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--
-- luatexja/math.lua
--
luatexbase.provides_module({
name = 'luatexja.math',
date = '2012/07/19',
version = '0.2',
description = 'Handling routines for Japanese characters in math mode',
})
module('luatexja.math', package.seeall)
luatexja.load_module('base'); local ltjb = luatexja.base
luatexja.load_module('charrange'); local ltjc = luatexja.charrange
luatexja.load_module('jfont'); local ltjf = luatexja.jfont
luatexja.load_module('stack'); local ltjs = luatexja.stack
luatexja.load_module('setwidth'); local ltjw = luatexja.setwidth
local node_new = node.new
local node_next = node.next
local node_free = node.free
local has_attr = node.has_attribute
local set_attr = node.set_attribute
local tex_getcount = tex.getcount
local attr_jchar_class = luatexbase.attributes['ltj@charclass']
local attr_icflag = luatexbase.attributes['ltj@icflag']
local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
local attr_jfam = luatexbase.attributes['jfam']
local attr_yablshift = luatexbase.attributes['ltj@yablshift']
local id_glyph = node.id('glyph')
local id_hlist = node.id('hlist')
local id_vlist = node.id('vlist')
local id_mchar = node.id('math_char')
local id_sub_box = node.id('sub_box')
local id_radical = node.id('radical')
local id_choice = node.id('choice')
local id_accent = node.id('accent')
local id_style = node.id('style')
local id_frac = node.id('fraction')
local id_simple = node.id('noad')
local id_sub_mlist = node.id('sub_mlist')
local PROCESSED = 8
local ltjf_font_metric_table = ltjf.font_metric_table
local ltjf_find_char_class = ltjf.find_char_class
-- table of mathematical characters
is_math_letters = {}
local conv_jchar_to_hbox_A
-- sty : 0 (display or text), 1 (script), >=2 (scriptscript)
local function conv_jchar_to_hbox(head, sty)
local p = head
local bhead = head
while p do
if p.id == id_simple or p.id == id_accent then
p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
elseif p.id == id_choice then
p.display = conv_jchar_to_hbox(p.display, 0)
p.text = conv_jchar_to_hbox(p.text, 0)
p.script = conv_jchar_to_hbox(p.script, 1)
p.scriptscript = conv_jchar_to_hbox(p.scriptscript, 2)
elseif p.id == id_frac then
p.num = conv_jchar_to_hbox_A(p.num, sty + 1)
p.denom = conv_jchar_to_hbox_A(p.denom, sty + 1)
elseif p.id == id_radical then
p.nucleus = conv_jchar_to_hbox_A(p.nucleus, sty)
p.sub = conv_jchar_to_hbox_A(p.sub, sty + 1)
p.sup = conv_jchar_to_hbox_A(p.sup, sty + 1)
if p.degree then
p.degree = conv_jchar_to_hbox_A(p.degree, sty + 1)
end
elseif p.id == id_style then
if p.style == "display'" or p.style == 'display'
or p.style == "text'" or p.style == 'text' then
sty = 0
elseif p.style == "script'" or p.style == 'script' then
sty = 1
else sty = 2
end
end
p = node.next(p)
end
return head
end
conv_jchar_to_hbox_A =
function (p, sty)
if not p then return nil
elseif p.id == id_sub_mlist then
if p.head then
p.head = conv_jchar_to_hbox(p.head, sty)
end
elseif p.id == id_mchar then
local fam = has_attr(p, attr_jfam) or -1
if (not is_math_letters[p.char]) and ltjc.is_ucs_in_japanese_char(p) and fam>=0 then
local mode = 'mjss'
if sty == 0 then mode = 'mjtext'
elseif sty == 1 then mode = 'mjscr'
end
local f = ltjs.get_penalty_table(mode, fam, -1, tex_getcount('ltj@@stack'))
if f ~= -1 then
local q = node_new(id_sub_box)
local r = node_new(id_glyph); r.next = nil
r.char = p.char; r.font = f; r.subtype = 256
set_attr(r, attr_ykblshift, 0)
set_attr(r, attr_icflag, PROCESSED)
local met = ltjf_font_metric_table[f]
ltjw.head = r; ltjw.capsule_glyph(r, tex.mathdir , true, met, ltjf_find_char_class(p.char, met));
q.head = ltjw.head; node_free(p); p=q;
end
end
end
return p
end
luatexbase.add_to_callback('mlist_to_hlist',
function (n, display_type, penalties)
local head = conv_jchar_to_hbox(n, 0);
head = node.mlist_to_hlist(head, display_type, penalties)
return head
end,'ltj.mlist_to_hlist', 1)
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