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Giorgio Calderolla
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May 22, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| import Foundation | ||
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| private extension XMLNode { | ||
| subscript(xPath: String) -> String? { | ||
| return (try? nodes(forXPath: xPath))?.last?.stringValue | ||
| } | ||
| } | ||
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| private extension Feed { | ||
| /// Try to initialize an episode with the data found in an RSS "item" or Atom "entry" element | ||
| init?(itemNode: XMLNode) { | ||
| // Get the item URL | ||
| guard let urlString = itemNode["@xmlUrl"] else { | ||
| NSLog("Missing feed URL") | ||
| return nil | ||
| } | ||
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| guard let url = URL(string: urlString) else { | ||
| NSLog("Invalid feed URL: \(urlString)") | ||
| return nil | ||
| } | ||
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| // Get the name | ||
| guard let name = itemNode["@title"] ?? itemNode["@text"], name != "" else { | ||
| NSLog("Missing or empty feed title") | ||
| return nil | ||
| } | ||
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| self.name = name | ||
| self.url = url | ||
| } | ||
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| var outlineElement: XMLElement { | ||
| let outlineElement = XMLElement(name: "outline") | ||
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| let titleAttribute = XMLNode(kind: .attribute) | ||
| titleAttribute.name = "title" | ||
| titleAttribute.stringValue = name | ||
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| let textAttribute = XMLNode(kind: .attribute) | ||
| textAttribute.name = "text" | ||
| textAttribute.stringValue = name | ||
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| let typeAttribute = XMLNode(kind: .attribute) | ||
| typeAttribute.name = "type" | ||
| typeAttribute.stringValue = "rss" | ||
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| let xmlURLAttribute = XMLNode(kind: .attribute) | ||
| xmlURLAttribute.name = "xmlUrl" | ||
| xmlURLAttribute.stringValue = url.absoluteString | ||
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| outlineElement.addAttribute(titleAttribute) | ||
| outlineElement.addAttribute(textAttribute) | ||
| outlineElement.addAttribute(typeAttribute) | ||
| outlineElement.addAttribute(xmlURLAttribute) | ||
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| return outlineElement | ||
| } | ||
| } | ||
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| // Parses feeds out of an OPML file. | ||
| struct OPMLParser { | ||
| func parse(opml: Data) throws -> [Feed] { | ||
| NSLog("Parsing OPML file") | ||
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| // Parse xml | ||
| let xml = try XMLDocument(data: opml) | ||
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| // Extract feed item nodes | ||
| let outlineNodes = try xml.nodes(forXPath: "//opml/body//outline") | ||
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| // Extract episodes from NSXMLNodes | ||
| let feeds = outlineNodes.compactMap(Feed.init(itemNode:)) | ||
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| NSLog("Parsed \(feeds.count) feeds") | ||
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| return feeds | ||
| } | ||
| } | ||
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| // Creates an OPML file from feeds. | ||
| struct OPMLSerializer { | ||
| func serialize(feeds: [Feed]) throws -> Data { | ||
| NSLog("Serializing OPML file") | ||
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| let xml = XMLDocument() | ||
| xml.characterEncoding = "utf-8" | ||
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| let opmlElement = XMLElement(name: "opml") | ||
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| let headElement = XMLElement(name: "head") | ||
| let bodyElement = XMLElement(name: "body") | ||
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| let outlineElements = feeds.map(\.outlineElement) | ||
| for outlineElement in outlineElements { | ||
| bodyElement.addChild(outlineElement) | ||
| } | ||
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| opmlElement.addChild(headElement) | ||
| opmlElement.addChild(bodyElement) | ||
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| xml.addChild(opmlElement) | ||
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| return xml.xmlData(options: [.nodeCompactEmptyElement, .nodePrettyPrint]) | ||
| } | ||
| } |
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