R/json.R

In crunch: Crunch.io Data Tools

#' @rdname tojson-crunch
#' @export
setMethod("jsonprep", "AbstractCategories", function(x, ...) jsonprep(I(x@.Data)))

#' @rdname tojson-crunch
#' @export
setMethod("jsonprep", "ANY", function(x, ...) {
    if (is.list(x)) {
        ## Do this so that any S3 objects are supported (they are is.list==TRUE
        ## but don't dispatch S3/S4 methods as list)
        x <- lapply(x, jsonprep, ...)
    }
    return(x)
})


.jsonprep.ordergroup <- function(x, ...) {
    ents <- x@entities
    if (length(ents) == 0) {
        ## toJSON(character(0)) is [""], which is length 1 :(
        ents <- list() ## but toJSON(list()) is []
    } else if (is.list(ents)) {
        nested.groups <- vapply(ents, inherits, logical(1),
            what = "OrderGroup"
        )
        ents[nested.groups] <- lapply(ents[nested.groups], .jsonprep.ordergroup)
    }
    return(structure(list(I(ents)), .Names = x@group))
}

#' @rdname tojson-crunch
#' @export
setMethod(
    "jsonprep", "ShojiOrder",
    function(x, ...) jsonprep(list(graph = x@graph, ...))
)

#' @rdname tojson-crunch
#' @export
setMethod("jsonprep", "OrderGroup", .jsonprep.ordergroup)


#' @importFrom jsonlite toJSON
#' @rdname tojson-crunch
#' @export
toJSON <- function(x, ..., for_query_string = FALSE) {
    if (is.null(x)) {
        return(jsonlite::toJSON(emptyObject()))
    }
    x <- jsonprep(x)
    if (for_query_string && envOrOption("crunch.stabilize.query", FALSE, expect_lgl = TRUE)) {
        x <- object_sort(x)
    }

    out <- jsonlite::toJSON(
        x,
        auto_unbox = TRUE, null = "null", na = "null", force = TRUE, ...
    )
    # cat(out)
    return(out)
}


# Adapated from httptest:::object_sort
object_sort <- function(x) {
    if (is.list(x)) {
        if (!is.null(names(x))) {
            x <- x[sort(names(x))]
        }
        return(lapply(x, object_sort))
    }
    x
}