120 lines
3.3 KiB
Swift
120 lines
3.3 KiB
Swift
import Foundation
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protocol LanguageIdentifiable {
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var languageIdentifier: String { get }
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var title: String { get }
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}
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protocol LanguageContainer {
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associatedtype LocalizedContainer: LanguageIdentifiable
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var languages: [LocalizedContainer] { get }
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}
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protocol LocalizedMetadataContainer {
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associatedtype MetadataType: LanguageContainer
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var metadata: MetadataType { get }
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func hasContent(for language: String) -> Bool
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}
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// MARK: Default implementations
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extension LocalizedMetadataContainer {
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func hasContent(for language: String) -> Bool {
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true
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}
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}
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// MARK: Extensions
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extension LocalizedMetadataContainer {
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func localized(for language: String) -> MetadataType.LocalizedContainer {
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metadata.localized(for: language)
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}
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/**
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The localized title of the element.
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This title is used as large text in overview pages, or as the `<h1>` title on pages. If no separate link preview title is specified using a localized `linkPreview.title`, then this value is also used for link previews.
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*/
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func title(for language: String) -> String {
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localized(for: language).title
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}
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func nextLanguage(for languageIdentifier: String) -> String? {
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let langs = metadata.languages.map { $0.languageIdentifier }
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guard let index = langs.firstIndex(of: languageIdentifier) else {
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return nil
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}
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for i in 1..<langs.count {
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let next = langs[(index + i) % langs.count]
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guard hasContent(for: next) else {
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continue
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}
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guard next != languageIdentifier else {
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return nil
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}
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return next
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}
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return nil
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}
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}
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extension LanguageContainer {
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var languageIdentifiers: [String] {
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languages.map { $0.languageIdentifier }
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}
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#warning("Throw better error for missing language")
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func localized(for language: String) -> LocalizedContainer {
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languages.first { $0.languageIdentifier == language }!
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}
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/**
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The localized title of the element.
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This title is used as large text in overview pages, or as the `<h1>` title on pages. If no separate link preview title is specified using a localized `linkPreview.title`, then this value is also used for link previews.
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*/
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func title(for language: String) -> String {
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localized(for: language).title
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}
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}
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extension LocalizedMetadataContainer where Self: SiteElement, Self.MetadataType.LocalizedContainer: LinkPreviewMetadataProvider {
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private func linkPreviewImageFileName(for language: String) -> String? {
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if let fileName = localized(for: language).linkPreview?.image {
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return fileName
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}
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// Check for the existence of a localized thumbnail
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let fileName = Self.thumbnailFileNameLocalized(for: language)
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if inputFolder.appendingPathComponent(fileName).exists {
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return fileName
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}
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let defaultThumbnail = Self.defaultThumbnailFileName
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if inputFolder.appendingPathComponent(defaultThumbnail).exists {
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return defaultThumbnail
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}
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return nil
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}
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func linkPreviewImage(for language: String) -> String? {
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guard let fileName = linkPreviewImageFileName(for: language) else {
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return nil
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}
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return "/\(path)/\(fileName)"
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}
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}
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