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Rebooting to support parsing of spreadsheet formulas and cell references as they appear in unevaluated expressions. This work is still in progress but a CRAN update is required now to update a test for testthat v1.0.x.
Package is beginning to implement classes and methods related to cell location and reference from ‘Spreadsheet Implementation Technology’ by Peter Sestoft, MIT Press, 2014.
New classes:
cell_addr: one or more absolute cell addressesra_ref: single absolute, relative, or mixed cell
referenceThe two components of a cell_limits object now
correspond NOT to row and column limits, but rather to the upper left
and lower right cells of the rectangle. See #6. It was too confusing to
have different conventions for the object and its print method.
If the maximum row or column is specified, but the minimum is
not, then we automatically set the associated minimum to 1, instead of
leaving as NA.
The header argument of anchored() has
been renamed to col_names, for greater consistency with readr, readxl, and googlesheets.
Added a NULL method for as.cell_limits
generic so that as.cell_limits(NULL) returns default,
degenerate cell limits, i.e. the min and max for rows and columns are
uniformly NA.
A cell_limits object now inherits from
“list”.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.