Drizzled Public API Documentation

utf8.h
1 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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4  Copyright (C) 2010 Monty Taylor
5 
6  This program is free software; you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation; version 2 of the License.
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17  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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19  Copyright (C) 1995-2006 International Business Machines Corporation and others
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45 */
46 
47 #pragma once
48 
49 #include <string>
50 
51 #include <drizzled/utf8/checked.h>
52 #include <drizzled/utf8/unchecked.h>
53 
54 namespace drizzled
55 {
56 namespace utf8
57 {
58 
62 static const int MAX_LENGTH= 4;
63 
69 template <class T>
70 bool is_single(T c)
71 {
72  return (static_cast<uint8_t>(c) & 0x80) == 0;
73 }
74 
81 static inline int codepoint_length(uint32_t c)
82 {
83  return (c <= 0x7f ? 1 :
84  (c <= 0x7ff ? 2 :
85  (c <= 0xd7ff ? 3 :
86  (c <= 0xdfff || c>0x10ffff ? 0 :
87  (c <= 0xffff ? 3 : 4)))));
88 }
89 
96 template <class T>
97 int sequence_length(T c)
98 {
99  return (static_cast<uint8_t>(c) < 0x80 ? 1 :
100  ((static_cast<uint8_t>(c) >> 5) == 0x6 ? 2 :
101  ((static_cast<uint8_t>(c) >> 4) == 0xe ? 3 :
102  ((static_cast<uint8_t>(c) >> 3) == 0x1e ? 4 : 0))));
103 }
104 
105 
112 static inline uint32_t char_length(const std::string &in_string)
113 {
114  uint32_t length= 0;
115  int seq_length= 0;
116  std::string::const_iterator iter= in_string.begin();
117  while (iter < in_string.end())
118  {
119  length++;
120  seq_length= sequence_length(*iter);
121  iter += (seq_length > 0) ? seq_length : 1;
122  }
123  return length;
124 }
125 
132 static inline uint32_t char_length(const char *in_string)
133 {
134  const std::string process_string(in_string);
135  return char_length(process_string);
136 }
137 
138 
139 } /* namespace utf8 */
140 } /* namespace drizzled */
141