R/body-links.R
In hrbrmstr/urldiversity: Quantify 'URL' Diversity and Apply Popular Biodiversity Indices to a 'URL' Collection
Defines functions
body_anchor_urls
Documented in
body_anchor_urls
#' Extract all body anchor hypertext references
#'
#' Given a valid HTML/XML document, node set or single node, a
#' claracter vector of all `<body>` `<a href>` URLs will be returned.
#' If `base` is not `NULL` all relative URLs will be converted
#' to absolute URLs.
#'
#' @md
#' @param x Either a document, a node set or a single node.
#' @param unique if `TRUE`, then only unique URLs will be returned. Default: `FALSE`.
#' @param base if not `NULL`, all relative URLs will be converted
#' to absolute URLs. Default: `NULL`.
#' @return character vector of extracted URLs; if no `<a>` `href` URLs were discovered
#' `charactrer(0)` will be returned.
#' @export
#' @examples
#' x <- rvest::read_html("https://congress.gov/")
#' body_anchor_urls(x, unique = TRUE, base = "https://congress.gov/")
body_anchor_urls <- function(x, unique = FALSE, base = NULL) {
rvest::html_nodes(x, xpath=".//body//a") %>%
rvest::html_attr("href") -> res
if (length(res) > 0) {
if (unique) res <- unique(res)
if (!is.null(base)) res <- xml2::url_absolute(res, base)
} else {
res <- character(0)
}
res
}
hrbrmstr/urldiversity documentation built on May 14, 2019, 4 a.m.
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Defines functions body_anchor_urls
Documented in body_anchor_urls
#' Extract all body anchor hypertext references
#'
#' Given a valid HTML/XML document, node set or single node, a
#' claracter vector of all `<body>` `<a href>` URLs will be returned.
#' If `base` is not `NULL` all relative URLs will be converted
#' to absolute URLs.
#'
#' @md
#' @param x Either a document, a node set or a single node.
#' @param unique if `TRUE`, then only unique URLs will be returned. Default: `FALSE`.
#' @param base if not `NULL`, all relative URLs will be converted
#' to absolute URLs. Default: `NULL`.
#' @return character vector of extracted URLs; if no `<a>` `href` URLs were discovered
#' `charactrer(0)` will be returned.
#' @export
#' @examples
#' x <- rvest::read_html("https://congress.gov/")
#' body_anchor_urls(x, unique = TRUE, base = "https://congress.gov/")
body_anchor_urls <- function(x, unique = FALSE, base = NULL) {
rvest::html_nodes(x, xpath=".//body//a") %>%
rvest::html_attr("href") -> res
if (length(res) > 0) {
if (unique) res <- unique(res)
if (!is.null(base)) res <- xml2::url_absolute(res, base)
} else {
res <- character(0)
}
res
}
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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