elexcompiler.h

用于词法分析的词法分析器

/*
  $Id: ElexCompiler.h,v 1.6 1997/05/18 10:58:07 matt Exp $

  Elex compiler class.

  (c) 1996 Matt Phillips.
  */

#ifndef _ELEXCOMP_H
#define _ELEXCOMP_H

#include <std/string.h>

#include <compiler/ErrorMessage.h>
#include <util/checks.h>
#include <regexp/RegexpCompiler.h>

#include "ElexScanner.h"
#include "ElexScannerDef.h"

class ElexCompiler
{
public:
   
  // constructor
  ElexCompiler (BufferedInputStream &i, ostream &co = cout);

  int nErrors () const {return errors.nErrors ();}
  int nWarnings () const {return errors.nWarnings ();}
   
  ErrorMessageList &getErrors () {return errors;}

  ElexScannerDef &getScannerDef () {return scannerDef;}

protected:

  ostream &codeOut;
  ErrorMessageList errors;
  ElexScanner scanner;
  ElexScannerDef scannerDef;
  RegexpCompiler::Symbols symbols;

  // errors
  void error (const char *msg);
  void warning (const char *msg);

  // parser subs
  void parseSymbols ();
  void parseDefines ();
  void parseDeclarations ();
  Fsm *parseRegexp ();
  void parseCodeFrags ();
  void outputCodeFrag ();
  void parseProduction ();
  void parseRegexProduction (const string &prodName);
  void parseProductions ();
  void parseScannerDef ();

  // error handling
  int mustbe (int sym);
  void mustbeError (int sym);
  int have (int sym);
};

#endif