add exists function for EOptional

Author: MahdiBM

Sources/EnumeratorMacroImpl/Types/EOptional.swift

@@ -76,14 +76,21 @@ extension EOptional: MustacheTransformable {
             switch name {
             case "bool":
                 return false
+            case "exists":
+                return false
             default:
                 return nil
             }
         case let .some(value):
-            if let value = value as? MustacheTransformable {
-                return value.transform(name)
-            } else {
-                return nil
+            switch name {
+            case "exists":
+                return true
+            default:
+                if let value = value as? MustacheTransformable {
+                    return value.transform(name)
+                } else {
+                    return nil
+                }
             }
         }
     }

Tests/EnumeratorMacroTests/EnumeratorMacroTests.swift

@@ -257,15 +257,19 @@ final class EnumeratorMacroTests: XCTestCase {
             """)
             public enum ErrorMessage {
                 case case1 // business_error
-                case case2
+                case case2 // business_error: true
+                case case3 // business_error: false
+                case case4 // business_error: adfasdfdsff
                 case somethingSomething(integration: String)
                 case otherCase(error: Error, isViolation: Bool) // business_error; l8n_params:
             }
             """#,
             expandedSource: #"""
             public enum ErrorMessage {
                 case case1 // business_error
-                case case2
+                case case2 // business_error: true
+                case case3 // business_error: false
+                case case4 // business_error: adfasdfdsff
                 case somethingSomething(integration: String)
                 case otherCase(error: Error, isViolation: Bool) // business_error; l8n_params:
 
@@ -274,6 +278,10 @@ final class EnumeratorMacroTests: XCTestCase {
                     case .case1:
                         return true
                     case .case2:
+                        return true
+                    case .case3:
+                        return false
+                    case .case4:
                         return false
                     case .somethingSomething:
                         return false