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//
// CountingStream.h
//
// Library: Foundation
// Package: Streams
// Module: CountingStream
//
// Definition of the CountingStreamBuf, CountingInputStream and CountingOutputStream classes.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_CountingStream_INCLUDED
#define Foundation_CountingStream_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/UnbufferedStreamBuf.h"
#include <istream>
#include <ostream>
namespace Poco {
class Foundation_API CountingStreamBuf: public UnbufferedStreamBuf
/// This stream buffer counts all characters and lines
/// going through it.
{
public:
CountingStreamBuf();
/// Creates an unconnected CountingStreamBuf.
CountingStreamBuf(std::istream& istr);
/// Creates the CountingStreamBuf and connects it
/// to the given input stream.
CountingStreamBuf(std::ostream& ostr);
/// Creates the CountingStreamBuf and connects it
/// to the given output stream.
~CountingStreamBuf();
/// Destroys the CountingStream.
int chars() const;
/// Returns the total number of characters.
int lines() const;
/// Returns the total number of lines.
int pos() const;
/// Returns the number of characters on the current line.
void reset();
/// Resets all counters.
void setCurrentLineNumber(int line);
/// Sets the current line number.
///
/// This is mainly useful when parsing C/C++
/// preprocessed source code containing #line directives.
int getCurrentLineNumber() const;
/// Returns the current line number (same as lines()).
void addChars(int chars);
/// Add to the total number of characters.
void addLines(int lines);
/// Add to the total number of lines.
void addPos(int pos);
/// Add to the number of characters on the current line.
protected:
int readFromDevice();
int writeToDevice(char c);
private:
std::istream* _pIstr;
std::ostream* _pOstr;
int _chars;
int _lines;
int _pos;
};
class Foundation_API CountingIOS: public virtual std::ios
/// The base class for CountingInputStream and CountingOutputStream.
///
/// This class is needed to ensure the correct initialization
/// order of the stream buffer and base classes.
{
public:
CountingIOS();
/// Creates the basic stream and leaves it unconnected.
CountingIOS(std::istream& istr);
/// Creates the basic stream and connects it
/// to the given input stream.
CountingIOS(std::ostream& ostr);
/// Creates the basic stream and connects it
/// to the given output stream.
~CountingIOS();
/// Destroys the stream.
int chars() const;
/// Returns the total number of characters.
int lines() const;
/// Returns the total number of lines.
int pos() const;
/// Returns the number of characters on the current line.
void reset();
/// Resets all counters.
void setCurrentLineNumber(int line);
/// Sets the current line number.
///
/// This is mainly useful when parsing C/C++
/// preprocessed source code containing #line directives.
int getCurrentLineNumber() const;
/// Returns the current line number (same as lines()).
void addChars(int chars);
/// Add to the total number of characters.
void addLines(int lines);
/// Add to the total number of lines.
void addPos(int pos);
/// Add to the number of characters on the current line.
CountingStreamBuf* rdbuf();
/// Returns a pointer to the underlying streambuf.
protected:
CountingStreamBuf _buf;
};
class Foundation_API CountingInputStream: public CountingIOS, public std::istream
/// This stream counts all characters and lines
/// going through it. This is useful for lexers and parsers
/// that need to determine the current position in the stream.
{
public:
CountingInputStream(std::istream& istr);
/// Creates the CountingInputStream and connects it
/// to the given input stream.
~CountingInputStream();
/// Destroys the stream.
};
class Foundation_API CountingOutputStream: public CountingIOS, public std::ostream
/// This stream counts all characters and lines
/// going through it.
{
public:
CountingOutputStream();
/// Creates an unconnected CountingOutputStream.
CountingOutputStream(std::ostream& ostr);
/// Creates the CountingOutputStream and connects it
/// to the given output stream.
~CountingOutputStream();
/// Destroys the CountingOutputStream.
};
//
// inlines
//
inline int CountingStreamBuf::chars() const
{
return _chars;
}
inline int CountingStreamBuf::lines() const
{
return _lines;
}
inline int CountingStreamBuf::pos() const
{
return _pos;
}
inline int CountingStreamBuf::getCurrentLineNumber() const
{
return _lines;
}
inline int CountingIOS::chars() const
{
return _buf.chars();
}
inline int CountingIOS::lines() const
{
return _buf.lines();
}
inline int CountingIOS::pos() const
{
return _buf.pos();
}
inline int CountingIOS::getCurrentLineNumber() const
{
return _buf.getCurrentLineNumber();
}
} // namespace Poco
#endif // Foundation_CountingStream_INCLUDED
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