30 #include <drizzled/utf8/core.h>
38 template <
typename octet_iterator>
39 octet_iterator append(uint32_t cp, octet_iterator result)
42 *(result++) = static_cast<uint8_t>(cp);
43 else if (cp < 0x800) {
44 *(result++) = static_cast<uint8_t>((cp >> 6) | 0xc0);
45 *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
47 else if (cp < 0x10000) {
48 *(result++) = static_cast<uint8_t>((cp >> 12) | 0xe0);
49 *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
50 *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
53 *(result++) = static_cast<uint8_t>((cp >> 18) | 0xf0);
54 *(result++) = static_cast<uint8_t>(((cp >> 12) & 0x3f)| 0x80);
55 *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
56 *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
61 template <
typename octet_iterator>
62 uint32_t next(octet_iterator& it)
64 uint32_t cp = internal::mask8(*it);
65 typename std::iterator_traits<octet_iterator>::difference_type length = utf8::internal::sequence_length(it);
71 cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
75 cp = ((cp << 12) & 0xffff) + ((internal::mask8(*it) << 6) & 0xfff);
81 cp = ((cp << 18) & 0x1fffff) + ((internal::mask8(*it) << 12) & 0x3ffff);
83 cp += (internal::mask8(*it) << 6) & 0xfff;
92 template <
typename octet_iterator>
93 uint32_t peek_next(octet_iterator it)
98 template <
typename octet_iterator>
99 uint32_t prior(octet_iterator& it)
101 while (internal::is_trail(*(--it))) ;
102 octet_iterator temp = it;
107 template <
typename octet_iterator>
108 inline uint32_t previous(octet_iterator& it)
113 template <
typename octet_iterator,
typename distance_type>
114 void advance (octet_iterator& it, distance_type n)
116 for (distance_type i = 0; i < n; ++i)
120 template <
typename octet_iterator>
121 typename std::iterator_traits<octet_iterator>::difference_type
122 distance (octet_iterator first, octet_iterator last)
124 typename std::iterator_traits<octet_iterator>::difference_type dist;
125 for (dist = 0; first < last; ++dist)
130 template <
typename u16bit_iterator,
typename octet_iterator>
131 octet_iterator utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
133 while (start != end) {
134 uint32_t cp = internal::mask16(*start++);
136 if (internal::is_lead_surrogate(cp)) {
137 uint32_t trail_surrogate = internal::mask16(*start++);
138 cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
140 result = append(cp, result);
145 template <
typename u16bit_iterator,
typename octet_iterator>
146 u16bit_iterator utf8to16 (octet_iterator start, octet_iterator end, u16bit_iterator result)
148 while (start < end) {
149 uint32_t cp = next(start);
151 *result++ =
static_cast<uint16_t
>((cp >> 10) + internal::LEAD_OFFSET);
152 *result++ =
static_cast<uint16_t
>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
155 *result++ =
static_cast<uint16_t
>(cp);
160 template <
typename octet_iterator,
typename u32bit_iterator>
161 octet_iterator utf32to8 (u32bit_iterator start, u32bit_iterator end, octet_iterator result)
164 result = append(*(start++), result);
169 template <
typename octet_iterator,
typename u32bit_iterator>
170 u32bit_iterator utf8to32 (octet_iterator start, octet_iterator end, u32bit_iterator result)
173 (*result++) = next(start);
179 template <
typename octet_iterator>
180 class iterator :
public std::iterator <std::bidirectional_iterator_tag, uint32_t> {
184 explicit iterator (
const octet_iterator& octet_it): it(octet_it) {}
186 octet_iterator base ()
const {
return it; }
187 uint32_t operator * ()
const
189 octet_iterator temp = it;
192 bool operator == (
const iterator& rhs)
const
194 return (it == rhs.it);
196 bool operator != (
const iterator& rhs)
const
198 return !(operator == (rhs));
202 std::advance(it, internal::sequence_length(it));
208 std::advance(it, internal::sequence_length(it));