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Made wxClientDC's use safe as per wxMSW.
[wxWidgets.git] / 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 #ifndef _WX_WXSTRINGH__
13 #define _WX_WXSTRINGH__
14
15 #ifdef __GNUG__
16 #pragma interface "string.h"
17 #endif
18
19 #ifdef __WXMAC__
20 #include <ctype.h>
21 #endif
22
23 #include <string.h>
24 #include <stdio.h>
25 #include <stdarg.h>
26 #include <limits.h>
27 #include <stdlib.h>
28
29 #ifdef HAVE_STRINGS_H
30 #include <strings.h> // for strcasecmp()
31 #endif // AIX
32
33 #ifndef WX_PRECOMP
34 #include "wx/defs.h"
35
36 #ifdef WXSTRING_IS_WXOBJECT
37 #include "wx/object.h"
38 #endif
39 #endif // !PCH
40
41 #include "wx/debug.h"
42 #include "wx/wxchar.h"
43 #include "wx/buffer.h"
44
45 /*
46 Efficient string class [more or less] compatible with MFC CString,
47 wxWindows version 1 wxString and std::string and some handy functions
48 missing from string.h.
49 */
50
51 // ---------------------------------------------------------------------------
52 // macros
53 // ---------------------------------------------------------------------------
54
55 // compile the std::string compatibility functions if defined
56 #define wxSTD_STRING_COMPATIBILITY
57
58 // define to derive wxString from wxObject
59 #ifdef WXSTRING_IS_WXOBJECT
60 #undef WXSTRING_IS_WXOBJECT
61 #endif
62
63 // maximum possible length for a string means "take all string" everywhere
64 // (as sizeof(StringData) is unknown here we substract 100)
65 const unsigned int wxSTRING_MAXLEN = UINT_MAX - 100;
66
67 // 'naughty' cast
68 #define WXSTRINGCAST (wxChar *)(const wxChar *)
69 #define WXCSTRINGCAST (wxChar *)(const wxChar *)
70 #define MBSTRINGCAST (char *)(const char *)
71 #define WCSTRINGCAST (wchar_t *)(const wchar_t *)
72
73 // implementation only
74 #define ASSERT_VALID_INDEX(i) wxASSERT( (unsigned)(i) <= Len() )
75
76 // ---------------------------------------------------------------------------
77 // Global functions complementing standard C string library replacements for
78 // strlen() and portable strcasecmp()
79 //---------------------------------------------------------------------------
80 // USE wx* FUNCTIONS IN wx/wxchar.h INSTEAD - THIS IS ONLY FOR BINARY COMPATIBILITY
81
82 // checks whether the passed in pointer is NULL and if the string is empty
83 inline bool WXDLLEXPORT IsEmpty(const char *p) { return (!p || !*p); }
84
85 // safe version of strlen() (returns 0 if passed NULL pointer)
86 inline size_t WXDLLEXPORT Strlen(const char *psz)
87 { return psz ? strlen(psz) : 0; }
88
89 // portable strcasecmp/_stricmp
90 inline int WXDLLEXPORT Stricmp(const char *psz1, const char *psz2)
91 {
92 #if defined(__VISUALC__) || ( defined(__MWERKS__) && defined(__INTEL__) )
93 return _stricmp(psz1, psz2);
94 #elif defined(__SC__)
95 return _stricmp(psz1, psz2);
96 #elif defined(__SALFORDC__)
97 return stricmp(psz1, psz2);
98 #elif defined(__BORLANDC__)
99 return stricmp(psz1, psz2);
100 #elif defined(__WATCOMC__)
101 return stricmp(psz1, psz2);
102 #elif defined(__UNIX__) || defined(__GNUWIN32__)
103 return strcasecmp(psz1, psz2);
104 #elif defined(__MWERKS__) && !defined(__INTEL__)
105 register char c1, c2;
106 do {
107 c1 = tolower(*psz1++);
108 c2 = tolower(*psz2++);
109 } while ( c1 && (c1 == c2) );
110
111 return c1 - c2;
112 #else
113 // almost all compilers/libraries provide this function (unfortunately under
114 // different names), that's why we don't implement our own which will surely
115 // be more efficient than this code (uncomment to use):
116 /*
117 register char c1, c2;
118 do {
119 c1 = tolower(*psz1++);
120 c2 = tolower(*psz2++);
121 } while ( c1 && (c1 == c2) );
122
123 return c1 - c2;
124 */
125
126 #error "Please define string case-insensitive compare for your OS/compiler"
127 #endif // OS/compiler
128 }
129
130 // ----------------------------------------------------------------------------
131 // global data
132 // ----------------------------------------------------------------------------
133
134 WXDLLEXPORT_DATA(extern const wxChar*) wxEmptyString;
135
136 // global pointer to empty string
137 WXDLLEXPORT_DATA(extern const wxChar*) g_szNul;
138
139 // return an empty wxString
140 class WXDLLEXPORT wxString; // not yet defined
141 inline const wxString& wxGetEmptyString() { return *(wxString *)&g_szNul; }
142
143 // ---------------------------------------------------------------------------
144 // string data prepended with some housekeeping info (used by wxString class),
145 // is never used directly (but had to be put here to allow inlining)
146 // ---------------------------------------------------------------------------
147 struct WXDLLEXPORT wxStringData
148 {
149 int nRefs; // reference count
150 size_t nDataLength, // actual string length
151 nAllocLength; // allocated memory size
152
153 // mimics declaration 'wxChar data[nAllocLength]'
154 wxChar* data() const { return (wxChar*)(this + 1); }
155
156 // empty string has a special ref count so it's never deleted
157 bool IsEmpty() const { return (nRefs == -1); }
158 bool IsShared() const { return (nRefs > 1); }
159
160 // lock/unlock
161 void Lock() { if ( !IsEmpty() ) nRefs++; }
162 void Unlock() { if ( !IsEmpty() && --nRefs == 0) free(this); }
163
164 // if we had taken control over string memory (GetWriteBuf), it's
165 // intentionally put in invalid state
166 void Validate(bool b) { nRefs = (b ? 1 : 0); }
167 bool IsValid() const { return (nRefs != 0); }
168 };
169
170 // ---------------------------------------------------------------------------
171 // types of multibyte<->Unicode conversions
172 // ---------------------------------------------------------------------------
173 #if wxUSE_WCHAR_T
174 class WXDLLEXPORT wxMBConv
175 {
176 public:
177 virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
178 virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
179 // No longer inline since BC++ complains.
180 const wxWCharBuffer cMB2WC(const char *psz) const;
181 const wxCharBuffer cWC2MB(const wchar_t *psz) const;
182 #if wxUSE_UNICODE
183 const wxWCharBuffer cMB2WX(const char *psz) const { return cMB2WC(psz); }
184 const wxCharBuffer cWX2MB(const wchar_t *psz) const { return cWC2MB(psz); }
185 const wchar_t* cWC2WX(const wchar_t *psz) const { return psz; }
186 const wchar_t* cMB2WC(const wchar_t *psz) const { return psz; }
187 #else
188 const char* cMB2WX(const char *psz) const { return psz; }
189 const char* cWX2MB(const char *psz) const { return psz; }
190 const wxCharBuffer cWC2WX(const wchar_t *psz) const { return cWC2MB(psz); }
191 const wxWCharBuffer cWX2WC(const char *psz) const { return cMB2WC(psz); }
192 #endif
193 };
194 WXDLLEXPORT_DATA(extern wxMBConv) wxConvLibc;
195 #define wxConv_libc wxConvLibc
196
197 #define wxANOTHER_MBCONV(type) \
198 class type : public wxMBConv { \
199 public: \
200 virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const; \
201 virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const; \
202 }
203
204 WXDLLEXPORT_DATA(extern wxANOTHER_MBCONV(wxMBConvFile)) wxConvFile;
205 #define wxConv_file wxConvFile
206 WXDLLEXPORT_DATA(extern wxANOTHER_MBCONV(wxMBConvUTF7)) wxConvUTF7;
207 WXDLLEXPORT_DATA(extern wxANOTHER_MBCONV(wxMBConvUTF8)) wxConvUTF8;
208 #define wxConv_UTF8 wxConvUTF8
209 #if defined(__WXGTK12__)
210 WXDLLEXPORT_DATA(extern wxANOTHER_MBCONV(wxMBConvGdk)) wxConvGdk;
211 #define wxConv_gdk wxConvGdk
212 #endif // GTK > 1.0
213
214 class wxCharacterSet;
215 class WXDLLEXPORT wxCSConv : public wxMBConv
216 {
217 private:
218 wxChar *m_name;
219 wxCharacterSet *m_cset;
220 bool m_deferred;
221 void SetName(const wxChar *charset);
222 public:
223 wxCSConv(const wxChar *charset);
224 virtual ~wxCSConv();
225 void LoadNow();
226 virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
227 virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
228 };
229
230 WXDLLEXPORT_DATA(extern wxCSConv) wxConvLocal;
231 #define wxConv_local wxConvLocal
232
233 WXDLLEXPORT_DATA(extern wxMBConv *) wxConvCurrent;
234 #define wxConv_current wxConvCurrent
235
236 // filenames are multibyte on Unix and probably widechar on Windows?
237 #if defined(__UNIX__) || defined(__BORLANDC__)
238 #define wxMBFILES 1
239 #else
240 #define wxMBFILES 0
241 #endif
242
243 #if wxMBFILES
244 #define wxFNCONV(name) wxConvFile.cWX2MB(name)
245 #define FNSTRINGCAST MBSTRINGCAST
246 #else
247 #define wxFNCONV(name) name
248 #define FNSTRINGCAST WXSTRINGCAST
249 #endif
250 #else//!wxUSE_WCHAR_T
251 class WXDLLEXPORT wxMBConv {
252 public:
253 const char* cMB2WX(const char *psz) const { return psz; }
254 const char* cWX2MB(const char *psz) const { return psz; }
255 };
256 WXDLLEXPORT_DATA(extern wxMBConv) wxConvLibc, wxConvFile;
257 #define wxConv_libc wxConvLibc
258 #define wxConv_file wxConvFile
259 WXDLLEXPORT_DATA(extern wxMBConv *) wxConvCurrent;
260 #define wxConv_current wxConvCurrent
261 #define wxFNCONV(name) name
262 #define FNSTRINGCAST WXSTRINGCAST
263 #endif//wxUSE_WCHAR_T
264
265 // ---------------------------------------------------------------------------
266 // This is (yet another one) String class for C++ programmers. It doesn't use
267 // any of "advanced" C++ features (i.e. templates, exceptions, namespaces...)
268 // thus you should be able to compile it with practicaly any C++ compiler.
269 // This class uses copy-on-write technique, i.e. identical strings share the
270 // same memory as long as neither of them is changed.
271 //
272 // This class aims to be as compatible as possible with the new standard
273 // std::string class, but adds some additional functions and should be at
274 // least as efficient than the standard implementation.
275 //
276 // Performance note: it's more efficient to write functions which take "const
277 // String&" arguments than "const char *" if you assign the argument to
278 // another string.
279 //
280 // It was compiled and tested under Win32, Linux (libc 5 & 6), Solaris 5.5.
281 //
282 // To do:
283 // - ressource support (string tables in ressources)
284 // - more wide character (UNICODE) support
285 // - regular expressions support
286 // ---------------------------------------------------------------------------
287
288 #ifdef WXSTRING_IS_WXOBJECT
289 class WXDLLEXPORT wxString : public wxObject
290 {
291 DECLARE_DYNAMIC_CLASS(wxString)
292 #else //WXSTRING_IS_WXOBJECT
293 class WXDLLEXPORT wxString
294 {
295 #endif //WXSTRING_IS_WXOBJECT
296
297 friend class WXDLLEXPORT wxArrayString;
298
299 // NB: special care was taken in arranging the member functions in such order
300 // that all inline functions can be effectively inlined, verify that all
301 // performace critical functions are still inlined if you change order!
302 private:
303 // points to data preceded by wxStringData structure with ref count info
304 wxChar *m_pchData;
305
306 // accessor to string data
307 wxStringData* GetStringData() const { return (wxStringData*)m_pchData - 1; }
308
309 // string (re)initialization functions
310 // initializes the string to the empty value (must be called only from
311 // ctors, use Reinit() otherwise)
312 void Init() { m_pchData = (wxChar *)g_szNul; }
313 // initializaes the string with (a part of) C-string
314 void InitWith(const wxChar *psz, size_t nPos = 0, size_t nLen = wxSTRING_MAXLEN);
315 // as Init, but also frees old data
316 void Reinit() { GetStringData()->Unlock(); Init(); }
317
318 // memory allocation
319 // allocates memory for string of lenght nLen
320 void AllocBuffer(size_t nLen);
321 // copies data to another string
322 void AllocCopy(wxString&, int, int) const;
323 // effectively copies data to string
324 void AssignCopy(size_t, const wxChar *);
325
326 // append a (sub)string
327 void ConcatSelf(int nLen, const wxChar *src);
328
329 // functions called before writing to the string: they copy it if there
330 // are other references to our data (should be the only owner when writing)
331 void CopyBeforeWrite();
332 void AllocBeforeWrite(size_t);
333
334 // this method is not implemented - there is _no_ conversion from int to
335 // string, you're doing something wrong if the compiler wants to call it!
336 //
337 // try `s << i' or `s.Printf("%d", i)' instead
338 wxString(int);
339 wxString(long);
340
341 public:
342 // constructors and destructor
343 // ctor for an empty string
344 wxString() { Init(); }
345 // copy ctor
346 wxString(const wxString& stringSrc)
347 {
348 wxASSERT( stringSrc.GetStringData()->IsValid() );
349
350 if ( stringSrc.IsEmpty() ) {
351 // nothing to do for an empty string
352 Init();
353 }
354 else {
355 m_pchData = stringSrc.m_pchData; // share same data
356 GetStringData()->Lock(); // => one more copy
357 }
358 }
359 // string containing nRepeat copies of ch
360 wxString(wxChar ch, size_t nRepeat = 1);
361 // ctor takes first nLength characters from C string
362 // (default value of wxSTRING_MAXLEN means take all the string)
363 wxString(const wxChar *psz, size_t nLength = wxSTRING_MAXLEN)
364 { InitWith(psz, 0, nLength); }
365 #if wxUSE_UNICODE
366 // from multibyte string
367 // (NB: nLength is right now number of Unicode characters, not
368 // characters in psz! So try not to use it yet!)
369 wxString(const char *psz, wxMBConv& conv = wxConvLibc, size_t nLength = wxSTRING_MAXLEN);
370 // from wxWCharBuffer (i.e. return from wxGetString)
371 wxString(const wxWCharBuffer& psz)
372 { InitWith(psz, 0, wxSTRING_MAXLEN); }
373 #else
374 // from C string (for compilers using unsigned char)
375 wxString(const unsigned char* psz, size_t nLength = wxSTRING_MAXLEN)
376 { InitWith((const char*)psz, 0, nLength); }
377 // from multibyte string
378 wxString(const char *psz, wxMBConv& WXUNUSED(conv), size_t nLength = wxSTRING_MAXLEN)
379 { InitWith(psz, 0, nLength); }
380 #if wxUSE_WCHAR_T
381 // from wide (Unicode) string
382 wxString(const wchar_t *pwz);
383 #endif
384 // from wxCharBuffer
385 wxString(const wxCharBuffer& psz)
386 { InitWith(psz, 0, wxSTRING_MAXLEN); }
387 #endif
388 // dtor is not virtual, this class must not be inherited from!
389 ~wxString() { GetStringData()->Unlock(); }
390
391 // generic attributes & operations
392 // as standard strlen()
393 size_t Len() const { return GetStringData()->nDataLength; }
394 // string contains any characters?
395 bool IsEmpty() const { return Len() == 0; }
396 // empty string is "FALSE", so !str will return TRUE
397 bool operator!() const { return IsEmpty(); }
398 // empty string contents
399 void Empty()
400 {
401 if ( !IsEmpty() )
402 Reinit();
403
404 // should be empty
405 wxASSERT( GetStringData()->nDataLength == 0 );
406 }
407 // empty the string and free memory
408 void Clear()
409 {
410 if ( !GetStringData()->IsEmpty() )
411 Reinit();
412
413 wxASSERT( GetStringData()->nDataLength == 0 ); // should be empty
414 wxASSERT( GetStringData()->nAllocLength == 0 ); // and not own any memory
415 }
416
417 // contents test
418 // Is an ascii value
419 bool IsAscii() const;
420 // Is a number
421 bool IsNumber() const;
422 // Is a word
423 bool IsWord() const;
424
425 // data access (all indexes are 0 based)
426 // read access
427 wxChar GetChar(size_t n) const
428 { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
429 // read/write access
430 wxChar& GetWritableChar(size_t n)
431 { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
432 // write access
433 void SetChar(size_t n, wxChar ch)
434 { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); m_pchData[n] = ch; }
435
436 // get last character
437 wxChar Last() const
438 { wxASSERT( !IsEmpty() ); return m_pchData[Len() - 1]; }
439 // get writable last character
440 wxChar& Last()
441 { wxASSERT( !IsEmpty() ); CopyBeforeWrite(); return m_pchData[Len()-1]; }
442
443 // under Unix it is tested with configure, assume it works on other
444 // platforms (there might be overloading problems if size_t and int are
445 // the same type)
446 #if !defined(__UNIX__) || wxUSE_SIZE_T_STRING_OPERATOR
447 // operator version of GetChar
448 wxChar operator[](size_t n) const
449 { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
450 #endif
451
452 // operator version of GetChar
453 wxChar operator[](int n) const
454 { ASSERT_VALID_INDEX( n ); return m_pchData[n]; }
455 // operator version of GetWritableChar
456 wxChar& operator[](size_t n)
457 { ASSERT_VALID_INDEX( n ); CopyBeforeWrite(); return m_pchData[n]; }
458
459 // implicit conversion to C string
460 operator const wxChar*() const { return m_pchData; }
461 // explicit conversion to C string (use this with printf()!)
462 const wxChar* c_str() const { return m_pchData; }
463 // (and this with [wx]Printf()!)
464 const wxChar* wx_str() const { return m_pchData; }
465 //
466 const wxChar* GetData() const { return m_pchData; }
467 #if wxUSE_UNICODE
468 const wxCharBuffer mb_str(wxMBConv& conv = wxConvLibc) const { return conv.cWC2MB(m_pchData); }
469 const wxChar* wc_str(wxMBConv& WXUNUSED(conv) = wxConvLibc) const { return m_pchData; }
470 #if wxMBFILES
471 const wxCharBuffer fn_str() const { return mb_str(wxConvFile); }
472 #else
473 const wxChar* fn_str() const { return m_pchData; }
474 #endif
475 #else
476 const wxChar* mb_str(wxMBConv& WXUNUSED(conv) = wxConvLibc ) const { return m_pchData; }
477 #if wxUSE_WCHAR_T
478 const wxWCharBuffer wc_str(wxMBConv& conv) const { return conv.cMB2WC(m_pchData); }
479 #endif
480 const wxChar* fn_str() const { return m_pchData; }
481 #endif
482 // for convenience
483 const wxWX2MBbuf mbc_str() const { return mb_str(*wxConvCurrent); }
484
485 // overloaded assignment
486 // from another wxString
487 wxString& operator=(const wxString& stringSrc);
488 // from a character
489 wxString& operator=(wxChar ch);
490 // from a C string
491 wxString& operator=(const wxChar *psz);
492 #if wxUSE_UNICODE
493 // from wxWCharBuffer
494 wxString& operator=(const wxWCharBuffer& psz) { return operator=((const wchar_t *)psz); }
495 #else
496 // from another kind of C string
497 wxString& operator=(const unsigned char* psz);
498 #if wxUSE_WCHAR_T
499 // from a wide string
500 wxString& operator=(const wchar_t *pwz);
501 #endif
502 // from wxCharBuffer
503 wxString& operator=(const wxCharBuffer& psz) { return operator=((const char *)psz); }
504 #endif
505
506 // string concatenation
507 // in place concatenation
508 /*
509 Concatenate and return the result. Note that the left to right
510 associativity of << allows to write things like "str << str1 << str2
511 << ..." (unlike with +=)
512 */
513 // string += string
514 wxString& operator<<(const wxString& s)
515 {
516 wxASSERT( s.GetStringData()->IsValid() );
517
518 ConcatSelf(s.Len(), s);
519 return *this;
520 }
521 // string += C string
522 wxString& operator<<(const wxChar *psz)
523 { ConcatSelf(wxStrlen(psz), psz); return *this; }
524 // string += char
525 wxString& operator<<(wxChar ch) { ConcatSelf(1, &ch); return *this; }
526
527 // string += string
528 void operator+=(const wxString& s) { (void)operator<<(s); }
529 // string += C string
530 void operator+=(const wxChar *psz) { (void)operator<<(psz); }
531 // string += char
532 void operator+=(wxChar ch) { (void)operator<<(ch); }
533
534 // string += buffer (i.e. from wxGetString)
535 #if wxUSE_UNICODE
536 wxString& operator<<(const wxWCharBuffer& s) { (void)operator<<((const wchar_t *)s); return *this; }
537 void operator+=(const wxWCharBuffer& s) { (void)operator<<((const wchar_t *)s); }
538 #else
539 wxString& operator<<(const wxCharBuffer& s) { (void)operator<<((const char *)s); return *this; }
540 void operator+=(const wxCharBuffer& s) { (void)operator<<((const char *)s); }
541 #endif
542
543 // string += C string
544 wxString& Append(const wxChar* psz)
545 { ConcatSelf(wxStrlen(psz), psz); return *this; }
546 // append count copies of given character
547 wxString& Append(wxChar ch, size_t count = 1u)
548 { wxString str(ch, count); return *this << str; }
549
550 // prepend a string, return the string itself
551 wxString& Prepend(const wxString& str)
552 { *this = str + *this; return *this; }
553
554 // non-destructive concatenation
555 //
556 friend wxString WXDLLEXPORT operator+(const wxString& string1, const wxString& string2);
557 //
558 friend wxString WXDLLEXPORT operator+(const wxString& string, wxChar ch);
559 //
560 friend wxString WXDLLEXPORT operator+(wxChar ch, const wxString& string);
561 //
562 friend wxString WXDLLEXPORT operator+(const wxString& string, const wxChar *psz);
563 //
564 friend wxString WXDLLEXPORT operator+(const wxChar *psz, const wxString& string);
565
566 // stream-like functions
567 // insert an int into string
568 wxString& operator<<(int i);
569 // insert a float into string
570 wxString& operator<<(float f);
571 // insert a double into string
572 wxString& operator<<(double d);
573
574 // string comparison
575 // case-sensitive comparison (returns a value < 0, = 0 or > 0)
576 int Cmp(const wxChar *psz) const { return wxStrcmp(c_str(), psz); }
577 // same as Cmp() but not case-sensitive
578 int CmpNoCase(const wxChar *psz) const { return wxStricmp(c_str(), psz); }
579 // test for the string equality, either considering case or not
580 // (if compareWithCase then the case matters)
581 bool IsSameAs(const wxChar *psz, bool compareWithCase = TRUE) const
582 { return (compareWithCase ? Cmp(psz) : CmpNoCase(psz)) == 0; }
583
584 // simple sub-string extraction
585 // return substring starting at nFirst of length nCount (or till the end
586 // if nCount = default value)
587 wxString Mid(size_t nFirst, size_t nCount = wxSTRING_MAXLEN) const;
588
589 // operator version of Mid()
590 wxString operator()(size_t start, size_t len) const
591 { return Mid(start, len); }
592
593 // get first nCount characters
594 wxString Left(size_t nCount) const;
595 // get last nCount characters
596 wxString Right(size_t nCount) const;
597 // get all characters before the first occurence of ch
598 // (returns the whole string if ch not found)
599 wxString BeforeFirst(wxChar ch) const;
600 // get all characters before the last occurence of ch
601 // (returns empty string if ch not found)
602 wxString BeforeLast(wxChar ch) const;
603 // get all characters after the first occurence of ch
604 // (returns empty string if ch not found)
605 wxString AfterFirst(wxChar ch) const;
606 // get all characters after the last occurence of ch
607 // (returns the whole string if ch not found)
608 wxString AfterLast(wxChar ch) const;
609
610 // for compatibility only, use more explicitly named functions above
611 wxString Before(wxChar ch) const { return BeforeLast(ch); }
612 wxString After(wxChar ch) const { return AfterFirst(ch); }
613
614 // case conversion
615 // convert to upper case in place, return the string itself
616 wxString& MakeUpper();
617 // convert to upper case, return the copy of the string
618 // Here's something to remember: BC++ doesn't like returns in inlines.
619 wxString Upper() const ;
620 // convert to lower case in place, return the string itself
621 wxString& MakeLower();
622 // convert to lower case, return the copy of the string
623 wxString Lower() const ;
624
625 // trimming/padding whitespace (either side) and truncating
626 // remove spaces from left or from right (default) side
627 wxString& Trim(bool bFromRight = TRUE);
628 // add nCount copies chPad in the beginning or at the end (default)
629 wxString& Pad(size_t nCount, wxChar chPad = _T(' '), bool bFromRight = TRUE);
630 // truncate string to given length
631 wxString& Truncate(size_t uiLen);
632
633 // searching and replacing
634 // searching (return starting index, or -1 if not found)
635 int Find(wxChar ch, bool bFromEnd = FALSE) const; // like strchr/strrchr
636 // searching (return starting index, or -1 if not found)
637 int Find(const wxChar *pszSub) const; // like strstr
638 // replace first (or all of bReplaceAll) occurences of substring with
639 // another string, returns the number of replacements made
640 size_t Replace(const wxChar *szOld,
641 const wxChar *szNew,
642 bool bReplaceAll = TRUE);
643
644 // check if the string contents matches a mask containing '*' and '?'
645 bool Matches(const wxChar *szMask) const;
646
647 // formated input/output
648 // as sprintf(), returns the number of characters written or < 0 on error
649 int Printf(const wxChar *pszFormat, ...);
650 // as vprintf(), returns the number of characters written or < 0 on error
651 int PrintfV(const wxChar* pszFormat, va_list argptr);
652
653 // raw access to string memory
654 // ensure that string has space for at least nLen characters
655 // only works if the data of this string is not shared
656 void Alloc(size_t nLen);
657 // minimize the string's memory
658 // only works if the data of this string is not shared
659 void Shrink();
660 // get writable buffer of at least nLen bytes. Unget() *must* be called
661 // a.s.a.p. to put string back in a reasonable state!
662 wxChar *GetWriteBuf(size_t nLen);
663 // call this immediately after GetWriteBuf() has been used
664 void UngetWriteBuf();
665
666 // wxWindows version 1 compatibility functions
667
668 // use Mid()
669 wxString SubString(size_t from, size_t to) const
670 { return Mid(from, (to - from + 1)); }
671 // values for second parameter of CompareTo function
672 enum caseCompare {exact, ignoreCase};
673 // values for first parameter of Strip function
674 enum stripType {leading = 0x1, trailing = 0x2, both = 0x3};
675
676 // use Printf()
677 int sprintf(const wxChar *pszFormat, ...);
678
679 // use Cmp()
680 inline int CompareTo(const wxChar* psz, caseCompare cmp = exact) const
681 { return cmp == exact ? Cmp(psz) : CmpNoCase(psz); }
682
683 // use Len
684 size_t Length() const { return Len(); }
685 // Count the number of characters
686 int Freq(wxChar ch) const;
687 // use MakeLower
688 void LowerCase() { MakeLower(); }
689 // use MakeUpper
690 void UpperCase() { MakeUpper(); }
691 // use Trim except that it doesn't change this string
692 wxString Strip(stripType w = trailing) const;
693
694 // use Find (more general variants not yet supported)
695 size_t Index(const wxChar* psz) const { return Find(psz); }
696 size_t Index(wxChar ch) const { return Find(ch); }
697 // use Truncate
698 wxString& Remove(size_t pos) { return Truncate(pos); }
699 wxString& RemoveLast() { return Truncate(Len() - 1); }
700
701 wxString& Remove(size_t nStart, size_t nLen) { return erase( nStart, nLen ); }
702
703 // use Find()
704 int First( const wxChar ch ) const { return Find(ch); }
705 int First( const wxChar* psz ) const { return Find(psz); }
706 int First( const wxString &str ) const { return Find(str); }
707 int Last( const wxChar ch ) const { return Find(ch, TRUE); }
708 bool Contains(const wxString& str) const { return Find(str) != -1; }
709
710 // use IsEmpty()
711 bool IsNull() const { return IsEmpty(); }
712
713 #ifdef wxSTD_STRING_COMPATIBILITY
714 // std::string compatibility functions
715
716 // an 'invalid' value for string index
717 static const size_t npos;
718
719 // constructors
720 // take nLen chars starting at nPos
721 wxString(const wxString& str, size_t nPos, size_t nLen)
722 {
723 wxASSERT( str.GetStringData()->IsValid() );
724 InitWith(str.c_str(), nPos, nLen == npos ? 0 : nLen);
725 }
726 // take all characters from pStart to pEnd
727 wxString(const void *pStart, const void *pEnd);
728
729 // lib.string.capacity
730 // return the length of the string
731 size_t size() const { return Len(); }
732 // return the length of the string
733 size_t length() const { return Len(); }
734 // return the maximum size of the string
735 size_t max_size() const { return wxSTRING_MAXLEN; }
736 // resize the string, filling the space with c if c != 0
737 void resize(size_t nSize, wxChar ch = _T('\0'));
738 // delete the contents of the string
739 void clear() { Empty(); }
740 // returns true if the string is empty
741 bool empty() const { return IsEmpty(); }
742
743 // lib.string.access
744 // return the character at position n
745 wxChar at(size_t n) const { return GetChar(n); }
746 // returns the writable character at position n
747 wxChar& at(size_t n) { return GetWritableChar(n); }
748
749 // lib.string.modifiers
750 // append a string
751 wxString& append(const wxString& str)
752 { *this += str; return *this; }
753 // append elements str[pos], ..., str[pos+n]
754 wxString& append(const wxString& str, size_t pos, size_t n)
755 { ConcatSelf(n, str.c_str() + pos); return *this; }
756 // append first n (or all if n == npos) characters of sz
757 wxString& append(const wxChar *sz, size_t n = npos)
758 { ConcatSelf(n == npos ? wxStrlen(sz) : n, sz); return *this; }
759
760 // append n copies of ch
761 wxString& append(size_t n, wxChar ch) { return Pad(n, ch); }
762
763 // same as `this_string = str'
764 wxString& assign(const wxString& str) { return (*this) = str; }
765 // same as ` = str[pos..pos + n]
766 wxString& assign(const wxString& str, size_t pos, size_t n)
767 { return *this = wxString((const wxChar *)str + pos, n); }
768 // same as `= first n (or all if n == npos) characters of sz'
769 wxString& assign(const wxChar *sz, size_t n = npos)
770 { return *this = wxString(sz, n); }
771 // same as `= n copies of ch'
772 wxString& assign(size_t n, wxChar ch)
773 { return *this = wxString(ch, n); }
774
775 // insert another string
776 wxString& insert(size_t nPos, const wxString& str);
777 // insert n chars of str starting at nStart (in str)
778 wxString& insert(size_t nPos, const wxString& str, size_t nStart, size_t n)
779 { return insert(nPos, wxString((const wxChar *)str + nStart, n)); }
780
781 // insert first n (or all if n == npos) characters of sz
782 wxString& insert(size_t nPos, const wxChar *sz, size_t n = npos)
783 { return insert(nPos, wxString(sz, n)); }
784 // insert n copies of ch
785 wxString& insert(size_t nPos, size_t n, wxChar ch)
786 { return insert(nPos, wxString(ch, n)); }
787
788 // delete characters from nStart to nStart + nLen
789 wxString& erase(size_t nStart = 0, size_t nLen = npos);
790
791 // replaces the substring of length nLen starting at nStart
792 wxString& replace(size_t nStart, size_t nLen, const wxChar* sz);
793 // replaces the substring with nCount copies of ch
794 wxString& replace(size_t nStart, size_t nLen, size_t nCount, wxChar ch);
795 // replaces a substring with another substring
796 wxString& replace(size_t nStart, size_t nLen,
797 const wxString& str, size_t nStart2, size_t nLen2);
798 // replaces the substring with first nCount chars of sz
799 wxString& replace(size_t nStart, size_t nLen,
800 const wxChar* sz, size_t nCount);
801
802 // swap two strings
803 void swap(wxString& str);
804
805 // All find() functions take the nStart argument which specifies the
806 // position to start the search on, the default value is 0. All functions
807 // return npos if there were no match.
808
809 // find a substring
810 size_t find(const wxString& str, size_t nStart = 0) const;
811
812 // VC++ 1.5 can't cope with this syntax.
813 #if !defined(__VISUALC__) || defined(__WIN32__)
814 // find first n characters of sz
815 size_t find(const wxChar* sz, size_t nStart = 0, size_t n = npos) const;
816 #endif
817
818 // Gives a duplicate symbol (presumably a case-insensitivity problem)
819 #if !defined(__BORLANDC__)
820 // find the first occurence of character ch after nStart
821 size_t find(wxChar ch, size_t nStart = 0) const;
822 #endif
823 // rfind() family is exactly like find() but works right to left
824
825 // as find, but from the end
826 size_t rfind(const wxString& str, size_t nStart = npos) const;
827
828 // VC++ 1.5 can't cope with this syntax.
829 #if !defined(__VISUALC__) || defined(__WIN32__)
830 // as find, but from the end
831 size_t rfind(const wxChar* sz, size_t nStart = npos,
832 size_t n = npos) const;
833 // as find, but from the end
834 size_t rfind(wxChar ch, size_t nStart = npos) const;
835 #endif
836
837 // find first/last occurence of any character in the set
838
839 // as strpbrk() but starts at nStart, returns npos if not found
840 size_t find_first_of(const wxString& str, size_t nStart = 0) const
841 { return find_first_of(str.c_str(), nStart); }
842 // same as above
843 size_t find_first_of(const wxChar* sz, size_t nStart = 0) const;
844 // same as find(char, size_t)
845 size_t find_first_of(wxChar c, size_t nStart = 0) const
846 { return find(c, nStart); }
847 // find the last (starting from nStart) char from str in this string
848 size_t find_last_of (const wxString& str, size_t nStart = npos) const
849 { return find_last_of(str.c_str(), nStart); }
850 // same as above
851 size_t find_last_of (const wxChar* sz, size_t nStart = npos) const;
852 // same as above
853 size_t find_last_of(wxChar c, size_t nStart = npos) const
854 { return rfind(c, nStart); }
855
856 // find first/last occurence of any character not in the set
857
858 // as strspn() (starting from nStart), returns npos on failure
859 size_t find_first_not_of(const wxString& str, size_t nStart = 0) const
860 { return find_first_not_of(str.c_str(), nStart); }
861 // same as above
862 size_t find_first_not_of(const wxChar* sz, size_t nStart = 0) const;
863 // same as above
864 size_t find_first_not_of(wxChar ch, size_t nStart = 0) const;
865 // as strcspn()
866 size_t find_last_not_of(const wxString& str, size_t nStart=npos) const;
867 // same as above
868 size_t find_last_not_of(const wxChar* sz, size_t nStart = npos) const;
869 // same as above
870 size_t find_last_not_of(wxChar ch, size_t nStart = npos) const;
871
872 // All compare functions return -1, 0 or 1 if the [sub]string is less,
873 // equal or greater than the compare() argument.
874
875 // just like strcmp()
876 int compare(const wxString& str) const { return Cmp(str); }
877 // comparison with a substring
878 int compare(size_t nStart, size_t nLen, const wxString& str) const;
879 // comparison of 2 substrings
880 int compare(size_t nStart, size_t nLen,
881 const wxString& str, size_t nStart2, size_t nLen2) const;
882 // just like strcmp()
883 int compare(const wxChar* sz) const { return Cmp(sz); }
884 // substring comparison with first nCount characters of sz
885 int compare(size_t nStart, size_t nLen,
886 const wxChar* sz, size_t nCount = npos) const;
887
888 // substring extraction
889 wxString substr(size_t nStart = 0, size_t nLen = npos) const;
890 #endif // wxSTD_STRING_COMPATIBILITY
891 };
892
893 // ----------------------------------------------------------------------------
894 // The string array uses it's knowledge of internal structure of the wxString
895 // class to optimize string storage. Normally, we would store pointers to
896 // string, but as wxString is, in fact, itself a pointer (sizeof(wxString) is
897 // sizeof(char *)) we store these pointers instead. The cast to "wxString *" is
898 // really all we need to turn such pointer into a string!
899 //
900 // Of course, it can be called a dirty hack, but we use twice less memory and
901 // this approach is also more speed efficient, so it's probably worth it.
902 //
903 // Usage notes: when a string is added/inserted, a new copy of it is created,
904 // so the original string may be safely deleted. When a string is retrieved
905 // from the array (operator[] or Item() method), a reference is returned.
906 // ----------------------------------------------------------------------------
907 class WXDLLEXPORT wxArrayString
908 {
909 public:
910 // type of function used by wxArrayString::Sort()
911 typedef int (*CompareFunction)(const wxString& first,
912 const wxString& second);
913
914 // constructors and destructor
915 // default ctor
916 wxArrayString();
917 // copy ctor
918 wxArrayString(const wxArrayString& array);
919 // assignment operator
920 wxArrayString& operator=(const wxArrayString& src);
921 // not virtual, this class should not be derived from
922 ~wxArrayString();
923
924 // memory management
925 // empties the list, but doesn't release memory
926 void Empty();
927 // empties the list and releases memory
928 void Clear();
929 // preallocates memory for given number of items
930 void Alloc(size_t nCount);
931 // minimzes the memory usage (by freeing all extra memory)
932 void Shrink();
933
934 // simple accessors
935 // number of elements in the array
936 size_t GetCount() const { return m_nCount; }
937 // is it empty?
938 bool IsEmpty() const { return m_nCount == 0; }
939 // number of elements in the array (GetCount is preferred API)
940 size_t Count() const { return m_nCount; }
941
942 // items access (range checking is done in debug version)
943 // get item at position uiIndex
944 wxString& Item(size_t nIndex) const
945 { wxASSERT( nIndex < m_nCount ); return *(wxString *)&(m_pItems[nIndex]); }
946 // same as Item()
947 wxString& operator[](size_t nIndex) const { return Item(nIndex); }
948 // get last item
949 wxString& Last() const { wxASSERT( !IsEmpty() ); return Item(Count() - 1); }
950
951 // item management
952 // Search the element in the array, starting from the beginning if
953 // bFromEnd is FALSE or from end otherwise. If bCase, comparison is case
954 // sensitive (default). Returns index of the first item matched or
955 // wxNOT_FOUND
956 int Index (const wxChar *sz, bool bCase = TRUE, bool bFromEnd = FALSE) const;
957 // add new element at the end
958 void Add(const wxString& str);
959 // add new element at given position
960 void Insert(const wxString& str, size_t uiIndex);
961 // remove first item matching this value
962 void Remove(const wxChar *sz);
963 // remove item by index
964 void Remove(size_t nIndex);
965
966 // sorting
967 // sort array elements in alphabetical order (or reversed alphabetical
968 // order if reverseOrder parameter is TRUE)
969 void Sort(bool reverseOrder = FALSE);
970 // sort array elements using specified comparaison function
971 void Sort(CompareFunction compareFunction);
972
973 private:
974 void Grow(); // makes array bigger if needed
975 void Free(); // free the string stored
976
977 void DoSort(); // common part of all Sort() variants
978
979 size_t m_nSize, // current size of the array
980 m_nCount; // current number of elements
981
982 wxChar **m_pItems; // pointer to data
983 };
984
985 // ---------------------------------------------------------------------------
986 // wxString comparison functions: operator versions are always case sensitive
987 // ---------------------------------------------------------------------------
988 //
989 inline bool operator==(const wxString& s1, const wxString& s2) { return (s1.Cmp(s2) == 0); }
990 //
991 inline bool operator==(const wxString& s1, const wxChar * s2) { return (s1.Cmp(s2) == 0); }
992 //
993 inline bool operator==(const wxChar * s1, const wxString& s2) { return (s2.Cmp(s1) == 0); }
994 //
995 inline bool operator!=(const wxString& s1, const wxString& s2) { return (s1.Cmp(s2) != 0); }
996 //
997 inline bool operator!=(const wxString& s1, const wxChar * s2) { return (s1.Cmp(s2) != 0); }
998 //
999 inline bool operator!=(const wxChar * s1, const wxString& s2) { return (s2.Cmp(s1) != 0); }
1000 //
1001 inline bool operator< (const wxString& s1, const wxString& s2) { return (s1.Cmp(s2) < 0); }
1002 //
1003 inline bool operator< (const wxString& s1, const wxChar * s2) { return (s1.Cmp(s2) < 0); }
1004 //
1005 inline bool operator< (const wxChar * s1, const wxString& s2) { return (s2.Cmp(s1) > 0); }
1006 //
1007 inline bool operator> (const wxString& s1, const wxString& s2) { return (s1.Cmp(s2) > 0); }
1008 //
1009 inline bool operator> (const wxString& s1, const wxChar * s2) { return (s1.Cmp(s2) > 0); }
1010 //
1011 inline bool operator> (const wxChar * s1, const wxString& s2) { return (s2.Cmp(s1) < 0); }
1012 //
1013 inline bool operator<=(const wxString& s1, const wxString& s2) { return (s1.Cmp(s2) <= 0); }
1014 //
1015 inline bool operator<=(const wxString& s1, const wxChar * s2) { return (s1.Cmp(s2) <= 0); }
1016 //
1017 inline bool operator<=(const wxChar * s1, const wxString& s2) { return (s2.Cmp(s1) >= 0); }
1018 //
1019 inline bool operator>=(const wxString& s1, const wxString& s2) { return (s1.Cmp(s2) >= 0); }
1020 //
1021 inline bool operator>=(const wxString& s1, const wxChar * s2) { return (s1.Cmp(s2) >= 0); }
1022 //
1023 inline bool operator>=(const wxChar * s1, const wxString& s2) { return (s2.Cmp(s1) <= 0); }
1024
1025 wxString WXDLLEXPORT operator+(const wxString& string1, const wxString& string2);
1026 wxString WXDLLEXPORT operator+(const wxString& string, wxChar ch);
1027 wxString WXDLLEXPORT operator+(wxChar ch, const wxString& string);
1028 wxString WXDLLEXPORT operator+(const wxString& string, const wxChar *psz);
1029 wxString WXDLLEXPORT operator+(const wxChar *psz, const wxString& string);
1030 #if wxUSE_UNICODE
1031 inline wxString WXDLLEXPORT operator+(const wxString& string, const wxWCharBuffer& buf)
1032 { return string + (const wchar_t *)buf; }
1033 inline wxString WXDLLEXPORT operator+(const wxWCharBuffer& buf, const wxString& string)
1034 { return (const wchar_t *)buf + string; }
1035 #else
1036 inline wxString WXDLLEXPORT operator+(const wxString& string, const wxCharBuffer& buf)
1037 { return string + (const char *)buf; }
1038 inline wxString WXDLLEXPORT operator+(const wxCharBuffer& buf, const wxString& string)
1039 { return (const char *)buf + string; }
1040 #endif
1041
1042 // ---------------------------------------------------------------------------
1043 // Implementation only from here until the end of file
1044 // ---------------------------------------------------------------------------
1045
1046 #ifdef wxSTD_STRING_COMPATIBILITY
1047
1048 #include "wx/ioswrap.h"
1049
1050 WXDLLEXPORT istream& operator>>(istream& is, wxString& str);
1051
1052 #endif // wxSTD_STRING_COMPATIBILITY
1053
1054 #endif // _WX_WXSTRINGH__
wxWidgets (Impactor)