Simplify PositioningStrategy in FIR diagnostic DSL

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/DiagnosticData.kt

@@ -22,34 +22,34 @@ data class DiagnosticParameter(
     val type: KType
 )
 
-enum class PositioningStrategy(private val strategy: String) {
-    DEFAULT("DEFAULT"),
-    VAL_OR_VAR_NODE("VAL_OR_VAR_NODE"),
-    SECONDARY_CONSTRUCTOR_DELEGATION_CALL("SECONDARY_CONSTRUCTOR_DELEGATION_CALL"),
-    DECLARATION_NAME("DECLARATION_NAME"),
-    DECLARATION_SIGNATURE("DECLARATION_SIGNATURE"),
-    DECLARATION_SIGNATURE_OR_DEFAULT("DECLARATION_SIGNATURE_OR_DEFAULT"),
-    VISIBILITY_MODIFIER("VISIBILITY_MODIFIER"),
-    MODALITY_MODIFIER("MODALITY_MODIFIER"),
-    OPERATOR("OPERATOR"),
-    PARAMETER_DEFAULT_VALUE("PARAMETER_DEFAULT_VALUE"),
-    PARAMETER_VARARG_MODIFIER("PARAMETER_VARARG_MODIFIER"),
-    DECLARATION_RETURN_TYPE("DECLARATION_RETURN_TYPE"),
-    OVERRIDE_MODIFIER("OVERRIDE_MODIFIER"),
-    DOT_BY_QUALIFIED("DOT_BY_QUALIFIED"),
-    OPEN_MODIFIER("OPEN_MODIFIER"),
-    WHEN_EXPRESSION("WHEN_EXPRESSION"),
-    IF_EXPRESSION("IF_EXPRESSION"),
-    VARIANCE_MODIFIER("VARIANCE_MODIFIER"),
-    LATEINIT_MODIFIER("LATEINIT_MODIFIER"),
-    SELECTOR_BY_QUALIFIED("SELECTOR_BY_QUALIFIED"),
-    REFERENCE_BY_QUALIFIED("REFERENCE_BY_QUALIFIED"),
-    PRIVATE_MODIFIER("PRIVATE_MODIFIER"),
-    COMPANION_OBJECT("COMPANION_OBJECT"),
+enum class PositioningStrategy(private val strategy: String? = null) {
+    DEFAULT,
+    VAL_OR_VAR_NODE,
+    SECONDARY_CONSTRUCTOR_DELEGATION_CALL,
+    DECLARATION_NAME,
+    DECLARATION_SIGNATURE,
+    DECLARATION_SIGNATURE_OR_DEFAULT,
+    VISIBILITY_MODIFIER,
+    MODALITY_MODIFIER,
+    OPERATOR,
+    PARAMETER_DEFAULT_VALUE,
+    PARAMETER_VARARG_MODIFIER,
+    DECLARATION_RETURN_TYPE,
+    OVERRIDE_MODIFIER,
+    DOT_BY_QUALIFIED,
+    OPEN_MODIFIER,
+    WHEN_EXPRESSION,
+    IF_EXPRESSION,
+    VARIANCE_MODIFIER,
+    LATEINIT_MODIFIER,
+    SELECTOR_BY_QUALIFIED,
+    REFERENCE_BY_QUALIFIED,
+    PRIVATE_MODIFIER,
+    COMPANION_OBJECT,
 
     ;
 
-    val expressionToCreate get() = "SourceElementPositioningStrategies.$strategy"
+    val expressionToCreate get() = "SourceElementPositioningStrategies.${strategy ?: name}"
 
     companion object {
         const val importToAdd = "org.jetbrains.kotlin.fir.analysis.diagnostics.SourceElementPositioningStrategies"