Assertive check functions for defensive R programming.
goalie is an attempt to incorporate elements of multiple assertive check packages into a single package with as few dependencies as possible. All assertive checks are written in the most basic R code possible, without reliance on compilation (e.g. C++/Rcpp). It is still a work in progress, and feature requests are welcome.
R exports the
stopifnot() function as a simple assert engine that supports multiple boolean returns (
FALSE) in a single call, separated by commas. This is a nice, flexible system for defensive programming. However,
stopifnot() does not currently support custom error messages, and can be confusing to debug.
Similar to the approach used in the assertthat package, goalie exports the
assert() function, which is designed to be a drop-in replacement for
stopifnot() with improved error message support.
validate() is a variation on
assert() that is intended to be used within S4 class validity checks, which is useful for Bioconductor packages.
Additionally, goalie exports a number of assertive check functions that are intended to harden bioinformatics-oriented functions in R. These check functions return
logical with an additional
"goalie" S4 class definition, which enables us to keep track of additional useful information about the cause of the error (see
cause() for details). This approach draws heavily from the assertive package.