include/wx/regex.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/regex.h
   3 // Purpose:     regular expression matching
   4 // Author:      Karsten Ballüder
   5 // Modified by: VZ at 13.07.01 (integrated to wxWin)
   6 // Created:     05.02.2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 Karsten Ballüder <ballueder@gmx.net>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_REGEX_H_
  13 #define _WX_REGEX_H_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "regex.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20
  21 #if wxUSE_REGEX
  22
  23 class WXDLLEXPORT wxString;
  24
  25 // ----------------------------------------------------------------------------
  26 // constants
  27 // ----------------------------------------------------------------------------
  28
  29 // flags for regex compilation: these can be used with Compile()
  30 enum
  31 {
  32     // use extended regex syntax (default)
  33     wxRE_EXTENDED = 0,
  34
  35     // use basic RE syntax
  36     wxRE_BASIC    = 2,
  37
  38     // ignore case in match
  39     wxRE_ICASE    = 4,
  40
  41     // only check match, don't set back references
  42     wxRE_NOSUB    = 8,
  43
  44     // if not set, treat '\n' as an ordinary character, otherwise it is
  45     // special: it is not matched by '.' and '^' and '$' always match
  46     // after/before it regardless of the setting of wxRE_NOT[BE]OL
  47     wxRE_NEWLINE  = 16,
  48
  49     // default flags
  50     wxRE_DEFAULT  = wxRE_EXTENDED
  51 };
  52
  53 // flags for regex matching: these can be used with Matches()
  54 //
  55 // these flags are mainly useful when doing several matches in a long string,
  56 // they can be used to prevent erroneous matches for '^' and '$'
  57 enum
  58 {
  59     // '^' doesn't match at the start of line
  60     wxRE_NOTBOL = 32,
  61
  62     // '$' doesn't match at the end of line
  63     wxRE_NOTEOL = 64
  64 };
  65
  66 // ----------------------------------------------------------------------------
  67 // wxRegEx: a regular expression
  68 // ----------------------------------------------------------------------------
  69
  70 class WXDLLEXPORT wxRegExImpl;
  71
  72 class WXDLLEXPORT wxRegEx
  73 {
  74 public:
  75     // default ctor: use Compile() later
  76     wxRegEx() { Init(); }
  77
  78     // create and compile
  79     wxRegEx(const wxString& expr, int flags = wxRE_DEFAULT)
  80     {
  81         Init();
  82         (void)Compile(expr, flags);
  83     }
  84
  85     // return TRUE if this is a valid compiled regular expression
  86     bool IsValid() const { return m_impl != NULL; }
  87
  88     // compile the string into regular expression, return TRUE if ok or FALSE
  89     // if string has a syntax error
  90     bool Compile(const wxString& pattern, int flags = wxRE_DEFAULT);
  91
  92     // matches the precompiled regular expression against a string, return
  93     // TRUE if matches and FALSE otherwise
  94     //
  95     // flags may be combination of wxRE_NOTBOL and wxRE_NOTEOL
  96     //
  97     // may only be called after successful call to Compile()
  98     bool Matches(const wxChar *text, int flags = 0) const;
  99
 100     // get the start index and the length of the match of the expression
 101     // (index 0) or a bracketed subexpression (index != 0)
 102     //
 103     // may only be called after successful call to Matches()
 104     //
 105     // return FALSE if no match or on error
 106     bool GetMatch(size_t *start, size_t *len, size_t index = 0) const;
 107
 108     // return the part of string corresponding to the match, empty string is
 109     // returned if match failed
 110     //
 111     // may only be called after successful call to Matches()
 112     wxString GetMatch(const wxString& text, size_t index = 0) const;
 113
 114     // replaces the current regular expression in the string pointed to by
 115     // pattern, with the text in replacement and return number of matches
 116     // replaced (maybe 0 if none found) or -1 on error
 117     //
 118     // the replacement text may contain backreferences (\number) which will be
 119     // replaced with the value of the corresponding subexpression in the
 120     // pattern match
 121     //
 122     // maxMatches may be used to limit the number of replacements made, setting
 123     // it to 1, for example, will only replace first occurence (if any) of the
 124     // pattern in the text while default value of 0 means replace all
 125     int Replace(wxString *text, const wxString& replacement,
 126                 size_t maxMatches = 0) const;
 127
 128     // replace the first occurence
 129     int ReplaceFirst(wxString *text, const wxString& replacement) const
 130         { return Replace(text, replacement, 1); }
 131
 132     // replace all occurences: this is actually a synonym for Replace()
 133     int ReplaceAll(wxString *text, const wxString& replacement) const
 134         { return Replace(text, replacement, 0); }
 135
 136     // dtor not virtual, don't derive from this class
 137     ~wxRegEx();
 138
 139 private:
 140     // common part of all ctors
 141     void Init();
 142
 143     // the real guts of this class
 144     wxRegExImpl *m_impl;
 145
 146     // as long as the class wxRegExImpl is not ref-counted,
 147     // instances of the handle wxRegEx must not be copied.
 148     wxRegEx(const wxRegEx&);
 149     wxRegEx &operator=(const wxRegEx&);
 150 };
 151
 152 #endif // wxUSE_REGEX
 153
 154 #endif // _WX_REGEX_H_
 155