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## labels ################################################################################
setMethod("initialize","value.labels",function(.Object,...){
args <- list(...)
values <- args$values
labels <- args[[1]]
ii <- order(values)
values <- values[ii]
labels <- labels[ii]
labels <- iconv(labels,from="",to="UTF-8")
Encoding(labels) <- "UTF-8"
.Object@.Data <- labels
.Object@values <- values
if(validObject(.Object)) return(.Object)
})
setValidity("value.labels",function(object){
if(length(object@.Data)==length(object@values)){
if(length(unique(object@.Data))<=length(unique(object@values))) TRUE
else paste("More labels than labelled values:\n",
" ",length(unique(object@.Data)),"unique labels\n",
" ",length(unique(object@values)),"labelled values")
}
else paste("There are",length(object@values),"values, but",
length(object@.Data),"labels")
})
setMethod("labels","NULL",function(object,...)NULL)
setMethod("labels","item",function(object,...)object@value.labels)
setMethod("labels<-",signature(x="item",value="ANY"),function(x,value){
x@value.labels<-as(value,"value.labels")
x
})
setMethod("labels<-",signature(x="ANY",value="NULL"),function(x,value) x)
setMethod("labels<-",signature(x="item",value="NULL"),function(x,value){
x@value.labels<-NULL
x
})
setMethod("labels<-",signature(x="vector",value="NULL"),function(x,value) x)
setMethod("labels<-",signature(x="vector",value="ANY"),function(x,value)as.item(x,
labels=as(value,"value.labels")))
format.value.labels <- function(x,...){
paste(format(x@values,justify="right"),format(sQuote(x@.Data),justify="left"))
}
print.value.labels <- function(x,...) writeLines(format.value.labels(x))
setMethod("show","value.labels",function(object){
writeLines(c("",
" Values and labels:",
"",
paste(" ",format.value.labels(object)),
""))
})
setMethod("[",signature(x="value.labels",i="numeric",j="missing",drop="missing"),
function(x,i) new("value.labels",x@.Data[i], values=x@values[i])
)
setMethod("[",signature(x="value.labels",i="logical",j="missing",drop="missing"),
function(x,i)
new("value.labels",x@.Data[i], values=x@values[i]))
setAs(from="numeric",to="value.labels",function(from,to){
if(length(names(from))){
if(any(dups <- duplicated(names(from))))
warning("Duplicate labels ",
paste(sQuote(unique(names(from)[dups])),collapse=" "),
call.=FALSE)
if(any(duplicated(from))) warning("Duplicate values",call.=FALSE)
new("value.labels",names(from),values=unname(from))
}
else new("value.labels",character(0),values=logical(0))
})
setAs(from="character",to="value.labels",function(from,to){
if(length(names(from))){
if(any(dups <- duplicated(names(from))))
warning("Duplicate labels",
paste(sQuote(unique(names(from)[dups])),collapse=" "),
call.=FALSE)
if(any(duplicated(from))) warning("Duplicate values",call.=FALSE)
new("value.labels",names(from),values=unname(from))
}
else new("value.labels",character(0),values=logical(0))
})
setAs(from="value.labels",to="numeric",function(from,to)
structure(as.vector(from@values),names=from@.Data)
)
setAs(from="value.labels",to="character",function(from,to)
from@.Data
)
setMethod("as.vector","value.labels",function(x,mode="any")
structure(
as.vector(x@values,mode=mode),
names=x@.Data
)
)
setMethod("Arith",signature(e1="value.labels",e2="ANY"),
function(e1,e2){
if(!is(e2,"value.labels"))
e2 <- as(e2,"value.labels")
vals <- e1@values
labs <- e1@.Data
newvals <- e2@values
newlabs <- e2@.Data
upd.vals <- intersect(vals,newvals)
upd.labs <- newlabs[newvals %in% upd.vals]
tmp <- setdiff(newvals,upd.vals)
newlabs <- newlabs[match(tmp,newvals,nomatch=0L)]
newvals <- tmp
if(.Generic == "+"){
labs <- c(labs[vals %nin% upd.vals],upd.labs,newlabs)
vals <- c(vals[vals %nin% upd.vals],upd.vals,newvals)
ii <- order(vals)
vals <- vals[ii]
labs <- labs[ii]
}
else if(.Generic == "-"){
labs <- labs[vals %nin% upd.vals]
vals <- vals[vals %nin% upd.vals]
ii <- order(vals)
vals <- vals[ii]
labs <- labs[ii]
}
else stop("unsupported operator ",dQuote(.Generic))
new("value.labels",labs,
values = vals)
})
setMethod("has.value.labels","ANY",function(x)FALSE)
setMethod("has.value.labels","item",function(x)length(x@value.labels)>0)
setMethod("is.labelled",signature(x="item.vector"),function(x){
if(!length(x@value.labels)) return(logical(length(x)))
cl <- x@value.labels
x %in% cl@values
})
add_value_labels <- function(x,v){
if(length(labels(x)))
labels(x) <- labels(x) + v
else
labels(x) <- v
x
}
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