XMLFormatter from Kaleo Designer

gistfile1.js

var STR_CHAR_CRLF = '\r\n';
var STR_BLANK = '';
var STR_CHAR_TAB = '\t';

var repeat = function(str, length) {
	return new Array(length + 1).join(str);
};

var XMLUtil = {
	REGEX_TOKEN_1: /(>)\s*(<)(\/*)/g,
	REGEX_TOKEN_2: /.+<\/\w[^>]*>$/,
	REGEX_TOKEN_3: /^<\/\w/,
	REGEX_TOKEN_4: /^<\w[^>]*[^\/]>.*$/,

	format: function(xml) {
		var instance = this;

		var i;
		var pad = 0;
		var formatted = STR_BLANK;

		var lines = xml.replace(instance.REGEX_TOKEN_1, '$1' + STR_CHAR_CRLF + '$2$3').split(/\r?\n/g);

		lines.forEach(
			function(item, index, collection) {
				var indent = 0;

				if (item.match(instance.REGEX_TOKEN_2)) {
					indent = 0;
				}
				else if (item.match(instance.REGEX_TOKEN_3)) {
					if (pad !== 0) {
						pad -= 1;
					}
				}
				else if (item.match(instance.REGEX_TOKEN_4)) {
					indent = 1;
				}

				formatted += repeat(STR_CHAR_TAB, pad) + item + STR_CHAR_CRLF;

				pad += indent;
			}
		);

		return formatted.replace(/^\s+|\s+$/g, "");
	}
};