X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f4ada568223b79c8a5769cc351c36a8e2ccd7841..135ce19c6765c1163b63071ed84443da989cac7a:/src/common/tokenzr.cpp

diff --git a/src/common/tokenzr.cpp b/src/common/tokenzr.cpp
index eb99237711..b6272da149 100644
--- a/src/common/tokenzr.cpp
+++ b/src/common/tokenzr.cpp
@@ -2,103 +2,197 @@
 // 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"
+    #pragma implementation "tokenzr.h"
+#endif
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
 #endif
 
-#include "wx/object.h"
-#include "wx/string.h"
 #include "wx/tokenzr.h"
 
-wxStringTokenizer::wxStringTokenizer(const wxString& to_tokenize,
+// Required for wxIs... functions
+#include <ctype.h>
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxStringTokenizer construction
+// ----------------------------------------------------------------------------
+
+wxStringTokenizer::wxStringTokenizer(const wxString& str,
                                      const wxString& delims,
-				     bool ret_delims)
-  : wxObject()
+                                     wxStringTokenizerMode mode)
 {
-  m_string = to_tokenize;
-  m_delims = delims;
-  m_retdelims = ret_delims;
+    SetString(str, delims, mode);
 }
 
-wxStringTokenizer::~wxStringTokenizer()
+void wxStringTokenizer::SetString(const wxString& str,
+                                  const wxString& delims,
+                                  wxStringTokenizerMode mode)
 {
+    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_mode = mode;
+
+    Reinit(str);
 }
 
-off_t wxStringTokenizer::FindDelims(const wxString& str, const wxString& delims)
+void wxStringTokenizer::Reinit(const wxString& str)
 {
-  int i, j;
-  register int s_len = str.Length(),
-               len = delims.Length();
-
-  for (i=0;i<s_len;i++) {
-    register char c = str[i];
-
-    for (j=0;j<len;j++)
-      if (delims[j] == c)
-        return i;
-  }
-  return -1;
+    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();
 }
 
-int wxStringTokenizer::CountTokens()
+// ----------------------------------------------------------------------------
+// access to the tokens
+// ----------------------------------------------------------------------------
+
+// do we have more of them?
+bool wxStringTokenizer::HasMoreTokens() 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) {
-      count++;
-      p_string = p_string(0, pos);
-    } else
-      found = FALSE;
-  }
-  return count;
+    wxCHECK_MSG( IsOk(), FALSE, _T("you should call SetString() first") );
+
+    if ( m_string.find_first_not_of(m_delims) == wxString::npos )
+    {
+        // 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;
+    }
 }
 
-bool wxStringTokenizer::HasMoreToken()
+// count the number of tokens in the string
+size_t wxStringTokenizer::CountTokens() const
 {
-  return (m_string.Length() != 0);
+    wxCHECK_MSG( IsOk(), 0, _T("you should call SetString() first") );
+
+    // 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;
+
+    size_t count = 0;
+    while ( self->HasMoreTokens() )
+    {
+        count++;
+
+        (void)self->GetNextToken();
+    }
+
+    self->Reinit(stringInitial);
+
+    return count;
 }
 
-wxString wxStringTokenizer::NextToken()
+// ----------------------------------------------------------------------------
+// token extraction
+// ----------------------------------------------------------------------------
+
+wxString wxStringTokenizer::GetNextToken()
 {
-  register off_t pos, pos2;
-  wxString r_string;
-
-  if (m_string.IsNull())
-    return m_string;
-
-  pos = FindDelims(m_string, m_delims);
-  if (pos == -1) {
-    r_string = m_string;
-    m_string = (char *)NULL;
-    
-    return r_string;
-  }
-
-  if (m_retdelims) {
-    if (!pos) {
-      pos++;
-      pos2 = 1;
-    } else
-      pos2 = pos;
-  } else
-      pos2 = pos + 1;
-  
-  r_string = m_string.Left((size_t)pos);
-  m_string = m_string.Mid((size_t)pos2);
-
-  return r_string;
+    // strtok() doesn't return empty tokens, all other modes do
+    bool allowEmpty = m_mode != wxTOKEN_STRTOK;
+
+    wxString token;
+    do
+    {
+        if ( !HasMoreTokens() )
+        {
+            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
+        {
+            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;
+        }
+    }
+    while ( !allowEmpty && token.empty() );
+
+    return token;
 }