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authorKarl Berry <karl@freefriends.org>2012-12-10 01:31:19 +0000
committerKarl Berry <karl@freefriends.org>2012-12-10 01:31:19 +0000
commiteb3f5f9a64a4553a16273f9ff5cfe99d10f27dd8 (patch)
tree5e47c27e88cdb655ee7fefcf919ab531e8a4b757 /Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua
parent64b7e39503022a8c0ce58857cea7f25d57369757 (diff)
luatexja (9dec12)
git-svn-id: svn://tug.org/texlive/trunk@28482 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua')
-rw-r--r--Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua247
1 files changed, 247 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua b/Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua
new file mode 100644
index 00000000000..db92b2a345f
--- /dev/null
+++ b/Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua
@@ -0,0 +1,247 @@
+--
+-- luatexja/otf.lua
+--
+luatexbase.provides_module({
+ name = 'luatexja.adjust',
+ date = '2012/09/27',
+ version = '0.1',
+ description = 'Advanced line adjustment for LuaTeX-ja',
+})
+module('luatexja.adjust', package.seeall)
+
+luatexja.load_module('jfont'); local ltjf = luatexja.jfont
+luatexja.load_module('jfmglue'); local ltjj = luatexja.jfmglue
+
+local id_glyph = node.id('glyph')
+local id_kern = node.id('kern')
+local id_hlist = node.id('hlist')
+local id_glue = node.id('glue')
+local id_glue_spec = node.id('glue_spec')
+local has_attr = node.has_attribute
+local set_attr = node.set_attribute
+local attr_icflag = luatexbase.attributes['ltj@icflag']
+local attr_jchar_class = luatexbase.attributes['ltj@charclass']
+local attr_curjfnt = luatexbase.attributes['ltj@curjfnt']
+local node_copy = node.copy
+local node_next = node.next
+local node_free = node.free
+
+local ltjf_font_metric_table = ltjf.font_metric_table
+local spec_zero_glue = ltjj.spec_zero_glue
+
+local PACKED = luatexja.icflag_table.PACKED
+local FROM_JFM = luatexja.icflag_table.FROM_JFM
+local KANJI_SKIP = luatexja.icflag_table.KANJI_SKIP
+local XKANJI_SKIP = luatexja.icflag_table.XKANJI_SKIP
+
+local priority_table = {
+ FROM_JFM + 2,
+ FROM_JFM + 1,
+ FROM_JFM,
+ FROM_JFM - 1,
+ FROM_JFM - 2,
+ XKANJI_SKIP,
+ KANJI_SKIP
+}
+
+local PROCESSED_BEGIN_FLAG = 32
+local function get_attr_icflag(p)
+ return (node.has_attribute(p, attr_icflag) or 0) % PROCESSED_BEGIN_FLAG
+end
+
+-- box 内で伸縮された glue の合計値を計算
+
+local function get_stretched(q, go, gs)
+ local qs = q.spec
+ if not qs.writable then return 0 end
+ if gs == 1 then -- stretching
+ if qs.stretch_order == go then return qs.stretch end
+ else -- shrinking
+ if qs.shrink_order == go then return qs.shrink end
+ end
+end
+
+-- local new_ks, new_xs
+local function get_total_stretched(p)
+ local go, gf, gs = p.glue_order, p.glue_set, p.glue_sign
+ local res = {
+ [0] = 0,
+ glue_set = gf, name = (gs==1) and 'stretch' or 'shrink'
+ }
+ for i=1,#priority_table do res[priority_table[i]]=0 end
+ if go ~= 0 then return nil end
+ if gs ~= 1 and gs ~= 2 then return res end
+ local head = p.head
+ q = p.head
+ --luatexja.ext_show_node_list(p.head, '>>> ', print)
+ while q do
+ if q.id==id_glue then
+ local a, ic = get_stretched(q, go, gs), get_attr_icflag(q)
+ if type(res[ic]) == 'number' then
+ -- kanjiskip, xkanjiskip は段落内で spec を共有しているが,
+ -- 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.
+ -- 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.
+ res[ic] = res[ic] + a
+ if ic == KANJI_SKIP or ic == XKANJI_SKIP then
+ if q.spec ~= spec_zero_glue then
+ local ts, g;
+ q.spec, ts = node_copy(q.spec), q.spec
+ g = node.copy(q); q.spec = ts
+ node.insert_before(head, q, g);
+ head = node.remove(head, q); node.free(q); q = g
+ end
+ end
+ else
+ res[0] = res[0] + a
+ end
+ end
+ q = node_next(q)
+ end
+ return res
+end
+
+local function clear_stretch(p, ic, name)
+ --print('clear ' .. ic)
+ for q in node.traverse_id(id_glue, p.head) do
+ if get_attr_icflag(q) == ic then
+ local qs = q.spec
+ if qs.writable then
+ qs[name..'_order'], qs[name] = 0, 0
+ end
+ end
+ end
+end
+
+local set_stretch_table = {}
+local function set_stretch(p, after, before, ic, name)
+ if before > 0 then
+ --print (ic, before, after)
+ local ratio = after/before
+ for i,_ in pairs(set_stretch_table) do
+ set_stretch_table[i] = nil
+ end
+ for q in node.traverse_id(id_glue, p.head) do
+ if get_attr_icflag(q) == ic then
+ local qs, do_flag = q.spec, true
+ for i=1,#set_stretch_table do
+ if set_stretch_table[i]==qs then do_flag = false end
+ end
+ if qs.writable and qs[name..'_order'] == 0 and do_flag then
+ qs[name] = qs[name]*ratio;
+ set_stretch_table[#set_stretch_table+1] = qs
+ end
+ end
+ end
+ end
+end
+
+-- step 1: 行末に kern を挿入(句読点,中点用)
+local function aw_step1(p, res, total)
+ local x = node.tail(p.head); if not x then return false end
+ local x = node.prev(x) ; if not x then return false end
+ -- 本当の行末の node を格納
+ if x.id == id_glue and x.subtype == 15 then
+ -- 段落最終行のときは,\penalty10000 \parfillskip が入るので,
+ -- その前の node が本来の末尾文字となる
+ x = node.prev(node.prev(x))
+ end
+
+ local xi, xc = x.id
+ if xi == id_glyph and has_attr(x, attr_curjfnt) == x.font then
+ -- 和文文字
+ xc = x
+ elseif xi == id_hlist and get_attr_icflag(x) == PACKED then
+ -- packed JAchar
+ xc = x.head
+ else
+ return false-- それ以外は対象外.
+ end
+ local xk = ltjf_font_metric_table --
+ [xc.font].size_cache.char_type[has_attr(xc, attr_jchar_class) or 0]
+ ['end_' .. res.name] or 0
+ --print(res.name, total, xk, unicode.utf8.char(xc.char))
+
+ if xk>0 and total>=xk then
+ --print("ADDED")
+ total = total - xk
+ local kn = node.new(id_kern)
+ kn.kern = (res.name=='shrink' and -1 or 1) * xk
+ set_attr(kn, attr_icflag, FROM_JFM)
+ node.insert_after(p.head, x, kn)
+ return true
+ else return false
+ end
+end
+
+-- step 2: 行中の glue を変える
+local function aw_step2(p, res, total, added_flag)
+ if total == 0 then -- もともと伸縮の必要なし
+ if added_flag then -- 行末に kern 追加したので,それによる補正
+ local f = node.hpack(p.head, p.width, 'exactly')
+ f.head, p.glue_set, p.glue_sign, p.glue_order
+ = nil, f.glue_set, f.glue_sign, f.glue_order
+ node.free(f); return
+ end
+ elseif total <= res[0] then -- 和文処理グルー以外で足りる
+ for _,v in pairs(priority_table) do clear_stretch(p, v, res.name) end
+ local f = node.hpack(p.head, p.width, 'exactly')
+ f.head, p.glue_set, p.glue_sign, p.glue_order
+ = nil, f.glue_set, f.glue_sign, f.glue_order
+ node.free(f)
+ else
+ total, i = total - res[0], 1
+ while i <= #priority_table do
+ local v = priority_table[i]
+ if total <= res[v] then
+ for j = i+1,#priority_table do
+ clear_stretch(p, priority_table[j], res.name)
+ end
+ set_stretch(p, total, res[v], v, res.name)
+ i = #priority_table + 9 -- ループから抜けさせたいため
+ end
+ total, i= total - res[v], i+1
+ end
+ if i == #priority_table + 10 or added_flag then
+ local f = node.hpack(p.head, p.width, 'exactly')
+ f.head, p.glue_set, p.glue_sign, p.glue_order
+ = nil, f.glue_set, f.glue_sign, f.glue_order
+ node.free(f)
+ end
+ end
+end
+
+
+function adjust_width(head)
+ if not head then return head end
+ for p in node.traverse_id(id_hlist, head) do
+ local res = get_total_stretched(p)
+ --print(table.serialize(res))
+ if res then
+ -- 調整量の合計
+ local total = 0
+ for i,v in pairs(res) do
+ if type(i)=='number' then
+ total = total + v
+ end
+ end; total = tex.round(total * res.glue_set)
+ local added_flag = aw_step1(p, res, total)
+ --print(total, res[0], res[KANJI_SKIP], res[FROM_JFM])
+ aw_step2(p, res, total, added_flag)
+ end
+ end
+ return head
+end
+
+local is_reg = false
+function enable_cb()
+ if not is_reg then
+ luatexbase.add_to_callback('post_linebreak_filter', adjust_width, 'Adjust width', 100)
+ is_reg = true
+ end
+end
+function disable_cb()
+ if is_reg then
+ luatexbase.remove_from_callback('post_linebreak_filter', 'Adjust width')
+ is_reg = false
+ end
+end