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
15 local Dnode = node.direct or node
17 local nullfunc = function(n) return n end
18 local to_node = (Dnode ~= node) and Dnode.tonode or nullfunc
19 local to_direct = (Dnode ~= node) and Dnode.todirect or nullfunc
21 local setfield = (Dnode ~= node) and Dnode.setfield or function(n, i, c) n[i] = c end
22 local getfield = (Dnode ~= node) and Dnode.getfield or function(n, i) return n[i] end
23 local getlist = (Dnode ~= node) and Dnode.getlist or function(n) return n.head end
24 local getid = (Dnode ~= node) and Dnode.getid or function(n) return n.id end
25 local getfont = (Dnode ~= node) and Dnode.getfont or function(n) return n.font end
26 local getsubtype = (Dnode ~= node) and Dnode.getsubtype or function(n) return n.subtype end
28 local node_traverse_id = Dnode.traverse_id
29 local node_new = Dnode.new
30 local node_copy = Dnode.copy
31 local node_hpack = Dnode.hpack
32 local node_next = Dnode.getnext
33 local node_free = Dnode.free
34 local node_prev = Dnode.getprev
35 local node_tail = Dnode.tail
36 local has_attr = Dnode.has_attribute
37 local set_attr = Dnode.set_attribute
38 local insert_after = Dnode.insert_after
40 local id_glyph = node.id('glyph')
41 local id_kern = node.id('kern')
42 local id_hlist = node.id('hlist')
43 local id_glue = node.id('glue')
44 local id_glue_spec = node.id('glue_spec')
45 local id_whatsit = node.id('whatsit')
46 local attr_icflag = luatexbase.attributes['ltj@icflag']
47 local attr_jchar_class = luatexbase.attributes['ltj@charclass']
48 local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
50 local ltjf_font_metric_table = ltjf.font_metric_table
51 local spec_zero_glue = ltjj.spec_zero_glue
52 local round, pairs = tex.round, pairs
54 local PACKED = luatexja.icflag_table.PACKED
55 local FROM_JFM = luatexja.icflag_table.FROM_JFM
56 local KANJI_SKIP = luatexja.icflag_table.KANJI_SKIP
57 local KANJI_SKIP_JFM = luatexja.icflag_table.KANJI_SKIP_JFM
58 local XKANJI_SKIP = luatexja.icflag_table.XKANJI_SKIP
59 local XKANJI_SKIP_JFM = luatexja.icflag_table.XKANJI_SKIP_JFM
61 local priority_table = {
73 local PROCESSED_BEGIN_FLAG = luatexja.icflag_table.PROCESSED_BEGIN_FLAG
74 get_attr_icflag = function(p)
75 return (has_attr(p, attr_icflag) or 0) % PROCESSED_BEGIN_FLAG
79 -- box 内で伸縮された glue の合計値を計算
81 local function get_stretched(q, go, gs)
82 local qs = getfield(q, 'spec')
83 if not getfield(qs, 'writable') then return 0 end
84 if gs == 1 then -- stretching
85 if getfield(qs, 'stretch_order') == go then
86 return getfield(qs, 'stretch')
89 if getfield(qs, 'shrink_order') == go then
90 return getfield(qs, 'shrink')
96 local gs_used_line = {}
97 local function get_total_stretched(p, line)
99 = getfield(p, 'glue_order'), getfield(p, 'glue_set'), getfield(p, 'glue_sign')
100 if go ~= 0 then return nil end
101 res[0], res.glue_set, res.name = 0, gf, (gs==1) and 'stretch' or 'shrink'
102 for i=1,#priority_table do res[priority_table[i]]=0 end
103 if gs ~= 1 and gs ~= 2 then return res, 0 end
105 for q in node_traverse_id(id_glue, getlist(p)) do
106 local a, ic = get_stretched(q, go, gs), get_attr_icflag(q)
107 if type(res[ic]) == 'number' then
108 -- kanjiskip, xkanjiskip は段落内で spec を共有しているが,
109 -- 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.
110 -- 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
111 -- ref_count が 0 なので Double-free が発生する.どうする?
112 -- 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.
113 if (ic == KANJI_SKIP or ic == XKANJI_SKIP) and getsubtype(q)==0 then
114 local qs = getfield(q, 'spec')
115 if qs ~= spec_zero_glue then
116 if (gs_used_line[qs] or 0)<line then
117 setfield(q, 'spec', node_copy(qs))
118 local f = node_new(id_glue); setfield(f, 'spec', qs); node_free(f)
119 -- decrese qs's reference count
121 gs_used_line[qs] = line
124 elseif ic == KANJI_SKIP_JFM then ic = KANJI_SKIP
125 elseif ic == XKANJI_SKIP_JFM then ic = XKANJI_SKIP
127 res[ic], total = res[ic] + a, total + a
129 res[0], total = res[0] + a, total + a
135 local function clear_stretch(p, ic, name)
136 for q in node_traverse_id(id_glue, getlist(p)) do
137 if get_attr_icflag(q) == ic then
138 local qs = getfield(q, 'spec')
139 if getfield(qs, 'writable') then
140 setfield(qs, name..'_order', 0)
141 setfield(qs, name, 0)
147 local set_stretch_table = {}
148 local function set_stretch(p, after, before, ic, name)
150 local ratio = after/before
151 for i,_ in pairs(set_stretch_table) do
152 set_stretch_table[i] = nil
154 for q in node_traverse_id(id_glue, getlist(p)) do
155 local f = get_attr_icflag(q)
156 if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
157 or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
158 local qs, do_flag = getfield(q, 'spec'), true
159 for i=1,#set_stretch_table do
160 if set_stretch_table[i]==qs then do_flag = false end
162 if getfield(qs, 'writable') and getfield(qs, name..'_order')==0 and do_flag then
163 setfield(qs, name, getfield(qs, name)*ratio)
164 set_stretch_table[#set_stretch_table+1] = qs
171 -- step 1: 行末に kern を挿入(句読点,中点用)
172 local function aw_step1(p, res, total)
173 local head = getlist(p)
174 local x = node_tail(head); if not x then return false end
175 x = node_prev(x); if not x then return false end
177 if getid(x) == id_glue and getsubtype(x) == 15 then
178 -- 段落最終行のときは,\penalty10000 \parfillskip が入るので,
179 -- その前の node が本来の末尾文字となる
180 x = node_prev(node_prev(x))
182 -- local xi = getid(x)
183 -- while (get_attr_icflag(x) == PACKED)
184 -- and ((xi == id_penalty) or (xi == id_kern) or (xi == id_kern)) do
185 -- x = node_prev(x); xi = getid(x)
187 local xi, xc = getid(x)
188 if xi == id_glyph and has_attr(x, attr_curjfnt) == getfont(x) then
191 elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
194 while getid(xc) == id_whatsit do xc = node_next(xc) end
196 return false-- それ以外は対象外.
198 local xk = ltjf_font_metric_table[getfont(xc)]
199 xk = xk.char_type[has_attr(xc, attr_jchar_class) or 0]
200 xk = xk['end_' .. res.name] or 0
202 if xk>0 and total>=xk then
204 local kn = node_new(id_kern)
205 setfield(kn, 'kern', (res.name=='shrink' and -1 or 1) * xk)
206 set_attr(kn, attr_icflag, FROM_JFM)
207 insert_after(head, x, kn)
213 -- step 2: 行中の glue を変える
214 local function aw_step2(p, res, total, added_flag)
215 if total == 0 then -- もともと伸縮の必要なし
216 if added_flag then -- 行末に kern 追加したので,それによる補正
217 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
218 setfield(f, 'head', nil)
219 setfield(p, 'glue_set', getfield(f, 'glue_set'))
220 setfield(p, 'glue_order', getfield(f, 'glue_order'))
221 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
225 elseif total <= res[0] then -- 和文処理グルー以外で足りる
226 for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
227 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
228 setfield(f, 'head', nil)
229 setfield(p, 'glue_set', getfield(f, 'glue_set'))
230 setfield(p, 'glue_order', getfield(f, 'glue_order'))
231 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
234 total = total - res[0]
235 for i = 1, #priority_table do
236 local v = priority_table[i]
237 if total <= res[v] then
238 for j = i+1,#priority_table do
239 clear_stretch(p, priority_table[j], res.name)
241 set_stretch(p, total, res[v], v, res.name); break
243 total = total - res[v]
245 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
246 setfield(f, 'head', nil)
247 setfield(p, 'glue_set', getfield(f, 'glue_set'))
248 setfield(p, 'glue_order', getfield(f, 'glue_order'))
249 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
255 local ltjs_fast_get_stack_skip = ltjs.fast_get_stack_skip
256 local function adjust_width(head)
257 if not head then return head end
259 for p in node_traverse_id(id_hlist, to_direct(head)) do
261 local res, total = get_total_stretched(p, line)
262 -- this is the same table as the table which is def'd in l. 92
263 if res and res.glue_set<1 then
264 total = round(total * res.glue_set)
265 aw_step2(p, res, total, aw_step1(p, res, total))
268 for i,_ in pairs(gs_used_line) do
269 gs_used_line[i] = nil
278 luatexbase.add_to_callback('post_linebreak_filter',
279 adjust_width, 'Adjust width', 100)
283 function disable_cb()
285 luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
291 luatexja.unary_pars.adjust = function(t)
292 return is_reg and 1 or 0