Add URLSearchParams's size

https://bugs.webkit.org/show_bug.cgi?id=252749
rdar://105781287

Reviewed by Darin Adler.

Add support for URLSearchParams.size:
- whatwg/url#734
- web-platform-tests/wpt#38655

* LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.html: Added.
* LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.js: Added.
(test):
* LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.worker-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.worker.html: Added.
* Source/WebCore/html/URLSearchParams.h:
(WebCore::URLSearchParams::size const):
* Source/WebCore/html/URLSearchParams.idl:

Canonical link: https://commits.webkit.org/260836@main

LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any-expected.txt

@@ -0,0 +1,6 @@
+
+PASS URLSearchParams's size and deletion
+PASS URLSearchParams's size and addition
+PASS URLSearchParams's size when obtained from a URL
+PASS URLSearchParams's size when obtained from a URL and using .search
+

LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.html

@@ -0,0 +1 @@
+<!-- This file is required for WebKit test infrastructure to run the templated test -->

LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.js

@@ -0,0 +1,34 @@
+test(() => {
+  const params = new URLSearchParams("a=1&b=2&a=3");
+  assert_equals(params.size, 3);
+
+  params.delete("a");
+  assert_equals(params.size, 1);
+}, "URLSearchParams's size and deletion");
+
+test(() => {
+  const params = new URLSearchParams("a=1&b=2&a=3");
+  assert_equals(params.size, 3);
+
+  params.append("b", "4");
+  assert_equals(params.size, 4);
+}, "URLSearchParams's size and addition");
+
+test(() => {
+  const url = new URL("http://localhost/query?a=1&b=2&a=3");
+  assert_equals(url.searchParams.size, 3);
+
+  url.searchParams.delete("a");
+  assert_equals(url.searchParams.size, 1);
+
+  url.searchParams.append("b", 4);
+  assert_equals(url.searchParams.size, 2);
+}, "URLSearchParams's size when obtained from a URL");
+
+test(() => {
+  const url = new URL("http://localhost/query?a=1&b=2&a=3");
+  assert_equals(url.searchParams.size, 3);
+
+  url.search = "?";
+  assert_equals(url.searchParams.size, 0);
+}, "URLSearchParams's size when obtained from a URL and using .search");

LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.worker-expected.txt

@@ -0,0 +1,6 @@
+
+PASS URLSearchParams's size and deletion
+PASS URLSearchParams's size and addition
+PASS URLSearchParams's size when obtained from a URL
+PASS URLSearchParams's size when obtained from a URL and using .search
+

LayoutTests/imported/w3c/web-platform-tests/url/urlsearchparams-size.any.worker.html

@@ -0,0 +1 @@
+<!-- This file is required for WebKit test infrastructure to run the templated test -->

Source/WebCore/html/URLSearchParams.h

@@ -44,6 +44,8 @@ class URLSearchParams : public RefCounted<URLSearchParams> {
         return adoptRef(*new URLSearchParams(string, associatedURL));
     }
 
+    size_t size() const { return m_pairs.size(); }
+
     void append(const String& name, const String& value);
     void remove(const String& name);
     String get(const String& name) const;

Source/WebCore/html/URLSearchParams.idl

@@ -28,6 +28,8 @@
 ] interface URLSearchParams {
     constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = "");
 
+    readonly attribute unsigned long size;
+
     undefined append(USVString name, USVString value);
     [ImplementedAs=remove] undefined delete(USVString name);
     USVString? get(USVString name);