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Reactive HTML elements for Scala and Scala.js
There is a newer version: 24.11.0
/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package wvlet.airframe.rx.html

import wvlet.airframe.rx.{Rx, RxOption}
import scala.annotation.implicitNotFound
import scala.language.{higherKinds, implicitConversions}

/**
  * Render an element only when the condition is true
  *
  * @param cond
  * @param body
  * @return
  *   rendered element or empty
  */
def when(cond: Boolean, body: => HtmlNode): HtmlNode =
  if cond then body
  else HtmlNode.empty

implicit def embedAsNode[A: EmbeddableNode](v: A): RxElement = Embedded(v)

@implicitNotFound(msg = "Unsupported type as an attribute value")
private[html] trait EmbeddableAttribute[X]

private[html] object EmbeddableAttribute:
  type EA[A] = EmbeddableAttribute[A]

  @inline implicit def embedNone: EA[None.type] = null

  @inline implicit def embedBoolean: EA[Boolean] = null

  @inline implicit def embedInt: EA[Int] = null

  @inline implicit def embedLong: EA[Long] = null

  @inline implicit def embedString: EA[String] = null

  @inline implicit def embedFloat: EA[Float] = null

  @inline implicit def embedDouble: EA[Double] = null

  @inline implicit def embedF0[U]: EA[() => U] = null

  @inline implicit def embedF1[I, U]: EA[I => U] = null

  @inline implicit def embedOption[C[x] <: Option[x], A: EA]: EA[C[A]] = null

  @inline implicit def embedRx[C[x] <: Rx[x], A: EA]: EA[C[A]] = null

  @inline implicit def embedRxOption[C[x] <: RxOption[x], A: EA]: EA[C[A]] = null

  @inline implicit def embedSeq[C[x] <: Iterable[x], A: EA]: EA[C[A]] = null

@implicitNotFound(msg = "Unsupported type as an HtmlNode")
private[html] trait EmbeddableNode[A]

private[html] object EmbeddableNode extends compat.PlatformEmbeddableNode:
  type EN[A] = EmbeddableNode[A]

  @inline implicit def embedNil: EN[Nil.type] = null

  @inline implicit def embedNone: EN[None.type] = null

  @inline implicit def embedBoolean: EN[Boolean] = null

  @inline implicit def embedInt: EN[Int] = null

  @inline implicit def embedChar: EN[Char] = null

  @inline implicit def embedShort: EN[Short] = null

  @inline implicit def embedByte: EN[Byte] = null

  @inline implicit def embedLong: EN[Long] = null

  @inline implicit def embedFloat: EN[Float] = null

  @inline implicit def embedDouble: EN[Double] = null

  @inline implicit def embedString: EN[String] = null

  @inline implicit def embedHtmlNode[A <: HtmlNode]: EN[A] = null

  @inline implicit def embedRx[C[x] <: Rx[x], A: EN]: EN[C[A]] = null

  @inline implicit def embedRxOption[C[x] <: RxOption[x], A: EN]: EN[C[A]] = null

  @inline implicit def embedSeq[C[x] <: Iterable[x], A: EN]: EN[C[A]] = null

  @inline implicit def embedOption[C[x] <: Option[x], A: EN]: EN[C[A]] = null