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
13 luatexja.load_module('stack'); local ltjs = luatexja.stack
14 luatexja.load_module('direction'); local ltjd = luatexja.direction
16 local Dnode = node.direct or node
18 local nullfunc = function(n) return n end
19 local to_node = (Dnode ~= node) and Dnode.tonode or nullfunc
20 local to_direct = (Dnode ~= node) and Dnode.todirect or nullfunc
22 local setfield = (Dnode ~= node) and Dnode.setfield or function(n, i, c) n[i] = c end
23 local getfield = (Dnode ~= node) and Dnode.getfield or function(n, i) return n[i] end
24 local getlist = (Dnode ~= node) and Dnode.getlist or function(n) return n.head end
25 local getid = (Dnode ~= node) and Dnode.getid or function(n) return n.id end
26 local getfont = (Dnode ~= node) and Dnode.getfont or function(n) return n.font end
27 local getsubtype = (Dnode ~= node) and Dnode.getsubtype or function(n) return n.subtype end
29 local node_traverse_id = Dnode.traverse_id
30 local node_new = Dnode.new
31 local node_copy = Dnode.copy
32 local node_hpack = Dnode.hpack
33 local node_next = (Dnode ~= node) and Dnode.getnext or node.next
34 local node_free = Dnode.free
35 local node_prev = (Dnode ~= node) and Dnode.getprev or node.prev
36 local node_tail = Dnode.tail
37 local has_attr = Dnode.has_attribute
38 local set_attr = Dnode.set_attribute
39 local insert_after = Dnode.insert_after
41 local id_glyph = node.id('glyph')
42 local id_kern = node.id('kern')
43 local id_hlist = node.id('hlist')
44 local id_glue = node.id('glue')
45 local id_glue_spec = node.id('glue_spec')
46 local id_whatsit = node.id('whatsit')
47 local attr_icflag = luatexbase.attributes['ltj@icflag']
48 local attr_jchar_class = luatexbase.attributes['ltj@charclass']
49 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
51 local ltjf_font_metric_table = ltjf.font_metric_table
52 local spec_zero_glue = ltjj.spec_zero_glue
53 local round, pairs = tex.round, pairs
55 local PACKED = luatexja.icflag_table.PACKED
56 local FROM_JFM = luatexja.icflag_table.FROM_JFM
57 local KANJI_SKIP = luatexja.icflag_table.KANJI_SKIP
58 local KANJI_SKIP_JFM = luatexja.icflag_table.KANJI_SKIP_JFM
59 local XKANJI_SKIP = luatexja.icflag_table.XKANJI_SKIP
60 local XKANJI_SKIP_JFM = luatexja.icflag_table.XKANJI_SKIP_JFM
62 local priority_table = {
74 local PROCESSED_BEGIN_FLAG = luatexja.icflag_table.PROCESSED_BEGIN_FLAG
75 get_attr_icflag = function(p)
76 return (has_attr(p, attr_icflag) or 0) % PROCESSED_BEGIN_FLAG
80 -- box 内で伸縮された glue の合計値を計算
82 local function get_stretched(q, go, gs)
83 local qs = getfield(q, 'spec')
84 if not getfield(qs, 'writable') then return 0 end
85 if gs == 1 then -- stretching
86 if getfield(qs, 'stretch_order') == go then
87 return getfield(qs, 'stretch')
91 if getfield(qs, 'shrink_order') == go then
92 return getfield(qs, 'shrink')
99 local gs_used_line = {}
100 local function get_total_stretched(p, line)
102 = getfield(p, 'glue_order'), getfield(p, 'glue_set'), getfield(p, 'glue_sign')
103 if go ~= 0 then return nil end
104 res[0], res.glue_set, res.name = 0, gf, (gs==1) and 'stretch' or 'shrink'
105 for i=1,#priority_table do res[priority_table[i]]=0 end
106 if gs ~= 1 and gs ~= 2 then return res, 0 end
108 for q in node_traverse_id(id_glue, getlist(p)) do
109 local a, ic = get_stretched(q, go, gs), get_attr_icflag(q)
110 if type(res[ic]) == 'number' then
111 -- kanjiskip, xkanjiskip は段落内で spec を共有しているが,
112 -- 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.
113 -- 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
114 -- ref_count が 0 なので Double-free が発生する.どうする?
115 -- 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.
116 if (ic == KANJI_SKIP or ic == XKANJI_SKIP) and getsubtype(q)==0 then
117 local qs = getfield(q, 'spec')
118 if qs ~= spec_zero_glue then
119 if (gs_used_line[qs] or 0)<line then
120 setfield(q, 'spec', node_copy(qs))
121 local f = node_new(id_glue); setfield(f, 'spec', qs); node_free(f)
122 -- decrese qs's reference count
124 gs_used_line[qs] = line
127 elseif ic == KANJI_SKIP_JFM then ic = KANJI_SKIP
128 elseif ic == XKANJI_SKIP_JFM then ic = XKANJI_SKIP
130 res[ic], total = res[ic] + a, total + a
132 res[0], total = res[0] + a, total + a
138 local function clear_stretch(p, ic, name)
139 for q in node_traverse_id(id_glue, getlist(p)) do
140 if get_attr_icflag(q) == ic then
141 local qs = getfield(q, 'spec')
142 if getfield(qs, 'writable') then
143 setfield(qs, name..'_order', 0)
144 setfield(qs, name, 0)
150 local set_stretch_table = {}
151 local function set_stretch(p, after, before, ic, name)
153 local ratio = after/before
154 for i,_ in pairs(set_stretch_table) do
155 set_stretch_table[i] = nil
157 for q in node_traverse_id(id_glue, getlist(p)) do
158 local f = get_attr_icflag(q)
159 if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
160 or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
161 local qs, do_flag = getfield(q, 'spec'), true
162 for i=1,#set_stretch_table do
163 if set_stretch_table[i]==qs then do_flag = false end
165 if getfield(qs, 'writable') and getfield(qs, name..'_order')==0 and do_flag then
166 setfield(qs, name, getfield(qs, name)*ratio)
167 set_stretch_table[#set_stretch_table+1] = qs
174 -- step 1: 行末に kern を挿入(句読点,中点用)
175 local ltjd_glyph_from_packed = ltjd.glyph_from_packed
176 local function aw_step1(p, res, total)
177 local head = getlist(p)
178 local x = node_tail(head); if not x then return false end
180 x = node_prev(x); if not x then return false end
181 if getid(x) == id_glue and getsubtype(x) == 15 then
182 -- 段落最終行のときは,\penalty10000 \parfillskip が入るので,
183 -- その前の node が本来の末尾文字となる
184 x = node_prev(node_prev(x))
186 -- local xi = getid(x)
187 -- while (get_attr_icflag(x) == PACKED)
188 -- and ((xi == id_penalty) or (xi == id_kern) or (xi == id_kern)) do
189 -- x = node_prev(x); xi = getid(x)
191 local xi, xc = getid(x)
192 if xi == id_glyph and has_attr(x, attr_curjfnt) == getfont(x) then
195 elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
197 xc = ltjd_glyph_from_packed(x)
198 while getid(xc) == id_whatsit do xc = node_next(xc) end
200 return false-- それ以外は対象外.
202 local xk = ltjf_font_metric_table[getfont(xc)]
203 .char_type[has_attr(xc, attr_jchar_class) or 0]['end_' .. res.name] or 0
205 if xk>0 and total>=xk then
207 local kn = node_new(id_kern)
208 setfield(kn, 'kern', (res.name=='shrink' and -1 or 1) * xk)
209 set_attr(kn, attr_icflag, FROM_JFM)
210 insert_after(head, x, kn)
216 -- step 2: 行中の glue を変える
217 local function aw_step2(p, res, total, added_flag)
218 if total == 0 then -- もともと伸縮の必要なし
219 if added_flag then -- 行末に kern 追加したので,それによる補正
220 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
221 setfield(f, 'head', nil)
222 setfield(p, 'glue_set', getfield(f, 'glue_set'))
223 setfield(p, 'glue_order', getfield(f, 'glue_order'))
224 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
228 elseif total <= res[0] then -- 和文処理グルー以外で足りる
229 for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
230 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
231 setfield(f, 'head', nil)
232 setfield(p, 'glue_set', getfield(f, 'glue_set'))
233 setfield(p, 'glue_order', getfield(f, 'glue_order'))
234 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
237 total = total - res[0]
238 for i = 1, #priority_table do
239 local v = priority_table[i]
240 if total <= res[v] then
241 for j = i+1,#priority_table do
242 clear_stretch(p, priority_table[j], res.name)
244 set_stretch(p, total, res[v], v, res.name); break
246 total = total - res[v]
248 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
249 setfield(f, 'head', nil)
250 setfield(p, 'glue_set', getfield(f, 'glue_set'))
251 setfield(p, 'glue_order', getfield(f, 'glue_order'))
252 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
258 local ltjs_fast_get_stack_skip = ltjs.fast_get_stack_skip
259 local function adjust_width(head)
260 if not head then return head end
262 for p in node_traverse_id(id_hlist, to_direct(head)) do
264 local res, total = get_total_stretched(p, line)
265 -- this is the same table as the table which is def'd in l. 92
266 if res and res.glue_set<1 then
267 total = round(total * res.glue_set)
268 aw_step2(p, res, total, aw_step1(p, res, total))
271 for i,_ in pairs(gs_used_line) do
272 gs_used_line[i] = nil
281 luatexbase.add_to_callback('post_linebreak_filter',
282 adjust_width, 'Adjust width', 100)
286 function disable_cb()
288 luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
294 luatexja.unary_pars.adjust = function(t)
295 return is_reg and 1 or 0