1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/CharacterTypes.h>
#include <AK/DeprecatedFlyString.h>
#include <AK/StringHash.h>
#include <AK/StringImpl.h>
#include <AK/kmalloc.h>
namespace AK {
static StringImpl* s_the_empty_stringimpl = nullptr;
StringImpl& StringImpl::the_empty_stringimpl()
{
if (!s_the_empty_stringimpl) {
void* slot = kmalloc(sizeof(StringImpl) + sizeof(char));
s_the_empty_stringimpl = new (slot) StringImpl(ConstructTheEmptyStringImpl);
}
return *s_the_empty_stringimpl;
}
StringImpl::StringImpl(ConstructWithInlineBufferTag, size_t length)
: m_length(length)
{
}
StringImpl::~StringImpl()
{
if (m_fly)
DeprecatedFlyString::did_destroy_impl({}, *this);
}
NonnullRefPtr<StringImpl const> StringImpl::create_uninitialized(size_t length, char*& buffer)
{
VERIFY(length);
void* slot = kmalloc(allocation_size_for_stringimpl(length));
VERIFY(slot);
auto new_stringimpl = adopt_ref(*new (slot) StringImpl(ConstructWithInlineBuffer, length));
buffer = const_cast<char*>(new_stringimpl->characters());
buffer[length] = '\0';
return new_stringimpl;
}
RefPtr<StringImpl const> StringImpl::create(char const* cstring, size_t length, ShouldChomp should_chomp)
{
if (!cstring)
return nullptr;
if (should_chomp) {
while (length) {
char last_ch = cstring[length - 1];
if (!last_ch || last_ch == '\n' || last_ch == '\r')
--length;
else
break;
}
}
if (!length)
return the_empty_stringimpl();
char* buffer;
auto new_stringimpl = create_uninitialized(length, buffer);
memcpy(buffer, cstring, length * sizeof(char));
return new_stringimpl;
}
RefPtr<StringImpl const> StringImpl::create(char const* cstring, ShouldChomp shouldChomp)
{
if (!cstring)
return nullptr;
if (!*cstring)
return the_empty_stringimpl();
return create(cstring, strlen(cstring), shouldChomp);
}
RefPtr<StringImpl const> StringImpl::create(ReadonlyBytes bytes, ShouldChomp shouldChomp)
{
return StringImpl::create(reinterpret_cast<char const*>(bytes.data()), bytes.size(), shouldChomp);
}
RefPtr<StringImpl const> StringImpl::create_lowercased(char const* cstring, size_t length)
{
if (!cstring)
return nullptr;
if (!length)
return the_empty_stringimpl();
char* buffer;
auto impl = create_uninitialized(length, buffer);
for (size_t i = 0; i < length; ++i)
buffer[i] = (char)to_ascii_lowercase(cstring[i]);
return impl;
}
RefPtr<StringImpl const> StringImpl::create_uppercased(char const* cstring, size_t length)
{
if (!cstring)
return nullptr;
if (!length)
return the_empty_stringimpl();
char* buffer;
auto impl = create_uninitialized(length, buffer);
for (size_t i = 0; i < length; ++i)
buffer[i] = (char)to_ascii_uppercase(cstring[i]);
return impl;
}
NonnullRefPtr<StringImpl const> StringImpl::to_lowercase() const
{
for (size_t i = 0; i < m_length; ++i) {
if (is_ascii_upper_alpha(characters()[i]))
return create_lowercased(characters(), m_length).release_nonnull();
}
return const_cast<StringImpl&>(*this);
}
NonnullRefPtr<StringImpl const> StringImpl::to_uppercase() const
{
for (size_t i = 0; i < m_length; ++i) {
if (is_ascii_lower_alpha(characters()[i]))
return create_uppercased(characters(), m_length).release_nonnull();
}
return const_cast<StringImpl&>(*this);
}
unsigned StringImpl::case_insensitive_hash() const
{
return case_insensitive_string_hash(characters(), length());
}
void StringImpl::compute_hash() const
{
if (!length())
m_hash = 0;
else
m_hash = string_hash(characters(), m_length);
m_has_hash = true;
}
}
|
