substituting - Githubissues

inspired by :

we proposed :

 substitute2 <- function(
  expr, ..., depth = 0, env = parent.frame(), expand = NULL, eval = FALSE) { ...}

But it would be nice to have substituting, just like we'll have using, maybe also with a method for [

substituting(...)$fun(...)
substituting(...)[expr] # or/and
substituting(...)[[expr]] #

We need to add .enclos arg
We need to dot all args
.enclos and .envir are passed to eval / eval_tidy when evaluating the substituted expression (if eval is TRUE), they're also passed to expand by default.
eval is FALSE by default for substitute2, but it's TRUE for substituting
I don't think depth is needed much in practice, we can either keep the input unevaluated, use !! on it to unquote it once, and use !! eval(expr) with as many eval calls as necessary, which more control on envir and enclos. *expand is FALSE by default, if it is TRUE it expands the input using .envir and .enclos, if it is an environment we'll forward it to the envir arg of expand, if it's a list of 2, first goes to envir, second to enclos.
!! is supported in the ... arguments of substitute2 / substituting but also in expr and the arguments of the mf of substituting

substitute2 <- function(expr, ..., depth = 0, env = parent.frame(), expand = NULL, eval = FALSE) { ...}

moodymudskipper / tags