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

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 #ifndef   __ustring_hh
   3 #define   __ustring_hh
   4
   5 /*! @file ustring.hh
   6   @brief Provides a simple UTF-8 encoded string
   7 */
   8
   9 extern "C" {
  10
  11 #ifdef HAVE_STDINT_H
  12 #  include <stdint.h>
  13 #else
  14 #  ifdef HAVE_SYS_TYPES_H
  15 #    include <sys/types.h>
  16 #  endif
  17 #endif
  18
  19 }
  20
  21 #include <string>
  22
  23 namespace otk {
  24
  25
  26 #ifdef HAVE_STDINT_H
  27 typedef uint32_t unichar;
  28 #else
  29 typedef u_int32_t unichar;
  30 #endif
  31
  32
  33 #ifndef DOXYGEN_IGNORE
  34
  35 //! The number of bytes to skip to find the next character in the string
  36 const char utf8_skip[256] = {
  37   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  38   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  39   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  40   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  41   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  42   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  43   2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
  44   3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1
  45 };
  46
  47 unichar utf8_get_char(const char *p);
  48
  49 #endif // DOXYGEN_IGNORE
  50
  51 //! The iterator type for ustring
  52 /*!
  53   Note this is not a random access iterator but a bidirectional one, since all
  54   index operations need to iterate over the UTF-8 data.  Use std::advance() to
  55   move to a certain position.
  56   <p>
  57   A writeable iterator isn't provided because:  The number of bytes of the old
  58   UTF-8 character and the new one to write could be different. Therefore, any
  59   write operation would invalidate all other iterators pointing into the same
  60   string.
  61 */
  62
  63 template <class T>
  64 class ustring_Iterator
  65 {
  66 public:
  67   typedef std::bidirectional_iterator_tag   iterator_category;
  68   typedef unichar                           value_type;
  69   typedef std::string::difference_type      difference_type;
  70   //typedef value_type                        reference;
  71   typedef void                              pointer;
  72
  73   inline ustring_Iterator() {}
  74   inline ustring_Iterator(const ustring_Iterator<std::string::iterator>&
  75                           other) : _pos(other.base()) {}
  76
  77
  78   inline value_type operator*() const {
  79     // get an iterator to the internal string
  80     std::string::const_iterator pos = _pos;
  81     return utf8_get_char(&(*pos));
  82   }
  83
  84
  85   inline ustring_Iterator<T> &     operator++() {
  86     pos_ += g_utf8_skip[static_cast<unsigned char>(*pos_)];
  87     return *this;
  88   }
  89   inline ustring_Iterator<T> &     operator--() {
  90     do { --_pos; } while((*_pos & '\xC0') == '\x80');
  91     return *this;
  92   }
  93
  94   explicit inline ustring_Iterator(T pos) : _pos(pos) {}
  95   inline T base() const { return _pos; }
  96
  97 private:
  98   T _pos;
  99 };
 100
 101
 102 //! This class provides a simple wrapper to a std::string that can be encoded
 103 //! as UTF-8. The ustring::utf() member specifies if the given string is UTF-8
 104 //! encoded. ustrings default to specifying UTF-8 encoding.
 105 /*!
 106   This class does <b>not</b> handle extended 8-bit ASCII charsets like
 107   ISO-8859-1.
 108   <p>
 109   More info on Unicode and UTF-8 can be found here:
 110   http://www.cl.cam.ac.uk/~mgk25/unicode.html
 111   <p>
 112   This does not subclass std::string, because std::string was intended to be a
 113   final class.  For instance, it does not have a virtual destructor.
 114 */
 115 class ustring {
 116   std::string _string;
 117   bool _utf8;
 118
 119 public:
 120   typedef std::string::size_type                        size_type;
 121   typedef std::string::difference_type                  difference_type;
 122
 123   typedef unichar                                       value_type;
 124   //typedef unichar &                                     reference;
 125   //typedef const unichar &                               const_reference;
 126
 127   //typedef ustring_Iterator<std::string::iterator>       iterator;
 128   //typedef ustring_Iterator<std::string::const_iterator> const_iterator;
 129
 130   static const size_type npos = std::string::npos;
 131
 132   ustring();
 133   ~ustring();
 134
 135   // make new strings
 136
 137   ustring(const ustring& other);
 138   ustring& operator=(const ustring& other);
 139   ustring(const std::string& src);
 140   ustring(const char* src);
 141
 142   // append to the string
 143
 144   ustring& operator+=(const ustring& src);
 145   ustring& operator+=(const char* src);
 146   ustring& operator+=(char c);
 147
 148   // sizes
 149
 150   ustring::size_type size() const;
 151   ustring::size_type bytes() const;
 152   ustring::size_type capacity() const;
 153   ustring::size_type max_size() const;
 154   bool empty() const;
 155
 156   // erase substrings
 157
 158   void clear();
 159   ustring& erase(size_type i, size_type n=npos);
 160
 161   // change the string's size
 162
 163   void resize(size_type n, char c='\0');
 164
 165   // extract characters
 166
 167   // No reference return; use replace() to write characters.
 168   value_type operator[](size_type i) const;
 169
 170   // internal data
 171
 172   const char* data()  const;
 173   const char* c_str() const;
 174
 175   // encoding
 176
 177   bool utf8() const;
 178   void setUtf8(bool utf8);
 179 };
 180
 181 }
 182
 183 #endif // __ustring_hh