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/*
This source file is part of the Swift.org open source project
Copyright (c) 2021 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
/**
This transformation removes the hierarchy information from a render node JSON,
also getting rid of the dead references. It's useful to save space when the
hierarchy information is not a key information to preserve.
*/
public struct RemoveHierarchyTransformation: RenderNodeTransforming {
public init() {}
public func transform(renderNode: RenderNode, context: RenderNodeTransformationContext)
-> RenderNodeTransformationResult {
var (renderNode, context) = (renderNode, context)
let identifiersInHierarchy: [String] = {
switch renderNode.hierarchy {
case .reference(let reference):
return reference.paths.flatMap { $0 }
case .tutorials(let tutorial):
return tutorial.paths.flatMap { $0 }
case .none:
return []
}
}()
// Remove hierarchy.
renderNode.hierarchy = nil
// Remove unused references.
for identifier in identifiersInHierarchy {
context.referencesCount[identifier]? -= 1
}
return (renderNode, context)
}
}
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