Introduce KotlinNamesValidator

It's needed to prohibit invalid kotlin identifiers in refactorings

 #EA-69048 Fixed
 #EA-69063 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/core/refactoring/KotlinNamesValidator.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * 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
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.core.refactoring
+
+import com.intellij.lang.refactoring.NamesValidator
+import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.lexer.JetKeywordToken
+import org.jetbrains.kotlin.lexer.JetTokens
+
+public class KotlinNamesValidator : NamesValidator {
+    val KEYWORD_SET = JetTokens.KEYWORDS.getTypes().filterIsInstance<JetKeywordToken>().map { it.getValue() }.toHashSet()
+
+    override fun isKeyword(name: String, project: Project?): Boolean = name in KEYWORD_SET
+    override fun isIdentifier(name: String, project: Project?): Boolean = JetNameSuggester.isIdentifier(name)
+}