%option noyywrap
%{
/* * * * * * * * * * * *
 * * * DEFINITIONS * * *
 * * * * * * * * * * * */
%}

%x error
%x label

%%

%{
/* * * * * * * * * 
 * * * RULES * * *
 * * * * * * * * */
%}

[1-9][0-9]* {
	printf(" NUMBER: %s \n", yytext); 
	}

[ \t\n\f\r]	;		 // ignore white space 

direction	{ printf("direction\n");  }
vertical	{ printf("vertical\n");   }
horizontal      { printf("horizontal\n");   }
color { printf("color\n");   }
shape { printf("shape\n");   }
fontname { printf("fontname\n");   }
fontsize { printf("fontsize\n");   }
nodestyle { printf("nodestyle\n");   }
edgestyle { printf("edgestyle\n");   }
"="  { printf("=\n");   }
","  { printf(",\n");   }
";"  { printf(";\n");   }
"["  { printf("[\n");   }
"]"  { printf("]\n");   }
"->"  { printf("->\n");   }
\" { printf("%s\n", yytext); BEGIN(label); }
<label>[^\"] { yymore(); }
<label>\" { /* yytext ends with a " so we need to remove it by replacing it
		with the null character */
            yytext[yyleng-1]='\0';

	    /* print both the LABEL and " tokens */
            printf("LABEL: %s\n", yytext); 
            printf("\"\n");
            BEGIN(INITIAL); 
          }
[a-zA-Z][a-zA-Z0-9_]*	{ printf("NAME: %s\n", yytext);  }

. { BEGIN(error); yymore(); }
<error>[^1-9=,;\[\]\-\"a-zA-Z \t\n\f\r] { yymore(); }
<error>. { yyless(yyleng-1); printf("error token: %s\n", yytext); BEGIN(INITIAL); }

%%

/* * * * * * * * * * * 
 * * * USER CODE * * *
 * * * * * * * * * * *
 */
int main(int argc, char *argv[]) {
  yylex();
}