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## A simple class for storing tokens and tags ("tagged tokens").
## Conceptually, a single tagged token is a token/tag pair and our
## Tagged_Token objects are sequences (to allow positional access) of
## tagged tokens, i.e., sequences of pairs.
## The implementation actually uses a "pair" (named list of length two)
## of "slots" giving the token and tag sequences.
## Subscripting via [ extracts subsets of tagged tokens.
## Subscripting via $ extracts one slot.
Tagged_Token_slot_names <- c("token", "tag")
Tagged_Token <-
function(token, tag)
{
token <- as.character(token)
tag <- as.character(tag)
if(length(token) != length(tag))
stop("arguments must have the same length")
.Tagged_Token_from_args(token, tag)
}
.Tagged_Token_from_args <-
function(token, tag)
{
x <- list(token, tag)
names(x) <- Tagged_Token_slot_names
.Tagged_Token_from_list(x)
}
.Tagged_Token_from_list <-
function(x)
{
class(x) <- "Tagged_Token"
x
}
as.Tagged_Token <-
function(x)
UseMethod("as.Tagged_Token")
as.Tagged_Token.Tagged_Token <- identity
## <FIXME>
## Should this get a '...'? (And hence the generic, too?)
as.Tagged_Token.TextDocument <-
function(x)
tagged_words(x)
## </FIXME>
is.Tagged_Token <-
function(x)
inherits(x, "Tagged_Token")
`[.Tagged_Token` <-
function(x, i)
.Tagged_Token_from_list(lapply(unclass(x), `[`, i))
## <TODO>
## Implement eventually ...
`[<-.Tagged_Token` <-
function(x, i, value)
.NotYetImplemented()
## </TODO>
`[[.Tagged_Token` <-
function(x, i)
.Tagged_Token_from_list(lapply(unclass(x), `[[`, i))
## <TODO>
## Implement eventually ...
`[[<-.Tagged_Token` <-
function(x, i, value)
.NotYetImplemented()
## </TODO>
## $.Tagged_Token is not really necessary.
`$<-.Tagged_Token` <-
function(x, name, value)
{
n <- length(x)
x <- unclass(x)
if(is.na(pos <- pmatch(name, Tagged_Token_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
.Tagged_Token_from_list(x)
}
as.data.frame.Tagged_Token <-
function(x, row.names = NULL, optional = FALSE, ...)
{
data.frame(token = x$token, tag = x$tag, row.names = row.names)
}
as.list.Tagged_Token <-
function(x, ...)
lapply(seq_along(x), function(i) x[i])
c.Tagged_Token <-
function(..., recursive = FALSE)
{
args <- lapply(list(...), function(e) unclass(as.Tagged_Token(e)))
y <- lapply(Tagged_Token_slot_names,
function(e) unlist(lapply(args, `[[`, e)))
names(y) <- Tagged_Token_slot_names
.Tagged_Token_from_list(y)
}
duplicated.Tagged_Token <-
function(x, incomparables = FALSE, ...)
{
do.call(`&`, lapply(unclass(x), duplicated))
}
format.Tagged_Token <-
function(x, ...)
{
sprintf("%s/%s", x$token, x$tag)
}
length.Tagged_Token <-
function(x)
length(x$token)
names.Tagged_Token <-
function(x)
NULL
## print.Tagged_Token <-
## function(x, ...)
## {
## print(format(x, ...))
## invisible(x)
## }
unique.Tagged_Token <-
function(x, incomparables = FALSE, ...)
x[!duplicated(x)]
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