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#' @title Define a target using unrefined names and language objects.
#' @export
#' @family targets
#' @description `tar_target_raw()` is just like [tar_target()] except
#' it avoids non-standard evaluation for the arguments: `name`
#' is a character string, `command` and `pattern` are language objects,
#' and there is no `tidy_eval` argument. Use `tar_target_raw()`
#' instead of [tar_target()] if you are creating entire batches
#' of targets programmatically (metaprogramming, static branching).
#' @return A target object. Users should not modify these directly,
#' just feed them to [list()] in your target script file
#' (default: `_targets.R`).
#' See the "Target objects" section for details.
#' @inheritSection tar_target Target objects
#' @inheritParams tar_target
#' @inheritParams tar_option_set
#' @param name Character of length 1, name of the target. A target
#' name must be a valid name for a symbol in R, and it
#' must not start with a dot. Subsequent targets
#' can refer to this name symbolically to induce a dependency relationship:
#' e.g. `tar_target(downstream_target, f(upstream_target))` is a
#' target named `downstream_target` which depends on a target
#' `upstream_target` and a function `f()`. In addition, a target's
#' name determines its random number generator seed. In this way,
#' each target runs with a reproducible seed so someone else
#' running the same pipeline should get the same results,
#' and no two targets in the same pipeline share the same seed.
#' (Even dynamic branches have different names and thus different seeds.)
#' You can recover the seed of a completed target
#' with `tar_meta(your_target, seed)` and run [tar_seed_set()]
#' on the result to locally recreate the target's initial RNG state.
#' @param command Similar to the `command` argument of [`tar_target()`] except
#' the object must already be an expression instead of
#' informally quoted code.
#' `base::expression()` and `base::quote()` can produce such objects.
#' @param pattern Similar to the `pattern` argument of [`tar_target()`]
#' except the object must already be an expression instead of
#' informally quoted code.
#' `base::expression()` and `base::quote()` can produce such objects.
#' @param deps Optional character vector of the adjacent upstream
#' dependencies of the target, including targets and global objects.
#' If `NULL`, dependencies are resolved automatically as usual.
#' The `deps` argument is only for developers of extension
#' packages such as `tarchetypes`,
#' not for end users, and it should almost never be used at all.
#' In scenarios that at first appear to requires `deps`,
#' there is almost always a simpler and more robust workaround
#' that avoids setting `deps`.
#' @param string Optional string representation of the command.
#' Internally, the string gets hashed to check if the command changed
#' since last run, which helps `targets` decide whether the
#' target is up to date. External interfaces can take control of
#' `string` to ignore changes in certain parts of the command.
#' If `NULL`, the strings is just deparsed from `command` (default).
#' @examples
#' # The following are equivalent.
#' y <- tar_target(y, sqrt(x), pattern = map(x))
#' y <- tar_target_raw("y", expression(sqrt(x)), expression(map(x)))
#' # Programmatically create a chain of interdependent targets
#' target_list <- lapply(seq_len(4), function(i) {
#' tar_target_raw(
#' letters[i + 1],
#' substitute(do_something(x), env = list(x = as.symbol(letters[i])))
#' )
#' })
#' print(target_list[[1]])
#' print(target_list[[2]])
#' if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
#' tar_dir({ # tar_dir() runs code from a temp dir for CRAN.
#' tar_script(tar_target_raw("x", quote(1 + 1)), ask = FALSE)
#' tar_make()
#' tar_read(x)
#' })
#' }
tar_target_raw <- function(
name,
command,
pattern = NULL,
packages = targets::tar_option_get("packages"),
library = targets::tar_option_get("library"),
deps = NULL,
string = NULL,
format = targets::tar_option_get("format"),
repository = targets::tar_option_get("repository"),
iteration = targets::tar_option_get("iteration"),
error = targets::tar_option_get("error"),
memory = targets::tar_option_get("memory"),
garbage_collection = targets::tar_option_get("garbage_collection"),
deployment = targets::tar_option_get("deployment"),
priority = targets::tar_option_get("priority"),
resources = targets::tar_option_get("resources"),
storage = targets::tar_option_get("storage"),
retrieval = targets::tar_option_get("retrieval"),
cue = targets::tar_option_get("cue"),
description = targets::tar_option_get("description")
) {
tar_assert_nonmissing(name)
tar_assert_name(name)
tar_assert_nonmissing(command, paste("target", name, "has no command."))
if (is.expression(command)) {
tar_assert_nonmissing(
command[[1]],
paste("target", name, "has no command.")
)
}
tar_assert_scalar(
as.expression(command),
paste("the command of target", name, "must have length 1.")
)
tar_assert_chr(packages)
tar_assert_chr(
library %|||% character(0),
"library in tar_target_raw() must be NULL or character."
)
tar_assert_format(format)
tar_assert_repository(repository)
if (format == "file_fast" && repository != "local") {
format <- "file"
}
tar_assert_flag(iteration, c("vector", "list", "group"))
tar_assert_flag(
error,
c("stop", "continue", "abridge", "workspace", "null")
)
deprecate_error_workspace(error)
tar_assert_flag(memory, c("persistent", "transient"))
tar_assert_lgl(garbage_collection)
tar_assert_scalar(garbage_collection)
tar_assert_flag(deployment, c("worker", "main"))
tar_assert_dbl(priority)
tar_assert_scalar(priority)
tar_assert_ge(priority, 0)
tar_assert_le(priority, 1)
tar_assert_resources(resources)
tar_assert_flag(storage, c("main", "worker", "none"))
tar_assert_flag(retrieval, c("main", "worker", "none"))
warn_error_format(error = error, format = format)
if (!is.null(cue)) {
cue_validate(cue)
}
tar_assert_chr(description)
tar_assert_scalar(description %||% "x")
tar_assert_none_na(description)
tar_assert_true(
is.null(pattern) || (iteration != "group"),
msg = sprintf(
paste(
"\"group\" iteration is invalid for dynamic targets such as %s.",
"(e.g. with pattern = %s in tar_target()). You can either",
"set iteration = \"group\" or set a dynamic branching pattern like",
"pattern = %s, but please avoid doing both for the same target."
),
name,
tar_deparse_language(pattern),
tar_deparse_language(pattern)
)
)
target_init(
name = name,
expr = command,
pattern = pattern,
packages = packages,
library = library,
deps = deps,
string = string,
format = format,
repository = repository,
iteration = iteration,
error = error,
memory = memory,
garbage_collection = garbage_collection,
deployment = deployment,
priority = priority,
resources = resources,
storage = storage,
retrieval = retrieval,
cue = cue,
description = description
)
}
warn_error_format <- function(error, format) {
if (format %in% c("keras", "torch") && error == "null") {
message <- paste0(
"In targets, format = \"",
format,
"\" is incompatible with error = \"null\" ",
"(and superseded by tar_format())."
)
tar_warn_deprecate(message)
}
}
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