134 lines
2.9 KiB
Java
134 lines
2.9 KiB
Java
<h2>Numbers</h2>
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<pre><code>123
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123L
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0x0F
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0b00001011
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123.5
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123.5e10
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123.5f
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123.5F</code></pre>
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<h2>Strings and interpolation</h2>
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<pre><code>'2'
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'\uFF00'
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'\''
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"foo $bar \"baz"
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"""
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foo ${40 + 2}
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baz${bar()}
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"""</code></pre>
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<h2>Labels</h2>
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<pre><code>loop@ for (i in 1..100) {
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for (j in 1..100) {
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if (...)
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break@loop
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}
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}</code></pre>
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<h2>Annotations</h2>
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<pre><code>public class MyTest {
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lateinit var subject: TestSubject
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@SetUp fun setup() {
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subject = TestSubject()
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}
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@Test fun test() {
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subject.method() // dereference directly
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}
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}</code></pre>
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<h2>Full example</h2>
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<pre><code>package com.example.html
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interface Element {
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fun render(builder: StringBuilder, indent: String)
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override fun toString(): String {
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val builder = StringBuilder()
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render(builder, "")
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return builder.toString()
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}
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}
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class TextElement(val text: String): Element {
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override fun render(builder: StringBuilder, indent: String) {
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builder.append("$indent$text\n")
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}
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}
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abstract class Tag(val name: String): Element {
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val children = arrayListOf<Element>()
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val attributes = hashMapOf<String, String>()
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protected fun initTag<T: Element>(tag: T, init: T.() -> Unit): T {
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tag.init()
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children.add(tag)
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return tag
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}
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override fun render(builder: StringBuilder, indent: String) {
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builder.append("$indent<$name${renderAttributes()}>\n")
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for (c in children) {
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c.render(builder, indent + " ")
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}
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builder.append("$indent</$name>\n")
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}
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private fun renderAttributes(): String? {
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val builder = StringBuilder()
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for (a in attributes.keySet()) {
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builder.append(" $a=\"${attributes[a]}\"")
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}
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return builder.toString()
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}
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}
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abstract class TagWithText(name: String): Tag(name) {
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operator fun String.plus() {
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children.add(TextElement(this))
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}
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}
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class HTML(): TagWithText("html") {
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fun head(init: Head.() -> Unit) = initTag(Head(), init)
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fun body(init: Body.() -> Unit) = initTag(Body(), init)
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}
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class Head(): TagWithText("head") {
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fun title(init: Title.() -> Unit) = initTag(Title(), init)
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}
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class Title(): TagWithText("title")
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abstract class BodyTag(name: String): TagWithText(name) {
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fun b(init: B.() -> Unit) = initTag(B(), init)
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fun p(init: P.() -> Unit) = initTag(P(), init)
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fun h1(init: H1.() -> Unit) = initTag(H1(), init)
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fun a(href: String, init: A.() -> Unit) {
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val a = initTag(A(), init)
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a.href = href
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}
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}
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class Body(): BodyTag("body")
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class B(): BodyTag("b")
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class P(): BodyTag("p")
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class H1(): BodyTag("h1")
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class A(): BodyTag("a") {
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public var href: String
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get() = attributes["href"]!!
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set(value) {
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attributes["href"] = value
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}
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}
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fun html(init: HTML.() -> Unit): HTML {
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val html = HTML()
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html.init()
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return html
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}</code></pre> |