diff --git a/src/lib/ucd.lua b/src/lib/ucd.lua
new file mode 100644
index 0000000000..71b94671f4
--- /dev/null
+++ b/src/lib/ucd.lua
@@ -0,0 +1,514 @@
+-- Use of this source code is governed by the Apache 2.0 license; see COPYING.
+
+module(..., package.seeall)
+
+local lib = require("core.lib")
+local maxpc = require("lib.maxpc")
+local codepoint = maxpc.codepoint
+local match, capture, combine = maxpc.import()
+
+function load_ucd (txt)
+   local parser = capture.unpack(
+      capture.seq(
+         match.equal("\n"),
+         capture.natural_number(16),
+         combine.maybe(
+            capture.unpack(
+               capture.seq(
+                  match.equal("."), match.equal("."),
+                  capture.natural_number(16)
+               ),
+               function (_, _, stop) return stop end
+            )
+         ),
+         combine.any(match.equal(" ")),
+         match.equal(";"),
+         combine.any(match.equal(" ")),
+         capture.subseq(
+            combine.some(
+               match._not(
+                  match.seq(combine.any(match.equal(" ")),
+                            combine._or(match.equal("#"),
+                                        match.equal("\n")))
+               )
+            )
+         )
+      ),
+      function (_, start, stop, _, _, _, value)
+         return {start=start, stop=stop, value=value}
+      end
+   )
+   return maxpc.parse(
+      lib.readfile(txt, "*a"),
+      combine.any(
+         capture.unpack(
+            capture.seq(combine.any(match._not(parser)), parser),
+            function (_, mapping) return mapping end
+         )
+      )
+   )
+end
+
+function block_name (name)
+   return name:gsub("[ _-]", ""):lower()
+end
+
+function compile_block_predicates (ucd_path)
+   print("block = {}")
+   for _, block in ipairs(load_ucd(ucd_path.."/Blocks.txt")) do
+      if not block.stop then
+         print(("function block.%s (c) return c == %d end")
+               :format(block_name(block.value), block.start))
+      else
+         print(("function block.%s (c) return %d <= c and c <= %d end")
+               :format(block_name(block.value), block.start, block.stop))
+      end
+   end
+end
+
+local function restrict_to_ascii (entries)
+   local for_ascii = {}
+   for _, entry in ipairs(entries) do
+      if entry.start <= 127 and (entry.stop or 0) <= 127 then
+         table.insert(for_ascii, entry)
+      end
+   end
+   return for_ascii
+end
+
+function compile_category_predicates (ucd_path)
+   print("category = {}")
+   local categories = {}
+   local entries = load_ucd(ucd_path.."/extracted/DerivedGeneralCategory.txt")
+   local ascii_entries = restrict_to_ascii(entries)
+   for _, entry in ipairs(entries) do
+      if not categories[entry.value] then categories[entry.value] = {} end
+   end
+   -- Compile predicates for ASCII only
+   for _, entry in ipairs(ascii_entries) do
+      table.insert(categories[entry.value], entry)
+   end
+   for cat, entries in pairs(categories) do
+      print(("function category.%s (c)"):format(cat))
+      for _, entry in ipairs(entries) do
+         if not entry.stop then
+            print(("   if c == %d then return true end")
+                  :format(entry.start))
+         else
+            print(("   if %d <= c and c <= %d then return true end"):format(
+                  entry.start, entry.stop))
+         end
+      end
+      print("   return false end")
+   end
+   -- Compile super categories
+   local super_categories = {}
+   for cat, _ in pairs(categories) do
+      local super = cat:sub(1,1)
+      if not super_categories[super] then super_categories[super] = {} end
+      table.insert(super_categories[super], "category."..cat)
+   end
+   for super, cats in pairs(super_categories) do
+      print(("function category.%s (c)"):format(super))
+      print(("   return %s(c) end"):format(table.concat(cats, "(c) or ")))
+   end
+end
+
+function selftest ()
+   local ucd_path = os.getenv("SNABB_UCD_PATH")
+   if not ucd_path then main.exit(engine.test_skipped_code) end
+
+   compile_block_predicates(ucd_path)
+   print()
+   compile_category_predicates(ucd_path)
+end
+
+
+-- Code below here is automatically generated (for Unicode 10.0.0) by the
+-- functions above.
+
+block = {}
+function block.basiclatin (c) return 0 <= c and c <= 127 end
+function block.latin1supplement (c) return 128 <= c and c <= 255 end
+function block.latinextendeda (c) return 256 <= c and c <= 383 end
+function block.latinextendedb (c) return 384 <= c and c <= 591 end
+function block.ipaextensions (c) return 592 <= c and c <= 687 end
+function block.spacingmodifierletters (c) return 688 <= c and c <= 767 end
+function block.combiningdiacriticalmarks (c) return 768 <= c and c <= 879 end
+function block.greekandcoptic (c) return 880 <= c and c <= 1023 end
+function block.cyrillic (c) return 1024 <= c and c <= 1279 end
+function block.cyrillicsupplement (c) return 1280 <= c and c <= 1327 end
+function block.armenian (c) return 1328 <= c and c <= 1423 end
+function block.hebrew (c) return 1424 <= c and c <= 1535 end
+function block.arabic (c) return 1536 <= c and c <= 1791 end
+function block.syriac (c) return 1792 <= c and c <= 1871 end
+function block.arabicsupplement (c) return 1872 <= c and c <= 1919 end
+function block.thaana (c) return 1920 <= c and c <= 1983 end
+function block.nko (c) return 1984 <= c and c <= 2047 end
+function block.samaritan (c) return 2048 <= c and c <= 2111 end
+function block.mandaic (c) return 2112 <= c and c <= 2143 end
+function block.syriacsupplement (c) return 2144 <= c and c <= 2159 end
+function block.arabicextendeda (c) return 2208 <= c and c <= 2303 end
+function block.devanagari (c) return 2304 <= c and c <= 2431 end
+function block.bengali (c) return 2432 <= c and c <= 2559 end
+function block.gurmukhi (c) return 2560 <= c and c <= 2687 end
+function block.gujarati (c) return 2688 <= c and c <= 2815 end
+function block.oriya (c) return 2816 <= c and c <= 2943 end
+function block.tamil (c) return 2944 <= c and c <= 3071 end
+function block.telugu (c) return 3072 <= c and c <= 3199 end
+function block.kannada (c) return 3200 <= c and c <= 3327 end
+function block.malayalam (c) return 3328 <= c and c <= 3455 end
+function block.sinhala (c) return 3456 <= c and c <= 3583 end
+function block.thai (c) return 3584 <= c and c <= 3711 end
+function block.lao (c) return 3712 <= c and c <= 3839 end
+function block.tibetan (c) return 3840 <= c and c <= 4095 end
+function block.myanmar (c) return 4096 <= c and c <= 4255 end
+function block.georgian (c) return 4256 <= c and c <= 4351 end
+function block.hanguljamo (c) return 4352 <= c and c <= 4607 end
+function block.ethiopic (c) return 4608 <= c and c <= 4991 end
+function block.ethiopicsupplement (c) return 4992 <= c and c <= 5023 end
+function block.cherokee (c) return 5024 <= c and c <= 5119 end
+function block.unifiedcanadianaboriginalsyllabics (c) return 5120 <= c and c <= 5759 end
+function block.ogham (c) return 5760 <= c and c <= 5791 end
+function block.runic (c) return 5792 <= c and c <= 5887 end
+function block.tagalog (c) return 5888 <= c and c <= 5919 end
+function block.hanunoo (c) return 5920 <= c and c <= 5951 end
+function block.buhid (c) return 5952 <= c and c <= 5983 end
+function block.tagbanwa (c) return 5984 <= c and c <= 6015 end
+function block.khmer (c) return 6016 <= c and c <= 6143 end
+function block.mongolian (c) return 6144 <= c and c <= 6319 end
+function block.unifiedcanadianaboriginalsyllabicsextended (c) return 6320 <= c and c <= 6399 end
+function block.limbu (c) return 6400 <= c and c <= 6479 end
+function block.taile (c) return 6480 <= c and c <= 6527 end
+function block.newtailue (c) return 6528 <= c and c <= 6623 end
+function block.khmersymbols (c) return 6624 <= c and c <= 6655 end
+function block.buginese (c) return 6656 <= c and c <= 6687 end
+function block.taitham (c) return 6688 <= c and c <= 6831 end
+function block.combiningdiacriticalmarksextended (c) return 6832 <= c and c <= 6911 end
+function block.balinese (c) return 6912 <= c and c <= 7039 end
+function block.sundanese (c) return 7040 <= c and c <= 7103 end
+function block.batak (c) return 7104 <= c and c <= 7167 end
+function block.lepcha (c) return 7168 <= c and c <= 7247 end
+function block.olchiki (c) return 7248 <= c and c <= 7295 end
+function block.cyrillicextendedc (c) return 7296 <= c and c <= 7311 end
+function block.sundanesesupplement (c) return 7360 <= c and c <= 7375 end
+function block.vedicextensions (c) return 7376 <= c and c <= 7423 end
+function block.phoneticextensions (c) return 7424 <= c and c <= 7551 end
+function block.phoneticextensionssupplement (c) return 7552 <= c and c <= 7615 end
+function block.combiningdiacriticalmarkssupplement (c) return 7616 <= c and c <= 7679 end
+function block.latinextendedadditional (c) return 7680 <= c and c <= 7935 end
+function block.greekextended (c) return 7936 <= c and c <= 8191 end
+function block.generalpunctuation (c) return 8192 <= c and c <= 8303 end
+function block.superscriptsandsubscripts (c) return 8304 <= c and c <= 8351 end
+function block.currencysymbols (c) return 8352 <= c and c <= 8399 end
+function block.combiningdiacriticalmarksforsymbols (c) return 8400 <= c and c <= 8447 end
+function block.letterlikesymbols (c) return 8448 <= c and c <= 8527 end
+function block.numberforms (c) return 8528 <= c and c <= 8591 end
+function block.arrows (c) return 8592 <= c and c <= 8703 end
+function block.mathematicaloperators (c) return 8704 <= c and c <= 8959 end
+function block.miscellaneoustechnical (c) return 8960 <= c and c <= 9215 end
+function block.controlpictures (c) return 9216 <= c and c <= 9279 end
+function block.opticalcharacterrecognition (c) return 9280 <= c and c <= 9311 end
+function block.enclosedalphanumerics (c) return 9312 <= c and c <= 9471 end
+function block.boxdrawing (c) return 9472 <= c and c <= 9599 end
+function block.blockelements (c) return 9600 <= c and c <= 9631 end
+function block.geometricshapes (c) return 9632 <= c and c <= 9727 end
+function block.miscellaneoussymbols (c) return 9728 <= c and c <= 9983 end
+function block.dingbats (c) return 9984 <= c and c <= 10175 end
+function block.miscellaneousmathematicalsymbolsa (c) return 10176 <= c and c <= 10223 end
+function block.supplementalarrowsa (c) return 10224 <= c and c <= 10239 end
+function block.braillepatterns (c) return 10240 <= c and c <= 10495 end
+function block.supplementalarrowsb (c) return 10496 <= c and c <= 10623 end
+function block.miscellaneousmathematicalsymbolsb (c) return 10624 <= c and c <= 10751 end
+function block.supplementalmathematicaloperators (c) return 10752 <= c and c <= 11007 end
+function block.miscellaneoussymbolsandarrows (c) return 11008 <= c and c <= 11263 end
+function block.glagolitic (c) return 11264 <= c and c <= 11359 end
+function block.latinextendedc (c) return 11360 <= c and c <= 11391 end
+function block.coptic (c) return 11392 <= c and c <= 11519 end
+function block.georgiansupplement (c) return 11520 <= c and c <= 11567 end
+function block.tifinagh (c) return 11568 <= c and c <= 11647 end
+function block.ethiopicextended (c) return 11648 <= c and c <= 11743 end
+function block.cyrillicextendeda (c) return 11744 <= c and c <= 11775 end
+function block.supplementalpunctuation (c) return 11776 <= c and c <= 11903 end
+function block.cjkradicalssupplement (c) return 11904 <= c and c <= 12031 end
+function block.kangxiradicals (c) return 12032 <= c and c <= 12255 end
+function block.ideographicdescriptioncharacters (c) return 12272 <= c and c <= 12287 end
+function block.cjksymbolsandpunctuation (c) return 12288 <= c and c <= 12351 end
+function block.hiragana (c) return 12352 <= c and c <= 12447 end
+function block.katakana (c) return 12448 <= c and c <= 12543 end
+function block.bopomofo (c) return 12544 <= c and c <= 12591 end
+function block.hangulcompatibilityjamo (c) return 12592 <= c and c <= 12687 end
+function block.kanbun (c) return 12688 <= c and c <= 12703 end
+function block.bopomofoextended (c) return 12704 <= c and c <= 12735 end
+function block.cjkstrokes (c) return 12736 <= c and c <= 12783 end
+function block.katakanaphoneticextensions (c) return 12784 <= c and c <= 12799 end
+function block.enclosedcjklettersandmonths (c) return 12800 <= c and c <= 13055 end
+function block.cjkcompatibility (c) return 13056 <= c and c <= 13311 end
+function block.cjkunifiedideographsextensiona (c) return 13312 <= c and c <= 19903 end
+function block.yijinghexagramsymbols (c) return 19904 <= c and c <= 19967 end
+function block.cjkunifiedideographs (c) return 19968 <= c and c <= 40959 end
+function block.yisyllables (c) return 40960 <= c and c <= 42127 end
+function block.yiradicals (c) return 42128 <= c and c <= 42191 end
+function block.lisu (c) return 42192 <= c and c <= 42239 end
+function block.vai (c) return 42240 <= c and c <= 42559 end
+function block.cyrillicextendedb (c) return 42560 <= c and c <= 42655 end
+function block.bamum (c) return 42656 <= c and c <= 42751 end
+function block.modifiertoneletters (c) return 42752 <= c and c <= 42783 end
+function block.latinextendedd (c) return 42784 <= c and c <= 43007 end
+function block.sylotinagri (c) return 43008 <= c and c <= 43055 end
+function block.commonindicnumberforms (c) return 43056 <= c and c <= 43071 end
+function block.phagspa (c) return 43072 <= c and c <= 43135 end
+function block.saurashtra (c) return 43136 <= c and c <= 43231 end
+function block.devanagariextended (c) return 43232 <= c and c <= 43263 end
+function block.kayahli (c) return 43264 <= c and c <= 43311 end
+function block.rejang (c) return 43312 <= c and c <= 43359 end
+function block.hanguljamoextendeda (c) return 43360 <= c and c <= 43391 end
+function block.javanese (c) return 43392 <= c and c <= 43487 end
+function block.myanmarextendedb (c) return 43488 <= c and c <= 43519 end
+function block.cham (c) return 43520 <= c and c <= 43615 end
+function block.myanmarextendeda (c) return 43616 <= c and c <= 43647 end
+function block.taiviet (c) return 43648 <= c and c <= 43743 end
+function block.meeteimayekextensions (c) return 43744 <= c and c <= 43775 end
+function block.ethiopicextendeda (c) return 43776 <= c and c <= 43823 end
+function block.latinextendede (c) return 43824 <= c and c <= 43887 end
+function block.cherokeesupplement (c) return 43888 <= c and c <= 43967 end
+function block.meeteimayek (c) return 43968 <= c and c <= 44031 end
+function block.hangulsyllables (c) return 44032 <= c and c <= 55215 end
+function block.hanguljamoextendedb (c) return 55216 <= c and c <= 55295 end
+function block.highsurrogates (c) return 55296 <= c and c <= 56191 end
+function block.highprivateusesurrogates (c) return 56192 <= c and c <= 56319 end
+function block.lowsurrogates (c) return 56320 <= c and c <= 57343 end
+function block.privateusearea (c) return 57344 <= c and c <= 63743 end
+function block.cjkcompatibilityideographs (c) return 63744 <= c and c <= 64255 end
+function block.alphabeticpresentationforms (c) return 64256 <= c and c <= 64335 end
+function block.arabicpresentationformsa (c) return 64336 <= c and c <= 65023 end
+function block.variationselectors (c) return 65024 <= c and c <= 65039 end
+function block.verticalforms (c) return 65040 <= c and c <= 65055 end
+function block.combininghalfmarks (c) return 65056 <= c and c <= 65071 end
+function block.cjkcompatibilityforms (c) return 65072 <= c and c <= 65103 end
+function block.smallformvariants (c) return 65104 <= c and c <= 65135 end
+function block.arabicpresentationformsb (c) return 65136 <= c and c <= 65279 end
+function block.halfwidthandfullwidthforms (c) return 65280 <= c and c <= 65519 end
+function block.specials (c) return 65520 <= c and c <= 65535 end
+function block.linearbsyllabary (c) return 65536 <= c and c <= 65663 end
+function block.linearbideograms (c) return 65664 <= c and c <= 65791 end
+function block.aegeannumbers (c) return 65792 <= c and c <= 65855 end
+function block.ancientgreeknumbers (c) return 65856 <= c and c <= 65935 end
+function block.ancientsymbols (c) return 65936 <= c and c <= 65999 end
+function block.phaistosdisc (c) return 66000 <= c and c <= 66047 end
+function block.lycian (c) return 66176 <= c and c <= 66207 end
+function block.carian (c) return 66208 <= c and c <= 66271 end
+function block.copticepactnumbers (c) return 66272 <= c and c <= 66303 end
+function block.olditalic (c) return 66304 <= c and c <= 66351 end
+function block.gothic (c) return 66352 <= c and c <= 66383 end
+function block.oldpermic (c) return 66384 <= c and c <= 66431 end
+function block.ugaritic (c) return 66432 <= c and c <= 66463 end
+function block.oldpersian (c) return 66464 <= c and c <= 66527 end
+function block.deseret (c) return 66560 <= c and c <= 66639 end
+function block.shavian (c) return 66640 <= c and c <= 66687 end
+function block.osmanya (c) return 66688 <= c and c <= 66735 end
+function block.osage (c) return 66736 <= c and c <= 66815 end
+function block.elbasan (c) return 66816 <= c and c <= 66863 end
+function block.caucasianalbanian (c) return 66864 <= c and c <= 66927 end
+function block.lineara (c) return 67072 <= c and c <= 67455 end
+function block.cypriotsyllabary (c) return 67584 <= c and c <= 67647 end
+function block.imperialaramaic (c) return 67648 <= c and c <= 67679 end
+function block.palmyrene (c) return 67680 <= c and c <= 67711 end
+function block.nabataean (c) return 67712 <= c and c <= 67759 end
+function block.hatran (c) return 67808 <= c and c <= 67839 end
+function block.phoenician (c) return 67840 <= c and c <= 67871 end
+function block.lydian (c) return 67872 <= c and c <= 67903 end
+function block.meroitichieroglyphs (c) return 67968 <= c and c <= 67999 end
+function block.meroiticcursive (c) return 68000 <= c and c <= 68095 end
+function block.kharoshthi (c) return 68096 <= c and c <= 68191 end
+function block.oldsoutharabian (c) return 68192 <= c and c <= 68223 end
+function block.oldnortharabian (c) return 68224 <= c and c <= 68255 end
+function block.manichaean (c) return 68288 <= c and c <= 68351 end
+function block.avestan (c) return 68352 <= c and c <= 68415 end
+function block.inscriptionalparthian (c) return 68416 <= c and c <= 68447 end
+function block.inscriptionalpahlavi (c) return 68448 <= c and c <= 68479 end
+function block.psalterpahlavi (c) return 68480 <= c and c <= 68527 end
+function block.oldturkic (c) return 68608 <= c and c <= 68687 end
+function block.oldhungarian (c) return 68736 <= c and c <= 68863 end
+function block.ruminumeralsymbols (c) return 69216 <= c and c <= 69247 end
+function block.brahmi (c) return 69632 <= c and c <= 69759 end
+function block.kaithi (c) return 69760 <= c and c <= 69839 end
+function block.sorasompeng (c) return 69840 <= c and c <= 69887 end
+function block.chakma (c) return 69888 <= c and c <= 69967 end
+function block.mahajani (c) return 69968 <= c and c <= 70015 end
+function block.sharada (c) return 70016 <= c and c <= 70111 end
+function block.sinhalaarchaicnumbers (c) return 70112 <= c and c <= 70143 end
+function block.khojki (c) return 70144 <= c and c <= 70223 end
+function block.multani (c) return 70272 <= c and c <= 70319 end
+function block.khudawadi (c) return 70320 <= c and c <= 70399 end
+function block.grantha (c) return 70400 <= c and c <= 70527 end
+function block.newa (c) return 70656 <= c and c <= 70783 end
+function block.tirhuta (c) return 70784 <= c and c <= 70879 end
+function block.siddham (c) return 71040 <= c and c <= 71167 end
+function block.modi (c) return 71168 <= c and c <= 71263 end
+function block.mongoliansupplement (c) return 71264 <= c and c <= 71295 end
+function block.takri (c) return 71296 <= c and c <= 71375 end
+function block.ahom (c) return 71424 <= c and c <= 71487 end
+function block.warangciti (c) return 71840 <= c and c <= 71935 end
+function block.zanabazarsquare (c) return 72192 <= c and c <= 72271 end
+function block.soyombo (c) return 72272 <= c and c <= 72367 end
+function block.paucinhau (c) return 72384 <= c and c <= 72447 end
+function block.bhaiksuki (c) return 72704 <= c and c <= 72815 end
+function block.marchen (c) return 72816 <= c and c <= 72895 end
+function block.masaramgondi (c) return 72960 <= c and c <= 73055 end
+function block.cuneiform (c) return 73728 <= c and c <= 74751 end
+function block.cuneiformnumbersandpunctuation (c) return 74752 <= c and c <= 74879 end
+function block.earlydynasticcuneiform (c) return 74880 <= c and c <= 75087 end
+function block.egyptianhieroglyphs (c) return 77824 <= c and c <= 78895 end
+function block.anatolianhieroglyphs (c) return 82944 <= c and c <= 83583 end
+function block.bamumsupplement (c) return 92160 <= c and c <= 92735 end
+function block.mro (c) return 92736 <= c and c <= 92783 end
+function block.bassavah (c) return 92880 <= c and c <= 92927 end
+function block.pahawhhmong (c) return 92928 <= c and c <= 93071 end
+function block.miao (c) return 93952 <= c and c <= 94111 end
+function block.ideographicsymbolsandpunctuation (c) return 94176 <= c and c <= 94207 end
+function block.tangut (c) return 94208 <= c and c <= 100351 end
+function block.tangutcomponents (c) return 100352 <= c and c <= 101119 end
+function block.kanasupplement (c) return 110592 <= c and c <= 110847 end
+function block.kanaextendeda (c) return 110848 <= c and c <= 110895 end
+function block.nushu (c) return 110960 <= c and c <= 111359 end
+function block.duployan (c) return 113664 <= c and c <= 113823 end
+function block.shorthandformatcontrols (c) return 113824 <= c and c <= 113839 end
+function block.byzantinemusicalsymbols (c) return 118784 <= c and c <= 119039 end
+function block.musicalsymbols (c) return 119040 <= c and c <= 119295 end
+function block.ancientgreekmusicalnotation (c) return 119296 <= c and c <= 119375 end
+function block.taixuanjingsymbols (c) return 119552 <= c and c <= 119647 end
+function block.countingrodnumerals (c) return 119648 <= c and c <= 119679 end
+function block.mathematicalalphanumericsymbols (c) return 119808 <= c and c <= 120831 end
+function block.suttonsignwriting (c) return 120832 <= c and c <= 121519 end
+function block.glagoliticsupplement (c) return 122880 <= c and c <= 122927 end
+function block.mendekikakui (c) return 124928 <= c and c <= 125151 end
+function block.adlam (c) return 125184 <= c and c <= 125279 end
+function block.arabicmathematicalalphabeticsymbols (c) return 126464 <= c and c <= 126719 end
+function block.mahjongtiles (c) return 126976 <= c and c <= 127023 end
+function block.dominotiles (c) return 127024 <= c and c <= 127135 end
+function block.playingcards (c) return 127136 <= c and c <= 127231 end
+function block.enclosedalphanumericsupplement (c) return 127232 <= c and c <= 127487 end
+function block.enclosedideographicsupplement (c) return 127488 <= c and c <= 127743 end
+function block.miscellaneoussymbolsandpictographs (c) return 127744 <= c and c <= 128511 end
+function block.emoticons (c) return 128512 <= c and c <= 128591 end
+function block.ornamentaldingbats (c) return 128592 <= c and c <= 128639 end
+function block.transportandmapsymbols (c) return 128640 <= c and c <= 128767 end
+function block.alchemicalsymbols (c) return 128768 <= c and c <= 128895 end
+function block.geometricshapesextended (c) return 128896 <= c and c <= 129023 end
+function block.supplementalarrowsc (c) return 129024 <= c and c <= 129279 end
+function block.supplementalsymbolsandpictographs (c) return 129280 <= c and c <= 129535 end
+function block.cjkunifiedideographsextensionb (c) return 131072 <= c and c <= 173791 end
+function block.cjkunifiedideographsextensionc (c) return 173824 <= c and c <= 177983 end
+function block.cjkunifiedideographsextensiond (c) return 177984 <= c and c <= 178207 end
+function block.cjkunifiedideographsextensione (c) return 178208 <= c and c <= 183983 end
+function block.cjkunifiedideographsextensionf (c) return 183984 <= c and c <= 191471 end
+function block.cjkcompatibilityideographssupplement (c) return 194560 <= c and c <= 195103 end
+function block.tags (c) return 917504 <= c and c <= 917631 end
+function block.variationselectorssupplement (c) return 917760 <= c and c <= 917999 end
+function block.supplementaryprivateuseareaa (c) return 983040 <= c and c <= 1048575 end
+function block.supplementaryprivateuseareab (c) return 1048576 <= c and c <= 1114111 end
+
+category = {}
+function category.Lm (c)
+   return false end
+function category.Zs (c)
+   if c == 32 then return true end
+   return false end
+function category.Nd (c)
+   if 48 <= c and c <= 57 then return true end
+   return false end
+function category.Co (c)
+   return false end
+function category.Mc (c)
+   return false end
+function category.Pc (c)
+   if c == 95 then return true end
+   return false end
+function category.No (c)
+   return false end
+function category.Pi (c)
+   return false end
+function category.Lo (c)
+   return false end
+function category.So (c)
+   return false end
+function category.Cs (c)
+   return false end
+function category.Sk (c)
+   if c == 94 then return true end
+   if c == 96 then return true end
+   return false end
+function category.Pd (c)
+   if c == 45 then return true end
+   return false end
+function category.Sc (c)
+   if c == 36 then return true end
+   return false end
+function category.Mn (c)
+   return false end
+function category.Po (c)
+   if 33 <= c and c <= 35 then return true end
+   if 37 <= c and c <= 39 then return true end
+   if c == 42 then return true end
+   if c == 44 then return true end
+   if 46 <= c and c <= 47 then return true end
+   if 58 <= c and c <= 59 then return true end
+   if 63 <= c and c <= 64 then return true end
+   if c == 92 then return true end
+   return false end
+function category.Cn (c)
+   return false end
+function category.Pe (c)
+   if c == 41 then return true end
+   if c == 93 then return true end
+   if c == 125 then return true end
+   return false end
+function category.Cf (c)
+   return false end
+function category.Me (c)
+   return false end
+function category.Lt (c)
+   return false end
+function category.Zp (c)
+   return false end
+function category.Cc (c)
+   if 0 <= c and c <= 31 then return true end
+   return false end
+function category.Pf (c)
+   return false end
+function category.Lu (c)
+   if 65 <= c and c <= 90 then return true end
+   return false end
+function category.Ps (c)
+   if c == 40 then return true end
+   if c == 91 then return true end
+   if c == 123 then return true end
+   return false end
+function category.Ll (c)
+   if 97 <= c and c <= 122 then return true end
+   return false end
+function category.Sm (c)
+   if c == 43 then return true end
+   if 60 <= c and c <= 62 then return true end
+   if c == 124 then return true end
+   if c == 126 then return true end
+   return false end
+function category.Nl (c)
+   return false end
+function category.Zl (c)
+   return false end
+function category.M (c)
+   return category.Mc(c) or category.Mn(c) or category.Me(c) end
+function category.S (c)
+   return category.So(c) or category.Sk(c) or category.Sc(c) or category.Sm(c) end
+function category.N (c)
+   return category.Nd(c) or category.No(c) or category.Nl(c) end
+function category.Z (c)
+   return category.Zs(c) or category.Zp(c) or category.Zl(c) end
+function category.L (c)
+   return category.Lm(c) or category.Lo(c) or category.Lt(c) or category.Lu(c) or category.Ll(c) end
+function category.C (c)
+   return category.Co(c) or category.Cs(c) or category.Cn(c) or category.Cf(c) or category.Cc(c) end
+function category.P (c)
+   return category.Pc(c) or category.Pi(c) or category.Pd(c) or category.Po(c) or category.Pe(c) or category.Pf(c) or category.Ps(c) end