wxWidgets/include/wx/textbuf.h

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///////////////////////////////////////////////////////////////////////////////
// Name: wx/textbuf.h
// Purpose: class wxTextBuffer to work with text buffers of _small_ size
// (buffer is fully loaded in memory) and which understands CR/LF
// differences between platforms.
// Created: 14.11.01
// Author: Morten Hanssen, Vadim Zeitlin
// Copyright: (c) 1998-2001 wxWindows team
// Licence: wxWindows license
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_TEXTBUFFER_H
#define _WX_TEXTBUFFER_H
#ifdef __GNUG__
#pragma interface "textbuf.h"
#endif
#include "wx/defs.h"
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
// the line termination type (kept wxTextFileType name for compability)
enum wxTextFileType
{
wxTextFileType_None, // incomplete (the last line of the file only)
wxTextFileType_Unix, // line is terminated with 'LF' = 0xA = 10 = '\n'
wxTextFileType_Dos, // 'CR' 'LF'
wxTextFileType_Mac, // 'CR' = 0xD = 13 = '\r'
wxTextFileType_Os2 // 'CR' 'LF'
};
#include "wx/string.h"
#if wxUSE_TEXTBUFFER
#include "wx/dynarray.h"
// ----------------------------------------------------------------------------
// wxTextBuffer
// ----------------------------------------------------------------------------
WX_DEFINE_EXPORTED_ARRAY(wxTextFileType, ArrayFileType);
#endif // wxUSE_TEXTBUFFER
class WXDLLEXPORT wxTextBuffer
{
public:
// constants and static functions
// default type for current platform (determined at compile time)
static const wxTextFileType typeDefault;
// this function returns a string which is identical to "text" passed in
// except that the line terminator characters are changed to correspond the
// given type. Called with the default argument, the function translates
// the string to the native format (Unix for Unix, DOS for Windows, ...).
static wxString Translate(const wxString& text,
wxTextFileType type = typeDefault);
// get the buffer termination string
static const wxChar *GetEOL(wxTextFileType type = typeDefault);
// the static methods of this class are compiled in even when
// !wxUSE_TEXTBUFFER because they are used by the library itself, but the
// rest can be left out
#if wxUSE_TEXTBUFFER
// buffer operations
// -----------------
// buffer exists?
bool Exists() const;
// create the buffer if it doesn't already exist
bool Create();
// same as Create() but with (another) buffer name
bool Create(const wxString& strBufferName);
// Open() also loads buffer in memory on success
bool Open(wxMBConv& conv = wxConvLibc);
// same as Open() but with (another) buffer name
bool Open(const wxString& strBufferName, wxMBConv& conv = wxConvLibc);
// closes the buffer and frees memory, losing all changes
bool Close();
// is buffer currently opened?
bool IsOpened() const { return m_isOpened; }
// accessors
// ---------
// get the number of lines in the buffer
size_t GetLineCount() const { return m_aLines.Count(); }
// the returned line may be modified (but don't add CR/LF at the end!)
wxString& GetLine(size_t n) const { return m_aLines[n]; }
wxString& operator[](size_t n) const { return m_aLines[n]; }
// the current line has meaning only when you're using
// GetFirstLine()/GetNextLine() functions, it doesn't get updated when
// you're using "direct access" i.e. GetLine()
size_t GetCurrentLine() const { return m_nCurLine; }
void GoToLine(size_t n) { m_nCurLine = n; }
bool Eof() const { return (m_aLines.Count() == 0 || m_nCurLine == m_aLines.Count() - 1); }
// these methods allow more "iterator-like" traversal of the list of
// lines, i.e. you may write something like:
// for ( str = GetFirstLine(); !Eof(); str = GetNextLine() ) { ... }
// NB: const is commented out because not all compilers understand
// 'mutable' keyword yet (m_nCurLine should be mutable)
wxString& GetFirstLine() /* const */ { return m_aLines[m_nCurLine = 0]; }
wxString& GetNextLine() /* const */ { return m_aLines[++m_nCurLine]; }
wxString& GetPrevLine() /* const */
{ wxASSERT(m_nCurLine > 0); return m_aLines[--m_nCurLine]; }
wxString& GetLastLine() /* const */
{ return m_aLines[m_nCurLine = m_aLines.Count() - 1]; }
// get the type of the line (see also GetEOL)
wxTextFileType GetLineType(size_t n) const { return m_aTypes[n]; }
// guess the type of buffer
wxTextFileType GuessType() const;
// get the name of the buffer
const wxChar *GetName() const { return m_strBufferName.c_str(); }
// add/remove lines
// ----------------
// add a line to the end
void AddLine(const wxString& str, wxTextFileType type = typeDefault)
{ m_aLines.Add(str); m_aTypes.Add(type); }
// insert a line before the line number n
void InsertLine(const wxString& str,
size_t n,
wxTextFileType type = typeDefault)
{ m_aLines.Insert(str, n); m_aTypes.Insert(type, n); }
// delete one line
void RemoveLine(size_t n) { m_aLines.RemoveAt(n); m_aTypes.RemoveAt(n); }
// change the buffer (default argument means "don't change type")
// possibly in another format
bool Write(wxTextFileType typeNew = wxTextFileType_None,
wxMBConv& conv = wxConvLibc);
// dtor
virtual ~wxTextBuffer();
protected:
// ctors
// -----
// default ctor, use Open(string)
wxTextBuffer() { }
// ctor from filename
wxTextBuffer(const wxString& strBufferName);
enum wxTextBufferOpenMode { ReadAccess, WriteAccess };
// Must implement these in derived classes.
virtual bool OnExists() const = 0;
virtual bool OnOpen(const wxString &strBufferName,
wxTextBufferOpenMode openmode) = 0;
virtual bool OnClose() = 0;
virtual bool OnRead(wxMBConv& conv) = 0;
virtual bool OnWrite(wxTextFileType typeNew,
wxMBConv& conv = wxConvLibc) = 0;
wxString m_strBufferName; // name of the buffer
private:
ArrayFileType m_aTypes; // type of each line
wxArrayString m_aLines; // lines of file
size_t m_nCurLine; // number of current line in the buffer
bool m_isOpened; // was the buffer successfully opened the last time?
#endif // wxUSE_TEXTBUFFER
// copy ctor/assignment operator not implemented
wxTextBuffer(const wxTextBuffer&);
wxTextBuffer& operator=(const wxTextBuffer&);
};
#endif // _WX_TEXTBUFFER_H