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
208
209
210
211
212
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Checked.h>
#include <AK/Forward.h>
#include <AK/Span.h>
#include <AK/StdLibExtras.h>
#include <AK/StringUtils.h>
namespace AK {
class StringView {
public:
ALWAYS_INLINE constexpr StringView() = default;
ALWAYS_INLINE constexpr StringView(const char* characters, size_t length)
: m_characters(characters)
, m_length(length)
{
ASSERT(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
ALWAYS_INLINE StringView(const unsigned char* characters, size_t length)
: m_characters((const char*)characters)
, m_length(length)
{
ASSERT(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
ALWAYS_INLINE constexpr StringView(const char* cstring)
: m_characters(cstring)
, m_length(cstring ? __builtin_strlen(cstring) : 0)
{
}
ALWAYS_INLINE StringView(ReadonlyBytes bytes)
: m_characters(reinterpret_cast<const char*>(bytes.data()))
, m_length(bytes.size())
{
}
StringView(const ByteBuffer&);
StringView(const String&);
StringView(const FlyString&);
bool is_null() const { return !m_characters; }
bool is_empty() const { return m_length == 0; }
const char* characters_without_null_termination() const { return m_characters; }
size_t length() const { return m_length; }
ReadonlyBytes bytes() const { return { m_characters, m_length }; }
const char& operator[](size_t index) const { return m_characters[index]; }
using ConstIterator = SimpleIterator<const StringView, const char>;
constexpr ConstIterator begin() const { return ConstIterator::begin(*this); }
constexpr ConstIterator end() const { return ConstIterator::end(*this); }
unsigned hash() const;
bool starts_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool ends_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool starts_with(char) const;
bool ends_with(char) const;
bool matches(const StringView& mask, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
bool matches(const StringView& mask, Vector<MaskSpan>&, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
bool contains(char) const;
bool contains(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool equals_ignoring_case(const StringView& other) const;
StringView trim_whitespace(TrimMode mode = TrimMode::Both) const { return StringUtils::trim_whitespace(*this, mode); }
Optional<size_t> find_first_of(char) const;
Optional<size_t> find_first_of(const StringView&) const;
Optional<size_t> find_last_of(char) const;
Optional<size_t> find_last_of(const StringView&) const;
Optional<size_t> find(const StringView&) const;
Optional<size_t> find(char c) const;
StringView substring_view(size_t start, size_t length) const;
StringView substring_view(size_t start) const;
Vector<StringView> split_view(char, bool keep_empty = false) const;
Vector<StringView> split_view(const StringView&, bool keep_empty = false) const;
// Create a Vector of StringViews split by line endings. As of CommonMark
// 0.29, the spec defines a line ending as "a newline (U+000A), a carriage
// return (U+000D) not followed by a newline, or a carriage return and a
// following newline.".
Vector<StringView> lines(bool consider_cr = true) const;
template<typename T = int>
Optional<T> to_int() const;
template<typename T = unsigned>
Optional<T> to_uint() const;
// Create a new substring view of this string view, starting either at the beginning of
// the given substring view, or after its end, and continuing until the end of this string
// view (that is, for the remaining part of its length). For example,
//
// StringView str { "foobar" };
// StringView substr = str.substring_view(1, 2); // "oo"
// StringView substr_from = str.substring_view_starting_from_substring(subst); // "oobar"
// StringView substr_after = str.substring_view_starting_after_substring(subst); // "bar"
//
// Note that this only works if the string view passed as an argument is indeed a substring
// view of this string view, such as one created by substring_view() and split_view(). It
// does not work for arbitrary strings; for example declaring substr in the example above as
//
// StringView substr { "oo" };
//
// would not work.
StringView substring_view_starting_from_substring(const StringView& substring) const;
StringView substring_view_starting_after_substring(const StringView& substring) const;
bool operator==(const char* cstring) const
{
if (is_null())
return !cstring;
if (!cstring)
return false;
size_t other_length = __builtin_strlen(cstring);
if (m_length != other_length)
return false;
return !__builtin_memcmp(m_characters, cstring, m_length);
}
bool operator!=(const char* cstring) const
{
return !(*this == cstring);
}
bool operator==(const String&) const;
bool operator==(const StringView& other) const
{
if (is_null())
return other.is_null();
if (other.is_null())
return false;
if (length() != other.length())
return false;
return !__builtin_memcmp(m_characters, other.m_characters, m_length);
}
bool operator!=(const StringView& other) const
{
return !(*this == other);
}
bool operator<(const StringView& other) const
{
if (int c = __builtin_memcmp(m_characters, other.m_characters, min(m_length, other.m_length)))
return c < 0;
return m_length < other.m_length;
}
const StringImpl* impl() const { return m_impl; }
String to_string() const;
bool is_whitespace() const { return StringUtils::is_whitespace(*this); }
template<typename T, typename... Rest>
bool is_one_of(const T& string, Rest... rest) const
{
if (*this == string)
return true;
return is_one_of(rest...);
}
private:
bool is_one_of() const { return false; }
friend class String;
const StringImpl* m_impl { nullptr };
const char* m_characters { nullptr };
size_t m_length { 0 };
};
template<>
struct Traits<StringView> : public GenericTraits<String> {
static unsigned hash(const StringView& s) { return s.hash(); }
};
}
using AK::StringView;
|
