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## A simple span class for storing start and end integer offsets.
## Apache OpenNLP optionally allows storing types in spans: we use
## Annotation objects (with no ids or features) for this.
## Conceptually, a single span is a start/end pair and our Span objects
## are sequences (to allow positional access) of spans, i.e., sequences
## of pairs.
## The implementation actually uses a "pair" (named list of length two)
## of "slots" giving the start and end value sequences.
## Subscripting via [ extracts subsets of spans.
## Subscripting via $ extracts one slot.
Span_slot_names <- c("start", "end")
Span <-
function(start, end)
{
start <- as.integer(start)
end <- as.integer(end)
if(length(start) != length(end))
stop("arguments must have the same length")
.Span_from_args(start, end)
}
.Span_from_args <-
function(start, end)
.Span_from_list(list(start = start, end = end))
.Span_from_list <-
function(x)
{
class(x) <- "Span"
x
}
as.Span <-
function(x)
UseMethod("as.Span")
as.Span.Span <- identity
as.Span.Annotation <-
function(x)
.Span_from_args(x$start, x$end)
is.Span <-
function(x)
inherits(x, "Span")
`[.Span` <-
function(x, i)
.Span_from_list(lapply(unclass(x), `[`, i))
## <TODO>
## Implement eventually ...
`[<-.Span` <-
function(x, i, value)
.NotYetImplemented()
## </TODO>
`[[.Span` <-
function(x, i)
.Span_from_list(lapply(unclass(x), `[[`, i))
## <TODO>
## Implement eventually ...
`[[<-.Span` <-
function(x, i, value)
.NotYetImplemented()
## </TODO>
## $.Span is not really necessary.
`$<-.Span` <-
function(x, name, value)
{
n <- length(x)
x <- unclass(x)
if(is.na(pos <- pmatch(name, Span_slot_names)))
stop("invalid element name")
value <- as.integer(value)
if(length(value) != n)
stop("replacement must have the same length as object")
x[[pos]] <- value
.Span_from_list(x)
}
Ops.Span <-
function(e1, e2)
{
## Allow to add offsets.
switch(as.character(.Generic),
"+" = {
if(is.Span(e1) && is.numeric(e2) && (length(e2) == 1L))
return(Span(e1$start + e2, e1$end + e2))
if(is.Span(e2) && is.numeric(e1) && (length(e1) == 1L))
return(Span(e2$start + e1, e2$end + e1))
stop("Invalid operands.")
},
stop(gettextf("'%s' not defined for \"Span\" objects",
.Generic),
domain = NA))
}
as.data.frame.Span <-
function(x, row.names = NULL, optional = FALSE, ...)
{
data.frame(start = x$start, end = x$end, row.names = row.names)
}
as.list.Span <-
function(x, ...)
lapply(seq_along(x), function(i) x[i])
c.Span <-
function(..., recursive = FALSE)
{
args <- lapply(list(...), function(e) unclass(as.Span(e)))
y <- lapply(Span_slot_names,
function(e) unlist(lapply(args, `[[`, e)))
names(y) <- Span_slot_names
.Span_from_list(y)
}
duplicated.Span <-
function(x, incomparables = FALSE, ...)
{
do.call(`&`, lapply(unclass(x), duplicated))
}
format.Span <-
function(x, ...)
{
format(as.data.frame(x), ...)
}
length.Span <-
function(x)
length(x$start)
names.Span <-
function(x)
NULL
print.Span <-
function(x, ...)
{
print.data.frame(format(x), ..., row.names = FALSE)
invisible(x)
}
unique.Span <-
function(x, incomparables = FALSE, ...)
x[!duplicated(x)]
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