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import Foundation
class BooruPostXMLParser: NSObject, XMLParserDelegate {
private var posts: [BooruPost] = []
private var currentPost: BooruPost?
private var parser: XMLParser
private let provider: BooruProvider
private var currentPostData: [String: String] = [:]
private var currentElementName: String?
private var currentText: String = ""
init(data: Data, provider: BooruProvider) {
parser = XMLParser(data: data)
self.provider = provider
super.init()
parser.delegate = self
}
func parse() -> [BooruPost] {
parser.parse()
return posts
}
func parser(
_ parser: XMLParser, // swiftlint:disable:this unused_parameter
didStartElement elementName: String,
namespaceURI: String?, // swiftlint:disable:this unused_parameter
qualifiedName qName: String?, // swiftlint:disable:this unused_parameter
attributes attributeDict: [String: String] = [:]
) {
if provider == .gelbooru {
if elementName == "post" {
currentPostData = [:]
} else {
currentElementName = elementName
currentText = ""
}
} else {
if elementName == "post" {
guard let id = attributeDict["id"],
let heightStr = attributeDict["height"],
let height = Int(heightStr),
let score = attributeDict["score"],
let fileUrl = attributeDict["file_url"],
let parentId = attributeDict["parent_id"],
let sampleUrl = attributeDict["sample_url"],
let sampleWidthStr = attributeDict["sample_width"],
let sampleWidth = Int(sampleWidthStr),
let sampleHeightStr = attributeDict["sample_height"],
let sampleHeight = Int(sampleHeightStr),
let previewUrl = attributeDict["preview_url"],
let rating = attributeDict["rating"],
let tags = attributeDict["tags"],
let widthStr = attributeDict["width"],
let width = Int(widthStr),
let change = attributeDict["change"],
let md5 = attributeDict["md5"],
let creatorId = attributeDict["creator_id"],
let createdAt = attributeDict["created_at"],
let status = attributeDict["status"],
let source = attributeDict["source"],
let previewWidthStr = attributeDict["preview_width"],
let previewWidth = Int(previewWidthStr),
let previewHeightStr = attributeDict["preview_height"],
let previewHeight = Int(previewHeightStr)
else {
return
}
currentPost = BooruPost(
id: id,
height: height,
score: score,
fileURL: URL(string: fileUrl)!,
parentID: parentId,
sampleURL: URL(string: sampleUrl)!,
sampleWidth: sampleWidth,
sampleHeight: sampleHeight,
previewURL: URL(string: previewUrl)!,
rating: BooruRating(rating),
tags: tags.components(separatedBy: " ").filter { !$0.isEmpty },
width: width,
change: change,
md5: md5,
creatorID: creatorId,
authorID: attributeDict["author_id"],
createdAt: parseCreatedAt(createdAt)!,
status: status,
source: source,
previewWidth: previewWidth,
previewHeight: previewHeight
)
}
}
}
func parser(
_ parser: XMLParser, // swiftlint:disable:this unused_parameter
foundCharacters string: String
) {
if provider == .gelbooru, currentElementName != nil {
currentText += string
}
}
func parser(
_ parser: XMLParser, // swiftlint:disable:this unused_parameter
didEndElement elementName: String,
namespaceURI: String?, // swiftlint:disable:this unused_parameter
qualifiedName qName: String? // swiftlint:disable:this unused_parameter
) {
if provider == .gelbooru {
if elementName == "post" {
guard let id = currentPostData["id"],
let heightStr = currentPostData["height"],
let height = Int(heightStr),
let score = currentPostData["score"],
let fileUrlStr = currentPostData["file_url"],
let fileUrl = URL(string: fileUrlStr),
let parentId = currentPostData["parent_id"],
let sampleUrlStr = currentPostData["sample_url"],
let sampleUrl = URL(string: sampleUrlStr),
let sampleWidthStr = currentPostData["sample_width"],
let sampleWidth = Int(sampleWidthStr),
let sampleHeightStr = currentPostData["sample_height"],
let sampleHeight = Int(sampleHeightStr),
let previewUrlStr = currentPostData["preview_url"],
let previewUrl = URL(string: previewUrlStr),
let rating = currentPostData["rating"],
let tagsString = currentPostData["tags"],
let widthStr = currentPostData["width"],
let width = Int(widthStr),
let change = currentPostData["change"],
let md5 = currentPostData["md5"],
let creatorId = currentPostData["creator_id"],
let createdAtStr = currentPostData["created_at"],
let createdAt = parseCreatedAt(createdAtStr),
let status = currentPostData["status"],
let source = currentPostData["source"],
let previewWidthStr = currentPostData["preview_width"],
let previewWidth = Int(previewWidthStr),
let previewHeightStr = currentPostData["preview_height"],
let previewHeight = Int(previewHeightStr)
else {
return
}
posts.append(
BooruPost(
id: id,
height: height,
score: score,
fileURL: fileUrl,
parentID: parentId,
sampleURL: sampleUrl,
sampleWidth: sampleWidth,
sampleHeight: sampleHeight,
previewURL: previewUrl,
rating: BooruRating(rating),
tags: tagsString.components(separatedBy: CharacterSet.whitespacesAndNewlines)
.filter { !$0.isEmpty },
width: width,
change: change,
md5: md5,
creatorID: creatorId,
authorID: currentPostData["author_id"],
createdAt: createdAt,
status: status,
source: source,
previewWidth: previewWidth,
previewHeight: previewHeight
)
)
} else if let currentElement = currentElementName {
currentPostData[currentElement] = currentText.trimmingCharacters(
in: .whitespacesAndNewlines
)
currentElementName = nil
currentText = ""
}
} else {
if elementName == "post", let post = currentPost {
posts.append(post)
currentPost = nil
}
}
}
#if DEBUG
func parser(_: XMLParser, parseErrorOccurred parseError: any Error) {
print("parser: \(parseError)")
}
#endif
func parseCreatedAt(_ input: String) -> Date? {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEE MMM dd HH:mm:ss Z yyyy"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
if let date = dateFormatter.date(from: input) {
return date
}
if let timestamp = Double(input) {
return Date(timeIntervalSince1970: timestamp)
}
return nil
}
}
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