// Name: tokenzr.cpp
// Purpose: String tokenizer
// Author: Guilhem Lavaux
-// Modified by:
+// Modified by: Vadim Zeitlin
// Created: 04/22/98
// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
#ifdef __GNUG__
#pragma implementation "tokenzr.h"
#endif
#include "wx/tokenzr.h"
-wxStringTokenizer::wxStringTokenizer(const wxString& to_tokenize,
- const wxString& delims,
- bool ret_delims)
-{
- m_string = to_tokenize;
- m_delims = delims;
- m_retdelims = ret_delims;
-}
+// Required for wxIs... functions
+#include <ctype.h>
-wxStringTokenizer::~wxStringTokenizer()
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxStringTokenizer construction
+// ----------------------------------------------------------------------------
+
+wxStringTokenizer::wxStringTokenizer(const wxString& str,
+ const wxString& delims,
+ wxStringTokenizerMode mode)
{
+ SetString(str, delims, mode);
}
-off_t wxStringTokenizer::FindDelims(const wxString& str, const wxString& delims) const
+void wxStringTokenizer::SetString(const wxString& str,
+ const wxString& delims,
+ wxStringTokenizerMode mode)
{
- for ( size_t i = 0; i < str.Length(); i++ )
+ if ( mode == wxTOKEN_DEFAULT )
{
- wxChar c = str[i];
-
- for ( size_t j = 0; j < delims.Length() ; j++ )
+ // 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 ( delims[j] == c )
- return i;
+ if ( !wxIsspace(*p) )
+ break;
}
- }
- return -1;
-}
-
-int wxStringTokenizer::CountTokens() const
-{
- wxString p_string = m_string;
- bool found = TRUE;
- int pos, count = 1;
-
- if (p_string.Length() == 0)
- return 0;
-
- while (found)
- {
- pos = FindDelims(p_string, m_delims);
- if (pos != -1)
+ if ( *p )
{
- count++;
- p_string = p_string(pos+1, p_string.Length());
+ // not whitespace char in delims
+ mode = wxTOKEN_RET_EMPTY;
}
else
{
- found = FALSE;
+ // only whitespaces
+ mode = wxTOKEN_STRTOK;
}
}
- return count;
+ m_delims = delims;
+ m_mode = mode;
+
+ Reinit(str);
}
-bool wxStringTokenizer::HasMoreTokens()
+void wxStringTokenizer::Reinit(const wxString& str)
{
- return !m_string.IsEmpty();
+ 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();
}
-// needed to fix leading whitespace / mult. delims bugs
-void wxStringTokenizer::EatLeadingDelims()
+// ----------------------------------------------------------------------------
+// access to the tokens
+// ----------------------------------------------------------------------------
+
+// do we have more of them?
+bool wxStringTokenizer::HasMoreTokens() const
{
- int pos;
+ wxCHECK_MSG( IsOk(), FALSE, _T("you should call SetString() first") );
- // while leading delims trim 'em from the left
- while ( ( pos = FindDelims(m_string, m_delims)) == 0 )
+ if ( m_string.find_first_not_of(m_delims) == wxString::npos )
{
- m_string = m_string.Mid((size_t)1);
+ // no non empty tokens left, but in wxTOKEN_RET_EMPTY_ALL mode we
+ // still may return TRUE if GetNextToken() wasn't called yet for the
+ // last trailing empty token
+ return m_mode == wxTOKEN_RET_EMPTY_ALL ? m_hasMore : FALSE;
+ }
+ else
+ {
+ // there are non delimiter characters left, hence we do have more
+ // tokens
+ return TRUE;
}
}
-wxString wxStringTokenizer::NextToken()
+// count the number of tokens in the string
+size_t wxStringTokenizer::CountTokens() const
{
- off_t pos, pos2;
- wxString r_string;
+ wxCHECK_MSG( IsOk(), 0, _T("you should call SetString() first") );
- if ( m_string.IsEmpty() )
- return m_string;
+ // 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;
- if ( !m_retdelims )
- EatLeadingDelims();
-
- pos = FindDelims(m_string, m_delims);
- if (pos == -1)
+ size_t count = 0;
+ while ( self->HasMoreTokens() )
{
- r_string = m_string;
- m_string = wxEmptyString;
+ count++;
- return r_string;
+ (void)self->GetNextToken();
}
- if (m_retdelims)
+ self->Reinit(stringInitial);
+
+ return count;
+}
+
+// ----------------------------------------------------------------------------
+// token extraction
+// ----------------------------------------------------------------------------
+
+wxString wxStringTokenizer::GetNextToken()
+{
+ // strtok() doesn't return empty tokens, all other modes do
+ bool allowEmpty = m_mode != wxTOKEN_STRTOK;
+
+ wxString token;
+ do
{
- if (!pos)
+ if ( !HasMoreTokens() )
{
- pos++;
- pos2 = 1;
+ break;
+ }
+ // 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 )
+ {
+ // no more delimiters, the token is everything till the end of
+ // string
+ token = m_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
{
- pos2 = pos;
+ size_t pos2 = pos + 1;
+
+ // 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);
+
+ // keep track of the position in the original string too
+ m_pos += pos2;
}
}
- else
- {
- pos2 = pos + 1;
- }
-
- r_string = m_string.Left((size_t)pos);
- m_string = m_string.Mid((size_t)pos2);
+ while ( !allowEmpty && token.empty() );
- return r_string;
+ return token;
}
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