added form, mouse, and keyboard events (#6)

Sources/Elementary/HtmlAttributes+Events.swift

@@ -0,0 +1,62 @@
+public extension HTMLAttribute where Tag: HTMLTrait.Attributes.Global {
+    static func on(_ event: HTMLAttributeValue.MouseEvent, _ script: String) -> Self { .init(on: event, script: script) }
+    static func on(_ event: HTMLAttributeValue.FormEvent, _ script: String) -> Self { .init(on: event, script: script) }
+    static func on(_ event: HTMLAttributeValue.KeyboardEvent, _ script: String) -> Self { .init(on: event, script: script) }
+}
+
+// TODO: window events, drag events, media events (more scoped)
+
+public extension HTMLAttributeValue {
+    struct MouseEvent: HTMLEventName {
+        public var rawValue: String
+        public init(rawValue: String) {
+            self.rawValue = rawValue
+        }
+
+        public static var click: Self { .init(rawValue: "click") }
+        public static var dblclick: Self { .init(rawValue: "dblclick") }
+        public static var mousedown: Self { .init(rawValue: "mousedown") }
+        public static var mousemove: Self { .init(rawValue: "mousemove") }
+        public static var mouseout: Self { .init(rawValue: "mouseout") }
+        public static var mouseover: Self { .init(rawValue: "mouseover") }
+        public static var mouseup: Self { .init(rawValue: "mouseup") }
+        public static var wheel: Self { .init(rawValue: "wheel") }
+    }
+
+    struct KeyboardEvent: HTMLEventName {
+        public var rawValue: String
+        public init(rawValue: String) {
+            self.rawValue = rawValue
+        }
+
+        public static var keydown: Self { .init(rawValue: "keydown") }
+        public static var keypress: Self { .init(rawValue: "keypress") }
+        public static var keyup: Self { .init(rawValue: "keyup") }
+    }
+
+    struct FormEvent: HTMLEventName {
+        public var rawValue: String
+        public init(rawValue: String) {
+            self.rawValue = rawValue
+        }
+
+        public static var blur: Self { .init(rawValue: "blur") }
+        public static var change: Self { .init(rawValue: "change") }
+        public static var contextmenu: Self { .init(rawValue: "contextmenu") }
+        public static var focus: Self { .init(rawValue: "focus") }
+        public static var input: Self { .init(rawValue: "input") }
+        public static var invalid: Self { .init(rawValue: "invalid") }
+        public static var reset: Self { .init(rawValue: "reset") }
+        public static var search: Self { .init(rawValue: "search") }
+        public static var select: Self { .init(rawValue: "select") }
+        public static var submit: Self { .init(rawValue: "submit") }
+    }
+}
+
+protocol HTMLEventName: RawRepresentable {}
+
+extension HTMLAttribute {
+    init(on eventName: some HTMLEventName, script: String) {
+        self.init(name: "on\(eventName.rawValue)", value: script)
+    }
+}

Tests/ElementaryTests/AttributeRenderingTests.swift

@@ -67,4 +67,25 @@ final class AttributeRenderingTests: XCTestCase {
             #"<br id="1-2" data-bar="bazbaq">"#
         )
     }
+
+    func testRendersMouseEventAttribute() {
+        HTMLAssertEqual(
+            p(.on(.click, "doIt()")) {},
+            #"<p onclick="doIt()"></p>"#
+        )
+    }
+
+    func testRendersKeyboardEventAttribute() {
+        HTMLAssertEqual(
+            p(.on(.keydown, "doIt()")) {},
+            #"<p onkeydown="doIt()"></p>"#
+        )
+    }
+
+    func testRendersFormEventAttribute() {
+        HTMLAssertEqual(
+            p(.on(.blur, "doIt()")) {},
+            #"<p onblur="doIt()"></p>"#
+        )
+    }
 }