include/wx/string.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        string.h
   3 // Purpose:     wxString class
   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 #ifndef _WX_WXSTRINGH__
  13 #define _WX_WXSTRINGH__
  14
  15 #ifdef __GNUG__
  16 #pragma interface "string.h"
  17 #endif
  18
  19 /* Dependencies (should be included before this header):
  20  *         string.h
  21  *         stdio.h
  22  *         stdarg.h
  23  *         limits.h
  24  */
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <stdarg.h>
  28 #include <limits.h>
  29 #include <stdlib.h>
  30
  31 #ifndef  WX_PRECOMP
  32   #include "wx/defs.h"     // Robert Roebling
  33   #ifdef    WXSTRING_IS_WXOBJECT
  34     #include "wx/object.h"
  35   #endif
  36 #endif
  37
  38 #include "wx/debug.h"
  39
  40 /** @name wxString library
  41     @memo Efficient wxString class [more or less] compatible with MFC CString,
  42           wxWindows wxString and std::string and some handy functions
  43           missing from string.h.
  44   */
  45 //@{
  46
  47 // ---------------------------------------------------------------------------
  48 // macros
  49 // ---------------------------------------------------------------------------
  50
  51 /** @name Macros
  52     @memo You can switch off wxString/std::string compatibility if desired
  53  */
  54 /// compile the std::string compatibility functions
  55 #define   STD_STRING_COMPATIBILITY
  56
  57 /// define to derive wxString from wxObject
  58 #undef    WXSTRING_IS_WXOBJECT
  59
  60 /// maximum possible length for a string means "take all string" everywhere
  61 //  (as sizeof(StringData) is unknown here we substract 100)
  62 #define   STRING_MAXLEN     (UINT_MAX - 100)
  63
  64 // 'naughty' cast
  65 #define   WXSTRINGCAST (char *)(const char *)
  66
  67 // NB: works only inside wxString class
  68 #define   ASSERT_VALID_INDEX(i) wxASSERT( (unsigned)(i) < Len() )
  69
  70 // ---------------------------------------------------------------------------
  71 /** @name Global functions complementing standard C string library
  72     @memo replacements for strlen() and portable strcasecmp()
  73  */
  74 // ---------------------------------------------------------------------------
  75
  76 /// checks whether the passed in pointer is NULL and if the string is empty
  77 inline bool WXDLLEXPORT IsEmpty(const char *p) { return !p || !*p; }
  78
  79 /// safe version of strlen() (returns 0 if passed NULL pointer)
  80 inline size_t  WXDLLEXPORT Strlen(const char *psz)
  81   { return psz ? strlen(psz) : 0; }
  82
  83 /// portable strcasecmp/_stricmp
  84 inline int WXDLLEXPORT Stricmp(const char *psz1, const char *psz2)
  85 {
  86 #if     defined(_MSC_VER)
  87   return _stricmp(psz1, psz2);
  88 #elif defined(__BORLANDC__)
  89   return stricmp(psz1, psz2);
  90 #elif   defined(__UNIX__) || defined(__GNUWIN32__)
  91   return strcasecmp(psz1, psz2);
  92 #else
  93   // almost all compilers/libraries provide this function (unfortunately under
  94   // different names), that's why we don't implement our own which will surely
  95   // be more efficient than this code (uncomment to use):
  96   /*
  97     register char c1, c2;
  98     do {
  99       c1 = tolower(*psz1++);
 100       c2 = tolower(*psz2++);
 101     } while ( c1 && (c1 == c2) );
 102
 103     return c1 - c2;
 104   */
 105
 106   #error  "Please define string case-insensitive compare for your OS/compiler"
 107 #endif  // OS/compiler
 108 }
 109
 110 // ----------------------------------------------------------------------------
 111 // global data
 112 // ----------------------------------------------------------------------------
 113
 114 // global pointer to empty string
 115 WXDLLEXPORT_DATA(extern const char*) g_szNul;
 116
 117 // return an empty wxString
 118 class WXDLLEXPORT wxString; // not yet defined
 119 inline const wxString& wxGetEmptyString() { return *(wxString *)&g_szNul; }
 120
 121 // ---------------------------------------------------------------------------
 122 // string data prepended with some housekeeping info (used by wxString class),
 123 // is never used directly (but had to be put here to allow inlining)
 124 // ---------------------------------------------------------------------------
 125 struct WXDLLEXPORT wxStringData
 126 {
 127   int     nRefs;        // reference count
 128   size_t  nDataLength,  // actual string length
 129           nAllocLength; // allocated memory size
 130
 131   // mimics declaration 'char data[nAllocLength]'
 132   char* data() const { return (char*)(this + 1); }
 133
 134   // empty string has a special ref count so it's never deleted
 135   bool  IsEmpty()   const { return nRefs == -1; }
 136   bool  IsShared()  const { return nRefs > 1;   }
 137
 138   // lock/unlock
 139   void  Lock()   { if ( !IsEmpty() ) nRefs++;                    }
 140   void  Unlock() { if ( !IsEmpty() && --nRefs == 0) free(this);  }
 141
 142   // if we had taken control over string memory (GetWriteBuf), it's
 143   // intentionally put in invalid state
 144   void  Validate(bool b)  { nRefs = b ? 1 : 0; }
 145   bool  IsValid() const   { return nRefs != 0; }
 146 };
 147
 148 // ---------------------------------------------------------------------------
 149 /**
 150     This is (yet another one) String class for C++ programmers. It doesn't use
 151     any of "advanced" C++ features (i.e. templates, exceptions, namespaces...)
 152     thus you should be able to compile it with practicaly any C++ compiler.
 153     This class uses copy-on-write technique, i.e. identical strings share the
 154     same memory as long as neither of them is changed.
 155
 156     This class aims to be as compatible as possible with the new standard
 157     std::string class, but adds some additional functions and should be
 158     at least as efficient than the standard implementation.
 159
 160     Performance note: it's more efficient to write functions which take
 161     "const String&" arguments than "const char *" if you assign the argument
 162     to another string.
 163
 164     It was compiled and tested under Win32, Linux (libc 5 & 6), Solaris 5.5.
 165
 166     To do:
 167       - ressource support (string tables in ressources)
 168       - more wide character (UNICODE) support
 169       - regular expressions support
 170
 171 @memo     A non-template portable wxString class implementing copy-on-write.
 172 @author   VZ
 173 @version  1.3
 174 */
 175 // ---------------------------------------------------------------------------
 176 #ifdef  WXSTRING_IS_WXOBJECT
 177   class WXDLLEXPORT wxString : public wxObject
 178   {
 179     DECLARE_DYNAMIC_CLASS(wxString)
 180 #else   //WXSTRING_IS_WXOBJECT
 181   class WXDLLEXPORT wxString
 182   {
 183 #endif  //WXSTRING_IS_WXOBJECT
 184
 185 friend class WXDLLEXPORT wxArrayString;
 186
 187   // NB: special care was taken in arrangin the member functions in such order
 188   //     that all inline functions can be effectively inlined
 189 private:
 190   // points to data preceded by wxStringData structure with ref count info
 191   char *m_pchData;
 192
 193   // accessor to string data
 194   wxStringData* GetStringData() const { return (wxStringData*)m_pchData - 1; }
 195
 196   // string (re)initialization functions
 197     // initializes the string to the empty value (must be called only from
 198     // ctors, use Reinit() otherwise)
 199   void Init() { m_pchData = (char *)g_szNul; }
 200     // initializaes the string with (a part of) C-string
 201   void InitWith(const char *psz, size_t nPos = 0, size_t nLen = STRING_MAXLEN);
 202     // as Init, but also frees old data
 203   void Reinit() { GetStringData()->Unlock(); Init(); }
 204
 205   // memory allocation
 206     // allocates memory for string of lenght nLen
 207   void AllocBuffer(size_t nLen);
 208     // copies data to another string
 209   void AllocCopy(wxString&, int, int) const;
 210     // effectively copies data to string
 211   void AssignCopy(size_t, const char *);
 212
 213   // append a (sub)string
 214   void ConcatSelf(int nLen, const char *src);
 215
 216   // functions called before writing to the string: they copy it if there
 217   // are other references to our data (should be the only owner when writing)
 218   void CopyBeforeWrite();
 219   void AllocBeforeWrite(size_t);
 220
 221 public:
 222   /** @name constructors & dtor */
 223   //@{
 224     /// ctor for an empty string
 225   wxString() { Init(); }
 226     /// copy ctor
 227   wxString(const wxString& stringSrc)
 228   {
 229     wxASSERT( stringSrc.GetStringData()->IsValid() );
 230
 231     if ( stringSrc.IsEmpty() ) {
 232       // nothing to do for an empty string
 233       Init();
 234     }
 235     else {
 236       m_pchData = stringSrc.m_pchData;            // share same data
 237       GetStringData()->Lock();                    // => one more copy
 238     }
 239   }
 240     /// string containing nRepeat copies of ch
 241   wxString(char ch, size_t nRepeat = 1);
 242     /// ctor takes first nLength characters from C string
 243     // (default value of STRING_MAXLEN means take all the string)
 244   wxString(const char *psz, size_t nLength = STRING_MAXLEN)
 245     { InitWith(psz, 0, nLength); }
 246     /// from C string (for compilers using unsigned char)
 247   wxString(const unsigned char* psz, size_t nLength = STRING_MAXLEN);
 248     /// from wide (UNICODE) string
 249   wxString(const wchar_t *pwz);
 250     /// dtor is not virtual, this class must not be inherited from!
 251  ~wxString() { GetStringData()->Unlock(); }
 252   //@}
 253
 254   /** @name generic attributes & operations */
 255   //@{
 256     /// as standard strlen()
 257   size_t Len() const { return GetStringData()->nDataLength; }
 258     /// string contains any characters?
 259   bool IsEmpty() const { return Len() == 0; }
 260     /// empty string contents
 261   void Empty()
 262   {
 263     if ( !IsEmpty() )
 264       Reinit();
 265
 266     // should be empty
 267     wxASSERT( GetStringData()->nDataLength == 0 );
 268   }
 269     /// empty the string and free memory
 270   void Clear()
 271   {
 272     if ( !GetStringData()->IsEmpty() )
 273       Reinit();
 274
 275     wxASSERT( GetStringData()->nDataLength == 0 );  // should be empty
 276     wxASSERT( GetStringData()->nAllocLength == 0 ); // and not own any memory
 277   }
 278
 279     /// Is an ascii value
 280   bool IsAscii() const;
 281     /// Is a number
 282   bool IsNumber() const;
 283     /// Is a word
 284   bool IsWord() const;
 285   //@}
 286
 287   /** @name data access (all indexes are 0 based) */
 288   //@{
 289     /// read access
 290     char  GetChar(size_t n) const
 291       { ASSERT_VALID_INDEX( n );  return m_pchData[n]; }
 292     /// read/write access
 293     char& GetWritableChar(size_t n)
 294       { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 295     /// write access
 296     void  SetChar(size_t n, char ch)
 297       { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); m_pchData[n] = ch; }
 298
 299     /// get last character
 300     char  Last() const
 301       { wxASSERT( !IsEmpty() ); return m_pchData[Len() - 1]; }
 302     /// get writable last character
 303     char& Last()
 304       { wxASSERT( !IsEmpty() ); CopyBeforeWrite(); return m_pchData[Len()-1]; }
 305
 306     // on 64bit systems, this gives overload problems:
 307 #if SIZEOF_INT <= 4
 308     /// operator version of GetChar
 309     char  operator[](size_t n) const
 310       { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 311 #endif
 312     /// operator version of GetChar
 313     char  operator[](int n) const
 314       { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 315     /// operator version of GetWritableChar
 316     char& operator[](size_t n)
 317       { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 318
 319     /// implicit conversion to C string
 320     operator const char*() const { return m_pchData; }
 321     /// explicit conversion to C string (use this with printf()!)
 322     const char* c_str()   const { return m_pchData; }
 323     ///
 324     const char* GetData() const { return m_pchData; }
 325   //@}
 326
 327   /** @name overloaded assignment */
 328   //@{
 329     ///
 330   wxString& operator=(const wxString& stringSrc);
 331     ///
 332   wxString& operator=(char ch);
 333     ///
 334   wxString& operator=(const char *psz);
 335     ///
 336   wxString& operator=(const unsigned char* psz);
 337     ///
 338   wxString& operator=(const wchar_t *pwz);
 339   //@}
 340
 341   /** @name string concatenation */
 342   //@{
 343     /** @name in place concatenation */
 344     /** @name concatenate and return the result
 345         left to right associativity of << allows to write
 346         things like "str << str1 << str2 << ..."          */
 347     //@{
 348       /// as +=
 349   wxString& operator<<(const wxString& s)
 350   {
 351     wxASSERT( s.GetStringData()->IsValid() );
 352
 353     ConcatSelf(s.Len(), s);
 354     return *this;
 355   }
 356       /// as +=
 357   wxString& operator<<(const char *psz)
 358     { ConcatSelf(Strlen(psz), psz); return *this; }
 359       /// as +=
 360   wxString& operator<<(char ch) { ConcatSelf(1, &ch); return *this; }
 361     //@}
 362
 363     //@{
 364       /// string += string
 365   void operator+=(const wxString& s) { (void)operator<<(s); }
 366       /// string += C string
 367   void operator+=(const char *psz) { (void)operator<<(psz); }
 368       /// string += char
 369   void operator+=(char ch) { (void)operator<<(ch); }
 370     //@}
 371
 372     /** @name return resulting string */
 373     //@{
 374       ///
 375   friend wxString WXDLLEXPORT operator+(const wxString& string1,  const wxString& string2);
 376       ///
 377   friend wxString WXDLLEXPORT operator+(const wxString& string, char ch);
 378       ///
 379   friend wxString WXDLLEXPORT operator+(char ch, const wxString& string);
 380       ///
 381   friend wxString WXDLLEXPORT operator+(const wxString& string, const char *psz);
 382       ///
 383   friend wxString WXDLLEXPORT operator+(const char *psz, const wxString& string);
 384     //@}
 385   //@}
 386
 387   /** @name stream-like functions */
 388   //@{
 389         /// insert an int into string
 390     wxString& operator<<(int i);
 391         /// insert a float into string
 392     wxString& operator<<(float f);
 393         /// insert a double into string
 394     wxString& operator<<(double d);
 395   //@}
 396
 397   /** @name string comparison */
 398   //@{
 399     /**
 400     case-sensitive comparison
 401     @return 0 if equal, +1 if greater or -1 if less
 402     @see CmpNoCase, IsSameAs
 403     */
 404   int  Cmp(const char *psz) const { return strcmp(c_str(), psz); }
 405     /**
 406     case-insensitive comparison, return code as for wxString::Cmp()
 407     @see: Cmp, IsSameAs
 408     */
 409   int  CmpNoCase(const char *psz) const { return Stricmp(c_str(), psz); }
 410     /**
 411     test for string equality, case-sensitive (default) or not
 412     @param   bCase is TRUE by default (case matters)
 413     @return  TRUE if strings are equal, FALSE otherwise
 414     @see     Cmp, CmpNoCase
 415     */
 416   bool IsSameAs(const char *psz, bool bCase = TRUE) const
 417     { return !(bCase ? Cmp(psz) : CmpNoCase(psz)); }
 418   //@}
 419
 420   /** @name other standard string operations */
 421   //@{
 422     /** @name simple sub-string extraction
 423      */
 424     //@{
 425       /**
 426       return substring starting at nFirst of length
 427       nCount (or till the end if nCount = default value)
 428       */
 429   wxString Mid(size_t nFirst, size_t nCount = STRING_MAXLEN) const;
 430       /// get first nCount characters
 431   wxString Left(size_t nCount) const;
 432       /// get all characters before the first occurence of ch
 433       /// (returns the whole string if ch not found)
 434   wxString Left(char ch) const;
 435       /// get all characters before the last occurence of ch
 436       /// (returns empty string if ch not found)
 437   wxString Before(char ch) const;
 438       /// get all characters after the first occurence of ch
 439       /// (returns empty string if ch not found)
 440   wxString After(char ch) const;
 441       /// get last nCount characters
 442   wxString Right(size_t nCount) const;
 443       /// get all characters after the last occurence of ch
 444       /// (returns the whole string if ch not found)
 445   wxString Right(char ch) const;
 446     //@}
 447
 448     /** @name case conversion */
 449     //@{
 450       ///
 451   wxString& MakeUpper();
 452       ///
 453   wxString& MakeLower();
 454     //@}
 455
 456     /** @name trimming/padding whitespace (either side) and truncating */
 457     //@{
 458       /// remove spaces from left or from right (default) side
 459   wxString& Trim(bool bFromRight = TRUE);
 460       /// add nCount copies chPad in the beginning or at the end (default)
 461   wxString& Pad(size_t nCount, char chPad = ' ', bool bFromRight = TRUE);
 462       /// truncate string to given length
 463   wxString& Truncate(size_t uiLen);
 464     //@}
 465
 466     /** @name searching and replacing */
 467     //@{
 468       /// searching (return starting index, or -1 if not found)
 469   int Find(char ch, bool bFromEnd = FALSE) const;   // like strchr/strrchr
 470       /// searching (return starting index, or -1 if not found)
 471   int Find(const char *pszSub) const;               // like strstr
 472       /**
 473       replace first (or all) occurences of substring with another one
 474       @param  bReplaceAll: global replace (default) or only the first occurence
 475       @return the number of replacements made
 476       */
 477   size_t Replace(const char *szOld, const char *szNew, bool bReplaceAll = TRUE);
 478     //@}
 479
 480     /// check if the string contents matches a mask containing '*' and '?'
 481   bool Matches(const char *szMask) const;
 482   //@}
 483
 484   /** @name formated input/output */
 485   //@{
 486     /// as sprintf(), returns the number of characters written or < 0 on error
 487   int Printf(const char *pszFormat, ...);
 488     /// as vprintf(), returns the number of characters written or < 0 on error
 489   int PrintfV(const char* pszFormat, va_list argptr);
 490   //@}
 491
 492   /** @name raw access to string memory */
 493   //@{
 494     /// ensure that string has space for at least nLen characters
 495     // only works if the data of this string is not shared
 496   void Alloc(size_t nLen);
 497     /// minimize the string's memory
 498     // only works if the data of this string is not shared
 499   void Shrink();
 500     /**
 501         get writable buffer of at least nLen bytes.
 502         Unget() *must* be called a.s.a.p. to put string back in a reasonable
 503         state!
 504      */
 505   char *GetWriteBuf(size_t nLen);
 506     /// call this immediately after GetWriteBuf() has been used
 507   void UngetWriteBuf();
 508   //@}
 509
 510   /** @name wxWindows compatibility functions */
 511   //@{
 512     /// values for second parameter of CompareTo function
 513   enum caseCompare {exact, ignoreCase};
 514     /// values for first parameter of Strip function
 515   enum stripType {leading = 0x1, trailing = 0x2, both = 0x3};
 516     /// same as Printf()
 517   inline int sprintf(const char *pszFormat, ...)
 518   {
 519     va_list argptr;
 520     va_start(argptr, pszFormat);
 521     int iLen = PrintfV(pszFormat, argptr);
 522     va_end(argptr);
 523     return iLen;
 524   }
 525
 526     /// same as Cmp
 527   inline int CompareTo(const char* psz, caseCompare cmp = exact) const
 528     { return cmp == exact ? Cmp(psz) : CmpNoCase(psz); }
 529
 530     /// same as Mid (substring extraction)
 531   inline wxString  operator()(size_t start, size_t len) const
 532     { return Mid(start, len); }
 533
 534     /// same as += or <<
 535   inline wxString& Append(const char* psz) { return *this << psz; }
 536   inline wxString& Append(char ch, int count = 1)
 537     { wxString str(ch, count); (*this) += str; return *this; }
 538
 539     ///
 540   wxString& Prepend(const wxString& str)
 541     { *this = str + *this; return *this; }
 542     /// same as Len
 543   size_t Length() const { return Len(); }
 544     /// same as MakeLower
 545   void LowerCase() { MakeLower(); }
 546     /// same as MakeUpper
 547   void UpperCase() { MakeUpper(); }
 548     /// same as Trim except that it doesn't change this string
 549   wxString Strip(stripType w = trailing) const;
 550
 551     /// same as Find (more general variants not yet supported)
 552   size_t Index(const char* psz) const { return Find(psz); }
 553   size_t Index(char ch)         const { return Find(ch);  }
 554     /// same as Truncate
 555   wxString& Remove(size_t pos) { return Truncate(pos); }
 556   wxString& RemoveLast() { return Truncate(Len() - 1); }
 557
 558   wxString& Remove(size_t nStart, size_t nLen) { return erase( nStart, nLen ); }
 559
 560   int First( const char ch ) const { return Find(ch); }
 561   int First( const char* psz ) const { return Find(psz); }
 562   int First( const wxString &str ) const { return Find(str); }
 563
 564   int Last( const char ch ) const { return Find(ch, TRUE); }
 565
 566     /// same as IsEmpty
 567   bool IsNull() const { return IsEmpty(); }
 568   //@}
 569
 570 #ifdef  STD_STRING_COMPATIBILITY
 571   /** @name std::string compatibility functions */
 572
 573   /// an 'invalid' value for string index
 574   static const size_t npos;
 575
 576   //@{
 577     /** @name constructors */
 578     //@{
 579       /// take nLen chars starting at nPos
 580       wxString(const wxString& str, size_t nPos, size_t nLen = npos)
 581       {
 582         wxASSERT( str.GetStringData()->IsValid() );
 583         InitWith(str.c_str(), nPos, nLen == npos ? 0 : nLen);
 584       }
 585       /// take all characters from pStart to pEnd
 586       wxString(const void *pStart, const void *pEnd);
 587     //@}
 588     /** @name lib.string.capacity */
 589     //@{
 590       /// return the length of the string
 591       size_t size() const { return Len(); }
 592       /// return the length of the string
 593       size_t length() const { return Len(); }
 594       /// return the maximum size of the string
 595       size_t max_size() const { return STRING_MAXLEN; }
 596       /// resize the string, filling the space with c if c != 0
 597       void resize(size_t nSize, char ch = '\0');
 598       /// delete the contents of the string
 599       void clear() { Empty(); }
 600       /// returns true if the string is empty
 601       bool empty() const { return IsEmpty(); }
 602     //@}
 603     /** @name lib.string.access */
 604     //@{
 605       /// return the character at position n
 606       char at(size_t n) const { return GetChar(n); }
 607       /// returns the writable character at position n
 608       char& at(size_t n) { return GetWritableChar(n); }
 609     //@}
 610     /** @name lib.string.modifiers */
 611     //@{
 612       /** @name append something to the end of this one */
 613       //@{
 614         /// append a string
 615         wxString& append(const wxString& str)
 616           { *this += str; return *this; }
 617         /// append elements str[pos], ..., str[pos+n]
 618         wxString& append(const wxString& str, size_t pos, size_t n)
 619           { ConcatSelf(n, str.c_str() + pos); return *this; }
 620         /// append first n (or all if n == npos) characters of sz
 621         wxString& append(const char *sz, size_t n = npos)
 622           { ConcatSelf(n == npos ? Strlen(sz) : n, sz); return *this; }
 623
 624         /// append n copies of ch
 625         wxString& append(size_t n, char ch) { return Pad(n, ch); }
 626       //@}
 627
 628       /** @name replaces the contents of this string with another one */
 629       //@{
 630         /// same as `this_string = str'
 631         wxString& assign(const wxString& str) { return (*this) = str; }
 632         /// same as ` = str[pos..pos + n]
 633         wxString& assign(const wxString& str, size_t pos, size_t n)
 634           { return *this = wxString((const char *)str + pos, n); }
 635         /// same as `= first n (or all if n == npos) characters of sz'
 636         wxString& assign(const char *sz, size_t n = npos)
 637           { return *this = wxString(sz, n); }
 638         /// same as `= n copies of ch'
 639         wxString& assign(size_t n, char ch)
 640           { return *this = wxString(ch, n); }
 641
 642       //@}
 643
 644       /** @name inserts something at position nPos into this one */
 645       //@{
 646         /// insert another string
 647         wxString& insert(size_t nPos, const wxString& str);
 648         /// insert n chars of str starting at nStart (in str)
 649         wxString& insert(size_t nPos, const wxString& str, size_t nStart, size_t n)
 650           { return insert(nPos, wxString((const char *)str + nStart, n)); }
 651
 652         /// insert first n (or all if n == npos) characters of sz
 653         wxString& insert(size_t nPos, const char *sz, size_t n = npos)
 654           { return insert(nPos, wxString(sz, n)); }
 655         /// insert n copies of ch
 656         wxString& insert(size_t nPos, size_t n, char ch)
 657           { return insert(nPos, wxString(ch, n)); }
 658
 659       //@}
 660
 661       /** @name deletes a part of the string */
 662       //@{
 663         /// delete characters from nStart to nStart + nLen
 664         wxString& erase(size_t nStart = 0, size_t nLen = npos);
 665       //@}
 666
 667       /** @name replaces a substring of this string with another one */
 668       //@{
 669          /// replaces the substring of length nLen starting at nStart
 670          wxString& replace(size_t nStart, size_t nLen, const char* sz);
 671          /// replaces the substring with nCount copies of ch
 672          wxString& replace(size_t nStart, size_t nLen, size_t nCount, char ch);
 673          /// replaces a substring with another substring
 674          wxString& replace(size_t nStart, size_t nLen,
 675                          const wxString& str, size_t nStart2, size_t nLen2);
 676          /// replaces the substring with first nCount chars of sz
 677          wxString& replace(size_t nStart, size_t nLen,
 678                          const char* sz, size_t nCount);
 679       //@}
 680     //@}
 681
 682     /// swap two strings
 683     void swap(wxString& str);
 684
 685     /** @name string operations */
 686     //@{
 687       /** All find() functions take the nStart argument which specifies
 688           the position to start the search on, the default value is 0.
 689
 690           All functions return npos if there were no match.
 691
 692           @name string search
 693       */
 694       //@{
 695         /**
 696             @name find a match for the string/character in this string
 697         */
 698         //@{
 699           /// find a substring
 700           size_t find(const wxString& str, size_t nStart = 0) const;
 701
 702           // VC++ 1.5 can't cope with this syntax.
 703 #if ! (defined(_MSC_VER) && !defined(__WIN32__))
 704           /// find first n characters of sz
 705           size_t find(const char* sz, size_t nStart = 0, size_t n = npos) const;
 706 #endif
 707           /// find the first occurence of character ch after nStart
 708           size_t find(char ch, size_t nStart = 0) const;
 709
 710           // wxWin compatibility
 711           inline bool Contains(const wxString& str) const { return Find(str) != -1; }
 712
 713         //@}
 714
 715         /**
 716           @name rfind() family is exactly like find() but works right to left
 717         */
 718         //@{
 719         /// as find, but from the end
 720         size_t rfind(const wxString& str, size_t nStart = npos) const;
 721         /// as find, but from the end
 722         // VC++ 1.5 can't cope with this syntax.
 723 #if ! (defined(_MSC_VER) && !defined(__WIN32__))
 724         size_t rfind(const char* sz, size_t nStart = npos,
 725                      size_t n = npos) const;
 726         /// as find, but from the end
 727         size_t rfind(char ch, size_t nStart = npos) const;
 728 #endif
 729         //@}
 730
 731         /**
 732           @name find first/last occurence of any character in the set
 733         */
 734         //@{
 735           ///
 736           size_t find_first_of(const wxString& str, size_t nStart = 0) const;
 737           ///
 738           size_t find_first_of(const char* sz, size_t nStart = 0) const;
 739           /// same as find(char, size_t)
 740           size_t find_first_of(char c, size_t nStart = 0) const;
 741
 742           ///
 743           size_t find_last_of (const wxString& str, size_t nStart = npos) const;
 744           ///
 745           size_t find_last_of (const char* s, size_t nStart = npos) const;
 746           /// same as rfind(char, size_t)
 747           size_t find_last_of (char c, size_t nStart = npos) const;
 748         //@}
 749
 750         /**
 751           @name find first/last occurence of any character not in the set
 752         */
 753         //@{
 754           ///
 755           size_t find_first_not_of(const wxString& str, size_t nStart = 0) const;
 756           ///
 757           size_t find_first_not_of(const char* s, size_t nStart = 0) const;
 758           ///
 759           size_t find_first_not_of(char ch, size_t nStart = 0) const;
 760
 761           ///
 762           size_t find_last_not_of(const wxString& str, size_t nStart=npos) const;
 763           ///
 764           size_t find_last_not_of(const char* s, size_t nStart = npos) const;
 765           ///
 766           size_t find_last_not_of(char ch, size_t nStart = npos) const;
 767         //@}
 768       //@}
 769
 770       /**
 771         All compare functions return -1, 0 or 1 if the [sub]string
 772         is less, equal or greater than the compare() argument.
 773
 774         @name comparison
 775       */
 776       //@{
 777         /// just like strcmp()
 778         int compare(const wxString& str) const { return Cmp(str); }
 779         /// comparison with a substring
 780         int compare(size_t nStart, size_t nLen, const wxString& str) const;
 781         /// comparison of 2 substrings
 782         int compare(size_t nStart, size_t nLen,
 783                     const wxString& str, size_t nStart2, size_t nLen2) const;
 784         /// just like strcmp()
 785         int compare(const char* sz) const { return Cmp(sz); }
 786         /// substring comparison with first nCount characters of sz
 787         int compare(size_t nStart, size_t nLen,
 788                     const char* sz, size_t nCount = npos) const;
 789       //@}
 790     wxString substr(size_t nStart = 0, size_t nLen = npos) const;
 791   //@}
 792 #endif
 793 };
 794
 795 // ----------------------------------------------------------------------------
 796 /** The string array uses it's knowledge of internal structure of the String
 797     class to optimize string storage. Normally, we would store pointers to
 798     string, but as String is, in fact, itself a pointer (sizeof(String) is
 799     sizeof(char *)) we store these pointers instead. The cast to "String *"
 800     is really all we need to turn such pointer into a string!
 801
 802     Of course, it can be called a dirty hack, but we use twice less memory
 803     and this approach is also more speed efficient, so it's probably worth it.
 804
 805     Usage notes: when a string is added/inserted, a new copy of it is created,
 806     so the original string may be safely deleted. When a string is retrieved
 807     from the array (operator[] or Item() method), a reference is returned.
 808
 809     @name wxArrayString
 810     @memo probably the most commonly used array type - array of strings
 811  */
 812 // ----------------------------------------------------------------------------
 813 class WXDLLEXPORT wxArrayString
 814 {
 815 public:
 816   /** @name ctors and dtor */
 817   //@{
 818     /// default ctor
 819   wxArrayString();
 820     /// copy ctor
 821   wxArrayString(const wxArrayString& array);
 822     /// assignment operator
 823   wxArrayString& operator=(const wxArrayString& src);
 824     /// not virtual, this class can't be derived from
 825  ~wxArrayString();
 826   //@}
 827
 828   /** @name memory management */
 829   //@{
 830     /// empties the list, but doesn't release memory
 831   void Empty();
 832     /// empties the list and releases memory
 833   void Clear();
 834     /// preallocates memory for given number of items
 835   void Alloc(size_t nCount);
 836     /// minimzes the memory usage (by freeing all extra memory)
 837   void Shrink();
 838   //@}
 839
 840   /** @name simple accessors */
 841   //@{
 842     /// number of elements in the array
 843   size_t  Count() const   { return m_nCount;      }
 844     /// is it empty?
 845   bool  IsEmpty() const { return m_nCount == 0; }
 846   //@}
 847
 848   /** @name items access (range checking is done in debug version) */
 849   //@{
 850     /// get item at position uiIndex
 851   wxString& Item(size_t nIndex) const
 852     { wxASSERT( nIndex < m_nCount ); return *(wxString *)&(m_pItems[nIndex]); }
 853     /// same as Item()
 854   wxString& operator[](size_t nIndex) const { return Item(nIndex); }
 855     /// get last item
 856   wxString& Last() const { wxASSERT( !IsEmpty() ); return Item(Count() - 1); }
 857   //@}
 858
 859   /** @name item management */
 860   //@{
 861     /**
 862       Search the element in the array, starting from the either side
 863       @param if bFromEnd reverse search direction
 864       @param if bCase, comparison is case sensitive (default)
 865       @return index of the first item matched or NOT_FOUND
 866       @see NOT_FOUND
 867      */
 868   int  Index (const char *sz, bool bCase = TRUE, bool bFromEnd = FALSE) const;
 869     /// add new element at the end
 870   void Add   (const wxString& str);
 871     /// add new element at given position
 872   void Insert(const wxString& str, size_t uiIndex);
 873     /// remove first item matching this value
 874   void Remove(const char *sz);
 875     /// remove item by index
 876   void Remove(size_t nIndex);
 877   //@}
 878
 879   /// sort array elements
 880   void Sort(bool bCase = TRUE, bool bReverse = FALSE);
 881
 882 private:
 883   void    Grow();     // makes array bigger if needed
 884   void    Free();     // free the string stored
 885
 886   size_t    m_nSize,    // current size of the array
 887           m_nCount;   // current number of elements
 888
 889   char  **m_pItems;   // pointer to data
 890 };
 891
 892 // ---------------------------------------------------------------------------
 893 /** @name wxString comparison functions
 894     @memo Comparisons are case sensitive
 895  */
 896 // ---------------------------------------------------------------------------
 897 //@{
 898 inline bool operator==(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) == 0; }
 899 ///
 900 inline bool operator==(const wxString& s1, const char  * s2) { return s1.Cmp(s2) == 0; }
 901 ///
 902 inline bool operator==(const char  * s1, const wxString& s2) { return s2.Cmp(s1) == 0; }
 903 ///
 904 inline bool operator!=(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) != 0; }
 905 ///
 906 inline bool operator!=(const wxString& s1, const char  * s2) { return s1.Cmp(s2) != 0; }
 907 ///
 908 inline bool operator!=(const char  * s1, const wxString& s2) { return s2.Cmp(s1) != 0; }
 909 ///
 910 inline bool operator< (const wxString& s1, const wxString& s2) { return s1.Cmp(s2) <  0; }
 911 ///
 912 inline bool operator< (const wxString& s1, const char  * s2) { return s1.Cmp(s2) <  0; }
 913 ///
 914 inline bool operator< (const char  * s1, const wxString& s2) { return s2.Cmp(s1) >  0; }
 915 ///
 916 inline bool operator> (const wxString& s1, const wxString& s2) { return s1.Cmp(s2) >  0; }
 917 ///
 918 inline bool operator> (const wxString& s1, const char  * s2) { return s1.Cmp(s2) >  0; }
 919 ///
 920 inline bool operator> (const char  * s1, const wxString& s2) { return s2.Cmp(s1) <  0; }
 921 ///
 922 inline bool operator<=(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) <= 0; }
 923 ///
 924 inline bool operator<=(const wxString& s1, const char  * s2) { return s1.Cmp(s2) <= 0; }
 925 ///
 926 inline bool operator<=(const char  * s1, const wxString& s2) { return s2.Cmp(s1) >= 0; }
 927 ///
 928 inline bool operator>=(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) >= 0; }
 929 ///
 930 inline bool operator>=(const wxString& s1, const char  * s2) { return s1.Cmp(s2) >= 0; }
 931 ///
 932 inline bool operator>=(const char  * s1, const wxString& s2) { return s2.Cmp(s1) <= 0; }
 933 //@}
 934 wxString WXDLLEXPORT operator+(const wxString& string1,  const wxString& string2);
 935 wxString WXDLLEXPORT operator+(const wxString& string, char ch);
 936 wxString WXDLLEXPORT operator+(char ch, const wxString& string);
 937 wxString WXDLLEXPORT operator+(const wxString& string, const char *psz);
 938 wxString WXDLLEXPORT operator+(const char *psz, const wxString& string);
 939
 940 // ---------------------------------------------------------------------------
 941 /** @name Global functions complementing standard C string library
 942     @memo replacements for strlen() and portable strcasecmp()
 943  */
 944 // ---------------------------------------------------------------------------
 945
 946 #ifdef  STD_STRING_COMPATIBILITY
 947
 948 // fwd decl
 949 // Known not to work with wxUSE_IOSTREAMH set to 0, so
 950 // replacing with includes (on advice of ungod@pasdex.com.au)
 951 // class WXDLLEXPORT istream;
 952 #if wxUSE_IOSTREAMH
 953 // N.B. BC++ doesn't have istream.h, ostream.h
 954 #include <iostream.h>
 955 #else
 956 #include <istream>
 957 #  ifdef _MSC_VER
 958       using namespace std;
 959 #  endif
 960 #endif
 961
 962 WXDLLEXPORT istream& operator>>(istream& is, wxString& str);
 963
 964 #endif  //std::string compatibility
 965
 966 #endif  // _WX_WXSTRINGH__
 967
 968 //@}