From 570dcbaa3396cba0c092511c25f3caf7e752a103 Mon Sep 17 00:00:00 2001
From: Shannon Booth <shannon@serenityos.org>
Date: Tue, 18 Mar 2025 19:45:08 +1300
Subject: [PATCH] LibURL/Pattern: Implement generating a component match result

---
 Libraries/LibURL/Pattern/Component.cpp | 37 ++++++++++++++++++++++++++
 Libraries/LibURL/Pattern/Component.h   | 12 +++++++--
 Libraries/LibURL/Pattern/Pattern.h     | 22 ++++++---------
 3 files changed, 55 insertions(+), 16 deletions(-)

diff --git a/Libraries/LibURL/Pattern/Component.cpp b/Libraries/LibURL/Pattern/Component.cpp
index 1079af1a18d..2c857975d74 100644
--- a/Libraries/LibURL/Pattern/Component.cpp
+++ b/Libraries/LibURL/Pattern/Component.cpp
@@ -273,4 +273,41 @@ PatternErrorOr<Component> Component::compile(Utf8View const& input, PatternParse
     };
 }
 
+// https://urlpattern.spec.whatwg.org/#create-a-component-match-result
+Component::Result Component::create_match_result(String const& input, regex::RegexResult const& exec_result) const
+{
+    // 1. Let result be a new URLPatternComponentResult.
+    Component::Result result;
+
+    // 2. Set result["input"] to input.
+    result.input = input;
+
+    // 3. Let groups be a record<USVString, (USVString or undefined)>.
+    OrderedHashMap<String, Variant<String, Empty>> groups;
+
+    // 4. Let index be 1.
+    // 5. While index is less than Get(execResult, "length"):
+    for (size_t index = 1; index <= exec_result.n_capture_groups; ++index) {
+        auto const& capture = exec_result.capture_group_matches[0][index];
+
+        // 1. Let name be component’s group name list[index − 1].
+        auto name = group_name_list[index - 1];
+
+        // 2. Let value be Get(execResult, ToString(index)).
+        // 3. Set groups[name] to value.
+        if (capture.view.is_null())
+            groups.set(name, Empty {});
+        else
+            groups.set(name, MUST(capture.view.to_string()));
+
+        // 4. Increment index by 1.
+    }
+
+    // 6. Set result["groups"] to groups.
+    result.groups = move(groups);
+
+    // 7. Return result.
+    return result;
+}
+
 }
diff --git a/Libraries/LibURL/Pattern/Component.h b/Libraries/LibURL/Pattern/Component.h
index 9ac77ff36e8..ae4edf688cd 100644
--- a/Libraries/LibURL/Pattern/Component.h
+++ b/Libraries/LibURL/Pattern/Component.h
@@ -15,6 +15,16 @@ namespace URL::Pattern {
 
 // https://urlpattern.spec.whatwg.org/#component
 struct Component {
+    static PatternErrorOr<Component> compile(Utf8View const& input, PatternParser::EncodingCallback, Options const&);
+
+    // https://urlpattern.spec.whatwg.org/#dictdef-urlpatterncomponentresult
+    struct Result {
+        String input;
+        OrderedHashMap<String, Variant<String, Empty>> groups;
+    };
+
+    Result create_match_result(String const& input, regex::RegexResult const& exec_result) const;
+
     // https://urlpattern.spec.whatwg.org/#component-pattern-string
     // pattern string, a well formed pattern string
     String pattern_string;
@@ -30,8 +40,6 @@ struct Component {
     // https://urlpattern.spec.whatwg.org/#component-has-regexp-groups
     // has regexp groups, a boolean
     bool has_regexp_groups {};
-
-    static PatternErrorOr<Component> compile(Utf8View const& input, PatternParser::EncodingCallback, Options const&);
 };
 
 bool protocol_component_matches_a_special_scheme(Component const& protocol_component);
diff --git a/Libraries/LibURL/Pattern/Pattern.h b/Libraries/LibURL/Pattern/Pattern.h
index e2b1bb59ea6..40d7f6db0cc 100644
--- a/Libraries/LibURL/Pattern/Pattern.h
+++ b/Libraries/LibURL/Pattern/Pattern.h
@@ -19,24 +19,18 @@ namespace URL::Pattern {
 // https://urlpattern.spec.whatwg.org/#typedefdef-urlpatterninput
 using Input = Variant<String, Init>;
 
-// https://urlpattern.spec.whatwg.org/#dictdef-urlpatterncomponentresult
-struct ComponentResult {
-    String input;
-    OrderedHashMap<String, Variant<String, Empty>> groups;
-};
-
 // https://urlpattern.spec.whatwg.org/#dictdef-urlpatternresult
 struct Result {
     Vector<Input> inputs;
 
-    ComponentResult protocol;
-    ComponentResult username;
-    ComponentResult password;
-    ComponentResult hostname;
-    ComponentResult port;
-    ComponentResult pathname;
-    ComponentResult search;
-    ComponentResult hash;
+    Component::Result protocol;
+    Component::Result username;
+    Component::Result password;
+    Component::Result hostname;
+    Component::Result port;
+    Component::Result pathname;
+    Component::Result search;
+    Component::Result hash;
 };
 
 // https://urlpattern.spec.whatwg.org/#dictdef-urlpatternoptions