include/wx/string.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        string.h
   3 // Purpose:     wxString and wxArrayString classes
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 /*
  13     Efficient string class [more or less] compatible with MFC CString,
  14     wxWindows version 1 wxString and std::string and some handy functions
  15     missing from string.h.
  16 */
  17
  18 #ifndef _WX_WXSTRINGH__
  19 #define _WX_WXSTRINGH__
  20
  21 #ifdef __GNUG__
  22     #pragma interface "string.h"
  23 #endif
  24
  25 // ----------------------------------------------------------------------------
  26 // conditinal compilation
  27 // ----------------------------------------------------------------------------
  28
  29 // compile the std::string compatibility functions if defined
  30 #define   wxSTD_STRING_COMPATIBILITY
  31
  32 // ----------------------------------------------------------------------------
  33 // headers
  34 // ----------------------------------------------------------------------------
  35
  36 #include "wx/defs.h"        // everybody should include this
  37
  38 #if defined(__WXMAC__) || defined(__VISAGECPP__)
  39     #include <ctype.h>
  40 #endif
  41
  42 #ifdef __EMX__
  43     #include <std.h>
  44 #endif
  45
  46 #if defined(__VISAGECPP__) && __IBMCPP__ >= 400
  47    // problem in VACPP V4 with including stdlib.h multiple times
  48    // strconv includes it anyway
  49 #  include <stdio.h>
  50 #  include <string.h>
  51 #  include <stdarg.h>
  52 #  include <limits.h>
  53 #else
  54 #  include <string.h>
  55 #  include <stdio.h>
  56 #  include <stdarg.h>
  57 #  include <limits.h>
  58 #  include <stdlib.h>
  59 #endif
  60
  61 #ifdef HAVE_STRINGS_H
  62     #include <strings.h>    // for strcasecmp()
  63 #endif // HAVE_STRINGS_H
  64
  65 #include "wx/wxchar.h"      // for wxChar
  66 #include "wx/buffer.h"      // for wxCharBuffer
  67 #include "wx/strconv.h"     // for wxConvertXXX() macros and wxMBConv classes
  68
  69 // ---------------------------------------------------------------------------
  70 // macros
  71 // ---------------------------------------------------------------------------
  72
  73 // casts [unfortunately!] needed to call some broken functions which require
  74 // "char *" instead of "const char *"
  75 #define   WXSTRINGCAST (wxChar *)(const wxChar *)
  76 #define   wxCSTRINGCAST (wxChar *)(const wxChar *)
  77 #define   wxMBSTRINGCAST (char *)(const char *)
  78 #define   wxWCSTRINGCAST (wchar_t *)(const wchar_t *)
  79
  80 // implementation only
  81 #define   wxASSERT_VALID_INDEX(i) \
  82     wxASSERT_MSG( (size_t)(i) <= Len(), _T("invalid index in wxString") )
  83
  84 // ----------------------------------------------------------------------------
  85 // constants
  86 // ----------------------------------------------------------------------------
  87
  88 #if defined(__VISAGECPP__) && __IBMCPP__ >= 400
  89 // must define this static for VA or else you get multiply defined symbols everywhere
  90 extern const unsigned int wxSTRING_MAXLEN;
  91
  92 #else
  93 // maximum possible length for a string means "take all string" everywhere
  94 //  (as sizeof(StringData) is unknown here, we substract 100)
  95 const unsigned int wxSTRING_MAXLEN = UINT_MAX - 100;
  96
  97 #endif
  98
  99 // ----------------------------------------------------------------------------
 100 // global data
 101 // ----------------------------------------------------------------------------
 102
 103 // global pointer to empty string
 104 WXDLLEXPORT_DATA(extern const wxChar*) wxEmptyString;
 105
 106 // ---------------------------------------------------------------------------
 107 // global functions complementing standard C string library replacements for
 108 // strlen() and portable strcasecmp()
 109 //---------------------------------------------------------------------------
 110
 111 // Use wxXXX() functions from wxchar.h instead! These functions are for
 112 // backwards compatibility only.
 113
 114 // checks whether the passed in pointer is NULL and if the string is empty
 115 inline bool IsEmpty(const char *p) { return (!p || !*p); }
 116
 117 // safe version of strlen() (returns 0 if passed NULL pointer)
 118 inline size_t Strlen(const char *psz)
 119   { return psz ? strlen(psz) : 0; }
 120
 121 // portable strcasecmp/_stricmp
 122 inline int Stricmp(const char *psz1, const char *psz2)
 123 {
 124 #if defined(__VISUALC__) || ( defined(__MWERKS__) && defined(__INTEL__) )
 125   return _stricmp(psz1, psz2);
 126 #elif defined(__SC__)
 127   return _stricmp(psz1, psz2);
 128 #elif defined(__SALFORDC__)
 129   return stricmp(psz1, psz2);
 130 #elif defined(__BORLANDC__)
 131   return stricmp(psz1, psz2);
 132 #elif defined(__WATCOMC__)
 133   return stricmp(psz1, psz2);
 134 #elif defined(__DJGPP__)
 135   return stricmp(psz1, psz2);
 136 #elif defined(__EMX__)
 137   return stricmp(psz1, psz2);
 138 #elif defined(__WXPM__)
 139   return stricmp(psz1, psz2);
 140 #elif defined(__UNIX__) || defined(__GNUWIN32__)
 141   return strcasecmp(psz1, psz2);
 142 #elif defined(__MWERKS__) && !defined(__INTEL__)
 143   register char c1, c2;
 144   do {
 145     c1 = tolower(*psz1++);
 146     c2 = tolower(*psz2++);
 147   } while ( c1 && (c1 == c2) );
 148
 149   return c1 - c2;
 150 #else
 151   // almost all compilers/libraries provide this function (unfortunately under
 152   // different names), that's why we don't implement our own which will surely
 153   // be more efficient than this code (uncomment to use):
 154   /*
 155     register char c1, c2;
 156     do {
 157       c1 = tolower(*psz1++);
 158       c2 = tolower(*psz2++);
 159     } while ( c1 && (c1 == c2) );
 160
 161     return c1 - c2;
 162   */
 163
 164   #error  "Please define string case-insensitive compare for your OS/compiler"
 165 #endif  // OS/compiler
 166 }
 167
 168 // return an empty wxString
 169 class WXDLLEXPORT wxString; // not yet defined
 170 inline const wxString& wxGetEmptyString() { return *(wxString *)&wxEmptyString; }
 171
 172 // ---------------------------------------------------------------------------
 173 // string data prepended with some housekeeping info (used by wxString class),
 174 // is never used directly (but had to be put here to allow inlining)
 175 // ---------------------------------------------------------------------------
 176
 177 struct WXDLLEXPORT wxStringData
 178 {
 179   int     nRefs;        // reference count
 180   size_t  nDataLength,  // actual string length
 181           nAllocLength; // allocated memory size
 182
 183   // mimics declaration 'wxChar data[nAllocLength]'
 184   wxChar* data() const { return (wxChar*)(this + 1); }
 185
 186   // empty string has a special ref count so it's never deleted
 187   bool  IsEmpty()   const { return (nRefs == -1); }
 188   bool  IsShared()  const { return (nRefs > 1);   }
 189
 190   // lock/unlock
 191   void  Lock()   { if ( !IsEmpty() ) nRefs++;                    }
 192
 193   // VC++ will refuse to inline this function but profiling shows that it
 194   // is wrong
 195 #if defined(__VISUALC__) && (__VISUALC__ >= 1200)
 196   __forceinline
 197 #endif
 198   void  Unlock() { if ( !IsEmpty() && --nRefs == 0) free(this);  }
 199
 200   // if we had taken control over string memory (GetWriteBuf), it's
 201   // intentionally put in invalid state
 202   void  Validate(bool b)  { nRefs = (b ? 1 : 0); }
 203   bool  IsValid() const   { return (nRefs != 0); }
 204 };
 205
 206 // ---------------------------------------------------------------------------
 207 // This is (yet another one) String class for C++ programmers. It doesn't use
 208 // any of "advanced" C++ features (i.e. templates, exceptions, namespaces...)
 209 // thus you should be able to compile it with practicaly any C++ compiler.
 210 // This class uses copy-on-write technique, i.e. identical strings share the
 211 // same memory as long as neither of them is changed.
 212 //
 213 // This class aims to be as compatible as possible with the new standard
 214 // std::string class, but adds some additional functions and should be at
 215 // least as efficient than the standard implementation.
 216 //
 217 // Performance note: it's more efficient to write functions which take "const
 218 // String&" arguments than "const char *" if you assign the argument to
 219 // another string.
 220 //
 221 // It was compiled and tested under Win32, Linux (libc 5 & 6), Solaris 5.5.
 222 //
 223 // To do:
 224 //  - ressource support (string tables in ressources)
 225 //  - more wide character (UNICODE) support
 226 //  - regular expressions support
 227 // ---------------------------------------------------------------------------
 228
 229 class WXDLLEXPORT wxString
 230 {
 231 friend class WXDLLEXPORT wxArrayString;
 232
 233   // NB: special care was taken in arranging the member functions in such order
 234   //     that all inline functions can be effectively inlined, verify that all
 235   //     performace critical functions are still inlined if you change order!
 236 private:
 237   // points to data preceded by wxStringData structure with ref count info
 238   wxChar *m_pchData;
 239
 240   // accessor to string data
 241   wxStringData* GetStringData() const { return (wxStringData*)m_pchData - 1; }
 242
 243   // string (re)initialization functions
 244     // initializes the string to the empty value (must be called only from
 245     // ctors, use Reinit() otherwise)
 246   void Init() { m_pchData = (wxChar *)wxEmptyString; }
 247     // initializaes the string with (a part of) C-string
 248   void InitWith(const wxChar *psz, size_t nPos = 0, size_t nLen = wxSTRING_MAXLEN);
 249     // as Init, but also frees old data
 250   void Reinit() { GetStringData()->Unlock(); Init(); }
 251
 252   // memory allocation
 253     // allocates memory for string of length nLen
 254   bool AllocBuffer(size_t nLen);
 255     // copies data to another string
 256   bool AllocCopy(wxString&, int, int) const;
 257     // effectively copies data to string
 258   bool AssignCopy(size_t, const wxChar *);
 259
 260   // append a (sub)string
 261   bool ConcatSelf(int nLen, const wxChar *src);
 262
 263   // functions called before writing to the string: they copy it if there
 264   // are other references to our data (should be the only owner when writing)
 265   bool CopyBeforeWrite();
 266   bool AllocBeforeWrite(size_t);
 267
 268   // if we hadn't made these operators private, it would be possible to
 269   // compile "wxString s; s = 17;" without any warnings as 17 is implicitly
 270   // converted to char in C and we do have operator=(char)
 271   //
 272   // NB: we don't need other versions (short/long and unsigned) as attempt
 273   //     to assign another numeric type to wxString will now result in
 274   //     ambiguity between operator=(char) and operator=(int)
 275   wxString& operator=(int);
 276
 277   // these methods are not implemented - there is _no_ conversion from int to
 278   // string, you're doing something wrong if the compiler wants to call it!
 279   //
 280   // try `s << i' or `s.Printf("%d", i)' instead
 281   wxString(int);
 282
 283 public:
 284   // constructors and destructor
 285     // ctor for an empty string
 286   wxString() : m_pchData(NULL) { Init(); }
 287     // copy ctor
 288   wxString(const wxString& stringSrc) : m_pchData(NULL)
 289   {
 290     wxASSERT_MSG( stringSrc.GetStringData()->IsValid(),
 291                   _T("did you forget to call UngetWriteBuf()?") );
 292
 293     if ( stringSrc.IsEmpty() ) {
 294       // nothing to do for an empty string
 295       Init();
 296     }
 297     else {
 298       m_pchData = stringSrc.m_pchData;            // share same data
 299       GetStringData()->Lock();                    // => one more copy
 300     }
 301   }
 302     // string containing nRepeat copies of ch
 303   wxString(wxChar ch, size_t nRepeat = 1);
 304     // ctor takes first nLength characters from C string
 305     // (default value of wxSTRING_MAXLEN means take all the string)
 306   wxString(const wxChar *psz, size_t nLength = wxSTRING_MAXLEN)
 307       : m_pchData(NULL)
 308       { InitWith(psz, 0, nLength); }
 309   wxString(const wxChar *psz, wxMBConv& WXUNUSED(conv), size_t nLength = wxSTRING_MAXLEN)
 310       : m_pchData(NULL)
 311       { InitWith(psz, 0, nLength); }
 312
 313 #if wxUSE_UNICODE
 314     // from multibyte string
 315     // (NB: nLength is right now number of Unicode characters, not
 316     //  characters in psz! So try not to use it yet!)
 317   wxString(const char *psz, wxMBConv& conv = wxConvLibc, size_t nLength = wxSTRING_MAXLEN);
 318     // from wxWCharBuffer (i.e. return from wxGetString)
 319   wxString(const wxWCharBuffer& psz)
 320     { InitWith(psz, 0, wxSTRING_MAXLEN); }
 321 #else // ANSI
 322     // from C string (for compilers using unsigned char)
 323   wxString(const unsigned char* psz, size_t nLength = wxSTRING_MAXLEN)
 324       : m_pchData(NULL)
 325       { InitWith((const char*)psz, 0, nLength); }
 326
 327 #if wxUSE_WCHAR_T
 328     // from wide (Unicode) string
 329   wxString(const wchar_t *pwz, wxMBConv& conv = wxConvLibc, size_t nLength = wxSTRING_MAXLEN);
 330 #endif // !wxUSE_WCHAR_T
 331
 332     // from wxCharBuffer
 333   wxString(const wxCharBuffer& psz)
 334       : m_pchData(NULL)
 335       { InitWith(psz, 0, wxSTRING_MAXLEN); }
 336 #endif // Unicode/ANSI
 337
 338     // dtor is not virtual, this class must not be inherited from!
 339  ~wxString() { GetStringData()->Unlock(); }
 340
 341   // generic attributes & operations
 342     // as standard strlen()
 343   size_t Len() const { return GetStringData()->nDataLength; }
 344     // string contains any characters?
 345   bool IsEmpty() const { return Len() == 0; }
 346     // empty string is "FALSE", so !str will return TRUE
 347   bool operator!() const { return IsEmpty(); }
 348     // truncate the string to given length
 349   wxString& Truncate(size_t uiLen);
 350     // empty string contents
 351   void Empty()
 352   {
 353     Truncate(0);
 354
 355     wxASSERT_MSG( IsEmpty(), _T("string not empty after call to Empty()?") );
 356   }
 357     // empty the string and free memory
 358   void Clear()
 359   {
 360     if ( !GetStringData()->IsEmpty() )
 361       Reinit();
 362
 363     wxASSERT_MSG( !GetStringData()->nDataLength &&
 364                   !GetStringData()->nAllocLength,
 365                   _T("string should be empty after Clear()") );
 366   }
 367
 368   // contents test
 369     // Is an ascii value
 370   bool IsAscii() const;
 371     // Is a number
 372   bool IsNumber() const;
 373     // Is a word
 374   bool IsWord() const;
 375
 376   // data access (all indexes are 0 based)
 377     // read access
 378     wxChar  GetChar(size_t n) const
 379       { wxASSERT_VALID_INDEX( n );  return m_pchData[n]; }
 380     // read/write access
 381     wxChar& GetWritableChar(size_t n)
 382       { wxASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 383     // write access
 384     void  SetChar(size_t n, wxChar ch)
 385       { wxASSERT_VALID_INDEX( n ); CopyBeforeWrite(); m_pchData[n] = ch; }
 386
 387     // get last character
 388     wxChar  Last() const
 389       {
 390           wxASSERT_MSG( !IsEmpty(), _T("wxString: index out of bounds") );
 391
 392           return m_pchData[Len() - 1];
 393       }
 394
 395     // get writable last character
 396     wxChar& Last()
 397       {
 398           wxASSERT_MSG( !IsEmpty(), _T("wxString: index out of bounds") );
 399           CopyBeforeWrite();
 400           return m_pchData[Len()-1];
 401       }
 402
 403     /*
 404         So why do we have all these overloaded operator[]s? A bit of history:
 405         initially there was only one of them, taking size_t. Then people
 406         started complaining because they wanted to use ints as indices (I
 407         wonder why) and compilers were giving warnings about it, so we had to
 408         add the operator[](int). Then it became apparent that you couldn't
 409         write str[0] any longer because there was ambiguity between two
 410         overloads and so you now had to write str[0u] (or, of course, use the
 411         explicit casts to either int or size_t but nobody did this).
 412
 413         Finally, someone decided to compile wxWin on an Alpha machine and got
 414         a surprize: str[0u] didn't compile there because it is of type
 415         unsigned int and size_t is unsigned _long_ on Alpha and so there was
 416         ambiguity between converting uint to int or ulong. To fix this one we
 417         now add operator[](uint) for the machines where size_t is not already
 418         the same as unsigned int - hopefully this fixes the problem (for some
 419         time)
 420
 421         The only real fix is, of course, to remove all versions but the one
 422         taking size_t...
 423      */
 424
 425     // operator version of GetChar
 426     wxChar  operator[](size_t n) const
 427       { wxASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 428
 429     // operator version of GetChar
 430     wxChar  operator[](int n) const
 431       { wxASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 432
 433     // operator version of GetWriteableChar
 434     wxChar& operator[](size_t n)
 435       { wxASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 436
 437 #ifndef wxSIZE_T_IS_UINT
 438     // operator version of GetChar
 439     wxChar operator[](unsigned int n) const
 440       { wxASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 441
 442     // operator version of GetWriteableChar
 443     wxChar& operator[](unsigned int n)
 444       { wxASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 445 #endif // size_t != unsigned int
 446
 447     // implicit conversion to C string
 448     operator const wxChar*() const { return m_pchData; }
 449
 450     // explicit conversion to C string (use this with printf()!)
 451     const wxChar* c_str()   const { return m_pchData; }
 452     // identical to c_str(), for wxWin 1.6x compatibility
 453     const wxChar* wx_str()  const { return m_pchData; }
 454     // identical to c_str(), for MFC compatibility
 455     const wxChar* GetData() const { return m_pchData; }
 456
 457     // conversion to/from plain (i.e. 7 bit) ASCII: this is useful for
 458     // converting numbers or strings which are certain not to contain special
 459     // chars (typically system functions, X atoms, environment variables etc.)
 460     //
 461     // the behaviour of these functions with the strings containing anything
 462     // else than 7 bit ASCII characters is undefined, use at your own risk.
 463 #if wxUSE_UNICODE
 464     static wxString FromAscii(const char *ascii);
 465     const wxCharBuffer ToAscii() const;
 466 #else // ANSI
 467     static wxString FromAscii(const char *ascii) { return wxString( ascii ); }
 468     const char *ToAscii() const { return c_str(); }
 469 #endif // Unicode/!Unicode
 470
 471     // conversions with (possible) format convertions: have to return a
 472     // buffer with temporary data
 473     //
 474     // the functions defined (in either Unicode or ANSI) mode are mb_str() to
 475     // return an ANSI (multibyte) string, wc_str() to return a wide string and
 476     // fn_str() to return a string which should be used with the OS APIs
 477     // accepting the file names. The return value is always the same, but the
 478     // type differs because a function may either return pointer to the buffer
 479     // directly or have to use intermediate buffer for translation.
 480 #if wxUSE_UNICODE
 481     const wxCharBuffer mb_str(wxMBConv& conv = wxConvLibc) const
 482         { return conv.cWC2MB(m_pchData); }
 483
 484     const wxWX2MBbuf mbc_str() const { return mb_str(*wxConvCurrent); }
 485
 486     const wxChar* wc_str() const { return m_pchData; }
 487
 488     // for compatibility with !wxUSE_UNICODE version
 489     const wxChar* wc_str(wxMBConv& WXUNUSED(conv)) const { return m_pchData; }
 490
 491 #if wxMBFILES
 492     const wxCharBuffer fn_str() const { return mb_str(wxConvFile); }
 493 #else // !wxMBFILES
 494     const wxChar* fn_str() const { return m_pchData; }
 495 #endif // wxMBFILES/!wxMBFILES
 496 #else // ANSI
 497     const wxChar* mb_str() const { return m_pchData; }
 498
 499     // for compatibility with wxUSE_UNICODE version
 500     const wxChar* mb_str(wxMBConv& WXUNUSED(conv)) const { return m_pchData; }
 501
 502     const wxWX2MBbuf mbc_str() const { return mb_str(); }
 503
 504 #if wxUSE_WCHAR_T
 505     const wxWCharBuffer wc_str(wxMBConv& conv) const
 506         { return conv.cMB2WC(m_pchData); }
 507 #endif // wxUSE_WCHAR_T
 508
 509     const wxChar* fn_str() const { return m_pchData; }
 510 #endif // Unicode/ANSI
 511
 512   // overloaded assignment
 513     // from another wxString
 514   wxString& operator=(const wxString& stringSrc);
 515     // from a character
 516   wxString& operator=(wxChar ch);
 517     // from a C string
 518   wxString& operator=(const wxChar *psz);
 519 #if wxUSE_UNICODE
 520     // from wxWCharBuffer
 521   wxString& operator=(const wxWCharBuffer& psz)
 522   { (void) operator=((const wchar_t *)psz); return *this; }
 523 #else // ANSI
 524     // from another kind of C string
 525   wxString& operator=(const unsigned char* psz);
 526 #if wxUSE_WCHAR_T
 527     // from a wide string
 528   wxString& operator=(const wchar_t *pwz);
 529 #endif
 530     // from wxCharBuffer
 531   wxString& operator=(const wxCharBuffer& psz)
 532   { (void) operator=((const char *)psz); return *this; }
 533 #endif // Unicode/ANSI
 534
 535   // string concatenation
 536     // in place concatenation
 537     /*
 538         Concatenate and return the result. Note that the left to right
 539         associativity of << allows to write things like "str << str1 << str2
 540         << ..." (unlike with +=)
 541      */
 542       // string += string
 543   wxString& operator<<(const wxString& s)
 544   {
 545     wxASSERT_MSG( s.GetStringData()->IsValid(),
 546                   _T("did you forget to call UngetWriteBuf()?") );
 547
 548     ConcatSelf(s.Len(), s);
 549     return *this;
 550   }
 551       // string += C string
 552   wxString& operator<<(const wxChar *psz)
 553     { ConcatSelf(wxStrlen(psz), psz); return *this; }
 554       // string += char
 555   wxString& operator<<(wxChar ch) { ConcatSelf(1, &ch); return *this; }
 556
 557       // string += string
 558   void operator+=(const wxString& s) { (void)operator<<(s); }
 559       // string += C string
 560   void operator+=(const wxChar *psz) { (void)operator<<(psz); }
 561       // string += char
 562   void operator+=(wxChar ch) { (void)operator<<(ch); }
 563
 564       // string += buffer (i.e. from wxGetString)
 565 #if wxUSE_UNICODE
 566   wxString& operator<<(const wxWCharBuffer& s)
 567     { (void)operator<<((const wchar_t *)s); return *this; }
 568   void operator+=(const wxWCharBuffer& s)
 569     { (void)operator<<((const wchar_t *)s); }
 570 #else // !wxUSE_UNICODE
 571   wxString& operator<<(const wxCharBuffer& s)
 572     { (void)operator<<((const char *)s); return *this; }
 573   void operator+=(const wxCharBuffer& s)
 574     { (void)operator<<((const char *)s); }
 575 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
 576
 577     // string += C string
 578   wxString& Append(const wxString& s)
 579     {
 580         // test for IsEmpty() to share the string if possible
 581         if ( IsEmpty() )
 582             *this = s;
 583         else
 584             ConcatSelf(s.Length(), s.c_str());
 585         return *this;
 586     }
 587   wxString& Append(const wxChar* psz)
 588     { ConcatSelf(wxStrlen(psz), psz); return *this; }
 589     // append count copies of given character
 590   wxString& Append(wxChar ch, size_t count = 1u)
 591     { wxString str(ch, count); return *this << str; }
 592   wxString& Append(const wxChar* psz, size_t nLen)
 593     { ConcatSelf(nLen, psz); return *this; }
 594
 595     // prepend a string, return the string itself
 596   wxString& Prepend(const wxString& str)
 597     { *this = str + *this; return *this; }
 598
 599     // non-destructive concatenation
 600       //
 601   friend wxString WXDLLEXPORT operator+(const wxString& string1,  const wxString& string2);
 602       //
 603   friend wxString WXDLLEXPORT operator+(const wxString& string, wxChar ch);
 604       //
 605   friend wxString WXDLLEXPORT operator+(wxChar ch, const wxString& string);
 606       //
 607   friend wxString WXDLLEXPORT operator+(const wxString& string, const wxChar *psz);
 608       //
 609   friend wxString WXDLLEXPORT operator+(const wxChar *psz, const wxString& string);
 610
 611   // stream-like functions
 612       // insert an int into string
 613   wxString& operator<<(int i)
 614     { return (*this) << Format(_T("%d"), i); }
 615       // insert an unsigned int into string
 616   wxString& operator<<(unsigned int ui)
 617     { return (*this) << Format(_T("%u"), ui); }
 618       // insert a long into string
 619   wxString& operator<<(long l)
 620     { return (*this) << Format(_T("%ld"), l); }
 621       // insert an unsigned long into string
 622   wxString& operator<<(unsigned long ul)
 623     { return (*this) << Format(_T("%lu"), ul); }
 624       // insert a float into string
 625   wxString& operator<<(float f)
 626     { return (*this) << Format(_T("%f"), f); }
 627       // insert a double into string
 628   wxString& operator<<(double d)
 629     { return (*this) << Format(_T("%g"), d); }
 630
 631   // string comparison
 632     // case-sensitive comparison (returns a value < 0, = 0 or > 0)
 633   int Cmp(const wxChar *psz) const { return wxStrcmp(c_str(), psz); }
 634     // same as Cmp() but not case-sensitive
 635   int CmpNoCase(const wxChar *psz) const { return wxStricmp(c_str(), psz); }
 636     // test for the string equality, either considering case or not
 637     // (if compareWithCase then the case matters)
 638   bool IsSameAs(const wxChar *psz, bool compareWithCase = TRUE) const
 639     { return (compareWithCase ? Cmp(psz) : CmpNoCase(psz)) == 0; }
 640     // comparison with a signle character: returns TRUE if equal
 641   bool IsSameAs(wxChar c, bool compareWithCase = TRUE) const
 642     {
 643       return (Len() == 1) && (compareWithCase ? GetChar(0u) == c
 644                               : wxToupper(GetChar(0u)) == wxToupper(c));
 645     }
 646
 647   // simple sub-string extraction
 648       // return substring starting at nFirst of length nCount (or till the end
 649       // if nCount = default value)
 650   wxString Mid(size_t nFirst, size_t nCount = wxSTRING_MAXLEN) const;
 651
 652       // operator version of Mid()
 653   wxString  operator()(size_t start, size_t len) const
 654     { return Mid(start, len); }
 655
 656       // check that the string starts with prefix and return the rest of the
 657       // string in the provided pointer if it is not NULL, otherwise return
 658       // FALSE
 659   bool StartsWith(const wxChar *prefix, wxString *rest = NULL) const;
 660
 661       // get first nCount characters
 662   wxString Left(size_t nCount) const;
 663       // get last nCount characters
 664   wxString Right(size_t nCount) const;
 665       // get all characters before the first occurance of ch
 666       // (returns the whole string if ch not found)
 667   wxString BeforeFirst(wxChar ch) const;
 668       // get all characters before the last occurence of ch
 669       // (returns empty string if ch not found)
 670   wxString BeforeLast(wxChar ch) const;
 671       // get all characters after the first occurence of ch
 672       // (returns empty string if ch not found)
 673   wxString AfterFirst(wxChar ch) const;
 674       // get all characters after the last occurence of ch
 675       // (returns the whole string if ch not found)
 676   wxString AfterLast(wxChar ch) const;
 677
 678     // for compatibility only, use more explicitly named functions above
 679   wxString Before(wxChar ch) const { return BeforeLast(ch); }
 680   wxString After(wxChar ch) const { return AfterFirst(ch); }
 681
 682   // case conversion
 683       // convert to upper case in place, return the string itself
 684   wxString& MakeUpper();
 685       // convert to upper case, return the copy of the string
 686       // Here's something to remember: BC++ doesn't like returns in inlines.
 687   wxString Upper() const ;
 688       // convert to lower case in place, return the string itself
 689   wxString& MakeLower();
 690       // convert to lower case, return the copy of the string
 691   wxString Lower() const ;
 692
 693   // trimming/padding whitespace (either side) and truncating
 694       // remove spaces from left or from right (default) side
 695   wxString& Trim(bool bFromRight = TRUE);
 696       // add nCount copies chPad in the beginning or at the end (default)
 697   wxString& Pad(size_t nCount, wxChar chPad = wxT(' '), bool bFromRight = TRUE);
 698
 699   // searching and replacing
 700       // searching (return starting index, or -1 if not found)
 701   int Find(wxChar ch, bool bFromEnd = FALSE) const;   // like strchr/strrchr
 702       // searching (return starting index, or -1 if not found)
 703   int Find(const wxChar *pszSub) const;               // like strstr
 704       // replace first (or all of bReplaceAll) occurences of substring with
 705       // another string, returns the number of replacements made
 706   size_t Replace(const wxChar *szOld,
 707                  const wxChar *szNew,
 708                  bool bReplaceAll = TRUE);
 709
 710     // check if the string contents matches a mask containing '*' and '?'
 711   bool Matches(const wxChar *szMask) const;
 712
 713     // conversion to numbers: all functions return TRUE only if the whole
 714     // string is a number and put the value of this number into the pointer
 715     // provided, the base is the numeric base in which the conversion should be
 716     // done and must be comprised between 2 and 36 or be 0 in which case the
 717     // standard C rules apply (leading '0' => octal, "0x" => hex)
 718         // convert to a signed integer
 719     bool ToLong(long *val, int base = 10) const;
 720         // convert to an unsigned integer
 721     bool ToULong(unsigned long *val, int base = 10) const;
 722         // convert to a double
 723     bool ToDouble(double *val) const;
 724
 725   // formated input/output
 726     // as sprintf(), returns the number of characters written or < 0 on error
 727     // (take 'this' into account in attribute parameter count)
 728   int Printf(const wxChar *pszFormat, ...) ATTRIBUTE_PRINTF_2;
 729     // as vprintf(), returns the number of characters written or < 0 on error
 730   int PrintfV(const wxChar* pszFormat, va_list argptr);
 731
 732     // returns the string containing the result of Printf() to it
 733   static wxString Format(const wxChar *pszFormat, ...) ATTRIBUTE_PRINTF_1;
 734     // the same as above, but takes a va_list
 735   static wxString FormatV(const wxChar *pszFormat, va_list argptr);
 736
 737   // raw access to string memory
 738     // ensure that string has space for at least nLen characters
 739     // only works if the data of this string is not shared
 740   bool Alloc(size_t nLen);
 741     // minimize the string's memory
 742     // only works if the data of this string is not shared
 743   bool Shrink();
 744     // get writable buffer of at least nLen bytes. Unget() *must* be called
 745     // a.s.a.p. to put string back in a reasonable state!
 746   wxChar *GetWriteBuf(size_t nLen);
 747     // call this immediately after GetWriteBuf() has been used
 748   void UngetWriteBuf();
 749   void UngetWriteBuf(size_t nLen);
 750
 751   // wxWindows version 1 compatibility functions
 752
 753   // use Mid()
 754   wxString SubString(size_t from, size_t to) const
 755       { return Mid(from, (to - from + 1)); }
 756     // values for second parameter of CompareTo function
 757   enum caseCompare {exact, ignoreCase};
 758     // values for first parameter of Strip function
 759   enum stripType {leading = 0x1, trailing = 0x2, both = 0x3};
 760
 761   // use Printf()
 762   // (take 'this' into account in attribute parameter count)
 763   int sprintf(const wxChar *pszFormat, ...) ATTRIBUTE_PRINTF_2;
 764
 765     // use Cmp()
 766   inline int CompareTo(const wxChar* psz, caseCompare cmp = exact) const
 767     { return cmp == exact ? Cmp(psz) : CmpNoCase(psz); }
 768
 769     // use Len
 770   size_t Length() const { return Len(); }
 771     // Count the number of characters
 772   int Freq(wxChar ch) const;
 773     // use MakeLower
 774   void LowerCase() { MakeLower(); }
 775     // use MakeUpper
 776   void UpperCase() { MakeUpper(); }
 777     // use Trim except that it doesn't change this string
 778   wxString Strip(stripType w = trailing) const;
 779
 780     // use Find (more general variants not yet supported)
 781   size_t Index(const wxChar* psz) const { return Find(psz); }
 782   size_t Index(wxChar ch)         const { return Find(ch);  }
 783     // use Truncate
 784   wxString& Remove(size_t pos) { return Truncate(pos); }
 785   wxString& RemoveLast(size_t n = 1) { return Truncate(Len() - n); }
 786
 787   wxString& Remove(size_t nStart, size_t nLen) { return erase( nStart, nLen ); }
 788
 789     // use Find()
 790   int First( const wxChar ch ) const { return Find(ch); }
 791   int First( const wxChar* psz ) const { return Find(psz); }
 792   int First( const wxString &str ) const { return Find(str); }
 793   int Last( const wxChar ch ) const { return Find(ch, TRUE); }
 794   bool Contains(const wxString& str) const { return Find(str) != -1; }
 795
 796     // use IsEmpty()
 797   bool IsNull() const { return IsEmpty(); }
 798
 799 #ifdef  wxSTD_STRING_COMPATIBILITY
 800   // std::string compatibility functions
 801
 802   // standard types
 803   typedef wxChar value_type;
 804   typedef const value_type *const_iterator;
 805
 806   // an 'invalid' value for string index
 807   static const size_t npos;
 808
 809   // constructors
 810     // take nLen chars starting at nPos
 811   wxString(const wxString& str, size_t nPos, size_t nLen)
 812       : m_pchData(NULL)
 813   {
 814     wxASSERT_MSG( str.GetStringData()->IsValid(),
 815                   _T("did you forget to call UngetWriteBuf()?") );
 816
 817     InitWith(str.c_str(), nPos, nLen == npos ? 0 : nLen);
 818   }
 819     // take all characters from pStart to pEnd
 820   wxString(const void *pStart, const void *pEnd);
 821
 822   // lib.string.capacity
 823     // return the length of the string
 824   size_t size() const { return Len(); }
 825     // return the length of the string
 826   size_t length() const { return Len(); }
 827     // return the maximum size of the string
 828   size_t max_size() const { return wxSTRING_MAXLEN; }
 829     // resize the string, filling the space with c if c != 0
 830   void resize(size_t nSize, wxChar ch = wxT('\0'));
 831     // delete the contents of the string
 832   void clear() { Empty(); }
 833     // returns true if the string is empty
 834   bool empty() const { return IsEmpty(); }
 835     // inform string about planned change in size
 836   void reserve(size_t size) { Alloc(size); }
 837
 838   // lib.string.access
 839     // return the character at position n
 840   wxChar at(size_t n) const { return GetChar(n); }
 841     // returns the writable character at position n
 842   wxChar& at(size_t n) { return GetWritableChar(n); }
 843
 844     // first valid index position
 845   const_iterator begin() const { return wx_str(); }
 846     // position one after the last valid one
 847   const_iterator end() const { return wx_str() + length(); }
 848
 849   // lib.string.modifiers
 850     // append a string
 851   wxString& append(const wxString& str)
 852     { *this += str; return *this; }
 853     // append elements str[pos], ..., str[pos+n]
 854   wxString& append(const wxString& str, size_t pos, size_t n)
 855     { ConcatSelf(n, str.c_str() + pos); return *this; }
 856     // append first n (or all if n == npos) characters of sz
 857   wxString& append(const wxChar *sz, size_t n = npos)
 858     { ConcatSelf(n == npos ? wxStrlen(sz) : n, sz); return *this; }
 859
 860     // append n copies of ch
 861   wxString& append(size_t n, wxChar ch) { return Pad(n, ch); }
 862
 863     // same as `this_string = str'
 864   wxString& assign(const wxString& str)
 865     { return *this = str; }
 866     // same as ` = str[pos..pos + n]
 867   wxString& assign(const wxString& str, size_t pos, size_t n)
 868     { Empty(); return Append(str.c_str() + pos, n); }
 869     // same as `= first n (or all if n == npos) characters of sz'
 870   wxString& assign(const wxChar *sz, size_t n = npos)
 871     { Empty(); return Append(sz, n == npos ? wxStrlen(sz) : n); }
 872     // same as `= n copies of ch'
 873   wxString& assign(size_t n, wxChar ch)
 874     { Empty(); return Append(ch, n); }
 875
 876     // insert another string
 877   wxString& insert(size_t nPos, const wxString& str);
 878     // insert n chars of str starting at nStart (in str)
 879   wxString& insert(size_t nPos, const wxString& str, size_t nStart, size_t n)
 880     { return insert(nPos, wxString((const wxChar *)str + nStart, n)); }
 881
 882     // insert first n (or all if n == npos) characters of sz
 883   wxString& insert(size_t nPos, const wxChar *sz, size_t n = npos)
 884     { return insert(nPos, wxString(sz, n)); }
 885     // insert n copies of ch
 886   wxString& insert(size_t nPos, size_t n, wxChar ch)
 887     { return insert(nPos, wxString(ch, n)); }
 888
 889     // delete characters from nStart to nStart + nLen
 890   wxString& erase(size_t nStart = 0, size_t nLen = npos);
 891
 892     // replaces the substring of length nLen starting at nStart
 893   wxString& replace(size_t nStart, size_t nLen, const wxChar* sz);
 894     // replaces the substring with nCount copies of ch
 895   wxString& replace(size_t nStart, size_t nLen, size_t nCount, wxChar ch);
 896     // replaces a substring with another substring
 897   wxString& replace(size_t nStart, size_t nLen,
 898                     const wxString& str, size_t nStart2, size_t nLen2);
 899     // replaces the substring with first nCount chars of sz
 900   wxString& replace(size_t nStart, size_t nLen,
 901                     const wxChar* sz, size_t nCount);
 902
 903     // swap two strings
 904   void swap(wxString& str);
 905
 906     // All find() functions take the nStart argument which specifies the
 907     // position to start the search on, the default value is 0. All functions
 908     // return npos if there were no match.
 909
 910     // find a substring
 911   size_t find(const wxString& str, size_t nStart = 0) const;
 912
 913   // VC++ 1.5 can't cope with this syntax.
 914 #if !defined(__VISUALC__) || defined(__WIN32__)
 915     // find first n characters of sz
 916   size_t find(const wxChar* sz, size_t nStart = 0, size_t n = npos) const;
 917 #endif // VC++ 1.5
 918
 919   // Gives a duplicate symbol (presumably a case-insensitivity problem)
 920 #if !defined(__BORLANDC__)
 921     // find the first occurence of character ch after nStart
 922   size_t find(wxChar ch, size_t nStart = 0) const;
 923 #endif
 924     // rfind() family is exactly like find() but works right to left
 925
 926     // as find, but from the end
 927   size_t rfind(const wxString& str, size_t nStart = npos) const;
 928
 929   // VC++ 1.5 can't cope with this syntax.
 930 #if !defined(__VISUALC__) || defined(__WIN32__)
 931     // as find, but from the end
 932   size_t rfind(const wxChar* sz, size_t nStart = npos,
 933           size_t n = npos) const;
 934     // as find, but from the end
 935   size_t rfind(wxChar ch, size_t nStart = npos) const;
 936 #endif // VC++ 1.5
 937
 938     // find first/last occurence of any character in the set
 939
 940     // as strpbrk() but starts at nStart, returns npos if not found
 941   size_t find_first_of(const wxString& str, size_t nStart = 0) const
 942     { return find_first_of(str.c_str(), nStart); }
 943     // same as above
 944   size_t find_first_of(const wxChar* sz, size_t nStart = 0) const;
 945     // same as find(char, size_t)
 946   size_t find_first_of(wxChar c, size_t nStart = 0) const
 947     { return find(c, nStart); }
 948     // find the last (starting from nStart) char from str in this string
 949   size_t find_last_of (const wxString& str, size_t nStart = npos) const
 950     { return find_last_of(str.c_str(), nStart); }
 951     // same as above
 952   size_t find_last_of (const wxChar* sz, size_t nStart = npos) const;
 953     // same as above
 954   size_t find_last_of(wxChar c, size_t nStart = npos) const
 955     { return rfind(c, nStart); }
 956
 957     // find first/last occurence of any character not in the set
 958
 959     // as strspn() (starting from nStart), returns npos on failure
 960   size_t find_first_not_of(const wxString& str, size_t nStart = 0) const
 961     { return find_first_not_of(str.c_str(), nStart); }
 962     // same as above
 963   size_t find_first_not_of(const wxChar* sz, size_t nStart = 0) const;
 964     // same as above
 965   size_t find_first_not_of(wxChar ch, size_t nStart = 0) const;
 966     //  as strcspn()
 967   size_t find_last_not_of(const wxString& str, size_t nStart = npos) const
 968     { return find_first_not_of(str.c_str(), nStart); }
 969     // same as above
 970   size_t find_last_not_of(const wxChar* sz, size_t nStart = npos) const;
 971     // same as above
 972   size_t find_last_not_of(wxChar ch, size_t nStart = npos) const;
 973
 974     // All compare functions return -1, 0 or 1 if the [sub]string is less,
 975     // equal or greater than the compare() argument.
 976
 977     // just like strcmp()
 978   int compare(const wxString& str) const { return Cmp(str); }
 979     // comparison with a substring
 980   int compare(size_t nStart, size_t nLen, const wxString& str) const
 981     { return Mid(nStart, nLen).Cmp(str); }
 982     // comparison of 2 substrings
 983   int compare(size_t nStart, size_t nLen,
 984               const wxString& str, size_t nStart2, size_t nLen2) const
 985     { return Mid(nStart, nLen).Cmp(str.Mid(nStart2, nLen2)); }
 986     // just like strcmp()
 987   int compare(const wxChar* sz) const { return Cmp(sz); }
 988     // substring comparison with first nCount characters of sz
 989   int compare(size_t nStart, size_t nLen,
 990               const wxChar* sz, size_t nCount = npos) const
 991     { return Mid(nStart, nLen).Cmp(wxString(sz, nCount)); }
 992
 993   // substring extraction
 994   wxString substr(size_t nStart = 0, size_t nLen = npos) const
 995     { return Mid(nStart, nLen); }
 996 #endif // wxSTD_STRING_COMPATIBILITY
 997 };
 998
 999 // ----------------------------------------------------------------------------
1000 // The string array uses it's knowledge of internal structure of the wxString
1001 // class to optimize string storage. Normally, we would store pointers to
1002 // string, but as wxString is, in fact, itself a pointer (sizeof(wxString) is
1003 // sizeof(char *)) we store these pointers instead. The cast to "wxString *" is
1004 // really all we need to turn such pointer into a string!
1005 //
1006 // Of course, it can be called a dirty hack, but we use twice less memory and
1007 // this approach is also more speed efficient, so it's probably worth it.
1008 //
1009 // Usage notes: when a string is added/inserted, a new copy of it is created,
1010 // so the original string may be safely deleted. When a string is retrieved
1011 // from the array (operator[] or Item() method), a reference is returned.
1012 // ----------------------------------------------------------------------------
1013
1014 class WXDLLEXPORT wxArrayString
1015 {
1016 public:
1017   // type of function used by wxArrayString::Sort()
1018   typedef int (*CompareFunction)(const wxString& first,
1019                                  const wxString& second);
1020
1021   // constructors and destructor
1022     // default ctor
1023   wxArrayString()
1024       : m_nSize(0), m_nCount(0), m_pItems(NULL), m_autoSort(FALSE)
1025       { Init(FALSE); }
1026     // if autoSort is TRUE, the array is always sorted (in alphabetical order)
1027     //
1028     // NB: the reason for using int and not bool is that like this we can avoid
1029     //     using this ctor for implicit conversions from "const char *" (which
1030     //     we'd like to be implicitly converted to wxString instead!)
1031     //
1032     //     of course, using explicit would be even better - if all compilers
1033     //     supported it...
1034   wxArrayString(int autoSort)
1035       : m_nSize(0), m_nCount(0), m_pItems(NULL), m_autoSort(FALSE)
1036       { Init(autoSort != 0); }
1037     // copy ctor
1038   wxArrayString(const wxArrayString& array);
1039     // assignment operator
1040   wxArrayString& operator=(const wxArrayString& src);
1041     // not virtual, this class should not be derived from
1042  ~wxArrayString();
1043
1044   // memory management
1045     // empties the list, but doesn't release memory
1046   void Empty();
1047     // empties the list and releases memory
1048   void Clear();
1049     // preallocates memory for given number of items
1050   void Alloc(size_t nCount);
1051     // minimzes the memory usage (by freeing all extra memory)
1052   void Shrink();
1053
1054   // simple accessors
1055     // number of elements in the array
1056   size_t GetCount() const { return m_nCount; }
1057     // is it empty?
1058   bool IsEmpty() const { return m_nCount == 0; }
1059     // number of elements in the array (GetCount is preferred API)
1060   size_t Count() const { return m_nCount; }
1061
1062   // items access (range checking is done in debug version)
1063     // get item at position uiIndex
1064   wxString& Item(size_t nIndex) const
1065     {
1066         wxASSERT_MSG( nIndex < m_nCount,
1067                       _T("wxArrayString: index out of bounds") );
1068
1069         return *(wxString *)&(m_pItems[nIndex]);
1070     }
1071
1072     // same as Item()
1073   wxString& operator[](size_t nIndex) const { return Item(nIndex); }
1074     // get last item
1075   wxString& Last() const
1076   {
1077       wxASSERT_MSG( !IsEmpty(),
1078                     _T("wxArrayString: index out of bounds") );
1079       return Item(Count() - 1);
1080   }
1081
1082     // return a wxString[], useful for the controls which
1083     // take one in their ctor.  You must delete[] it yourself
1084     // once you are done with it.  Will return NULL if the
1085     // ArrayString was empty.
1086   wxString* GetStringArray() const;
1087
1088   // item management
1089     // Search the element in the array, starting from the beginning if
1090     // bFromEnd is FALSE or from end otherwise. If bCase, comparison is case
1091     // sensitive (default). Returns index of the first item matched or
1092     // wxNOT_FOUND
1093   int  Index (const wxChar *sz, bool bCase = TRUE, bool bFromEnd = FALSE) const;
1094     // add new element at the end (if the array is not sorted), return its
1095     // index
1096   size_t Add(const wxString& str, size_t nInsert = 1);
1097     // add new element at given position
1098   void Insert(const wxString& str, size_t uiIndex, size_t nInsert = 1);
1099     // expand the array to have count elements
1100   void SetCount(size_t count);
1101     // remove first item matching this value
1102   void Remove(const wxChar *sz);
1103     // remove item by index
1104   void Remove(size_t nIndex, size_t nRemove = 1);
1105   void RemoveAt(size_t nIndex, size_t nRemove = 1) { Remove(nIndex, nRemove); }
1106
1107   // sorting
1108     // sort array elements in alphabetical order (or reversed alphabetical
1109     // order if reverseOrder parameter is TRUE)
1110   void Sort(bool reverseOrder = FALSE);
1111     // sort array elements using specified comparaison function
1112   void Sort(CompareFunction compareFunction);
1113
1114   // comparison
1115     // compare two arrays case sensitively
1116   bool operator==(const wxArrayString& a) const;
1117     // compare two arrays case sensitively
1118   bool operator!=(const wxArrayString& a) const { return !(*this == a); }
1119
1120 protected:
1121   void Init(bool autoSort);             // common part of all ctors
1122   void Copy(const wxArrayString& src);  // copies the contents of another array
1123
1124 private:
1125   void Grow(size_t nIncrement = 0);     // makes array bigger if needed
1126   void Free();                          // free all the strings stored
1127
1128   void DoSort();                        // common part of all Sort() variants
1129
1130   size_t  m_nSize,    // current size of the array
1131           m_nCount;   // current number of elements
1132
1133   wxChar  **m_pItems; // pointer to data
1134
1135   bool    m_autoSort; // if TRUE, keep the array always sorted
1136 };
1137
1138 class WXDLLEXPORT wxSortedArrayString : public wxArrayString
1139 {
1140 public:
1141   wxSortedArrayString() : wxArrayString(TRUE)
1142     { }
1143   wxSortedArrayString(const wxArrayString& array) : wxArrayString(TRUE)
1144     { Copy(array); }
1145 };
1146
1147 // ----------------------------------------------------------------------------
1148 // wxStringBuffer: a tiny class allowing to get a writable pointer into string
1149 // ----------------------------------------------------------------------------
1150
1151 class WXDLLEXPORT wxStringBuffer
1152 {
1153 public:
1154     wxStringBuffer(wxString& str, size_t lenWanted = 1024)
1155         : m_str(str), m_buf(NULL)
1156         { m_buf = m_str.GetWriteBuf(lenWanted); }
1157
1158     ~wxStringBuffer() { m_str.UngetWriteBuf(); }
1159
1160     operator wxChar*() const { return m_buf; }
1161
1162 private:
1163     wxString& m_str;
1164     wxChar   *m_buf;
1165
1166     DECLARE_NO_COPY_CLASS(wxStringBuffer)
1167 };
1168
1169 // ---------------------------------------------------------------------------
1170 // wxString comparison functions: operator versions are always case sensitive
1171 // ---------------------------------------------------------------------------
1172
1173 inline bool operator==(const wxString& s1, const wxString& s2)
1174     { return (s1.Len() == s2.Len()) && (s1.Cmp(s2) == 0); }
1175 inline bool operator==(const wxString& s1, const wxChar  * s2)
1176     { return s1.Cmp(s2) == 0; }
1177 inline bool operator==(const wxChar  * s1, const wxString& s2)
1178     { return s2.Cmp(s1) == 0; }
1179 inline bool operator!=(const wxString& s1, const wxString& s2)
1180     { return (s1.Len() != s2.Len()) || (s1.Cmp(s2) != 0); }
1181 inline bool operator!=(const wxString& s1, const wxChar  * s2)
1182     { return s1.Cmp(s2) != 0; }
1183 inline bool operator!=(const wxChar  * s1, const wxString& s2)
1184     { return s2.Cmp(s1) != 0; }
1185 inline bool operator< (const wxString& s1, const wxString& s2)
1186     { return s1.Cmp(s2) < 0; }
1187 inline bool operator< (const wxString& s1, const wxChar  * s2)
1188     { return s1.Cmp(s2) <  0; }
1189 inline bool operator< (const wxChar  * s1, const wxString& s2)
1190     { return s2.Cmp(s1) >  0; }
1191 inline bool operator> (const wxString& s1, const wxString& s2)
1192     { return s1.Cmp(s2) >  0; }
1193 inline bool operator> (const wxString& s1, const wxChar  * s2)
1194     { return s1.Cmp(s2) >  0; }
1195 inline bool operator> (const wxChar  * s1, const wxString& s2)
1196     { return s2.Cmp(s1) <  0; }
1197 inline bool operator<=(const wxString& s1, const wxString& s2)
1198     { return s1.Cmp(s2) <= 0; }
1199 inline bool operator<=(const wxString& s1, const wxChar  * s2)
1200     { return s1.Cmp(s2) <= 0; }
1201 inline bool operator<=(const wxChar  * s1, const wxString& s2)
1202     { return s2.Cmp(s1) >= 0; }
1203 inline bool operator>=(const wxString& s1, const wxString& s2)
1204     { return s1.Cmp(s2) >= 0; }
1205 inline bool operator>=(const wxString& s1, const wxChar  * s2)
1206     { return s1.Cmp(s2) >= 0; }
1207 inline bool operator>=(const wxChar  * s1, const wxString& s2)
1208     { return s2.Cmp(s1) <= 0; }
1209
1210 // comparison with char
1211 inline bool operator==(wxChar c, const wxString& s) { return s.IsSameAs(c); }
1212 inline bool operator==(const wxString& s, wxChar c) { return s.IsSameAs(c); }
1213 inline bool operator!=(wxChar c, const wxString& s) { return !s.IsSameAs(c); }
1214 inline bool operator!=(const wxString& s, wxChar c) { return !s.IsSameAs(c); }
1215
1216 #if wxUSE_UNICODE
1217 inline bool operator==(const wxString& s1, const wxWCharBuffer& s2)
1218     { return (s1.Cmp((const wchar_t *)s2) == 0); }
1219 inline bool operator==(const wxWCharBuffer& s1, const wxString& s2)
1220     { return (s2.Cmp((const wchar_t *)s1) == 0); }
1221 inline bool operator!=(const wxString& s1, const wxWCharBuffer& s2)
1222     { return (s1.Cmp((const wchar_t *)s2) != 0); }
1223 inline bool operator!=(const wxWCharBuffer& s1, const wxString& s2)
1224     { return (s2.Cmp((const wchar_t *)s1) != 0); }
1225 #else // !wxUSE_UNICODE
1226 inline bool operator==(const wxString& s1, const wxCharBuffer& s2)
1227     { return (s1.Cmp((const char *)s2) == 0); }
1228 inline bool operator==(const wxCharBuffer& s1, const wxString& s2)
1229     { return (s2.Cmp((const char *)s1) == 0); }
1230 inline bool operator!=(const wxString& s1, const wxCharBuffer& s2)
1231     { return (s1.Cmp((const char *)s2) != 0); }
1232 inline bool operator!=(const wxCharBuffer& s1, const wxString& s2)
1233     { return (s2.Cmp((const char *)s1) != 0); }
1234 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
1235
1236 wxString WXDLLEXPORT operator+(const wxString& string1,  const wxString& string2);
1237 wxString WXDLLEXPORT operator+(const wxString& string, wxChar ch);
1238 wxString WXDLLEXPORT operator+(wxChar ch, const wxString& string);
1239 wxString WXDLLEXPORT operator+(const wxString& string, const wxChar *psz);
1240 wxString WXDLLEXPORT operator+(const wxChar *psz, const wxString& string);
1241 #if wxUSE_UNICODE
1242 inline wxString operator+(const wxString& string, const wxWCharBuffer& buf)
1243     { return string + (const wchar_t *)buf; }
1244 inline wxString operator+(const wxWCharBuffer& buf, const wxString& string)
1245     { return (const wchar_t *)buf + string; }
1246 #else // !wxUSE_UNICODE
1247 inline wxString operator+(const wxString& string, const wxCharBuffer& buf)
1248     { return string + (const char *)buf; }
1249 inline wxString operator+(const wxCharBuffer& buf, const wxString& string)
1250     { return (const char *)buf + string; }
1251 #endif // wxUSE_UNICODE/!wxUSE_UNICODE
1252
1253 // ---------------------------------------------------------------------------
1254 // Implementation only from here until the end of file
1255 // ---------------------------------------------------------------------------
1256
1257 // don't pollute the library user's name space
1258 #undef wxASSERT_VALID_INDEX
1259
1260 #if defined(wxSTD_STRING_COMPATIBILITY) && wxUSE_STD_IOSTREAM
1261
1262 #include "wx/ioswrap.h"
1263
1264 WXDLLEXPORT wxSTD istream& operator>>(wxSTD istream&, wxString&);
1265 WXDLLEXPORT wxSTD ostream& operator<<(wxSTD ostream&, const wxString&);
1266
1267 #endif  // wxSTD_STRING_COMPATIBILITY
1268
1269 #endif  // _WX_WXSTRINGH__