These helpers are useful to make your function work generically with quosures and raw expressions. First call get_expr() to extract an expression. Once you're done processing the expression, call set_expr() on the original object to update the expression. You can return the result of set_expr(), either a formula or an expression depending on the input type. Note that set_expr() does not change its input, it creates a new object.
An expression, closure, or one-sided formula. In addition, set_expr() accept frames.
A default expression to return when x is not an expression wrapper. Defaults to x itself.
The updated original input for set_expr(). A raw expression for get_expr().
quo_get_expr() and quo_set_expr() for versions of get_expr() and set_expr() that only work on quosures.
#> Warning: `ctxt_frame()` is soft-deprecated as of rlang 0.3.0.