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Overview
Comment:Lemon correctly recognizes an empty grammar and errors out. Fix for a bug reported on the sqlite-users mailing list. (CVS 3226)
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SHA1: 55392922686691db3d41525a7f4cb7f976e73467
User & Date: drh 2006-06-13 13:27:47.000
Context
2006-06-13
14:16
Add simple tests for the xFilter and xBestIndex methods. (CVS 3227) (check-in: 0f4657ea69 user: danielk1977 tags: trunk)
13:27
Lemon correctly recognizes an empty grammar and errors out. Fix for a bug reported on the sqlite-users mailing list. (CVS 3226) (check-in: 5539292268 user: drh tags: trunk)
11:27
Free error message string in the quick start example. (CVS 3225) (check-in: 1273261ba7 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to tool/lemon.c.
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     printf("Lemon version 1.0\n");
     exit(0); 
  }
  if( OptNArgs()!=1 ){
    fprintf(stderr,"Exactly one filename argument is required.\n");
    exit(1);
  }

  lem.errorcnt = 0;

  /* Initialize the machine */
  Strsafe_init();
  Symbol_init();
  State_init();
  lem.argv0 = argv[0];
  lem.filename = OptArg(0);
  lem.basisflag = basisflag;
  lem.has_fallback = 0;
  lem.nconflict = 0;
  lem.name = lem.include = lem.arg = lem.tokentype = lem.start = 0;
  lem.vartype = 0;
  lem.stacksize = 0;
  lem.error = lem.overflow = lem.failure = lem.accept = lem.tokendest =
     lem.tokenprefix = lem.outname = lem.extracode = 0;
  lem.vardest = 0;
  lem.tablesize = 0;
  Symbol_new("$");
  lem.errsym = Symbol_new("error");
  lem.wildcard = 0;

  /* Parse the input file */
  Parse(&lem);
  if( lem.errorcnt ) exit(lem.errorcnt);
  if( lem.rule==0 ){
    fprintf(stderr,"Empty grammar.\n");
    exit(1);
  }

  /* Count and index the symbols of the grammar */
  lem.nsymbol = Symbol_count();
  Symbol_new("{default}");








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     printf("Lemon version 1.0\n");
     exit(0); 
  }
  if( OptNArgs()!=1 ){
    fprintf(stderr,"Exactly one filename argument is required.\n");
    exit(1);
  }
  memset(&lem, 0, sizeof(lem));
  lem.errorcnt = 0;

  /* Initialize the machine */
  Strsafe_init();
  Symbol_init();
  State_init();
  lem.argv0 = argv[0];
  lem.filename = OptArg(0);
  lem.basisflag = basisflag;









  Symbol_new("$");
  lem.errsym = Symbol_new("error");


  /* Parse the input file */
  Parse(&lem);
  if( lem.errorcnt ) exit(lem.errorcnt);
  if( lem.nrule==0 ){
    fprintf(stderr,"Empty grammar.\n");
    exit(1);
  }

  /* Count and index the symbols of the grammar */
  lem.nsymbol = Symbol_count();
  Symbol_new("{default}");
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