Add #[AsTwigComponent] attribute completion for Twig component classes

src/main/java/fr/adrienbrault/idea/symfony2plugin/completion/PhpAttributeCompletionContributor.java

@@ -17,6 +17,8 @@
 import fr.adrienbrault.idea.symfony2plugin.Symfony2Icons;
 import fr.adrienbrault.idea.symfony2plugin.Symfony2ProjectComponent;
 import fr.adrienbrault.idea.symfony2plugin.intentions.php.AddRouteAttributeIntention;
+import fr.adrienbrault.idea.symfony2plugin.stubs.indexes.UxTemplateStubIndex;
+import fr.adrienbrault.idea.symfony2plugin.stubs.util.IndexUtil;
 import fr.adrienbrault.idea.symfony2plugin.util.CodeUtil;
 import fr.adrienbrault.idea.symfony2plugin.util.PhpElementsUtil;
 import org.apache.commons.lang3.StringUtils;
@@ -31,7 +33,7 @@
  * Triggers when typing "#<caret>" before a public method or class
  *
  * Supports:
- * - Class-level attributes: #[Route], #[AsController], #[IsGranted]
+ * - Class-level attributes: #[Route], #[AsController], #[IsGranted], #[AsTwigComponent]
  * - Method-level attributes: #[Route], #[IsGranted], #[Cache]
  * - Twig extension attributes: #[AsTwigFilter], #[AsTwigFunction], #[AsTwigTest]
  *
@@ -46,6 +48,7 @@ public class PhpAttributeCompletionContributor extends CompletionContributor {
     private static final String AS_TWIG_FILTER_ATTRIBUTE_FQN = "\\Twig\\Attribute\\AsTwigFilter";
     private static final String AS_TWIG_FUNCTION_ATTRIBUTE_FQN = "\\Twig\\Attribute\\AsTwigFunction";
     private static final String AS_TWIG_TEST_ATTRIBUTE_FQN = "\\Twig\\Attribute\\AsTwigTest";
+    private static final String AS_TWIG_COMPONENT_ATTRIBUTE_FQN = "\\Symfony\\UX\\TwigComponent\\Attribute\\AsTwigComponent";
     private static final String TWIG_EXTENSION_FQN = "\\Twig\\Extension\\AbstractExtension";
 
     public PhpAttributeCompletionContributor() {
@@ -95,6 +98,10 @@ protected void addCompletions(@NotNull CompletionParameters parameters, @NotNull
                     if (AddRouteAttributeIntention.isControllerClass(phpClass)) {
                         lookupElements.addAll(getControllerClassCompletions(project));
                     }
+
+                    if (isTwigComponentClass(project, phpClass)) {
+                        lookupElements.addAll(getTwigComponentClassCompletions(project));
+                    }
                 }
             }
 
@@ -237,6 +244,75 @@ private Collection<LookupElement> getTwigExtensionCompletions(@NotNull Project p
             return lookupElements;
         }
 
+        /**
+         * Get Twig component class-level attribute completions (for component classes)
+         */
+        private Collection<LookupElement> getTwigComponentClassCompletions(@NotNull Project project) {
+            Collection<LookupElement> lookupElements = new ArrayList<>();
+
+            // Add AsTwigComponent attribute completion
+            if (PhpElementsUtil.hasClassOrInterface(project, AS_TWIG_COMPONENT_ATTRIBUTE_FQN)) {
+                LookupElement lookupElement = LookupElementBuilder
+                    .create("#[AsTwigComponent]")
+                    .withIcon(Symfony2Icons.SYMFONY_ATTRIBUTE)
+                    .withTypeText(StringUtils.stripStart(AS_TWIG_COMPONENT_ATTRIBUTE_FQN, "\\"), true)
+                    .withInsertHandler(new PhpAttributeInsertHandler(AS_TWIG_COMPONENT_ATTRIBUTE_FQN, CursorPosition.INSIDE_QUOTES))
+                    .bold();
+
+                lookupElements.add(lookupElement);
+            }
+
+            return lookupElements;
+        }
+
+        /**
+         * Check if the class is a Twig component class.
+         * A class is considered a Twig component if:
+         * - Its namespace contains "\\Components\\" or ends with "\\Components", OR
+         * - There are existing component classes (from index) in the same namespace
+         * (e.g., App\Twig\Components\Button, Foo\Components\Form\Input)
+         */
+        private boolean isTwigComponentClass(@NotNull Project project, @NotNull PhpClass phpClass) {
+            String fqn = phpClass.getFQN();
+            if (fqn.isBlank()) {
+                return false;
+            }
+
+            fqn = StringUtils.stripStart(fqn, "\\");
+
+            int lastBackslash = fqn.lastIndexOf('\\');
+            if (lastBackslash == -1) {
+                return false; // No namespace
+            }
+
+            String namespace = fqn.substring(0, lastBackslash);
+            if (namespace.contains("\\Components\\") ||
+                namespace.endsWith("\\Components") ||
+                namespace.equals("Components")) {
+                return true;
+            }
+
+            // Check if there are any component classes in the same namespace from the index
+            //  keys are FQN class names of components with #[AsTwigComponent] attribute
+            for (String key : IndexUtil.getAllKeysForProject(UxTemplateStubIndex.KEY, project)) {
+                String componentFqn = StringUtils.stripStart(key, "\\");
+
+                // Extract namespace from the component FQN
+                int componentLastBackslash = componentFqn.lastIndexOf('\\');
+                if (componentLastBackslash == -1) {
+                    continue;
+                }
+
+                // Check if the current class's namespace matches the component namespace
+                String componentNamespace = componentFqn.substring(0, componentLastBackslash);
+                if (namespace.equals(componentNamespace)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         /**
          * Check if the class is a TwigExtension class.
          * A class is considered a TwigExtension if:

src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/completion/PhpAttributeCompletionContributorTest.java

@@ -424,4 +424,60 @@ public void testClassLevelCompletionWithMultipleExistingAttributes() {
             "#[Route]", "#[AsController]"
         );
     }
+
+    // ===============================
+    // AsTwigComponent attribute tests
+    // ===============================
+
+    public void testAsTwigComponentAttributeCompletionForComponentClass() {
+        // Test that AsTwigComponent attribute appears for classes in Components namespace
+        assertCompletionContains(PhpFileType.INSTANCE,
+            "<?php\n\nnamespace App\\Twig\\Components;\n\n#<caret>\nclass Button {\n}",
+            "#[AsTwigComponent]"
+        );
+    }
+
+    public void testAsTwigComponentAttributeCompletionForNestedComponentClass() {
+        // Test that AsTwigComponent attribute appears for classes in nested Components namespace
+        assertCompletionContains(PhpFileType.INSTANCE,
+            "<?php\n\nnamespace Foo\\Components\\Form;\n\n#<caret>\nclass Input {\n}",
+            "#[AsTwigComponent]"
+        );
+    }
+
+    public void testNoAsTwigComponentForNonComponentClass() {
+        // Test that AsTwigComponent attribute does not appear for non-component classes
+        assertCompletionNotContains(PhpFileType.INSTANCE,
+            "<?php\n\nnamespace App\\Service;\n\n#<caret>\nclass MyService {\n}",
+            "#[AsTwigComponent]"
+        );
+    }
+
+    public void testNoAsTwigComponentAtMethodLevel() {
+        // Test that AsTwigComponent is NOT available at method level (class-only)
+        assertCompletionNotContains(PhpFileType.INSTANCE,
+            "<?php\n\nnamespace App\\Twig\\Components;\n\nclass Button {\n    #<caret>\n    public function render() { }\n}",
+            "#[AsTwigComponent]"
+        );
+    }
+
+    public void testAsTwigComponentAttributeCompletionForClassInSameNamespaceAsIndexedComponent() {
+        // Test that AsTwigComponent attribute appears for classes in the same namespace as an existing indexed component
+        // First, add a component class with the attribute to the project (this will be indexed)
+        myFixture.addFileToProject("ExistingWidget.php",
+            "<?php\n\n" +
+                "namespace App\\Custom\\Widgets;\n\n" +
+                "use Symfony\\UX\\TwigComponent\\Attribute\\AsTwigComponent;\n\n" +
+                "#[AsTwigComponent('existing_widget')]\n" +
+                "class ExistingWidget {\n" +
+                "}"
+        );
+
+        // Now check that a new class in the same namespace gets the completion
+        // (namespace doesn't contain "Components", so it should work only because of the index)
+        assertCompletionContains(PhpFileType.INSTANCE,
+            "<?php\n\nnamespace App\\Custom\\Widgets;\n\n#<caret>\nclass NewWidget {\n}",
+            "#[AsTwigComponent]"
+        );
+    }
 }

src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/completion/fixtures/classes.php

@@ -86,4 +86,10 @@ class AsTwigFunction
     class AsTwigTest
     {
     }
+}
+
+namespace Symfony\UX\TwigComponent\Attribute {
+    class AsTwigComponent
+    {
+    }
 }