Nothing
R/utils.R
In rdnb: R Interface to the 'Deutsche Nationalbibliothek (German National Library) API'
Defines functions
print_query
n_rec
dnb_to_df
dnb_parse
dnb_check
dnb_get_url
Documented in
n_rec
print_query
dnb_get_url <- function(path, query, limit, start) {
req <- GET("https://services.dnb.de/", path=path, query=list(version="1.1", operation="searchRetrieve", query=query, maximumRecords=limit, startRecord=start, recordSchema="MARC21-xml"))
dnb_check(req)
if(getOption("rdnb_show_url")) message("Request: ", req$url)
return(req)
}
dnb_check <- function(req) {
if(req$status_code<400) return(invisible())
message <- dnb_parse(req)$message
stop("HTTP failure: ", req$status_code, "\n", message, call.=FALSE)
}
dnb_parse <- function(req) {
xml <- content(req, as="text")
if(identical(xml, "")) stop("Not output to parse", call.=FALSE)
if(length(grep("text/xml", req$headers$'content-type', fixed=TRUE))==0) stop("No XML to parse", call.=FALSE)
parsed <- as_list(read_xml(gsub("\n +", "", xml)))
return(parsed)
}
dnb_to_df <- function(lst, clean) {
# prepare data.frame
nrec <- length(lst$records)
df <- data.frame(matrix(nrow=nrec, ncol=17))
names(df) <- c("id", "link", "author", "title", "subtitle", "publisher", "year", "language", "isbn", "price", "pages", "format", "edition", "keyword", "toc", "description", "cover")
# get data
for(r in 1:nrec) {
rec <- lst$records[[r]]$recordData$record
rec <- setNames(rec, sapply(rec, function(x) attributes(x)$tag))
rec <- lapply(rec, function(x) lapply(x, function(y) setNames(y, attributes(y)$code)))
rec <- lapply(rec, function(x) unlist(x, recursive=FALSE))
if(!is.null(rec[["001"]])) { # id/link
df$id[r] <- rec[["001"]]
df$link[r] <- paste0("https://d-nb.info/", rec[["001"]])
}
if(!is.null(rec[["100"]][["subfield.a"]])) { # author
aut <- rec[["100"]][["subfield.a"]]
if(!is.null(rec[["100"]][["subfield.4"]])) aut <- paste0(aut, " (", rec[["100"]][["subfield.4"]], ")")
df$author[r] <- aut
}
if(length(which(names(rec)=="700"))>0) { # co-author
for(ca in which(names(rec)=="700")) {
if(!is.null(rec[[ca]][["subfield.a"]])) {
coaut <- rec[[ca]][["subfield.a"]]
if(!is.null(rec[[ca]][["subfield.4"]])) coaut <- paste0(coaut, " (", rec[[ca]][["subfield.4"]], ")")
if(is.na(df$author[r])) {
df$author[r] <- coaut
} else {
df$author[r] <- paste(df$author[r], coaut, sep="; ")
}
}
}
}
if(!is.null(rec[["245"]][["subfield.a"]])) { # title
df$title[r] <- rec[["245"]][["subfield.a"]]
}
if(!is.null(rec[["245"]][["subfield.b"]])) { # subtitle
df$subtitle[r] <- rec[["245"]][["subfield.b"]]
}
if(!is.null(rec[["264"]][["subfield.b"]])) { # publisher
pub <- rec[["264"]][["subfield.b"]]
if(!is.null(rec[["264"]][["subfield.a"]])) pub <- paste0(pub, ", ", rec[["264"]][["subfield.a"]])
df$publisher[r] <- pub
}
if(!is.null(rec[["264"]][["subfield.c"]])) { # year
df$year[r] <- rec[["264"]][["subfield.c"]]
} else {
if(!is.null(rec[["008"]])) { # year 2
df$year[r] <- rec[["008"]]
}
}
if(!is.null(rec[["041"]][["subfield.a"]])) { # language
df$language[r] <- rec[["041"]][["subfield.a"]]
}
if(!is.null(rec[["024"]][["subfield.a"]])) { # isbn
df$isbn[r] <- rec[["024"]][["subfield.a"]]
} else if(!is.null(rec[["020"]][["subfield.a"]])) {
df$isbn[r] <- rec[["020"]][["subfield.a"]]
}
if(!is.null(rec[["020"]][["subfield.c"]])) { # price
df$price[r] <- rec[["020"]][["subfield.c"]]
}
if(!is.null(rec[["300"]][["subfield.a"]])) { # pages
df$pages[r] <- rec[["300"]][["subfield.a"]]
}
if(!is.null(rec[["300"]][["subfield.c"]])) { # format
df$format[r] <- rec[["300"]][["subfield.c"]]
}
if(!is.null(rec[["250"]][["subfield.a"]])) { # edition
df$edition[r] <- rec[["250"]][["subfield.a"]]
}
if(length(which(names(rec)=="689"))>0) { # keyword
for(kw in which(names(rec)=="689")) {
if(!is.null(rec[[kw]][["subfield.a"]])) {
if(is.na(df$keyword[r])) {
df$keyword[r] <- rec[[kw]][["subfield.a"]]
} else {
df$keyword[r] <- paste(df$keyword[r], rec[[kw]][["subfield.a"]], sep="; ")
}
}
}
}
if(length(which(names(rec)=="856"))>0) { # toc/description
for(kw in which(names(rec)=="856")) {
if(!is.null(rec[[kw]][["subfield.3"]]) && !is.null(rec[[kw]][["subfield.u"]])) {
if(rec[[kw]][["subfield.3"]]=="Inhaltsverzeichnis") {
df$toc[r] <- rec[[kw]][["subfield.u"]]
} else if(rec[[kw]][["subfield.3"]]=="Inhaltstext") {
df$description[r] <- rec[[kw]][["subfield.u"]]
}
}
}
}
if(!is.null(rec[["020"]][["subfield.9"]])) { # cover
df$cover[r] <- paste0("https://portal.dnb.de/opac/mvb/cover.htm?isbn=", rec[["020"]][["subfield.9"]])
}
}
# clean data
if(clean) {
if(nrow(df)>1) {
df <- as.data.frame(sapply(df, gsub, pattern="\u0098", replacement="", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern="\u009c", replacement="", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern=",,", replacement=",", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern="..", replacement=".", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern=";;", replacement=";", fixed=TRUE), stringsAsFactors=FALSE)
}
df$author <- sapply(df$author, gsub, pattern=" (aut)", replacement="", fixed=TRUE)
df$year <- sapply(df$year, function(x) str_split(x, pattern=" ", n=2)[[1]][1])
df$year <- sapply(df$year, function(x) substr(x, nchar(x)-3, nchar(x)))
df$year <- sapply(df$year, gsub, pattern="[^0-9]", replacement="")
df$year <- as.numeric(df$year)
df$pages <- sapply(df$pages, gsub, pattern=" S.", replacement="", fixed=TRUE)
df$pages <- sapply(df$pages, gsub, pattern=" Seiten", replacement="", fixed=TRUE)
df$pages <- sapply(df$pages, gsub, pattern="[", replacement="", fixed=TRUE)
df$pages <- sapply(df$pages, gsub, pattern="]", replacement="", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="Verl.", replacement="Verlag", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="verl.", replacement="verlag", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="[", replacement="", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="]", replacement="", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Aufl.", replacement="Auflage", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="aufl.", replacement="auflage", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Ed.", replacement="Edition", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="ed.", replacement="edition", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Orig.", replacement="Original", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="korr.", replacement="korrigierte", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Nachdr.", replacement="Nachdruck", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Bibliogr.", replacement="Bibliografie", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="dt.", replacement="deutsche", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Dt.", replacement="Deutsche", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Ver\u00F6ff.", replacement="Ver\u00F6ffentlichung", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="ver\u00F6ff.", replacement="ver\u00F6ffentlichung", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Ausg.", replacement="Ausgabe", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="ausg.", replacement="ausgabe", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Vollst.", replacement="Vollst\u00E4ndige", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="vollst.", replacement="vollst\u00E4ndige", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="\u00DCberarb.", replacement="\u00DCberarbeitete", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="\u00FCberarb.", replacement="\u00FCberarbeitete", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Erw.", replacement="Erweiterte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="erw.", replacement="erweiterte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Erg.", replacement="Erg\u00E4nzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="erg.", replacement="erg\u00E4nzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Ungek.", replacement="Ungek\u00FCrzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="ungek.", replacement="ungek\u00FCrzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Ver\u00E4nd.", replacement="Ver\u00E4nderte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="ver\u00E4nd.", replacement="ver\u00E4nderte", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="[", replacement="", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="]", replacement="", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="1., ", replacement="1. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="2., ", replacement="2. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="3., ", replacement="3. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="4., ", replacement="4. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="5., ", replacement="5. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="6., ", replacement="6. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="7., ", replacement="7. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="8., ", replacement="8. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="9., ", replacement="9. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="10., ", replacement="10. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="11., ", replacement="11. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="12., ", replacement="12. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="13., ", replacement="13. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="14., ", replacement="14. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="15., ", replacement="15. ", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="kart.", replacement="Kartoniert", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="Gb.", replacement="Gebunden", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="Spiralb.", replacement="Spiralbindung", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="Pb.", replacement="Paperback", fixed=TRUE)
}
return(df)
}
#' @title Number of records
#' @description \code{n_rec} returns the number of items in a list of records returned by a DNB-search.
#' @param dnb_obj the DNB-search object returned \code{\link{dnb_search}} or \code{\link{dnb_advanced}}.
#' @return Number of records found.
#' @export
#' @examples
#' \dontrun{
#' dnb.srch <- dnb_search(title="katze")
#' n_rec(dnb.srch)
#' }
n_rec <- function(dnb_obj) {
# check lor and return nrec
if(is.null(attr(dnb_obj, "number_of_records"))) {
return(NULL)
} else {
return(attr(dnb_obj, "number_of_records"))
}
}
#' @title Print search query
#' @description \code{print_query} prints out the query used for a DNB-search request.
#' @param dnb_obj the DNB-serch object returned by \code{\link{dnb_search}} or \code{\link{dnb_advanced}}.
#' @return Query string.
#' @export
#' @examples
#' \dontrun{
#' dnb.srch <- dnb_search(title="katze")
#' print_query(dnb.srch)
#' }
print_query <- function(dnb_obj) {
# check lor and return query
if(is.null(attr(dnb_obj, "query"))) {
return(NULL)
} else {
return(attr(dnb_obj, "query"))
}
}
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Defines functions print_query n_rec dnb_to_df dnb_parse dnb_check dnb_get_url
Documented in n_rec print_query
dnb_get_url <- function(path, query, limit, start) {
req <- GET("https://services.dnb.de/", path=path, query=list(version="1.1", operation="searchRetrieve", query=query, maximumRecords=limit, startRecord=start, recordSchema="MARC21-xml"))
dnb_check(req)
if(getOption("rdnb_show_url")) message("Request: ", req$url)
return(req)
}
dnb_check <- function(req) {
if(req$status_code<400) return(invisible())
message <- dnb_parse(req)$message
stop("HTTP failure: ", req$status_code, "\n", message, call.=FALSE)
}
dnb_parse <- function(req) {
xml <- content(req, as="text")
if(identical(xml, "")) stop("Not output to parse", call.=FALSE)
if(length(grep("text/xml", req$headers$'content-type', fixed=TRUE))==0) stop("No XML to parse", call.=FALSE)
parsed <- as_list(read_xml(gsub("\n +", "", xml)))
return(parsed)
}
dnb_to_df <- function(lst, clean) {
# prepare data.frame
nrec <- length(lst$records)
df <- data.frame(matrix(nrow=nrec, ncol=17))
names(df) <- c("id", "link", "author", "title", "subtitle", "publisher", "year", "language", "isbn", "price", "pages", "format", "edition", "keyword", "toc", "description", "cover")
# get data
for(r in 1:nrec) {
rec <- lst$records[[r]]$recordData$record
rec <- setNames(rec, sapply(rec, function(x) attributes(x)$tag))
rec <- lapply(rec, function(x) lapply(x, function(y) setNames(y, attributes(y)$code)))
rec <- lapply(rec, function(x) unlist(x, recursive=FALSE))
if(!is.null(rec[["001"]])) { # id/link
df$id[r] <- rec[["001"]]
df$link[r] <- paste0("https://d-nb.info/", rec[["001"]])
}
if(!is.null(rec[["100"]][["subfield.a"]])) { # author
aut <- rec[["100"]][["subfield.a"]]
if(!is.null(rec[["100"]][["subfield.4"]])) aut <- paste0(aut, " (", rec[["100"]][["subfield.4"]], ")")
df$author[r] <- aut
}
if(length(which(names(rec)=="700"))>0) { # co-author
for(ca in which(names(rec)=="700")) {
if(!is.null(rec[[ca]][["subfield.a"]])) {
coaut <- rec[[ca]][["subfield.a"]]
if(!is.null(rec[[ca]][["subfield.4"]])) coaut <- paste0(coaut, " (", rec[[ca]][["subfield.4"]], ")")
if(is.na(df$author[r])) {
df$author[r] <- coaut
} else {
df$author[r] <- paste(df$author[r], coaut, sep="; ")
}
}
}
}
if(!is.null(rec[["245"]][["subfield.a"]])) { # title
df$title[r] <- rec[["245"]][["subfield.a"]]
}
if(!is.null(rec[["245"]][["subfield.b"]])) { # subtitle
df$subtitle[r] <- rec[["245"]][["subfield.b"]]
}
if(!is.null(rec[["264"]][["subfield.b"]])) { # publisher
pub <- rec[["264"]][["subfield.b"]]
if(!is.null(rec[["264"]][["subfield.a"]])) pub <- paste0(pub, ", ", rec[["264"]][["subfield.a"]])
df$publisher[r] <- pub
}
if(!is.null(rec[["264"]][["subfield.c"]])) { # year
df$year[r] <- rec[["264"]][["subfield.c"]]
} else {
if(!is.null(rec[["008"]])) { # year 2
df$year[r] <- rec[["008"]]
}
}
if(!is.null(rec[["041"]][["subfield.a"]])) { # language
df$language[r] <- rec[["041"]][["subfield.a"]]
}
if(!is.null(rec[["024"]][["subfield.a"]])) { # isbn
df$isbn[r] <- rec[["024"]][["subfield.a"]]
} else if(!is.null(rec[["020"]][["subfield.a"]])) {
df$isbn[r] <- rec[["020"]][["subfield.a"]]
}
if(!is.null(rec[["020"]][["subfield.c"]])) { # price
df$price[r] <- rec[["020"]][["subfield.c"]]
}
if(!is.null(rec[["300"]][["subfield.a"]])) { # pages
df$pages[r] <- rec[["300"]][["subfield.a"]]
}
if(!is.null(rec[["300"]][["subfield.c"]])) { # format
df$format[r] <- rec[["300"]][["subfield.c"]]
}
if(!is.null(rec[["250"]][["subfield.a"]])) { # edition
df$edition[r] <- rec[["250"]][["subfield.a"]]
}
if(length(which(names(rec)=="689"))>0) { # keyword
for(kw in which(names(rec)=="689")) {
if(!is.null(rec[[kw]][["subfield.a"]])) {
if(is.na(df$keyword[r])) {
df$keyword[r] <- rec[[kw]][["subfield.a"]]
} else {
df$keyword[r] <- paste(df$keyword[r], rec[[kw]][["subfield.a"]], sep="; ")
}
}
}
}
if(length(which(names(rec)=="856"))>0) { # toc/description
for(kw in which(names(rec)=="856")) {
if(!is.null(rec[[kw]][["subfield.3"]]) && !is.null(rec[[kw]][["subfield.u"]])) {
if(rec[[kw]][["subfield.3"]]=="Inhaltsverzeichnis") {
df$toc[r] <- rec[[kw]][["subfield.u"]]
} else if(rec[[kw]][["subfield.3"]]=="Inhaltstext") {
df$description[r] <- rec[[kw]][["subfield.u"]]
}
}
}
}
if(!is.null(rec[["020"]][["subfield.9"]])) { # cover
df$cover[r] <- paste0("https://portal.dnb.de/opac/mvb/cover.htm?isbn=", rec[["020"]][["subfield.9"]])
}
}
# clean data
if(clean) {
if(nrow(df)>1) {
df <- as.data.frame(sapply(df, gsub, pattern="\u0098", replacement="", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern="\u009c", replacement="", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern=",,", replacement=",", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern="..", replacement=".", fixed=TRUE), stringsAsFactors=FALSE)
df <- as.data.frame(sapply(df, gsub, pattern=";;", replacement=";", fixed=TRUE), stringsAsFactors=FALSE)
}
df$author <- sapply(df$author, gsub, pattern=" (aut)", replacement="", fixed=TRUE)
df$year <- sapply(df$year, function(x) str_split(x, pattern=" ", n=2)[[1]][1])
df$year <- sapply(df$year, function(x) substr(x, nchar(x)-3, nchar(x)))
df$year <- sapply(df$year, gsub, pattern="[^0-9]", replacement="")
df$year <- as.numeric(df$year)
df$pages <- sapply(df$pages, gsub, pattern=" S.", replacement="", fixed=TRUE)
df$pages <- sapply(df$pages, gsub, pattern=" Seiten", replacement="", fixed=TRUE)
df$pages <- sapply(df$pages, gsub, pattern="[", replacement="", fixed=TRUE)
df$pages <- sapply(df$pages, gsub, pattern="]", replacement="", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="Verl.", replacement="Verlag", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="verl.", replacement="verlag", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="[", replacement="", fixed=TRUE)
df$publisher <- sapply(df$publisher, gsub, pattern="]", replacement="", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Aufl.", replacement="Auflage", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="aufl.", replacement="auflage", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Ed.", replacement="Edition", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="ed.", replacement="edition", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Orig.", replacement="Original", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="korr.", replacement="korrigierte", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Nachdr.", replacement="Nachdruck", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Bibliogr.", replacement="Bibliografie", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="dt.", replacement="deutsche", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Dt.", replacement="Deutsche", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Ver\u00F6ff.", replacement="Ver\u00F6ffentlichung", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="ver\u00F6ff.", replacement="ver\u00F6ffentlichung", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="Ausg.", replacement="Ausgabe", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="ausg.", replacement="ausgabe", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Vollst.", replacement="Vollst\u00E4ndige", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="vollst.", replacement="vollst\u00E4ndige", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="\u00DCberarb.", replacement="\u00DCberarbeitete", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="\u00FCberarb.", replacement="\u00FCberarbeitete", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Erw.", replacement="Erweiterte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="erw.", replacement="erweiterte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Erg.", replacement="Erg\u00E4nzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="erg.", replacement="erg\u00E4nzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Ungek.", replacement="Ungek\u00FCrzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="ungek.", replacement="ungek\u00FCrzte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="Ver\u00E4nd.", replacement="Ver\u00E4nderte", fixed=TRUE)
#df$edition <- sapply(df$edition, gsub, pattern="ver\u00E4nd.", replacement="ver\u00E4nderte", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="[", replacement="", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="]", replacement="", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="1., ", replacement="1. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="2., ", replacement="2. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="3., ", replacement="3. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="4., ", replacement="4. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="5., ", replacement="5. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="6., ", replacement="6. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="7., ", replacement="7. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="8., ", replacement="8. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="9., ", replacement="9. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="10., ", replacement="10. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="11., ", replacement="11. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="12., ", replacement="12. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="13., ", replacement="13. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="14., ", replacement="14. ", fixed=TRUE)
df$edition <- sapply(df$edition, gsub, pattern="15., ", replacement="15. ", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="kart.", replacement="Kartoniert", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="Gb.", replacement="Gebunden", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="Spiralb.", replacement="Spiralbindung", fixed=TRUE)
df$price <- sapply(df$price, gsub, pattern="Pb.", replacement="Paperback", fixed=TRUE)
}
return(df)
}
#' @title Number of records
#' @description \code{n_rec} returns the number of items in a list of records returned by a DNB-search.
#' @param dnb_obj the DNB-search object returned \code{\link{dnb_search}} or \code{\link{dnb_advanced}}.
#' @return Number of records found.
#' @export
#' @examples
#' \dontrun{
#' dnb.srch <- dnb_search(title="katze")
#' n_rec(dnb.srch)
#' }
n_rec <- function(dnb_obj) {
# check lor and return nrec
if(is.null(attr(dnb_obj, "number_of_records"))) {
return(NULL)
} else {
return(attr(dnb_obj, "number_of_records"))
}
}
#' @title Print search query
#' @description \code{print_query} prints out the query used for a DNB-search request.
#' @param dnb_obj the DNB-serch object returned by \code{\link{dnb_search}} or \code{\link{dnb_advanced}}.
#' @return Query string.
#' @export
#' @examples
#' \dontrun{
#' dnb.srch <- dnb_search(title="katze")
#' print_query(dnb.srch)
#' }
print_query <- function(dnb_obj) {
# check lor and return query
if(is.null(attr(dnb_obj, "query"))) {
return(NULL)
} else {
return(attr(dnb_obj, "query"))
}
}
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