+--
+-- luatexja/otf.lua
+--
+luatexja.load_module('jfont'); local ltjf = luatexja.jfont
+luatexja.load_module('jfmglue'); local ltjj = luatexja.jfmglue
+luatexja.load_module('stack'); local ltjs = luatexja.stack
+luatexja.load_module('direction'); local ltjd = luatexja.direction
+
+local to_node = node.direct.tonode
+local to_direct = node.direct.todirect
+
+local setfield = node.direct.setfield
+local setglue = luatexja.setglue
+local getfield = node.direct.getfield
+local is_zero_glue = node.direct.is_zero_glue or
+ function(g)
+ return (getfield(g,'width')==0)and (getfield(g,'stretch')==0)and(getfield(g,'shrink')==0)
+ end
+local getlist = node.direct.getlist
+local getid = node.direct.getid
+local getfont = node.direct.getfont
+local getsubtype = node.direct.getsubtype
+
+local node_traverse_id = node.direct.traverse_id
+local node_new = node.direct.new
+local node_copy = node.direct.copy
+local node_hpack = node.direct.hpack
+local node_next = node.direct.getnext
+local node_free = node.direct.free
+local node_prev = node.direct.getprev
+local node_tail = node.direct.tail
+local has_attr = node.direct.has_attribute
+local set_attr = node.direct.set_attribute
+local insert_after = node.direct.insert_after
+
+local id_glyph = node.id('glyph')
+local id_kern = node.id('kern')
+local id_hlist = node.id('hlist')
+local id_glue = node.id('glue')
+local id_whatsit = node.id('whatsit')
+local attr_icflag = luatexbase.attributes['ltj@icflag']
+local attr_jchar_class = luatexbase.attributes['ltj@charclass']
+local lang_ja = luatexja.lang_ja
+
+local ltjf_font_metric_table = ltjf.font_metric_table
+local round, pairs = tex.round, pairs
+
+local PACKED = luatexja.icflag_table.PACKED
+local FROM_JFM = luatexja.icflag_table.FROM_JFM
+local KANJI_SKIP = luatexja.icflag_table.KANJI_SKIP
+local KANJI_SKIP_JFM = luatexja.icflag_table.KANJI_SKIP_JFM
+local XKANJI_SKIP = luatexja.icflag_table.XKANJI_SKIP
+local XKANJI_SKIP_JFM = luatexja.icflag_table.XKANJI_SKIP_JFM
+
+local priority_table = {
+ FROM_JFM + 2,
+ FROM_JFM + 1,
+ FROM_JFM,
+ FROM_JFM - 1,
+ FROM_JFM - 2,
+ XKANJI_SKIP,
+ KANJI_SKIP
+}
+
+local get_attr_icflag
+do
+ local PROCESSED_BEGIN_FLAG = luatexja.icflag_table.PROCESSED_BEGIN_FLAG
+ get_attr_icflag = function(p)
+ return (has_attr(p, attr_icflag) or 0) % PROCESSED_BEGIN_FLAG
+ end
+end
+
+-- box 内で伸縮された glue の合計値を計算
+
+local function get_stretched(q, go, gs)
+ if gs == 1 then -- stretching
+ if getfield(q, 'stretch_order') == go then
+ return getfield(q, 'stretch')
+ else return 0
+ end
+ else -- shrinking
+ if getfield(q, 'shrink_order') == go then
+ return getfield(q, 'shrink')
+ else return 0
+ end
+ end
+end
+
+local res = {}
+local gs_used_line = {}
+local function get_total_stretched(p, line)
+ local go, gf, gs
+ = getfield(p, 'glue_order'), getfield(p, 'glue_set'), getfield(p, 'glue_sign')
+ if go ~= 0 then return nil end
+ res[0], res.glue_set, res.name = 0, gf, (gs==1) and 'stretch' or 'shrink'
+ for i=1,#priority_table do res[priority_table[i]]=0 end
+ if gs ~= 1 and gs ~= 2 then return res, 0 end
+ local total = 0
+ for q in node_traverse_id(id_glue, getlist(p)) do
+ local a, ic = get_stretched(q, go, gs), get_attr_icflag(q)
+ if ic == KANJI_SKIP_JFM then ic = KANJI_SKIP
+ elseif ic == XKANJI_SKIP_JFM then ic = XKANJI_SKIP
+ end
+ if type(res[ic]) == 'number' then
+ -- kanjiskip, xkanjiskip は段落内で spec を共有しているが，
+ -- それはここでは望ましくないので，各 glue ごとに異なる spec を使う．
+ -- 本当は各行ごとに glue_spec を共有させたかったが，安直にやると
+ -- ref_count が 0 なので Double-free が発生する．どうする？
+ -- JFM グルーはそれぞれ異なる glue_spec を用いているので，問題ない．
+ if (ic == KANJI_SKIP or ic == XKANJI_SKIP) and getsubtype(q)==0 then
+ local qs = getfield(q, 'spec')
+ if is_zero_glue(q) then
+ if (gs_used_line[qs] or 0)<line then
+ setfield(q, 'spec', node_copy(qs))
+ local f = node_new(id_glue); setfield(f, 'spec', qs); node_free(f)
+ -- decrese qs's reference count
+ else
+ gs_used_line[qs] = line
+ end
+ end
+ end
+ res[ic], total = res[ic] + a, total + a
+ else
+ res[0], total = res[0] + a, total + a
+ end
+ end
+ return res, total
+end
+
+local function clear_stretch(p, ic, name)
+ for q in node_traverse_id(id_glue, getlist(p)) do
+ local f = get_attr_icflag(q)
+ if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
+ or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
+ local qs = getfield(q, 'spec')
+ if getfield(qs, 'writable') then
+ setfield(qs, name..'_order', 0)
+ setfield(qs, name, 0)
+ end
+ end
+ end
+end
+
+local set_stretch_table = {}
+local function set_stretch(p, after, before, ic, name)
+ if before > 0 then
+ local ratio = after/before
+ for i,_ in pairs(set_stretch_table) do
+ set_stretch_table[i] = nil
+ end
+ for q in node_traverse_id(id_glue, getlist(p)) do
+ local f = get_attr_icflag(q)
+ if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
+ or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
+ local qs, do_flag = getfield(q, 'spec'), true
+ for i=1,#set_stretch_table do
+ if set_stretch_table[i]==qs then do_flag = false end
+ end
+ if getfield(qs, 'writable') and getfield(qs, name..'_order')==0 and do_flag then
+ setfield(q, name, getfield(qs, name)*ratio)
+ set_stretch_table[#set_stretch_table+1] = qs
+ end
+ end
+ end
+ end
+end
+
+-- step 1: 行末に kern を挿入（句読点，中点用）
+local ltjd_glyph_from_packed = ltjd.glyph_from_packed
+local function aw_step1(p, res, total)
+ local head = getlist(p)
+ local x = node_tail(head); if not x then return false end
+ -- x: \rightskip
+ x = node_prev(x); if not x then return false end
+ local xi, xc = getid(x)
+ if xi == id_glue and getsubtype(x) == 15 then
+ -- 段落最終行のときは，\penalty10000 \parfillskip が入るので，
+ -- その前の node が本来の末尾文字となる
+ x = node_prev(node_prev(x)); xi = getid(x)
+ end
+ -- local xi = getid(x)
+ -- while (get_attr_icflag(x) == PACKED)
+ -- and ((xi == id_penalty) or (xi == id_kern) or (xi == id_kern)) do
+ -- x = node_prev(x); xi = getid(x)
+ -- end
+ if xi == id_glyph and getfield(x, 'lang')==lang_ja then
+ -- 和文文字
+ xc = x
+ elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
+ -- packed JAchar
+ xc = ltjd_glyph_from_packed(x)
+ while getid(xc) == id_whatsit do xc = node_next(xc) end -- これはなんのために？
+ else
+ return false-- それ以外は対象外．
+ end
+ local xk = ltjf_font_metric_table[getfont(xc)]
+ .char_type[has_attr(xc, attr_jchar_class) or 0]['end_' .. res.name] or 0
+
+ if xk>0 and total>=xk then
+ total = total - xk
+ local kn = node_new(id_kern)
+ setfield(kn, 'kern', (res.name=='shrink' and -1 or 1) * xk)
+ set_attr(kn, attr_icflag, FROM_JFM)
+ insert_after(head, x, kn)
+ return true
+ else return false
+ end
+end
+
+-- step 2: 行中の glue を変える
+local function aw_step2(p, res, total, added_flag)
+ if total == 0 then -- もともと伸縮の必要なし
+ if added_flag then -- 行末に kern 追加したので，それによる補正
+ local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
+ setfield(f, 'head', nil)
+ setfield(p, 'glue_set', getfield(f, 'glue_set'))
+ setfield(p, 'glue_order', getfield(f, 'glue_order'))
+ setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
+ node_free(f)
+ return
+ end
+ elseif total <= res[0] then -- 和文処理グルー以外で足りる
+ for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
+ local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
+ setfield(f, 'head', nil)
+ setfield(p, 'glue_set', getfield(f, 'glue_set'))
+ setfield(p, 'glue_order', getfield(f, 'glue_order'))
+ setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
+ node_free(f)
+ else
+ total = total - res[0]
+ for i = 1, #priority_table do
+ local v = priority_table[i]
+ if total <= res[v] then
+ for j = i+1,#priority_table do
+ clear_stretch(p, priority_table[j], res.name)
+ end
+ set_stretch(p, total, res[v], v, res.name); break
+ end
+ total = total - res[v]
+ end
+ local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
+ setfield(f, 'head', nil)
+ setfield(p, 'glue_set', getfield(f, 'glue_set'))
+ setfield(p, 'glue_order', getfield(f, 'glue_order'))
+ setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
+ node_free(f)
+ end
+end
+
+
+local ltjs_fast_get_stack_skip = ltjs.fast_get_stack_skip
+local function adjust_width(head)
+ if not head then return head end
+ local line = 1
+ for p in node_traverse_id(id_hlist, to_direct(head)) do
+ line = line + 1
+ local res, total = get_total_stretched(p, line)
+ -- this is the same table as the table which is def'd in l. 92
+ if res and res.glue_set<1 then
+ total = round(total * res.glue_set)
+ aw_step2(p, res, total, aw_step1(p, res, total))
+ end
+ end
+ for i,_ in pairs(gs_used_line) do
+ gs_used_line[i] = nil
+ end
+ return to_node(head)
+end
+
+do
+ luatexja.adjust = luatexja.adjust or {}
+ local is_reg = false
+ function luatexja.adjust.enable_cb()
+ if not is_reg then
+ luatexbase.add_to_callback('post_linebreak_filter',
+ adjust_width, 'Adjust width', 100)
+ is_reg = true
+ end
+ end
+ function luatexja.adjust.disable_cb()
+ if is_reg then
+ luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
+ is_reg = false
+ end
+ end
+end
+
+luatexja.unary_pars.adjust = function(t)
+ return is_reg and 1 or 0
+end
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