/**  
 * M?todo  url_encode 
 * @param  String str
 * @return String strEncode
 * @desc: url_encode version 1.0 
 */	
function url_encode(str) 
{ 
	var hex_chars = "0123456789ABCDEF"; 
	var noEncode = /^([a-zA-Z0-9\_\-\.])$/; 
	var n, strCode, hex1, hex2, strEncode = ""; 

	for(n = 0; n < str.length; n++) { 
		if (noEncode.test(str.charAt(n))) { 
			strEncode += str.charAt(n); 
		} else { 
			strCode = str.charCodeAt(n); 
			hex1 = hex_chars.charAt(Math.floor(strCode / 16)); 
			hex2 = hex_chars.charAt(strCode % 16); 
			strEncode += "%" + (hex1 + hex2); 
		} 
	} 
	return strEncode; 
} 



/**  
 * M?todo  url_decode 
 * @param  string str
 * @return string strDecode
 * @desc:  url_decode version 1.0   
 */	
function url_decode(str) 
{ 
	var n, strCode, strDecode = ""; 

	for (n = 0; n < str.length; n++) { 
		if (str.charAt(n) == "%") { 
			strCode = str.charAt(n + 1) + str.charAt(n + 2); 
			strDecode += String.fromCharCode(parseInt(strCode, 16)); 
			n += 2; 
		} 
		else { 
			strDecode += str.charAt(n); 
		} 
	} 

	return strDecode;
} 

function str_replace (search, replace, subject, count) 
{
    var i = 0, j = 0, temp = '', repl = '', sl = 0, fl = 0,
            f = [].concat(search),
            r = [].concat(replace),
            s = subject,
            ra = r instanceof Array, sa = s instanceof Array;
    s = [].concat(s);
    if (count) {
        this.window[count] = 0;
    }

    for (i=0, sl=s.length; i < sl; i++) {
        if (s[i] === '') {
            continue;
        }
        for (j=0, fl=f.length; j < fl; j++) {
            temp = s[i]+'';
            repl = ra ? (r[j] !== undefined ? r[j] : '') : r[0];
            s[i] = (temp).split(f[j]).join(repl);
            if (count && s[i] !== temp) {
                this.window[count] += (temp.length-s[i].length)/f[j].length;}
        }
    }
    return sa ? s : s[0];
}


function str_ireplace ( search, replace, subject ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Martijn Wieringa
    // +      input by: penutbutterjelly
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +    tweaked by: Jack
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Onno Marsman
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Philipp Lenssen
    // *     example 1: str_ireplace('l', 'l', 'HeLLo');
    // *     returns 1: 'Hello'
    // *     example 2: str_ireplace('$', 'foo', '$bar');
    // *     returns 2: 'foobar'

    var i, k = '';
    var searchl = 0;
    var reg;

    var escapeRegex = function(s) {
        return s.replace(/([\\\^\$*+\[\]?{}.=!:(|)])/g, '\\$1');
    };

    search += '';
    searchl = search.length;
    if (!(replace instanceof Array)) {
        replace = [replace];
        if (search instanceof Array) {
            // If search is an array and replace is a string,
            // then this replacement string is used for every value of search
            while (searchl > replace.length) {
                replace[replace.length] = replace[0];
            }
        }
    }

    if (!(search instanceof Array)) {
        search = [search];
    }
    while (search.length>replace.length) {
        // If replace has fewer values than search,
        // then an empty string is used for the rest of replacement values
        replace[replace.length] = '';
    }

    if (subject instanceof Array) {
        // If subject is an array, then the search and replace is performed
        // with every entry of subject , and the return value is an array as well.
        for (k in subject) {
            if (subject.hasOwnProperty(k)) {
                subject[k] = str_ireplace(search, replace, subject[k]);
            }
        }
        return subject;
    }

    searchl = search.length;
    for (i = 0; i < searchl; i++) {
        reg = new RegExp(escapeRegex(search[i]), 'gi');
        subject = subject.replace(reg, replace[i]);
    }

    return subject;
}


function rawurlencode( str ) 
{
    var histogram = {}, tmp_arr = [];
    var ret = str.toString();

    var replacer = function(search, replace, str) {
        var tmp_arr = [];
        tmp_arr = str.split(search);
        return tmp_arr.join(replace);
    };

    // The histogram is identical to the one in urldecode.
    histogram["'"]   = '%27';
    histogram['(']   = '%28';
    histogram[')']   = '%29';
    histogram['*']   = '%2A'; 
    histogram['~']   = '%7E';
    histogram['!']   = '%21';

    // Begin with encodeURIComponent, which most resembles PHP's encoding functions
    ret = encodeURIComponent(ret);

    // Restore spaces, converted by encodeURIComponent which is not rawurlencode compatible
    ret = replacer('%20', ' ', ret); // Custom replace. No regexing

    for (search in histogram) {
        replace = histogram[search];
        ret = replacer(search, replace, ret) // Custom replace. No regexing
    }

    // Uppercase for full PHP compatibility
    return ret.replace(/(\%([a-z0-9]{2}))/g, function(full, m1, m2) {
        return "%"+m2.toUpperCase();
    });

    return ret;
}