src/ltj-math.lua

   1 --
   2 -- luatexja/ltj-math.lua
   3 --
   4
   5 luatexja.load_module('base');      local ltjb = luatexja.base
   6 luatexja.load_module('charrange'); local ltjc = luatexja.charrange
   7 luatexja.load_module('jfont');     local ltjf = luatexja.jfont
   8 luatexja.load_module('stack');     local ltjs = luatexja.stack
   9 luatexja.load_module('setwidth');  local ltjw = luatexja.setwidth
  10
  11 local node_new = node.new
  12 local node_next = node.next
  13 local node_free = node.free
  14 local has_attr = node.has_attribute
  15 local set_attr = node.set_attribute
  16 local tex_getcount = tex.getcount
  17
  18 local attr_jchar_class = luatexbase.attributes['ltj@charclass']
  19 local attr_icflag = luatexbase.attributes['ltj@icflag']
  20 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
  21 local attr_jfam = luatexbase.attributes['jfam']
  22 local attr_yablshift = luatexbase.attributes['ltj@yablshift']
  23
  24 local id_glyph = node.id('glyph')
  25 local id_hlist = node.id('hlist')
  26 local id_vlist = node.id('vlist')
  27 local id_mchar = node.id('math_char')
  28 local id_sub_box = node.id('sub_box')
  29 local id_radical = node.id('radical')
  30 local id_choice  = node.id('choice')
  31 local id_accent  = node.id('accent')
  32 local id_style   = node.id('style')
  33 local id_frac    = node.id('fraction')
  34 local id_simple  = node.id('noad')
  35 local id_sub_mlist = node.id('sub_mlist')
  36
  37 local PROCESSED = luatexja.icflag_table.PROCESSED
  38
  39 local ltjf_font_metric_table = ltjf.font_metric_table
  40 local ltjf_find_char_class = ltjf.find_char_class
  41
  42 -- table of mathematical characters
  43 local is_math_letters = {}
  44
  45 local conv_jchar_to_hbox_A
  46
  47 -- sty : 0 (display or text), 1 (script), >=2 (scriptscript)
  48 local function conv_jchar_to_hbox(head, sty)
  49    local p = head
  50    local bhead = head
  51    while p do
  52       if p.id == id_simple or p.id == id_accent then
  53          p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
  54          p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
  55          p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
  56       elseif p.id == id_choice then
  57          p.display = conv_jchar_to_hbox(p.display, 0)
  58          p.text = conv_jchar_to_hbox(p.text, 0)
  59          p.script = conv_jchar_to_hbox(p.script, 1)
  60          p.scriptscript = conv_jchar_to_hbox(p.scriptscript, 2)
  61       elseif p.id == id_frac then
  62          p.num = conv_jchar_to_hbox_A(p.num, sty + 1)
  63          p.denom = conv_jchar_to_hbox_A(p.denom, sty + 1)
  64       elseif p.id == id_radical then
  65          p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
  66          p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
  67          p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
  68          if p.degree then
  69             p.degree = conv_jchar_to_hbox_A(p.degree, sty + 1)
  70          end
  71       elseif p.id == id_style then
  72          if p.style == "display'" or  p.style == 'display'
  73             or  p.style == "text'" or  p.style == 'text' then
  74             sty = 0
  75          elseif  p.style == "script'" or  p.style == 'script' then
  76             sty = 1
  77          else sty = 2
  78          end
  79        end
  80        p = node.next(p)
  81    end
  82    return head
  83 end
  84
  85 local MJT  = luatexja.stack_table_index.MJT
  86 local MJS  = luatexja.stack_table_index.MJS
  87 local MJSS = luatexja.stack_table_index.MJSS
  88
  89 conv_jchar_to_hbox_A =
  90 function (p, sty)
  91    if not p then return nil
  92    elseif p.id == id_sub_mlist then
  93       if p.head then
  94          p.head = conv_jchar_to_hbox(p.head, sty)
  95       end
  96    elseif p.id == id_mchar then
  97       local fam = has_attr(p, attr_jfam) or -1
  98       if (not is_math_letters[p.char]) and ltjc.is_ucs_in_japanese_char(p) and fam>=0 then
  99          local f = ltjs.get_penalty_table(MJT + 0x100 * sty + fam, -1, tex_getcount('ltj@@stack'))
 100          if f ~= -1 then
 101             local q = node_new(id_sub_box)
 102             local r = node_new(id_glyph); r.next = nil
 103             r.char = p.char; r.font = f; r.subtype = 256
 104             set_attr(r, attr_ykblshift, 0)
 105             set_attr(r, attr_icflag, PROCESSED)
 106             local met = ltjf_font_metric_table[f]
 107             ltjw.head = r; ltjw.capsule_glyph(r, tex.mathdir , true, met, ltjf_find_char_class(p.char, met));
 108             q.head = ltjw.head; node_free(p); p=q;
 109          end
 110       end
 111    end
 112    return p
 113 end
 114
 115 luatexbase.add_to_callback('mlist_to_hlist',
 116    function (n, display_type, penalties)
 117       local head = conv_jchar_to_hbox(n, 0);
 118       head = node.mlist_to_hlist(head, display_type, penalties)
 119       return head
 120    end,'ltj.mlist_to_hlist', 1)
 121
 122 luatexja.math = { is_math_letters = is_math_letters }