// Name: tokenzr.cpp
// Purpose: String tokenizer
// Author: Guilhem Lavaux
-// Modified by: Vadim Zeitlin
+// Modified by: Vadim Zeitlin (almost full rewrite)
// Created: 04/22/98
// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
#include "wx/tokenzr.h"
+// Required for wxIs... functions
+#include <ctype.h>
+
// ============================================================================
// implementation
// ============================================================================
// wxStringTokenizer construction
// ----------------------------------------------------------------------------
-wxStringTokenizer::wxStringTokenizer(const wxString& to_tokenize,
+wxStringTokenizer::wxStringTokenizer(const wxString& str,
const wxString& delims,
- bool ret_delims)
+ wxStringTokenizerMode mode)
{
- SetString(to_tokenize, delims, ret_delims);
+ SetString(str, delims, mode);
}
-void wxStringTokenizer::SetString(const wxString& to_tokenize,
+void wxStringTokenizer::SetString(const wxString& str,
const wxString& delims,
- bool ret_delim)
+ wxStringTokenizerMode mode)
{
- m_string = to_tokenize;
+ if ( mode == wxTOKEN_DEFAULT )
+ {
+ // by default, we behave like strtok() if the delimiters are only
+ // whitespace characters and as wxTOKEN_RET_EMPTY otherwise (for
+ // whitespace delimiters, strtok() behaviour is better because we want
+ // to count consecutive spaces as one delimiter)
+ const wxChar *p;
+ for ( p = delims.c_str(); *p; p++ )
+ {
+ if ( !wxIsspace(*p) )
+ break;
+ }
+
+ if ( *p )
+ {
+ // not whitespace char in delims
+ mode = wxTOKEN_RET_EMPTY;
+ }
+ else
+ {
+ // only whitespaces
+ mode = wxTOKEN_STRTOK;
+ }
+ }
+
m_delims = delims;
- m_retdelims = ret_delim;
- m_pos = 0;
+ m_mode = mode;
- // empty string doesn't have any tokens
- m_hasMore = !m_string.empty();
+ Reinit(str);
}
-wxStringTokenizer::~wxStringTokenizer()
+void wxStringTokenizer::Reinit(const wxString& str)
{
+ wxASSERT_MSG( IsOk(), _T("you should call SetString() first") );
+
+ m_string = str;
+ m_pos = 0;
+
+ // empty string doesn't have any tokens
+ m_hasMore = !m_string.empty();
}
// ----------------------------------------------------------------------------
-// count the number of tokens in the string
+// access to the tokens
// ----------------------------------------------------------------------------
-size_t wxStringTokenizer::CountTokens() const
+// do we have more of them?
+bool wxStringTokenizer::HasMoreTokens() const
{
- size_t pos = 0;
- size_t count = 0;
- for ( ;; )
+ wxCHECK_MSG( IsOk(), FALSE, _T("you should call SetString() first") );
+
+ if ( m_string.find_first_not_of(m_delims) == wxString::npos )
{
- pos = m_string.find_first_of(m_delims, pos);
- if ( pos == wxString::npos )
- break;
+ // no non empty tokens left, but in 2 cases we still may return TRUE if
+ // GetNextToken() wasn't called yet for this empty token:
+ //
+ // a) in wxTOKEN_RET_EMPTY_ALL mode we always do it
+ // b) in wxTOKEN_RET_EMPTY mode we do it in the special case of a
+ // string containing only the delimiter: then there is an empty
+ // token just before it
+ return (m_mode == wxTOKEN_RET_EMPTY_ALL) ||
+ (m_mode == wxTOKEN_RET_EMPTY && m_pos == 0)
+ ? m_hasMore : FALSE;
+ }
+ else
+ {
+ // there are non delimiter characters left, hence we do have more
+ // tokens
+ return TRUE;
+ }
+}
- count++; // one more token found
+// count the number of tokens in the string
+size_t wxStringTokenizer::CountTokens() const
+{
+ wxCHECK_MSG( IsOk(), 0, _T("you should call SetString() first") );
- pos++; // skip delimiter
- }
+ // VZ: this function is IMHO not very useful, so it's probably not very
+ // important if it's implementation here is not as efficient as it
+ // could be - but OTOH like this we're sure to get the correct answer
+ // in all modes
+ wxStringTokenizer *self = (wxStringTokenizer *)this; // const_cast
+ wxString stringInitial = m_string;
- // normally, we didn't count the last token in the loop above - so add it
- // unless the string was empty from the very beginning, in which case it
- // still has 0 (and not 1) tokens
- if ( !m_string.empty() )
+ size_t count = 0;
+ while ( self->HasMoreTokens() )
{
count++;
+
+ (void)self->GetNextToken();
}
+ self->Reinit(stringInitial);
+
return count;
}
wxString wxStringTokenizer::GetNextToken()
{
+ // strtok() doesn't return empty tokens, all other modes do
+ bool allowEmpty = m_mode != wxTOKEN_STRTOK;
+
wxString token;
- if ( HasMoreTokens() )
+ do
{
- size_t pos = m_string.find_first_of(m_delims); // end of token
- size_t pos2; // start of the next one
- if ( pos != wxString::npos )
+ if ( !HasMoreTokens() )
{
- // return the delimiter too
- pos2 = pos + 1;
+ break;
}
- else
+ // find the end of this token
+ size_t pos = m_string.find_first_of(m_delims);
+
+ // and the start of the next one
+ if ( pos == wxString::npos )
{
- pos2 = m_string.length();
+ // no more delimiters, the token is everything till the end of
+ // string
+ token = m_string;
- // no more tokens in this string
+ m_pos += m_string.length();
+ m_string.clear();
+
+ // no more tokens in this string, even in wxTOKEN_RET_EMPTY_ALL
+ // mode (we will return the trailing one right now in this case)
m_hasMore = FALSE;
}
+ else
+ {
+ size_t pos2 = pos + 1;
- token = wxString(m_string, m_retdelims ? pos2 : pos);
+ // in wxTOKEN_RET_DELIMS mode we return the delimiter character
+ // with token
+ token = wxString(m_string, m_mode == wxTOKEN_RET_DELIMS ? pos2
+ : pos);
- // remove token with the following it delimiter from string
- m_string.erase(0, pos2);
+ // remove token with the following it delimiter from string
+ m_string.erase(0, pos2);
- // keep track of the position in the original string too
- m_pos += pos2;
+ // keep track of the position in the original string too
+ m_pos += pos2;
+ }
}
- //else: no more tokens, return empty token
+ while ( !allowEmpty && token.empty() );
return token;
}
+
+// ----------------------------------------------------------------------------
+// public functions
+// ----------------------------------------------------------------------------
+
+wxArrayString wxStringTokenize(const wxString& str,
+ const wxString& delims,
+ wxStringTokenizerMode mode)
+{
+ wxArrayString tokens;
+ wxStringTokenizer tk(str, delims, mode);
+ while ( tk.HasMoreTokens() )
+ {
+ tokens.Add(tk.GetNextToken());
+ }
+
+ return tokens;
+}
projects / wxWidgets.git / blobdiff