AK: Add formatters for Utf8View and Utf32View

Useful for debugging, especially in templated contexts.

AK/CMakeLists.txt

@@ -33,6 +33,7 @@ set(AK_SOURCES
     URL.cpp
     URLParser.cpp
     Utf16View.cpp
+    Utf32View.cpp
     Utf8View.cpp
     UUID.cpp
 )

AK/Utf32View.cpp

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/StringBuilder.h>
+#include <AK/Utf32View.h>
+
+namespace AK {
+
+ErrorOr<void> Formatter<Utf32View>::format(FormatBuilder& builder, Utf32View const& string)
+{
+    return builder.builder().try_append(string);
+}
+
+}

AK/Utf32View.h

@@ -8,6 +8,7 @@
 
 #include <AK/Assertions.h>
 #include <AK/Checked.h>
+#include <AK/Format.h>
 #include <AK/Types.h>
 
 namespace AK {
@@ -119,6 +120,11 @@ private:
     size_t m_length { 0 };
 };
 
+template<>
+struct Formatter<Utf32View> : Formatter<StringView> {
+    ErrorOr<void> format(FormatBuilder&, Utf32View const&);
+};
+
 }
 
 #if USING_AK_GLOBALLY

AK/Utf8View.cpp

@@ -303,4 +303,9 @@ Optional<u32> Utf8CodePointIterator::peek(size_t offset) const
     return *new_iterator;
 }
 
+ErrorOr<void> Formatter<Utf8View>::format(FormatBuilder& builder, Utf8View const& string)
+{
+    return Formatter<StringView>::format(builder, string.as_string());
+}
+
 }

AK/Utf8View.h

@@ -8,6 +8,7 @@
 #pragma once
 
 #include <AK/DeprecatedString.h>
+#include <AK/Format.h>
 #include <AK/StringView.h>
 #include <AK/Types.h>
 
@@ -164,6 +165,11 @@ private:
     Utf8CodePointIterator m_it;
 };
 
+template<>
+struct Formatter<Utf8View> : Formatter<StringView> {
+    ErrorOr<void> format(FormatBuilder&, Utf8View const&);
+};
+
 }
 
 #if USING_AK_GLOBALLY