[kotlin] k2 unused symbol: process text search for class names faster

KTIJ-33981

GitOrigin-RevId: 27808734a7e5aa93520be13f6a16fb70c9474df2

plugins/kotlin/code-insight/inspections-k2/tests/test/org/jetbrains/kotlin/idea/k2/inspections/tests/K2UnusedSymbolHighlightingTestGenerated.java

@@ -152,6 +152,11 @@ public abstract class K2UnusedSymbolHighlightingTestGenerated extends AbstractK2
         public void testSecondaryConstructorUnused() throws Exception {
             runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/multifile/secondaryConstructorUnused.kt");
         }
+
+        @TestMetadata("textUsagesClass.kt")
+        public void testTextUsagesClass() throws Exception {
+            runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/multifile/textUsagesClass.kt");
+        }
     }
 
     @RunWith(JUnit3RunnerWithInners.class)
@@ -647,6 +652,11 @@ public abstract class K2UnusedSymbolHighlightingTestGenerated extends AbstractK2
             runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/suppressedClass.kt");
         }
 
+        @TestMetadata("textUsages.kt")
+        public void testTextUsages() throws Exception {
+            runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/textUsages.kt");
+        }
+
         @TestMetadata("typeAlias.kt")
         public void testTypeAlias() throws Exception {
             runTest("../../../idea/tests/testData/inspectionsLocal/unusedSymbol/typeAlias.kt");

plugins/kotlin/highlighting/highlighting-k2/src/org/jetbrains/kotlin/idea/highlighting/K2UnusedSymbolUtil.kt

@@ -415,10 +415,31 @@ object K2UnusedSymbolUtil {
 
         val handler = (FindManager.getInstance(project) as FindManagerImpl).findUsagesManager.getFindUsagesHandler(declaration, true)
         if (handler != null) {
+
+            fun classOrObjectHasTextUsages(classOrObject: KtClassOrObject): Boolean {
+                var hasTextUsages = false
+
+                // Finding text usages
+                if (classOrObject.useScope is GlobalSearchScope) {
+                    handler.processUsagesInText(
+                        classOrObject,
+                        { hasTextUsages = true; false },
+                        GlobalSearchScope.projectScope(classOrObject.project)
+                    )
+                }
+
+                return hasTextUsages
+            }
+
+            if (declaration is KtClassOrObject && classOrObjectHasTextUsages(declaration)) return true
+
+            val options = handler.findUsagesOptions
+            // effectively disable search for text occurrences for classes which are processed earlier but faster
+            options.isSearchForTextOccurrences = false
             val result = handler.processElementUsages(declaration, Processor {
                 val refElement = it.element
                 refElement == null || checkReference(refElement, declaration, originalDeclaration)
-            }, handler.findUsagesOptions)
+            }, options)
             if (!result) {
                 return true
             }

plugins/kotlin/idea/tests/test/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -17720,6 +17720,11 @@ public abstract class LocalInspectionTestGenerated extends AbstractLocalInspecti
             public void testSecondaryConstructorUnused() throws Exception {
                 runTest("testData/inspectionsLocal/unusedSymbol/multifile/secondaryConstructorUnused.kt");
             }
+
+            @TestMetadata("textUsagesClass.kt")
+            public void testTextUsagesClass() throws Exception {
+                runTest("testData/inspectionsLocal/unusedSymbol/multifile/textUsagesClass.kt");
+            }
         }
 
         @RunWith(JUnit3RunnerWithInners.class)
@@ -18215,6 +18220,11 @@ public abstract class LocalInspectionTestGenerated extends AbstractLocalInspecti
                 runTest("testData/inspectionsLocal/unusedSymbol/suppressedClass.kt");
             }
 
+            @TestMetadata("textUsages.kt")
+            public void testTextUsages() throws Exception {
+                runTest("testData/inspectionsLocal/unusedSymbol/textUsages.kt");
+            }
+
             @TestMetadata("typeAlias.kt")
             public void testTypeAlias() throws Exception {
                 runTest("testData/inspectionsLocal/unusedSymbol/typeAlias.kt");

plugins/kotlin/idea/tests/testData/inspectionsLocal/unusedSymbol/multifile/textUsagesClass.1.txt

@@ -0,0 +1 @@
+use ABC sometimes

plugins/kotlin/idea/tests/testData/inspectionsLocal/unusedSymbol/multifile/textUsagesClass.kt

@@ -0,0 +1,2 @@
+// PROBLEM: none
+class AB<caret>C

plugins/kotlin/idea/tests/testData/inspectionsLocal/unusedSymbol/textUsages.kt

@@ -0,0 +1,8 @@
+class ABC {
+    internal fun f<caret>oo() {}
+    // use foo sometimes
+}
+
+fun main() {
+    ABC()
+}

plugins/kotlin/idea/tests/testData/inspectionsLocal/unusedSymbol/textUsages.kt.after

@@ -0,0 +1,7 @@
+class ABC {
+    // use foo sometimes
+}
+
+fun main() {
+    ABC()
+}