/*

 jQuery easymark plugin

 Highlights multiple keywords in a given search area.

 Copyright 2011 Isaac Tewolde for Thoora.com

 Based on work by Johann Burkhard & Marcel Stör

 Marcel Stör
 <http://www.frightanic.com/projects/lenient-jquery-highlight-plugin-javascript/>

 Johann Burkhard
 <http://johannburkard.de/blog/programming/javascript/dynacloud-a-dynamic-javascript-tag-keyword-cloud-with-jquery.html>

 MIT license.

 */

/*
 * Highlights the given terms in all text nodes.
 */

(function($) {
	/*
	 * Map generated from ftp.unicode.org/Public/UNIDATA/UnicodeData.txt. Maps each
	 * upper-case basic alphabet character in the A-Z range to a regex character
	 * class that contains all variations (accented, unaccented, upper-case,
	 * lower-case) of this character (e.g. A->[AaÄäå....]).
	 */
	var charToAccentedCharClassMap = {
		'A' : '[Aa\xaa\xc0-\xc5\xe0-\xe5\u0100-\u0105\u01cd\u01ce\u0200-\u0203\u0226\u0227\u1d2c\u1d43\u1e00\u1e01\u1e9a\u1ea0-\u1ea3\u2090\u2100\u2101\u213b\u249c\u24b6\u24d0\u3371-\u3374\u3380-\u3384\u3388\u3389\u33a9-\u33af\u33c2\u33ca\u33df\u33ff\uff21\uff41]',
		'B' : '[Bb\u1d2e\u1d47\u1e02-\u1e07\u212c\u249d\u24b7\u24d1\u3374\u3385-\u3387\u33c3\u33c8\u33d4\u33dd\uff22\uff42]',
		'C' : '[Cc\xc7\xe7\u0106-\u010d\u1d9c\u2100\u2102\u2103\u2105\u2106\u212d\u216d\u217d\u249e\u24b8\u24d2\u3376\u3388\u3389\u339d\u33a0\u33a4\u33c4-\u33c7\uff23\uff43]',
		'D' : '[Dd\u010e\u010f\u01c4-\u01c6\u01f1-\u01f3\u1d30\u1d48\u1e0a-\u1e13\u2145\u2146\u216e\u217e\u249f\u24b9\u24d3\u32cf\u3372\u3377-\u3379\u3397\u33ad-\u33af\u33c5\u33c8\uff24\uff44]',
		'E' : '[Ee\xc8-\xcb\xe8-\xeb\u0112-\u011b\u0204-\u0207\u0228\u0229\u1d31\u1d49\u1e18-\u1e1b\u1eb8-\u1ebd\u2091\u2121\u212f\u2130\u2147\u24a0\u24ba\u24d4\u3250\u32cd\u32ce\uff25\uff45]',
		'F' : '[Ff\u1da0\u1e1e\u1e1f\u2109\u2131\u213b\u24a1\u24bb\u24d5\u338a-\u338c\u3399\ufb00-\ufb04\uff26\uff46]',
		'G' : '[Gg\u011c-\u0123\u01e6\u01e7\u01f4\u01f5\u1d33\u1d4d\u1e20\u1e21\u210a\u24a2\u24bc\u24d6\u32cc\u32cd\u3387\u338d-\u338f\u3393\u33ac\u33c6\u33c9\u33d2\u33ff\uff27\uff47]',
		'H' : '[Hh\u0124\u0125\u021e\u021f\u02b0\u1d34\u1e22-\u1e2b\u1e96\u210b-\u210e\u24a3\u24bd\u24d7\u32cc\u3371\u3390-\u3394\u33ca\u33cb\u33d7\uff28\uff48]',
		'I' : '[Ii\xcc-\xcf\xec-\xef\u0128-\u0130\u0132\u0133\u01cf\u01d0\u0208-\u020b\u1d35\u1d62\u1e2c\u1e2d\u1ec8-\u1ecb\u2071\u2110\u2111\u2139\u2148\u2160-\u2163\u2165-\u2168\u216a\u216b\u2170-\u2173\u2175-\u2178\u217a\u217b\u24a4\u24be\u24d8\u337a\u33cc\u33d5\ufb01\ufb03\uff29\uff49]',
		'J' : '[Jj\u0132-\u0135\u01c7-\u01cc\u01f0\u02b2\u1d36\u2149\u24a5\u24bf\u24d9\u2c7c\uff2a\uff4a]',
		'K' : '[Kk\u0136\u0137\u01e8\u01e9\u1d37\u1d4f\u1e30-\u1e35\u212a\u24a6\u24c0\u24da\u3384\u3385\u3389\u338f\u3391\u3398\u339e\u33a2\u33a6\u33aa\u33b8\u33be\u33c0\u33c6\u33cd-\u33cf\uff2b\uff4b]',
		'L' : '[Ll\u0139-\u0140\u01c7-\u01c9\u02e1\u1d38\u1e36\u1e37\u1e3a-\u1e3d\u2112\u2113\u2121\u216c\u217c\u24a7\u24c1\u24db\u32cf\u3388\u3389\u33d0-\u33d3\u33d5\u33d6\u33ff\ufb02\ufb04\uff2c\uff4c]',
		'M' : '[Mm\u1d39\u1d50\u1e3e-\u1e43\u2120\u2122\u2133\u216f\u217f\u24a8\u24c2\u24dc\u3377-\u3379\u3383\u3386\u338e\u3392\u3396\u3399-\u33a8\u33ab\u33b3\u33b7\u33b9\u33bd\u33bf\u33c1\u33c2\u33ce\u33d0\u33d4-\u33d6\u33d8\u33d9\u33de\u33df\uff2d\uff4d]',
		'N' : '[Nn\xd1\xf1\u0143-\u0149\u01ca-\u01cc\u01f8\u01f9\u1d3a\u1e44-\u1e4b\u207f\u2115\u2116\u24a9\u24c3\u24dd\u3381\u338b\u339a\u33b1\u33b5\u33bb\u33cc\u33d1\uff2e\uff4e]',
		'O' : '[Oo\xba\xd2-\xd6\xf2-\xf6\u014c-\u0151\u01a0\u01a1\u01d1\u01d2\u01ea\u01eb\u020c-\u020f\u022e\u022f\u1d3c\u1d52\u1ecc-\u1ecf\u2092\u2105\u2116\u2134\u24aa\u24c4\u24de\u3375\u33c7\u33d2\u33d6\uff2f\uff4f]',
		'P' : '[Pp\u1d3e\u1d56\u1e54-\u1e57\u2119\u24ab\u24c5\u24df\u3250\u3371\u3376\u3380\u338a\u33a9-\u33ac\u33b0\u33b4\u33ba\u33cb\u33d7-\u33da\uff30\uff50]',
		'Q' : '[Qq\u211a\u24ac\u24c6\u24e0\u33c3\uff31\uff51]',
		'R' : '[Rr\u0154-\u0159\u0210-\u0213\u02b3\u1d3f\u1d63\u1e58-\u1e5b\u1e5e\u1e5f\u20a8\u211b-\u211d\u24ad\u24c7\u24e1\u32cd\u3374\u33ad-\u33af\u33da\u33db\uff32\uff52]',
		'S' : '[Ss\u015a-\u0161\u017f\u0218\u0219\u02e2\u1e60-\u1e63\u20a8\u2101\u2120\u24ae\u24c8\u24e2\u33a7\u33a8\u33ae-\u33b3\u33db\u33dc\ufb06\uff33\uff53]',
		'T' : '[Tt\u0162-\u0165\u021a\u021b\u1d40\u1d57\u1e6a-\u1e71\u1e97\u2121\u2122\u24af\u24c9\u24e3\u3250\u32cf\u3394\u33cf\ufb05\ufb06\uff34\uff54]',
		'U' : '[Uu\xd9-\xdc\xf9-\xfc\u0168-\u0173\u01af\u01b0\u01d3\u01d4\u0214-\u0217\u1d41\u1d58\u1d64\u1e72-\u1e77\u1ee4-\u1ee7\u2106\u24b0\u24ca\u24e4\u3373\u337a\uff35\uff55]',
		'V' : '[Vv\u1d5b\u1d65\u1e7c-\u1e7f\u2163-\u2167\u2173-\u2177\u24b1\u24cb\u24e5\u2c7d\u32ce\u3375\u33b4-\u33b9\u33dc\u33de\uff36\uff56]',
		'W' : '[Ww\u0174\u0175\u02b7\u1d42\u1e80-\u1e89\u1e98\u24b2\u24cc\u24e6\u33ba-\u33bf\u33dd\uff37\uff57]',
		'X' : '[Xx\u02e3\u1e8a-\u1e8d\u2093\u213b\u2168-\u216b\u2178-\u217b\u24b3\u24cd\u24e7\u33d3\uff38\uff58]',
		'Y' : '[Yy\xdd\xfd\xff\u0176-\u0178\u0232\u0233\u02b8\u1e8e\u1e8f\u1e99\u1ef2-\u1ef9\u24b4\u24ce\u24e8\u33c9\uff39\uff59]',
		'Z' : '[Zz\u0179-\u017e\u01f1-\u01f3\u1dbb\u1e90-\u1e95\u2124\u2128\u24b5\u24cf\u24e9\u3390-\u3394\uff3a\uff5a]'
	};

	var settings = {
		'highlightClass' : 'highlight',
		'partial' : false,
		'lenient' : true,
	};

	var methods = {
		init : function(options) {
			if(options) {
				$.extend(settings, options);
			}
		},
		//Highlights all the words that appear on the searchString
		highlight : function(searchString) {
			var input = searchString;
			var lenient = settings.lenient;
			//If lenient settings then we replace the search string with a regex character class A->[AaÄäå....]
			if(settings.lenient) {
				input = createAccentRegexp(searchString);
			}
			//Partial matches are allowed
			if(settings.partial) {
				var inputPattern = new RegExp(input.split(' ').join('|'), 'ig');
			} else {
				var inputPattern = new RegExp('\\b' + input.split(' ').join('|\\b'), 'ig');
			}
			return this.each(function() {
				//alert(this);
				setHighlight(this, inputPattern);
			});
		},
		//Removes all highlights
		removeHighlight : function() {
			return this.find("span." + settings.highlightClass).each(function() {
				this.parentNode.firstChild.nodeName
				with(this.parentNode) {
					replaceChild(this.firstChild, this);
					normalize();
				}
			}).end();
		},
	};

	$.fn.easymark = function(method) {
		// Method calling logic
		if(methods[method]) {
			return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
		} else if( typeof method === 'object' || !method) {
			return methods.init.apply(this, arguments);
		} else {
			$.error('Method ' + method + ' does not exist on jQuery.easyMark');
		}
	};
	/*******************************
	 * Private methods
	 *******************************/
	function log(message) {
		if(window.console && window.console.log)
			window.console.log(message);
	};

	function setHighlight(node, pattern) {
		var skip = 0;
		// Do this only for text nodes. Else go find child nodes...
		if(node.nodeType == 3) {
			var changed = 0;
			var replacement = node.data.replace(pattern, function(match) {
				changed = 1;
				return "<span class='highlight'>" + match + "</span>";
			});
			if(changed) {
				$(node).replaceWith(replacement);
				skip = 1;
			}
		} else {
			if(node.nodeType == 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
				//Check if it has not been highlighted already
				if(!(/(span)/i.test(node.tagName) && ($(node).hasClass(settings.highlightClass)))) {
					for(var i = 0; i < node.childNodes.length; ++i) {
						i += setHighlight(node.childNodes[i], pattern);
					}
				}
			}
		}
		return skip;
	}

	/*******************
	 * Creates a regexp for case- and accent-insensitive matching of a regular
	 * alphabetic string. For each character in the original string the output
	 * contains a regexp character class that matches the character itself and all
	 * unicode variations. So, if the input is "Foo" the function returns
	 * something like [Ff...][OoÖöÒò..][OoÖöÒò..].
	 * Inspiration:
	 * http://stackoverflow.com/questions/227950/programatic-accent-reduction-in-javascript-aka-text-normalization-or-unaccenting
	 *******************/
	function createAccentRegexp(characters) {
		// Replaces all accented characters.
		var deaccentedString = deaccent(characters);
		// Escapes all regexp meta characters.
		var cleanString = deaccentedString.replace(/([|()[{.+*?^$\\])/g, "\\$1");
		var accentReplacer = function(character) {
			return charToAccentedCharClassMap[character] || character;
		};
		// Matches anything *but* a whitespace and replaces it.
		var regexp = cleanString.replace(/\S/g, accentReplacer);
		return regexp;
	}

	/*******************
	 * Returns a string in which each accented and lower-case character from the
	 * input is replaced with the respective upper-case base character in the A-Z
	 * range (e.g. ä->A, è->E, å->A, ë->E). Hence, the return value for
	 * "séléction" is "SELECTION".
	 *******************/
	function deaccent(accentedString) {
		var result = accentedString;
		for(var key in charToAccentedCharClassMap) {
			result = result.replace(new RegExp(charToAccentedCharClassMap[key], "g"), key);
		}
		return result;
	}

})(jQuery);