forked from KolibriOS/kolibrios
110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
/** \file lispio.h
|
|
* definitions of pure input output classes.
|
|
*/
|
|
|
|
|
|
#ifndef __lispio_h__
|
|
#define __lispio_h__
|
|
|
|
#include "yacasbase.h"
|
|
|
|
// Hope this forward declaration doesn't screw us over...
|
|
class InputDirectories;
|
|
class InputStatus : public YacasBase
|
|
{
|
|
public:
|
|
InputStatus() : iFileName("none") , iLineNumber(-1) {};
|
|
~InputStatus();
|
|
void SetTo(LispChar * aFileName);
|
|
void RestoreFrom(InputStatus& aPreviousStatus);
|
|
inline LispInt LineNumber();
|
|
inline LispChar * FileName();
|
|
inline void NextLine();
|
|
|
|
inline InputStatus(const InputStatus& aOther) : iFileName(aOther.iFileName) , iLineNumber(aOther.iLineNumber)
|
|
{
|
|
}
|
|
|
|
inline InputStatus& operator=(const InputStatus& aOther)
|
|
{
|
|
iFileName = aOther.iFileName;
|
|
iLineNumber = aOther.iLineNumber;
|
|
return *this;
|
|
}
|
|
|
|
private:
|
|
LispChar * iFileName;
|
|
LispInt iLineNumber;
|
|
};
|
|
|
|
inline LispInt InputStatus::LineNumber()
|
|
{
|
|
return iLineNumber;
|
|
}
|
|
inline LispChar * InputStatus::FileName()
|
|
{
|
|
return iFileName;
|
|
}
|
|
inline void InputStatus::NextLine()
|
|
{
|
|
iLineNumber++;
|
|
}
|
|
|
|
/** \class LispInput : pure abstract class declaring the interface
|
|
* that needs to be implemented by a file (something that expressions
|
|
* can be read from).
|
|
*/
|
|
class LispInput : public YacasBase
|
|
{
|
|
public:
|
|
/** Constructor with InputStatus. InputStatus retains the information
|
|
* needed when an error occurred, and the file has already been
|
|
* closed.
|
|
*/
|
|
LispInput(InputStatus& aStatus) : iStatus(aStatus) {};
|
|
virtual ~LispInput();
|
|
|
|
/// Return the next character in the file
|
|
virtual LispChar Next() = 0;
|
|
|
|
/** Peek at the next character in the file, without advancing the file
|
|
* pointer.
|
|
*/
|
|
virtual LispChar Peek() = 0;
|
|
|
|
virtual InputStatus& Status() const {return iStatus;};
|
|
|
|
/// Check if the file position is past the end of the file.
|
|
virtual LispBoolean EndOfStream() = 0;
|
|
/** StartPtr returns the start of a buffer, if there is one.
|
|
* Implementations of this class can keep the file in memory
|
|
* as a whole, and return the start pointer and current position.
|
|
* Especially the parsing code requires this, because it can then
|
|
* efficiently look up a symbol in the hash table without having to
|
|
* first create a buffer to hold the symbol in. If StartPtr is supported,
|
|
* the whole file should be in memory for the whole period the file
|
|
* is being read.
|
|
*/
|
|
virtual LispChar * StartPtr() = 0;
|
|
virtual LispInt Position() = 0;
|
|
virtual void SetPosition(LispInt aPosition) = 0;
|
|
protected:
|
|
InputStatus& iStatus;
|
|
};
|
|
|
|
/** \class LispOutput : interface an output object should adhere to.
|
|
*/
|
|
class LispOutput : public YacasBase
|
|
{
|
|
public:
|
|
virtual ~LispOutput();
|
|
/// Write out one character.
|
|
virtual void PutChar(LispChar aChar) = 0;
|
|
|
|
public:
|
|
void Write(const LispChar * aString);
|
|
};
|
|
|
|
#endif
|
|
|