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#' Get list of topics and sub-topics for the Norwegian parliament
#'
#' A function for retrieving topic keys used to label various data from the Norwegian parliament.
#'
#' @usage get_topics(keep_sub_topics = TRUE)
#'
#' @param keep_sub_topics Logical. Whether to keep sub-topics (default) for all main topics or not.
#'
#' @return A list with two elements:
#'
#' 1. **$topics** (All topics)
#'
#' | | |
#' |:------------------|:--------------------------------------------------------|
#' | **response_date** | Date of data retrieval |
#' | **version** | Data version from the API |
#' | **is_main_topic** | Logical indicator for whether the topic is a main topic |
#' | **main_topic_id** | Id of main topic |
#' | **id** | Id of topic |
#' | **name** | Name of topic |
#'
#' 2. **$main_topics** (exclusively main topics, if keep_sub_topics = TRUE)
#'
#' | | |
#' |:------------------|:--------------------------------------------------------|
#' | **response_date** | Date of data retrieval |
#' | **version** | Data version from the API |
#' | **is_main_topic** | Logical indicator for whether the topic is a main topic |
#' | **main_topic_id** | Id of main topic |
#' | **id** | Id of topic |
#' | **name** | Name of topic |
#'
#'
#'
#' @examples
#'
#' # Request the data
#' tops <- get_topics()
#'
#' # Look at the first main topic
#' tops$main_topics[1, ]
#'
#' # Extract all sub-topics for the first main topic
#' tops$topics[which(tops$topics$main_topic_id == 5), ]
#'
#' @import rvest httr
#'
#' @export
#'
get_topics <- function(keep_sub_topics = TRUE){
url <- "https://data.stortinget.no/eksport/emner"
base <- GET(url)
resp <- http_type(base)
if(resp != "text/xml") stop(paste0("Response of ", url, " is not text/xml."), call. = FALSE)
status <- http_status(base)
if(status$category != "Success") stop(paste0("Response of ", url, " returned as '", status$message, "'"), call. = FALSE)
tmp <- read_html(base)
if(keep_sub_topics == TRUE){
tmp <- list(
topics = data.frame(
response_date = tmp %>% html_elements("underemne_liste > emne > respons_dato_tid") %>% html_text(),
version = tmp %>% html_elements("underemne_liste > emne > versjon") %>% html_text(),
is_main_topic = tmp %>% html_elements("underemne_liste > emne > er_hovedemne") %>% html_text(),
main_topic_id = tmp %>% html_elements("underemne_liste > emne > hovedemne_id") %>% html_text(),
id = tmp %>% html_elements("underemne_liste > emne > id") %>% html_text(),
name = tmp %>% html_elements("underemne_liste > emne > navn") %>% html_text()),
main_topics = data.frame(
response_date = tmp %>% html_elements("emne_liste > emne > respons_dato_tid") %>% html_text(),
version = tmp %>% html_elements("emne_liste > emne > versjon") %>% html_text(),
is_main_topic = tmp %>% html_elements("emne_liste > emne > er_hovedemne") %>% html_text(),
main_topic_id = tmp %>% html_elements("emne_liste > emne > hovedemne_id") %>% html_text(),
id = tmp %>% html_elements("emne_liste > emne > id") %>% html_text(),
name = tmp %>% html_elements("emne_liste > emne > navn") %>% html_text())
)
}
if(keep_sub_topics == FALSE){
tmp <- data.frame(
response_date = tmp %>% html_elements("emne_liste > emne > respons_dato_tid") %>% html_text(),
version = tmp %>% html_elements("emne_liste > emne > versjon") %>% html_text(),
is_main_topic = tmp %>% html_elements("emne_liste > emne > er_hovedemne") %>% html_text(),
main_topic_id = tmp %>% html_elements("emne_liste > emne > hovedemne_id") %>% html_text(),
id = tmp %>% html_elements("emne_liste > emne > id") %>% html_text(),
name = tmp %>% html_elements("emne_liste > emne > navn") %>% html_text())
}
return(tmp)
}
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