---
-do
- local cache_ver = 3
- local checksum = file.checksum
-
- local function prepare_extra_data(n, id)
- -- test if already loaded
- if (not id) or font_extra_info[n] then return
- end
- local fname = id.filename
- local bname = file.basename(fname)
- if not fname then
- font_extra_info[n] = {}; return
- elseif font_extra_basename[bname] then
- font_extra_info[n] = font_extra_basename[bname]; return
- end
- -- if the cache is present, read it
- local newsum = checksum(fname) -- MD5 checksum of the fontfile
- local v = "extra_" .. string.lower(file.nameonly(fname))
- local dat = ltjb.load_cache(v,
- function (t) return (t.version~=cache_ver) or (t.chksum~=newsum) end
- )
- -- if the cache is not found or outdated, save the cache
- if dat then
- font_extra_basename[bname] = dat[1] or {}
- else
- local dat = nil
- dat = prepare_vert_data(dat, id)
- dat = prepare_fl_data(dat, id, fname)
- font_extra_basename[bname] = dat or {}
- ltjb.save_cache( v,
- {
- chksum = checksum(fname),
- version = cache_ver,
- dat,
- })
- end
- font_extra_info[n] = font_extra_basename[bname]
- end
- luatexbase.add_to_callback('luatexja.define_font',
- function (res, name, size, id)
- if type(res)~='number' then
- prepare_extra_data(id, res)
- supply_vkern_table(res)
- end
- end,
- 'ltj.prepare_extra_data', 1)
-
- local function a (n, dat) font_extra_info[n] = dat end
- ltjr.vert_addfunc = a