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tools/SFlexLexer.h

Go to the documentation of this file.

/* #start# ***********************************************************

                             Scheduling Simulator
                    Lehrstuhl f"ur Effiziente Algorithmen
                       Technische Universit"at M"unchen

 File    : $Id: SFlexLexer.h,v 1.2 2002/11/07 12:05:23 taeubig Exp $

 Purpose : SFlexLexer capsulates one lexical analyzer, which all modifiers 
           can use to load() from file. The logical analyzer is defined by 
           'lexan.l', the input file for flex (Fast Lexical Analyzer 
           Generator). There is only one instance of SFlexLexer for all 
           modifiers SFooMod. With SFooMod::getLexer()  the modifiers 
           can get full access to the underlying lexer. The lexer returns
           tokens for parsing the content of a file.

 RCS-Log:
 $Log: SFlexLexer.h,v $
 Revision 1.2  2002/11/07 12:05:23  taeubig
 Added standard namespace (std::)

 Revision 1.1  2002/08/29 12:59:59  taeubig
 Added the sources

 Revision 1.13  2000/05/24 12:53:42  taeubig
 New compiler (gcc-2.95) and new Qt (2.1)
 Replaced "list" by "leda_list" etc.

 Revision 1.12  2000/01/12 11:31:31  zoidl
 added javadoc comments and cosmetic changes in getDescription

 Revision 1.11  2000/01/11 17:26:17  zoidl
 added javadoc comments

 Revision 1.10  1999/12/02 00:22:10  zoidl
 added readIdentifier() and readToken() to simplify loading

 Revision 1.9  1999/11/23 19:49:58  zoidl
 added support for round brackets and semicolon

 Revision 1.8  1999/11/10 15:06:52  zoidl
 added parseLong()

 Revision 1.7  1999/11/08 00:23:31  zoidl
 workaround: lex doesn't reset line number on switch_stream, do it myself
 now

 Revision 1.6  1999/11/05 14:24:14  zoidl
 even more flexibility in loading double values

 Revision 1.5  1999/11/04 22:19:36  zoidl
 loading jobs more flexible

 Revision 1.4  1999/10/29 11:17:05  schickin
 example for new SFlexLexer-design added

 Revision 1.3  1999/10/14 14:32:42  zoidl
 nc

 Revision 1.2  1999/10/06 13:42:09  zoidl
 changed error handling

 Revision 1.1  1999/09/28 16:50:57  zoidl
 lexical analyzer for future load-routines added


 * #end# ************************************************************* */

#ifndef SFLEXLEXER_H
#define SFLEXLEXER_H

#include <FlexLexer.h>
#include <LEDA/string.h>

// defined them globally because lexan.l must access them, too
enum SFlexLexerToken {QUOTES=100, EQUAL, CRVDBRKT_OPEN, CRVDBRKT_CLOSE,
                      SQRBRKT_OPEN, SQRBRKT_CLOSE, RNDBRKT_OPEN,
                      RNDBRKT_CLOSE, COLON, SEMICOLON, COMMA, ULONG, 
                      DOUBLE, LONG, BOOL, STRING, IDENTIFIER, UNKNOWN};

//  had to define it, because flex seems not to able to set the line number
//  to 1, if the input-stream is switched (perhaps a bug in flex ?)
extern int _myLineNo; // defined in lexan.h


class SFlexLexer : public yyFlexLexer
{
 public:
  SFlexLexer(std::istream *in);

  ~SFlexLexer();

  void errMsg(const char* msg);
  
  SFlexLexerToken getToken();

  virtual int lineno() const
    { return _myLineNo; };

  void ungetToken()
    { _unGet = true; };
  
  bool parseDouble();
  
  bool parseLong();
  
  void setErrorCaption(char* cap)
    { _caption = leda_string(cap); };

  bool readIdentifier(const char* ident);

  bool readToken(const SFlexLexerToken token);

 private:
  SFlexLexerToken _currTok;
  // if true, next time the current token will be returned
  bool _unGet;
  FlexLexer* _pLex;
  leda_string _caption;
};

#endif

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