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## We want data frame methods that support calls like xyplot(data,
## formula, ...) by calling them as xyplot(formula, data, ...). This
## is a little tricky (in ways that I don't really understand) because
## of the need to handle NSE arguments like groups and subset.
## Here we _know_ that the first argument (or a named argument 'x') is
## a data.frame. We will try to identify the 'x' and 'formula'
## arguments, which may or may not be named, remove them (along with a
## 'data' argument if any), rename them to 'data' and 'x'
## respectively, and evaluate the call.
.df2formula <- function(ccall)
{
ocall <- ccall
n <- length(ccall)
if (n == 2) stop("a formula must be specified for the 'data.frame' method")
cnames <- names(ccall)
if (is.null(cnames)) {
## No named arguments --- this is relatively easy
if (n == 3) names(ccall) <- c("", "data", "x")
else if (n > 3) {
## third argument is 'formula', and second argument 'data'
## is to be ignored
ccall <- ccall[-3L] # second argument has index 3
names(ccall) <- rep("", n-1) # second argument is now the formula
names(ccall)[c(2, 3)] <- c("data", "x")
}
}
else {
## OK, we have names (so at least one named argument). Let's
## check how many unnamed arguments we have (excluding the
## function name), how many of 'x', 'data', and 'formula' are
## still missing, and match them accordingly
w <- which(cnames[-1] == ""); nw <- length(w)
have_args <- c("x", "data", "formula") %in% cnames
need_match <- c("x", "data", "formula")[!have_args]
nmatch <- min(nw, length(need_match))
if (nmatch > 0) { # match with missing args
names(ccall)[ w[1:nmatch] + 1L ] <- need_match[1:nmatch]
}
## We should be ready now to switch argument names and
## call. We assume that we have at least 'x' and either or
## both of 'data' and 'formula'
formula <- if (is.null(ccall$formula)) ccall$data
else ccall$formula
## The next line is highly questionable, but is needed to
## handle cases like
## xyplot(data, data = y ~ x, , col = 1)
## although it's not clear whether they need to be
if (missing(formula)) formula <- ccall$data
x <- ccall$x
ccall$formula <- NULL # in case present
ccall$x <- formula # switch
ccall$data <- x
}
if (!inherits(eval(ccall$x), "formula")) stop("'formula' must be a formula object")
ans <- eval.parent(ccall)
ans$call <- ocall
ans
}
dotplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(dotplot)
.df2formula(ocall)
}
barchart.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(barchart)
.df2formula(ocall)
}
stripplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(stripplot)
.df2formula(ocall)
}
bwplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(bwplot)
.df2formula(ocall)
}
wireframe.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(wireframe)
.df2formula(ocall)
}
cloud.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(cloud)
.df2formula(ocall)
}
densityplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(densityplot)
.df2formula(ocall)
}
histogram.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(histogram)
.df2formula(ocall)
}
contourplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(contourplot)
.df2formula(ocall)
}
levelplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(levelplot)
.df2formula(ocall)
}
qq.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(qq)
.df2formula(ocall)
}
qqmath.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(qqmath)
.df2formula(ocall)
}
tmd.data.frame <- function(object, formula, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(tmd)
if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
modifyList(tmd(formula, object, ...), list(call = ocall))
}
xyplot.data.frame <- function(x, data = NULL, formula = data, ...)
{
ocall <- sys.call(); ocall[[1]] <- quote(xyplot)
.df2formula(ocall)
}
## barchart.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(barchart)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(barchart(formula, x, ...), list(call = ocall))
## }
## stripplot.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(stripplot)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(stripplot(formula, x, ...), list(call = ocall))
## }
## bwplot.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(bwplot)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(bwplot(formula, x, ...), list(call = ocall))
## }
## wireframe.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(wireframe)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(wireframe(formula, x, ...), list(call = ocall))
## }
## cloud.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(cloud)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(cloud(formula, x, ...), list(call = ocall))
## }
## densityplot.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(densityplot)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(densityplot(formula, x, ...), list(call = ocall))
## }
## histogram.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(histogram)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(histogram(formula, x, ...), list(call = ocall))
## }
## contourplot.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(contourplot)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(contourplot(formula, x, ...), list(call = ocall))
## }
## levelplot.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(levelplot)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(levelplot(formula, x, ...), list(call = ocall))
## }
## qq.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(qq)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(qq(formula, x, ...), list(call = ocall))
## }
## qqmath.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(qqmath)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(qqmath(formula, x, ...), list(call = ocall))
## }
## tmd.data.frame <- function(object, formula, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(tmd)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(tmd(formula, object, ...), list(call = ocall))
## }
## xyplot.data.frame <- function(x, data = NULL, formula = data, ...)
## {
## ocall <- sys.call(); ocall[[1]] <- quote(xyplot)
## if (!inherits(formula, "formula")) stop("'formula' must be a formula object")
## modifyList(xyplot(formula, x, ...), list(call = ocall))
## }
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