/**
*	jQuery Caret methods
*/
(function($) {
	$.fn.extend({
		selectRange: function(selectionStart, selectionEnd) {
			// if there is no content in the input field, then we return false
			if ($(this).length === 0)
				return false;
				
			// retrieve the input object without jQuery funcitonality
			var input = $(this).get(0);
				
			// set defaults
			if (typeof selectionStart === 'undefined')
				var selectionStart = 0;
			if (typeof selectionEnd === 'undefined')
				var selectionEnd = selectionStart;
			
			// do the selection and/or cursor placement
			if (input.setSelectionRange) {
				input.focus();
				input.setSelectionRange(selectionStart, selectionEnd);
			} else if (input.createTextRange) {
				var range = input.createTextRange();
				range.collapse(true);
				range.moveEnd('character', selectionEnd);
				range.moveStart('character', selectionStart);
				range.select();
			}
		},
		
		caretTo: function(index) {
			$(this).selectRange(parseInt(index));
		},
		
		caretToStart: function() {
			$(this).selectRange(0);
		},
		
		caretToEnd: function() {
			$(this).selectRange($(this).length+1);
		},
		
		strSelect: function(string) {
			var input = $(this);
			var match = new RegExp(string, "i").exec(input.value);
			if (match)
				$(this).selectRange(match.index, match.index + match[0].length);
		},
		
		replaceSelection: function(replaceString) {
			var input = $(this);
			if (input.setSelectionRange) {
				var selectionStart = input.selectionStart;
				var selectionEnd = input.selectionEnd;
				input.value = input.value.substring(0, selectionStart)
					+ replaceString
					+ input.value.substring(selectionEnd);
				if (selectionStart != selectionEnd) // has there been a selection
					$(this).selectRange(selectionStart, selectionStart + replaceString.length);
				else
					$(this).caretTo(selectionStart + replaceString.length);
			} else if (document.selection) {
				var range = document.selection.createRange();
				if (range.parentElement() == input) {
					var isCollapsed = range.text == '';
					range.text = replaceString;
					if (!isCollapsed)  {
						range.moveStart('character', -replaceString.length);
						range.select();
					}
				}
			}
		}
	});
})(jQuery);