Scala example source code file (XMLCompletion.scala)

This example Scala source code file (XMLCompletion.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

completionaware, int, int, list, node, node, option, string, string, xmlcompletion, xmlcompletion

The Scala XMLCompletion.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author Paul Phillips
 */
 
package scala.tools.nsc
package interpreter

import xml.{ XML, Group, Node, NodeSeq }
import XMLCompletion._
import scala.collection.{ mutable, immutable }

class XMLCompletion(root: Node) extends CompletionAware {  
  private val nodeCache = new mutable.HashMap[String, Node]
  private def getNode(s: String): Option[Node] = {
    completions // make sure cache is populated
    nodeCache get s
  }
  
  lazy val completions: List[String] = {
    def children = root.child.toList
    def uniqueTags = children groupBy (_.label) filter (_._2.size == 1) map (_._1)
    val uniqs = uniqueTags.toList
    
    children.foldLeft(List[String]())((res, node) => {
      val name = node.label
      def count = res filter (_ startsWith (name + "[")) size  // ]
      val suffix = if (uniqs contains name) "" else "[%d]" format (count + 1)
      val s = name + suffix
      
      nodeCache(s) = node
      
      s :: res
    }).sorted
  }
  def completions(verbosity: Int) = completions
  
  override def execute(id: String)  = getNode(id)
  override def follow(id: String)   = getNode(id) map (x => new XMLCompletion(x))
}

object XMLCompletion {
  def apply(x: Node) = new XMLCompletion(x)
}