feat: add ada_copy c function

Co-authored-by: Steve Klabnik <steve@steveklabnik.com>

include/ada_c.h

@@ -51,6 +51,7 @@ bool ada_can_parse_with_base(const char* input, size_t input_length,
 
 void ada_free(ada_url result);
 void ada_free_owned_string(ada_owned_string owned);
+ada_url ada_copy(ada_url input);
 
 bool ada_is_valid(ada_url result);
 

src/ada_c.cpp

@@ -88,6 +88,11 @@ void ada_free(ada_url result) noexcept {
   delete r;
 }
 
+ada_url ada_copy(ada_url input) noexcept {
+  ada::result<ada::url_aggregator>& r = get_instance(input);
+  return new ada::result<ada::url_aggregator>(r);
+}
+
 bool ada_is_valid(ada_url result) noexcept {
   ada::result<ada::url_aggregator>& r = get_instance(result);
   return r.has_value();

tests/ada_c.cpp

@@ -138,6 +138,23 @@ TEST(ada_c, ada_url_components) {
   SUCCEED();
 }
 
+TEST(ada_c, ada_copy) {
+  std::string lemire_blog = "https://lemire.me";
+  std::string anonrig_blog = "https://yagiz.co";
+  ada_url first = ada_parse(lemire_blog.data(), lemire_blog.length());
+  ada_url second = ada_copy(first);
+
+  ASSERT_TRUE(ada_set_href(second, anonrig_blog.data(), anonrig_blog.size()));
+
+  ASSERT_EQ(convert_string(ada_get_href(first)), "https://lemire.me/");
+  ASSERT_EQ(convert_string(ada_get_href(second)), "https://yagiz.co/");
+
+  ada_free(first);
+  ada_free(second);
+
+  SUCCEED();
+}
+
 TEST(ada_c, ada_idna) {
   std::string_view ascii_input = "straße.de";
   std::string_view unicode_input = "xn--strae-oqa.de";