Nothing
recurse <- function(object, callback, ...) {
renv_recurse_impl(list(), object, callback, ...)
}
renv_recurse_impl <- function(stack, object, callback, ...) {
# ignore missing values
if (missing(object) || identical(object, quote(expr = )))
return(FALSE)
# push node on to stack
stack[[length(stack) + 1]] <- object
# invoke callback
result <- callback(object, stack, ...)
if (is.call(result))
object <- result
else if (identical(result, FALSE))
return(FALSE)
# recurse
if (is.recursive(object))
for (i in seq_along(object))
renv_recurse_impl(stack, object[[i]], callback, ...)
}
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