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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <AK/Checked.h>
#include <AK/PrintfImplementation.h>
#include <AK/StdLibExtras.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <AK/UnicodeUtils.h>
#include <AK/Utf32View.h>
#ifndef KERNEL
# include <AK/String.h>
# include <AK/Utf16View.h>
#endif
namespace AK {
inline ErrorOr<void> StringBuilder::will_append(size_t size)
{
Checked<size_t> needed_capacity = m_buffer.size();
needed_capacity += size;
VERIFY(!needed_capacity.has_overflow());
// Prefer to completely use the existing capacity first
if (needed_capacity <= m_buffer.capacity())
return {};
Checked<size_t> expanded_capacity = needed_capacity;
expanded_capacity *= 2;
VERIFY(!expanded_capacity.has_overflow());
TRY(m_buffer.try_ensure_capacity(expanded_capacity.value()));
return {};
}
StringBuilder::StringBuilder(size_t initial_capacity)
{
m_buffer.ensure_capacity(initial_capacity);
}
ErrorOr<void> StringBuilder::try_append(StringView string)
{
if (string.is_empty())
return {};
TRY(will_append(string.length()));
TRY(m_buffer.try_append(string.characters_without_null_termination(), string.length()));
return {};
}
ErrorOr<void> StringBuilder::try_append(char ch)
{
TRY(will_append(1));
TRY(m_buffer.try_append(ch));
return {};
}
void StringBuilder::append(StringView string)
{
MUST(try_append(string));
}
ErrorOr<void> StringBuilder::try_append(char const* characters, size_t length)
{
return try_append(StringView { characters, length });
}
void StringBuilder::append(char const* characters, size_t length)
{
MUST(try_append(characters, length));
}
void StringBuilder::append(char ch)
{
MUST(try_append(ch));
}
void StringBuilder::appendvf(char const* fmt, va_list ap)
{
printf_internal([this](char*&, char ch) {
append(ch);
},
nullptr, fmt, ap);
}
ByteBuffer StringBuilder::to_byte_buffer() const
{
// FIXME: Handle OOM failure.
return ByteBuffer::copy(data(), length()).release_value_but_fixme_should_propagate_errors();
}
#ifndef KERNEL
String StringBuilder::to_string() const
{
if (is_empty())
return String::empty();
return String((char const*)data(), length());
}
String StringBuilder::build() const
{
return to_string();
}
#endif
StringView StringBuilder::string_view() const
{
return StringView { data(), m_buffer.size() };
}
void StringBuilder::clear()
{
m_buffer.clear();
}
ErrorOr<void> StringBuilder::try_append_code_point(u32 code_point)
{
auto nwritten = AK::UnicodeUtils::code_point_to_utf8(code_point, [this](char c) { append(c); });
if (nwritten < 0) {
TRY(try_append(0xef));
TRY(try_append(0xbf));
TRY(try_append(0xbd));
}
return {};
}
void StringBuilder::append_code_point(u32 code_point)
{
MUST(try_append_code_point(code_point));
}
#ifndef KERNEL
ErrorOr<void> StringBuilder::try_append(Utf16View const& utf16_view)
{
for (size_t i = 0; i < utf16_view.length_in_code_units();) {
auto code_point = utf16_view.code_point_at(i);
TRY(try_append_code_point(code_point));
i += (code_point > 0xffff ? 2 : 1);
}
return {};
}
void StringBuilder::append(Utf16View const& utf16_view)
{
MUST(try_append(utf16_view));
}
#endif
ErrorOr<void> StringBuilder::try_append(Utf32View const& utf32_view)
{
for (size_t i = 0; i < utf32_view.length(); ++i) {
auto code_point = utf32_view.code_points()[i];
TRY(try_append_code_point(code_point));
}
return {};
}
void StringBuilder::append(Utf32View const& utf32_view)
{
MUST(try_append(utf32_view));
}
void StringBuilder::append_as_lowercase(char ch)
{
if (ch >= 'A' && ch <= 'Z')
append(ch + 0x20);
else
append(ch);
}
void StringBuilder::append_escaped_for_json(StringView string)
{
MUST(try_append_escaped_for_json(string));
}
ErrorOr<void> StringBuilder::try_append_escaped_for_json(StringView string)
{
for (auto ch : string) {
switch (ch) {
case '\b':
TRY(try_append("\\b"sv));
break;
case '\n':
TRY(try_append("\\n"sv));
break;
case '\t':
TRY(try_append("\\t"sv));
break;
case '\"':
TRY(try_append("\\\""sv));
break;
case '\\':
TRY(try_append("\\\\"sv));
break;
default:
if (ch >= 0 && ch <= 0x1f)
TRY(try_appendff("\\u{:04x}", ch));
else
TRY(try_append(ch));
}
}
return {};
}
}
|
