LibURL/Pattern: Add a URL Pattern 'Part' representation

Author: https://github.com/shannonbooth
Commit: 88bea4a717
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3847
Reviewed-by: https://github.com/trflynn89

Libraries/LibURL/Pattern/Part.cpp

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2025, Shannon Booth <shannon@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibURL/Pattern/Component.h>
+#include <LibURL/Pattern/Part.h>
+
+namespace URL::Pattern {
+
+Part::Part(Type type, String value, Modifier modifier)
+    : type(type)
+    , value(move(value))
+    , modifier(modifier)
+{
+}
+
+Part::Part(Type type, String value, Modifier modifier, String name, String prefix, String suffix)
+    : type(type)
+    , value(move(value))
+    , modifier(modifier)
+    , name(move(name))
+    , prefix(move(prefix))
+    , suffix(move(suffix))
+{
+}
+
+StringView Part::type_to_string(Part::Type type)
+{
+    switch (type) {
+    case Type::FixedText:
+        return "FixedText"sv;
+    case Type::Regexp:
+        return "Regexp"sv;
+    case Type::SegmentWildcard:
+        return "SegmentWildcard"sv;
+    case Type::FullWildcard:
+        return "FullWildcard"sv;
+    }
+
+    VERIFY_NOT_REACHED();
+}
+
+// https://urlpattern.spec.whatwg.org/#convert-a-modifier-to-a-string
+StringView Part::convert_modifier_to_string(Part::Modifier modifier)
+{
+    // 1. If modifier is "zero-or-more", then return "*".
+    if (modifier == Modifier::ZeroOrMore)
+        return "*"sv;
+
+    // 2. If modifier is "optional", then return "?".
+    if (modifier == Modifier::Optional)
+        return "?"sv;
+
+    // 3. If modifier is "one-or-more", then return "+".
+    if (modifier == Modifier::OneOrMore)
+        return "+"sv;
+
+    // 4. Return the empty string.
+    return ""sv;
+}
+
+}