| # File src/library/base/R/mode.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/ |
| |
| mode <- function(x) { |
| if(is.expression(x)) return("expression") |
| if(is.call(x)) |
| return(switch(deparse(x[[1L]])[1L], |
| "(" = "(", |
| ## otherwise |
| "call")) |
| if(is.name(x)) "name" else |
| switch(tx <- typeof(x), |
| double =, integer = "numeric", # 'real=' dropped, 2000/Jan/14 |
| closure =, builtin =, special = "function", |
| ## otherwise |
| tx) |
| } |
| |
| `mode<-` <- function(x, value) |
| { |
| if (storage.mode(x) == value) return(x) |
| if(is.factor(x)) stop("invalid to change the storage mode of a factor") |
| atr <- attributes(x) |
| isSingle <- !is.null(attr(x, "Csingle")) |
| setSingle <- value == "single" |
| mde <- get(paste0("as.",value), mode = "function", envir = parent.frame()) |
| x <- mde(x) |
| attributes(x) <- atr |
| ## this avoids one copy |
| if(setSingle != isSingle) |
| attr(x, "Csingle") <- if(setSingle) TRUE # else NULL |
| x |
| } |
| |
| storage.mode <- function(x) |
| switch(tx <- typeof(x), |
| closure = , builtin = , special = "function", |
| ## otherwise |
| tx) |
| |
| ### storage.mode<- is primitive as from R 2.6.0 |