laika.render.epub.XHTMLRenderer.scala Maven / Gradle / Ivy

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/*
 * Copyright 2012-2020 the original author or authors.
 *
 * 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 laika.render.epub

import laika.ast._
import laika.render.{HTMLFormatter, HTMLRenderer}

/** Customizations of the default HTML renderer for AST elements where attributes specific to EPUB need to be rendered.
  *
  *  @author Jens Halm
  */
object XHTMLRenderer extends HTMLRenderer(fileSuffix = "epub.xhtml", format = "epub") {

  def renderChoices (fmt: HTMLFormatter, name: String, choices: Seq[Choice], options: Options): String = {
    val content = choices.flatMap { choice => Paragraph(Strong(Text(choice.label))) +: choice.content }
    fmt.child(BlockSequence(content, options))
  }
  
  override def apply (fmt: HTMLFormatter, element: Element): String = element match {
      
    case CitationLink(ref,label,opt) => 
      fmt.textElement("a", opt + Style.citation, "[" + label + "]", "href" -> ("#"+ref), "epub:type" -> "noteref")
    
    case FootnoteLink(ref,label,opt) => 
      fmt.textElement("a", opt + Style.footnote, "[" + label + "]", "href" -> ("#"+ref), "epub:type" -> "noteref")
    
    case Citation(_,content,opt) => 
      fmt.indentedElement("aside", opt + Style.citation, content, "epub:type" -> "footnote")
    
    case Footnote(_,content,opt) => 
      fmt.indentedElement("aside", opt + Style.footnote, content, "epub:type" -> "footnote")
    
    case Selection(name, choices, opt) => 
      renderChoices(fmt, name, choices, opt)
    
    case _ => 
      super.apply(fmt, element)
  }

}