AK+Everywhere: Rename FlyString to DeprecatedFlyString

DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so
let's rename it to A) match the name of DeprecatedString, B) write a new
FlyString class that is tied to String.

1 files changed, 106 insertions, 0 deletions

diff --git a/AK/DeprecatedFlyString.h b/AK/DeprecatedFlyString.h
new file mode 100644
index 0000000000..513cbc3134
--- /dev/null
+++ b/AK/DeprecatedFlyString.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/DeprecatedString.h>
+#include <AK/StringUtils.h>
+
+namespace AK {
+
+class DeprecatedFlyString {
+public:
+    DeprecatedFlyString() = default;
+    DeprecatedFlyString(DeprecatedFlyString const& other)
+        : m_impl(other.impl())
+    {
+    }
+    DeprecatedFlyString(DeprecatedFlyString&& other)
+        : m_impl(move(other.m_impl))
+    {
+    }
+    DeprecatedFlyString(DeprecatedString const&);
+    DeprecatedFlyString(StringView);
+    DeprecatedFlyString(char const* string)
+        : DeprecatedFlyString(static_cast<DeprecatedString>(string))
+    {
+    }
+
+    static DeprecatedFlyString from_fly_impl(NonnullRefPtr<StringImpl> impl)
+    {
+        VERIFY(impl->is_fly());
+        DeprecatedFlyString string;
+        string.m_impl = move(impl);
+        return string;
+    }
+
+    DeprecatedFlyString& operator=(DeprecatedFlyString const& other)
+    {
+        m_impl = other.m_impl;
+        return *this;
+    }
+
+    DeprecatedFlyString& operator=(DeprecatedFlyString&& other)
+    {
+        m_impl = move(other.m_impl);
+        return *this;
+    }
+
+    bool is_empty() const { return !m_impl || !m_impl->length(); }
+    bool is_null() const { return !m_impl; }
+
+    bool operator==(DeprecatedFlyString const& other) const { return m_impl == other.m_impl; }
+
+    bool operator==(DeprecatedString const&) const;
+
+    bool operator==(StringView) const;
+
+    bool operator==(char const*) const;
+
+    StringImpl const* impl() const { return m_impl; }
+    char const* characters() const { return m_impl ? m_impl->characters() : nullptr; }
+    size_t length() const { return m_impl ? m_impl->length() : 0; }
+
+    ALWAYS_INLINE u32 hash() const { return m_impl ? m_impl->existing_hash() : 0; }
+    ALWAYS_INLINE StringView view() const { return m_impl ? m_impl->view() : StringView {}; }
+
+    DeprecatedFlyString to_lowercase() const;
+
+    template<typename T = int>
+    Optional<T> to_int(TrimWhitespace = TrimWhitespace::Yes) const;
+    template<typename T = unsigned>
+    Optional<T> to_uint(TrimWhitespace = TrimWhitespace::Yes) const;
+#ifndef KERNEL
+    Optional<double> to_double(TrimWhitespace = TrimWhitespace::Yes) const;
+    Optional<float> to_float(TrimWhitespace = TrimWhitespace::Yes) const;
+#endif
+
+    bool equals_ignoring_case(StringView) const;
+    bool starts_with(StringView, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
+    bool ends_with(StringView, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
+
+    static void did_destroy_impl(Badge<StringImpl>, StringImpl&);
+
+    template<typename... Ts>
+    [[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
+    {
+        return (... || this->operator==(forward<Ts>(strings)));
+    }
+
+private:
+    RefPtr<StringImpl> m_impl;
+};
+
+template<>
+struct Traits<DeprecatedFlyString> : public GenericTraits<DeprecatedFlyString> {
+    static unsigned hash(DeprecatedFlyString const& s) { return s.hash(); }
+};
+
+}
+
+#if USING_AK_GLOBALLY
+using AK::DeprecatedFlyString;
+#endif