Created
August 5, 2014 22:52
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import Foundation | |
struct Builder { | |
typealias Attributes = Dictionary<String, AnyObject> | |
typealias Block = () -> () | |
typealias Visitor = (Node) -> () | |
class Node { | |
var name: String | |
var parent: Node? { didSet { level = parent!.level + 1} } | |
var children = [Node]() | |
var attr = Attributes() | |
var block: Block? | |
var level = 0 | |
var value : AnyObject? | |
init(name: String) { | |
self.name = name | |
} | |
func visit(before: Visitor?, after: Visitor?) { | |
if let v = before { v(self) } | |
for c in children { c.visit(before, after: after) } | |
if let v = after { v(self) } | |
} | |
} | |
static let root = Node(name: "root") | |
static var current = root | |
static func node(name: String, attr: Attributes?, value: AnyObject?, block: Block?) { | |
var n = Node(name: name) | |
n.parent = current | |
if let a = attr { n.attr = a } | |
n.block = block | |
n.value = value | |
current.children.append(n) | |
current = n | |
if let b = block { b() } | |
if let p = current.parent { current = p } | |
} | |
static func visit(before: Visitor?, after: Visitor?) { | |
for c in root.children { c.visit(before, after: after) } | |
} | |
} | |
func html(block: () -> ()) -> () { html(nil, block) } | |
func html(attr: Builder.Attributes?, block: () -> ()) -> () { Builder.node("html", attr: attr, value: nil, block: block) } | |
func body(block: () -> ()) { body(nil, block) } | |
func body(attr: Builder.Attributes?, block: () -> ()) { Builder.node("body", attr: attr, value: nil, block: block) } | |
func head(block: () -> ()) { head(nil, block) } | |
func head(attr: Builder.Attributes?, block: () -> ()) { Builder.node("head", attr: attr, value: nil, block: block) } | |
func title(block: ()->()) { title(nil, nil, block) } | |
func title(attr: Builder.Attributes?, block: ()->()) { title(attr, nil, block) } | |
func title(value: AnyObject?, block: ()->()) { title(nil, value, block) } | |
func title(attr: Builder.Attributes?, value: AnyObject?, block: ()->()) { Builder.node("title", attr: attr, value: value, block) } | |
func div(block: ()->()) { div(nil, nil, block) } | |
func div(attr: Builder.Attributes?, block: ()->()) { div(attr, nil, block) } | |
func div(value: AnyObject?, block: ()->()) { div(nil, value, block) } | |
func div(attr: Builder.Attributes?, value: AnyObject?, block: ()->()) { Builder.node("div", attr: attr, value: value, block) } | |
func p(block: ()->()) { p(nil, nil, block) } | |
func p(attr: Builder.Attributes?, block: ()->()) { p(attr, nil, block) } | |
func p(value: AnyObject?, block: ()->()) { p(nil, value, block) } | |
func p(attr: Builder.Attributes?, value: AnyObject?, block: ()->()) { Builder.node("p", attr: attr, value: value, block) } | |
func a(block: ()->()) { a(nil, nil, block) } | |
func a(attr: Builder.Attributes?, block: ()->()) { a(attr, nil, block) } | |
func a(value: AnyObject?, block: ()->()) { a(nil,value, block) } | |
func a(attr: Builder.Attributes?, value: AnyObject?, block: ()->()) { Builder.node("a", attr: attr, value: value, block) } | |
func visit(before: Builder.Visitor?, after: Builder.Visitor? = nil) { | |
Builder.visit(before, after) | |
} | |
html { | |
head { | |
for i in 0..<3 { | |
div(["id":"div_\(i)"]) { | |
p("Click ") { | |
a(["href":"http://www.example.com/link\(i).html"], | |
"link \(i+1)") {} | |
} | |
} | |
} | |
} | |
} | |
func repeat( item: String, n: Int) -> String { | |
var s = "" | |
for var i:Int=0; i<n; i++ { s += item } | |
return s | |
} | |
visit( { | |
let node = $0 | |
let r = repeat(" ", node.level*2) | |
var tag = "\(r)<\(node.name)" | |
for a in node.attr { tag += " \(a.0)= \"\(a.1)\"" } | |
tag += ">" | |
if let v:AnyObject = node.value { tag += "\(v)" } | |
println(tag) | |
}, | |
{ | |
let node = $0 | |
let r = repeat(" ", node.level*2) | |
var tag = "\(r)</\(node.name)>" | |
println(tag) | |
} ) | |
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