binder.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 62 行

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2007, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

// $Id: Binder.scala 10788 2007-04-23 15:38:07Z michelou $


package scala.xml.factory


import scala.xml.parsing.ValidatingMarkupHandler

/**
 *  @author Burak Emir
 */
abstract class Binder(val preserveWS: Boolean) extends ValidatingMarkupHandler {

  var result: NodeBuffer = new NodeBuffer()

  def reportSyntaxError(pos:Int, str:String) = {}

  final def procInstr(pos: Int, target: String, txt: String) =
    ProcInstr(target, txt)

  final def comment(pos: Int, txt: String) =
    Comment(txt)

  final def entityRef(pos: Int, n: String) =
    EntityRef(n)

  final def text(pos: Int, txt: String) =
    Text(txt)

  final def traverse(n:Node): Unit = n match {
    case x:ProcInstr =>
      result &+ procInstr(0, x.target, x.text)
    case x:Comment   =>
      result &+ comment(0, x.text)
    case x:Text      =>
      result &+ text(0, x.data)
    case x:EntityRef =>
      result &+ entityRef(0, x.entityName)
    case _ => 
      elemStart(0, n.prefix, n.label, n.attributes, n.scope)
      val old = result
      result = new NodeBuffer()
      for (m <- n.child) traverse(m)
      result = old &+ elem(0, n.prefix, n.label, n.attributes, n.scope, NodeSeq.fromSeq(result)).toList;
      elemEnd(0, n.prefix, n.label)
  }
  
  final def validate(n: Node): Node = {
    this.rootLabel = n.label
    traverse(n)
    result(0)
  }
}