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Improve consistency of naming internal functions #6072

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@teunbrand teunbrand commented Sep 3, 2024

This PR aims to fix #6024.

Briefly, it enforces some consistency on the various check_*() and validate_*() functions in ggplot2's unexported functions.

Check functions:

  • Check input verbatim
  • Their purpose is to throw conditions when input is unexpected
  • Return nothing (that is, invisible(NULL))

Validator functions:

  • Can take different variants of input
  • Their purpose is to converge output from input
  • Return a single type of output

In addition, a smaller category are functions that take possibly deprecated values and restore it to valid values. I've named these update_*() functions here, but that might be confusing and perhaps we could choose a better name.

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Naming of internal helper functions
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