simplify JS parsing step

src/parse/read/script.js

@@ -1,28 +1,14 @@
-import { parse, tokenizer } from 'acorn';
+import { parse } from 'acorn';
 import spaces from '../../utils/spaces.js';
 
+const scriptClosingTag = '<\/script>';
+
 export default function readScript ( parser, start, attributes ) {
 	const scriptStart = parser.index;
-	let scriptEnd = null;
-
-	for ( const token of tokenizer( parser.remaining() ) ) {
-		parser.index = scriptStart + token.end;
-		parser.allowWhitespace();
-
-		scriptEnd = parser.index;
-
-		if ( parser.eat( '/script>' ) ) {
-			// this happens with trailing comments!
-			scriptEnd -= 1;
-			break;
-		}
-
-		if ( parser.eat( '<\/script>' ) ) {
-			break;
-		}
-	}
+	const scriptEnd = parser.template.indexOf( scriptClosingTag, scriptStart );
 
 	const source = spaces( scriptStart ) + parser.template.slice( scriptStart, scriptEnd );
+	parser.index = scriptEnd + scriptClosingTag.length;
 
 	let ast;
 
@@ -38,7 +24,6 @@ export default function readScript ( parser, start, attributes ) {
 	if ( !ast.body.length ) return null;
 
 	ast.start = scriptStart;
-
 	return {
 		start,
 		end: parser.index,