No more quosures

[EmilHvitfeldt]

This PR aims to close #713.

The changes are minimal and very invasive. Mainly involving from enquo() -> enexpr() and enquos() -> enexprs() everywhere, updating tests and making sure that the helper functions don't use quo_get_expr() as it is no longer needed.

TODO:

• finish work related to requires_descrs()
• Remove convert_args() and convert_arg()
• Figure out ranger conf_int bug
• Run all the tests
  • extratests
  • revdepcheck

[EmilHvitfeldt]

since x is no longer a quosure, we have to find the environment differently sometimes. parent.frame(n = 3) get us to the right one

[EmilHvitfeldt]

I am closing this PR since the implementation isn't good enough. In particular the following can't be done which is a dealbreaker

library(parsnip)

boost_tree(mode = "regression") %>%
  fit(mpg ~ ., data = mtcars)
#> parsnip model object
#> 
#> ##### xgb.Booster
#> raw: 21.5 Kb 
#> call:
#>   xgboost::xgb.train(params = list(eta = 0.3, max_depth = 6, gamma = 0, 
#>     colsample_bytree = 1, colsample_bynode = 1, min_child_weight = 1, 
#>     subsample = 1, objective = "reg:squarederror"), data = x$data, 
#>     nrounds = 15, watchlist = x$watchlist, verbose = 0, nthread = 1)
#> params (as set within xgb.train):
#>   eta = "0.3", max_depth = "6", gamma = "0", colsample_bytree = "1", colsample_bynode = "1", min_child_weight = "1", subsample = "1", objective = "reg:squarederror", nthread = "1", validate_parameters = "TRUE"
#> xgb.attributes:
#>   niter
#> callbacks:
#>   cb.evaluation.log()
#> # of features: 10 
#> niter: 15
#> nfeatures : 10 
#> evaluation_log:
#>     iter training_rmse
#>        1    14.9313149
#>        2    10.9568064
#> ---                   
#>       14     0.5628964
#>       15     0.4603055


f <- function(mtry = 2) {
  boost_tree(mode = "regression", mtry = mtry) %>%
    fit(mpg ~ ., data = mtcars)
}

f()
#> Error in FUN(X[[i]], ...): object 'mtry' not found

^{Created on 2022-06-03 by the reprex package (v2.0.1)}

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