Scala example source code file (MemberLookup.scala)

This example Scala source code file (MemberLookup.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

anyclass, anyrefclass, anyvalclass, compiler, entityimpl, linkto, linktomember, listclass, nothingclass, nsc, option, some, symbol

The MemberLookup.scala Scala example source code

package scala.tools.nsc
package doc
package model

import base._

/** This trait extracts all required information for documentation from compilation units */
trait MemberLookup extends base.MemberLookupBase {
  thisFactory: ModelFactory =>

  import global._
  import definitions.{ NothingClass, AnyClass, AnyValClass, AnyRefClass, ListClass }

  override def internalLink(sym: Symbol, site: Symbol): Option[LinkTo] =
    findTemplateMaybe(sym) match {
      case Some(tpl) => Some(LinkToTpl(tpl))
      case None =>
        findTemplateMaybe(site) flatMap { inTpl =>
          inTpl.members find (_.asInstanceOf[EntityImpl].sym == sym) map (LinkToMember(_, inTpl))
        }
    }

  override def chooseLink(links: List[LinkTo]): LinkTo = {
    val mbrs = links.collect {
      case lm@LinkToMember(mbr: MemberEntity, _) => (mbr, lm)
    }
    if (mbrs.isEmpty)
      links.head
    else
      mbrs.min(Ordering[MemberEntity].on[(MemberEntity, LinkTo)](_._1))._2
  }

  override def toString(link: LinkTo) = link match {
    case LinkToTpl(tpl: EntityImpl) => tpl.sym.toString
    case LinkToMember(mbr: EntityImpl, inTpl: EntityImpl) =>
      mbr.sym.signatureString + " in " + inTpl.sym.toString
    case _ => link.toString
  }

  override def findExternalLink(sym: Symbol, name: String): Option[LinkToExternal] = {
    val sym1 =
      if (sym == AnyClass || sym == AnyRefClass || sym == AnyValClass || sym == NothingClass) ListClass
      else if (sym.isPackage) 
        /* Get package object which has associatedFile ne null */
        sym.info.member(newTermName("package"))
      else sym
    Option(sym1.associatedFile) flatMap (_.underlyingSource) flatMap { src =>
      val path = src.path
      settings.extUrlMapping get path map { url =>
        LinkToExternal(name, url + "#" + name)
      }
    }
  }

  override def warnNoLink = !settings.docNoLinkWarnings.value
}