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spss.file <- function(file,...){
if(grepl("\\.por$",file) || grepl("\\.POR$",file))
spss.portable.file(file,...)
else
spss.system.file(file,...)
}
spss.system.file <- function(
file,
varlab.file=NULL,
codes.file=NULL,
missval.file=NULL,
count.cases=TRUE,
to.lower=getOption("spss.sav.to.lower",FALSE),
iconv=TRUE,
encoded=getOption("spss.sav.encoding","cp1252"),
ignore.scale.info = FALSE,
negative2missing = FALSE
){
file <- path.expand(file)
check.file(file,error=TRUE)
ptr <- .Call("NewSysFile",file)
data.spec <- parseSysHeader(ptr)
types <- data.spec$types
varnames <- names(data.spec$variables)
varlabs <- lapply(data.spec$variables,"[[",i="label")
varlabs <- unlist(varlabs[sapply(varlabs,length)>0])
vallabs <- data.spec$value.labels
vallabs.vars <- lapply(vallabs,"[[",i="variables")
vallabs.vars <- lapply(vallabs.vars,function(i)names(types)[i])
vallab.tmp <- lapply(seq_along(vallabs),function(i){
ans <- list()
ans[vallabs.vars[[i]]] <- list(vallabs[[i]]$labels)
ans
})
vallabs <- unlist(vallab.tmp,recursive=FALSE)
names.vallabs <- names(vallabs)
string.vallabs <- types[names.vallabs] > 0
vallabs[string.vallabs] <- lapply(vallabs[string.vallabs],spss.string.vallabs)
missings <- mapply(function(v,r)list(values=v,range=r),
data.spec$missings$values,
data.spec$missings$ranges,
SIMPLIFY=FALSE
)
missings <- lapply(missings,function(x)if(!length(x$values) & !length(x$range))NULL else x)
missings <- missings[sapply(missings,length)>0]
varprintfmt <- lapply(data.spec$variables,"[[",i="print")
varprintfmt <- sapply(varprintfmt,"[",i=3)
vardatetime <- varprintfmt %in% c(20,22:24,26:30,38,39)
variables <- vector(length(types),mode="list")
names(variables) <- names(types)
variables[types==0] <- list(new("double.item"))
variables[types>0] <- list(new("character.item"))
variables[types<0] <- NULL
variables[vardatetime] <- list(new("datetime.item",
tzone="GMT",
origin="1582-10-14"))
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)){
unique_ <- function(x){
dup <- duplicated(x)
x[!dup]
}
vallabs <- lapply(vallabs,unique_)
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))
ncases <- data.spec$header$ncases
if(ncases < 0){
if(count.cases){
.Call("rewind_sysfile",ptr)
ncases <- .Call("count_cases_sysfile",ptr)
.Call("rewind_sysfile",ptr)
}
else
ncases <- NA
}
attr(ptr,"ncases") <- ncases
document <- data.spec$document
data.spec$document <- NULL
aux <- data.spec$auxiliaries
if(length(aux$aux_var) && !ignore.scale.info){
aux_var <- do.call("rbind",aux$aux_var)
mlev <- aux_var[,1]
mlev[mlev==0] <- 1
mlev <- c("nominal","ordinal","interval")[mlev]
variables <- mapply("measurement<-",variables,mlev)
}
if(to.lower){
names(variables) <- tolower(names(variables))
}
if(length(aux$aux_enc)){
encoding2 <- toupper(aux$aux_enc)
if(encoding2 %in% iconvlist()){
encoding <- encoding2
message(sprintf("File character set is '%s'.",encoding))
}
else {
warning(sprintf("File contains unsupported character set '%s', using fallback.",encoding2))
encoding <- encoded
}
}
else if(length(aux$info_int32)){
encoding <- aux$info_int32["character_code"]
enc_table <- c("EBCDICUS"=1,
"ASCII"=2,
"ASCII"=3,
"DEC Kanji"=4,
"CP1250"=1250,
"CP1252"=1252,
"ISO8859-1"=28591,
"UTF-8"=65001)
encoding1 <- names(enc_table)[match(encoding,enc_table)]
if(encoding1 %in% iconvlist()){
encoding <- encoding1
message(sprintf("File character set is '%s'.",encoding))
}
else {
warning(sprintf("File contains unsupported character set '%s', using fallback.",encoding1))
encoding <- encoded
}
}
else {
encoding <- encoded
message("File does not contain character set encoding information, using fallback.")
}
if(iconv){
message(sprintf("Converting character set to UTF-8."))
variables <- lapply(variables,Iconv,from=encoding,to="UTF-8")
}
warn_if_duplicate_labels(variables)
new("spss.system.importer",
variables,
ptr=ptr,
varlab.file=varlab.file,
codes.file=codes.file,
missval.file=missval.file,
document=document,
data.spec=data.spec,
encoded=encoding
)
}
setMethod("initialize","spss.system.importer",function(.Object,
variables,
ptr,
varlab.file=character(),
codes.file=character(),
missval.file=character(),
document=character(),
data.spec,
encoded=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.system.importer",function(x){
ncases <- attr(x@ptr,"ncases")
if(!length(ncases)) {
.Call("rewind_sysfile",x@ptr)
attr(x@ptr,"ncases") <- ncases <- .Call("count_cases_sysfile",x@ptr)
.Call("rewind_sysfile",x@ptr)
}
ncases
})
setMethod("seekData","spss.system.importer",function(x){
if(!.Call("check_pointer",x@ptr)) stop("pointer is NULL, you need to recreate the object")
.Call("rewind_sysfile",x@ptr)
})
setMethod("readData","spss.system.importer",
function(x,n){
if(!.Call("check_pointer",x@ptr)) stop("pointer is NULL, you need to recreate the object")
iconv_list(.Call("read_sysfile_data",
x@ptr,
what=x,
ncases=n,
types=x@data.spec$types),
encoded=x@encoded)
})
setMethod("readSlice","spss.system.importer",
function(x,rows,cols){
if(!.Call("check_pointer",x@ptr)) stop("pointer is NULL, you need to recreate the object")
iconv_list(.Call("read_sysfile_slice",x@ptr,
what=x,
j=cols,i=rows,
types=x@data.spec$types),
encoded=x@encoded)
})
setMethod("readChunk","spss.system.importer",
function(x,nrows,cols){
if(!.Call("check_pointer",x@ptr)) stop("pointer is NULL, you need to recreate the object")
iconv_list(.Call("read_sysfile_chunk",x@ptr,
what=x,
vars=cols,n=nrows,
types=x@data.spec$types),
encoded=x@encoded)
})
setMethod("show","spss.system.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 system 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.system.importer <- subset.importer
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