| # File src/library/base/R/get.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2015 The R Core Team |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # A copy of the GNU General Public License is available at |
| # https://www.R-project.org/Licenses/ |
| |
| exists <- |
| function (x, where = -1, |
| envir = if(missing(frame)) as.environment(where) else sys.frame(frame), |
| frame, mode = "any", inherits = TRUE) |
| .Internal(exists(x, envir, mode, inherits)) |
| |
| get <- |
| function (x, pos = -1L, envir = as.environment(pos), mode = "any", |
| inherits = TRUE) |
| .Internal(get(x, envir, mode, inherits)) |
| |
| get0 <- function (x, envir = pos.to.env(-1L), mode = "any", inherits = TRUE, |
| ifnotfound = NULL) |
| .Internal(get0(x, envir, mode, inherits, ifnotfound)) |
| |
| mget <- function(x, envir = as.environment(-1L), mode = "any", |
| ifnotfound, inherits = FALSE) |
| .Internal(mget(x, envir, mode, |
| if(missing(ifnotfound)) |
| list(function(x) stop(gettextf("value for %s not found", sQuote(x)), |
| call. = FALSE)) |
| else ifnotfound, |
| inherits)) |
| |
| ## DB's proposed name "getSlotOrComponent" is more precise but harder to type |
| getElement <- function(object, name) { |
| if(isS4(object)) methods::slot(object, name) else object[[name, exact=TRUE]] |
| } |