R/rbed.R

In pedrodrocha/IRjournalsbr: A R package for scrapping metadata from Braziliam International Relations journals

#' Title
#'
#' @param year
#' @param volume
#' @param number
#' @param silence
#' @param full_text
#'
#' @return
#' @export
#'
#' @examples
rbed <- function(
  year, volume, number, silence = TRUE, full_text = FALSE
) {

  # PART 0: ASSERTIONS
  assert(
    year = year,
    volume = volume,
    number - number,
    silence = silence,
    full_text = full_text
  )
  # PART 1: EDITIONS LINKS

  url_archive <- "https://rbed.abedef.org/rbed/issue/archive"

  url_archive_lido <- xml2::read_html(url_archive)

  url_archive_lido %>%
    rvest::html_nodes("#issues a") %>%
    rvest::html_attr("href") -> primary_url

  url_archive_lido %>%
    rvest::html_nodes("#issues a") %>%
    rvest::html_text()  -> eds

  tibble::tibble(url = primary_url,
                 editions = eds) %>%
    dplyr::mutate(
      vol = stringr::str_extract(editions, "(v. [0-9]{2})|(v. [0-9]{1})") %>%
        stringr::str_replace_all(.,'v. ','') %>%
        as.integer(.),
      n = stringr::str_extract(editions,'n. [0-9]{1}') %>%
        stringr::str_replace_all(.,'n. ','') %>%
        as.integer(.),
      ano = stringr::str_extract(editions,"[0-9]{4}") %>%  as.integer(.),
      url = paste0(url,"/showToc")
    ) %>%
    dplyr::filter(ano %in% year &
                    n %in% number &
                    vol %in% volume) %>%
    dplyr::select(url) %>%
    purrr::flatten_chr() -> primary_url

  # PART II: ARTICLES LINKS

  articles_url <- purrr::map_dfr(primary_url,function(x){

    xml2::read_html(x) %>%
      rvest::html_nodes(".tocTitle a") %>%
      rvest::html_attr("href") -> artigos

    tibble::tibble(links = artigos)
  }) %>%
    purrr::flatten_chr()


  # PART III: SCRAPPING METADATA

  rbed <- purrr::map_dfr(articles_url, function(x){
    if(!isTRUE(silence)) {
      usethis::ui_info(paste0('Currently scrapping: ', x))
    }

    url_lido <- xml2::read_html(x)


    ## A) Filiation

    url_lido %>%
      rvest::html_nodes('meta[name="citation_author_institution"]') %>%
      rvest::html_attr('content') -> filiation

    if (length(filiation) == 0) {
      url_lido %>%
        rvest::html_nodes('.affiliation') %>%
        rvest::html_text() %>%
        stringr::str_remove_all("\\n|\\t") -> filiation
    }

    ## B) Authors

    url_lido %>%
      rvest::html_nodes('meta[name="citation_author"]') %>%
      rvest::html_attr('content') %>%
      stringr::str_trim() -> authors

    if(length(filiation) == 0){
      filiation <- NA
    } else if(length(filiation) != length(authors)) {
      filiation <- NA

    }


    ## C) Title

    url_lido %>%
      rvest::html_node('meta[name="DC.Title"]') %>%
      rvest::html_attr('content') -> title


    ## D) Abstract

    url_lido %>%
      rvest::html_node('meta[name="DC.Description"]') %>%
      rvest::html_attr('content') -> abstract


    if(length(abstract) == 0){abstract <- NA}

    ## E) DOI

    url_lido %>%
      rvest::html_nodes('meta[name="DC.Identifier.DOI"]') %>%
      rvest::html_attr('content') -> doi

    if(length(doi) == 0){ doi <- NA }

    ## F) Pages

    url_lido %>%
      rvest::html_nodes('meta[name="DC.Identifier.pageNumber"]') %>%
      rvest::html_attr('content') -> pages

    if(length(pages) == 0){ pages <- NA }

    ## G) Language

    url_lido %>%
      rvest::html_nodes('meta[name="DC.Language"]') %>%
      rvest::html_attr('content') -> language

    if(length(language) == 0){ language <- NA }

    ## H) Volume

    url_lido %>%
      rvest::html_nodes('meta[name="DC.Source.Volume"]') %>%
      rvest::html_attr('content') -> volume


    ## I) Number

    url_lido %>%
      rvest::html_nodes('meta[name="DC.Source.Issue"]') %>%
      rvest::html_attr('content') -> number


    ## J) Year

    url_lido %>%
      rvest::html_nodes('meta[name="citation_date"]') %>%
      rvest::html_attr('content') %>%
      stringr::str_extract('[0-9]{4}')-> year


    ## K) Keywords

    url_lido %>%
      rvest::html_nodes('meta[name="DC.Subject"]') %>%
      rvest::html_attr('content') %>%
      stringr::str_replace_all(.,'(\\.)|(,)',';') %>%
      paste0(., collapse = '; ')-> keywords




    if(length(keywords) == 0){
      url_lido %>%
        rvest::html_nodes('#articleAbstract p+ p')  %>%
        rvest::html_text() %>%
        stringr::str_to_lower() %>%
        stringr::str_remove('-') %>%
        stringr::str_remove("(palavraschave:)|(keywords:)|(palabrasclave:)") %>%
        stringr::str_squish() %>%
        stringr::str_replace_all(.,'(\\.)|(,)',';')  %>%
        paste0(., collapse = '; ') -> keywords

      if(length(keywords) > 0){
        keywords <- "NA"
      } else if(length(keywords) > 3) {
        keywords <- "NA"
      } else if(keywords == ""){
        keywords <- "NA"
      }


    } else if(keywords == "") {

      url_lido %>%
        rvest::html_nodes('#articleAbstract p+ p')  %>%
        rvest::html_text() %>%
        stringr::str_to_lower() %>%
        stringr::str_remove('-') %>%
        stringr::str_remove("(palavraschave:)|(keywords:)|(palabrasclave:)") %>%
        stringr::str_squish() %>%
        stringr::str_replace_all(.,'(\\.)|(,)',';')  %>%
        paste0(., collapse = '; ')-> keywords


      if(length(keywords) > 0){
        keywords <- "NA"
      } else if(length(keywords) > 3) {
        keywords <- "NA"
      } else if(keywords == ""){
        keywords <- "NA"
      }
    }


    ## L) References
    url_lido %>%
      rvest::html_nodes("#articleCitations p") %>%
      rvest::html_text() %>%
      paste0(.,collapse = "//t") -> references


    if(length(references) == 0){references <- NA}
    else if(references == ""){references <- NA}

    ## M) url_pdf

    url_lido %>%
      rvest::html_nodes('meta[name="citation_pdf_url"]') %>%
      rvest::html_attr('content') -> pdf_url

    if(length(pdf_url) == 0){pdf_url <- ""}


    build_data(
      authors = authors,
      filiation = filiation,
      title = title,
      abstract = abstract,
      keywords = keywords,
      references = references,
      pages = pages,
      year = year,
      volume = volume,
      number = number,
      language = language ,
      doi = doi,
      x = x,
      pdf_url = pdf_url,
      full_text = full_text,
      journal = "Revista Brasileira de Estudos de Defesa",
      issn = '2358-3932'
    )


  })
  rbed %>%
    dplyr::group_by(TI) %>%
    dplyr::mutate(
      AU = stringr::str_c(AU,collapse = ";"),
      OG = stringr::str_c(OG,collapse = ";")
    ) %>%
    dplyr::distinct() %>%
    dplyr::ungroup() %>%
    dplyr::mutate(
      AB = stringr::str_squish(AB)
    )

}