fix(xml/parser): Fix parsing of comments (#6449)

Author: alexander-akait

crates/swc_xml_parser/src/error.rs

@@ -81,6 +81,7 @@ impl Error {
                 "Missing whitespace between doctype public and system identifiers".into()
             }
             ErrorKind::NestedComment => "Nested comment".into(),
+            ErrorKind::DoubleHyphenWithInComment => "Double hyper within comment".into(),
             ErrorKind::NoncharacterInInputStream => "Noncharacter in input stream".into(),
             ErrorKind::SurrogateInInputStream => "Surrogate in input stream".into(),
             ErrorKind::SurrogateCharacterReference => "Surrogate character reference".into(),
@@ -150,6 +151,7 @@ pub enum ErrorKind {
     MissingWhitespaceBeforeDoctypeName,
     MissingWhitespaceBetweenDoctypePublicAndSystemIdentifiers,
     NestedComment,
+    DoubleHyphenWithInComment,
     NoncharacterInInputStream,
     SurrogateInInputStream,
     SurrogateCharacterReference,

crates/swc_xml_parser/src/lexer/mod.rs

@@ -1656,6 +1656,7 @@ where
                     // Append a U+002D HYPHEN-MINUS character (-) to the comment token's data.
                     Some(c @ '-') => {
                         self.append_to_comment_token(c, c);
+                        self.emit_error(ErrorKind::DoubleHyphenWithInComment);
                     }
                     // EOF
                     // This is an eof-in-comment parse error. Emit the current comment token.