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# Namespace related functions
#
# Author: Renaud Gaujoux
# Creation: 30 Apr 2012
###############################################################################
is_funcall <- function(fun){
n <- sys.nframe()
i <- 1
dg <- digest(fun)
while( i <= n ){
f <- sys.function(i)
ca <- sys.call(i)
# cat(digest(f), dg, getPackageName(environment(f), FALSE), "\n")
if( digest(f) == dg ) return(i)
i <- i + 1
}
FALSE
}
is_pkgcall <- function(pkg){
pkg %in% pkg_calls()
}
pkg_calls <- function(){
n <- sys.nframe() - 1
i <- 1
res <- character()
while( i <= n ){
f <- sys.function(i)
e <- environment(f)
if( !is.null(e) ){
pkg <- methods::getPackageName(e, create=FALSE)
if( pkg != '' ) res <- c(res, pkg)
}
i <- i + 1
}
res
}
#' Namespace Development Functions
#'
#' \code{getLoadingNamespace} returns information about the loading namespace.
#' It is a wrapper to \code{\link{loadingNamespaceInfo}}, that does not throw
#' an error.
#'
#' @param env logical that indicates that the namespace's environment (i.e. the
#' namespace itself) should be returned.
#' @param info logical that indicates that the complete information list should
#' be returned
#'
#' @return the name of the loading namespace if \code{env} and \code{info} are
#' \code{FALSE}, an environment if \code{env=TRUE}, a list with elements
#' \code{pkgname} and \code{libname} if \code{info=TRUE}.
#'
#' @rdname namespace
#' @export
#'
getLoadingNamespace <- function(env=FALSE, info=FALSE, nodev=FALSE){
is.loading <- try(nsInfo <- loadingNamespaceInfo(), silent=TRUE)
if( !is(is.loading, 'try-error') ){
if( env ) asNamespace(as.name(nsInfo$pkgname))
else if( info ){
nsInfo$path <- file.path(nsInfo$libname, nsInfo$pkgname)
nsInfo
}else nsInfo$pkgname
}else if( !nodev ){ # devtools namespaces are allowed
if( (is_pkgcall('devtools') && (i <- is_funcall(ns_get('devtools::load_all')))) ||
(is_pkgcall('pkgload') && (i <- is_funcall(ns_get('pkgload::load_all')))) || # for devtools > 1.12
(is_pkgcall('roxygen24') && (i <- is_funcall(ns_get('roxygen24::source_package')))) ){
# find out the package that is currently being loaded by load_all
e <- sys.frame(i)
pkg <- e[["pkg"]]
if( is.null(pkg) ){ # try to load from path
if( is.null(path <- e[["path"]]) ) stop("Could not infer loading namespace")
pkg <- as_package(path)
}
# extract namespace
if( env ){
if( isDevNamespace(pkg$package) ) asNamespace(pkg$package)
else pkg$ns
}else if( info ){
list(
pkgname = pkg$package
, path = pkg$path
, libname = dirname(pkg$path)
)
}else pkg$package
}
}
else NULL
}
#' @describeIn namespace Tests if a namespace is being loaded.
#'
#' @param ns the name of a namespace or a namespace whose loading state is tested.
#' If missing \code{isLoadingNamespace} test if any namespace is being loaded.
#' @param nodev logical that indicates if loading devtools namespace should
#' be discarded.
#'
#' @return * `isLoadingNamespace` returns a logical flag.
#' @export
isLoadingNamespace <- function(ns, nodev=FALSE){
if( missing(ns) ) !is.null(getLoadingNamespace(nodev=nodev))
else{
nspkg <- getLoadingNamespace(nodev=nodev, env=is.environment(ns))
if( is.null(nspkg) ) FALSE
else identical(nspkg, ns)
}
}
#' @describeIn namespace tests if a given namespace is loaded, without loading it,
#' contrary to \code{\link{isNamespace}}.
#' It is similar to \code{\link{isNamespaceLoaded}} -- which it uses -- but also accepts
#' environments.
#'
#' @return * `isNamespaceLoaded2` returns a logical flag.
#' @export
isNamespaceLoaded2 <- isNamespaceLoaded <- function(ns){
if( is.environment(ns) ){
if( !isNamespace(ns) ) return(FALSE)
else ns <- getPackageName(ns)
}
if( isString(ns) ) base::isNamespaceLoaded(ns)
else stop("Invalid argument `ns`: only support strings and environments.")
}
#' @describeIn namespace tests the -- current -- namespace is a devtools namespace.
#'
#' @return * `isDevNamespace` returns a logical flag.
#' @export
isDevNamespace <- function(ns){
if( missing(ns) ){
e <- parent.frame()
ns <- methods::getPackageName(topenv(e))
}
# cannot be true if the namespace is not loaded
if( !isNamespaceLoaded(ns) ) return( FALSE )
# get the namespace environment
if( isString(ns) ) ns <- asNamespace(ns)
# check for the presence of a .__DEVTOOLS__ object
exists('.__DEVTOOLS__', where=ns)
}
#' @describeIn namespace Dynamically adds exported objects into the loading namespace.
#'
#' @param x character vector containing the names of R objects to export in the
#' loading namespace.
#'
#' @export
addNamespaceExport <- function(x){
ns <- pkgmaker::getLoadingNamespace(env=TRUE)
if( !is.null(ns) ){
namespaceExport(ns, x)
}
}
#' @describeIn namespace gets an object from a given namespace.
#' @param ... extra arguments passed to [get0].
#'
#' @return * `ns_get` returns the requested object or `NULL` if not found.
#' @export
ns_get <- function(x, ns = NULL, ...){
if( is.null(ns) ){
ns <- gsub("^([^:]+)::.*", "\\1", x)
x <- gsub(".*::([^:]+)$", "\\1", x)
}
if( !isNamespace(ns) ){
ns <- tryCatch(asNamespace(ns), error = function(e) NULL)
if( is.null(ns) ) return()
}
get0(x, envir = ns, ...)
}
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