mirror of
https://github.com/SerenityOS/serenity
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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
127 lines
3 KiB
C++
127 lines
3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/Span.h>
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#include <AK/Types.h>
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#include <AK/kmalloc.h>
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namespace AK {
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enum ShouldChomp {
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NoChomp,
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Chomp
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};
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class StringImpl : public RefCounted<StringImpl> {
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public:
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static NonnullRefPtr<StringImpl> create_uninitialized(size_t length, char*& buffer);
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static RefPtr<StringImpl> create(const char* cstring, ShouldChomp = NoChomp);
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static RefPtr<StringImpl> create(const char* cstring, size_t length, ShouldChomp = NoChomp);
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static RefPtr<StringImpl> create(ReadonlyBytes, ShouldChomp = NoChomp);
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NonnullRefPtr<StringImpl> to_lowercase() const;
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NonnullRefPtr<StringImpl> to_uppercase() const;
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void operator delete(void* ptr)
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{
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kfree(ptr);
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}
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static StringImpl& the_empty_stringimpl();
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~StringImpl();
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size_t length() const { return m_length; }
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// Includes NUL-terminator.
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const char* characters() const { return &m_inline_buffer[0]; }
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ALWAYS_INLINE ReadonlyBytes bytes() const { return { characters(), length() }; }
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const char& operator[](size_t i) const
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{
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VERIFY(i < m_length);
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return characters()[i];
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}
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bool operator==(const StringImpl& other) const
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{
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if (length() != other.length())
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return false;
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return !__builtin_memcmp(characters(), other.characters(), length());
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}
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unsigned hash() const
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{
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if (!m_has_hash)
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compute_hash();
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return m_hash;
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}
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unsigned existing_hash() const
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{
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return m_hash;
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}
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bool is_fly() const { return m_fly; }
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void set_fly(Badge<FlyString>, bool fly) const { m_fly = fly; }
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private:
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enum ConstructTheEmptyStringImplTag {
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ConstructTheEmptyStringImpl
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};
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explicit StringImpl(ConstructTheEmptyStringImplTag)
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: m_fly(true)
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{
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m_inline_buffer[0] = '\0';
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}
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enum ConstructWithInlineBufferTag {
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ConstructWithInlineBuffer
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};
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StringImpl(ConstructWithInlineBufferTag, size_t length);
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void compute_hash() const;
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size_t m_length { 0 };
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mutable unsigned m_hash { 0 };
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mutable bool m_has_hash { false };
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mutable bool m_fly { false };
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char m_inline_buffer[0];
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};
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constexpr u32 string_hash(const char* characters, size_t length)
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{
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u32 hash = 0;
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for (size_t i = 0; i < length; ++i) {
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hash += (u32)characters[i];
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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hash += hash << 3;
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hash ^= hash >> 11;
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hash += hash << 15;
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return hash;
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}
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template<>
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struct Formatter<StringImpl> : Formatter<StringView> {
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void format(FormatBuilder& builder, const StringImpl& value)
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{
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Formatter<StringView>::format(builder, { value.characters(), value.length() });
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}
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};
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}
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using AK::Chomp;
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using AK::NoChomp;
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using AK::string_hash;
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using AK::StringImpl;
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