From 881e9d1341a38dc81996a549fd37bd3871078416 Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Wed, 29 Sep 2021 13:03:09 +0100
Subject: [PATCH] LibWeb: Make StyleSheetList.item an IDL getter

---
 .../Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp  |  1 +
 Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp      | 11 +++++++++++
 Userland/Libraries/LibWeb/CSS/StyleSheetList.h        |  2 ++
 Userland/Libraries/LibWeb/CSS/StyleSheetList.idl      |  4 ++--
 4 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp
index 9b21e63fee..21c074b0f5 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp
@@ -1460,6 +1460,7 @@ void generate_implementation(IDL::Interface const& interface)
 #include <LibJS/Runtime/Value.h>
 #include <LibWeb/Bindings/@prototype_class@.h>
 #include <LibWeb/Bindings/@wrapper_class@.h>
+#include <LibWeb/Bindings/CSSStyleSheetWrapper.h>
 #include <LibWeb/Bindings/CanvasRenderingContext2DWrapper.h>
 #include <LibWeb/Bindings/CommentWrapper.h>
 #include <LibWeb/Bindings/DOMImplementationWrapper.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp b/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp
index 42e365df20..8337be16c3 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp
@@ -18,4 +18,15 @@ StyleSheetList::StyleSheetList(DOM::Document& document)
 {
 }
 
+// https://drafts.csswg.org/cssom/#ref-for-dfn-supported-property-indices%E2%91%A1
+bool StyleSheetList::is_supported_property_index(u32 index) const
+{
+    // The object’s supported property indices are the numbers in the range zero to one less than the number of CSS style sheets represented by the collection.
+    // If there are no such CSS style sheets, then there are no supported property indices.
+    if (m_sheets.is_empty())
+        return false;
+
+    return index < m_sheets.size();
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/CSS/StyleSheetList.h b/Userland/Libraries/LibWeb/CSS/StyleSheetList.h
index 5b52008f3a..04ccf51ebb 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleSheetList.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleSheetList.h
@@ -37,6 +37,8 @@ public:
 
     size_t length() const { return m_sheets.size(); }
 
+    bool is_supported_property_index(u32) const;
+
 private:
     explicit StyleSheetList(DOM::Document&);
 
diff --git a/Userland/Libraries/LibWeb/CSS/StyleSheetList.idl b/Userland/Libraries/LibWeb/CSS/StyleSheetList.idl
index 27460affa4..15dc0d41f6 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleSheetList.idl
+++ b/Userland/Libraries/LibWeb/CSS/StyleSheetList.idl
@@ -1,5 +1,5 @@
+[Exposed=Window]
 interface StyleSheetList {
-    // FIXME: item() should be a WebIDL "getter"
-    CSSStyleSheet? item(unsigned long index);
+    getter CSSStyleSheet? item(unsigned long index);
     readonly attribute unsigned long length;
 };