pagination_algo {formatters}

Pagination

Description

Pagination

Pagination Algorithm

Pagination is performed independently in the vertical and horizontal directions based solely on a pagination data frame, which includes the following information for each row/column:

• Number of lines/characters rendering the row will take after word-wrapping (self_extent)

• The indices (reprint_inds) and number of lines (par_extent) of the rows which act as context for the row

• The row's number of siblings and position within its siblings

Given lpp (cpp) is already adjusted for rendered elements which are not rows/columns and a data frame of pagination information, pagination is performed via the following algorithm with start = 1.

Core Pagination Algorithm:

1. Initial guess for pagination position is start + lpp (start + cpp)

2. While the guess is not a valid pagination position, and guess > start, decrement guess and repeat.

   • An error is thrown if all possible pagination positions between start and start + lpp (start + cpp) would be ⁠< start⁠ after decrementing

3. Retain pagination index

4. If pagination point was less than NROW(tt) (ncol(tt)), set start to pos + 1, and repeat steps (1) - (4).

Validating Pagination Position:

Given an (already adjusted) lpp or cpp value, a pagination is invalid if:

• The rows/columns on the page would take more than (adjusted) lpp lines/cpp characters to render including:

  • word-wrapping

  • (vertical only) context repetition

• (vertical only) footnote messages and/or section divider lines take up too many lines after rendering rows

• (vertical only) row is a label or content (row-group summary) row

• (vertical only) row at the pagination point has siblings, and it has less than min_siblings preceding or following siblings

• pagination would occur within a sub-table listed in nosplitin