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AssetSetFactory.swift
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AssetSetFactory.swift
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//
// Copyright (c) 2022 Nathan E. Walczak
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
import Foundation
protocol AssetSetFactory {
associatedtype AssetSet: Asset
var pathExtension: String { get }
func asset(namespace: String?, name: String, data: Data) -> AssetSet?
}
extension AssetSetFactory {
func assetItemsAt(paths: [String]) -> [AssetItem<AssetSet>] {
paths.flatMap { assetsAt(path: $0) }
}
func assetsAt(path: String) -> [AssetItem<AssetSet>] {
assetsAt(path: path, namespace: nil)
}
func assetsAt(path: String, namespace: String?) -> [AssetItem<AssetSet>] {
let fileManager = FileManager.default
guard let contents = try? fileManager.contentsOfDirectory(atPath: path) else {
return []
}
return contents.flatMap { content -> [AssetItem<AssetSet>] in
let file = path.appendingPathComponent(content)
guard fileManager.isDirectory(file) else {
return []
}
if file.pathExtension == pathExtension {
if let asset = assetAt(path: file, namespace: namespace) {
return [.asset(asset)]
}
return []
}
if providesNamespaceAt(path: file) {
let namespace = Naming.namespace(from: namespace, content)
let assets = assetsAt(path: file, namespace: namespace)
return assets.isEmpty ? [] : [.namespace(namespace, assets)]
}
return assetsAt(path: file, namespace: namespace)
}
.sorted()
}
func assetAt(path: String, namespace: String?) -> AssetSet? {
let url = URL(fileURLWithPath: path, isDirectory: false)
let contentsURL = url.appendingPathComponent("Contents.json")
guard let data = try? Data(contentsOf: contentsURL) else {
return nil
}
let name = url.lastPathComponent.deletingPathExtension
return asset(namespace: namespace, name: name, data: data)
}
func providesNamespaceAt(path: String) -> Bool {
let assetGroup = assetGroupAt(path: path)
return assetGroup?.properties?.providesNamespace == true
}
func assetGroupAt(path: String) -> AssetGroup? {
let url = URL(fileURLWithPath: path, isDirectory: false)
let contentsURL = url.appendingPathComponent("Contents.json")
guard let data = try? Data(contentsOf: contentsURL) else {
return nil
}
return try? JSONDecoder().decode(AssetGroup.self, from: data)
}
}