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--
-- ltj-math.lua
--
luatexja.load_module('base'); local ltjb = luatexja.base
luatexja.load_module('direction'); local ltjd = luatexja.direction
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 setfield = node.direct.setfield
local getfield = node.direct.getfield
local getid = node.direct.getid
local getsubtype = node.direct.getsubtype
local getlist = node.direct.getlist
-- getlist cannot be used for sub_box nodes. Use instead λp. getfield(p, 'head')
local getchar = node.direct.getchar
local to_node = node.direct.tonode
local to_direct = node.direct.todirect
local node_traverse = node.direct.traverse
local node_new = node.direct.new
local node_next = node.direct.getnext
local node_remove = node.direct.remove
local node_free = node.direct.free
local has_attr = node.direct.has_attribute
local set_attr = node.direct.set_attribute
local tex_getcount = tex.getcount
local attr_jchar_class = luatexbase.attributes['ltj@charclass']
local attr_dir = luatexbase.attributes['ltj@dir']
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 id_whatsit = node.id('whatsit')
local sid_user = node.subtype('user_defined')
local DIR = luatexja.userid_table.DIR
local dir_node_auto = luatexja.dir_table.dir_node_auto
local PROCESSED = luatexja.icflag_table.PROCESSED
local ltjf_font_metric_table = ltjf.font_metric_table
local ltjf_find_char_class = ltjf.find_char_class
local ltjd_get_dir_count = ltjd.get_dir_count
local ltjd_make_dir_whatsit = ltjd.make_dir_whatsit
-- table of mathematical characters
local is_math_letters = {}
local list_dir
-- vcenter noad は軸に揃えるため，欧文ベースライン補正がかかる
local function conv_vcenter(sb)
local h = getfield(sb, 'head');local hd = getlist(h)
if getid(hd)==id_whatsit and
getsubtype(hd)==sid_user and getfield(hd, 'user_id')==DIR then
local d = node_next(hd)
if getid(d)==id_vlist and has_attr(d, attr_dir)>=dir_node_auto then
node_free(hd); setfield(h, 'head', nil); node_free(h)
setfield(sb, 'head', d); set_attr(d, attr_icflag, 0)
end
end
return sb
end
local conv_jchar_to_hbox_A
-- sty : 0 (display or text), 1 (script), >=2 (scriptscript)
local function conv_jchar_to_hbox(head, sty)
for p in node_traverse(head) do
local pid = getid(p)
if pid == id_simple or pid == id_accent then
if getsubtype(p)==12 then
conv_vcenter(getfield(p, 'nucleus'))
else
setfield(p, 'nucleus', conv_jchar_to_hbox_A(getfield(p, 'nucleus'), sty))
end
setfield(p, 'sub', conv_jchar_to_hbox_A(getfield(p, 'sub'), sty+1))
setfield(p, 'sup', conv_jchar_to_hbox_A(getfield(p, 'sup'), sty+1))
elseif pid == id_choice then
setfield(p, 'display', conv_jchar_to_hbox_A(getfield(p, 'display'), 0))
setfield(p, 'text', conv_jchar_to_hbox_A(getfield(p, 'text'), 0))
setfield(p, 'script', conv_jchar_to_hbox_A(getfield(p, 'script'), 1))
setfield(p, 'scriptscript', conv_jchar_to_hbox_A(getfield(p, 'scriptscript'), 2))
elseif pid == id_frac then
setfield(p, 'num', conv_jchar_to_hbox_A(getfield(p, 'num'), sty+1))
setfield(p, 'denom', conv_jchar_to_hbox_A(getfield(p, 'denom'), sty+1))
elseif pid == id_radical then
setfield(p, 'nucleus', conv_jchar_to_hbox_A(getfield(p, 'nucleus'), sty))
setfield(p, 'sub', conv_jchar_to_hbox_A(getfield(p, 'sub'), sty+1))
setfield(p, 'sup', conv_jchar_to_hbox_A(getfield(p, 'sup'), sty+1))
if getfield(p, 'degree') then
setfield(p, 'degree', conv_jchar_to_hbox_A(getfield(p, 'degree'), sty + 1))
end
elseif pid == id_style then
local ps = getfield(p, 'style')
if ps == "display'" or ps == 'display'
or ps == "text'" or ps == 'text' then
sty = 0
elseif ps == "script'" or ps == 'script' then
sty = 1
else sty = 2
end
end
end
return head
end
local MJT = luatexja.stack_table_index.MJT
local MJS = luatexja.stack_table_index.MJS
local MJSS = luatexja.stack_table_index.MJSS
local capsule_glyph_math = ltjw.capsule_glyph_math
local is_ucs_in_japanese_char = ltjc.is_ucs_in_japanese_char_direct
conv_jchar_to_hbox_A =
function (p, sty)
if not p then return nil
else
local pid = getid(p)
if pid == id_sub_mlist then
if getfield(p, 'head') then
setfield(p, 'head', conv_jchar_to_hbox(getfield(p, 'head'), sty))
end
elseif pid == id_mchar then
local fam = has_attr(p, attr_jfam) or -1
local pc = getchar(p)
if (not is_math_letters[pc]) and is_ucs_in_japanese_char(p) and fam>=0 then
local f = ltjs.get_stack_table(MJT + 0x100 * sty + fam, -1, tex_getcount('ltj@@stack'))
if f ~= -1 then
local q = node_new(id_sub_box)
local r = node_new(id_glyph); setfield(r, 'next', nil)
setfield(r, 'char', pc); setfield(r, 'font', f); setfield(r, 'subtype', 256)
local k = has_attr(r,attr_ykblshift) or 0
set_attr(r, attr_ykblshift, 0)
-- ltj-setwidth 内で実際の位置補正はおこなうので，補正量を退避
local met = ltjf_font_metric_table[f]
r = capsule_glyph_math(r, met, met.char_type[ltjf_find_char_class(pc, met)]);
setfield(q, 'head', r); node_free(p); p=q;
set_attr(r, attr_yablshift, k)
end
end
elseif pid == id_sub_box and getfield(p, 'head') then
-- \hbox で直に与えられた内容は上下位置を補正する必要はない
local h = getfield(p, 'head')
h = ltjd_make_dir_whatsit(h, h, list_dir, 'math')
setfield(p, 'head', h)
set_attr(h, attr_icflag, PROCESSED)
end
end
return p
end
do
local function mlist_callback_ltja(n)
local n = to_direct(n); list_dir = ltjd_get_dir_count()
if getid(n)==id_whatsit and getsubtype(n)==sid_user and
getfield(n, 'user_id') == DIR then
local old_n = n; n = node_remove(n, n)
node_free(old_n); if not n then return nil end
end
return to_node(conv_jchar_to_hbox(n, 0))
end
-- LaTeX 2020-02-02 seems to have pre_mlist_to_hlist_filter callback
if luatexbase.callbacktypes['pre_mlist_to_hlist_filter'] then
luatexbase.add_to_callback('pre_mlist_to_hlist_filter',
mlist_callback_ltja, 'ltj.mlist_to_hlist_pre', 1)
else
local mlist_to_hlist = node.mlist_to_hlist
luatexbase.add_to_callback('mlist_to_hlist',
function (n, display_type, penalties)
return mlist_to_hlist(mlist_callback_ltja(n),display_type, penalties)
end,'ltj.mlist_to_hlist', 1)
end
end
luatexja.math = { is_math_letters = is_math_letters }
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