mwaterfall

// Very slightly adapted from http://stackoverflow.com/a/30141700/106244
// 99.99% Credit to Martin R!

// Mapping from XML/HTML character entity reference to character
// From http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references
private let characterEntities : [String: Character] = [
    
    // XML predefined entities:
    """     : "\"",
    "&"      : "&",

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// Line Height Bookmarklet
// javascript:(function(lineHeight) %7B%0A  if (window.guide) %7B%0A    document.body.removeChild(window.guide)%3B%0A    window.guide %3D null%3B%0A  %7D else %7B%0A    window.guide %3D document.createElement("div")%3B%0A    guide.style.id %3D "grid_overlay"%3B%0A    guide.style.position %3D "absolute"%3B%0A    guide.style.left %3D "0"%3B%0A    guide.style.top %3D "-1px"%3B%0A    guide.style.width %3D "100%25"%3B%0A    guide.style.height %3D (document.body.clientHeight > document.documentElement.clientHeight) %3F document.body.clientHeight %2B "px" %3A "100%25"%3B%0A    guide.style.pointerEvents %3D "none"%3B%0A    guide.style.userSelect %3D "none"%3B%0A    guide.style.background %3D "linear-gradient(rgba(0%2C 119%2C 179%2C 0.2) 1px%2C transparent 1px) left top %2F " %2B lineHeight %2B " " %2B lineHeight%3B%0A    document.body.appendChild(guide)%0A  %7D%0A%7D)("27px")%3B%0A

(function(lineHeight) {
  if (window.guide) {
    document.body.removeChild(window.guide);
    window.guide =

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struct ImageDescriptor<ImageReference> {
    var imageReference: ImageReference
    var properties: UIImageView.Properties
}

extension UIImageView {
    struct Properties {
        var contentMode: UIViewContentMode
        var backgroundColor: UIColor
        var tintColor: UIColor

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extension UIImageView {
    func apply(_ imageDescriptor: ImageDescriptor<UIImage>)
    func apply(
        _ imageDescriptor: ImageDescriptor<URL>,
        loading loadingImageDescriptor: ImageDescriptor<UIImage>? = nil,
        failure failureImageDescriptor: ImageDescriptor<UIImage>? = nil
    )
}

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extension UIImageView {
    func apply(_ imageDescriptor: ImageDescriptor<UIImage>) {
        cancelAnyExistingFetches()
        
        accessibilityIdentifier = imageDescriptor.properties.accessibilityIdentifier
        backgroundColor = imageDescriptor.properties.backgroundColor
        contentMode = imageDescriptor.properties.contentMode
        tintColor = imageDescriptor.properties.tintColor
        image = imageDescriptor.imageReference
    }

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extension ImageDescriptor where ImageReference == UIImage {
    static let logo = ImageDescriptor<UIImage>(
        imageReference: UIImage(named: "logo")!.withRenderingMode(.alwaysTemplate),
        properties: UIImageView.Properties(
            contentMode: .center,
            backgroundColor: .white,
            tintColor: .lightGray,
            accessibilityIdentifier: "logoImage"
        )
    )

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imageView.apply(.logo)

imageView.apply(
    .productImage(with: URL(string: "http://my-image-url")!), 
    loading: .loading, 
    failure: .failure
)

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enum Material: String, Codable {
    case wood, metal, glass, other
}

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extension Material {
    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        let rawMaterial = try container.decode(String.self)
        self = Material(rawValue: rawMaterial) ?? .other
    }
}

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extension RawRepresentable where RawValue: Decodable {
    init(from decoder: Decoder, default: Self) throws {
        let container = try decoder.singleValueContainer()
        let rawValue = try container.decode(RawValue.self)
        self = Self(rawValue: rawValue) ?? `default`
    }
}