R/wdclaimcontent.R
In chgrl/rwikidata: R interface to wikidata.org
#' @title Get content of a specific claim
#'
#' @param qid The Wikidata item qid, as string (including the 'Q') or integer value (without the 'Q') - required unless guid is provided
#' @param pid The Wikidata property id, as string (including the 'P') or integer value (without the 'P') - required unless guid is provided
#' @param guid The Wikidata claim guid, as string - required unless qid and pid are provided
#' @param lang Language abbreviation (ISO language codes), as string - default is \code{"en"}
#' @param print Logical - if \code{TRUE} (default) the claim content is printed
#' @param ... Arguments passed to methods, e.g. \code{open.ext} - if \code{TRUE} (default) external sources of the claim like images or URLs are opened
#' @return A list containing meta information of the claim and its content
#' @seealso \code{\link{wdgetclaims}} to get a list of all claims
#' @export
#' @examples
#' \dontrun{
#' wdclaimcontent(qid=144786, pid=17)
#' wdclaimcontent(guid="q144786$258996D0-319A-4A14-971A-6F3326C05ADD") # same same
#'
#' # with qualifiers
#' wdclaimcontent(183, 36)
#'
#' # different content types
#' wdclaimcontent(guid="q206904$26C11CAB-2FEE-4A03-9774-9B70777616B3") # wikidata item
#' wdclaimcontent(guid="q52$61ba10af-455f-021c-19d5-d1a0df4d65f5") # date/time
#' wdclaimcontent(guid="q7186$5675dddd-438d-bd8d-3355-8117747e182d") # string
#' wdclaimcontent(guid="Q206904$920876CE-1C0E-40ED-BB3C-ACB2AC15870C") # url
#' wdclaimcontent(guid="q2280$91220430-4b56-8c53-d75d-ba85ce8a2629") # geocoordinates
#' wdclaimcontent(guid="q144786$25DC2C5E-D59F-4C9B-A307-1DBDF3215576") # commons image
#' zapa.coa <- wdclaimcontent(guid="q144786$25DC2C5E-D59F-4C9B-A307-1DBDF3215576",
#' lang="pl", print=TRUE, open.ext=FALSE)
#' }
wdclaimcontent <- function(qid, pid, guid, lang="en", print=TRUE, ...) {
# prepare request
if(!missing(qid) && !missing(pid) && missing(guid)) {
if(is.numeric(qid)) qid <- paste0("Q", qid)
if(is.numeric(pid)) pid <- paste0("P", pid)
url <- paste0("http://www.wikidata.org/w/api.php?action=wbgetclaims&format=json&entity=", qid, "&property=", pid)
} else if(missing(qid) && missing(pid) && !missing(guid)) url <- paste0("http://www.wikidata.org/w/api.php?action=wbgetclaims&format=json&claim=", guid)
else stop("either qid and pid or guid only required")
# get content
wdcontent <- wdclaimcontent.int(url, lang)
if(print) print(wdcontent, ...)
invisible(wdcontent)
}
#' Internal method to execute API request and process the content
#'
#' @param url API request URL
#' @param lang Language abbreviation (ISO language codes), as string
#' @return A list of guid, item, property, type and content
#' @seealso \code{\link{wdclaimcontent}}
#' @keywords internal
wdclaimcontent.int <- function(url, lang) {
#Retrieve and parse
claim <- query(url, "parsed")
if(length(claim$claims)==0) warning("claim(s) not found")
claim <- claim$claims
n.claims <- length(claim[[1]])
for(cl in 1:n.claims) {
# get info
guid <- claim[[1]][[cl]]$id # if qid and pid given - only first claim, there might be more than one
item <- wdgetitem(strsplit(claim[[1]][[cl]]$id, "$", fixed=TRUE)[[1]][1], lang=lang, print=FALSE)$entities[[1]]$labels[[1]]$value
prop <- wdgetproperty(claim[[1]][[cl]]$mainsnak$property, lang=lang, print=FALSE)[1]
type <- claim[[1]][[cl]]$mainsnak$datatype
# get content
content <- NULL
if(type=="string" || type=="url") { # string
content <- claim[[1]][[cl]]$mainsnak$datavalue$value
} else if(type=="wikibase-item") { # Wikidata item
item.id <- paste0("Q", claim[[1]][[cl]]$mainsnak$datavalue$value$"numeric-id")
item.label <- wdgetitem(item.id, lang, print=FALSE)$entities[[1]]$labels[[1]]$value
content <- c(item.id, item.label)
} else if(type=="time") { # time
time <- claim[[1]][[cl]]$mainsnak$datavalue$value$time
time <- gsub("+", "", time, fixed=TRUE)
time <- gsub("^0+", "", time)
if(substr(time, 1,1)=="-") time <- paste0("0", time)
content <- strptime(strsplit(time, "Z")[[1]][1], "%Y-%m-%dT%H:%M:%S")
} else if(type=="globe-coordinate") { # geographic coordinate
content <- c(claim[[1]][[cl]]$mainsnak$datavalue$value$latitude, claim[[1]][[cl]]$mainsnak$datavalue$value$longitude)
} else if(type=="commonsMedia") { # Wiki commons
file <- claim[[1]][[cl]]$mainsnak$datavalue$value
# get commons website
url <- paste0("http://commons.wikimedia.org/wiki/File:", file, "?uselang=en")
url <- gsub(" ", "%20", url)
web <- query(url, "text")
# get image url
web.list <- strsplit(web, "\n")[[1]]
img.url <- web.list[grep("fullMedia", web.list)]
#<div class=\"fullMedia\"><a href=\"//upload.wikimedia.org/wikipedia/commons/b/ba/Flag_of_Germany.svg\" class=\"internal\" title=\"Flag of Germany.svg\">Original file</a>
img.url <- sub(".*class=\"fullMedia\"><a href=\"", "", img.url)
img.url <- sub("\" class=\"internal\".*", "", img.url)
fname <- tail(strsplit(img.url, "/", fixed=TRUE)[[1]], 1)
# download image and convert to png
download.file(url=paste0("http:", img.url), destfile=file.path(tempdir(), fname))
out <- paste0(file.path(getwd(), head(strsplit(fname, ".", fixed=TRUE)[[1]], -1)), ".png")
# ImageMagick required
if(tolower(tail(strsplit(fname, ".", fixed=TRUE)[[1]], 1))!="png") system(paste("convert", file.path(tempdir(), fname), out))
content <- out
} else if(type=="quantity") { # quantity
amount <- as.numeric(claim[[1]][[cl]]$mainsnak$datavalue$value$amount)
unit <- claim[[1]][[cl]]$mainsnak$datavalue$value$unit
content <- amount
attr(content, "unit") <- unit
}
# qualifiers
qualifiers <- list()
if(!is.null(claim[[1]][[cl]]$qualifiers)) {
qual <- claim[[1]][[cl]]$qualifiers
n.qual <- length(qual)
for(i in 1:n.qual) {
### todo: qualifier might be a list - qualifiers[[i]][[x]]
qual.prop <- wdgetproperty(qual[[i]][[1]]$property, lang=lang, print=FALSE)[1]
qual.type <- qual[[i]][[1]]$datatype
if(!is.null(qual[[i]][[1]]$datavalue)) {
qualifiers[[i]] <- getqualifier(qual[[i]][[1]]$datavalue, qual.type, lang)
names(qualifiers[[i]]) <- gsub(" ", "_", qual.prop, fixed=TRUE)
}
}
}
if(n.claims>1) {
if(cl==1) wdcontent <- list(item=item, property=prop, claims=list())
if(length(qualifiers)==0) wdcontent$claims[[cl]] <- list(guid=guid, type=type, content=content)
else wdcontent$claims[[cl]] <- list(guid=guid, type=type, qualifiers=qualifiers, content=content)
} else {
if(length(qualifiers)==0) wdcontent <- list(guid=guid, item=item, property=prop, type=type, content=content)
else wdcontent <- list(guid=guid, item=item, property=prop, type=type, qualifiers=qualifiers, content=content)
}
}
class(wdcontent) <- "wdclaimcontent"
return(wdcontent)
}
#' Internal method to get and prepare the qualifiers
#'
#' @param qualifier Raw qualifier object
#' @param lang Language abbreviation (ISO language codes), as string
#' @return Qualifier value - object depends on qualifier type
#' @seealso \code{\link{wdclaimcontent.int}}
#' @keywords internal
getqualifier <- function(qualifier, type, lang) {
if(type=="string") {
value <- qualifier$value
attr(value, "type") <- "string"
} else if(type=="time") {
time <- qualifier$value$time
time <- gsub("+", "", time, fixed=TRUE)
time <- gsub("^0+", "", time)
if(substr(time, 1,1)=="-") time <- paste0("0", time)
value <- strptime(strsplit(time, "Z")[[1]][1], "%Y-%m-%dT%H:%M:%S")
attr(value, "type") <- "time"
} else if(type=="quantity") {
value <- as.numeric(qualifier$value$amount)
attr(value, "unit") <- qualifier$value$unit
attr(value, "type") <- "quantity"
} else if(type=="wikibase-item") {
item.id <- paste0("Q", qualifier$value$"numeric-id")
item.label <- wdgetitem(item.id, lang, print=FALSE)$entities[[1]]$labels[[1]]$value
value <- c(item.id, item.label)
attr(value, "type") <- "wikibase-item"
} else if(type=="globe-coordinate") {
value <- c(qualifier$value$latitude, qualifier$value$longitude)
attr(value, "type") <- "globe-coordinate"
} else warning("qualifier not recognized", call.=FALSE)
return(value)
}
#' Print method for wdclaimcontent
#'
#' @param x wdclaimcontent object from \code{\link{wdclaimcontent}}
#' @param open.ext Logical - if \code{TRUE} external sources of the claim like images or URLs are opened
#' @param \dots Arguments to be passed to methods
#' @method print wdclaimcontent
#' @S3method print wdclaimcontent
print.wdclaimcontent <- function(x, open.ext=TRUE, ...) {
cat("\n\tWikidata claim content\n\n")
if(is.null(x$claims)) { # single claim content
cat(paste("GUID:", x$guid, "\n"))
cat(paste("Item:", x$item, "\n"))
cat(paste("Property:", x$property, "\n"))
cat(paste("Type:", x$type, "\n\n"))
# content
if(x$type=="string") {
cat(x$content, "\n")
} else if(x$type=="time") {
cat(as.character(x$content), "\n")
} else if(x$type=="quantity") {
cat(x$content, attr(x$content, "unit"))
} else if(x$type=="url") {
cat(x$content, "\n")
if(open.ext) browseURL(x$content)
} else if(x$type=="wikibase-item") {
cat(x$content[1], "-", x$content[2], "\n")
} else if(x$type=="globe-coordinate") {
cat(x$content[1], ",", x$content[2], "\n", sep="")
if(open.ext && is.numeric(x$content[1]) && is.numeric(x$content[2])) browseURL(paste("http://www.openstreetmap.org/#map=10", x$content[1], content$content[2], sep="/"))
} else if(x$type=="commonsMedia") {
cat("PNG image:", x$content, "\n")
if(open.ext) {
stopifnot(requireNamespace("png", quietly=TRUE))
img <- png::readPNG(x$content)
dim.img <- dim(img)
dev.new(width=5*dim.img[2]/dim.img[1], height=5)
par(mar=c(0,0,0,0))
plot(c(0, dim.img[2]), c(0, dim.img[1]), type="n", xlab="", ylab="")
rasterImage(img, 1, 1, dim.img[2], dim.img[1])
}
}
# qualifiers
if(!is.null(x$qualifiers)) {
for(i in 1:length(x$qualifiers)) cat(paste0(gsub("_", " ", names(x$qualifiers[[i]]), fixed=TRUE), ":"), toString(x$qualifiers[[i]]), "\n")
}
} else { # multiple claim content
cat(paste("Item:", x$item, "\n"))
cat(paste("Property:", x$property, "\n"))
# content
for(i in 1:length(x$claims)) {
cat(paste("\n", i, "\nGUID:", x$claims[[i]]$guid, "\n"))
cat(paste("Type:", x$claims[[i]]$type, "\n"))
if(x$claims[[i]]$type=="string") {
cat(x$claims[[i]]$content, "\n")
} else if(x$claims[[i]]$type=="time") {
cat(as.character(x$claims[[i]]$content), "\n")
} else if(x$claims[[i]]$type=="quantity") {
cat(x$claims[[i]]$content, attr(x$claims[[i]]$content, "unit"))
} else if(x$claims[[i]]$type=="url") {
cat(x$claims[[i]]$content, "\n")
if(open.ext) browseURL(x$claims[[i]]$content)
} else if(x$claims[[i]]$type=="wikibase-item") {
cat(x$claims[[i]]$content[1], "-", x$claims[[i]]$content[2], "\n")
} else if(x$claims[[i]]$type=="globe-coordinate") {
cat(x$claims[[i]]$content[1], ",", x$claims[[i]]$content[2], "\n", sep="")
if(open.ext && is.numeric(x$claims[[i]]$content[1]) && is.numeric(x$claims[[i]]$content[2])) browseURL(paste("http://www.openstreetmap.org/#map=10", x$claims[[i]]$content[1], x$claims[[i]]$content[2], sep="/"))
} else if(x$claims[[i]]$type=="commonsMedia") {
cat("PNG image:", x$claims[[i]]$content, "\n")
if(open.ext) {
stopifnot(requireNamespace("png", quietly=TRUE))
img <- png::readPNG(x$claims[[i]]$content)
dim.img <- dim(img)
dev.new(width=5*dim.img[2]/dim.img[1], height=5)
par(mar=c(0,0,0,0))
plot(c(0, dim.img[2]), c(0, dim.img[1]), type="n", xlab="", ylab="")
rasterImage(img, 1, 1, dim.img[2], dim.img[1])
}
}
# qualifiers
if(!is.null(x$claims[[i]]$qualifiers)) {
for(n in 1:length(x$claims[[i]]$qualifiers)) cat(paste0(gsub("_", " ", names(x$claims[[i]]$qualifiers[[n]]), fixed=TRUE), ":"), toString(x$claims[[i]]$qualifiers[[n]]), "\n")
}
}
}
}
chgrl/rwikidata documentation built on May 13, 2019, 4:08 p.m.
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#' @title Get content of a specific claim
#'
#' @param qid The Wikidata item qid, as string (including the 'Q') or integer value (without the 'Q') - required unless guid is provided
#' @param pid The Wikidata property id, as string (including the 'P') or integer value (without the 'P') - required unless guid is provided
#' @param guid The Wikidata claim guid, as string - required unless qid and pid are provided
#' @param lang Language abbreviation (ISO language codes), as string - default is \code{"en"}
#' @param print Logical - if \code{TRUE} (default) the claim content is printed
#' @param ... Arguments passed to methods, e.g. \code{open.ext} - if \code{TRUE} (default) external sources of the claim like images or URLs are opened
#' @return A list containing meta information of the claim and its content
#' @seealso \code{\link{wdgetclaims}} to get a list of all claims
#' @export
#' @examples
#' \dontrun{
#' wdclaimcontent(qid=144786, pid=17)
#' wdclaimcontent(guid="q144786$258996D0-319A-4A14-971A-6F3326C05ADD") # same same
#'
#' # with qualifiers
#' wdclaimcontent(183, 36)
#'
#' # different content types
#' wdclaimcontent(guid="q206904$26C11CAB-2FEE-4A03-9774-9B70777616B3") # wikidata item
#' wdclaimcontent(guid="q52$61ba10af-455f-021c-19d5-d1a0df4d65f5") # date/time
#' wdclaimcontent(guid="q7186$5675dddd-438d-bd8d-3355-8117747e182d") # string
#' wdclaimcontent(guid="Q206904$920876CE-1C0E-40ED-BB3C-ACB2AC15870C") # url
#' wdclaimcontent(guid="q2280$91220430-4b56-8c53-d75d-ba85ce8a2629") # geocoordinates
#' wdclaimcontent(guid="q144786$25DC2C5E-D59F-4C9B-A307-1DBDF3215576") # commons image
#' zapa.coa <- wdclaimcontent(guid="q144786$25DC2C5E-D59F-4C9B-A307-1DBDF3215576",
#' lang="pl", print=TRUE, open.ext=FALSE)
#' }
wdclaimcontent <- function(qid, pid, guid, lang="en", print=TRUE, ...) {
# prepare request
if(!missing(qid) && !missing(pid) && missing(guid)) {
if(is.numeric(qid)) qid <- paste0("Q", qid)
if(is.numeric(pid)) pid <- paste0("P", pid)
url <- paste0("http://www.wikidata.org/w/api.php?action=wbgetclaims&format=json&entity=", qid, "&property=", pid)
} else if(missing(qid) && missing(pid) && !missing(guid)) url <- paste0("http://www.wikidata.org/w/api.php?action=wbgetclaims&format=json&claim=", guid)
else stop("either qid and pid or guid only required")
# get content
wdcontent <- wdclaimcontent.int(url, lang)
if(print) print(wdcontent, ...)
invisible(wdcontent)
}
#' Internal method to execute API request and process the content
#'
#' @param url API request URL
#' @param lang Language abbreviation (ISO language codes), as string
#' @return A list of guid, item, property, type and content
#' @seealso \code{\link{wdclaimcontent}}
#' @keywords internal
wdclaimcontent.int <- function(url, lang) {
#Retrieve and parse
claim <- query(url, "parsed")
if(length(claim$claims)==0) warning("claim(s) not found")
claim <- claim$claims
n.claims <- length(claim[[1]])
for(cl in 1:n.claims) {
# get info
guid <- claim[[1]][[cl]]$id # if qid and pid given - only first claim, there might be more than one
item <- wdgetitem(strsplit(claim[[1]][[cl]]$id, "$", fixed=TRUE)[[1]][1], lang=lang, print=FALSE)$entities[[1]]$labels[[1]]$value
prop <- wdgetproperty(claim[[1]][[cl]]$mainsnak$property, lang=lang, print=FALSE)[1]
type <- claim[[1]][[cl]]$mainsnak$datatype
# get content
content <- NULL
if(type=="string" || type=="url") { # string
content <- claim[[1]][[cl]]$mainsnak$datavalue$value
} else if(type=="wikibase-item") { # Wikidata item
item.id <- paste0("Q", claim[[1]][[cl]]$mainsnak$datavalue$value$"numeric-id")
item.label <- wdgetitem(item.id, lang, print=FALSE)$entities[[1]]$labels[[1]]$value
content <- c(item.id, item.label)
} else if(type=="time") { # time
time <- claim[[1]][[cl]]$mainsnak$datavalue$value$time
time <- gsub("+", "", time, fixed=TRUE)
time <- gsub("^0+", "", time)
if(substr(time, 1,1)=="-") time <- paste0("0", time)
content <- strptime(strsplit(time, "Z")[[1]][1], "%Y-%m-%dT%H:%M:%S")
} else if(type=="globe-coordinate") { # geographic coordinate
content <- c(claim[[1]][[cl]]$mainsnak$datavalue$value$latitude, claim[[1]][[cl]]$mainsnak$datavalue$value$longitude)
} else if(type=="commonsMedia") { # Wiki commons
file <- claim[[1]][[cl]]$mainsnak$datavalue$value
# get commons website
url <- paste0("http://commons.wikimedia.org/wiki/File:", file, "?uselang=en")
url <- gsub(" ", "%20", url)
web <- query(url, "text")
# get image url
web.list <- strsplit(web, "\n")[[1]]
img.url <- web.list[grep("fullMedia", web.list)]
#<div class=\"fullMedia\"><a href=\"//upload.wikimedia.org/wikipedia/commons/b/ba/Flag_of_Germany.svg\" class=\"internal\" title=\"Flag of Germany.svg\">Original file</a>
img.url <- sub(".*class=\"fullMedia\"><a href=\"", "", img.url)
img.url <- sub("\" class=\"internal\".*", "", img.url)
fname <- tail(strsplit(img.url, "/", fixed=TRUE)[[1]], 1)
# download image and convert to png
download.file(url=paste0("http:", img.url), destfile=file.path(tempdir(), fname))
out <- paste0(file.path(getwd(), head(strsplit(fname, ".", fixed=TRUE)[[1]], -1)), ".png")
# ImageMagick required
if(tolower(tail(strsplit(fname, ".", fixed=TRUE)[[1]], 1))!="png") system(paste("convert", file.path(tempdir(), fname), out))
content <- out
} else if(type=="quantity") { # quantity
amount <- as.numeric(claim[[1]][[cl]]$mainsnak$datavalue$value$amount)
unit <- claim[[1]][[cl]]$mainsnak$datavalue$value$unit
content <- amount
attr(content, "unit") <- unit
}
# qualifiers
qualifiers <- list()
if(!is.null(claim[[1]][[cl]]$qualifiers)) {
qual <- claim[[1]][[cl]]$qualifiers
n.qual <- length(qual)
for(i in 1:n.qual) {
### todo: qualifier might be a list - qualifiers[[i]][[x]]
qual.prop <- wdgetproperty(qual[[i]][[1]]$property, lang=lang, print=FALSE)[1]
qual.type <- qual[[i]][[1]]$datatype
if(!is.null(qual[[i]][[1]]$datavalue)) {
qualifiers[[i]] <- getqualifier(qual[[i]][[1]]$datavalue, qual.type, lang)
names(qualifiers[[i]]) <- gsub(" ", "_", qual.prop, fixed=TRUE)
}
}
}
if(n.claims>1) {
if(cl==1) wdcontent <- list(item=item, property=prop, claims=list())
if(length(qualifiers)==0) wdcontent$claims[[cl]] <- list(guid=guid, type=type, content=content)
else wdcontent$claims[[cl]] <- list(guid=guid, type=type, qualifiers=qualifiers, content=content)
} else {
if(length(qualifiers)==0) wdcontent <- list(guid=guid, item=item, property=prop, type=type, content=content)
else wdcontent <- list(guid=guid, item=item, property=prop, type=type, qualifiers=qualifiers, content=content)
}
}
class(wdcontent) <- "wdclaimcontent"
return(wdcontent)
}
#' Internal method to get and prepare the qualifiers
#'
#' @param qualifier Raw qualifier object
#' @param lang Language abbreviation (ISO language codes), as string
#' @return Qualifier value - object depends on qualifier type
#' @seealso \code{\link{wdclaimcontent.int}}
#' @keywords internal
getqualifier <- function(qualifier, type, lang) {
if(type=="string") {
value <- qualifier$value
attr(value, "type") <- "string"
} else if(type=="time") {
time <- qualifier$value$time
time <- gsub("+", "", time, fixed=TRUE)
time <- gsub("^0+", "", time)
if(substr(time, 1,1)=="-") time <- paste0("0", time)
value <- strptime(strsplit(time, "Z")[[1]][1], "%Y-%m-%dT%H:%M:%S")
attr(value, "type") <- "time"
} else if(type=="quantity") {
value <- as.numeric(qualifier$value$amount)
attr(value, "unit") <- qualifier$value$unit
attr(value, "type") <- "quantity"
} else if(type=="wikibase-item") {
item.id <- paste0("Q", qualifier$value$"numeric-id")
item.label <- wdgetitem(item.id, lang, print=FALSE)$entities[[1]]$labels[[1]]$value
value <- c(item.id, item.label)
attr(value, "type") <- "wikibase-item"
} else if(type=="globe-coordinate") {
value <- c(qualifier$value$latitude, qualifier$value$longitude)
attr(value, "type") <- "globe-coordinate"
} else warning("qualifier not recognized", call.=FALSE)
return(value)
}
#' Print method for wdclaimcontent
#'
#' @param x wdclaimcontent object from \code{\link{wdclaimcontent}}
#' @param open.ext Logical - if \code{TRUE} external sources of the claim like images or URLs are opened
#' @param \dots Arguments to be passed to methods
#' @method print wdclaimcontent
#' @S3method print wdclaimcontent
print.wdclaimcontent <- function(x, open.ext=TRUE, ...) {
cat("\n\tWikidata claim content\n\n")
if(is.null(x$claims)) { # single claim content
cat(paste("GUID:", x$guid, "\n"))
cat(paste("Item:", x$item, "\n"))
cat(paste("Property:", x$property, "\n"))
cat(paste("Type:", x$type, "\n\n"))
# content
if(x$type=="string") {
cat(x$content, "\n")
} else if(x$type=="time") {
cat(as.character(x$content), "\n")
} else if(x$type=="quantity") {
cat(x$content, attr(x$content, "unit"))
} else if(x$type=="url") {
cat(x$content, "\n")
if(open.ext) browseURL(x$content)
} else if(x$type=="wikibase-item") {
cat(x$content[1], "-", x$content[2], "\n")
} else if(x$type=="globe-coordinate") {
cat(x$content[1], ",", x$content[2], "\n", sep="")
if(open.ext && is.numeric(x$content[1]) && is.numeric(x$content[2])) browseURL(paste("http://www.openstreetmap.org/#map=10", x$content[1], content$content[2], sep="/"))
} else if(x$type=="commonsMedia") {
cat("PNG image:", x$content, "\n")
if(open.ext) {
stopifnot(requireNamespace("png", quietly=TRUE))
img <- png::readPNG(x$content)
dim.img <- dim(img)
dev.new(width=5*dim.img[2]/dim.img[1], height=5)
par(mar=c(0,0,0,0))
plot(c(0, dim.img[2]), c(0, dim.img[1]), type="n", xlab="", ylab="")
rasterImage(img, 1, 1, dim.img[2], dim.img[1])
}
}
# qualifiers
if(!is.null(x$qualifiers)) {
for(i in 1:length(x$qualifiers)) cat(paste0(gsub("_", " ", names(x$qualifiers[[i]]), fixed=TRUE), ":"), toString(x$qualifiers[[i]]), "\n")
}
} else { # multiple claim content
cat(paste("Item:", x$item, "\n"))
cat(paste("Property:", x$property, "\n"))
# content
for(i in 1:length(x$claims)) {
cat(paste("\n", i, "\nGUID:", x$claims[[i]]$guid, "\n"))
cat(paste("Type:", x$claims[[i]]$type, "\n"))
if(x$claims[[i]]$type=="string") {
cat(x$claims[[i]]$content, "\n")
} else if(x$claims[[i]]$type=="time") {
cat(as.character(x$claims[[i]]$content), "\n")
} else if(x$claims[[i]]$type=="quantity") {
cat(x$claims[[i]]$content, attr(x$claims[[i]]$content, "unit"))
} else if(x$claims[[i]]$type=="url") {
cat(x$claims[[i]]$content, "\n")
if(open.ext) browseURL(x$claims[[i]]$content)
} else if(x$claims[[i]]$type=="wikibase-item") {
cat(x$claims[[i]]$content[1], "-", x$claims[[i]]$content[2], "\n")
} else if(x$claims[[i]]$type=="globe-coordinate") {
cat(x$claims[[i]]$content[1], ",", x$claims[[i]]$content[2], "\n", sep="")
if(open.ext && is.numeric(x$claims[[i]]$content[1]) && is.numeric(x$claims[[i]]$content[2])) browseURL(paste("http://www.openstreetmap.org/#map=10", x$claims[[i]]$content[1], x$claims[[i]]$content[2], sep="/"))
} else if(x$claims[[i]]$type=="commonsMedia") {
cat("PNG image:", x$claims[[i]]$content, "\n")
if(open.ext) {
stopifnot(requireNamespace("png", quietly=TRUE))
img <- png::readPNG(x$claims[[i]]$content)
dim.img <- dim(img)
dev.new(width=5*dim.img[2]/dim.img[1], height=5)
par(mar=c(0,0,0,0))
plot(c(0, dim.img[2]), c(0, dim.img[1]), type="n", xlab="", ylab="")
rasterImage(img, 1, 1, dim.img[2], dim.img[1])
}
}
# qualifiers
if(!is.null(x$claims[[i]]$qualifiers)) {
for(n in 1:length(x$claims[[i]]$qualifiers)) cat(paste0(gsub("_", " ", names(x$claims[[i]]$qualifiers[[n]]), fixed=TRUE), ":"), toString(x$claims[[i]]$qualifiers[[n]]), "\n")
}
}
}
}
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