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 __WXSTRINGH__
  13 #define __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   uint    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 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   uint Len() const { return GetStringData()->nDataLength; }
 258     /// string contains any characters?
 259   bool IsEmpty() const { return Len() == 0; }
 260     /// reinitialize string (and free data!)
 261   void Empty()
 262   {
 263     if ( GetStringData()->nDataLength != 0 )
 264       Reinit();
 265
 266     wxASSERT( GetStringData()->nDataLength == 0 );
 267     wxASSERT( GetStringData()->nAllocLength == 0 );
 268   }
 269
 270     /// Is an ascii value
 271   bool IsAscii() const;
 272     /// Is a number
 273   bool IsNumber() const;
 274     /// Is a word
 275   bool IsWord() const;
 276   //@}
 277
 278   /** @name data access (all indexes are 0 based) */
 279   //@{
 280     /// read access
 281     char  GetChar(size_t n) const
 282       { ASSERT_VALID_INDEX( n );  return m_pchData[n]; }
 283     /// read/write access
 284     char& GetWritableChar(size_t n)
 285       { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 286     /// write access
 287     void  SetChar(size_t n, char ch)
 288       { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); m_pchData[n] = ch; }
 289
 290     /// get last character
 291     char  Last() const
 292       { wxASSERT( !IsEmpty() ); return m_pchData[Len() - 1]; }
 293     /// get writable last character
 294     char& Last()
 295       { wxASSERT( !IsEmpty() ); CopyBeforeWrite(); return m_pchData[Len()-1]; }
 296
 297     /// operator version of GetChar
 298     char  operator[](size_t n) const
 299       { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 300     /// operator version of GetChar
 301     char  operator[](int n) const
 302       { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
 303     /// operator version of GetWritableChar
 304     char& operator[](size_t n)
 305       { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
 306
 307     /// implicit conversion to C string
 308     operator const char*() const { return m_pchData; }
 309     /// explicit conversion to C string (use this with printf()!)
 310     const char* c_str()   const { return m_pchData; }
 311     ///
 312     const char* GetData() const { return m_pchData; }
 313   //@}
 314
 315   /** @name overloaded assignment */
 316   //@{
 317     ///
 318   wxString& operator=(const wxString& stringSrc);
 319     ///
 320   wxString& operator=(char ch);
 321     ///
 322   wxString& operator=(const char *psz);
 323     ///
 324   wxString& operator=(const unsigned char* psz);
 325     ///
 326   wxString& operator=(const wchar_t *pwz);
 327   //@}
 328
 329   /** @name string concatenation */
 330   //@{
 331     /** @name in place concatenation */
 332     /** @name concatenate and return the result
 333         left to right associativity of << allows to write
 334         things like "str << str1 << str2 << ..."          */
 335     //@{
 336       /// as +=
 337   wxString& operator<<(const wxString& s)
 338   {
 339     wxASSERT( s.GetStringData()->IsValid() );
 340
 341     ConcatSelf(s.Len(), s);
 342     return *this;
 343   }
 344       /// as +=
 345   wxString& operator<<(const char *psz)
 346     { ConcatSelf(Strlen(psz), psz); return *this; }
 347       /// as +=
 348   wxString& operator<<(char ch) { ConcatSelf(1, &ch); return *this; }
 349     //@}
 350
 351     //@{
 352       /// string += string
 353   void operator+=(const wxString& s) { (void)operator<<(s); }
 354       /// string += C string
 355   void operator+=(const char *psz) { (void)operator<<(psz); }
 356       /// string += char
 357   void operator+=(char ch) { (void)operator<<(ch); }
 358     //@}
 359
 360     /** @name return resulting string */
 361     //@{
 362       ///
 363   friend wxString operator+(const wxString& string1,  const wxString& string2);
 364       ///
 365   friend wxString operator+(const wxString& string, char ch);
 366       ///
 367   friend wxString operator+(char ch, const wxString& string);
 368       ///
 369   friend wxString operator+(const wxString& string, const char *psz);
 370       ///
 371   friend wxString operator+(const char *psz, const wxString& string);
 372     //@}
 373   //@}
 374
 375   /** @name string comparison */
 376   //@{
 377     /**
 378     case-sensitive comparison
 379     @return 0 if equal, +1 if greater or -1 if less
 380     @see CmpNoCase, IsSameAs
 381     */
 382   int  Cmp(const char *psz) const { return strcmp(c_str(), psz); }
 383     /**
 384     case-insensitive comparison, return code as for wxString::Cmp()
 385     @see: Cmp, IsSameAs
 386     */
 387   int  CmpNoCase(const char *psz) const { return Stricmp(c_str(), psz); }
 388     /**
 389     test for string equality, case-sensitive (default) or not
 390     @param   bCase is TRUE by default (case matters)
 391     @return  TRUE if strings are equal, FALSE otherwise
 392     @see     Cmp, CmpNoCase
 393     */
 394   bool IsSameAs(const char *psz, bool bCase = TRUE) const
 395     { return !(bCase ? Cmp(psz) : CmpNoCase(psz)); }
 396   //@}
 397
 398   /** @name other standard string operations */
 399   //@{
 400     /** @name simple sub-string extraction
 401      */
 402     //@{
 403       /**
 404       return substring starting at nFirst of length
 405       nCount (or till the end if nCount = default value)
 406       */
 407   wxString Mid(size_t nFirst, size_t nCount = STRING_MAXLEN) const;
 408       /// get first nCount characters
 409   wxString Left(size_t nCount) const;
 410       /// get all characters before the first occurence of ch
 411       /// (returns the whole string if ch not found)
 412   wxString Left(char ch) const;
 413       /// get all characters before the last occurence of ch
 414       /// (returns empty string if ch not found)
 415   wxString Before(char ch) const;
 416       /// get all characters after the first occurence of ch
 417       /// (returns empty string if ch not found)
 418   wxString After(char ch) const;
 419       /// get last nCount characters
 420   wxString Right(size_t nCount) const;
 421       /// get all characters after the last occurence of ch
 422       /// (returns the whole string if ch not found)
 423   wxString Right(char ch) const;
 424     //@}
 425
 426     /** @name case conversion */
 427     //@{
 428       ///
 429   wxString& MakeUpper();
 430       ///
 431   wxString& MakeLower();
 432     //@}
 433
 434     /** @name trimming/padding whitespace (either side) and truncating */
 435     //@{
 436       /// remove spaces from left or from right (default) side
 437   wxString& Trim(bool bFromRight = TRUE);
 438       /// add nCount copies chPad in the beginning or at the end (default)
 439   wxString& Pad(size_t nCount, char chPad = ' ', bool bFromRight = TRUE);
 440       /// truncate string to given length
 441   wxString& Truncate(size_t uiLen);
 442     //@}
 443
 444     /** @name searching and replacing */
 445     //@{
 446       /// searching (return starting index, or -1 if not found)
 447   int Find(char ch, bool bFromEnd = FALSE) const;   // like strchr/strrchr
 448       /// searching (return starting index, or -1 if not found)
 449   int Find(const char *pszSub) const;               // like strstr
 450       /**
 451       replace first (or all) occurences of substring with another one
 452       @param  bReplaceAll: global replace (default) or only the first occurence
 453       @return the number of replacements made
 454       */
 455   uint Replace(const char *szOld, const char *szNew, bool bReplaceAll = TRUE);
 456     //@}
 457
 458     /// check if the string contents matches a mask containing '*' and '?'
 459   bool Matches(const char *szMask) const;
 460   //@}
 461
 462   /** @name formated input/output */
 463   //@{
 464     /// as sprintf(), returns the number of characters written or < 0 on error
 465   int Printf(const char *pszFormat, ...);
 466     /// as vprintf(), returns the number of characters written or < 0 on error
 467   int PrintfV(const char* pszFormat, va_list argptr);
 468   //@}
 469
 470   /** @name raw access to string memory */
 471   //@{
 472     /// ensure that string has space for at least nLen characters
 473     // only works if the data of this string is not shared
 474   void Alloc(uint nLen);
 475     /// minimize the string's memory
 476     // only works if the data of this string is not shared
 477   void Shrink();
 478     /**
 479         get writable buffer of at least nLen bytes.
 480         Unget() *must* be called a.s.a.p. to put string back in a reasonable
 481         state!
 482      */
 483   char *GetWriteBuf(uint nLen);
 484     /// call this immediately after GetWriteBuf() has been used
 485   void UngetWriteBuf();
 486   //@}
 487
 488   /** @name wxWindows compatibility functions */
 489   //@{
 490     /// values for second parameter of CompareTo function
 491   enum caseCompare {exact, ignoreCase};
 492     /// values for first parameter of Strip function
 493   enum stripType {leading = 0x1, trailing = 0x2, both = 0x3};
 494     /// same as Printf()
 495   inline int sprintf(const char *pszFormat, ...)
 496   {
 497     va_list argptr;
 498     va_start(argptr, pszFormat);
 499     int iLen = PrintfV(pszFormat, argptr);
 500     va_end(argptr);
 501     return iLen;
 502   }
 503
 504     /// same as Cmp
 505   inline int CompareTo(const char* psz, caseCompare cmp = exact) const
 506     { return cmp == exact ? Cmp(psz) : CmpNoCase(psz); }
 507
 508     /// same as Mid (substring extraction)
 509   inline wxString  operator()(size_t start, size_t len) const
 510     { return Mid(start, len); }
 511
 512     /// same as += or <<
 513   inline wxString& Append(const char* psz) { return *this << psz; }
 514   inline wxString& Append(char ch, int count = 1)
 515     { wxString str(ch, count); (*this) += str; return *this; }
 516
 517     ///
 518   wxString& Prepend(const wxString& str)
 519     { *this = str + *this; return *this; }
 520     /// same as Len
 521   size_t Length() const { return Len(); }
 522     /// same as MakeLower
 523   void LowerCase() { MakeLower(); }
 524     /// same as MakeUpper
 525   void UpperCase() { MakeUpper(); }
 526     /// same as Trim except that it doesn't change this string
 527   wxString Strip(stripType w = trailing) const;
 528
 529     /// same as Find (more general variants not yet supported)
 530   size_t Index(const char* psz) const { return Find(psz); }
 531   size_t Index(char ch)         const { return Find(ch);  }
 532     /// same as Truncate
 533   wxString& Remove(size_t pos) { return Truncate(pos); }
 534   wxString& RemoveLast() { return Truncate(Len() - 1); }
 535
 536   wxString& Remove(size_t nStart, size_t nLen) { return erase( nStart, nLen ); }
 537
 538   int First( const char ch ) const { return Find(ch); }
 539   int First( const char* psz ) const { return Find(psz); }
 540   int First( const wxString &str ) const { return Find(str); }
 541
 542   int Last( const char ch ) const { return Find(ch, TRUE); }
 543
 544     /// same as IsEmpty
 545   bool IsNull() const { return IsEmpty(); }
 546   //@}
 547
 548 #ifdef  STD_STRING_COMPATIBILITY
 549   /** @name std::string compatibility functions */
 550
 551   /// an 'invalid' value for string index
 552   static const size_t npos;
 553
 554   //@{
 555     /** @name constructors */
 556     //@{
 557       /// take nLen chars starting at nPos
 558       wxString(const wxString& str, size_t nPos, size_t nLen = npos)
 559       {
 560         wxASSERT( str.GetStringData()->IsValid() );
 561         InitWith(str.c_str(), nPos, nLen == npos ? 0 : nLen);
 562       }
 563       /// take all characters from pStart to pEnd
 564       wxString(const void *pStart, const void *pEnd);
 565     //@}
 566     /** @name lib.string.capacity */
 567     //@{
 568       /// return the length of the string
 569       size_t size() const { return Len(); }
 570       /// return the length of the string
 571       size_t length() const { return Len(); }
 572       /// return the maximum size of the string
 573       size_t max_size() const { return STRING_MAXLEN; }
 574       /// resize the string, filling the space with c if c != 0
 575       void resize(size_t nSize, char ch = '\0');
 576       /// delete the contents of the string
 577       void clear() { Empty(); }
 578       /// returns true if the string is empty
 579       bool empty() const { return IsEmpty(); }
 580     //@}
 581     /** @name lib.string.access */
 582     //@{
 583       /// return the character at position n
 584       char at(size_t n) const { return GetChar(n); }
 585       /// returns the writable character at position n
 586       char& at(size_t n) { return GetWritableChar(n); }
 587     //@}
 588     /** @name lib.string.modifiers */
 589     //@{
 590       /** @name append something to the end of this one */
 591       //@{
 592         /// append a string
 593         wxString& append(const wxString& str)
 594           { *this += str; return *this; }
 595         /// append elements str[pos], ..., str[pos+n]
 596         wxString& append(const wxString& str, size_t pos, size_t n)
 597           { ConcatSelf(n, str.c_str() + pos); return *this; }
 598         /// append first n (or all if n == npos) characters of sz
 599         wxString& append(const char *sz, size_t n = npos)
 600           { ConcatSelf(n == npos ? Strlen(sz) : n, sz); return *this; }
 601
 602         /// append n copies of ch
 603         wxString& append(size_t n, char ch) { return Pad(n, ch); }
 604       //@}
 605
 606       /** @name replaces the contents of this string with another one */
 607       //@{
 608         /// same as `this_string = str'
 609         wxString& assign(const wxString& str) { return (*this) = str; }
 610         /// same as ` = str[pos..pos + n]
 611         wxString& assign(const wxString& str, size_t pos, size_t n)
 612           { return *this = wxString((const char *)str + pos, n); }
 613         /// same as `= first n (or all if n == npos) characters of sz'
 614         wxString& assign(const char *sz, size_t n = npos)
 615           { return *this = wxString(sz, n); }
 616         /// same as `= n copies of ch'
 617         wxString& assign(size_t n, char ch)
 618           { return *this = wxString(ch, n); }
 619
 620       //@}
 621
 622       /** @name inserts something at position nPos into this one */
 623       //@{
 624         /// insert another string
 625         wxString& insert(size_t nPos, const wxString& str);
 626         /// insert n chars of str starting at nStart (in str)
 627         wxString& insert(size_t nPos, const wxString& str, size_t nStart, size_t n)
 628           { return insert(nPos, wxString((const char *)str + nStart, n)); }
 629
 630         /// insert first n (or all if n == npos) characters of sz
 631         wxString& insert(size_t nPos, const char *sz, size_t n = npos)
 632           { return insert(nPos, wxString(sz, n)); }
 633         /// insert n copies of ch
 634         wxString& insert(size_t nPos, size_t n, char ch)
 635           { return insert(nPos, wxString(ch, n)); }
 636
 637       //@}
 638
 639       /** @name deletes a part of the string */
 640       //@{
 641         /// delete characters from nStart to nStart + nLen
 642         wxString& erase(size_t nStart = 0, size_t nLen = npos);
 643       //@}
 644
 645       /** @name replaces a substring of this string with another one */
 646       //@{
 647          /// replaces the substring of length nLen starting at nStart
 648          wxString& replace(size_t nStart, size_t nLen, const char* sz);
 649          /// replaces the substring with nCount copies of ch
 650          wxString& replace(size_t nStart, size_t nLen, size_t nCount, char ch);
 651          /// replaces a substring with another substring
 652          wxString& replace(size_t nStart, size_t nLen,
 653                          const wxString& str, size_t nStart2, size_t nLen2);
 654          /// replaces the substring with first nCount chars of sz
 655          wxString& replace(size_t nStart, size_t nLen,
 656                          const char* sz, size_t nCount);
 657       //@}
 658     //@}
 659
 660     /// swap two strings
 661     void swap(wxString& str);
 662
 663     /** @name string operations */
 664     //@{
 665       /** All find() functions take the nStart argument which specifies
 666           the position to start the search on, the default value is 0.
 667
 668           All functions return npos if there were no match.
 669
 670           @name string search
 671       */
 672       //@{
 673         /**
 674             @name find a match for the string/character in this string
 675         */
 676         //@{
 677           /// find a substring
 678           size_t find(const wxString& str, size_t nStart = 0) const;
 679
 680           // VC++ 1.5 can't cope with this syntax.
 681 #if ! (defined(_MSC_VER) && !defined(__WIN32__))
 682           /// find first n characters of sz
 683           size_t find(const char* sz, size_t nStart = 0, size_t n = npos) const;
 684 #endif
 685           /// find the first occurence of character ch after nStart
 686           size_t find(char ch, size_t nStart = 0) const;
 687
 688           // wxWin compatibility
 689           inline bool Contains(const wxString& str) { return Find(str) != -1; }
 690
 691         //@}
 692
 693         /**
 694           @name rfind() family is exactly like find() but works right to left
 695         */
 696         //@{
 697         /// as find, but from the end
 698         size_t rfind(const wxString& str, size_t nStart = npos) const;
 699         /// as find, but from the end
 700         // VC++ 1.5 can't cope with this syntax.
 701 #if ! (defined(_MSC_VER) && !defined(__WIN32__))
 702         size_t rfind(const char* sz, size_t nStart = npos,
 703                      size_t n = npos) const;
 704         /// as find, but from the end
 705         size_t rfind(char ch, size_t nStart = npos) const;
 706 #endif
 707         //@}
 708
 709         /**
 710           @name find first/last occurence of any character in the set
 711         */
 712         //@{
 713           ///
 714           size_t find_first_of(const wxString& str, size_t nStart = 0) const;
 715           ///
 716           size_t find_first_of(const char* sz, size_t nStart = 0) const;
 717           /// same as find(char, size_t)
 718           size_t find_first_of(char c, size_t nStart = 0) const;
 719
 720           ///
 721           size_t find_last_of (const wxString& str, size_t nStart = npos) const;
 722           ///
 723           size_t find_last_of (const char* s, size_t nStart = npos) const;
 724           /// same as rfind(char, size_t)
 725           size_t find_last_of (char c, size_t nStart = npos) const;
 726         //@}
 727
 728         /**
 729           @name find first/last occurence of any character not in the set
 730         */
 731         //@{
 732           ///
 733           size_t find_first_not_of(const wxString& str, size_t nStart = 0) const;
 734           ///
 735           size_t find_first_not_of(const char* s, size_t nStart = 0) const;
 736           ///
 737           size_t find_first_not_of(char ch, size_t nStart = 0) const;
 738
 739           ///
 740           size_t find_last_not_of(const wxString& str, size_t nStart=npos) const;
 741           ///
 742           size_t find_last_not_of(const char* s, size_t nStart = npos) const;
 743           ///
 744           size_t find_last_not_of(char ch, size_t nStart = npos) const;
 745         //@}
 746       //@}
 747
 748       /**
 749         All compare functions return -1, 0 or 1 if the [sub]string
 750         is less, equal or greater than the compare() argument.
 751
 752         @name comparison
 753       */
 754       //@{
 755         /// just like strcmp()
 756         int compare(const wxString& str) const { return Cmp(str); }
 757         /// comparison with a substring
 758         int compare(size_t nStart, size_t nLen, const wxString& str) const;
 759         /// comparison of 2 substrings
 760         int compare(size_t nStart, size_t nLen,
 761                     const wxString& str, size_t nStart2, size_t nLen2) const;
 762         /// just like strcmp()
 763         int compare(const char* sz) const { return Cmp(sz); }
 764         /// substring comparison with first nCount characters of sz
 765         int compare(size_t nStart, size_t nLen,
 766                     const char* sz, size_t nCount = npos) const;
 767       //@}
 768     wxString substr(size_t nStart = 0, size_t nLen = npos) const;
 769   //@}
 770 #endif
 771 };
 772
 773 // ----------------------------------------------------------------------------
 774 /** The string array uses it's knowledge of internal structure of the String
 775     class to optimize string storage. Normally, we would store pointers to
 776     string, but as String is, in fact, itself a pointer (sizeof(String) is
 777     sizeof(char *)) we store these pointers instead. The cast to "String *"
 778     is really all we need to turn such pointer into a string!
 779
 780     Of course, it can be called a dirty hack, but we use twice less memory
 781     and this approach is also more speed efficient, so it's probably worth it.
 782
 783     Usage notes: when a string is added/inserted, a new copy of it is created,
 784     so the original string may be safely deleted. When a string is retrieved
 785     from the array (operator[] or Item() method), a reference is returned.
 786
 787     @name wxArrayString
 788     @memo probably the most commonly used array type - array of strings
 789  */
 790 // ----------------------------------------------------------------------------
 791 class wxArrayString
 792 {
 793 public:
 794   /** @name ctors and dtor */
 795   //@{
 796     /// default ctor
 797   wxArrayString();
 798     /// copy ctor
 799   wxArrayString(const wxArrayString& array);
 800     /// assignment operator
 801   wxArrayString& operator=(const wxArrayString& src);
 802     /// not virtual, this class can't be derived from
 803  ~wxArrayString();
 804   //@}
 805
 806   /** @name memory management */
 807   //@{
 808     /// empties the list, but doesn't release memory
 809   void Empty();
 810     /// empties the list and releases memory
 811   void Clear();
 812     /// preallocates memory for given number of items
 813   void Alloc(size_t nCount);
 814     /// minimzes the memory usage (by freeing all extra memory)
 815   void Shrink();
 816   //@}
 817
 818   /** @name simple accessors */
 819   //@{
 820     /// number of elements in the array
 821   uint  Count() const   { return m_nCount;      }
 822     /// is it empty?
 823   bool  IsEmpty() const { return m_nCount == 0; }
 824   //@}
 825
 826   /** @name items access (range checking is done in debug version) */
 827   //@{
 828     /// get item at position uiIndex
 829   wxString& Item(size_t nIndex) const
 830     { wxASSERT( nIndex < m_nCount ); return *(wxString *)&(m_pItems[nIndex]); }
 831     /// same as Item()
 832   wxString& operator[](size_t nIndex) const { return Item(nIndex); }
 833     /// get last item
 834   wxString& Last() const { wxASSERT( !IsEmpty() ); return Item(Count() - 1); }
 835   //@}
 836
 837   /** @name item management */
 838   //@{
 839     /**
 840       Search the element in the array, starting from the either side
 841       @param if bFromEnd reverse search direction
 842       @param if bCase, comparison is case sensitive (default)
 843       @return index of the first item matched or NOT_FOUND
 844       @see NOT_FOUND
 845      */
 846   int  Index (const char *sz, bool bCase = TRUE, bool bFromEnd = FALSE) const;
 847     /// add new element at the end
 848   void Add   (const wxString& str);
 849     /// add new element at given position
 850   void Insert(const wxString& str, uint uiIndex);
 851     /// remove first item matching this value
 852   void Remove(const char *sz);
 853     /// remove item by index
 854   void Remove(size_t nIndex);
 855   //@}
 856
 857   /// sort array elements
 858   void Sort(bool bCase = TRUE, bool bReverse = FALSE);
 859
 860 private:
 861   void    Grow();     // makes array bigger if needed
 862   void    Free();     // free the string stored
 863
 864   size_t  m_nSize,    // current size of the array
 865           m_nCount;   // current number of elements
 866
 867   char  **m_pItems;   // pointer to data
 868 };
 869
 870 // ---------------------------------------------------------------------------
 871 /** @name wxString comparison functions
 872     @memo Comparisons are case sensitive
 873  */
 874 // ---------------------------------------------------------------------------
 875 //@{
 876 inline bool operator==(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) == 0; }
 877 ///
 878 inline bool operator==(const wxString& s1, const char  * s2) { return s1.Cmp(s2) == 0; }
 879 ///
 880 inline bool operator==(const char  * s1, const wxString& s2) { return s2.Cmp(s1) == 0; }
 881 ///
 882 inline bool operator!=(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) != 0; }
 883 ///
 884 inline bool operator!=(const wxString& s1, const char  * s2) { return s1.Cmp(s2) != 0; }
 885 ///
 886 inline bool operator!=(const char  * s1, const wxString& s2) { return s2.Cmp(s1) != 0; }
 887 ///
 888 inline bool operator< (const wxString& s1, const wxString& s2) { return s1.Cmp(s2) <  0; }
 889 ///
 890 inline bool operator< (const wxString& s1, const char  * s2) { return s1.Cmp(s2) <  0; }
 891 ///
 892 inline bool operator< (const char  * s1, const wxString& s2) { return s2.Cmp(s1) >  0; }
 893 ///
 894 inline bool operator> (const wxString& s1, const wxString& s2) { return s1.Cmp(s2) >  0; }
 895 ///
 896 inline bool operator> (const wxString& s1, const char  * s2) { return s1.Cmp(s2) >  0; }
 897 ///
 898 inline bool operator> (const char  * s1, const wxString& s2) { return s2.Cmp(s1) <  0; }
 899 ///
 900 inline bool operator<=(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) <= 0; }
 901 ///
 902 inline bool operator<=(const wxString& s1, const char  * s2) { return s1.Cmp(s2) <= 0; }
 903 ///
 904 inline bool operator<=(const char  * s1, const wxString& s2) { return s2.Cmp(s1) >= 0; }
 905 ///
 906 inline bool operator>=(const wxString& s1, const wxString& s2) { return s1.Cmp(s2) >= 0; }
 907 ///
 908 inline bool operator>=(const wxString& s1, const char  * s2) { return s1.Cmp(s2) >= 0; }
 909 ///
 910 inline bool operator>=(const char  * s1, const wxString& s2) { return s2.Cmp(s1) <= 0; }
 911 //@}
 912
 913 // ---------------------------------------------------------------------------
 914 /** @name Global functions complementing standard C string library
 915     @memo replacements for strlen() and portable strcasecmp()
 916  */
 917 // ---------------------------------------------------------------------------
 918
 919 #ifdef  STD_STRING_COMPATIBILITY
 920
 921 // fwd decl
 922 class WXDLLEXPORT istream;
 923
 924 istream& WXDLLEXPORT operator>>(istream& is, wxString& str);
 925
 926 #endif  //std::string compatibility
 927
 928 #endif  // __WXSTRINGH__
 929
 930 //@}