(a) return a+1 end
   local function entry(a)     return {index = a} end
   function make_cid_font()
      cidfont_data[cid_name] = {
         cidinfo = { ordering=cid_order, registry=cid_reg, supplement=cid_supp },
         encodingbytes = 2, extend=1000, format = 'opentype',
         direction = 0, characters = {}, parameters = {}, embedding = "no", cache = "yes", 
         ascender = 0, descender = 0, factor = 0, hfactor = 0, vfactor = 0,
	 tounicode = 1,
      }

      -- CID => Unicode 負号空間
      -- TODO: vertical fonts?
      tt, cidm = {}, {}
      for i = 0,cid_replace[cid_name][2] do cidm[i] = -1 end
      open_cmap_file(cid_replace[cid_name][1] .. "-H",
		     increment, tonumber, entry)
      if cid_replace[cid_name][3] then
         open_cmap_file(cid_replace[cid_name][3] .. "-H",
			increment, tonumber, entry)
      end
      cidfont_data[cid_name].characters = tt

      -- Unicode にマップされなかった文字の処理
      -- これらは TrueType フォントを使って表示するときはおかしくなる
      local ttu, pricode = {}, 0xF0000
      for i,v in ipairs(cidm) do
         if v==-1 then 
            tt[pricode], cidm[i], pricode=  { index = i }, pricode, pricode+1;
         end
         ttu[cid_order .. '.' .. i] = cidm[i]
      end
      cidfont_data[cid_name].unicodes = ttu      
      cache_chars[cid_name]  = { [655360] = cidfont_data[cid_name].characters }

      -- tounicode エントリ
      local cidp = {nil, nil}; local cidmo = cidm
      tt, ttu, cidm = {}, {}, {}
      open_cmap_file(cid_name .. "-UCS2",
		     function(a) 
			a[2] = a[2] +1 ; return a
		     end, 
		     function(a) 
			cidp[1] = string.upper(string.sub(a,1,string.len(a)-4))
			cidp[2] = tonumber(string.sub(a,-4),16)
			return cidp
		     end,
		     function(a) return a[1] ..string.format('%04X',a[2])  end)
      -- tt は cid -> tounicode になっているので cidm -> tounicode に変換
      for i,v in ipairs(cidmo) do
	 if v>=0xF0000 then
	    cidfont_data[cid_name].characters[v].tounicode = tt[i]
	 end
      end

      -- Save
      local savepath  = path.localdir .. '/luatexja/'
      if not lfs.isdir(savepath) then
         dir.mkdirs(savepath)
      end
      savepath = file.join(savepath, "ltj-cid-auto-" 
                           .. string.lower(cid_name)  .. ".lua")
      if file.iswritable(savepath) then
         cidfont_data[cid_name].characters[46].width = math.floor(655360/14);
	 -- Standard fonts are ``seriffed''. 
         table.tofile(savepath, cidfont_data[cid_name],'return', false, true, false )
      else 
         ltjb.package_warning('luatexja', 
                              'failed to save informations of non-embedded 2-byte fonts', '')
      end
   end
end
local make_cid_font = make_cid_font

-- 
local function read_cid_font()
   -- local v = "ltj-cid-" .. string.lower(cid_name) .. ".lua"
   local v = "ltj-cid-auto-" .. string.lower(cid_name) .. ".lua"
   local localpath  = file.join(path.localdir, v)
   local systempath = file.join(path.systemdir, v)
   local kpsefound  = kpse.find_file(v)
   if kpsefound and file.isreadable(kpsefound) then
      cidfont_data[cid_name] = require(kpsefound)
      cache_chars[cid_name]  = { [655360] = cidfont_data[cid_name].characters }
   elseif file.isreadable(localpath)  then
      cidfont_data[cid_name] = require(localpath)
      cache_chars[cid_name]  = { [655360] = cidfont_data[cid_name].characters }
   elseif file.isreadable(systempath) then
      cidfont_data[cid_name] = require(systempath)
      cache_chars[cid_name]  = { [655360] = cidfont_data[cid_name].characters }
   end
   -- Now we must create the virtual metrics from CMap.
   ltjb.package_info('luatexja', 
			'I try to generate informations of non-embedded 2-byte fonts...', '')
   make_cid_font()

   if cidfont_data[cid_name] then
      for i,v in pairs(cidfont_data[cid_name].characters) do
         if not v.width then v.width = 655360 end
         v.height, v.depth = 576716.8, 78643.2 -- optimized for jfm-ujis.lua
      end
   end
end

-- High-level
local function mk_rml(name, size, id)
   local specification = fonts.define.analyze(name,size)
   specification = fonts.define.specify[':'](specification)
   local features = specification.features.normal

   local fontdata = {}
   local cachedata = {}
   local s = cidfont_data[cid_name]
   for k, v in pairs(s) do
      fontdata[k] = v
      cachedata[k] = v
   end
   fontdata.characters = nil
   cachedata.characters = nil
   fontdata.unicodes = nil
   fontdata.shared = nil
   cachedata.shared = nil
   if s.shared then
      cachedata.shared = {}
      local shared = cachedata.shared
      for k, v in pairs(s.shared) do
	 shared[k] = v
      end
      
      shared.set_dynamics = fonts.otf.set_dynamics 
      shared.processes, shared.features = fonts.otf.set_features(cachedata,fonts.define.check(features,fonts.otf.features.default))
   end

   -- characters & scaling
   if size < 0 then size = -size * 655.36 end
   local scale = size / 655360
   local def_height =  0.88 * size -- character's default height (optimized for jfm-ujis.lua)
   local def_depth =  0.12 * size  -- and depth.
   if not cache_chars[cid_name][size] then
      cache_chars[cid_name][size]  = {}
      for k, v in pairs(cache_chars[cid_name][655360]) do
         cache_chars[cid_name][size][k] = { 
	    index = v.index, width = v.width * scale, 
	    height = def_height, depth = def_depth, tounicode = v.tounicode,
	 }
      end
   end
   fontdata.characters = cache_chars[cid_name][size]
   cachedata.characters = cache_chars[cid_name][size]

   local parameters = {}
   for k, v in pairs(s.parameters) do
      parameters[k] = v * scale
   end
   fontdata.parameters = parameters;                cachedata.parameters = parameters
   fontdata.ascender = fontdata.ascender * scale;   cachedata.ascender = fontdata.ascender
   fontdata.descender = fontdata.descender * scale; cachedata.descender = fontdata.descender
   fontdata.factor = fontdata.factor * scale;       cachedata.factor = fontdata.factor
   fontdata.hfactor = fontdata.hfactor * scale;     cachedata.hfactor = fontdata.hfactor
   fontdata.vfactor = fontdata.vfactor * scale;     cachedata.vfactor = fontdata.vfactor
   fontdata.size = size;                            cachedata.size = size

   -- no embedding
   local var = ''
   if features.slant then 
      fontdata.slant = features.slant*1000;         cachedata.slant = fontdata.slant
      var = var .. 's' .. tostring(features.slant)
   end
   if features.extend then 
      fontdata.extend = features.extend*1000;       cachedata.extend = fontdata.extend
       var = var .. 'x' .. tostring(features.extend)
  end
   fontdata.name = specification.name .. size .. var; cachedata.name = fontdata.name
   fontdata.fullname = specification.name .. var; cachedata.fullname = fontdata.fullname
   fontdata.psname = specification.name; cachedata.psname = fontdata.psname
   fonts.ids[id] = cachedata

   return fontdata
end

local dr_orig = fonts.define.read
function fonts.define.read(name, size, id)
   local p = utf.find(name, ":") or utf.len(name)+1
   if utf.sub(name, 1, p-1) == 'psft' then
      local s = "Adobe-Japan1-6"
      local basename = utf.sub(name,p+1)
      local p = utf.find(basename, ":")
      if p then 
	 local xname = utf.sub(basename, p+1)
	 p = 1
	 while p do
	    local q = utf.find(xname, ";", p+1) or utf.len(xname)+1
	    if utf.sub(xname, p, p+3)=='cid=' and q>p+4 then
	       s = utf.sub(xname, p+4, q-1)
	    end
	    if utf.len(xname)+1==q then p = nil else p = q + 1 end
	 end
      end
      cid_reg, cid_order = string.match(s, "^(.-)%-(.-)%-(%d-)$")
      if not cid_reg then 
         cid_reg, cid_order = string.match(s, "^(.-)%-(.-)$")
      end
      cid_name = cid_reg .. '-' .. cid_order
      if not cidfont_data[cid_name] then 
         read_cid_font()
         if not cidfont_data[cid_name] then 
            ltjb.package_error('luatexja',
                               "bad cid key `" .. s .. "'",
                               "I couldn't find any non-embedded font information for the CID\n" ..
                                  '`' .. s .. "'. For now, I'll use `Adobe-Japan1-6'.\n"..
                                  'Please contact the LuaTeX-ja project team.')
            cid_name = "Adobe-Japan1"
         end
      end
      return mk_rml(basename, size, id)
   else 
      return dr_orig(name, size, id)
   end
end

cid_reg, cid_order, cid_name = 'Adobe', 'Japan1', 'Adobe-Japan1'
read_cid_font()