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
/*
* Copyright (C) 2013-2016 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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
* FOUNDATION 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.
*/
#ifndef ITERABLE_SPLIT_STRING_HXX
#define ITERABLE_SPLIT_STRING_HXX
#include "StringView.hxx"
#include <iterator>
/**
* Split a string at a certain separator character into sub strings
* and allow iterating over the segments.
*
* Two consecutive separator characters result in an empty string.
*
* An empty input string returns one empty string.
*/
template<typename T>
class BasicIterableSplitString {
typedef BasicStringView<T> StringView;
typedef typename StringView::value_type value_type;
StringView s;
value_type separator;
public:
constexpr BasicIterableSplitString(StringView _s,
value_type _separator)
:s(_s), separator(_separator) {}
class Iterator final {
friend class BasicIterableSplitString;
StringView current, rest;
value_type separator;
Iterator(StringView _s, value_type _separator)
:rest(_s), separator(_separator) {
Next();
}
constexpr Iterator(std::nullptr_t n)
:current(n), rest(n), separator(0) {}
void Next() {
if (rest == nullptr)
current = nullptr;
else {
const auto *i = rest.Find(separator);
if (i == nullptr) {
current = rest;
rest.data = nullptr;
} else {
current.data = rest.data;
current.size = i - current.data;
rest.size -= current.size + 1;
rest.data = i + 1;
}
}
}
public:
typedef std::forward_iterator_tag iterator_category;
Iterator &operator++() {
Next();
return *this;
}
constexpr bool operator==(Iterator other) const {
return current.data == other.current.data;
}
constexpr bool operator!=(Iterator other) const {
return !(*this == other);
}
constexpr StringView operator*() const {
return current;
}
constexpr const StringView *operator->() const {
return ¤t;
}
};
typedef Iterator iterator;
typedef Iterator const_iterator;
const_iterator begin() const {
return {s, separator};
}
constexpr const_iterator end() const {
return {nullptr};
}
};
using IterableSplitString = BasicIterableSplitString<char>;
#ifdef _UNICODE
using WIterableSplitString = BasicIterableSplitString<wchar_t>;
using TIterableSplitString = WIterableSplitString;
#else
using TIterableSplitString = IterableSplitString;
#endif
#endif