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 lang_ja = luatexja.lang_ja
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 ic == KANJI_SKIP_JFM then ic = KANJI_SKIP
111 elseif ic == XKANJI_SKIP_JFM then ic = XKANJI_SKIP
113 if type(res[ic]) == 'number' then
114 -- kanjiskip, xkanjiskip は段落内で spec を共有しているが,
115 -- 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.
116 -- 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
117 -- ref_count が 0 なので Double-free が発生する.どうする?
118 -- 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.
119 if (ic == KANJI_SKIP or ic == XKANJI_SKIP) and getsubtype(q)==0 then
120 local qs = getfield(q, 'spec')
121 if qs ~= spec_zero_glue then
122 if (gs_used_line[qs] or 0)<line then
123 setfield(q, 'spec', node_copy(qs))
124 local f = node_new(id_glue); setfield(f, 'spec', qs); node_free(f)
125 -- decrese qs's reference count
127 gs_used_line[qs] = line
131 res[ic], total = res[ic] + a, total + a
133 res[0], total = res[0] + a, total + a
139 local function clear_stretch(p, ic, name)
140 for q in node_traverse_id(id_glue, getlist(p)) do
141 local f = get_attr_icflag(q)
142 if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
143 or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
144 local qs = getfield(q, 'spec')
145 if getfield(qs, 'writable') then
146 setfield(qs, name..'_order', 0)
147 setfield(qs, name, 0)
153 local set_stretch_table = {}
154 local function set_stretch(p, after, before, ic, name)
156 local ratio = after/before
157 for i,_ in pairs(set_stretch_table) do
158 set_stretch_table[i] = nil
160 for q in node_traverse_id(id_glue, getlist(p)) do
161 local f = get_attr_icflag(q)
162 if (f == ic) or ((ic ==KANJI_SKIP) and (f == KANJI_SKIP_JFM))
163 or ((ic ==XKANJI_SKIP) and (f == XKANJI_SKIP_JFM)) then
164 local qs, do_flag = getfield(q, 'spec'), true
165 for i=1,#set_stretch_table do
166 if set_stretch_table[i]==qs then do_flag = false end
168 if getfield(qs, 'writable') and getfield(qs, name..'_order')==0 and do_flag then
169 setfield(qs, name, getfield(qs, name)*ratio)
170 set_stretch_table[#set_stretch_table+1] = qs
177 -- step 1: 行末に kern を挿入(句読点,中点用)
178 local ltjd_glyph_from_packed = ltjd.glyph_from_packed
179 local function aw_step1(p, res, total)
180 local head = getlist(p)
181 local x = node_tail(head); if not x then return false end
183 x = node_prev(x); if not x then return false end
184 local xi, xc = getid(x)
185 if xi == id_glue and getsubtype(x) == 15 then
186 -- 段落最終行のときは,\penalty10000 \parfillskip が入るので,
187 -- その前の node が本来の末尾文字となる
188 x = node_prev(node_prev(x)); xi = getid(x)
190 -- local xi = getid(x)
191 -- while (get_attr_icflag(x) == PACKED)
192 -- and ((xi == id_penalty) or (xi == id_kern) or (xi == id_kern)) do
193 -- x = node_prev(x); xi = getid(x)
195 if xi == id_glyph and getfield(x, 'lang')==lang_ja then
198 elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
200 xc = ltjd_glyph_from_packed(x)
201 while getid(xc) == id_whatsit do xc = node_next(xc) end -- これはなんのために?
203 return false-- それ以外は対象外.
205 local xk = ltjf_font_metric_table[getfont(xc)]
206 .char_type[has_attr(xc, attr_jchar_class) or 0]['end_' .. res.name] or 0
208 if xk>0 and total>=xk then
210 local kn = node_new(id_kern)
211 setfield(kn, 'kern', (res.name=='shrink' and -1 or 1) * xk)
212 set_attr(kn, attr_icflag, FROM_JFM)
213 insert_after(head, x, kn)
219 -- step 2: 行中の glue を変える
220 local function aw_step2(p, res, total, added_flag)
221 if total == 0 then -- もともと伸縮の必要なし
222 if added_flag then -- 行末に kern 追加したので,それによる補正
223 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
224 setfield(f, 'head', nil)
225 setfield(p, 'glue_set', getfield(f, 'glue_set'))
226 setfield(p, 'glue_order', getfield(f, 'glue_order'))
227 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
231 elseif total <= res[0] then -- 和文処理グルー以外で足りる
232 for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
233 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
234 setfield(f, 'head', nil)
235 setfield(p, 'glue_set', getfield(f, 'glue_set'))
236 setfield(p, 'glue_order', getfield(f, 'glue_order'))
237 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
240 total = total - res[0]
241 for i = 1, #priority_table do
242 local v = priority_table[i]
243 if total <= res[v] then
244 for j = i+1,#priority_table do
245 clear_stretch(p, priority_table[j], res.name)
247 set_stretch(p, total, res[v], v, res.name); break
249 total = total - res[v]
251 local f = node_hpack(getlist(p), getfield(p, 'width'), 'exactly')
252 setfield(f, 'head', nil)
253 setfield(p, 'glue_set', getfield(f, 'glue_set'))
254 setfield(p, 'glue_order', getfield(f, 'glue_order'))
255 setfield(p, 'glue_sign', getfield(f, 'glue_sign'))
261 local ltjs_fast_get_stack_skip = ltjs.fast_get_stack_skip
262 local function adjust_width(head)
263 if not head then return head end
265 for p in node_traverse_id(id_hlist, to_direct(head)) do
267 local res, total = get_total_stretched(p, line)
268 -- this is the same table as the table which is def'd in l. 92
269 if res and res.glue_set<1 then
270 total = round(total * res.glue_set)
271 aw_step2(p, res, total, aw_step1(p, res, total))
274 for i,_ in pairs(gs_used_line) do
275 gs_used_line[i] = nil
284 luatexbase.add_to_callback('post_linebreak_filter',
285 adjust_width, 'Adjust width', 100)
289 function disable_cb()
291 luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
297 luatexja.unary_pars.adjust = function(t)
298 return is_reg and 1 or 0