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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 reset(with data: Data) {
posts.removeAll()
currentPost = nil
currentPostData.removeAll()
currentElementName = nil
currentText = ""
parser = XMLParser(data: data)
parser.delegate = self
}
func parse() -> [BooruPost] {
parser.parse()
return posts
}
private func makePost(from dict: [String: String]) -> BooruPost? {
guard let id = dict["id"],
let score = dict["score"],
let parentId = dict["parent_id"],
let rating = dict["rating"],
let tagsString = dict["tags"],
let change = dict["change"],
let md5 = dict["md5"],
let creatorId = dict["creator_id"],
let createdAtString = dict["created_at"],
let status = dict["status"],
let source = dict["source"]
else {
return nil
}
guard let height = Int(dict["height"] ?? ""),
let sampleWidth = Int(dict["sample_width"] ?? ""),
let sampleHeight = Int(dict["sample_height"] ?? ""),
let width = Int(dict["width"] ?? ""),
let previewWidth = Int(dict["preview_width"] ?? ""),
let previewHeight = Int(dict["preview_height"] ?? "")
else {
return nil
}
guard let fileUrl = URL(string: dict["file_url"] ?? ""),
let sampleUrl = URL(string: dict["sample_url"] ?? ""),
let previewUrl = URL(string: dict["preview_url"] ?? ""),
let createdAt = parseCreatedAt(createdAtString)
else {
return nil
}
let tags = tagsString.components(separatedBy: .whitespacesAndNewlines)
.filter { !$0.isEmpty }
return BooruPost(
id: id,
height: height,
score: score,
fileURL: fileUrl,
parentID: parentId,
sampleURL: sampleUrl,
sampleWidth: sampleWidth,
sampleHeight: sampleHeight,
previewURL: previewUrl,
rating: BooruRating(rating),
tags: tags,
width: width,
change: change,
md5: md5,
creatorID: creatorId,
authorID: dict["author_id"],
createdAt: createdAt,
status: status,
source: source,
previewWidth: previewWidth,
previewHeight: previewHeight
)
}
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" {
if let post = makePost(from: attributeDict) {
currentPost = post
}
}
}
}
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" {
if let post = makePost(from: currentPostData) {
posts.append(post)
}
} 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: Error) {
print("BooruPostXMLParser.parser: \(parseError)")
}
#endif
private static let dateFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "EEE MMM dd HH:mm:ss Z yyyy"
formatter.locale = Locale(identifier: "en_US_POSIX")
return formatter
}()
func parseCreatedAt(_ input: String) -> Date? {
if let date = Self.dateFormatter.date(from: input) {
return date
}
if let timestamp = Double(input) {
return Date(timeIntervalSince1970: timestamp)
}
return nil
}
}
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