Dogcows Code - chaz/openbox/blob - otk/ustring.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #ifdef    HAVE_CONFIG_H
   4 #  include "../config.h"
   5 #endif // HAVE_CONFIG_H
   6
   7 #include "ustring.hh"
   8
   9 extern "C" {
  10 #include <assert.h>
  11 }
  12
  13 namespace otk {
  14
  15 // helper functions
  16
  17 static ustring::size_type utf8_find_offset(const char *str, const char *pos)
  18 {
  19   ustring::size_type offset = 0;
  20
  21   while (str < pos) {
  22     str += g_utf8_skip[*str];
  23     offset += g_utf8_skip[*str];
  24   }
  25
  26   return offset;
  27 }
  28
  29 // First overload: stop on '\0' character.
  30 ustring::size_type utf8_byte_offset(const char* str, ustring::size_type offset)
  31 {
  32   if(offset == ustring::npos)
  33     return ustring::npos;
  34
  35   const char* p = str;
  36
  37   for(; offset != 0; --offset)
  38   {
  39     if(*p == '\0')
  40       return ustring::npos;
  41
  42     p += g_utf8_skip[*p];
  43   }
  44
  45   return (p - str);
  46 }
  47
  48 // Second overload: stop when reaching maxlen.
  49 ustring::size_type utf8_byte_offset(const char* str, ustring::size_type offset,
  50                                     ustring::size_type maxlen)
  51 {
  52   if(offset == ustring::npos)
  53     return ustring::npos;
  54
  55   const char *const pend = str + maxlen;
  56   const char* p = str;
  57
  58   for(; offset != 0; --offset)
  59   {
  60     if(p >= pend)
  61       return ustring::npos;
  62
  63     p += g_utf8_skip[*p];
  64   }
  65
  66   return (p - str);
  67 }
  68
  69
  70 // ustring methods
  71
  72 ustring::ustring()
  73 {
  74 }
  75
  76 ustring::~ustring()
  77 {
  78 }
  79
  80 ustring::ustring(const ustring& other)
  81   : _string(other._string), _utf8(other._utf8)
  82 {
  83 }
  84
  85 ustring& ustring::operator=(const ustring& other)
  86 {
  87   _string = other._string;
  88   _utf8 = other._utf8;
  89   return *this;
  90 }
  91
  92 ustring::ustring(const std::string& src)
  93   : _string(src), _utf8(true)
  94 {
  95 }
  96
  97 ustring::ustring(const char* src)
  98   : _string(src), _utf8(true)
  99 {
 100 }
 101
 102 ustring& ustring::operator+=(const ustring& src)
 103 {
 104   assert(_utf8 == src._utf8);
 105   _string += src._string;
 106   return *this;
 107 }
 108
 109 ustring& ustring::operator+=(const char* src)
 110 {
 111   _string += src;
 112   return *this;
 113 }
 114
 115 ustring& ustring::operator+=(char c)
 116 {
 117   _string += c;
 118   return *this;
 119 }
 120
 121 ustring::size_type ustring::size() const
 122 {
 123   if (_utf8) {
 124     const char *const pdata = _string.data();
 125     return utf8_find_offset(pdata, pdata + _string.size());
 126   } else
 127     return _string.size();
 128 }
 129
 130 ustring::size_type ustring::bytes() const
 131 {
 132   return _string.size();
 133 }
 134
 135 ustring::size_type ustring::capacity() const
 136 {
 137   return _string.capacity();
 138 }
 139
 140 ustring::size_type ustring::max_size() const
 141 {
 142   return _string.max_size();
 143 }
 144
 145 void ustring::clear()
 146 {
 147   _string.erase();
 148 }
 149
 150 ustring& ustring::erase(ustring::size_type i, ustring::size_type n)
 151 {
 152   if (_utf8) {
 153     // find a proper offset
 154     size_type utf_i = utf8_byte_offset(_string.c_str(), i);
 155     if (utf_i != npos) {
 156       // if the offset is not npos, find a proper length for 'n'
 157       size_type utf_n = utf8_byte_offset(_string.data() + utf_i, n,
 158                                          _string.size() - utf_i);
 159       _string.erase(utf_i, utf_n);
 160     }
 161   } else
 162     _string.erase(i, n);
 163
 164   return *this;
 165 }
 166
 167 void ustring::resize(ustring::size_type n, char c)
 168 {
 169   if (_utf8) {
 170     const size_type size_now = size();
 171     if(n < size_now)
 172       erase(n, npos);
 173     else if(n > size_now)
 174       _string.append(n - size_now, c);
 175   } else
 176     _string.resize(n, c);
 177 }
 178
 179 const char* ustring::data() const
 180 {
 181   return _string.data();
 182 }
 183
 184 const char* ustring::c_str() const
 185 {
 186   return _string.c_str();
 187 }
 188
 189 bool ustring::utf8() const
 190 {
 191   return _utf8;
 192 }
 193
 194 void ustring::setUtf8(bool utf8)
 195 {
 196   _utf8 = utf8;
 197 }
 198
 199 }