X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ce3ed50dbe32d118321082db84c3a9abb047d5b7..b404a8f3b072129c107c6d9a5e0f6f53cd34807b:/src/common/tokenzr.cpp

diff --git a/src/common/tokenzr.cpp b/src/common/tokenzr.cpp
index 34079c0f66..2822025bb7 100644
--- a/src/common/tokenzr.cpp
+++ b/src/common/tokenzr.cpp
@@ -1,114 +1,296 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        tokenzr.cpp
+// Name:        src/common/tokenzr.cpp
 // Purpose:     String tokenizer
 // Author:      Guilhem Lavaux
-// Modified by:
+// Modified by: Vadim Zeitlin (almost full rewrite)
 // Created:     04/22/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "tokenzr.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
+#include "wx/tokenzr.h"
+
 #ifndef WX_PRECOMP
+    #include "wx/arrstr.h"
+    #include "wx/crt.h"
 #endif
 
-#include "wx/object.h"
-#include "wx/string.h"
-#include "wx/tokenzr.h"
+// Required for wxIs... functions
+#include <ctype.h>
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// helpers
+// ----------------------------------------------------------------------------
+
+static wxString::const_iterator
+find_first_of(const wxChar *delims, size_t len,
+              const wxString::const_iterator& from,
+              const wxString::const_iterator& end)
+{
+    wxASSERT_MSG( from <= end,  wxT("invalid index") );
+
+    for ( wxString::const_iterator i = from; i != end; ++i )
+    {
+        if ( wxTmemchr(delims, *i, len) )
+            return i;
+    }
+
+    return end;
+}
+
+static wxString::const_iterator
+find_first_not_of(const wxChar *delims, size_t len,
+                  const wxString::const_iterator& from,
+                  const wxString::const_iterator& end)
+{
+    wxASSERT_MSG( from <= end,  wxT("invalid index") );
 
-wxStringTokenizer::wxStringTokenizer(const wxString& to_tokenize,
+    for ( wxString::const_iterator i = from; i != end; ++i )
+    {
+        if ( !wxTmemchr(delims, *i, len) )
+            return i;
+    }
+
+    return end;
+}
+
+// ----------------------------------------------------------------------------
+// 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)
+        wxString::const_iterator p;
+        for ( p = delims.begin(); p != delims.end(); ++p )
+        {
+            if ( !wxIsspace(*p) )
+                break;
+        }
+
+        if ( p != delims.end() )
+        {
+            // not whitespace char in delims
+            mode = wxTOKEN_RET_EMPTY;
+        }
+        else
+        {
+            // only whitespaces
+            mode = wxTOKEN_STRTOK;
+        }
+    }
+
+#if wxUSE_UNICODE // FIXME-UTF8: only wc_str()
+    m_delims = delims.wc_str();
+#else
+    m_delims = delims.mb_str();
+#endif
+    m_delimsLen = delims.length();
+
+    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(), wxT("you should call SetString() first") );
+
+    m_string = str;
+    m_stringEnd = m_string.end();
+    m_pos = m_string.begin();
+    m_lastDelim = wxT('\0');
+    m_hasMoreTokens = MoreTokens_Unknown;
 }
 
-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;
+    // GetNextToken() calls HasMoreTokens() and so HasMoreTokens() is called
+    // twice in every interation in the following common usage patten:
+    //     while ( HasMoreTokens() )
+    //        GetNextToken();
+    // We optimize this case by caching HasMoreTokens() return value here:
+    if ( m_hasMoreTokens == MoreTokens_Unknown )
+    {
+        bool r = DoHasMoreTokens();
+        wxConstCast(this, wxStringTokenizer)->m_hasMoreTokens =
+            r ? MoreTokens_Yes : MoreTokens_No;
+        return r;
+    }
+    else
+        return m_hasMoreTokens == MoreTokens_Yes;
 }
 
-bool wxStringTokenizer::HasMoreToken()
+bool wxStringTokenizer::DoHasMoreTokens() const
 {
-  return (m_string.Length() != 0);
+    wxCHECK_MSG( IsOk(), false, wxT("you should call SetString() first") );
+
+    if ( find_first_not_of(m_delims, m_delimsLen, m_pos, m_stringEnd)
+         != m_stringEnd )
+    {
+        // there are non delimiter characters left, so we do have more tokens
+        return true;
+    }
+
+    switch ( m_mode )
+    {
+        case wxTOKEN_RET_EMPTY:
+        case wxTOKEN_RET_DELIMS:
+            // special hack for wxTOKEN_RET_EMPTY: we should return the initial
+            // empty token even if there are only delimiters after it
+            return !m_string.empty() && m_pos == m_string.begin();
+
+        case wxTOKEN_RET_EMPTY_ALL:
+            // special hack for wxTOKEN_RET_EMPTY_ALL: we can know if we had
+            // already returned the trailing empty token after the last
+            // delimiter by examining m_lastDelim: it is set to NUL if we run
+            // up to the end of the string in GetNextToken(), but if it is not
+            // NUL yet we still have this last token to return even if m_pos is
+            // already at m_string.length()
+            return m_pos < m_stringEnd || m_lastDelim != wxT('\0');
+
+        case wxTOKEN_INVALID:
+        case wxTOKEN_DEFAULT:
+            wxFAIL_MSG( wxT("unexpected tokenizer mode") );
+            // fall through
+
+        case wxTOKEN_STRTOK:
+            // never return empty delimiters
+            break;
+    }
+
+    return false;
+}
+
+// count the number of (remaining) tokens in the string
+size_t wxStringTokenizer::CountTokens() const
+{
+    wxCHECK_MSG( IsOk(), 0, wxT("you should call SetString() first") );
+
+    // VZ: this function is IMHO not very useful, so it's probably not very
+    //     important if its 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 tkz(wxString(m_pos, m_stringEnd), m_delims, m_mode);
+
+    size_t count = 0;
+    while ( tkz.HasMoreTokens() )
+    {
+        count++;
+
+        (void)tkz.GetNextToken();
+    }
+
+    return count;
+}
+
+// ----------------------------------------------------------------------------
+// token extraction
+// ----------------------------------------------------------------------------
+
+wxString wxStringTokenizer::GetNextToken()
+{
+    wxString token;
+    do
+    {
+        if ( !HasMoreTokens() )
+        {
+            break;
+        }
+
+        m_hasMoreTokens = MoreTokens_Unknown;
+
+        // find the end of this token
+        wxString::const_iterator pos =
+            find_first_of(m_delims, m_delimsLen, m_pos, m_stringEnd);
+
+        // and the start of the next one
+        if ( pos == m_stringEnd )
+        {
+            // no more delimiters, the token is everything till the end of
+            // string
+            token.assign(m_pos, m_stringEnd);
+
+            // skip the token
+            m_pos = m_stringEnd;
+
+            // it wasn't terminated
+            m_lastDelim = wxT('\0');
+        }
+        else // we found a delimiter at pos
+        {
+            // in wxTOKEN_RET_DELIMS mode we return the delimiter character
+            // with token, otherwise leave it out
+            wxString::const_iterator tokenEnd(pos);
+            if ( m_mode == wxTOKEN_RET_DELIMS )
+                ++tokenEnd;
+
+            token.assign(m_pos, tokenEnd);
+
+            // skip the token and the trailing delimiter
+            m_pos = pos + 1;
+
+            m_lastDelim = (pos == m_stringEnd) ? wxT('\0') : (wxChar)*pos;
+        }
+    }
+    while ( !AllowEmpty() && token.empty() );
+
+    return token;
 }
 
-wxString wxStringTokenizer::NextToken()
+// ----------------------------------------------------------------------------
+// public functions
+// ----------------------------------------------------------------------------
+
+wxArrayString wxStringTokenize(const wxString& str,
+                               const wxString& delims,
+                               wxStringTokenizerMode mode)
 {
-  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 = wxEmptyString;
-    
-    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;
+    wxArrayString tokens;
+    wxStringTokenizer tk(str, delims, mode);
+    while ( tk.HasMoreTokens() )
+    {
+        tokens.Add(tk.GetNextToken());
+    }
+
+    return tokens;
 }