Advance cursor when unknown code during Enum parsing (#6061)

Author: greg-at-moderne

rewrite-groovy/src/main/java/org/openrewrite/groovy/GroovyParserVisitor.java

@@ -515,13 +515,12 @@ private J.EnumValue visitEnumField(FieldNode field) {
                         depth--;
                         cursor++;
                     }
-                    argCount++;
-                    // Safety check: if cursor didn't advance, throw an exception to avoid infinite loop
                     if (cursor == cursorBeforeIteration) {
-                        throw new IllegalStateException(
-                                "Parser error: unable to parse enum constructor arguments at position " + cursor +
-                                        " near '" + source.substring(Math.max(0, cursor - 20), Math.min(source.length(), cursor + 20)) + "'"
-                        );
+                        // We are not facing an opening of a new parens/delimiter, no whitespace, just a usual piece of code - e.g. an operator like `+`.
+                        // As we are not parsing it, just grabing the code into a String, it's safe to advance.
+                        cursor++;
+                    } else {
+                        argCount++;
                     }
                 }
                 String argsAsString = source.substring(start, cursor);

rewrite-groovy/src/test/java/org/openrewrite/groovy/tree/EnumTest.java

@@ -316,4 +316,25 @@ enum Mapped {
         );
     }
 
+    @Test
+    void expressionsInArguments() {
+        rewriteRun(
+          groovy(
+            """
+            enum Status {
+                GOOD(PREFIX + " one. ", PREFIX + " two. ")
+
+                public static final String PREFIX = "{object}"
+                String a
+                String b
+
+                Status(String a, String b) {
+                    this.a = a
+                    this.b = b
+                }
+            }
+            """
+          )
+        );
+    }
 }