#' S3 Method to get layer
#'
#' @importFrom lattice latticeParseFormula
#' @keywords internal
#' @noRd
#' @examples
#' getLayer(mpg ~ wt, data = mtcars)
#' getLayer('mpg', 'wt', data = mtcars, color = 'cyl')
#' @export
getLayer <- function(x, ...){
UseMethod('getLayer')
}
#' @export
getLayer.formula <- function(x, data, ...){
fml = lattice::latticeParseFormula(x, data = data)
if (length(fml$left.name) > 0){
data[[fml$left.name]] = fml$left
}
data[[fml$right.name]] = fml$right
params_ = modifyList(list(...), list(x = fml$right.name,
y = fml$left.name, data = data, facet = names(fml$condition)
))
fixLayer(params_)
}
#' @export
getLayer.default <- function(x, y, data, ...){
params_ = list(x = x, y = y, data = data, ...)
fixLayer(params_)
}
#' Fix an incomplete layer by adding relevant summaries and modifying the data
#'
#' @keywords internal
#' @noRd
#'
fixLayer <- function(params_){
if (length(params_$y) == 0){
variables = c(params_$x, params_$group)
params_$data = plyr::count(params_$data, variables[variables != ""])
params_$y = 'freq'
}
return(params_)
}
#' @export
tack <- function(x, ...){
UseMethod('tack')
}
#' @export
tack.dimple <- function(x, ...){
x$x = modifyList(x$x, list(...), keep.null=T)
return(x)
}
#' Utility code to return y if x is NULL
#'
#' @keywords internal
#' @noRd
#'
`%||%` <- function(x, y){
if (is.null(x)) y else x
}
#' pipe with magrittr importFrom; uses dplyr technique
#' @importFrom magrittr %>%
#' @name %>%
#' @export
#' @usage lhs \%>\% rhs
NULL
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