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Using indirect enums to create a simplified XML generator in just a few lines of code
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| indirect enum Node { | |
| case tag(String, [Node]) | |
| case text(String) | |
| } | |
| extension Node: CustomStringConvertible { | |
| var description: String { | |
| switch self { | |
| case let .tag(name, children): | |
| if children.count == 1, case let .some(.text(text)) = children.first { | |
| return "<\(name)>\(text)</\(name)>" | |
| } | |
| let content = children | |
| .flatMap { $0.description.split(separator: "\n") } | |
| .map { " \($0)" } | |
| return "<\(name)>\n\(content.joined(separator: "\n"))\n</\(name)>" | |
| case let .text(text): | |
| return text | |
| } | |
| } | |
| } | |
| let document: Node = .tag("html", [ | |
| .tag("head", [ | |
| .tag("title", [.text("Example")]), | |
| ]), | |
| .tag("body", [ | |
| .tag("h1", [.text("Hello World!")]), | |
| .tag("p", [.text("Welcome to this site. Here are my favorite things:")]), | |
| .tag("ul", [ | |
| .tag("li", [.text("Burgers")]), | |
| .tag("li", [.text("Computers")]), | |
| .tag("li", [.text("Ice cream")]), | |
| ]), | |
| ]), | |
| ]) | |
| print(document) | |
| /* Prints: | |
| <html> | |
| <head> | |
| <title>Example</title> | |
| </head> | |
| <body> | |
| <h1>Hello World!</h1> | |
| <p>Welcome to this site. Here are my favorite things:</p> | |
| <ul> | |
| <li>Burgers</li> | |
| <li>Computers</li> | |
| <li>Ice cream</li> | |
| </ul> | |
| </body> | |
| </html> | |
| */ |
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