| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: tokenzr.cpp |
| 3 | // Purpose: String tokenizer |
| 4 | // Author: Guilhem Lavaux |
| 5 | // Modified by: Vadim Zeitlin (almost full rewrite) |
| 6 | // Created: 04/22/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Guilhem Lavaux |
| 9 | // Licence: wxWindows licence |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // ============================================================================ |
| 13 | // declarations |
| 14 | // ============================================================================ |
| 15 | |
| 16 | // ---------------------------------------------------------------------------- |
| 17 | // headers |
| 18 | // ---------------------------------------------------------------------------- |
| 19 | |
| 20 | #ifdef __GNUG__ |
| 21 | #pragma implementation "tokenzr.h" |
| 22 | #endif |
| 23 | |
| 24 | // For compilers that support precompilation, includes "wx.h". |
| 25 | #include "wx/wxprec.h" |
| 26 | |
| 27 | #ifdef __BORLANDC__ |
| 28 | #pragma hdrstop |
| 29 | #endif |
| 30 | |
| 31 | #include "wx/tokenzr.h" |
| 32 | |
| 33 | // Required for wxIs... functions |
| 34 | #include <ctype.h> |
| 35 | |
| 36 | // ============================================================================ |
| 37 | // implementation |
| 38 | // ============================================================================ |
| 39 | |
| 40 | // ---------------------------------------------------------------------------- |
| 41 | // wxStringTokenizer construction |
| 42 | // ---------------------------------------------------------------------------- |
| 43 | |
| 44 | wxStringTokenizer::wxStringTokenizer(const wxString& str, |
| 45 | const wxString& delims, |
| 46 | wxStringTokenizerMode mode) |
| 47 | { |
| 48 | SetString(str, delims, mode); |
| 49 | } |
| 50 | |
| 51 | void wxStringTokenizer::SetString(const wxString& str, |
| 52 | const wxString& delims, |
| 53 | wxStringTokenizerMode mode) |
| 54 | { |
| 55 | if ( mode == wxTOKEN_DEFAULT ) |
| 56 | { |
| 57 | // by default, we behave like strtok() if the delimiters are only |
| 58 | // whitespace characters and as wxTOKEN_RET_EMPTY otherwise (for |
| 59 | // whitespace delimiters, strtok() behaviour is better because we want |
| 60 | // to count consecutive spaces as one delimiter) |
| 61 | const wxChar *p; |
| 62 | for ( p = delims.c_str(); *p; p++ ) |
| 63 | { |
| 64 | if ( !wxIsspace(*p) ) |
| 65 | break; |
| 66 | } |
| 67 | |
| 68 | if ( *p ) |
| 69 | { |
| 70 | // not whitespace char in delims |
| 71 | mode = wxTOKEN_RET_EMPTY; |
| 72 | } |
| 73 | else |
| 74 | { |
| 75 | // only whitespaces |
| 76 | mode = wxTOKEN_STRTOK; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | m_delims = delims; |
| 81 | m_mode = mode; |
| 82 | |
| 83 | Reinit(str); |
| 84 | } |
| 85 | |
| 86 | void wxStringTokenizer::Reinit(const wxString& str) |
| 87 | { |
| 88 | wxASSERT_MSG( IsOk(), _T("you should call SetString() first") ); |
| 89 | |
| 90 | m_string = str; |
| 91 | m_pos = 0; |
| 92 | |
| 93 | // empty string doesn't have any tokens |
| 94 | m_hasMore = !m_string.empty(); |
| 95 | } |
| 96 | |
| 97 | // ---------------------------------------------------------------------------- |
| 98 | // access to the tokens |
| 99 | // ---------------------------------------------------------------------------- |
| 100 | |
| 101 | // do we have more of them? |
| 102 | bool wxStringTokenizer::HasMoreTokens() const |
| 103 | { |
| 104 | wxCHECK_MSG( IsOk(), FALSE, _T("you should call SetString() first") ); |
| 105 | |
| 106 | if ( m_string.find_first_not_of(m_delims) == wxString::npos ) |
| 107 | { |
| 108 | // no non empty tokens left, but in 2 cases we still may return TRUE if |
| 109 | // GetNextToken() wasn't called yet for this empty token: |
| 110 | // |
| 111 | // a) in wxTOKEN_RET_EMPTY_ALL mode we always do it |
| 112 | // b) in wxTOKEN_RET_EMPTY mode we do it in the special case of a |
| 113 | // string containing only the delimiter: then there is an empty |
| 114 | // token just before it |
| 115 | return (m_mode == wxTOKEN_RET_EMPTY_ALL) || |
| 116 | (m_mode == wxTOKEN_RET_EMPTY && m_pos == 0) |
| 117 | ? m_hasMore : FALSE; |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | // there are non delimiter characters left, hence we do have more |
| 122 | // tokens |
| 123 | return TRUE; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | // count the number of tokens in the string |
| 128 | size_t wxStringTokenizer::CountTokens() const |
| 129 | { |
| 130 | wxCHECK_MSG( IsOk(), 0, _T("you should call SetString() first") ); |
| 131 | |
| 132 | // VZ: this function is IMHO not very useful, so it's probably not very |
| 133 | // important if it's implementation here is not as efficient as it |
| 134 | // could be - but OTOH like this we're sure to get the correct answer |
| 135 | // in all modes |
| 136 | wxStringTokenizer *self = (wxStringTokenizer *)this; // const_cast |
| 137 | wxString stringInitial = m_string; |
| 138 | |
| 139 | size_t count = 0; |
| 140 | while ( self->HasMoreTokens() ) |
| 141 | { |
| 142 | count++; |
| 143 | |
| 144 | (void)self->GetNextToken(); |
| 145 | } |
| 146 | |
| 147 | self->Reinit(stringInitial); |
| 148 | |
| 149 | return count; |
| 150 | } |
| 151 | |
| 152 | // ---------------------------------------------------------------------------- |
| 153 | // token extraction |
| 154 | // ---------------------------------------------------------------------------- |
| 155 | |
| 156 | wxString wxStringTokenizer::GetNextToken() |
| 157 | { |
| 158 | // strtok() doesn't return empty tokens, all other modes do |
| 159 | bool allowEmpty = m_mode != wxTOKEN_STRTOK; |
| 160 | |
| 161 | wxString token; |
| 162 | do |
| 163 | { |
| 164 | if ( !HasMoreTokens() ) |
| 165 | { |
| 166 | break; |
| 167 | } |
| 168 | // find the end of this token |
| 169 | size_t pos = m_string.find_first_of(m_delims); |
| 170 | |
| 171 | // and the start of the next one |
| 172 | if ( pos == wxString::npos ) |
| 173 | { |
| 174 | // no more delimiters, the token is everything till the end of |
| 175 | // string |
| 176 | token = m_string; |
| 177 | |
| 178 | m_pos += m_string.length(); |
| 179 | m_string.clear(); |
| 180 | |
| 181 | // no more tokens in this string, even in wxTOKEN_RET_EMPTY_ALL |
| 182 | // mode (we will return the trailing one right now in this case) |
| 183 | m_hasMore = FALSE; |
| 184 | } |
| 185 | else |
| 186 | { |
| 187 | size_t pos2 = pos + 1; |
| 188 | |
| 189 | // in wxTOKEN_RET_DELIMS mode we return the delimiter character |
| 190 | // with token |
| 191 | token = wxString(m_string, m_mode == wxTOKEN_RET_DELIMS ? pos2 |
| 192 | : pos); |
| 193 | |
| 194 | // remove token with the following it delimiter from string |
| 195 | m_string.erase(0, pos2); |
| 196 | |
| 197 | // keep track of the position in the original string too |
| 198 | m_pos += pos2; |
| 199 | } |
| 200 | } |
| 201 | while ( !allowEmpty && token.empty() ); |
| 202 | |
| 203 | return token; |
| 204 | } |
| 205 | |
| 206 | // ---------------------------------------------------------------------------- |
| 207 | // public functions |
| 208 | // ---------------------------------------------------------------------------- |
| 209 | |
| 210 | wxArrayString wxStringTokenize(const wxString& str, |
| 211 | const wxString& delims, |
| 212 | wxStringTokenizerMode mode) |
| 213 | { |
| 214 | wxArrayString tokens; |
| 215 | wxStringTokenizer tk(str, delims, mode); |
| 216 | while ( tk.HasMoreTokens() ) |
| 217 | { |
| 218 | tokens.Add(tk.GetNextToken()); |
| 219 | } |
| 220 | |
| 221 | return tokens; |
| 222 | } |