/*
 * jQuery plugin: fieldSelection - v0.1.0 - last change: 2006-12-16
 * (c) 2006 Alex Brem <alex@0xab.cd> - http://blog.0xab.cd
 * modified by CH June 10, 2008 
 */

(function() {

	var fieldSelection = {

		getSelection: function() {

			var e = this.jquery ? this[0] : this;

			return (

				/* mozilla / dom 3.0 */
				('selectionStart' in e && function() {
					var l = e.selectionEnd - e.selectionStart;
					return { start: e.selectionStart, end: e.selectionEnd, length: l, text: e.value.substr(e.selectionStart, l) };
				}) ||

				/* exploder */
				(document.selection && function() {

					e.focus();

					var r = document.selection.createRange(); // r is a TextRange object
					if (r == null) {
						return { start: 0, end: e.value.length, length: 0 }
					}
	
	                // get the selected text and replace '\r'
	                var txt = r.text;
	                txt = txt.replace(/\r*/g, '');
	                
	                // count chars before selection
	                var wt = r.duplicate();
	                wt.moveToElementText(e);
	                var charBefore = -1;
					while(wt.inRange(r)) { // fix most of the ie bugs with linefeeds...
						wt.moveStart('character');
						charBefore ++;
					}
					
					// count chars in selection
					/*
					r.setEndPoint('StartToEnd', r);
					r.setEndPoint('EndToEnd', wt);
					var charIn = 0;
					while(wt.inRange(r)) { // fix most of the ie bugs with linefeeds...
						wt.moveStart('character');
						charIn ++;
					}
					*/
					return { start: charBefore, end: charBefore + txt.length, length: txt.length, text: txt };
				}) ||

				/* browser not supported */
				function() {
					return { start: 0, end: e.value.length, length: 0 };
				}

			)();

		},

		replaceSelection: function() {

			var e = this.jquery ? this[0] : this;
			var text = arguments[0] || '';

			return (

				/* mozilla / dom 3.0 */
				('selectionStart' in e && function() {
				    var newPos = e.selectionStart + text.length;
					e.value = e.value.substr(0, e.selectionStart) + text + e.value.substr(e.selectionEnd, e.value.length);
					e.setSelectionRange(newPos, newPos);
					return this;
				}) ||

				/* exploder */
				(document.selection && function() {
					e.focus();
					document.selection.createRange().text = text;
					return this;
				}) ||

				/* browser not supported */
				function() {
					e.value += text;
					return this;
				}

			)();

		}

	};

	jQuery.each(fieldSelection, function(i) { jQuery.fn[i] = this; });

})();