--------------------- IVS
-local font_ivs_table = {} -- key: fontnumber
-local enable_ivs
-do
- local ivs
- local sort = table.sort
- local uniq_flag
- local function add_ivs_table(tg, unitable)
- for gu, gv in pairs(tg) do
- local ga = gv.altuni
- if ga then
- for _,at in pairs(ga) do
- local bu, vsel = at.unicode, (at.variant or -1)
- if vsel~=-1 then
- if not ivs[bu] then ivs[bu] = {} end
- uniq_flag = true
- for i,_ in pairs(ivs[bu]) do
- if i==vs then uniq_flag = false; break end
- end
- if uniq_flag then
- ivs[bu][vsel] = unitable[gv.name]
- end
- end
- end
- end
- end
- end
- local function make_ivs_table(id, fname)
- ivs = {}
- local fl = fontloader.open(fname)
- local ft = fontloader.to_table(fl)
- local unicodes = id.resources.unicodes
- add_ivs_table(ft.glyphs, id.resources.unicodes)
- if ft.subfonts then
- for _,v in pairs(ft.subfonts) do
- add_ivs_table(v.glyphs, id.resources.unicodes)
- end
- end
- fontloader.close(fl)
- return ivs
- end
-
--- loading and saving
- local font_ivs_basename = {} -- key: basename
- local cache_ver = '3'
- local checksum = file.checksum
-
- local function prepare_ivs_data(n, id)
- -- test if already loaded
- if type(id)=='number' then
- font_ivs_table[n] = font_ivs_table[id]; return
- end
- local fname = id.filename
- local bname = file.basename(fname)
- if not fname then
- font_ivs_table[n] = {}; return
- elseif font_ivs_basename[bname] then
- font_ivs_table[n] = font_ivs_basename[bname]; return
- end
-
- -- if cache is present; read them
- local newsum = checksum(fname)
- local v = "ivs_" .. string.lower(file.nameonly(fname))
- local dat = ltjb.load_cache(v,
- function (t) return (t.version~=cache_ver) or (t.chksum~=newsum) end
- )
- -- if cache is not found or outdated, save the cache
- if dat then
- font_ivs_basename[bname] = dat[1] or {}
- else
- dat = make_ivs_table(id, fname)
- font_ivs_basename[bname] = dat or {}
- ltjb.save_cache( v,
- {
- chksum = checksum(fname),
- version = cache_ver,
- dat,
- })
- end
- font_ivs_table[n] = font_ivs_basename[bname]
- end
-
--- 組版時
- local function ivs_jglyph(char, bp, pf)
- local p = node_new(id_whatsit,sid_user)
- p.user_id=OTF; p.type=100; p.value=char
- set_attr(p, attr_curjfnt, pf)
- set_attr(p, attr_yablshift, has_attr(bp, attr_ykblshift) or 0)
- return p
- end
-
- local function do_ivs_repr(head)
- local p = head
- while p do
- local pid = p.id
- if pid==id_glyph then
- local pf = p.font
- if (has_attr(p, attr_curjfnt) or 0) == pf then
- -- only works with JAchars
- local pt = font_ivs_table[pf]
- local q = node_next(p) -- the next node of p
- if q and q.id==id_glyph then
- local qc = q.char
- if (qc>=0xFE00 and qc<=0xFE0F) or (qc>=0xE0100 and qc<0xE01F0) then
- -- q is a variation selector
- pt = pt and pt[p.char]; pt = pt and pt[qc]
- head = node_remove(head,q)
- if pt then
- local np = ivs_jglyph(pt, p, pf)
- head = node_insert_after(head, p, np)
- head = node_remove(head,p)
- p = np
- end
- end
- end
- end
- end
- p = node_next(p)
- end
- return head
- end
-
- -- font define
- local function font_callback(name, size, id, fallback)
- local d = fallback(name, size, id)
- prepare_ivs_data(id, d)
- return d
- end
-
- enable_ivs = function ()
- luatexbase.add_to_callback('hpack_filter',
- function (head) return do_ivs_repr(head) end,'do_ivs', 1)
- luatexbase.add_to_callback('pre_linebreak_filter',
- function (head) return do_ivs_repr(head) end, 'do_ivs', 1)
- local ivs_callback = function (name, size, id)
- return font_callback(
- name, size, id,
- function (name, size, id) return luatexja.font_callback(name, size, id) end
- )
- end
- luatexbase.add_to_callback('define_font',ivs_callback,"luatexja.ivs_font_callback", 1)
- for i=1,font.nextid()-1 do
- if identifiers[i] then prepare_ivs_data(i, identifiers[i]) end
- end
- end