Function _parsePosition

demo/js/index.js:6690–6719

(v, recObj)

			// @private Parses position-related complex strings like "top left" or "50px 10px" or "70% 20%", etc. which are used for things like transformOrigin or backgroundPosition. Optionally decorates a supplied object (recObj) with the following properties: "ox" (offsetX), "oy" (offsetY), "oxp" (if true, "ox" is a percentage not a pixel value), and "oxy" (if true, "oy" is a percentage not a pixel value)
			_parsePosition = function(v, recObj) {
				if (v === "contain" || v === "auto" || v === "auto auto") {
					return v + " ";
				}
				if (v == null || v === "") { //note: Firefox uses "auto auto" as default whereas Chrome uses "auto".
					v = "0 0";
				}
				var a = v.split(" "),
					x = (v.indexOf("left") !== -1) ? "0%" : (v.indexOf("right") !== -1) ? "100%" : a[0],
					y = (v.indexOf("top") !== -1) ? "0%" : (v.indexOf("bottom") !== -1) ? "100%" : a[1];
				if (y == null) {
					y = (x === "center") ? "50%" : "0";
				} else if (y === "center") {
					y = "50%";
				}
				if (x === "center" || (isNaN(parseFloat(x)) && (x + "").indexOf("=") === -1)) { //remember, the user could flip-flop the values and say "bottom center" or "center bottom", etc. "center" is ambiguous because it could be used to describe horizontal or vertical, hence the isNaN(). If there's an "=" sign in the value, it's relative.
					x = "50%";
				}
				v = x + " " + y + ((a.length > 2) ? " " + a[2] : "");
				if (recObj) {
					recObj.oxp = (x.indexOf("%") !== -1);
					recObj.oyp = (y.indexOf("%") !== -1);
					recObj.oxr = (x.charAt(1) === "=");
					recObj.oyr = (y.charAt(1) === "=");
					recObj.ox = parseFloat(x.replace(_NaNExp, ""));
					recObj.oy = parseFloat(y.replace(_NaNExp, ""));
					recObj.v = v;
				}
				return recObj || v;
			},

			/**
			 * @private Takes an ending value (typically a string, but can be a number) and a starting value and returns the change between the two, looking for relative value indicators like += and -= and it also ignores suffixes (but make sure the ending value starts with a number or +=/-= and that the starting value is a NUMBER!)