package edu.gac.max.mcs388.s2002.c0;

import java_cup.runtime.Symbol;

%%

%{
  Symbol makeToken(int id, Object val){
    // yychar and yychar+yylength() are the positions of left and right ends
    return new Symbol(id, yychar, yychar + yylength(), val);
  }

  Symbol makeToken(int id){  // as above but with no attribute value
    return new Symbol(id, yychar, yychar + yylength());
  }
%}

%char

%type Symbol

%eofval{
  return makeToken(sym.EOF);
%eofval}

%%

"/"     {return makeToken(sym.DIVIDE);}
[0-9]+  {return makeToken(sym.NUMBER,
                          new Integer(Integer.parseInt(yytext())));}
"-"     {return makeToken(sym.MINUS);}
"*"     {return makeToken(sym.TIMES);}
"("     {return makeToken(sym.LPAREN);}
")"     {return makeToken(sym.RPAREN);}
"%"     {return makeToken(sym.MOD);}
"+"     {return makeToken(sym.PLUS);}
" "|\n|\t      {}
.     {return makeToken(sym.ILLEGAL_CHAR, yytext());}