2 fixes for custom ColorSpaces

Breaks the loop when the format is found.

Allows format not to define a parse() method.

Author: sidewayss

Diff for: src/parse.js

@@ -108,7 +108,7 @@ export default function parse (str, options) {
 	}
 	else {
 		// Custom, colorspace-specific format
-		for (let space of ColorSpace.all) {
+		loop: for (let space of ColorSpace.all) {
 			for (let formatId in space.formats) {
 				let format = space.formats[formatId];
 
@@ -123,15 +123,15 @@ export default function parse (str, options) {
 				// Convert to Format object
 				format = space.getFormat(format);
 
-				let color = format.parse(env.str);
+				let color = format.parse?.(env.str);
 
 				if (color) {
 					if (meta) {
 						Object.assign(meta, { format, formatId });
 					}
 
 					ret = color;
-					break;
+					break loop;
 				}
 			}
 		}