X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e90c1d2a19361551eb07778280f22be3e759cf64..4b5d2be39657bb364c9111c4d13b1eecb8f3b69f:/src/common/textfile.cpp

diff --git a/src/common/textfile.cpp b/src/common/textfile.cpp
index 95dd05b357..79d837f631 100644
--- a/src/common/textfile.cpp
+++ b/src/common/textfile.cpp
@@ -1,330 +1,316 @@
 ///////////////////////////////////////////////////////////////////////////////
-// Name:        textfile.cpp
+// Name:        src/common/textfile.cpp
 // Purpose:     implementation of wxTextFile class
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     03.04.98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 // headers
 // ============================================================================
 
-#ifdef __GNUG__
-    #pragma implementation "textfile.h"
-#endif
-
 #include  "wx/wxprec.h"
 
 #ifdef    __BORLANDC__
     #pragma hdrstop
 #endif  //__BORLANDC__
 
-#if !wxUSE_FILE
+#if !wxUSE_FILE || !wxUSE_TEXTBUFFER
     #undef wxUSE_TEXTFILE
     #define wxUSE_TEXTFILE 0
 #endif // wxUSE_FILE
 
+#if wxUSE_TEXTFILE
+
 #ifndef WX_PRECOMP
-    #include  "wx/string.h"
-    #include  "wx/intl.h"
-    #include  "wx/file.h"
-    #include  "wx/log.h"
+    #include "wx/string.h"
+    #include "wx/intl.h"
+    #include "wx/file.h"
+    #include "wx/log.h"
 #endif
 
-#include  "wx/textfile.h"
+#include "wx/textfile.h"
+#include "wx/filename.h"
+#include "wx/buffer.h"
 
 // ============================================================================
 // wxTextFile class implementation
 // ============================================================================
 
+wxTextFile::wxTextFile(const wxString& strFileName)
+          : wxTextBuffer(strFileName)
+{
+}
+
+
 // ----------------------------------------------------------------------------
-// static methods (always compiled in)
+// file operations
 // ----------------------------------------------------------------------------
 
-// default type is the native one
-const wxTextFileType wxTextFile::typeDefault =
-#if   defined(__WINDOWS__)
-  wxTextFileType_Dos;
-#elif defined(__UNIX__)
-  wxTextFileType_Unix;
-#elif defined(__WXMAC__)
-  wxTextFileType_Mac;
-#elif defined(__WXPM__)
-  wxTextFileType_Os2;
-#else
-  wxTextFileType_None;
-  #error  "wxTextFile: unsupported platform."
-#endif
-
-const wxChar *wxTextFile::GetEOL(wxTextFileType type)
+bool wxTextFile::OnExists() const
 {
-    switch ( type ) {
-      default:
-        wxFAIL_MSG(T("bad file type in wxTextFile::GetEOL."));
-        // fall through nevertheless - we must return something...
-
-      case wxTextFileType_None: return T("");
-      case wxTextFileType_Unix: return T("\n");
-      case wxTextFileType_Dos:  return T("\r\n");
-      case wxTextFileType_Mac:  return T("\r");
-    }
+    return wxFile::Exists(m_strBufferName);
 }
 
 
-wxString wxTextFile::Translate(const wxString& text, wxTextFileType type)
+bool wxTextFile::OnOpen(const wxString &strBufferName, wxTextBufferOpenMode OpenMode)
 {
-    // don't do anything if there is nothing to do
-    if ( type == wxTextFileType_None )
-        return text;
-
-    wxString eol = GetEOL(type), result;
-
-    // optimization: we know that the length of the new string will be about
-    // the same as the length of the old one, so prealloc memory to aviod
-    // unnecessary relocations
-    result.Alloc(text.Len());
+    wxFile::OpenMode FileOpenMode;
 
-    wxChar chLast = 0;
-    for ( const wxChar *pc = text.c_str(); *pc; pc++ )
+    switch ( OpenMode )
     {
-        wxChar ch = *pc;
-        switch ( ch ) {
-            case '\n':
-                // Dos/Unix line termination
-                result += eol;
-                chLast = '\n';
-                break;
+        default:
+            wxFAIL_MSG( _T("unknown open mode in wxTextFile::Open") );
+            // fall through
 
-            case '\r':
-                if ( chLast == '\r' ) {
-                    // Mac empty line
-                    result += eol;
-                }
-                else
-                    chLast = '\r';
-                break;
+        case ReadAccess :
+            FileOpenMode = wxFile::read;
+            break;
 
-            default:
-                if ( chLast == '\r' ) {
-                    // Mac line termination
-                    result += eol;
-                    chLast = ch;
-                }
-                else {
-                    // add to the current line
-                    result += ch;
-                }
-        }
+        case WriteAccess :
+            FileOpenMode = wxFile::write;
+            break;
     }
 
-    return result;
+    return m_file.Open(strBufferName.c_str(), FileOpenMode);
 }
 
-#if wxUSE_TEXTFILE
 
-// ----------------------------------------------------------------------------
-// ctors & dtor
-// ----------------------------------------------------------------------------
-
-wxTextFile::wxTextFile(const wxString& strFile) : m_strFile(strFile)
+bool wxTextFile::OnClose()
 {
-  m_nCurLine = 0;
-  m_isOpened = FALSE;
+    return m_file.Close();
 }
 
-wxTextFile::~wxTextFile()
-{
-  // m_file dtor called automatically
-}
 
-// ----------------------------------------------------------------------------
-// file operations
-// ----------------------------------------------------------------------------
-
-bool wxTextFile::Open(const wxString& strFile)
+bool wxTextFile::OnRead(const wxMBConv& conv)
 {
-  m_strFile = strFile;
+    // file should be opened
+    wxASSERT_MSG( m_file.IsOpened(), _T("can't read closed file") );
+
+    // read the entire file in memory: this is not the most efficient thing to
+    // do it but there is no good way to avoid it in Unicode build because if
+    // we read the file block by block we can't convert each block to Unicode
+    // separately (the last multibyte char in the block might be only partially
+    // read and so the conversion would fail) and, as the file contents is kept
+    // in memory by wxTextFile anyhow, it shouldn't be a big problem to read
+    // the file entirely
+    size_t bufSize = 0;
+
+    // number of bytes to (try to) read from disk at once
+    static const size_t BLOCK_SIZE = 4096;
+
+    wxCharBuffer buf;
+
+    // first determine if the file is seekable or not and so whether we can
+    // determine its length in advance
+    wxFileOffset fileLength;
+    {
+        wxLogNull logNull;
+        fileLength = m_file.Length();
+    }
 
-  return Open();
-}
+    // some non-seekable files under /proc under Linux pretend that they're
+    // seekable but always return 0; others do return an error
+    const bool seekable = fileLength != wxInvalidOffset && fileLength != 0;
+    if ( seekable )
+    {
+        // we know the required length, so set the buffer size in advance
+        bufSize = fileLength;
+        if ( !buf.extend(bufSize) )
+            return false;
+
+        // if the file is seekable, also check that we're at its beginning
+        wxASSERT_MSG( m_file.Tell() == 0, _T("should be at start of file") );
+
+        char *dst = buf.data();
+        for ( size_t nRemaining = bufSize; nRemaining > 0; )
+        {
+            size_t nToRead = BLOCK_SIZE;
+
+            // the file size could have changed, avoid overflowing the buffer
+            // even if it did
+            if ( nToRead > nRemaining )
+                nToRead = nRemaining;
+
+            ssize_t nRead = m_file.Read(dst, nToRead);
+
+            if ( nRead == wxInvalidOffset )
+            {
+                // read error (error message already given in wxFile::Read)
+                return false;
+            }
+
+            if ( nRead == 0 )
+            {
+                // this file can't be empty because we checked for this above
+                // so this must be the end of file
+                break;
+            }
 
-bool wxTextFile::Open()
-{
-  // file name must be either given in ctor or in Open(const wxString&)
-  wxASSERT( !m_strFile.IsEmpty() );
+            dst += nRead;
+            nRemaining -= nRead;
+        }
 
-  // open file in read-only mode
-  if ( !m_file.Open(m_strFile) )
-    return FALSE;
+        wxASSERT_MSG( dst - buf.data() == (wxFileOffset)bufSize,
+                      _T("logic error") );
+    }
+    else // file is not seekable
+    {
+        char block[BLOCK_SIZE];
+        for ( ;; )
+        {
+            ssize_t nRead = m_file.Read(block, WXSIZEOF(block));
+
+            if ( nRead == wxInvalidOffset )
+            {
+                // read error (error message already given in wxFile::Read)
+                return false;
+            }
+
+            if ( nRead == 0 )
+            {
+                // if no bytes have been read, presumably this is a
+                // valid-but-empty file
+                if ( bufSize == 0 )
+                    return true;
+
+                // otherwise we've finished reading the file
+                break;
+            }
 
-  // read file into memory
-  m_isOpened = Read();
+            // extend the buffer for new data
+            if ( !buf.extend(bufSize + nRead) )
+                return false;
 
-  m_file.Close();
+            // and append it to the buffer
+            memcpy(buf.data() + bufSize, block, nRead);
+            bufSize += nRead;
+        }
+    }
 
-  return m_isOpened;
-}
+    const wxString str(buf, conv, bufSize);
 
-// analyse some lines of the file trying to guess it's type.
-// if it fails, it assumes the native type for our platform.
-wxTextFileType wxTextFile::GuessType() const
-{
-  // file should be opened and we must be in it's beginning
-  wxASSERT( m_file.IsOpened() && m_file.Tell() == 0 );
-
-  // scan the file lines
-  size_t nUnix = 0,     // number of '\n's alone
-       nDos  = 0,     // number of '\r\n'
-       nMac  = 0;     // number of '\r's
-
-  // we take MAX_LINES_SCAN in the beginning, middle and the end of file
-  #define MAX_LINES_SCAN    (10)
-  size_t nCount = m_aLines.Count() / 3,
-       nScan =  nCount > 3*MAX_LINES_SCAN ? MAX_LINES_SCAN : nCount / 3;
-
-  #define   AnalyseLine(n)              \
-    switch ( m_aTypes[n] ) {            \
-      case wxTextFileType_Unix: nUnix++; break;   \
-      case wxTextFileType_Dos:  nDos++;  break;   \
-      case wxTextFileType_Mac:  nMac++;  break;   \
-      default: wxFAIL_MSG(_("unknown line terminator")); \
+    // there's no risk of this happening in ANSI build
+#if wxUSE_UNICODE
+    if ( bufSize > 4 && str.empty() )
+    {
+        wxLogError(_("Failed to convert file \"%s\" to Unicode."), GetName());
+        return false;
     }
+#endif // wxUSE_UNICODE
 
-  size_t n;
-  for ( n = 0; n < nScan; n++ )     // the beginning
-    AnalyseLine(n);
-  for ( n = (nCount - nScan)/2; n < (nCount + nScan)/2; n++ )
-    AnalyseLine(n);
-  for ( n = nCount - nScan; n < nCount; n++ )
-    AnalyseLine(n);
-
-  #undef   AnalyseLine
-
-  // interpret the results (FIXME far from being even 50% fool proof)
-  if ( nDos + nUnix + nMac == 0 ) {
-    // no newlines at all
-    wxLogWarning(_("'%s' is probably a binary file."), m_strFile.c_str());
-  }
-  else {
-    #define   GREATER_OF(t1, t2) n##t1 == n##t2 ? typeDefault               \
-                                                : n##t1 > n##t2             \
-                                                    ? wxTextFileType_##t1   \
-                                                    : wxTextFileType_##t2
-
-    // Watcom C++ doesn't seem to be able to handle the macro
-#if !defined(__WATCOMC__)
-    if ( nDos > nUnix )
-      return GREATER_OF(Dos, Mac);
-    else if ( nDos < nUnix )
-      return GREATER_OF(Unix, Mac);
-    else {
-      // nDos == nUnix
-      return nMac > nDos ? wxTextFileType_Mac : typeDefault;
-    }
-#endif // __WATCOMC__
+    // we don't need this memory any more
+    buf.reset();
 
-    #undef    GREATER_OF
-  }
 
-  return typeDefault;
-}
+    // now break the buffer in lines
 
-bool wxTextFile::Read()
-{
-  // file should be opened and we must be in it's beginning
-  wxASSERT( m_file.IsOpened() && m_file.Tell() == 0 );
-
-  wxString str;
-  char ch, chLast = '\0';
-  char buf[1024];
-  int n, nRead;
-  while ( !m_file.Eof() ) {
-    nRead = m_file.Read(buf, WXSIZEOF(buf));
-    if ( nRead == wxInvalidOffset ) {
-      // read error (error message already given in wxFile::Read)
-      return FALSE;
-    }
+    // last processed character, we need to know if it was a CR or not
+    wxChar chLast = '\0';
+
+    // the beginning of the current line, changes inside the loop
+    wxString::const_iterator lineStart = str.begin();
+    const wxString::const_iterator end = str.end();
+    for ( wxString::const_iterator p = lineStart; p != end; p++ )
+    {
+        const wxChar ch = *p;
+        switch ( ch )
+        {
+            case '\n':
+                // could be a DOS or Unix EOL
+                if ( chLast == '\r' )
+                {
+                    if ( p - 1 >= lineStart )
+                    {
+                        AddLine(wxString(lineStart, p - 1), wxTextFileType_Dos);
+                    }
+                    else
+                    {
+                        // there were two line endings, so add an empty line:
+                        AddLine(wxEmptyString, wxTextFileType_Dos);
+                    }
+                }
+                else // bare '\n', Unix style
+                {
+                    AddLine(wxString(lineStart, p), wxTextFileType_Unix);
+                }
 
-    for ( n = 0; n < nRead; n++ ) {
-      ch = buf[n];
-      switch ( ch ) {
-        case '\n':
-          // Dos/Unix line termination
-          m_aLines.Add(str);
-          m_aTypes.Add(chLast == '\r' ? wxTextFileType_Dos
-                                      : wxTextFileType_Unix);
-          str.Empty();
-          chLast = '\n';
-          break;
-
-        case '\r':
-          if ( chLast == '\r' ) {
-            // Mac empty line
-            m_aLines.Add("");
-            m_aTypes.Add(wxTextFileType_Mac);
-          }
-          else
-            chLast = '\r';
-          break;
+                lineStart = p + 1;
+                break;
 
-        default:
-          if ( chLast == '\r' ) {
-            // Mac line termination
-            m_aLines.Add(str);
-            m_aTypes.Add(wxTextFileType_Mac);
-            chLast = ch;
-            str = ch;
-          }
-          else {
-            // add to the current line
-            str += ch;
-          }
-      }
+            case '\r':
+                if ( chLast == '\r' )
+                {
+                    // Mac empty line
+                    AddLine(wxEmptyString, wxTextFileType_Mac);
+                    lineStart = p + 1;
+                }
+                //else: we don't know what this is yet -- could be a Mac EOL or
+                //      start of DOS EOL so wait for next char
+                break;
+
+            default:
+                if ( chLast == '\r' )
+                {
+                    // Mac line termination
+                    if ( p - 1 >= lineStart )
+                    {
+                        AddLine(wxString(lineStart, p - 1), wxTextFileType_Mac);
+                    }
+                    else
+                    {
+                        // there were two line endings, so add an empty line:
+                        AddLine(wxEmptyString, wxTextFileType_Mac);
+                    }
+                    lineStart = p;
+                }
+        }
+
+        chLast = ch;
     }
-  }
 
-  // anything in the last line?
-  if ( !str.IsEmpty() ) {
-    m_aTypes.Add(wxTextFileType_None);  // no line terminator
-    m_aLines.Add(str);
-  }
+    // anything in the last line?
+    if ( lineStart != end )
+    {
+        // add unterminated last line
+        AddLine(wxString(lineStart, end), wxTextFileType_None);
+    }
 
-  return TRUE;
+    return true;
 }
 
-bool wxTextFile::Close()
+
+bool wxTextFile::OnWrite(wxTextFileType typeNew, const wxMBConv& conv)
 {
-    m_aTypes.Clear();
-    m_aLines.Clear();
-    m_nCurLine = 0;
-    m_isOpened = FALSE;
+    wxFileName fn = m_strBufferName;
 
-    return TRUE;
-}
+    // We do NOT want wxPATH_NORM_CASE here, or the case will not
+    // be preserved.
+    if ( !fn.IsAbsolute() )
+        fn.Normalize(wxPATH_NORM_ENV_VARS | wxPATH_NORM_DOTS | wxPATH_NORM_TILDE |
+                     wxPATH_NORM_ABSOLUTE | wxPATH_NORM_LONG);
 
-bool wxTextFile::Write(wxTextFileType typeNew)
-{
-  wxTempFile fileTmp(m_strFile);
-
-  if ( !fileTmp.IsOpened() ) {
-    wxLogError(_("can't write file '%s' to disk."), m_strFile.c_str());
-    return FALSE;
-  }
-
-  size_t nCount = m_aLines.Count();
-  for ( size_t n = 0; n < nCount; n++ ) {
-    fileTmp.Write(m_aLines[n] +
-                  GetEOL(typeNew == wxTextFileType_None ? m_aTypes[n]
-                                                        : typeNew));
-  }
-
-  // replace the old file with this one
-  return fileTmp.Commit();
+    wxTempFile fileTmp(fn.GetFullPath());
+
+    if ( !fileTmp.IsOpened() ) {
+        wxLogError(_("can't write buffer '%s' to disk."), m_strBufferName.c_str());
+        return false;
+    }
+
+    size_t nCount = GetLineCount();
+    for ( size_t n = 0; n < nCount; n++ ) {
+        fileTmp.Write(GetLine(n) +
+                      GetEOL(typeNew == wxTextFileType_None ? GetLineType(n)
+                                                            : typeNew),
+                      conv);
+    }
+
+    // replace the old file with this one
+    return fileTmp.Commit();
 }
 
 #endif // wxUSE_TEXTFILE
-