code: function processOperators (ops) {
      if (!ops) return {};
      var operators = {};
      for (var i=0,k,prec;prec=ops[i]; i++) {
          for (k=1;k < prec.length;k++) {
              operators[prec[k]] = {precedence: i+1, assoc: prec[0]};
          }
      }
      return operators;
  }
docs: set precedence and associativity of operators