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 ~= node) and Dnode.getnext or node.next
33 local node_free = Dnode.free
34 local node_prev = (Dnode ~= node) and Dnode.getprev or node.prev
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')
90 if getfield(qs, 'shrink_order') == go then
91 return getfield(qs, 'shrink')
98 local gs_used_line = {}
99 local function get_total_stretched(p, line)
101 = getfield(p, 'glue_order'), getfield(p, 'glue_set'), getfield(p, 'glue_sign')
102 if go ~= 0 then return nil end
103 res[0], res.glue_set, res.name = 0, gf, (gs==1) and 'stretch' or 'shrink'
104 for i=1,#priority_table do res[priority_table[i]]=0 end
105 if gs ~= 1 and gs ~= 2 then return res, 0 end
107 for q in node_traverse_id(id_glue, getlist(p)) do
108 local a, ic = get_stretched(q, go, gs), get_attr_icflag(q)
109 if type(res[ic]) == 'number' then
110 -- kanjiskip, xkanjiskip は段落内で spec を共有しているが,
111 -- 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.
112 -- 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
113 -- ref_count が 0 なので Double-free が発生する.どうする?
114 -- 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.
115 if (ic == KANJI_SKIP or ic == XKANJI_SKIP) and getsubtype(q)==0 then
116 local qs = getfield(q, 'spec')
117 if qs ~= spec_zero_glue then
118 if (gs_used_line[qs] or 0)<line then
119 setfield(q, 'spec', node_copy(qs))
120 local f = node_new(id_glue); setfield(f, 'spec', qs); node_free(f)
121 -- decrese qs's reference count
123 gs_used_line[qs] = line
126 elseif ic == KANJI_SKIP_JFM then ic = KANJI_SKIP
127 elseif ic == XKANJI_SKIP_JFM then ic = XKANJI_SKIP
129 res[ic], total = res[ic] + a, total + a
131 res[0], total = res[0] + a, total + a
137 local function clear_stretch(p, ic, name)
138 for q in node_traverse_id(id_glue, getlist(p)) do
139 if get_attr_icflag(q) == ic then
140 local qs = getfield(q, 'spec')
141 if getfield(qs, 'writable') then
142 setfield(qs, name..'_order', 0)
143 setfield(qs, name, 0)
149 local set_stretch_table = {}
150 local function set_stretch(p, after, before, ic, name)
152 local ratio = after/before
153 for i,_ in pairs(set_stretch_table) do
154 set_stretch_table[i] = nil
156 for q in node_traverse_id(id_glue, getlist(p)) do
157 local f = get_attr_icflag(q)
158 if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
159 or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
160 local qs, do_flag = getfield(q, 'spec'), true
161 for i=1,#set_stretch_table do
162 if set_stretch_table[i]==qs then do_flag = false end
164 if getfield(qs, 'writable') and getfield(qs, name..'_order')==0 and do_flag then
165 setfield(qs, name, getfield(qs, name)*ratio)
166 set_stretch_table[#set_stretch_table+1] = qs
173 -- step 1: 行末に kern を挿入(句読点,中点用)
174 local function aw_step1(p, res, total)
175 local x = node_tail(getlist(p)); if not x then return false end
177 x = node_prev(x); if not x then return false end
178 if getid(x) == id_glue and getsubtype(x) == 15 then
179 -- 段落最終行のときは,\penalty10000 \parfillskip が入るので,
180 -- その前の node が本来の末尾文字となる
181 x = node_prev(node_prev(x))
183 -- local xi = getid(x)
184 -- while (get_attr_icflag(x) == PACKED)
185 -- and ((xi == id_penalty) or (xi == id_kern) or (xi == id_kern)) do
186 -- x = node_prev(x); xi = getid(x)
188 local xi, xc = getid(x)
189 if xi == id_glyph and has_attr(x, attr_curjfnt) == getfont(x) then
192 elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
195 while getid(xc) == id_whatsit do xc = node_next(xc) end
197 return false-- それ以外は対象外.
199 local xk = ltjf_font_metric_table[getfont(xc)]
200 xk = xk.char_type[has_attr(xc, attr_jchar_class) or 0]
201 xk = xk['end_' .. res.name] or 0
203 if xk>0 and total>=xk then
205 local kn = node_new(id_kern)
206 setfield(kn, 'kern', (res.name=='shrink' and -1 or 1) * xk)
207 set_attr(kn, attr_icflag, FROM_JFM)
208 insert_after(head, x, kn)
214 -- step 2: 行中の glue を変える
215 local function aw_step2(p, res, total, added_flag)
216 if total == 0 then -- もともと伸縮の必要なし
217 if added_flag then -- 行末に kern 追加したので,それによる補正
218 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
219 setfield(f, 'head', nil)
220 setfield(p, 'glue_set', getfield(f, 'glue_set'))
221 setfield(p, 'glue_order', getfield(f, 'glue_order'))
222 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
226 elseif total <= res[0] then -- 和文処理グルー以外で足りる
227 for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
228 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
229 setfield(f, 'head', nil)
230 setfield(p, 'glue_set', getfield(f, 'glue_set'))
231 setfield(p, 'glue_order', getfield(f, 'glue_order'))
232 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
235 total = total - res[0]
236 for i = 1, #priority_table do
237 local v = priority_table[i]
238 if total <= res[v] then
239 for j = i+1,#priority_table do
240 clear_stretch(p, priority_table[j], res.name)
242 set_stretch(p, total, res[v], v, res.name); break
244 total = total - res[v]
246 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
247 setfield(f, 'head', nil)
248 setfield(p, 'glue_set', getfield(f, 'glue_set'))
249 setfield(p, 'glue_order', getfield(f, 'glue_order'))
250 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
256 local ltjs_fast_get_stack_skip = ltjs.fast_get_stack_skip
257 local function adjust_width(head)
258 if not head then return head end
260 for p in node_traverse_id(id_hlist, to_direct(head)) do
262 local res, total = get_total_stretched(p, line)
263 -- this is the same table as the table which is def'd in l. 92
264 if res and res.glue_set<1 then
265 total = round(total * res.glue_set)
266 aw_step2(p, res, total, aw_step1(p, res, total))
269 for i,_ in pairs(gs_used_line) do
270 gs_used_line[i] = nil
279 luatexbase.add_to_callback('post_linebreak_filter',
280 adjust_width, 'Adjust width', 100)
284 function disable_cb()
286 luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
292 luatexja.unary_pars.adjust = function(t)
293 return is_reg and 1 or 0