/*global doc, navigator */

var DOCUMENT_POSITION_PRECEDING = 2; // Node.DOCUMENT_POSITION_PRECEDING
var ELEMENT_NODE = 1;                // Node.ELEMENT_NODE;
var TEXT_NODE = 3;                   // Node.TEXT_NODE;
var SHOW_ELEMENT = 1;                // NodeFilter.SHOW_ELEMENT;
var SHOW_TEXT = 4;                   // NodeFilter.SHOW_TEXT;
var FILTER_ACCEPT = 1;               // NodeFilter.FILTER_ACCEPT;
var FILTER_SKIP = 3;                 // NodeFilter.FILTER_SKIP;

var START_TO_START = 0; // Range.START_TO_START
var START_TO_END = 1;   // Range.START_TO_END
var END_TO_END = 2;     // Range.END_TO_END
var END_TO_START = 3;   // Range.END_TO_START

var win = doc.defaultView;
var body = doc.body;

var ua = navigator.userAgent;

var isIOS = /iP(?:ad|hone|od)/.test( ua );
var isMac = /Mac OS X/.test( ua );

var isGecko = /Gecko\//.test( ua );
var isIE = /Trident\//.test( ua );
var isIE8 = ( win.ie === 8 );
var isOpera = !!win.opera;
var isWebKit = /WebKit\//.test( ua );

var ctrlKey = isMac ? 'meta-' : 'ctrl-';

var useTextFixer = isIE || isOpera;
var cantFocusEmptyTextNodes = isIE || isWebKit;
var losesSelectionOnBlur = isIE;

var notWS = /\S/;

var indexOf = Array.prototype.indexOf;