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Added cache tables of JFM for speed. (quick fix)
[luatex-ja/luatexja.git] / 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 local attr_yablshift = luatexbase.attributes['ltj@yablshift']
29
30 local id_glyph = node.id('glyph')
31 local id_hlist = node.id('hlist')
32 local id_vlist = node.id('vlist')
33 local id_mchar = node.id('math_char')
34 local id_sub_box = node.id('sub_box')
35 local id_radical = node.id('radical')
36 local id_choice  = node.id('choice')
37 local id_accent  = node.id('accent')
38 local id_style   = node.id('style')
39 local id_frac    = node.id('fraction')
40 local id_simple  = node.id('noad')
41 local id_sub_mlist = node.id('sub_mlist')
42
43 local PROCESSED = 8
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.text = conv_jchar_to_hbox(p.text, 0)
58          p.script = conv_jchar_to_hbox(p.script, 1)
59          p.scriptscript = conv_jchar_to_hbox(p.scriptscript, 2)
60       elseif p.id == id_frac then
61          p.num = conv_jchar_to_hbox_A(p.num, sty + 1)
62          p.denom = conv_jchar_to_hbox_A(p.denom, sty + 1)
63       elseif p.id == id_radical then
64          p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
65          p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
66          p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
67          if p.degree then
68             p.degree = conv_jchar_to_hbox_A(p.degree, sty + 1)
69          end
70       elseif p.id == id_style then
71          if p.style == "display'" or  p.style == 'display'
72             or  p.style == "text'" or  p.style == 'text' then
73             sty = 0
74          elseif  p.style == "script'" or  p.style == 'script' then
75             sty = 1
76          else sty = 2
77          end
78        end
79        p = node.next(p)
80    end 
81    return head
82 end 
83
84 conv_jchar_to_hbox_A = 
85 function (p, sty)
86    if not p then return nil
87    elseif p.id == id_sub_mlist then
88       if p.head then
89          p.head = conv_jchar_to_hbox(p.head, sty)
90       end
91    elseif p.id == id_mchar then
92       local fam = has_attr(p, attr_jfam) or -1
93       if ltjc.is_ucs_in_japanese_char(p) and fam>=0 then
94          local mode = 'mjss'
95          if sty == 0 then mode = 'mjtext'
96          elseif sty == 1 then mode = 'mjscr'
97          end
98          local f = ltjs.get_penalty_table(mode, fam, -1, tex.getcount('ltj@@stack'))
99          if f ~= -1 then
100             local q = node_new(id_sub_box)
101             local r = node_new(id_glyph); r.next = nil
102             r.char = p.char; r.font = f; r.subtype = 256
103             set_attr(r, attr_icflag, PROCESSED)
104             set_attr(r, attr_yablshift, 0)
105             local class = ltjf.find_char_class(p.char, ltjf.font_metric_table[f].jfm)
106             set_attr(r, attr_jchar_class, class)
107             local met = ltjf.font_metric_table[f]
108             ltjw.char_data = ltjf.metrics[met.jfm].size_cache[met.size].char_type[class]
109             ltjw.head = r; ltjw.capsule_glyph(r, tex.mathdir , true);
110             q.head = ltjw.head; node_free(p); p=q;
111          end
112       end
113    end
114    return p
115 end
116
117 luatexbase.add_to_callback('mlist_to_hlist', 
118    function (n, display_type, penalties)
119       local head = conv_jchar_to_hbox(n, 0);
120       head = node.mlist_to_hlist(head, display_type, penalties)
121       return head
122    end,'ltj.mlist_to_hlist', 1)