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ladybird/AK/FlyString.h

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AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/String.h>
namespace AK {
class FlyString {
public:
FlyString() {}
FlyString(const String&);
FlyString(const StringView&);
FlyString(const char*);
AK: Add FlyString::is_null()
2020-03-24 13:03:42 +00:00
bool is_null() const { return !m_impl; }
AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
bool operator==(const FlyString& other) const { return m_impl == other.m_impl; }
bool operator!=(const FlyString& other) const { return m_impl != other.m_impl; }
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
bool operator==(const String&) const;
bool operator!=(const String& string) const { return !(*this == string); }
bool operator==(const StringView&) const;
bool operator!=(const StringView& string) const { return !(*this == string); }
bool operator==(const char*) const;
bool operator!=(const char* string) const { return !(*this == string); }
AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
const StringImpl* impl() const { return m_impl; }
const char* characters() const { return m_impl ? m_impl->characters() : nullptr; }
size_t length() const { return m_impl ? m_impl->length() : 0; }
AK: Let FlyString::hash() assume that the string was already hashed Since the FlyString deduplication mechanism uses a HashTable, we know that any StringImpl inside a non-null FlyString will already have its lazily computed hash.
2020-04-13 10:05:19 +00:00
[[gnu::always_inline]] inline u32 hash() const { return m_impl ? m_impl->existing_hash() : 0; }
AK: Add FlyString::hash()
2020-04-10 14:26:59 +00:00
AK: Reduce header dependency graph of String.h String.h no longer pulls in StringView.h. We do this by moving a bunch of String functions out-of-line.
2020-03-23 12:45:10 +00:00
StringView view() const;
AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
AK: Add FlyString::to_lowercase() and LogStream operator<<(FlyString)
2020-03-22 18:07:02 +00:00
FlyString to_lowercase() const;
AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
int to_int(bool& ok) const;
AK: Add FlyString::equals_ignoring_case(StringView) And share the code with String by moving the logic to StringUtils. :^)
2020-03-22 12:07:45 +00:00
bool equals_ignoring_case(const StringView&) const;
AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
static void did_destroy_impl(Badge<StringImpl>, StringImpl&);
private:
RefPtr<StringImpl> m_impl;
};
template<>
struct Traits<FlyString> : public GenericTraits<FlyString> {
AK: Let FlyString::hash() assume that the string was already hashed Since the FlyString deduplication mechanism uses a HashTable, we know that any StringImpl inside a non-null FlyString will already have its lazily computed hash.
2020-04-13 10:05:19 +00:00
static unsigned hash(const FlyString& s) { return s.hash(); }
AK: Add FlyString, a simple flyweight string class FlyString is a flyweight string class that wraps a RefPtr<StringImpl> known to be unique among the set of FlyStrings. The class is very unoptimized at the moment. When to use FlyString: - When you want O(1) string comparison - When you want to deduplicate a lot of identical strings When not to use FlyString: - For strings that don't need either of the above features - For strings that are likely to be unique
2020-03-22 09:12:55 +00:00
};
}
using AK::FlyString;
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