errormessage.h

用于词法分析的词法分析器

/*
  $Id: ErrorMessage.h,v 1.7 1997/04/02 12:26:49 matt Exp $
  
  Error/warning messages.
  
  (c) 1996 Matt Phillips.
  */

#ifndef _ERRMSG_H
#define _ERRMSG_H

#include <std/string.h>

#include <contain/LinkedListWithTail.h>

// An error or warning message.
class ErrorMessage
{
public:

  enum Type {Error, Warning};

  // Construct a message.
  ErrorMessage (const string &msg, const string &f, int l, int c,
		Type t = Error)
    : message (msg), filename (f), line (l), column (c),
      messageType (t) {}

  
  // Construct a message using a char *.
  ErrorMessage (const char *msg, const char *f, int l, int c,
		Type t = Error)
    : message (msg), filename (f), line (l), column (c),
      messageType (t) {}

  string message, filename;
  int line, column;
  Type messageType;
};

// A list of error/warning messages.
class ErrorMessageList : public TypeIOLinkedListWithTail(ErrorMessage)
{
public:
   
  ErrorMessageList () {numErrors = numWarnings = 0;}

  virtual const char *name () const {return "Errors";}

  // Add a error message.
  void error (const string &msg, const string &file, int line, int column);

  // Add a warning message.
  void warning (const string &msg, const string &file, int line, int column);

  // Clear all messages.
  void clear ();

  // Return the number of error messages.
  int nErrors () const {return numErrors;}
  // Return the number of warning messages.
  int nWarnings () const {return numWarnings;}

  // Merge this message list with <list> (this list is cleared).
  void mergeWith (ErrorMessageList &list);

protected:

  int numErrors, numWarnings;
};

// Writes a formatted ErrorMessage to <s>.
ostream &operator << (ostream &s, const ErrorMessage &e);

#endif