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July 22, 2020 15:56
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Second and much nicer cut on HTML DSL in swift. No attributes etc yet, but this is a cleaner base design (in some ways at least)
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| import Foundation | |
| extension XMLNode { | |
| func named(_ name: String) -> XMLNode { | |
| self.name = name | |
| return self | |
| } | |
| func string (_ string: String) -> XMLNode { | |
| self.stringValue = string | |
| return self | |
| } | |
| func children(_ children: [XMLNode] ) -> XMLNode { | |
| _ = children.map((self as! XMLElement).addChild) | |
| return self | |
| } | |
| func attributes( _ attributes: [XMLNode] ) -> XMLNode { | |
| _ = attributes.map((self as! XMLElement).addAttribute) | |
| return self | |
| } | |
| } | |
| @_functionBuilder struct XMLBuilder { | |
| static func buildBlock( _ content: String) -> XMLNode { | |
| XMLNode(kind: .element).string(content) | |
| } | |
| static func buildBlock(_ content: XMLNode...) -> XMLNode { | |
| XMLNode(kind: .element).children(content.map{$0}) | |
| } | |
| static func buildBlock(_ content: String, _ children: XMLNode...) -> XMLNode { | |
| XMLNode(kind: .element).string(content).children(children.map{$0}) | |
| } | |
| } | |
| enum CssAttribute { | |
| case id (String) | |
| case `class` (String) | |
| func attribute(_ name: String, _ value: String) -> XMLNode { | |
| XMLNode.attribute(withName: name, stringValue: value) as! XMLNode | |
| } | |
| var node: XMLNode { | |
| switch self { | |
| case .id (let value): return attribute("id", value) | |
| case .class(let value): return attribute("class", value) | |
| } | |
| } | |
| } | |
| func html (@XMLBuilder _ content: () -> XMLNode) -> XMLElement { | |
| content().named("html") as! XMLElement | |
| } | |
| func body (_ attribs: CssAttribute..., @XMLBuilder content: () -> XMLNode) -> XMLNode { | |
| content().named("body").attributes( attribs.map{$0.node} ) | |
| } | |
| func div (_ attribs: CssAttribute..., @XMLBuilder content: () -> XMLNode) -> XMLNode { | |
| content().named("div").attributes( attribs.map{$0.node} ) | |
| } | |
| func p (_ attribs: CssAttribute..., @XMLBuilder content: () -> XMLNode) -> XMLNode { | |
| content().named("p").attributes( attribs.map{$0.node} ) | |
| } | |
| func pretty(_ element: XMLElement) { | |
| let xmldoc = XMLDocument(rootElement: element) | |
| xmldoc.documentContentKind = .html | |
| print(xmldoc.xmlString(options: [ .nodePrettyPrint, .documentTidyHTML, .nodePreserveWhitespace])) | |
| } | |
| pretty ( | |
| html { | |
| body { | |
| div ( .id("main"), .class("content") ) { | |
| p { "paragraph 1" } | |
| p { "paragraph 2" } | |
| } | |
| div ( .id("secondary"), .class("content") ) { | |
| p { "paragraph 3" } | |
| p { "paragraph 4" } | |
| } | |
| } | |
| } | |
| ) | |
| /* | |
| <html> | |
| <body> | |
| <div id="main" class="content"> | |
| <p>paragraph 1</p> | |
| <p>paragraph 2</p> | |
| </div> | |
| <div id="secondary" class="content"> | |
| <p>paragraph 3</p> | |
| <p>paragraph 4</p> | |
| </div> | |
| </body> | |
| </html> | |
| */ |
Added in some css attributes. Note we can lose the underscore and use variadic notation for the first param while avoiding the need to actually use the name of the trailing closure param. Fun!
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Updated to clean up a bit