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Helpers for stripping expressions of covr-inserted trace code

Source: R/helpers_covr.R
h_covr_helpers.Rd

Workarounds to allow the package to continue to work while running covr with minimal changes to the package code.

Usage 

h_covr_active()

h_covr_detrace(expr)

h_is_covr_trace(expr)

h_covr_detrace_call(expr)

Arguments

expr

(language)
an R expression or call to test or strip of covr trace counters.

Value

A logical value or transformed expression with calls to covr:::count removed.

Details

When using covr, the source code for package objects are modified to add callbacks for each expression to log its execution. Given an arbitrary expression, such as:

expr

The code will be modified before executing any package code to look like:

if (TRUE) {
  covr:::count("file.R:1:2:3:4:5:6:7:8")
  expr
}

These functions are used for stripping expressions of this code so that the package continues to work as intended while running tests as part of running covr to calculate package coverage.

This method is non-exhaustive, covering only a subset of covr's tracing behaviors necessary for this package.

Functions

  • h_covr_active(): Determine whether covr is currently running

  • h_covr_detrace(): Remove covr traces from an expression

  • h_is_covr_trace(): Determine whether the current expression is a covr-modified expression

  • h_covr_detrace_call(): Extract the original expression from a covr-modified expression