Created
February 26, 2022 08:36
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| import Foundation | |
| struct Output: TextOutputStream { | |
| mutating func write(_ string: String) { | |
| print(string, terminator: "") | |
| } | |
| } | |
| protocol Drawable { | |
| func draw_(out: inout Output, position: Int) | |
| } | |
| struct object_t { | |
| struct model<T>: Drawable { | |
| private let data_: T | |
| init(_ x: T) { | |
| data_ = x | |
| } | |
| func draw_(out: inout Output, position: Int) { | |
| draw(data_, out: &out, position: position) | |
| } | |
| } | |
| fileprivate let self_: Drawable | |
| init<T>(_ x: T) { | |
| self_ = model(x) | |
| } | |
| } | |
| typealias document_t = Array<object_t> | |
| extension document_t { | |
| mutating func append<T>(_ x: T) { | |
| self.append(object_t(x)) | |
| } | |
| } | |
| func draw<T>(_ x: T, out: inout Output, position: Int) { | |
| if let document = x as? document_t { | |
| draw(document, out: &out, position: position) | |
| return | |
| } | |
| print(String(repeating: " ", count: position), x, to: &out) | |
| } | |
| func draw(_ x: object_t, out: inout Output, position: Int) { | |
| x.self_.draw_(out: &out, position: position) | |
| } | |
| func draw(_ x: document_t, out: inout Output, position: Int) { | |
| print(String(repeating: " ", count: position), "<document>", to: &out) | |
| for elem in x { draw(elem, out: &out, position: position + 2) } | |
| print(String(repeating: " ", count: position), "</document>", to: &out) | |
| } | |
| var document = document_t() | |
| document.append(1) | |
| document.append("Zwei") | |
| document.append(document) | |
| document.append(false) | |
| var out = Output() | |
| draw(document, out: &out, position: 0) |
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