4 luatexbase.provides_module({
5 name = 'luatexja.adjust',
7 description = 'Advanced line adjustment for LuaTeX-ja',
9 module('luatexja.adjust', package.seeall)
11 luatexja.load_module('jfont'); local ltjf = luatexja.jfont
12 luatexja.load_module('jfmglue'); local ltjj = luatexja.jfmglue
14 local Dnode = node.direct or node
16 local nullfunc = function(n) return n end
17 local to_node = (Dnode ~= node) and Dnode.tonode or nullfunc
18 local to_direct = (Dnode ~= node) and Dnode.todirect or nullfunc
20 local setfield = (Dnode ~= node) and Dnode.setfield or function(n, i, c) n[i] = c end
21 local getfield = (Dnode ~= node) and Dnode.getfield or function(n, i) return n[i] end
22 local getlist = (Dnode ~= node) and Dnode.getlist or function(n) return n.head end
23 local getid = (Dnode ~= node) and Dnode.getid or function(n) return n.id end
24 local getfont = (Dnode ~= node) and Dnode.getfont or function(n) return n.font end
25 local getsubtype = (Dnode ~= node) and Dnode.getsubtype or function(n) return n.subtype end
27 local node_traverse_id = Dnode.traverse_id
28 local node_new = Dnode.new
29 local node_copy = Dnode.copy
30 local node_hpack = Dnode.hpack
31 local node_next = Dnode.getnext
32 local node_free = Dnode.free
33 local node_prev = Dnode.getprev
34 local node_tail = Dnode.tail
35 local has_attr = Dnode.has_attribute
36 local set_attr = Dnode.set_attribute
37 local insert_after = Dnode.insert_after
39 local id_glyph = node.id('glyph')
40 local id_kern = node.id('kern')
41 local id_hlist = node.id('hlist')
42 local id_glue = node.id('glue')
43 local id_glue_spec = node.id('glue_spec')
44 local id_whatsit = node.id('whatsit')
45 local attr_icflag = luatexbase.attributes['ltj@icflag']
46 local attr_jchar_class = luatexbase.attributes['ltj@charclass']
47 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
49 local ltjf_font_metric_table = ltjf.font_metric_table
50 local spec_zero_glue = ltjj.spec_zero_glue
51 local round = tex.round
53 local PACKED = luatexja.icflag_table.PACKED
54 local FROM_JFM = luatexja.icflag_table.FROM_JFM
55 local KANJI_SKIP = luatexja.icflag_table.KANJI_SKIP
56 local XKANJI_SKIP = luatexja.icflag_table.XKANJI_SKIP
58 local priority_table = {
68 local PROCESSED_BEGIN_FLAG = 32
69 local function get_attr_icflag(p)
70 return (has_attr(p, attr_icflag) or 0) % PROCESSED_BEGIN_FLAG
73 -- box 内で伸縮された glue の合計値を計算
75 local function get_stretched(q, go, gs)
76 local qs = getfield(q, 'spec')
77 if not getfield(qs, 'writable') then return 0 end
78 if gs == 1 then -- stretching
79 if getfield(qs, 'stretch_order') == go then
80 return getfield(qs, 'stretch')
83 if getfield(qs, 'shrink_order') == go then
84 return getfield(qs, 'shrink')
89 -- local new_ks, new_xs
90 local function get_total_stretched(p)
92 = getfield(p, 'glue_order'), getfield(p, 'glue_set'), getfield(p, 'glue_sign')
95 glue_set = gf, name = (gs==1) and 'stretch' or 'shrink'
98 for i=1,#priority_table do res[priority_table[i]]=0 end
99 if go ~= 0 then return nil end
100 if gs ~= 1 and gs ~= 2 then return res end
101 for q in node_traverse_id(getlist(p), id_glue) do
102 local a, ic = get_stretched(q, go, gs), get_attr_icflag(q)
103 if type(res[ic]) == 'number' then
104 -- kanjiskip, xkanjiskip は段落内で spec を共有しているが,
105 -- 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.
106 -- 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.
107 res[ic] = res[ic] + a
108 if ic == KANJI_SKIP or ic == XKANJI_SKIP then
109 local qs = getfield(q, 'spec')
110 if qs ~= spec_zero_glue then
111 setfield(q, 'spec', node_copy(qs))
121 local function clear_stretch(p, ic, name)
122 --print('clear ' .. ic)
123 for q in node_traverse_id(id_glue, getlist(p)) do
124 if get_attr_icflag(q) == ic then
125 local qs = getfield(q, 'spec')
126 if getfield(qs, 'writable') then
127 setfield(qs, name..'_order', 0)
128 setfield(qs, name, 0)
134 local set_stretch_table = {}
135 local function set_stretch(p, after, before, ic, name)
137 --print (ic, before, after)
138 local ratio = after/before
139 for i,_ in pairs(set_stretch_table) do
140 set_stretch_table[i] = nil
142 for q in node_traverse_id(id_glue, getlist(p)) do
143 if get_attr_icflag(q) == ic then
144 local qs, do_flag = getfield(q, 'spec'), true
145 for i=1,#set_stretch_table do
146 if set_stretch_table[i]==qs then do_flag = false end
148 if getfield(qs, 'writable') and getfield(qs, name..'_order')==0 and do_flag then
149 setfield(qs, name, getfield(qs, name)*ratio)
150 set_stretch_table[#set_stretch_table+1] = qs
157 -- step 1: 行末に kern を挿入(句読点,中点用)
158 local function aw_step1(p, res, total)
159 local head = getlist(p)
160 local x = node_tail(head); if not x then return false end
161 x = node_prev(x) ; if not x then return false end
163 if getid(x) == id_glue and getsubtype(x) == 15 then
164 -- 段落最終行のときは,\penalty10000 \parfillskip が入るので,
165 -- その前の node が本来の末尾文字となる
166 x = node_prev(node_prev(x))
168 local xi, xc = getid(x)
169 if xi == id_glyph and has_attr(x, attr_curjfnt) == getfont(x) then
172 elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
175 while getid(xc) == id_whatsit do xc = node_next(xc) end
177 return false-- それ以外は対象外.
179 local xk = ltjf_font_metric_table[getfont(xc)]
180 xk = xk.char_type[has_attr(xc, attr_jchar_class) or 0]
181 xk = xk['end_' .. res.name] or 0
183 if xk>0 and total>=xk then
185 local kn = node_new(id_kern)
186 setfield(kn, 'kern', (res.name=='shrink' and -1 or 1) * xk)
187 set_attr(kn, attr_icflag, FROM_JFM)
188 insert_after(head, x, kn)
194 -- step 2: 行中の glue を変える
195 local function aw_step2(p, res, total, added_flag)
196 if total == 0 then -- もともと伸縮の必要なし
197 if added_flag then -- 行末に kern 追加したので,それによる補正
198 --local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
199 --setfield(f, 'head', nil)
200 setfield(p, 'glue_set', 0)
201 setfield(p, 'glue_order', 0)
202 setfield(p, 'glue_sign', 0)
206 elseif total <= res[0] then -- 和文処理グルー以外で足りる
207 for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
208 --local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
209 -- setfield(f, 'head', nil)
210 setfield(p, 'glue_set', total/res[0])
211 setfield(p, 'glue_order', 0)
212 setfield(p, 'glue_sign', res.name)
215 local orig_total, avail = total, res[0]
216 total, i = total - res[0], 1
217 while i <= #priority_table do
218 local v = priority_table[i]
219 if total <= res[v] then
220 for j = i+1,#priority_table do
221 clear_stretch(p, priority_table[j], res.name)
223 set_stretch(p, total, res[v], v, res.name)
224 avail = avail + total
225 i = #priority_table + 9 -- ループから抜けさせたいため
227 total, i, avail = total - res[v], i+1, avail + res[v]
229 if i == #priority_table + 10 or added_flag then
230 --local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
231 --setfield(f, 'head', nil)
232 setfield(p, 'glue_set', total / avail)
233 setfield(p, 'glue_order', 0)
234 setfield(p, 'glue_sign', res.name)
241 function adjust_width(head)
242 if not head then return head end
243 for p in node_traverse_id(id_hlist, to_direct(head)) do
244 local res = get_total_stretched(p)
245 --print(table.serialize(res))
249 for i,v in pairs(res) do
250 if type(i)=='number' then
253 end; total = round(total * res.glue_set)
254 local added_flag = aw_step1(p, res, total)
255 --print(total, res[0], res[KANJI_SKIP], res[FROM_JFM])
256 aw_step2(p, res, total, added_flag)
265 luatexbase.add_to_callback('post_linebreak_filter', adjust_width, 'Adjust width', 100)
269 function disable_cb()
271 luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
276 luatexja.unary_pars.adjust = function(t)
277 return is_reg and 1 or 0