From b1e43c9ea1a2dde97a2e0fdd02895337bcc55a7e Mon Sep 17 00:00:00 2001
From: networkException <git@nwex.de>
Date: Tue, 11 Apr 2023 14:57:34 +0200
Subject: [PATCH] LibWeb: Implement URL.canParse(url, base)

This patch adds an implementation of the URL.canParse(url, base) static
function :^)
---
 Userland/Libraries/LibWeb/URL/URL.cpp | 14 ++++++++++++++
 Userland/Libraries/LibWeb/URL/URL.h   |  3 +++
 Userland/Libraries/LibWeb/URL/URL.idl |  2 ++
 3 files changed, 19 insertions(+)

diff --git a/Userland/Libraries/LibWeb/URL/URL.cpp b/Userland/Libraries/LibWeb/URL/URL.cpp
index 14ff13894d..8771b9534f 100644
--- a/Userland/Libraries/LibWeb/URL/URL.cpp
+++ b/Userland/Libraries/LibWeb/URL/URL.cpp
@@ -96,6 +96,20 @@ void URL::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_query.ptr());
 }
 
+// https://url.spec.whatwg.org/#dom-url-canparse
+bool URL::can_parse(JS::VM&, String const& url, Optional<String> const& base)
+{
+    // 1. Let parsedURL be the result of running the API URL parser on url with base, if given.
+    auto parsed_url = parse_api_url(url, base);
+
+    // 2. If parsedURL is failure, then return false.
+    if (!parsed_url.has_value())
+        return false;
+
+    // 3. Return true.
+    return true;
+}
+
 WebIDL::ExceptionOr<String> URL::href() const
 {
     auto& vm = realm().vm();
diff --git a/Userland/Libraries/LibWeb/URL/URL.h b/Userland/Libraries/LibWeb/URL/URL.h
index 449d55ff86..f723308eb2 100644
--- a/Userland/Libraries/LibWeb/URL/URL.h
+++ b/Userland/Libraries/LibWeb/URL/URL.h
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
  * Copyright (c) 2021, the SerenityOS developers.
+ * Copyright (c) 2023, networkException <networkexception@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -23,6 +24,8 @@ public:
 
     virtual ~URL() override;
 
+    static bool can_parse(JS::VM&, String const& url, Optional<String> const& base = {});
+
     WebIDL::ExceptionOr<String> href() const;
     WebIDL::ExceptionOr<void> set_href(String const&);
 
diff --git a/Userland/Libraries/LibWeb/URL/URL.idl b/Userland/Libraries/LibWeb/URL/URL.idl
index d149a998e9..702e551c1a 100644
--- a/Userland/Libraries/LibWeb/URL/URL.idl
+++ b/Userland/Libraries/LibWeb/URL/URL.idl
@@ -5,6 +5,8 @@
 interface URL {
     constructor(USVString url, optional USVString base);
 
+    static boolean canParse(USVString url, optional USVString base);
+
     stringifier attribute USVString href;
     readonly attribute USVString origin;
     attribute USVString protocol;