regexpcompiler.h

用于词法分析的词法分析器

/*
  $Id: RegexpCompiler.h,v 1.5 1997/02/02 01:31:05 matt Exp $

  Regular expression compiler class.
  
  (c) Apr 95 Matt Phillips.
  */

#ifndef _RECOMP_H
#define _RECOMP_H

#include <std/string.h>
#include <contain/OrderedBinaryTree.h>
#include <util/checks.h>
#include <compiler/ErrorMessage.h>
#include <compiler/BufferedInputStream.h>
#include <fsm/Fsm.h>

#include "RegexpScanner.h"

class RegexpCompiler
{
public:

  typedef TypeIOOrderedBinaryTree(string, Fsm) Symbols;

  RegexpCompiler (BufferedInputStream &input,
		  int prod,
		  Symbols &syms);
   
  Fsm &getFsm () {return fsm;}
   
  int getLine () const {return scanner.getLine ();}
  int getCol () const {return scanner.getColumn ();}

  int nErrors () const {return errorList.nErrors ();}
  int nWarnings () const {return errorList.nWarnings ();}

  ErrorMessageList &getErrors () {return errorList;}

protected:
   
  FsmState &getRegexp (FsmState &start);
  FsmState &getOrTerm (FsmState &start);
  FsmState &getTerm (FsmState &start);
  FsmState &getFactor (FsmState &start);
  FsmState &getCIStr (FsmState &start);
  FsmState &getSet (FsmState &start);
  FsmState &getVariable (FsmState &start);
   
  FsmState &createRange (FsmState &start, UCharRange r);
  UCharRange readRange ();
   
  void mustbe (int sym);
  int have (int sym);
  void mustbeErr (int sym);
  void error (const char *msg);
  void warning (const char *msg);
   
  static UCharRange DotRange;
  Fsm fsm;
  ErrorMessageList errorList;
  RegexpScanner scanner;
  Symbols &symbols;
};

#endif