# stolen from httr
is_response <- function (x) { inherits(x, "response") }
"%||%" <- function(a, b) {
if (length(a) > 0) a else b
}
is_path <- function(x) inherits(x, "path")
timestamp <- function(x = Sys.time()) {
format(x, "%Y-%m-%dT%H:%M:%SZ", tz = "UTC")
}
is_installed <- function(pkg) {
system.file(package = pkg) != ""
}
need_package <- function(pkg) {
if (is_installed(pkg)) return(invisible())
stop("Please install ", pkg, " package", call. = FALSE)
}
check_encoding <- function(x) {
if ((tolower(x) %in% tolower(iconvlist())))
return(x)
message("Invalid encoding ", x, ": defaulting to UTF-8.")
"UTF-8"
}
guess_encoding <- function(encoding = NULL, type = NULL) {
if (!is.null(encoding))
return(check_encoding(encoding))
charset <- if (!is.null(type)) httr::parse_media(type)$params$charset
if (is.null(charset)) {
message("No encoding supplied: defaulting to UTF-8.")
return("UTF-8")
}
check_encoding(charset)
}
parse_text <- function(content, type = NULL, encoding = NULL) {
encoding <- guess_encoding(encoding, type)
iconv(readBin(content, character()), from = encoding, to = "UTF-8")
}
parse_query <- function(query) {
params <- vapply(strsplit(query, "&")[[1]], str_split_fixed, "=", 2,
FUN.VALUE = character(2))
values <- as.list(curl::curl_unescape(params[2, ]))
names(values) <- curl::curl_unescape(params[1, ])
values
}
parse_auto <- function(content, type = NULL, encoding = NULL, ...) {
if (length(content) == 0) {
return(NULL)
}
if (is.null(type)) {
stop("Unknown mime type: can't parse automatically. Use the `type` ",
"argument to specify manually.", call. = FALSE)
}
mt <- httr::parse_media(type)
parser <- parsers[[mt$complete]]
if (is.null(parser)) {
stop("No automatic parser available for ", mt$complete, ".",
call. = FALSE)
}
parser(x = content, type = type, encoding = encoding, ...)
}
parseability <- function(type) {
if (is.null(type) || type == "") return("raw")
mt <- httr::parse_media(type)
if (exists(mt$complete, parsers)) {
"parsed"
} else if (mt$type == "text") {
"text"
} else {
"raw"
}
}
parsers <- new.env(parent = emptyenv())
# Binary formats ---------------------------------------------------------------
# http://www.ietf.org/rfc/rfc4627.txt - section 3. (encoding)
parsers$`application/json` <- function(x, type = NULL, encoding = NULL,
simplifyVector = FALSE, ...) {
jsonlite::fromJSON(parse_text(x, encoding = "UTF-8"),
simplifyVector = simplifyVector, ...)
}
parsers$`application/x-www-form-urlencoded` <- function(x, encoding = NULL,
type = NULL, ...) {
parse_query(parse_text(x, encoding = "UTF-8"))
}
# Text formats -----------------------------------------------------------------
parsers$`image/jpeg` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("jpeg")
jpeg::readJPEG(x)
}
parsers$`image/png` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("png")
png::readPNG(x)
}
parsers$`text/plain` <- function(x, type = NULL, encoding = NULL, ...) {
encoding <- guess_encoding(encoding, type)
parse_text(x, type = type, encoding = encoding)
}
parsers$`text/html` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("xml2")
encoding <- guess_encoding(encoding, type)
xml2::read_html(x, encoding = encoding, ...)
}
parsers$`application/xml` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("xml2")
encoding <- guess_encoding(encoding, type)
xml2::read_xml(x, encoding = encoding, ...)
}
parsers$`text/xml` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("xml2")
encoding <- guess_encoding(encoding, type)
xml2::read_xml(x, encoding = encoding, ...)
}
parsers$`text/csv` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("readr")
encoding <- guess_encoding(encoding, type)
readr::read_csv(x, locale = readr::locale(encoding = encoding), ...)
}
parsers$`text/tab-separated-values` <- function(x, type = NULL, encoding = NULL, ...) {
need_package("readr")
encoding <- guess_encoding(encoding, type)
readr::read_tsv(x, locale = readr::locale(encoding = encoding), ...)
}
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