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)
+}

idea/src/META-INF/plugin.xml

@@ -235,6 +235,7 @@
     <gotoSymbolContributor implementation="org.jetbrains.kotlin.idea.caches.JetGotoSymbolContributor"/>
     <gotoClassContributor implementation="org.jetbrains.kotlin.idea.caches.JetGotoClassContributor"/>
     <lang.importOptimizer language="jet" implementationClass="org.jetbrains.kotlin.idea.imports.KotlinImportOptimizer"/>
+    <lang.namesValidator language="jet" implementationClass="org.jetbrains.kotlin.idea.core.refactoring.KotlinNamesValidator"/>
 
     <fileTypeFactory implementation="org.jetbrains.kotlin.idea.JetFileFactory"/>
     <fileTypeFactory implementation="org.jetbrains.kotlin.idea.KotlinJavaScriptMetaFileTypeFactory"/>

idea/tests/org/jetbrains/kotlin/idea/refactoring/KotlinNamesValidatorTest.kt

@@ -0,0 +1,63 @@
+/*
+ * 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.refactoring
+
+import com.intellij.lang.refactoring.NamesValidator
+import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.idea.core.refactoring.KotlinNamesValidator
+import org.junit.Assert
+
+public class KotlinNamesValidatorTest : LightCodeInsightFixtureTestCase() {
+    val validator: NamesValidator = KotlinNamesValidator()
+
+    private fun isKeyword(string: String) = validator.isKeyword(string, null)
+    private fun isIdentifier(string: String) = validator.isIdentifier(string, null)
+
+    override fun setUp() {
+        super.setUp()
+        myFixture.configureByFiles()
+    }
+
+    public fun testKeywords() {
+        Assert.assertTrue(isKeyword("val"));
+        Assert.assertTrue(isKeyword("class"));
+        Assert.assertTrue(isKeyword("fun"));
+
+        Assert.assertFalse(isKeyword("constructor"));
+        Assert.assertFalse(isKeyword("123"));
+        Assert.assertFalse(isKeyword("a.c"));
+        Assert.assertFalse(isKeyword("-"));
+    }
+
+    public fun testIdentifiers() {
+        Assert.assertTrue(isIdentifier("abc"));
+        Assert.assertTrue(isIdentifier("q_q"));
+        Assert.assertTrue(isIdentifier("constructor"));
+        Assert.assertTrue(isIdentifier("`val`"));
+
+        Assert.assertFalse(isIdentifier("val"));
+        Assert.assertFalse(isIdentifier("class"));
+        Assert.assertFalse(isIdentifier("fun"));
+
+        Assert.assertFalse(isIdentifier("123"));
+        Assert.assertFalse(isIdentifier("a.c"));
+        Assert.assertFalse(isIdentifier("-"));
+        Assert.assertFalse(isIdentifier("``"));
+        Assert.assertFalse(isIdentifier(""));
+        Assert.assertFalse(isIdentifier("  '"));
+    }
+}