Nothing
spss.portable.file <- function(
file,
varlab.file=NULL,
codes.file=NULL,
missval.file=NULL,
count.cases=TRUE,
to.lower=getOption("spss.por.to.lower",FALSE),
iconv=TRUE,
encoded=getOption("spss.por.encoding","cp1252"),
negative2missing = FALSE
){
file <- path.expand(file)
check.file(file,error=TRUE)
ptr <- porStream(file)
data.spec <- parseHeaderPorStream(ptr)
types <- data.spec$types
variables <- vector(length(types),mode="list")
variables[types==0] <- list(new("double.item"))
variables[types>0] <- list(new("character.item"))
varprintfmt <- lapply(data.spec$dictionary,"[[",i="printformat")
varprintfmt <- sapply(varprintfmt,"[",i=1)
vardatetime <- varprintfmt %in% c(20,22:24,26:30,38,39)
variables[vardatetime] <- list(new("datetime.item",
tzone="GMT",
origin="1582-10-14"))
names(variables) <- names(types)
varlabs <- lapply(data.spec$dictionary,"[[",i="label")
varlabs <- unlist(varlabs)
if(length(varlabs))
varlabs <- varlabs[nzchar(varlabs)]
vallabs <- data.spec$value.labels
vallabs.vars <- lapply(vallabs,"[[",i="vars")
vallab.tmp <- lapply(seq_along(vallabs),function(i){
ans <- list()
ans[vallabs.vars[[i]]] <- list(vallabs[[i]]$value.labels)
ans
})
vallabs <- unlist(vallab.tmp,recursive=FALSE)
missings <- lapply(data.spec$dictionary,"[[",i="missing")
if(length(varlab.file) && check.file(varlab.file,error=TRUE)){
message("using ",varlab.file)
varlabs <- spss.parse.variable.labels(varlab.file,
iconv=iconv,
encoded=encoded)
}
if(length(codes.file) && check.file(codes.file,error=TRUE)){
message("using ",codes.file)
vallabs <- spss.parse.value.labels(codes.file,
iconv=iconv,
encoded=encoded)
}
if(length(missval.file) && check.file(missval.file,error=TRUE)){
message("using ",missval.file)
missings <- spss.parse.missing.values(missval.file)
}
if(length(varlabs))
variables[names(varlabs)] <- mapply("description<-",variables[names(varlabs)],varlabs)
if(length(vallabs))
suppressWarnings(variables[names(vallabs)] <- mapply("labels<-",variables[names(vallabs)],vallabs))
if(length(missings))
variables[names(missings)] <- mapply("missing.values<-",variables[names(missings)],missings)
if(negative2missing)
variables <- lapply(variables,`valid.range<-`,c(0,Inf))
if(count.cases){
ncases <- .Call("countCasesPorStream",ptr,types)
seekPorStream(ptr,data.spec$start.data)
} else
ncases <- NA
attr(ptr,"ncases") <- ncases
if(to.lower){
names(variables) <- tolower(names(variables))
}
if(iconv)
variables <- lapply(variables,Iconv,from=encoded,to="")
else
encoded = ""
warn_if_duplicate_labels(variables)
document <- data.spec$document
data.spec$document <- NULL
new("spss.portable.importer",
variables,
ptr=ptr,
varlab.file=varlab.file,
codes.file=codes.file,
missval.file=missval.file,
document=document,
data.spec=data.spec,
encoded=encoded
)
}
setMethod("initialize","spss.portable.importer",function(.Object,
variables,
ptr,
varlab.file=character(),
codes.file=character(),
missval.file=character(),
document=character(),
data.spec,
encoded
){
.Object@.Data <- variables
.Object@ptr <- ptr
.Object@varlab.file <- as.character(varlab.file)
.Object@codes.file <- as.character(codes.file)
.Object@missval.file <- as.character(missval.file)
.Object@document <- as.character(document)
.Object@data.spec <- data.spec
.Object@encoded <- encoded
.Object
})
setMethod("getNobs","spss.portable.importer",function(x){
ncases <- attr(x@ptr,"ncases")
if(!length(ncases)) {
seekPorStream(x@ptr,x@data.spec$start.data)
attr(x@ptr,"ncases") <- ncases <- .Call("countCasesPorStream",x@ptr,x@data.spec$types)
seekPorStream(x@ptr,x@data.spec$start.data)
}
ncases
})
setMethod("seekData","spss.portable.importer",function(x)
seekPorStream(x@ptr,x@data.spec$start.data)
)
setMethod("readData","spss.portable.importer",
function(x,n)
iconv_list(.Call("readDataPorStream",
x@ptr,
what=x,
nlines=n,
types=x@data.spec$types),
encoded=x@encoded))
setMethod("readSlice","spss.portable.importer",
function(x,rows,cols)
iconv_list(.Call("readSlicePorStream",x@ptr,
what=x,
j=cols,i=rows,
types=x@data.spec$types),
encoded=x@encoded))
setMethod("readChunk","spss.portable.importer",
function(x,nrows,cols)
iconv_list(.Call("readChunkPorStream",x@ptr,
what=x,
vars=cols,n=nrows,
types=x@data.spec$types),
encoded=x@encoded))
setMethod("show","spss.portable.importer",
function(object){
file.name <- attr(object@ptr,"file.name")
nobs <- nrow(object)
nvar <- ncol(object)
varlab.file <- object@varlab.file
codes.file <- object@codes.file
missval.file <- object@missval.file
cat("\nSPSS portable file",sQuote(file.name),"\n\twith ")
cat(nvar,"variables and ")
cat(nobs,"observations\n")
if(length(varlab.file)) cat("\twith variable labels from file",sQuote(varlab.file),"\n")
if(length(codes.file)) cat("\twith value labels from file",sQuote(codes.file),"\n")
if(length(missval.file)) cat("\twith missing value definitions from file",sQuote(missval.file),"\n")
})
subset.spss.portable.importer <- subset.importer
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