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Lift Framework example source code file (Tail.scala)

This example Lift Framework source code file (Tail.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 - Lift Framework tags/keywords

dispatchit, dispatchit, dispatchsnippet, dispatchsnippet, elem, elem, group, head, nodeseq, nodeseq, set, tail

The Lift Framework Tail.scala source code

/*
 * Copyright 2009-2011 WorldWide Conferencing, LLC
 *
 * 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 net.liftweb 
package builtin 
package snippet 

import http._
import util._
import scala.xml._



object Tail extends DispatchSnippet {
   def dispatch: DispatchIt = {
     case _ => render _
   }

   def render(xhtml: NodeSeq) : NodeSeq = <tail>{xhtml}
}

/**
 * The 'head' snippet.  Use this snippet to move
 * a chunk of 
 */
object Head extends DispatchSnippet {
  lazy val valid = Set("title", "base",
                       "link", "meta", "style",
                       "script")

   def dispatch: DispatchIt = {
     case _ => render _
   }

   def render(_xhtml: NodeSeq) : NodeSeq = {
     def validHeadTagsOnly(in: NodeSeq): NodeSeq = 
       in  flatMap {
         case Group(ns) => validHeadTagsOnly(ns)
         case e: Elem if (null eq e.prefix) && valid.contains(e.label) => {
           new Elem(e.prefix,
                    e.label,
                    e.attributes,
                    e.scope,
                    validHeadTagsOnly(e.child) :_*)
         }
         case e: Elem if (null eq e.prefix) => NodeSeq.Empty
         case x => x
       }
     
       val xhtml = validHeadTagsOnly(_xhtml)

     <head>{
       if ((S.attr("withResourceId") or S.attr("withresourceid")).filter(Helpers.toBoolean).isDefined) {
         WithResourceId.render(xhtml)
       } else {
         xhtml
       }
     }</head>
   }
}

Other Lift Framework examples (source code examples)

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