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### This file is part of the 'foreign' package for R.
# Copyright (c) 2004-5 R Development Core Team
# Enhancements Copyright (c) 2006 Stephen Weigand
# 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
# http://www.r-project.org/Licenses/
make.SAS.names <- function(varnames, validvarname = c("V7", "V6")){
validvarname <- match.arg(validvarname)
nmax <- if(validvarname == "V7") 32L else 8L
x <- sub("^([0-9])", "_\\1", varnames)
x <- gsub("[^a-zA-Z0-9_]", "_", x)
x <- abbreviate(x, minlength = nmax)
if (any(nchar(x) > nmax) || any(duplicated(x)))
stop("Cannot uniquely abbreviate the variable names to ",
nmax, " or fewer characters")
names(x) <- varnames
x
}
make.SAS.formats <- function(varnames){
x <- sub("^([0-9])", "_\\1", varnames)
x <- gsub("[^a-zA-Z0-9_]", "_", x)
x <- sub("([0-9])$", "\\1f", x) # can't end in digit so append 'f'
x <- abbreviate(x, minlength = 8L)
if(any(nchar(x) > 8L) || any(duplicated(x)))
stop("Cannot uniquely abbreviate format names to conform to ",
" eight-character limit and not ending in a digit")
names(x) <- varnames
x
}
writeForeignSAS <- function(df, datafile, codefile, dataname="rdata",
validvarname = c("V7", "V6"))
{
## FIXME: re-write this to hold a connection open
factors <- sapply(df, is.factor)
strings <- sapply(df, is.character)
dates <- sapply(df, FUN = function(x) inherits(x, "Date") || inherits(x, "dates") || inherits(x, "date"))
xdates <- sapply(df, FUN = function(x) inherits(x, "dates") || inherits(x, "date"))
datetimes <- sapply(df, FUN = function(x) inherits(x, "POSIXt"))
varlabels <- names(df)
varnames <- make.SAS.names(names(df), validvarname = validvarname)
if (any(varnames != varlabels))
message("Some variable names were abbreviated or otherwise altered.")
dfn <- df
if (any(factors))
dfn[factors] <- lapply(dfn[factors], as.numeric)
if (any(datetimes))
dfn[datetimes] <- lapply(dfn[datetimes],
function(x) format(x, "%d%b%Y %H:%M:%S"))
if(any(xdates))
dfn[xdates] <- lapply(dfn[xdates], function(x) as.Date(as.POSIXct(x)))
write.table(dfn, file = datafile, row = FALSE, col = FALSE,
sep = ",", quote = TRUE, na = "")
lrecl <- max(sapply(readLines(datafile),nchar)) + 4L
cat("* Written by R;\n", file = codefile)
cat("* ", deparse(sys.call(-2L))[1L], ";\n\n",
file = codefile, append = TRUE)
if (any(factors)) {
cat("PROC FORMAT;\n", file=codefile, append=TRUE)
fmtnames <- make.SAS.formats(varnames[factors])
fmt.values <- lapply(df[, factors, drop = FALSE], levels)
names(fmt.values) <- fmtnames
for (f in fmtnames) {
cat("value", f, "\n", file = codefile, append = TRUE)
values <- fmt.values[[f]]
for(i in 1L:length(values)){
cat(" ", i,"=", adQuote(values[i]), "\n",
file=codefile, append=TRUE)
}
cat(";\n\n",file=codefile,append=TRUE)
}
}
cat("DATA ", dataname, ";\n", file = codefile, append = TRUE)
if (any(strings)) {
cat("LENGTH", file = codefile, append = TRUE)
lengths <- sapply(df[,strings, drop = FALSE],
FUN = function(x) max(nchar(x)))
names(lengths) <- varnames[strings]
for(v in varnames[strings])
cat("\n", v, "$", lengths[v], file = codefile, append = TRUE)
cat("\n;\n\n", file = codefile, append = TRUE)
}
if (any(dates)) {
cat("INFORMAT", file = codefile, append = TRUE)
for(v in varnames[dates])
cat("\n", v, file = codefile, append = TRUE)
cat("\n YYMMDD10.\n;\n\n", file = codefile, append = TRUE)
}
if (any(datetimes)) {
cat("INFORMAT", file = codefile, append = TRUE)
for(v in varnames[datetimes])
cat("\n", v, file = codefile, append = TRUE)
cat("\n DATETIME18.\n;\n\n", file = codefile, append = TRUE)
}
cat("INFILE ",adQuote(datafile),
"\n DSD",
"\n LRECL=", lrecl, ";\n",
file = codefile ,append = TRUE)
cat("INPUT", file = codefile, append = TRUE)
for(v in 1L:ncol(df))
cat("\n", varnames[v], file = codefile, append = TRUE)
if(strings[v]) cat(" $ ", file = codefile, append = TRUE)
cat("\n;\n", file = codefile, append = TRUE)
for(v in 1L:ncol(df))
if (varnames[v] != names(varnames)[v])
cat("LABEL ", varnames[v],"=", adQuote(varlabels[v]), ";\n",
file = codefile, append = TRUE)
if (any(factors))
for (f in 1L:length(fmtnames))
cat("FORMAT", names(fmtnames)[f], paste(fmtnames[f],".", sep = ""),
";\n", file = codefile, append = TRUE)
if (any(dates))
for(v in varnames[dates])
cat("FORMAT", v, "yymmdd10.;\n", file = codefile, append = TRUE)
if (any(datetimes))
for(v in varnames[datetimes])
cat("FORMAT", v, "datetime18.;\n", file = codefile, append = TRUE)
cat("RUN;\n", file= codefile, append = TRUE)
}
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