| # File src/library/base/R/unlist.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2018 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/ |
| |
| unlist <- function(x, recursive=TRUE, use.names=TRUE) |
| { |
| if(.Internal(islistfactor(x, recursive))) { |
| URapply <- |
| if(recursive) # use rapply() |
| function(x, Fn) .Internal(unlist(rapply(x, Fn, how="list"), recursive, FALSE)) |
| else function(x, Fn) .Internal(unlist(lapply(x, Fn), recursive, FALSE)) |
| lv <- unique(URapply(x, levels)) |
| nm <- if(use.names) names(.Internal(unlist(x, recursive, use.names))) |
| res <- match(URapply(x, as.character), lv) |
| ## we cannot make this ordered as level set may have been changed |
| structure(res, levels=lv, names=nm, class="factor") |
| } else .Internal(unlist(x, recursive, use.names)) |
| } |