remove error recovery for CSS meta-syntax and ";"

Author: evanw

internal/css_parser/css_parser.go

@@ -1295,15 +1295,6 @@ loop:
 		case css_lexer.TOpenBrace, css_lexer.TEndOfFile:
 			break loop
 
-		case css_lexer.TSemicolon:
-			// Error recovery if the block is omitted (likely some CSS meta-syntax)
-			if !isAlreadyInvalid {
-				p.expect(css_lexer.TOpenBrace)
-			}
-			prelude := p.convertTokens(p.tokens[preludeStart:p.index])
-			p.advance()
-			return css_ast.Rule{Loc: preludeLoc, Data: &css_ast.RQualified{Prelude: prelude}}
-
 		default:
 			p.parseComponentValue()
 		}
@@ -1343,15 +1334,6 @@ stop:
 		case css_lexer.TEndOfFile, css_lexer.TSemicolon, css_lexer.TCloseBrace:
 			break stop
 
-		case css_lexer.TOpenBrace:
-			// Error recovery if there is an unexpected block (likely some CSS meta-syntax)
-			p.parseComponentValue()
-			p.eat(css_lexer.TWhitespace)
-			if ok && !p.peek(css_lexer.TSemicolon) {
-				p.expect(css_lexer.TSemicolon)
-			}
-			break stop
-
 		default:
 			p.parseComponentValue()
 		}

internal/css_parser/css_parser_test.go

@@ -738,9 +738,10 @@ func TestBadQualifiedRules(t *testing.T) {
 	expectParseError(t, "$bad: rule;", "<stdin>: WARNING: Unexpected \"$\"\n")
 	expectParseError(t, "$bad { color: red }", "<stdin>: WARNING: Unexpected \"$\"\n")
 	expectParseError(t, "a { div.major { color: blue } color: red }", "<stdin>: WARNING: Expected \":\" but found \".\"\n")
-	expectParseError(t, "a { div:hover { color: blue } color: red }", "<stdin>: WARNING: Expected \";\"\n")
+	expectParseError(t, "a { div:hover { color: blue } color: red }", "")
 	expectParseError(t, "a { div:hover { color: blue }; color: red }", "")
 	expectParseError(t, "a { div:hover { color: blue } ; color: red }", "")
+	expectParseError(t, "! { x: {} }", "<stdin>: WARNING: Unexpected \"!\"\n")
 }
 
 func TestAtRule(t *testing.T) {

internal/css_printer/css_printer_test.go

@@ -145,9 +145,11 @@ func TestNestedSelector(t *testing.T) {
 }
 
 func TestBadQualifiedRules(t *testing.T) {
-	expectPrinted(t, "$bad: rule;", "$bad: rule {\n}\n")
-	expectPrinted(t, "a { div.major { color: blue } color: red }", "a {\n  div.major { color: blue };\n  color: red;\n}\n")
-	expectPrinted(t, "a { div:hover { color: blue } color: red }", "a {\n  div: hover { color: blue };\n  color: red;\n}\n")
+	expectPrinted(t, ";", "; {\n}\n")
+	expectPrinted(t, "$bad: rule;", "$bad: rule; {\n}\n")
+	expectPrinted(t, "a {}; b {};", "a {\n}\n; b {\n}\n; {\n}\n")
+	expectPrinted(t, "a { div.major { color: blue } color: red }", "a {\n  div.major { color: blue } color: red;\n}\n")
+	expectPrinted(t, "a { div:hover { color: blue } color: red }", "a {\n  div: hover { color: blue } color: red;\n}\n")
 	expectPrinted(t, "a { div:hover { color: blue }; color: red }", "a {\n  div: hover { color: blue };\n  color: red;\n}\n")
 
 	expectPrinted(t, "$bad{ color: red }", "$bad {\n  color: red;\n}\n")