diff --git a/src/diff.filter.js b/src/diff.filter.js
new file mode 100644
index 0000000..5d72d1a
--- /dev/null
+++ b/src/diff.filter.js
@@ -0,0 +1,178 @@
+'use strict';
+
+angular.module('diff', [])
+ .filter('diff', function () {
+
+ /*
+ * 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, '&');
+ n = n.replace(//g, '>');
+ n = n.replace(/'/g, '"');
+
+ 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 i;
+
+ 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 (i = 0; i < out.o.length; i++) {
+ str += '' + escape(out.o[i]) + oSpace[i] + '';
+ }
+ } else {
+ if (out.n[0].text === null) {
+ for (n = 0; n < out.o.length && out.o[n].text === null; n++) {
+ str += '' + escape(out.o[n]) + oSpace[n] + '';
+ }
+ }
+
+ for (i = 0; i < out.n.length; i++ ) {
+ if (!out.n[i].text) {
+ str += '' + escape(out.n[i]) + nSpace[i] + '';
+ } else {
+ var pre = '';
+
+ for (n = out.n[i].row + 1; n < out.o.length && !out.o[n].text; n++ ) {
+ pre += '' + escape(out.o[n]) + oSpace[n] + '';
+ }
+ str += ' ' + out.n[i].text + nSpace[i] + pre;
+ }
+ }
+ }
+
+ return str;
+ }
+
+ function randomColor() {
+ return 'rgb(' + (Math.random() * 100) + '%, ' +
+ (Math.random() * 100) + '%, ' +
+ (Math.random() * 100) + '%)';
+ }
+
+ function diffString2( o, n ) {
+ var i;
+
+ o = o.replace(/\s+$/, '');
+ n = n.replace(/\s+$/, '');
+
+ var out = diff(o === '' ? [] : o.split(/\s+/), n === '' ? [] : n.split(/\s+/) );
+
+ var oSpace = o.match(/\s+/g);
+ if (!oSpace) {
+ oSpace = ['\n'];
+ } else {
+ oSpace.push('\n');
+ }
+ var nSpace = n.match(/\s+/g);
+ if (!nSpace) {
+ nSpace = ['\n'];
+ } else {
+ nSpace.push('\n');
+ }
+
+ var os = '';
+ var colors = [];
+ for (i = 0; i < out.o.length; i++) {
+ colors[i] = randomColor();
+
+ if (out.o[i].text) {
+ os += '' +
+ escape(out.o[i].text) + oSpace[i] + '';
+ } else {
+ os += '' + escape(out.o[i]) + oSpace[i] + '';
+ }
+ }
+
+ var ns = '';
+ for (i = 0; i < out.n.length; i++) {
+ if (out.n[i].text) {
+ ns += '' +
+ escape(out.n[i].text) + nSpace[i] + '';
+ } else {
+ ns += '' + escape(out.n[i]) + nSpace[i] + '';
+ }
+ }
+
+ return { o : os , n : ns };
+ }
+
+ function diff( o, n ) {
+ var ns = {};
+ var os = {};
+ var i;
+
+ for (i = 0; i < n.length; i++ ) {
+ if ( !ns[ n[i] ] ) {
+ ns[ n[i] ] = { rows: [], o: null };
+ }
+ ns[ n[i] ].rows.push( i );
+ }
+
+ for (i = 0; i < o.length; i++ ) {
+ if ( !os[ o[i] ] ){
+ os[ o[i] ] = { rows: [], n: null };
+ }
+ os[ o[i] ].rows.push( i );
+ }
+
+ for (i in ns ) {
+ if ( ns[i].rows.length === 1 && typeof(os[i]) !== 'undefined' && os[i].rows.length === 1 ) {
+ n[ ns[i].rows[0] ] = { text: n[ ns[i].rows[0] ], row: os[i].rows[0] };
+ o[ os[i].rows[0] ] = { text: o[ os[i].rows[0] ], row: ns[i].rows[0] };
+ }
+ }
+
+ for (i = 0; i < n.length - 1; i++ ) {
+ if ( n[i].text !== null && n[i+1].text === null && n[i].row + 1 < o.length && !o[ n[i].row + 1 ].text &&
+ n[i+1] === o[ n[i].row + 1 ] ) {
+ n[i+1] = { text: n[i+1], row: n[i].row + 1 };
+ o[n[i].row+1] = { text: o[n[i].row+1], row: i + 1 };
+ }
+ }
+
+ for (i = n.length - 1; i > 0; i-- ) {
+ if ( n[i].text && !n[i-1].text && n[i].row > 0 && !o[ n[i].row - 1 ].text &&
+ n[i-1] === o[ n[i].row - 1 ] ) {
+ n[i-1] = { text: n[i-1], row: n[i].row - 1 };
+ o[n[i].row-1] = { text: o[n[i].row-1], row: i - 1 };
+ }
+ }
+
+ return { o: o, n: n };
+ }
+
+ // Actual filter
+ return function(input, match) {
+ return diffString(input, match);
+ };
+});
diff --git a/src/diff.js b/src/diff.js
new file mode 100644
index 0000000..3e3cc47
--- /dev/null
+++ b/src/diff.js
@@ -0,0 +1,160 @@
+/*
+ * 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, "&");
+ n = n.replace(//g, ">");
+ n = n.replace(/"/g, """);
+
+ 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 += '' + escape(out.o[i]) + oSpace[i] + "";
+ }
+ } else {
+ if (out.n[0].text == null) {
+ for (n = 0; n < out.o.length && out.o[n].text == null; n++) {
+ str += '' + escape(out.o[n]) + oSpace[n] + "";
+ }
+ }
+
+ for ( var i = 0; i < out.n.length; i++ ) {
+ if (out.n[i].text == null) {
+ str += '' + escape(out.n[i]) + nSpace[i] + "";
+ } else {
+ var pre = "";
+
+ for (n = out.n[i].row + 1; n < out.o.length && out.o[n].text == null; n++ ) {
+ pre += '' + escape(out.o[n]) + oSpace[n] + "";
+ }
+ str += " " + out.n[i].text + nSpace[i] + pre;
+ }
+ }
+ }
+
+ return str;
+}
+
+function randomColor() {
+ return "rgb(" + (Math.random() * 100) + "%, " +
+ (Math.random() * 100) + "%, " +
+ (Math.random() * 100) + "%)";
+}
+function diffString2( o, n ) {
+ o = o.replace(/\s+$/, '');
+ n = n.replace(/\s+$/, '');
+
+ var out = diff(o == "" ? [] : o.split(/\s+/), n == "" ? [] : n.split(/\s+/) );
+
+ 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");
+ }
+
+ var os = "";
+ var colors = new Array();
+ for (var i = 0; i < out.o.length; i++) {
+ colors[i] = randomColor();
+
+ if (out.o[i].text != null) {
+ os += '' +
+ escape(out.o[i].text) + oSpace[i] + "";
+ } else {
+ os += "" + escape(out.o[i]) + oSpace[i] + "";
+ }
+ }
+
+ var ns = "";
+ for (var i = 0; i < out.n.length; i++) {
+ if (out.n[i].text != null) {
+ ns += '' +
+ escape(out.n[i].text) + nSpace[i] + "";
+ } else {
+ ns += "" + escape(out.n[i]) + nSpace[i] + "";
+ }
+ }
+
+ return { o : os , n : ns };
+}
+
+function diff( o, n ) {
+ var ns = new Object();
+ var os = new Object();
+
+ for ( var i = 0; i < n.length; i++ ) {
+ if ( ns[ n[i] ] == null )
+ ns[ n[i] ] = { rows: new Array(), o: null };
+ ns[ n[i] ].rows.push( i );
+ }
+
+ for ( var i = 0; i < o.length; i++ ) {
+ if ( os[ o[i] ] == null )
+ os[ o[i] ] = { rows: new Array(), n: null };
+ os[ o[i] ].rows.push( i );
+ }
+
+ for ( var i in ns ) {
+ if ( ns[i].rows.length == 1 && typeof(os[i]) != "undefined" && os[i].rows.length == 1 ) {
+ n[ ns[i].rows[0] ] = { text: n[ ns[i].rows[0] ], row: os[i].rows[0] };
+ o[ os[i].rows[0] ] = { text: o[ os[i].rows[0] ], row: ns[i].rows[0] };
+ }
+ }
+
+ for ( var i = 0; i < n.length - 1; i++ ) {
+ if ( n[i].text != null && n[i+1].text == null && n[i].row + 1 < o.length && o[ n[i].row + 1 ].text == null &&
+ n[i+1] == o[ n[i].row + 1 ] ) {
+ n[i+1] = { text: n[i+1], row: n[i].row + 1 };
+ o[n[i].row+1] = { text: o[n[i].row+1], row: i + 1 };
+ }
+ }
+
+ for ( var i = n.length - 1; i > 0; i-- ) {
+ if ( n[i].text != null && n[i-1].text == null && n[i].row > 0 && o[ n[i].row - 1 ].text == null &&
+ n[i-1] == o[ n[i].row - 1 ] ) {
+ n[i-1] = { text: n[i-1], row: n[i].row - 1 };
+ o[n[i].row-1] = { text: o[n[i].row-1], row: i - 1 };
+ }
+ }
+
+ return { o: o, n: n };
+}
diff --git a/tests/diff.filter.js b/tests/diff.filter.js
new file mode 100644
index 0000000..0c9b35f
--- /dev/null
+++ b/tests/diff.filter.js
@@ -0,0 +1,16 @@
+'use strict';
+
+describe('filter', function() {
+
+ beforeEach(module('diff'));
+
+ describe('checkmark', function() {
+
+ it('should convert a string to the diff value with another string', inject(function(diffFilter) {
+ expect(diffFilter(
+ 'The red brown fox jumped over the rolling log.',
+ 'The brown spotted fox leaped over the rolling log')).toBe(
+ ' The red brown spotted fox jumped leaped over the rolling log.\nlog\n');
+ }));
+ });
+});