program = statement, {statement} block = "{",{statement}, "}" statement = short_statement | while_block | if_block short_statement = declaration | assignement | expression | inc-dec, ";" assignement = name, assignement_symbol, expression declaration = "var" , name , {",",name}, ";" expression = compar compar = calcul, [compar_op, calcul] calcul = terme, [('+'|'-'), terme] terme = factor [("*"|"/"), factor] factor = val ["**", val] val = name | number | "(", expression, ")" inc-dec = name, ("++" | "--") condition = '(', expression, ')' while_block = "while", condition, block if_block = "if", condition, block, ["else", block] bin_op = "+"|"-"|"*"|"/"|"**" compar_op = ">"|">="|"<"|"<="|"==" assignement_symbol = "="|"+="|"-="|"/="|"*="