Fixed WRONG_MULTIPLE_MODIFIERS_ORDER bug in SAM interface

diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/MultipleModifiersSequence.kt

@@ -5,11 +5,13 @@ import org.cqfn.diktat.ruleset.constants.Warnings.WRONG_MULTIPLE_MODIFIERS_ORDER
 import org.cqfn.diktat.ruleset.rules.DiktatRule
 
 import com.pinterest.ktlint.core.ast.ElementType.ANNOTATION_ENTRY
+import com.pinterest.ktlint.core.ast.ElementType.FUN_KEYWORD
 import com.pinterest.ktlint.core.ast.ElementType.MODIFIER_LIST
 import com.pinterest.ktlint.core.ast.ElementType.WHITE_SPACE
 import org.jetbrains.kotlin.com.intellij.lang.ASTNode
 import org.jetbrains.kotlin.com.intellij.psi.impl.source.tree.PsiWhiteSpaceImpl
 import org.jetbrains.kotlin.lexer.KtTokens
+import org.jetbrains.kotlin.psi.KtClass
 import org.jetbrains.kotlin.psi.psiUtil.children
 
 /**
@@ -31,6 +33,9 @@ class MultipleModifiersSequence(configRules: List<RulesConfig>) : DiktatRule(
         val modifierListOfPair = node
             .getChildren(KtTokens.MODIFIER_KEYWORDS)
             .toList()
+            .filter {
+                !isSamInterfaces(node, it)
+            }
             .map { Pair(it, modifierOrder.indexOf(it.elementType)) }
         val sortModifierListOfPair = modifierListOfPair.sortedBy { it.second }.map { it.first }
         modifierListOfPair.forEachIndexed { index, (modifierNode, _) ->
@@ -46,6 +51,15 @@ class MultipleModifiersSequence(configRules: List<RulesConfig>) : DiktatRule(
         }
     }
 
+    private fun isSamInterfaces(parent: ASTNode, node: ASTNode): Boolean {
+        val parentPsi = parent.treeParent.psi
+        return if (parentPsi is KtClass) {
+            (parentPsi.isInterface()) && node.elementType == FUN_KEYWORD
+        } else {
+            false
+        }
+    }
+
     private fun checkAnnotation(node: ASTNode) {
         val firstModifierIndex = node
             .children()

diktat-rules/src/test/kotlin/org/cqfn/diktat/ruleset/chapter2/HeaderCommentRuleTest.kt

@@ -221,7 +221,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                 * Copyright (c) 2022 My Company, Ltd. All rights reserved.
+                 * Copyright (c) 2023 My Company, Ltd. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes
@@ -244,7 +244,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                 * Copyright (c) My Company, Ltd. 2012-2022. All rights reserved.
+                 * Copyright (c) My Company, Ltd. 2012-2023. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes
@@ -267,7 +267,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                   Copyright (c) My Company, Ltd. 2021-2022. All rights reserved.
+                   Copyright (c) My Company, Ltd. 2021-2023. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes
@@ -290,7 +290,7 @@ class HeaderCommentRuleTest : LintTestBase(::HeaderCommentRule) {
         lintMethod(
             """
                 /*
-                 *  Copyright (c) My Company, Ltd. 2002-2022. All rights reserved.
+                 *  Copyright (c) My Company, Ltd. 2002-2023. All rights reserved.
                  */
                 /**
                  * Very useful description, why this file has two classes

diktat-rules/src/test/resources/test/paragraph3/multiple_modifiers/ModifierExpected.kt

@@ -11,3 +11,7 @@ protected data class Counter(val dayIndex: Int) {
 public final fun foo() {
     protected open lateinit var a: List<ASTNode>
 }
+
+public internal fun interface Factory {
+    public fun create(): List<Int>
+}

diktat-rules/src/test/resources/test/paragraph3/multiple_modifiers/ModifierTest.kt

@@ -11,3 +11,7 @@ data protected class Counter(val dayIndex: Int) {
 final public fun foo() {
     lateinit open protected var a: List<ASTNode>
 }
+
+internal public fun interface Factory {
+    public fun create(): List<Int>
+}

diktat-ruleset/src/test/resources/test/smoke/src/main/kotlin/Example5Expected.kt

@@ -1,6 +1,6 @@
 // ;warn:$line:1: [FILE_NAME_MATCH_CLASS] file name is incorrect - it should match with the class described in it if there is the only one class declared: Example5Expected.kt vs Some{{.*}}
 /*
-    Copyright 2018-2022 John Doe.
+    Copyright 2018-2023 John Doe.
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at