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 reference