The R Project SVN R

#  File src/library/utils/R/fix.R
#  Part of the R package, https://www.R-project.org
#
#  Copyright (C) 1995-2012 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/

fix <- function (x, ...)
{
    subx <- substitute(x)
    if (is.name(subx))
        subx <- deparse(subx)
    if (!is.character(subx) || length(subx) != 1L)
        stop("'fix' requires a name")
    parent <- parent.frame()
    if (exists(subx, envir=parent, inherits = TRUE))
        x <- edit(get(subx, envir=parent), title = subx, ...)
    else {
        x <- edit(function(){}, title = subx, ...)
        environment(x) <- .GlobalEnv
    }
    assign(subx, x, envir = .GlobalEnv)
}