[java] Add ugly lookahead for local record declarations

so that it can be distinguished from local var decl or other
statements.

pmd-java/etc/grammar/Java.jjt

@@ -478,6 +478,21 @@ public class JavaParser {
     return (jdkVersion == 14 || jdkVersion == 15) && preview;
   }
 
+  private boolean isRecordDeclarationAhead() {
+    int amount = 1;
+    while (amount < 10) {
+        Token next = getToken(amount);
+        if (next.kind == IDENTIFIER && "record".equals(next.image)) {
+            return true;
+        }
+        // stop looking ahead at "=" or ";" or "{"
+        if (next.kind == ASSIGN || next.kind == LBRACE || next.kind == SEMICOLON) {
+            return false;
+        }
+        amount++;
+    }
+    return false;
+  }
 
   // This is a semantic LOOKAHEAD to determine if we're dealing with an assert
   // Note that this can't be replaced with a syntactic lookahead
@@ -1886,10 +1901,10 @@ void BlockStatement():
   LOOKAHEAD( { isNextTokenAnAssert() } ) AssertStatement()
 | LOOKAHEAD( { isYieldStart() } ) YieldStatement()
 |
-  LOOKAHEAD(2147483647, ( "final" | Annotation() )* Type() <IDENTIFIER>, {isRecordTypeSupported() && !isKeyword("record") || !isRecordTypeSupported()})
+  LOOKAHEAD(2147483647, ( "final" | Annotation() )* Type() <IDENTIFIER>, {isRecordTypeSupported() && !isRecordDeclarationAhead() || !isRecordTypeSupported()})
   LocalVariableDeclaration() ";"
 |
-  LOOKAHEAD({isRecordTypeSupported() && !isKeyword("record") || !isRecordTypeSupported()})
+  LOOKAHEAD(1, {isRecordTypeSupported() && !isRecordDeclarationAhead() || !isRecordTypeSupported()})
   Statement()
 |
   // we don't need to lookahead further here

pmd-java/src/test/java/net/sourceforge/pmd/lang/java/ast/Java15PreviewTest.java

@@ -160,7 +160,7 @@ public class Java15PreviewTest {
     public void localRecords() {
         ASTCompilationUnit compilationUnit = java15p.parseResource("LocalRecords.java");
         List<ASTRecordDeclaration> records = compilationUnit.findDescendantsOfType(ASTRecordDeclaration.class);
-        Assert.assertEquals(1, records.size());
+        Assert.assertEquals(5, records.size());
         Assert.assertEquals("MerchantSales", records.get(0).getSimpleName());
         Assert.assertTrue(records.get(0).isLocal());
     }

pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/ast/jdkversiontests/java15p/LocalRecords.java

@@ -23,4 +23,15 @@ public class LocalRecords {
             .map(MerchantSales::merchant)
             .collect(Collectors.toList());
     }
+
+    void methodWithLocalRecordAndModifiers() {
+        final record MyRecord1(String a) {}
+        final static record MyRecord2(String a) {}
+        @Deprecated record MyRecord3(String a) {}
+        final @Deprecated static record MyRecord4(String a) {}
+    }
+
+    void methodWithLocalClass() {
+        class MyLocalClass {}
+    }
 }