mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-05 20:49:59 +00:00
aeee98b3a1
This commit removes DeprecatedString's "null" state, and replaces all its users with one of the following: - A normal, empty DeprecatedString - Optional<DeprecatedString> Note that null states of DeprecatedFlyString/StringView/etc are *not* affected by this commit. However, DeprecatedString::empty() is now considered equal to a null StringView.
138 lines
3.7 KiB
C++
138 lines
3.7 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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#include <AK/CharacterTypes.h>
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#include <AK/DeprecatedFlyString.h>
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#include <AK/StringHash.h>
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#include <AK/StringImpl.h>
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#include <AK/kmalloc.h>
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namespace AK {
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static StringImpl* s_the_empty_stringimpl = nullptr;
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StringImpl& StringImpl::the_empty_stringimpl()
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{
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if (!s_the_empty_stringimpl) {
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void* slot = kmalloc(sizeof(StringImpl) + sizeof(char));
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s_the_empty_stringimpl = new (slot) StringImpl(ConstructTheEmptyStringImpl);
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}
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return *s_the_empty_stringimpl;
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}
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StringImpl::StringImpl(ConstructWithInlineBufferTag, size_t length)
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: m_length(length)
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{
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}
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StringImpl::~StringImpl()
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{
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if (m_fly)
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DeprecatedFlyString::did_destroy_impl({}, *this);
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}
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NonnullRefPtr<StringImpl const> StringImpl::create_uninitialized(size_t length, char*& buffer)
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{
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VERIFY(length);
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void* slot = kmalloc(allocation_size_for_stringimpl(length));
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VERIFY(slot);
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auto new_stringimpl = adopt_ref(*new (slot) StringImpl(ConstructWithInlineBuffer, length));
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buffer = const_cast<char*>(new_stringimpl->characters());
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buffer[length] = '\0';
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return new_stringimpl;
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}
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RefPtr<StringImpl const> StringImpl::create(char const* cstring, size_t length, ShouldChomp should_chomp)
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{
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if (should_chomp) {
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while (length) {
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char last_ch = cstring[length - 1];
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if (!last_ch || last_ch == '\n' || last_ch == '\r')
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--length;
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else
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break;
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}
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}
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if (!length)
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return the_empty_stringimpl();
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char* buffer;
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auto new_stringimpl = create_uninitialized(length, buffer);
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memcpy(buffer, cstring, length * sizeof(char));
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return new_stringimpl;
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}
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RefPtr<StringImpl const> StringImpl::create(char const* cstring, ShouldChomp shouldChomp)
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{
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if (!cstring || !*cstring)
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return the_empty_stringimpl();
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return create(cstring, strlen(cstring), shouldChomp);
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}
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RefPtr<StringImpl const> StringImpl::create(ReadonlyBytes bytes, ShouldChomp shouldChomp)
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{
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return StringImpl::create(reinterpret_cast<char const*>(bytes.data()), bytes.size(), shouldChomp);
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}
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RefPtr<StringImpl const> StringImpl::create_lowercased(char const* cstring, size_t length)
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{
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if (!length)
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return the_empty_stringimpl();
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char* buffer;
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auto impl = create_uninitialized(length, buffer);
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for (size_t i = 0; i < length; ++i)
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buffer[i] = (char)to_ascii_lowercase(cstring[i]);
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return impl;
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}
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RefPtr<StringImpl const> StringImpl::create_uppercased(char const* cstring, size_t length)
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{
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if (!length)
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return the_empty_stringimpl();
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char* buffer;
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auto impl = create_uninitialized(length, buffer);
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for (size_t i = 0; i < length; ++i)
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buffer[i] = (char)to_ascii_uppercase(cstring[i]);
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return impl;
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}
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NonnullRefPtr<StringImpl const> StringImpl::to_lowercase() const
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{
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for (size_t i = 0; i < m_length; ++i) {
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if (is_ascii_upper_alpha(characters()[i]))
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return create_lowercased(characters(), m_length).release_nonnull();
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}
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return const_cast<StringImpl&>(*this);
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}
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NonnullRefPtr<StringImpl const> StringImpl::to_uppercase() const
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{
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for (size_t i = 0; i < m_length; ++i) {
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if (is_ascii_lower_alpha(characters()[i]))
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return create_uppercased(characters(), m_length).release_nonnull();
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}
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return const_cast<StringImpl&>(*this);
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}
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unsigned StringImpl::case_insensitive_hash() const
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{
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return case_insensitive_string_hash(characters(), length());
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}
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void StringImpl::compute_hash() const
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{
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if (!length())
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m_hash = 0;
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else
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m_hash = string_hash(characters(), m_length);
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m_has_hash = true;
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}
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}
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