File: TopicsVisualStyle.swift

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/*
 This source file is part of the Swift.org open source project

 Copyright (c) 2022-2023 Apple Inc. and the Swift project authors
 Licensed under Apache License v2.0 with Runtime Library Exception

 See https://swift.org/LICENSE.txt for license information
 See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/

import Foundation
import Markdown

/// A directive for specifying the style that should be used when rendering a page's
/// Topics section.
public class TopicsVisualStyle: Semantic, AutomaticDirectiveConvertible {
    public static let introducedVersion = "5.8"
    public let originalMarkup: BlockDirective
    
    /// The specified style that should be used when rendering a page's Topics section.
    @DirectiveArgumentWrapped(name: .unnamed)
    public private(set) var style: Style
    
    /// A visual style for a page's Topics section.
    public enum Style: String, CaseIterable, DirectiveArgumentValueConvertible {
        /// A list of the page's topics, including their full declaration and abstract.
        case list
        
        /// A grid of items based on the card image for each page.
        ///
        /// Includes each page’s title and card image but excludes their abstracts.
        case compactGrid
        
        /// A grid of items based on the card image for each page.
        ///
        /// Unlike ``compactGrid``, this style includes the abstract for each page.
        case detailedGrid
        
        /// Do not show child pages anywhere on the page.
        case hidden
    }
    
    static var keyPaths: [String : AnyKeyPath] = [
        "style"  : \TopicsVisualStyle._style,
    ]
    
    @available(*, deprecated, message: "Do not call directly. Required for 'AutomaticDirectiveConvertible'.")
    required init(originalMarkup: BlockDirective) {
        self.originalMarkup = originalMarkup
    }
}