dynamicscanner.h

用于词法分析的词法分析器

/* $Id: DynamicScanner.h,v 1.3 1997/02/02 01:31:03 matt Exp $

   Elex dynamic scanner class.

   (c) Matt Phillips 1996. */

#ifndef _DYNAMIC_SCANNER
#define _DYNAMIC_SCANNER

#include <foo/FooObject.h>
#include <cppscan/ElexScanner.h>

class DynamicScanner : public ElexScanner
{
public:

  enum {MySymERROR = -100};

  // scandef should be a Foo scanner definition generated by elexc.
  DynamicScanner (const FooObject &scandef, XInputStream &i);
  ~DynamicScanner ();

  // returns the name of the current production.
  const string &getProduction () const {return production;}

protected:

  ElexScannerData scannerData;
  ElexState *states;
  int nStates;
  string *prodNames;		// maps a state ID to a production name.
  string production;		// the last matched production.

  void generate (const FooObject &scandef);
  ElexEdge *generateEdges (const FooObject::Objects &fooedges, 
			   ElexState *states) const;

  virtual int invokeProduction (int i);
};

#endif