# File src/library/base/R/parse.R
# Part of the R package, https://www.R-project.org
#
# Copyright (C) 1995-2014 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/
parse <- function(file = "", n = NULL, text = NULL, prompt = "?",
keep.source = getOption("keep.source"),
srcfile = NULL, encoding = "unknown")
{
keep.source <- isTRUE(keep.source)
if(!is.null(text)) {
if (length(text) == 0L) return(expression())
if (missing(srcfile)) {
srcfile <- "<text>"
if (keep.source)
srcfile <- srcfilecopy(srcfile, text)
}
file <- stdin()
} else {
if(is.character(file)) {
if(file == "") {
file <- stdin()
if (missing(srcfile))
srcfile <- "<stdin>"
} else {
filename <- file
file <- file(filename, "r")
if (missing(srcfile))
srcfile <- filename
if (keep.source) {
text <- readLines(file, warn = FALSE)
if (!length(text)) text <- ""
close(file)
file <- stdin()
srcfile <-
srcfilecopy(filename, text, file.mtime(filename),
isFile = TRUE)
} else
on.exit(close(file))
}
}
}
.Internal(parse(file, n, text, prompt, srcfile, encoding))
}
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