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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
#include "StringImpl.h"
#include "StdLibExtras.h"
#include "kmalloc.h"
namespace AK {
static StringImpl* s_the_empty_stringimpl = nullptr;
void StringImpl::initialize_globals()
{
s_the_empty_stringimpl = nullptr;
}
StringImpl& StringImpl::the_empty_stringimpl()
{
if (!s_the_empty_stringimpl)
s_the_empty_stringimpl = new StringImpl(ConstructTheEmptyStringImpl);;
return *s_the_empty_stringimpl;
}
StringImpl::~StringImpl()
{
}
static inline size_t allocationSizeForStringImpl(size_t length)
{
return sizeof(StringImpl) + (sizeof(char) * length) + sizeof(char);
}
RetainPtr<StringImpl> StringImpl::create_uninitialized(size_t length, char*& buffer)
{
ASSERT(length);
void* slot = kmalloc(allocationSizeForStringImpl(length));
if (!slot)
return nullptr;
auto newStringImpl = adopt(*new (slot) StringImpl(ConstructWithInlineBuffer, length));
buffer = const_cast<char*>(newStringImpl->m_characters);
buffer[length] = '\0';
return newStringImpl;
}
RetainPtr<StringImpl> StringImpl::create(const char* cstring, size_t length, ShouldChomp shouldChomp)
{
if (!cstring)
return nullptr;
if (!*cstring)
return the_empty_stringimpl();
char* buffer;
auto newStringImpl = create_uninitialized(length, buffer);
if (!newStringImpl)
return nullptr;
memcpy(buffer, cstring, length * sizeof(char));
if (shouldChomp && buffer[length - 1] == '\n') {
buffer[length - 1] = '\0';
--newStringImpl->m_length;
}
return newStringImpl;
}
RetainPtr<StringImpl> StringImpl::create(const char* cstring, ShouldChomp shouldChomp)
{
if (!cstring)
return nullptr;
return create(cstring, strlen(cstring), shouldChomp);
}
static inline bool isASCIILowercase(char c)
{
return c >= 'a' && c <= 'z';
}
static inline bool isASCIIUppercase(char c)
{
return c >= 'A' && c <= 'Z';
}
static inline char toASCIILowercase(char c)
{
if (isASCIIUppercase(c))
return c | 0x20;
return c;
}
static inline char toASCIIUppercase(char c)
{
if (isASCIILowercase(c))
return c & ~0x20;
return c;
}
RetainPtr<StringImpl> StringImpl::to_lowercase() const
{
if (!m_length)
return const_cast<StringImpl*>(this);
for (size_t i = 0; i < m_length; ++i) {
if (!isASCIILowercase(m_characters[i]))
goto slowPath;
}
return const_cast<StringImpl*>(this);
slowPath:
char* buffer;
auto lowercased = create_uninitialized(m_length, buffer);
if (!lowercased)
return nullptr;
for (size_t i = 0; i < m_length; ++i)
buffer[i] = toASCIILowercase(m_characters[i]);
return lowercased;
}
RetainPtr<StringImpl> StringImpl::to_uppercase() const
{
if (!m_length)
return const_cast<StringImpl*>(this);
for (size_t i = 0; i < m_length; ++i) {
if (!isASCIIUppercase(m_characters[i]))
goto slowPath;
}
return const_cast<StringImpl*>(this);
slowPath:
char* buffer;
auto uppercased = create_uninitialized(m_length, buffer);
if (!uppercased)
return nullptr;
for (size_t i = 0; i < m_length; ++i)
buffer[i] = toASCIIUppercase(m_characters[i]);
return uppercased;
}
void StringImpl::compute_hash() const
{
if (!length()) {
m_hash = 0;
} else {
unsigned hash = 0;
for (size_t i = 0; i < m_length; ++i) {
hash += m_characters[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
m_hash = hash;
}
m_hasHash = true;
}
}
|
