Improve dash detection (#16)

luizbills · web-flow · commit 4b25c283eaf4 · 2022-09-10T00:27:33.000+02:00
diff --git a/css.escape.js b/css.escape.js
@@ -28,6 +28,16 @@
 		var codeUnit;
 		var result = '';
 		var firstCodeUnit = string.charCodeAt(0);
+
+		if (
+			// If the character is the first character and is a `-` (U+002D), and
+			// there is no second character, […]
+			length == 1 &&
+			firstCodeUnit == 0x002D
+		) {
+			return '\\' + string;
+		}
+
 		while (++index < length) {
 			codeUnit = string.charCodeAt(index);
 			// Note: there’s no need to special-case astral symbols, surrogate
@@ -60,17 +70,6 @@
 				continue;
 			}
 
-			if (
-				// If the character is the first character and is a `-` (U+002D), and
-				// there is no second character, […]
-				index == 0 &&
-				length == 1 &&
-				codeUnit == 0x002D
-			) {
-				result += '\\' + string.charAt(index);
-				continue;
-			}
-
 			// If the character is not handled by one of the above rules and is
 			// greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
 			// is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
@@ -91,7 +90,6 @@
 			// Otherwise, the escaped character.
 			// https://drafts.csswg.org/cssom/#escape-a-character
 			result += '\\' + string.charAt(index);
-
 		}
 		return result;
 	};
