Method Peek

internal/utf8.cc:137–163

  bool HasRemaining() const { return size_ != 0; }

  absl::string_view Peek(size_t n) {
    ABSL_ASSERT(n <= Remaining());
    if (n == 0) {
      return absl::string_view();
    }
    if (n <= buffer_.size() - index_) {
      // Enough data remaining in temporary buffer.
      return absl::string_view(buffer_.data() + index_, n);
    }
    // We do not have enough data. See if we can fit it without allocating by
    // shifting data back to the beginning of the buffer.
    if (buffer_.capacity() >= n) {
      // It will fit in the current capacity, see if we need to shift the
      // existing data to make it fit.
      if (buffer_.capacity() - buffer_.size() < n && index_ != 0) {
        // We need to shift.
        buffer_.erase(buffer_.begin(), buffer_.begin() + index_);
        index_ = 0;
      }
    }
    // Ensure we never reserve less than kUtf8Max.
    buffer_.reserve(std::max(buffer_.size() + n, kUtf8Max));
    size_t to_copy = n - (buffer_.size() - index_);
    absl::CopyCordToString(input_.Subcord(0, to_copy), &buffer_);
    input_.RemovePrefix(to_copy);
    return absl::string_view(buffer_.data() + index_, n);
  }

  char Read() {
    char value = Peek(1).front();