src/luatexja/otf.lua

   1 --
   2 -- luatexja/otf.lua
   3 --
   4 luatexbase.provides_module({
   5   name = 'luatexja.otf',
   6   date = '2011/09/09',
   7   version = '0.1',
   8   description = 'The OTF Lua module for LuaTeX-ja',
   9 })
  10 module('luatexja.otf', package.seeall)
  11
  12 require('luatexja.base');      local ltjb = luatexja.base
  13 require('luatexja.jfont');     local ltjf = luatexja.jfont
  14
  15 local id_glyph = node.id('glyph')
  16 local id_whatsit = node.id('whatsit')
  17 local sid_user = node.subtype('user_defined')
  18
  19 local node_new = node.new
  20 local node_remove = node.remove
  21 local node_next = node.next
  22 local node_free = node.free
  23 local has_attr = node.has_attribute
  24 local set_attr = node.set_attribute
  25 local unset_attr = node.unset_attribute
  26 local node_insert_after = node.insert_after
  27
  28 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
  29 local attr_jchar_class = luatexbase.attributes['ltj@charclass']
  30 local attr_yablshift = luatexbase.attributes['ltj@yablshift']
  31 local attr_ykblshift = luatexbase.attributes['ltj@ykblshift']
  32
  33 -- Append a whatsit node to the list.
  34 -- This whatsit node will be extracted to a glyph_node
  35 function append_jglyph(char)
  36    local p = node_new(id_whatsit,sid_user)
  37    local v = tex.attribute[attr_curjfnt]
  38    p.user_id=30113; p.type=100; p.value=char
  39    set_attr(p, attr_yablshift, tex.attribute[attr_ykblshift])
  40    node.write(p)
  41 end
  42
  43 function cid(key)
  44    local curjfnt = fonts.ids[tex.attribute[attr_curjfnt]]
  45    if curjfnt.cidinfo.ordering ~= "Japan1" then
  46       ltjb.package_error('luatexja-otf',
  47                          'Current Japanese font "'..curjfnt.psname..'" is not a CID-Keyed font (Adobe-Japan1)',
  48                          'Select a CID-Keyed font using \jfont.')
  49       return
  50    end
  51    local char = curjfnt.unicodes['Japan1.'..tostring(key)]
  52    if not char then
  53       ltjb.package_error('luatexja-otf',
  54                          'Current Japanese font "'..curjfnt.psname..'" does not include the specified CID character ('..tostring(key)..')',
  55                          'Use a font including the specified CID character.')
  56       return
  57    end
  58    append_jglyph(char)
  59 end
  60
  61 function extract(head)
  62    local p = head, v
  63    while p do
  64       if p.id==id_whatsit then
  65          if p.subtype==sid_user and p.user_id==30113 then
  66             local g = node_new(id_glyph)
  67             g.subtype = 0; g.char = p.value
  68             v = has_attr(p, attr_curjfnt); g.font = v
  69             set_attr(g, attr_jchar_class,
  70                      ltjf.find_char_class(g.char, ltjf.font_metric_table[v].jfm))
  71             set_attr(g, attr_curjfnt, v)
  72             v = has_attr(p, attr_yablshift)
  73             if v then
  74                set_attr(g, attr_yablshift, v)
  75             else
  76                unset_attr(g, attr_yablshift)
  77             end
  78             head = node_insert_after(head, p, g)
  79             head = node_remove(head, p)
  80             node_free(p); p = g
  81          end
  82       end
  83       p = node_next(p)
  84    end
  85    return head
  86 end
  87
  88 luatexbase.add_to_callback('hpack_filter',
  89    function (head) return extract(head) end,'ltj.hpack_filter_otf',
  90    luatexbase.priority_in_callback('pre_linebreak_filter',
  91                                    'ltj.pre_linebreak_filter'))
  92 luatexbase.add_to_callback('pre_linebreak_filter',
  93    function (head) return extract(head) end, 'ltj.pre_linebreak_filter_otf',
  94    luatexbase.priority_in_callback('pre_linebreak_filter',
  95                                    'ltj.pre_linebreak_filter'))
  96
  97
  98 -------------------- all done
  99 -- EOF