R/iter.connection.R

In iterors: Fast, Compact Iterators and Tools

# Copyright (c) 2010, Stephen B. Weston
# Updated 2023 by Peter Meilstrup
#
# This 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
# USA

#' @exportS3Method
#' @rdname iteror
iteror.connection <- function(obj, ...) {
  s <- summary(obj)

  if (s$opened != "opened")
    stop("connection not opened")

  if (s$`can read` != "yes")
    stop("connection not readable")

  if (s$text == "binary")
    ireadBin(obj, ...)
  else
    ireadLines(obj, ...)
}