Method Balance

parser/parser.cc:579–584

}

Expr ExpressionBalancer::Balance() {
  if (terms_.size() == 1) {
    return std::move(terms_[0]);
  }
  return BalancedTree(0, ops_.size() - 1);
}

Expr ExpressionBalancer::BalancedTree(int lo, int hi) {
  int mid = (lo + hi + 1) / 2;