Nothing
.slashTerms <- function (x) {
if (!("/" %in% all.names(x)))
return(x)
if (x[[1]] != as.name("/"))
stop("unparseable formula for grouping factor")
list(.slashTerms(x[[2]]), .slashTerms(x[[3]]))
}
## current fns from lme4 for comparison are equivalent
## https://github.com/lme4/lme4/blob/master/R/utilities.R
.makeInteraction <- function(x) {
if (length(x) < 2) return(x)
trm1 <- .makeInteraction(x[[1]])
trm11 <- if(is.list(trm1)) trm1[[1]] else trm1
list(substitute(foo:bar, list(foo=x[[2]], bar = trm11)), trm1)
}
## Create the interaction terms for nested effects
.spMMexpandSlash <- function (bb) {
if (!is.list(bb)) return(.spMMexpandSlash(list(bb)))
#### ELSE :
unlist(lapply(bb, function(x) {
if (length(x) > 2 && is.list(trms <- .slashTerms(x[[3]])))
## lapply(unlist(...)) - unlist returns a flattened list
lapply(unlist(.makeInteraction(trms)),
function(trm) structure(substitute(foo|bar, list(foo = x[[2]], bar = trm)),
type=attr(x,"type") ## replicates the type '(.|.)' of (1|./.) in each of the terms created
))
else x
}))
} ## result is a list of language expresion lhs|rhs each with an attr(."type") as provided by the input bb
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