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| Original file line number | Diff line number | Diff line change |
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| # Standalone file: do not edit by hand | ||
| # Source: <https://github.com/r-lib/rlang/blob/main/R/standalone-s3-register.R> | ||
| # ---------------------------------------------------------------------- | ||
| # | ||
| # --- | ||
| # repo: r-lib/rlang | ||
| # file: standalone-s3-register.R | ||
| # last-updated: 2022-08-29 | ||
| # license: https://unlicense.org | ||
| # --- | ||
| # | ||
| # nocov start | ||
|
|
||
| #' Register a method for a suggested dependency | ||
| #' | ||
| #' Generally, the recommended way to register an S3 method is to use the | ||
| #' `S3Method()` namespace directive (often generated automatically by the | ||
| #' `@export` roxygen2 tag). However, this technique requires that the generic | ||
| #' be in an imported package, and sometimes you want to suggest a package, | ||
| #' and only provide a method when that package is loaded. `s3_register()` | ||
| #' can be called from your package's `.onLoad()` to dynamically register | ||
| #' a method only if the generic's package is loaded. | ||
| #' | ||
| #' For R 3.5.0 and later, `s3_register()` is also useful when demonstrating | ||
| #' class creation in a vignette, since method lookup no longer always involves | ||
| #' the lexical scope. For R 3.6.0 and later, you can achieve a similar effect | ||
| #' by using "delayed method registration", i.e. placing the following in your | ||
| #' `NAMESPACE` file: | ||
| #' | ||
| #' ``` | ||
| #' if (getRversion() >= "3.6.0") { | ||
| #' S3method(package::generic, class) | ||
| #' } | ||
| #' ``` | ||
| #' | ||
| #' @section Usage in other packages: | ||
| #' To avoid taking a dependency on vctrs, you copy the source of | ||
| #' [`s3_register()`](https://github.com/r-lib/rlang/blob/main/R/standalone-s3-register.R) | ||
| #' into your own package. It is licensed under the permissive | ||
| #' [unlicense](https://choosealicense.com/licenses/unlicense/) to make it | ||
| #' crystal clear that we're happy for you to do this. There's no need to include | ||
| #' the license or even credit us when using this function. | ||
| #' | ||
| #' @param generic Name of the generic in the form `"pkg::generic"`. | ||
| #' @param class Name of the class | ||
| #' @param method Optionally, the implementation of the method. By default, | ||
| #' this will be found by looking for a function called `generic.class` | ||
| #' in the package environment. | ||
| #' @examples | ||
| #' # A typical use case is to dynamically register tibble/pillar methods | ||
| #' # for your class. That way you avoid creating a hard dependency on packages | ||
| #' # that are not essential, while still providing finer control over | ||
| #' # printing when they are used. | ||
| #' | ||
| #' .onLoad <- function(...) { | ||
| #' s3_register("pillar::pillar_shaft", "vctrs_vctr") | ||
| #' s3_register("tibble::type_sum", "vctrs_vctr") | ||
| #' } | ||
| #' @keywords internal | ||
| #' @noRd | ||
| s3_register <- function(generic, class, method = NULL) { | ||
| stopifnot(is.character(generic), length(generic) == 1) | ||
| stopifnot(is.character(class), length(class) == 1) | ||
|
|
||
| pieces <- strsplit(generic, "::")[[1]] | ||
| stopifnot(length(pieces) == 2) | ||
| package <- pieces[[1]] | ||
| generic <- pieces[[2]] | ||
|
|
||
| caller <- parent.frame() | ||
|
|
||
| get_method_env <- function() { | ||
| top <- topenv(caller) | ||
| if (isNamespace(top)) { | ||
| asNamespace(environmentName(top)) | ||
| } else { | ||
| caller | ||
| } | ||
| } | ||
| get_method <- function(method) { | ||
| if (is.null(method)) { | ||
| get(paste0(generic, ".", class), envir = get_method_env()) | ||
| } else { | ||
| method | ||
| } | ||
| } | ||
|
|
||
| register <- function(...) { | ||
| envir <- asNamespace(package) | ||
|
|
||
| # Refresh the method each time, it might have been updated by | ||
| # `devtools::load_all()` | ||
| method_fn <- get_method(method) | ||
| stopifnot(is.function(method_fn)) | ||
|
|
||
|
|
||
| # Only register if generic can be accessed | ||
| if (exists(generic, envir)) { | ||
| registerS3method(generic, class, method_fn, envir = envir) | ||
| } else if (identical(Sys.getenv("NOT_CRAN"), "true")) { | ||
| warn <- .rlang_s3_register_compat("warn") | ||
|
|
||
| warn(c( | ||
| sprintf( | ||
| "Can't find generic `%s` in package %s to register S3 method.", | ||
| generic, | ||
| package | ||
| ), | ||
| "i" = "This message is only shown to developers using devtools.", | ||
| "i" = sprintf("Do you need to update %s to the latest version?", package) | ||
| )) | ||
| } | ||
| } | ||
|
|
||
| # Always register hook in case package is later unloaded & reloaded | ||
| setHook(packageEvent(package, "onLoad"), function(...) { | ||
| register() | ||
| }) | ||
|
|
||
| # For compatibility with R < 4.1.0 where base isn't locked | ||
| is_sealed <- function(pkg) { | ||
| identical(pkg, "base") || environmentIsLocked(asNamespace(pkg)) | ||
| } | ||
|
|
||
| # Avoid registration failures during loading (pkgload or regular). | ||
| # Check that environment is locked because the registering package | ||
| # might be a dependency of the package that exports the generic. In | ||
| # that case, the exports (and the generic) might not be populated | ||
| # yet (#1225). | ||
| if (isNamespaceLoaded(package) && is_sealed(package)) { | ||
| register() | ||
| } | ||
|
|
||
| invisible() | ||
| } | ||
|
|
||
| .rlang_s3_register_compat <- function(fn, try_rlang = TRUE) { | ||
| # Compats that behave the same independently of rlang's presence | ||
| out <- switch( | ||
| fn, | ||
| is_installed = return(function(pkg) requireNamespace(pkg, quietly = TRUE)) | ||
| ) | ||
|
|
||
| # Only use rlang if it is fully loaded (#1482) | ||
| if (try_rlang && | ||
| requireNamespace("rlang", quietly = TRUE) && | ||
| environmentIsLocked(asNamespace("rlang"))) { | ||
| switch( | ||
| fn, | ||
| is_interactive = return(rlang::is_interactive) | ||
| ) | ||
|
|
||
| # Make sure rlang knows about "x" and "i" bullets | ||
| if (utils::packageVersion("rlang") >= "0.4.2") { | ||
| switch( | ||
| fn, | ||
| abort = return(rlang::abort), | ||
| warn = return((rlang::warn)), | ||
| inform = return(rlang::inform) | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| # Fall back to base compats | ||
|
|
||
| is_interactive_compat <- function() { | ||
| opt <- getOption("rlang_interactive") | ||
| if (!is.null(opt)) { | ||
| opt | ||
| } else { | ||
| interactive() | ||
| } | ||
| } | ||
|
|
||
| format_msg <- function(x) paste(x, collapse = "\n") | ||
| switch( | ||
| fn, | ||
| is_interactive = return(is_interactive_compat), | ||
| abort = return(function(msg) stop(format_msg(msg), call. = FALSE)), | ||
| warn = return(function(msg) warning(format_msg(msg), call. = FALSE)), | ||
| inform = return(function(msg) message(format_msg(msg))) | ||
| ) | ||
|
|
||
| stop(sprintf("Internal error in rlang shims: Unknown function `%s()`.", fn)) | ||
| } | ||
|
|
||
| # nocov end |
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