[plsql] remove BOM token, skip BOM in parser

pmd-plsql/etc/grammar/PLSQL.jjt

@@ -227,8 +227,6 @@ PARSER_END(PLSQLParserImpl)
  */
 ASTInput Input() : {}
 {
-	[<BOM>] // Unicode BOM
-
 	// SRT 2011-04-17 This syntax breaks the parser when fields of record.attach* are referenced (attachLibrary())*
 	(
 	 (LOOKAHEAD(7) PackageSpecification()
@@ -4505,7 +4503,6 @@ void AlterTrigger()  :
 // Copyright (C) 2002 Albert Tumanov
 
 /* WHITE SPACE */
-TOKEN : { <BOM: "\ufeff" > }
 
 SKIP :
 {

pmd-plsql/src/main/java/net/sourceforge/pmd/lang/plsql/ast/PLSQLParser.java

@@ -30,6 +30,11 @@ public class PLSQLParser extends JjtreeParserAdapter<ASTInput> {
         return new JavaccTokenDocument(fullText);
     }
 
+    @Override
+    public ASTInput parse(String fileName, Reader source) throws ParseException {
+        return super.parse(fileName, IOUtil.skipBOM(source));
+    }
+
     @Override
     protected ASTInput parseImpl(CharStream cs, ParserOptions options) throws ParseException {
         return new PLSQLParserImpl(cs).Input();