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
|
#ifndef utf8_iterator_hh_INCLUDED
#define utf8_iterator_hh_INCLUDED
#include "utf8.hh"
#include <iterator>
namespace Kakoune
{
namespace utf8
{
// adapter for an iterator on bytes which permits to iterate
// on unicode codepoints instead.
template<typename Iterator,
typename InvalidPolicy = utf8::InvalidPolicy::Pass>
class iterator : public std::iterator<std::forward_iterator_tag,
Codepoint, CharCount>
{
public:
iterator(Iterator it, Iterator begin, Iterator end)
: m_it{std::move(it)}, m_begin{std::move(begin)}, m_end{std::move(end)}
{}
template<typename Container>
iterator(Iterator it, const Container& c)
: m_it{std::move(it)}, m_begin{begin(c)}, m_end{end(c)}
{}
iterator& operator++()
{
m_it = utf8::next(m_it, m_end);
invalidate_value();
return *this;
}
iterator operator++(int)
{
iterator save = *this;
++*this;
return save;
}
iterator& operator--()
{
m_it = utf8::previous(m_it, m_begin);
invalidate_value();
return *this;
}
iterator operator--(int)
{
iterator save = *this;
--*this;
return save;
}
iterator operator+(CharCount count) const
{
if (count < 0)
return operator-(-count);
iterator res = *this;
while (count--)
++res;
return res;
}
iterator operator-(CharCount count) const
{
if (count < 0)
return operator+(-count);
iterator res = *this;
while (count--)
--res;
return res;
}
bool operator==(const iterator& other) { return m_it == other.m_it; }
bool operator!=(const iterator& other) { return m_it != other.m_it; }
bool operator< (const iterator& other) const { return m_it < other.m_it; }
bool operator<= (const iterator& other) const { return m_it <= other.m_it; }
bool operator> (const iterator& other) const { return m_it > other.m_it; }
bool operator>= (const iterator& other) const { return m_it >= other.m_it; }
bool operator==(const Iterator& other) { return m_it == other; }
bool operator!=(const Iterator& other) { return m_it != other; }
bool operator< (const Iterator& other) const { return m_it < other; }
bool operator<= (const Iterator& other) const { return m_it <= other; }
bool operator> (const Iterator& other) const { return m_it > other; }
bool operator>= (const Iterator& other) const { return m_it >= other; }
CharCount operator-(const iterator& other) const
{
return utf8::distance(other.m_it, m_it);
}
Codepoint operator*() const
{
return get_value();
}
const Iterator& base() const { return m_it; }
Iterator& base() { return m_it; }
private:
void invalidate_value() { m_value = -1; }
Codepoint get_value() const
{
if (m_value == -1)
m_value = utf8::codepoint<InvalidPolicy>(m_it, m_end);
return m_value;
}
Iterator m_it;
Iterator m_begin;
Iterator m_end;
mutable Codepoint m_value = -1;
};
}
}
#endif // utf8_iterator_hh_INCLUDED
|
