kmx.io/prism.js/examples/prism-scala.html

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• Hash : 36a5fa0e
  Author :
  Date : 2019-06-30T04:19:54
  

  Known failure page (#1876) This PR adds a known failures page. This resolves #1750. The known failures are moved from the example pages. (I also updated all example pages with invalid HTML.) Some known failures were actually fixed in the meantime but never updated, so I removed a few. Those were: - Handlebars - Markdown's nested bold-italic - Smarty - Textile's "Nested styles are only partially supported" ### Screenshot <details>  </details>

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• examples/prism-scala.html

• <h2>Comments</h2>
  <pre><code>// Single line comment
  /* Mutli-line
  comment */</code></pre>
  
  <h2>Strings and characters</h2>
  <pre><code>'a'
  "foo bar baz"
  """Multi-line
  string"""</code></pre>
  
  <h2>Numbers</h2>
  <pre><code>0
  21
  0xFFFFFFFF
  -42L
  0.0
  1e30f
  3.14159f
  1.0e-100
  .1
  </code></pre>
  
  <h2>Symbols</h2>
  <pre><code>'x
  'identifier</code></pre>
  
  <h2>Full example</h2>
  <pre><code>// Contributed by John Williams
  package examples
  
  object lazyLib {
  
    /** Delay the evaluation of an expression until it is needed. */
    def delay[A](value: => A): Susp[A] = new SuspImpl[A](value)
  
    /** Get the value of a delayed expression. */
    implicit def force[A](s: Susp[A]): A = s()
  
    /**
     * Data type of suspended computations. (The name froms from ML.)
     */
    abstract class Susp[+A] extends Function0[A]
  
    /**
     * Implementation of suspended computations, separated from the
     * abstract class so that the type parameter can be invariant.
     */
    class SuspImpl[A](lazyValue: => A) extends Susp[A] {
      private var maybeValue: Option[A] = None
  
      override def apply() = maybeValue match {
        case None =>
          val value = lazyValue
          maybeValue = Some(value)
          value
  	  case Some(value) =>
          value
      }
  
      override def toString() = maybeValue match {
        case None => "Susp(?)"
        case Some(value) => "Susp(" + value + ")"
      }
    }
  }
  
  object lazyEvaluation {
    import lazyLib._
  
    def main(args: Array[String]) = {
      val s: Susp[Int] = delay { println("evaluating..."); 3 }
  
      println("s     = " + s)       // show that s is unevaluated
      println("s()   = " + s())     // evaluate s
      println("s     = " + s)       // show that the value is saved
      println("2 + s = " + (2 + s)) // implicit call to force()
  
      val sl = delay { Some(3) }
      val sl1: Susp[Some[Int]] = sl
      val sl2: Susp[Option[Int]] = sl1   // the type is covariant
  
      println("sl2   = " + sl2)
      println("sl2() = " + sl2())
      println("sl2   = " + sl2)
    }
  }</code></pre>
  

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