Applied refactoring

rpgJavaInterpreter-core/src/main/kotlin/com/smeup/rpgparser/interpreter/internal_interpreter.kt

@@ -287,17 +287,9 @@ open class InternalInterpreter(
                                  * In accord to documentation (see https://www.ibm.com/docs/en/i/7.5?topic=codes-plist-identify-parameter-list):
                                  *  when control transfers to called program, at the beginning, the contents of the Result field is placed in
                                  *  the Factor 1 field.
-                                 * TODO: IS NECESSARY A REFACTORING!!!
                                  */
-                                compilationUnit.entryPlist?.params
-                                    ?.filter { plistParam -> plistParam.factor1 is DataRefExpr }
-                                    ?.any { plistParamFiltered -> (plistParamFiltered.factor1 as DataRefExpr).variable.name.equals(it.name, true) } == true -> {
-
-                                    val resultName = compilationUnit.entryPlist?.params
-                                        ?.filter { plistParam -> plistParam.factor1 is DataRefExpr }
-                                        ?.firstOrNull { plistParamFiltered -> (plistParamFiltered.factor1 as DataRefExpr).variable.name.equals(it.name, true) }
-                                        ?.result?.name
-
+                                it.isInPlist(compilationUnit) -> {
+                                    val resultName = it.getResultNameByFactor1(compilationUnit)
                                     if (resultName == null || initialValues[resultName] is NullValue) {
                                         blankValue(it)
                                     } else {
@@ -405,6 +397,45 @@ open class InternalInterpreter(
         }
     }
 
+    /**
+     * Retrieves the result name associated with the current `AbstractDataDefinition` instance
+     * from the parameter list (PList) of the specified `CompilationUnit`.
+     *
+     * This function searches the PList for the first parameter where `factor1` is of type `DataRefExpr`
+     * and its variable name matches the name of the current `AbstractDataDefinition` (case-insensitively).
+     * If such a parameter is found, its associated result name is returned.
+     *
+     * @param compilationUnit the compilation unit whose entry PList is to be checked
+     * @return the result name associated with the matching parameter, or `null` if no match is found
+     */
+    private fun AbstractDataDefinition.getResultNameByFactor1(compilationUnit: CompilationUnit): String? {
+        val resultName = compilationUnit.entryPlist?.params
+            ?.filter { plistParam -> plistParam.factor1 is DataRefExpr }
+            ?.firstOrNull { plistParamFiltered ->
+                (plistParamFiltered.factor1 as DataRefExpr).variable.name.equals(
+                    this.name,
+                    true
+                )
+            }
+            ?.result?.name
+        return resultName
+    }
+
+    /**
+     * Checks if the current `AbstractDataDefinition` instance is present in the parameter list (PList)
+     * of the specified `CompilationUnit`.
+     *
+     * This function evaluates whether the `AbstractDataDefinition` matches any parameter in the PList
+     * by comparing their names (case-insensitively). Parameters in the PList are filtered to include
+     * only those with a `factor1` of type `DataRefExpr`.
+     *
+     * @param compilationUnit the compilation unit whose entry PList is to be checked
+     * @return `true` if the `AbstractDataDefinition` is present in the PList, otherwise `false`
+     */
+    private fun AbstractDataDefinition.isInPlist(compilationUnit: CompilationUnit) = compilationUnit.entryPlist?.params
+            ?.filter { plistParam -> plistParam.factor1 is DataRefExpr }
+            ?.any { plistParamFiltered -> (plistParamFiltered.factor1 as DataRefExpr).variable.name.equals(this.name, true) } == true
+
     private fun toArrayValue(compileTimeArray: CompileTimeArray, arrayType: ArrayType): Value {
         // It is not clear why the compileTimeRecordsPerLine on the array type is null
         // probably it is an error during the ast processing.