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//========================================================================
//
// Lexer.h
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
#ifndef LEXER_H
#define LEXER_H
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "Object.h"
#include "Stream.h"
class XRef;
#define tokBufSize 128 // size of token buffer
//------------------------------------------------------------------------
// Lexer
//------------------------------------------------------------------------
class Lexer {
public:
// Construct a lexer for a single stream. Deletes the stream when
// lexer is deleted.
Lexer(XRef *xref, Stream *str);
// Construct a lexer for a stream or array of streams (assumes obj
// is either a stream or array of streams).
Lexer(XRef *xref, Object *obj);
// Destructor.
~Lexer();
// Get the next object from the input stream.
Object *getObj(Object *obj);
// Skip to the beginning of the next line in the input stream.
void skipToNextLine();
// Skip over one character.
void skipChar() { getChar(); }
// Get stream.
Stream *getStream()
{ return curStr.isNone() ? (Stream *)NULL : curStr.getStream(); }
// Get current position in file. This is only used for error
// messages, so it returns an int instead of a Guint.
int getPos()
{ return curStr.isNone() ? -1 : (int)curStr.streamGetPos(); }
// Set position in file.
void setPos(Guint pos, int dir = 0)
{ if (!curStr.isNone()) curStr.streamSetPos(pos, dir); }
private:
int getChar();
int lookChar();
Array *streams; // array of input streams
int strPtr; // index of current stream
Object curStr; // current stream
GBool freeArray; // should lexer free the streams array?
char tokBuf[tokBufSize]; // temporary token buffer
};
#endif
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