Define string constants in JSONFeedParser rather than using literals all over the place. Also: remove a no-longer-needed do/try/catch.
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Brent Simmons
parent
cc3f77571b
commit
de883ce082
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@ -12,39 +12,70 @@ import Foundation
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public struct JSONFeedParser {
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struct Key {
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static let version = "version"
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static let items = "items"
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static let title = "title"
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static let homePageURL = "home_page_url"
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static let feedURL = "feed_url"
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static let feedDescription = "description"
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static let nextURL = "next_url"
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static let icon = "icon"
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static let favicon = "favicon"
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static let expired = "expired"
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static let author = "author"
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static let name = "name"
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static let url = "url"
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static let avatar = "avatar"
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static let hubs = "hubs"
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static let type = "type"
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static let contentHTML = "content_html"
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static let contentText = "content_text"
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static let externalURL = "external_url"
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static let summary = "summary"
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static let image = "image"
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static let bannerImage = "banner_image"
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static let datePublished = "date_published"
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static let dateModified = "date_modified"
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static let tags = "tags"
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static let uniqueID = "id"
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static let attachments = "attachments"
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static let mimeType = "mime_type"
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static let sizeInBytes = "size_in_bytes"
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static let durationInSeconds = "duration_in_seconds"
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}
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static let jsonFeedVersionPrefix = "https://jsonfeed.org/version/"
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public static func parse(_ parserData: ParserData) throws -> ParsedFeed? {
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do {
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guard let parsedObject = try JSONSerialization.jsonObject(with: parserData.data) as? JSONDictionary else {
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throw FeedParserError(.invalidJSON)
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}
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guard let version = parsedObject["version"] as? String, version.hasPrefix("https://jsonfeed.org/version/") else {
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throw FeedParserError(.jsonFeedVersionNotFound)
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}
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guard let itemsArray = parsedObject["items"] as? JSONArray else {
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throw FeedParserError(.jsonFeedItemsNotFound)
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}
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guard let title = parsedObject["title"] as? String else {
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throw FeedParserError(.jsonFeedTitleNotFound)
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}
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let authors = parseAuthors(parsedObject)
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let homePageURL = parsedObject["home_page_url"] as? String
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let feedURL = parsedObject["feed_url"] as? String ?? parserData.url
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let feedDescription = parsedObject["description"] as? String
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let nextURL = parsedObject["next_url"] as? String
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let iconURL = parsedObject["icon"] as? String
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let faviconURL = parsedObject["favicon"] as? String
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let expired = parsedObject["expired"] as? Bool ?? false
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let hubs = parseHubs(parsedObject)
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let items = parseItems(itemsArray, parserData.url)
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return ParsedFeed(type: .jsonFeed, title: title, homePageURL: homePageURL, feedURL: feedURL, feedDescription: feedDescription, nextURL: nextURL, iconURL: iconURL, faviconURL: faviconURL, authors: authors, expired: expired, hubs: hubs, items: items)
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guard let d = JSONUtilities.dictionary(with: parserData.data) else {
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throw FeedParserError(.invalidJSON)
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}
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catch { throw error }
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guard let version = d[Key.version] as? String, version.hasPrefix(JSONFeedParser.jsonFeedVersionPrefix) else {
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throw FeedParserError(.jsonFeedVersionNotFound)
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}
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guard let itemsArray = d[Key.items] as? JSONArray else {
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throw FeedParserError(.jsonFeedItemsNotFound)
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}
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guard let title = d[Key.title] as? String else {
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throw FeedParserError(.jsonFeedTitleNotFound)
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}
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let authors = parseAuthors(d)
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let homePageURL = d[Key.homePageURL] as? String
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let feedURL = d[Key.feedURL] as? String ?? parserData.url
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let feedDescription = d[Key.feedDescription] as? String
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let nextURL = d[Key.nextURL] as? String
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let iconURL = d[Key.icon] as? String
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let faviconURL = d[Key.favicon] as? String
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let expired = d[Key.expired] as? Bool ?? false
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let hubs = parseHubs(d)
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let items = parseItems(itemsArray, parserData.url)
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return ParsedFeed(type: .jsonFeed, title: title, homePageURL: homePageURL, feedURL: feedURL, feedDescription: feedDescription, nextURL: nextURL, iconURL: iconURL, faviconURL: faviconURL, authors: authors, expired: expired, hubs: hubs, items: items)
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}
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}
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@ -52,13 +83,13 @@ private extension JSONFeedParser {
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static func parseAuthors(_ dictionary: JSONDictionary) -> Set<ParsedAuthor>? {
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guard let authorDictionary = dictionary["author"] as? JSONDictionary else {
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guard let authorDictionary = dictionary[Key.author] as? JSONDictionary else {
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return nil
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}
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let name = authorDictionary["name"] as? String
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let url = authorDictionary["url"] as? String
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let avatar = authorDictionary["avatar"] as? String
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let name = authorDictionary[Key.name] as? String
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let url = authorDictionary[Key.url] as? String
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let avatar = authorDictionary[Key.avatar] as? String
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if name == nil && url == nil && avatar == nil {
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return nil
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}
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@ -68,12 +99,12 @@ private extension JSONFeedParser {
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static func parseHubs(_ dictionary: JSONDictionary) -> Set<ParsedHub>? {
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guard let hubsArray = dictionary["hubs"] as? JSONArray else {
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guard let hubsArray = dictionary[Key.hubs] as? JSONArray else {
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return nil
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}
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let hubs = hubsArray.flatMap { (hubDictionary) -> ParsedHub? in
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guard let hubURL = hubDictionary["url"] as? String, let hubType = hubDictionary["type"] as? String else {
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guard let hubURL = hubDictionary[Key.url] as? String, let hubType = hubDictionary[Key.type] as? String else {
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return nil
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}
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return ParsedHub(type: hubType, url: hubURL)
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@ -94,26 +125,26 @@ private extension JSONFeedParser {
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return nil
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}
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let contentHTML = itemDictionary["content_html"] as? String
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let contentText = itemDictionary["content_text"] as? String
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let contentHTML = itemDictionary[Key.contentHTML] as? String
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let contentText = itemDictionary[Key.contentText] as? String
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if contentHTML == nil && contentText == nil {
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return nil
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}
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let decodedContentHTML = contentHTML?.rsparser_stringByDecodingHTMLEntities()
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let url = itemDictionary["url"] as? String
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let externalURL = itemDictionary["external_url"] as? String
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let title = itemDictionary["title"] as? String
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let summary = itemDictionary["summary"] as? String
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let imageURL = itemDictionary["image"] as? String
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let bannerImageURL = itemDictionary["banner_image"] as? String
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let url = itemDictionary[Key.url] as? String
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let externalURL = itemDictionary[Key.externalURL] as? String
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let title = itemDictionary[Key.title] as? String
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let summary = itemDictionary[Key.summary] as? String
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let imageURL = itemDictionary[Key.image] as? String
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let bannerImageURL = itemDictionary[Key.bannerImage] as? String
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let datePublished = parseDate(itemDictionary["date_published"] as? String)
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let dateModified = parseDate(itemDictionary["date_modified"] as? String)
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let datePublished = parseDate(itemDictionary[Key.datePublished] as? String)
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let dateModified = parseDate(itemDictionary[Key.dateModified] as? String)
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let authors = parseAuthors(itemDictionary)
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var tags: Set<String>? = nil
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if let tagsArray = itemDictionary["tags"] as? [String] {
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if let tagsArray = itemDictionary[Key.tags] as? [String] {
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tags = Set(tagsArray)
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}
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let attachments = parseAttachments(itemDictionary)
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@ -123,14 +154,14 @@ private extension JSONFeedParser {
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static func parseUniqueID(_ itemDictionary: JSONDictionary) -> String? {
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if let uniqueID = itemDictionary["id"] as? String {
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if let uniqueID = itemDictionary[Key.uniqueID] as? String {
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return uniqueID // Spec says it must be a string
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}
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// Spec also says that if it’s a number, even though that’s incorrect, it should be coerced to a string.
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if let uniqueID = itemDictionary["id"] as? Int {
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if let uniqueID = itemDictionary[Key.uniqueID] as? Int {
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return "\(uniqueID)"
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}
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if let uniqueID = itemDictionary["id"] as? Double {
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if let uniqueID = itemDictionary[Key.uniqueID] as? Double {
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return "\(uniqueID)"
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}
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return nil
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@ -146,7 +177,7 @@ private extension JSONFeedParser {
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static func parseAttachments(_ itemDictionary: JSONDictionary) -> Set<ParsedAttachment>? {
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guard let attachmentsArray = itemDictionary["attachments"] as? JSONArray else {
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guard let attachmentsArray = itemDictionary[Key.attachments] as? JSONArray else {
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return nil
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}
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return Set(attachmentsArray.flatMap { parseAttachment($0) })
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@ -154,16 +185,16 @@ private extension JSONFeedParser {
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static func parseAttachment(_ attachmentObject: JSONDictionary) -> ParsedAttachment? {
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guard let url = attachmentObject["url"] as? String else {
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guard let url = attachmentObject[Key.url] as? String else {
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return nil
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}
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guard let mimeType = attachmentObject["mime_type"] as? String else {
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guard let mimeType = attachmentObject[Key.mimeType] as? String else {
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return nil
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}
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let title = attachmentObject["title"] as? String
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let sizeInBytes = attachmentObject["size_in_bytes"] as? Int
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let durationInSeconds = attachmentObject["duration_in_seconds"] as? Int
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let title = attachmentObject[Key.title] as? String
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let sizeInBytes = attachmentObject[Key.sizeInBytes] as? Int
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let durationInSeconds = attachmentObject[Key.durationInSeconds] as? Int
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return ParsedAttachment(url: url, mimeType: mimeType, title: title, sizeInBytes: sizeInBytes, durationInSeconds: durationInSeconds)
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}
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