KT-4016 Support "Copy Reference" action on class, method, etc

#KT-4016 fixed

idea/src/META-INF/plugin.xml

@@ -261,6 +261,8 @@
                          displayName="Kotlin Compiler"
                          parentId="project.propCompiler"/>
 
+    <qualifiedNameProvider implementation="org.jetbrains.jet.plugin.actions.KotlinQualifiedNameProvider"/>
+
     <codeInsight.parameterInfo language="jet" implementationClass="org.jetbrains.jet.plugin.parameterInfo.JetFunctionParameterInfoHandler"/>
 
     <codeInsight.gotoSuper language="jet" implementationClass="org.jetbrains.jet.plugin.codeInsight.GotoSuperActionHandler"/>

idea/src/org/jetbrains/jet/plugin/actions/KotlinQualifiedNameProvider.kt

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2010-2014 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.jet.plugin.actions
+
+import com.intellij.ide.actions.QualifiedNameProvider
+import com.intellij.psi.PsiElement
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.editor.Editor
+import org.jetbrains.jet.lang.psi.JetProperty
+import org.jetbrains.jet.lang.psi.JetNamedFunction
+import org.jetbrains.jet.lang.psi.JetDeclaration
+import org.jetbrains.jet.plugin.caches.resolve.resolveToDescriptor
+import org.jetbrains.jet.lang.resolve.DescriptorUtils
+import org.jetbrains.jet.lang.psi.JetClassOrObject
+
+public class KotlinQualifiedNameProvider: QualifiedNameProvider {
+    override fun adjustElementToCopy(element: PsiElement?) = null
+
+    override fun getQualifiedName(element: PsiElement?): String? {
+        when (element) {
+            is JetClassOrObject -> return element.getFqName()?.asString()
+            is JetNamedFunction, is JetProperty -> {
+                val descriptor = (element as JetDeclaration).resolveToDescriptor()
+                val fqNameUnsafe = DescriptorUtils.getFqName(descriptor)
+                if (fqNameUnsafe.isSafe()) {
+                    return fqNameUnsafe.asString()
+                }
+            }
+        }
+        return null
+    }
+
+    override fun qualifiedNameToElement(fqn: String?, project: Project?) = null
+
+    override fun insertQualifiedName(fqn: String?, element: PsiElement?, editor: Editor?, project: Project?) {
+    }
+}

idea/tests/org/jetbrains/jet/plugin/actions/QualifiedNamesTest.kt

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2010-2014 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.jet.plugin.actions
+
+import com.intellij.testFramework.LightCodeInsightTestCase
+import com.intellij.testFramework.LightPlatformCodeInsightTestCase
+import org.jetbrains.jet.lang.psi.JetVisitorVoid
+import com.intellij.psi.PsiElement
+import org.jetbrains.jet.lang.psi.JetClass
+import org.jetbrains.jet.lang.psi.JetObjectDeclaration
+import com.intellij.ide.actions.CopyReferenceAction
+import org.jetbrains.jet.lang.psi.JetNamedDeclaration
+import java.util.ArrayList
+import kotlin.test.assertEquals
+
+public class QualifiedNamesTest: LightCodeInsightTestCase() {
+    fun testClassRef() {
+        LightPlatformCodeInsightTestCase.configureFromFileText(
+                "class.kt",
+                """
+                    package foo.bar
+
+                    class Klass {
+                        class Nested
+
+                        class object {
+                        }
+                    }
+
+                    object Object {
+                    }
+
+                    val anonymous = object {
+                    }
+                """
+        )
+        assertEquals(listOf("foo.bar.Klass", "foo.bar.Klass.Nested", null, "foo.bar.Object", "foo.bar.anonymous", null),
+                     getQualifiedNamesForDeclarations())
+    }
+
+    fun testFunRef() {
+        LightPlatformCodeInsightTestCase.configureFromFileText(
+                "fun.kt",
+                """
+                    package foo.bar
+
+                    class Klass {
+                        fun memberFun() {
+                        }
+
+                        val memberVal = ":)"
+                    }
+
+                    fun topLevelFun()
+
+                    val topLevelVal = ":)"
+                """
+        )
+        assertEquals(listOf("foo.bar.Klass", "foo.bar.Klass.memberFun", "foo.bar.Klass.memberVal", "foo.bar.topLevelFun", "foo.bar.topLevelVal"),
+                     getQualifiedNamesForDeclarations())
+    }
+
+    private fun getQualifiedNamesForDeclarations(): List<String?> {
+        val result = ArrayList<String?>()
+        LightPlatformCodeInsightTestCase.myFile.accept(object : JetVisitorVoid() {
+            override fun visitElement(element: PsiElement) {
+                element.acceptChildren(this)
+            }
+
+            override fun visitNamedDeclaration(declaration: JetNamedDeclaration) {
+                result.add(CopyReferenceAction.elementToFqn(declaration))
+                super.visitNamedDeclaration(declaration)
+            }
+        })
+        return result
+    }
+}