src/luatexja/math.lua

   1 --
   2 -- luatexja/math.lua
   3 --
   4 luatexbase.provides_module({
   5   name = 'luatexja.math',
   6   date = '2011/08/14',
   7   version = '0.1',
   8   description = 'Handling routines for Japanese characters in math mode',
   9 })
  10 module('luatexja.math', package.seeall)
  11
  12 require('luatexja.base');      local ltjb = luatexja.base
  13 require('luatexja.charrange'); local ltjc = luatexja.charrange
  14 require('luatexja.jfont');     local ltjf = luatexja.jfont
  15 require('luatexja.stack');     local ltjs = luatexja.stack
  16 require('luatexja.setwidth');  local ltjw = luatexja.setwidth
  17
  18 local node_new = node.new
  19 local node_next = node.next
  20 local node_free = node.free
  21 local has_attr = node.has_attribute
  22 local set_attr = node.set_attribute
  23
  24 local attr_jchar_class = luatexbase.attributes['ltj@charclass']
  25 local attr_icflag = luatexbase.attributes['ltj@icflag']
  26 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
  27 local attr_jfam = luatexbase.attributes['jfam']
  28
  29 local id_glyph = node.id('glyph')
  30 local id_hlist = node.id('hlist')
  31 local id_vlist = node.id('vlist')
  32 local id_mchar = node.id('math_char')
  33 local id_sub_box = node.id('sub_box')
  34 local id_radical = node.id('radical')
  35 local id_choice  = node.id('choice')
  36 local id_accent  = node.id('accent')
  37 local id_style   = node.id('style')
  38 local id_frac    = node.id('fraction')
  39 local id_simple  = node.id('noad')
  40 local id_sub_mlist = node.id('sub_mlist')
  41
  42 local PROCESSED = 8
  43
  44 local conv_jchar_to_hbox_A
  45
  46 -- sty : 0 (display or text), 1 (script), >=2 (scriptscript)
  47 local function conv_jchar_to_hbox(head, sty)
  48    local p = head
  49    local bhead = head
  50    while p do
  51       if p.id == id_simple or p.id == id_accent then
  52          p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
  53          p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
  54          p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
  55       elseif p.id == id_choice then
  56          p.text = conv_jchar_to_hbox(p.text, 0)
  57          p.script = conv_jchar_to_hbox(p.script, 1)
  58          p.scriptscript = conv_jchar_to_hbox(p.scriptscript, 2)
  59       elseif p.id == id_frac then
  60          p.num = conv_jchar_to_hbox_A(p.num, sty + 1)
  61          p.denom = conv_jchar_to_hbox_A(p.denom, sty + 1)
  62       elseif p.id == id_radical then
  63          p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
  64          p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
  65          p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
  66          if p.degree then
  67             p.degree = conv_jchar_to_hbox_A(p.degree, sty + 1)
  68          end
  69       elseif p.id == id_style then
  70          if p.style == "display'" or  p.style == 'display'
  71             or  p.style == "text'" or  p.style == 'text' then
  72             sty = 0
  73          elseif  p.style == "script'" or  p.style == 'script' then
  74             sty = 1
  75          else sty = 2
  76          end
  77        end
  78        p = node.next(p)
  79    end
  80    return head
  81 end
  82
  83 conv_jchar_to_hbox_A =
  84 function (p, sty)
  85    if not p then return nil
  86    elseif p.id == id_sub_mlist then
  87       if p.head then
  88          p.head = conv_jchar_to_hbox(p.head, sty)
  89       end
  90    elseif p.id == id_mchar then
  91       local fam = has_attr(p, attr_jfam) or -1
  92       if ltjc.is_ucs_in_japanese_char(p) and fam>=0 then
  93          local mode = 'mjss'
  94          if sty == 0 then mode = 'mjtext'
  95          elseif sty == 1 then mode = 'mjscr'
  96          end
  97          local f = ltjs.get_penalty_table(mode, fam, -1, tex.getcount('ltj@@stack'))
  98          if f ~= -1 then
  99             local q = node_new(id_sub_box)
 100             local r = node_new(id_glyph); r.next = nil
 101             r.char = p.char; r.font = f; r.subtype = 256
 102             set_attr(r, attr_icflag, PROCESSED)
 103             local class = ltjf.find_char_class(p.char, ltjf.font_metric_table[f].jfm)
 104             set_attr(r, attr_jchar_class, class)
 105             ltjw.met_tb = ltjf.font_metric_table[f]
 106             ltjw.char_data = ltjf.metrics[ltjw.met_tb.jfm].char_type[class]
 107             ltjw.head = r; ltjw.capsule_glyph(r, tex.mathdir , true);
 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)