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AK: Move StringData from String.cpp to a newly created StringInternals.h

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This is done to allow using it in files other than AK/String.cpp.
This commit is contained in:
Dan Klishch 2023-10-28 15:12:53 -04:00 • committed by Andrew Kaster
parent 855ea192be
commit 6e2f627cb3
2 changed files with 80 additions and 63 deletions
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64
AK/String.cpp
View file

@ -11,6 +11,7 @@
#include <AK/MemMem.h>
#include <AK/Stream.h>
#include <AK/String.h>
#include <AK/StringInternals.h>
#include <AK/Vector.h>
#include <stdlib.h>
@ -18,69 +19,6 @@ namespace AK {
namespace Detail {
class StringData final : public RefCounted<StringData> {
public:
static ErrorOr<NonnullRefPtr<StringData>> create_uninitialized(size_t, u8*& buffer);
static ErrorOr<NonnullRefPtr<StringData>> create_substring(StringData const& superstring, size_t start, size_t byte_count);
static ErrorOr<NonnullRefPtr<StringData>> from_utf8(char const* utf8_bytes, size_t);
static ErrorOr<NonnullRefPtr<StringData>> from_stream(Stream&, size_t byte_count);
struct SubstringData {
StringData const* superstring { nullptr };
u32 start_offset { 0 };
};
void operator delete(void* ptr);
~StringData();
SubstringData const& substring_data() const
{
return *reinterpret_cast<SubstringData const*>(m_bytes_or_substring_data);
}
// NOTE: There is no guarantee about null-termination.
ReadonlyBytes bytes() const
{
if (m_substring) {
auto const& data = substring_data();
return data.superstring->bytes().slice(data.start_offset, m_byte_count);
}
return { &m_bytes_or_substring_data[0], m_byte_count };
}
StringView bytes_as_string_view() const { return { bytes() }; }
bool operator==(StringData const& other) const
{
return bytes_as_string_view() == other.bytes_as_string_view();
}
unsigned hash() const
{
if (!m_has_hash)
compute_hash();
return m_hash;
}
bool is_fly_string() const { return m_is_fly_string; }
void set_fly_string(bool is_fly_string) const { m_is_fly_string = is_fly_string; }
private:
explicit StringData(size_t byte_count);
StringData(StringData const& superstring, size_t start, size_t byte_count);
void compute_hash() const;
u32 m_byte_count { 0 };
mutable unsigned m_hash { 0 };
mutable bool m_has_hash { false };
bool m_substring { false };
mutable bool m_is_fly_string { false };
alignas(SubstringData) u8 m_bytes_or_substring_data[0];
};
void StringData::operator delete(void* ptr)
{
free(ptr);

79
AK/StringInternals.h Normal file
View file

@ -0,0 +1,79 @@
/*
* Copyright (c) 2023, Dan Klishch <danilklishch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/Span.h>
#include <AK/StringView.h>
namespace AK::Detail {
class StringData final : public RefCounted<StringData> {
public:
static ErrorOr<NonnullRefPtr<StringData>> create_uninitialized(size_t, u8*& buffer);
static ErrorOr<NonnullRefPtr<StringData>> create_substring(StringData const& superstring, size_t start, size_t byte_count);
static ErrorOr<NonnullRefPtr<StringData>> from_utf8(char const* utf8_bytes, size_t);
static ErrorOr<NonnullRefPtr<StringData>> from_stream(Stream&, size_t byte_count);
struct SubstringData {
StringData const* superstring { nullptr };
u32 start_offset { 0 };
};
void operator delete(void* ptr);
~StringData();
SubstringData const& substring_data() const
{
return *reinterpret_cast<SubstringData const*>(m_bytes_or_substring_data);
}
// NOTE: There is no guarantee about null-termination.
ReadonlyBytes bytes() const
{
if (m_substring) {
auto const& data = substring_data();
return data.superstring->bytes().slice(data.start_offset, m_byte_count);
}
return { &m_bytes_or_substring_data[0], m_byte_count };
}
StringView bytes_as_string_view() const { return { bytes() }; }
bool operator==(StringData const& other) const
{
return bytes_as_string_view() == other.bytes_as_string_view();
}
unsigned hash() const
{
if (!m_has_hash)
compute_hash();
return m_hash;
}
bool is_fly_string() const { return m_is_fly_string; }
void set_fly_string(bool is_fly_string) const { m_is_fly_string = is_fly_string; }
private:
explicit StringData(size_t byte_count);
StringData(StringData const& superstring, size_t start, size_t byte_count);
void compute_hash() const;
u32 m_byte_count { 0 };
mutable unsigned m_hash { 0 };
mutable bool m_has_hash { false };
bool m_substring { false };
mutable bool m_is_fly_string { false };
alignas(SubstringData) u8 m_bytes_or_substring_data[0];
};
}