diff options
Diffstat (limited to 'Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua')
-rw-r--r-- | Master/texmf-dist/tex/luatex/luatexja/ltj-adjust.lua | 247 |
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 |