JS diffString

by Dhanck

HTML

<div class="line1"> The red brown fox jumped over the rolling log.</div>
<div class="line2">The brown spotted fox leaped over the rolling log</div>

CSS

del{background:#FFE6E6}
ins{background:#E6FFE6}

JavaScript

document.body.innerHTML = diffString(
   "The red brown fox jumped over the rolling log.",
   "The brown spotted fox leaped over the rolling log"
);
//diffString($('.line1').text(), $('.line2').text());


//http://ejohn.org/files/jsdiff.js
/*
 * Javascript Diff Algorithm
 *  By John Resig (http://ejohn.org/)
 *  Modified by Chu Alan "sprite"
 *
 * Released under the MIT license.
 *
 * More Info:
 *  http://ejohn.org/projects/javascript-diff-algorithm/
 */

function escape(s) {
    var n = s;
    n = n.replace(/&/g, "&amp;");
    n = n.replace(/</g, "&lt;");
    n = n.replace(/>/g, "&gt;");
    n = n.replace(/"/g, "&quot;");

    return n;
}

function diffString( o, n ) {
  o = o.replace(/\s+$/, '');
  n = n.replace(/\s+$/, '');

  var out = diff(o == "" ? [] : o.split(/\s+/), n == "" ? [] : n.split(/\s+/) );
  var str = "";

  var oSpace = o.match(/\s+/g);
  if (oSpace == null) {
    oSpace = ["\n"];
  } else {
    oSpace.push("\n");
  }
  var nSpace = n.match(/\s+/g);
  if (nSpace == null) {
    nSpace = ["\n"];
  } else {
    nSpace.push("\n");
  }

  if (out.n.length == 0) {
      for (var i = 0; i < out.o.length; i++) {
        str += '<del>' + escape(out.o[i]) + oSpace[i] + "</del>";
      }
  } else {
    if (out.n[0].text == null) {
      for (n = 0; n < out.o.length && out.o[n].text == null; n++) {
        str += '<del>' + escape(out.o[n]) + oSpace[n] + "</del>";
      }
    }

    for ( var i = 0; i < out.n.length; i++ ) {
      if (out.n[i].text == null) {
        str += '<ins>' + escape(out.n[i]) + nSpace[i] + "</ins>";
      } else {
        var pre = "";

        for (n = out.n[i].row + 1; n < out.o.length && out.o[n].text == null; n++ ) {
          pre += '<del>' + escape(out.o[n]) + oSpace[n] + "</del>";
        }
        str += " " + out.n[i].text + nSpace[i] + pre;
      }
    }
  }
  
  return str;
}

function randomColor() {
    return "rgb(" + (Math.random() * 100) + "%, " + 
                    (Math.random() * 100) + "%, " + 
               ...