Implement URLPattern.hasRegExpGroups.

This allows authors to tell whether a pattern contains one or more
regexp groups, which may limit the uses they're able to make of it.

Bug: 1504650
Change-Id: I07b684788e921448b60c4ffee9cfe87585a794c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5054393
Reviewed-by: Shunya Shishido <[email protected]>
Commit-Queue: Jeremy Roman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1228894}

urlpattern/resources/urlpattern-hasregexpgroups-tests.js

@@ -0,0 +1,18 @@
+test(() => {
+  assert_implements('hasRegExpGroups' in URLPattern.prototype, "hasRegExpGroups is not implemented");
+  assert_false(new URLPattern({}).hasRegExpGroups, "match-everything pattern");
+  for (let component of ['protocol', 'username', 'password', 'hostname', 'port', 'pathname', 'search', 'hash']) {
+    assert_false(new URLPattern({[component]: '*'}).hasRegExpGroups, `wildcard in ${component}`);
+    assert_false(new URLPattern({[component]: ':foo'}).hasRegExpGroups, `segment wildcard  in ${component}`);
+    assert_false(new URLPattern({[component]: ':foo?'}).hasRegExpGroups, `optional segment wildcard  in ${component}`);
+    assert_true(new URLPattern({[component]: ':foo(hi)'}).hasRegExpGroups, `named regexp group in ${component}`);
+    assert_true(new URLPattern({[component]: '(hi)'}).hasRegExpGroups, `anonymous regexp group in ${component}`);
+    if (component !== 'protocol' && component !== 'port') {
+      // These components are more narrow in what they accept in any case.
+      assert_false(new URLPattern({[component]: 'a-{:hello}-z-*-a'}).hasRegExpGroups, `wildcards mixed in with fixed text and wildcards in ${component}`);
+      assert_true(new URLPattern({[component]: 'a-(hi)-z-(lo)-a'}).hasRegExpGroups, `regexp groups mixed in with fixed text and wildcards in ${component}`);
+    }
+  }
+  assert_false(new URLPattern({pathname: '/a/:foo/:baz?/b/*'}).hasRegExpGroups, "complex pathname with no regexp");
+  assert_true(new URLPattern({pathname: '/a/:foo/:baz([a-z]+)?/b/*'}).hasRegExpGroups, "complex pathname with regexp");
+}, '');

urlpattern/urlpattern-hasregexpgroups.any.js

@@ -0,0 +1,2 @@
+// META: global=window,worker
+// META: script=resources/urlpattern-hasregexpgroups-tests.js