Find Usages: Support text-file search of Kotlin declarations

idea/src/org/jetbrains/jet/plugin/findUsages/handlers/DelegatingFindMemberUsagesHandler.kt

@@ -72,4 +72,6 @@ class DelegatingFindMemberUsagesHandler(
         }
         return handler.processElementUsages(element, processor, handlerOptions)
     }
+
+    override fun isSearchForTextOccurencesAvailable(psiElement: PsiElement, isSingleFile: Boolean): Boolean = !isSingleFile
 }

idea/src/org/jetbrains/jet/plugin/findUsages/handlers/KotlinFindClassUsagesHandler.kt

@@ -37,6 +37,10 @@ import org.jetbrains.jet.plugin.findUsages.toClassHelper
 import org.jetbrains.jet.plugin.findUsages.toClassDeclarationsHelper
 import org.jetbrains.jet.plugin.search.usagesSearch.search
 import org.jetbrains.jet.plugin.util.application.runReadAction
+import org.jetbrains.jet.asJava.namedUnwrappedElement
+import java.util.Collections
+import com.intellij.find.findUsages.JavaFindUsagesHandler
+import com.intellij.find.findUsages.JavaFindUsagesHandlerFactory
 
 public class KotlinFindClassUsagesHandler(
         jetClass: JetClassOrObject,
@@ -84,11 +88,26 @@ public class KotlinFindClassUsagesHandler(
         }
     }
 
-    protected override fun isSearchForTextOccurencesAvailable(psiElement: PsiElement, isSingleFile: Boolean): Boolean {
+    protected override fun getStringsToSearch(element: PsiElement): Collection<String> {
-        if (isSingleFile)
+        val psiClass = when (element) {
-            return false
+                           is PsiClass -> element
+                           is JetClassOrObject -> LightClassUtil.getPsiClass(getElement())
+                           else -> null
+                       } ?: return Collections.emptyList()
 
-        return psiElement is JetClassOrObject
+        // Work around the protected method in JavaFindUsagesHandler
+        // todo: Use JavaFindUsagesHelper.getElementNames() when it becomes public in IDEA
+        var stringsToSearch: Collection<String>
+        object: JavaFindUsagesHandler(psiClass, JavaFindUsagesHandlerFactory.getInstance(element.getProject())) {
+            {
+                stringsToSearch = getStringsToSearch(psiClass)
+            }
+        }
+        return stringsToSearch
+    }
+
+    protected override fun isSearchForTextOccurencesAvailable(psiElement: PsiElement, isSingleFile: Boolean): Boolean {
+        return !isSingleFile
     }
 
     public override fun getFindUsagesOptions(dataContext: DataContext?): FindUsagesOptions {

idea/testData/findUsages/kotlin/findClassUsages/classUsedInPlainText.0.kt

@@ -0,0 +1,7 @@
+// PSI_ELEMENT: org.jetbrains.jet.lang.psi.JetClass
+// OPTIONS: textOccurrences
+package test
+
+class <caret>Foo {
+
+}

idea/testData/findUsages/kotlin/findClassUsages/classUsedInPlainText.1.text

@@ -0,0 +1,2 @@
+test.Foo
+Foo

idea/testData/findUsages/kotlin/findClassUsages/classUsedInPlainText.results.txt

@@ -0,0 +1 @@
+Unclassified usage (1: 1) test.Foo

idea/testData/findUsages/kotlin/findFunctionUsages/functionUsedInPlainText.0.kt

@@ -0,0 +1,9 @@
+// PSI_ELEMENT: org.jetbrains.jet.lang.psi.JetNamedFunction
+// OPTIONS: textOccurrences
+package test
+
+class Foo {
+    fun <caret>foo() {
+
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/functionUsedInPlainText.1.text

@@ -0,0 +1 @@
+Function foo is defined in class Foo

idea/testData/findUsages/kotlin/findFunctionUsages/functionUsedInPlainText.results.txt

@@ -0,0 +1 @@
+Unclassified usage (1: 10) Function foo is defined in class Foo

idea/tests/org/jetbrains/jet/findUsages/AbstractJetFindUsagesTest.java

@@ -231,6 +231,11 @@ public abstract class AbstractJetFindUsagesTest extends JetLightCodeInsightFixtu
                 return true;
             }
 
+            else if (s.equals("textOccurrences")) {
+                options.isSearchForTextOccurrences = true;
+                return true;
+            }
+
             return false;
         }
 
@@ -304,7 +309,7 @@ public abstract class AbstractJetFindUsagesTest extends JetLightCodeInsightFixtu
                         if (!name.startsWith(prefix) || name.equals(mainFileName)) return false;
 
                         String ext = name.substring(name.lastIndexOf('.') + 1);
-                        return ext.equals("kt") || ext.equals("java") || ext.equals("xml");
+                        return ext.equals("kt") || ext.equals("java") || ext.equals("xml") || ext.equals("text");
                     }
                 }
         );

idea/tests/org/jetbrains/jet/findUsages/JetFindUsagesTestGenerated.java

@@ -141,6 +141,12 @@ public class JetFindUsagesTestGenerated extends AbstractJetFindUsagesTest {
                 JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/findUsages/kotlin/findClassUsages"), Pattern.compile("^(.+)\\.0\\.kt$"), true);
             }
 
+            @TestMetadata("classUsedInPlainText.0.kt")
+            public void testClassUsedInPlainText() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findClassUsages/classUsedInPlainText.0.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("classUsedInTextAsRef.0.kt")
             public void testClassUsedInTextAsRef() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findClassUsages/classUsedInTextAsRef.0.kt");
@@ -456,6 +462,12 @@ public class JetFindUsagesTestGenerated extends AbstractJetFindUsagesTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("functionUsedInPlainText.0.kt")
+            public void testFunctionUsedInPlainText() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/functionUsedInPlainText.0.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("javaAndKotlinOverrides.0.kt")
             public void testJavaAndKotlinOverrides() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findFunctionUsages/javaAndKotlinOverrides.0.kt");