AntiZalgo

antizalgo.user.js

// ==UserScript==
// @name         Anti-Zalgo (Complex) NRGsoft
// @namespace    https://github.com/Goodlookinguy/pwvnrg/raw/master/anti-zalgo/antizalgo-complex.js
// @version      1.0b
// @description  Strip certain ranges of text that can be used to create Zalgo text from forums
// @author       NRGLG
// @run-at       document-end
// @include http://*/*
// @include https://*/*
// @grant        none
// ==/UserScript==

(function()
{
  // more specific filters
  // following the Unicode categorization
  // this list is incomplete at the moment
  var blockedRanges = [
      ////////////////////////////////////////////////
      // European Scripts
      [0xFB1E, 0xFB1E], // Alphabetic Presentation Forms
      
      [0x0483, 0x0489],  // Cyrillic
      
      [0x2DE0, 0x2DFF], // Cyrillic Extended-A
      
      [0xA66F, 0xA672], // Cyrillic Extended-B
      [0xA674, 0xA67D], // Cyrillic Extended-B
      [0xA69E, 0xA69F], // Cyrillic Extended-B
      
      [0x10376, 0x1037A], // Old Permic
      
      [0x101FD, 0x101FD], // Phaistos Disc
      
      ////////////////////////////////////////////////
      // Combining Marks
      [0x0300, 0x036F], // Combining Diacritical Marks
      [0x1AB0, 0x1ABE], // Combining Diacritical Marks Extended
      [0x1DC0, 0x1DFF], // Combining Diacritical Marks Supplement
      [0x20D0, 0x20F0], // Combining Diacritical Marks for Symbols
      [0xFE20, 0xFE2F], // Combining Half Marks
      
      ////////////////////////////////////////////////
      // African Scripts
      [0xA6F0, 0xA6F1], // Bamum
      
      [0x16AF0, 0x16AF4], // Bassa Vah
      
      [0x2CEF, 0x2CF1], // Coptic
      
      [0x102E0, 0x102E0], // Coptic Epact Numbers
      
      [0x1E8D0, 0x1E8D6], // Mende Kikakui
      
      [0x07EB, 0x07F3], // N'Ko
      
      [0x2D7F, 0x2D7F], // Tifinagh
      
      ////////////////////////////////////////////////
      // Middle Eastern Scripts
      [0x0610, 0x061A], // Arabic
      [0x064B, 0x065F], // Arabic
      [0x06D6, 0x06DC], // Arabic
      [0x06DF, 0x06E4], // Arabic
      [0x06E7, 0x06E8], // Arabic
      [0x06EA, 0x06ED], // Arabic
      
      [0x08E4, 0x08FF], // Arabic Extended-A
      
      [0x0591, 0x05BD], // Hebrew
      [0x05BF, 0x05BF], // Hebrew
      [0x05C1, 0x05C2], // Hebrew
      [0x05C4, 0x05C5], // Hebrew
      [0x05C7, 0x05C7], // Hebrew
      
      [0x0859, 0x085B], // Mandaic
      
      [0x0816, 0x0819], // Samaritan
      [0x081B, 0x0823], // Samaritan
      [0x0825, 0x0827], // Samaritan
      [0x0829, 0x082D], // Samaritan
      
      [0x0711, 0x0711], // Syriac
      [0x0730, 0x074A], // Syriac
      
      ////////////////////////////////////////////////
      // Central Asian Scripts
      [0x10AE5, 0x10AE6], // Manichaean
      
      [0x18A9, 0x18A9], // Mongolian
      
      [0x0F00, 0x0FDA], // Tibetan (I'm going to block this whole language)
      
      ////////////////////////////////////////////////
      // South Asian Scripts
      [0x1171D, 0x1172B], // Ahom
      
      [0x0980, 0x0983], // Bengali
      [0x09BC, 0x09BC], // Bengali
      [0x09BE, 0x09C4], // Bengali
      [0x09C7, 0x09C8], // Bengali
      [0x09CB, 0x09CE], // Bengali
      [0x09D7, 0x09D7], // Bengali
      [0x09E2, 0x09E3], // Bengali
      
      [0x11000, 0x11002], // Brahmi
      [0x11038, 0x11046], // Brahmi
      
      [0x11100, 0x11102], // Chakma
      [0x11127, 0x11134], // Chakma
      
      [0x0900, 0x0903], // Devanagari
      [0x093A, 0x094F], // Devanagari
      [0x0951, 0x0957], // Devanagari
      [0x0962, 0x0963], // Devanagari
      
      [0xA8E0, 0xA8F0], // Devanagari Extended
      
      [0x11300, 0x11303], // Grantha
      [0x1133C, 0x1133C], // Grantha
      [0x1133E, 0x1134D], // Grantha
      [0x11357, 0x11357], // Grantha
      [0x11362, 0x11374], // Grantha
      
      [0x0A81, 0x0A83], // Gujarati
      [0x0ABC, 0x0ABC], // Gujarati
      [0x0ABE, 0x0ACD], // Gujarati
      [0x0AE2, 0x0AE3], // Gujarati
      
      [0x0A01, 0x0A03], // Gurmukhi
      [0x0A3C, 0x0A51], // Gurmukhi
      [0x0A70, 0x0A71], // Gurmukhi
      [0x0A75, 0x0A75], // Gurmukhi
      
      [0x11080, 0x11082], // Kaithi
      [0x110B0, 0x110BA], // Kaithi
      
      [0x0C81, 0x0C83], // Kannada
      [0x0CBC, 0x0CBC], // Kannada
      [0x0CBE, 0x0CD6], // Kannada
      [0x0CE2, 0x0CE3], // Kannada
      
        // assorted
      [0x1920, 0x193B], // Limbu
      
      [0x0D01, 0x0D03], // Malayalam
      [0x0D3E, 0x0D57], // Malayalam
      [0x0D62, 0x0D63], // Malayalam
      
      [0x0D82, 0x0D83], // Sinhala
      [0x0DCA, 0x0DDF], // Sinhala
      [0x0DF2, 0x0DF3], // Sinhala
      
      [0x0C00, 0x0C03], // Telugu
      [0x0C3E, 0x0C56], // Telugu
      [0x0C62, 0x0C63], // Telugu
      
      [0x1CD0, 0x1CD2], // Vedic Extensions
      [0x1CD4, 0x1CE8], // Vedic Extensions
      [0x1CED, 0x1CED], // Vedic Extensions
      [0x1CF2, 0x1CF4], // Vedic Extensions
      [0x1CF8, 0x1CF9], // Vedic Extensions
      
      ////////////////////////////////////////////////
      // Southeast Asian Scripts
      
      [0x0E31, 0x0E31], // Thai
      [0x0E34, 0x0E3A], // Thai
      [0x0E47, 0x0E4F] // Thai
      
      ////////////////////////////////////////////////
      // Indonesia & Oceania Scripts
      
      ////////////////////////////////////////////////
      // East Asian Scripts
      
      ////////////////////////////////////////////////
      // American Scripts
      
      ////////////////////////////////////////////////
      // Other
      
  ];
  
  // even out the arrays with this since nulls wouldn't show up anyways
  if ((blockedRanges.length % 2) == 1)
      blockedRanges.unshift([0, 0]);
  
  blockedRanges.sort(function(a, b)
  {
      if (a[0] < b[0]) return -1;
      if (a[0] > b[0]) return 1;
      return 0;
  });

jQuery('body').find('*').contents().filter(function () { return this.nodeType === 3 && jQuery.trim(this.nodeValue) !== ''; }).each(function(index,value)
  {
      var text = value.textContent;
      var finalText = '';
      var dirty = false;

      for (var i = 0; i < text.length; i++)
      {
          var charCode = text.charCodeAt(i);

          // If in ASCII and ASCII extended limit, don't bother
          // this will drastically decrease processing time
          if (charCode >= 256)
          {
              var filterIndex = (blockedRanges.length / 2) | 0;
              var size = (blockedRanges.length / 4) | 0;
              var lastSize = size;

              while (true)
              {
                  if (blockedRanges[filterIndex][1] < charCode)
                  {
                      filterIndex = (filterIndex + size) | 0;
                      size = Math.ceil(size / 2) | 0;
                  }
                  else if (blockedRanges[filterIndex][0] > charCode)
                  {
                      filterIndex = (filterIndex - size) | 0;
                      size = Math.ceil(size / 2) | 0;
                  }
                  else
                  {
                      break;
                  }

                  if (lastSize == size) break;
                  lastSize = size;
              }

              var filterA = blockedRanges[Math.max(filterIndex - 1, 0)];
              var filterB = blockedRanges[filterIndex];

              if ((charCode >= filterB[0] && charCode <= filterB[1]) ||
                  (charCode >= filterA[0] && charCode <= filterA[1]))
              {
                  charCode = 0;
                  if (!dirty)
                  {
                      dirty = true;
                      finalText = text.substr(0, i);
                  }
              }
          }
          
          if (dirty && charCode > 0)
              finalText += text.charAt(i);
      }
      
      if (dirty)
          value.textContent = finalText;
  });
})();