You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
1.9 KiB
83 lines
1.9 KiB
//========================================================================
|
|
//
|
|
// 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 *xrefA, Stream *str);
|
|
|
|
// Construct a lexer for a stream or array of streams (assumes obj
|
|
// is either a stream or array of streams).
|
|
Lexer(XRef *xrefA, Object *obj);
|
|
|
|
// Destructor.
|
|
~Lexer();
|
|
|
|
// Get the next object from the input stream.
|
|
Object *getObj(Object *obj, int objNum = -1);
|
|
|
|
// 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); }
|
|
|
|
// Returns true if <c> is a whitespace character.
|
|
static GBool isSpace(int c);
|
|
|
|
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
|
|
|
|
XRef *xref;
|
|
};
|
|
|
|
#endif
|