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R/jsonld_to_mustache.R
In dataspice: Create Lightweight Schema.org Descriptions of Data
Defines functions
jsonld_to_mustache
parse_GeoShape_points
parse_GeoShape_box
parse_spatialCoverage
Documented in
jsonld_to_mustache
parse_GeoShape_box
parse_spatialCoverage
#' Parse spatialCoverage section for use in a Leaflet map
#'
#' @param spatialCoverage (list) spatialCoverage section of the JSONLD
#'
#' @return (list) Template-specific variables for Leaflet
parse_spatialCoverage <- function(spatialCoverage) {
json <- list(showmap = "geo" %in% names(spatialCoverage) &&
"type" %in% names(spatialCoverage$geo),
isgeoshape = ifelse(
spatialCoverage$geo$type == "GeoShape",
TRUE,
FALSE),
isgeopoints = ifelse(
spatialCoverage$geo$type == "GeoPoints",
TRUE,
FALSE))
if (json$isgeoshape) {
json <- c(json, parse_GeoShape_box(spatialCoverage$geo$box))
} else if (json$isgeopoints) {
json <- c(json, parse_GeoShape_box(spatialCoverage$geo$points))
} else {
stop("Specified spatialCoverage not supported.", call. = FALSE)
}
json
}
#' Parse spatialCoverage$geo$box section for use in a Leaflet map
#'
#' @param box (list) spatialCoverage$geo$box section of the JSONLD
#'
#' @return (list) Template-specific variables for Leaflet
parse_GeoShape_box <- function(box) {
tokens <- stringr::str_split(box, " ")
if (!length(tokens) == 1) {
stop(
"Failed to parse box in spatialCoverage$geo$box of '",
box, "'.",
call. = FALSE)
}
tokens <- vapply(tokens[[1]], as.numeric, 0.0, USE.NAMES = FALSE)
list(
mapcenterstring =
paste0(
"[",
(tokens[1] + tokens[1] + tokens[3] + tokens[3]) / 4,
", ",
(tokens[2] + tokens[2] + tokens[4] + tokens[4]) / 4,
"]"),
mappolystring =
paste0(
"[",
"[ ", tokens[1], ", ", tokens[2], "], ",
"[ ", tokens[3], ", ", tokens[2], "], ",
"[ ", tokens[3], ", ", tokens[4], "], ",
"[ ", tokens[1], ", ", tokens[4], "]",
"]"))
}
parse_GeoShape_points <- function(points) {
stop("Not implemented.", call. = FALSE)
}
#' Convert JSONLD to a list suitable for Mustache templating
#'
#' @param path (character) Path to file on disk to convert
#'
#' @return (list) Mustache-appropriate list
jsonld_to_mustache <- function(path) {
json <- jsonlite::read_json(path)
# Append the raw JSON+LD to the data so we can insert it into the <head> tag
json$jsonld <- readChar(path, nchars = file.size(path))
# Split keywords from comma-separated to a list
json$keywords <- lapply(
stringr::str_split(json$keywords, ","),
stringr::str_trim)
# Split temporal coverage on the /
tc <- stringr::str_split(json$temporalCoverage, "/")[[1]]
json$beginDate <- tc[1]
json$endDate <- tc[2]
json <- c(json, parse_spatialCoverage(json$spatialCoverage))
json
}
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dataspice documentation built on May 17, 2021, 1:09 a.m.
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Defines functions jsonld_to_mustache parse_GeoShape_points parse_GeoShape_box parse_spatialCoverage
Documented in jsonld_to_mustache parse_GeoShape_box parse_spatialCoverage
#' Parse spatialCoverage section for use in a Leaflet map
#'
#' @param spatialCoverage (list) spatialCoverage section of the JSONLD
#'
#' @return (list) Template-specific variables for Leaflet
parse_spatialCoverage <- function(spatialCoverage) {
json <- list(showmap = "geo" %in% names(spatialCoverage) &&
"type" %in% names(spatialCoverage$geo),
isgeoshape = ifelse(
spatialCoverage$geo$type == "GeoShape",
TRUE,
FALSE),
isgeopoints = ifelse(
spatialCoverage$geo$type == "GeoPoints",
TRUE,
FALSE))
if (json$isgeoshape) {
json <- c(json, parse_GeoShape_box(spatialCoverage$geo$box))
} else if (json$isgeopoints) {
json <- c(json, parse_GeoShape_box(spatialCoverage$geo$points))
} else {
stop("Specified spatialCoverage not supported.", call. = FALSE)
}
json
}
#' Parse spatialCoverage$geo$box section for use in a Leaflet map
#'
#' @param box (list) spatialCoverage$geo$box section of the JSONLD
#'
#' @return (list) Template-specific variables for Leaflet
parse_GeoShape_box <- function(box) {
tokens <- stringr::str_split(box, " ")
if (!length(tokens) == 1) {
stop(
"Failed to parse box in spatialCoverage$geo$box of '",
box, "'.",
call. = FALSE)
}
tokens <- vapply(tokens[[1]], as.numeric, 0.0, USE.NAMES = FALSE)
list(
mapcenterstring =
paste0(
"[",
(tokens[1] + tokens[1] + tokens[3] + tokens[3]) / 4,
", ",
(tokens[2] + tokens[2] + tokens[4] + tokens[4]) / 4,
"]"),
mappolystring =
paste0(
"[",
"[ ", tokens[1], ", ", tokens[2], "], ",
"[ ", tokens[3], ", ", tokens[2], "], ",
"[ ", tokens[3], ", ", tokens[4], "], ",
"[ ", tokens[1], ", ", tokens[4], "]",
"]"))
}
parse_GeoShape_points <- function(points) {
stop("Not implemented.", call. = FALSE)
}
#' Convert JSONLD to a list suitable for Mustache templating
#'
#' @param path (character) Path to file on disk to convert
#'
#' @return (list) Mustache-appropriate list
jsonld_to_mustache <- function(path) {
json <- jsonlite::read_json(path)
# Append the raw JSON+LD to the data so we can insert it into the <head> tag
json$jsonld <- readChar(path, nchars = file.size(path))
# Split keywords from comma-separated to a list
json$keywords <- lapply(
stringr::str_split(json$keywords, ","),
stringr::str_trim)
# Split temporal coverage on the /
tc <- stringr::str_split(json$temporalCoverage, "/")[[1]]
json$beginDate <- tc[1]
json$endDate <- tc[2]
json <- c(json, parse_spatialCoverage(json$spatialCoverage))
json
}
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