Lift Framework example source code file (LiftMerge.scala)
The Lift Framework LiftMerge.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 http
import scala.collection.mutable.{HashMap, ArrayBuffer, ListBuffer}
import scala.xml._
import net.liftweb.util._
import net.liftweb.common._
import net.liftweb.http.js._
import Helpers._
private[http] trait LiftMerge {
self: LiftSession =>
/**
* Manages the merge phase of the rendering pipeline
*/
def merge(xhtml: NodeSeq, req: Req): Node = {
val snippetHashs: HashMap[String, Box[NodeSeq]] = this.deferredSnippets.is
val waitUntil = millis + LiftRules.lazySnippetTimeout.vend.millis
val stripComments: Boolean = LiftRules.stripComments.vend
def waitUntilSnippetsDone() {
val myMillis = millis
snippetHashs.synchronized {
if (myMillis >= waitUntil || snippetHashs.isEmpty || !snippetHashs.values.toIterator.contains(Empty)) ()
else {
snippetHashs.wait(waitUntil - myMillis)
waitUntilSnippetsDone()
}
}
}
waitUntilSnippetsDone()
val processedSnippets: Map[String, NodeSeq] = Map(snippetHashs.toList.flatMap {
case (name, Full(value)) => List((name, value))
case (name, f: Failure) => List((name, LiftRules.deferredSnippetFailure.vend(f)))
case (name, Empty) => List((name, LiftRules.deferredSnippetTimeout.vend))
case _ => Nil
}: _*)
val hasHtmlHeadAndBody: Boolean = xhtml.find {
case e: Elem if e.label == "html" =>
e.child.find {
case e: Elem if e.label == "head" => true
case _ => false
}.isDefined &&
e.child.find {
case e: Elem if e.label == "body" => true
case _ => false
}.isDefined
case _ => false
}.isDefined
var htmlTag = <html xmlns="http://www.w3.org/1999/xhtml" xmlns:lift='http://liftweb.net'/>
var headTag = <head/>
var bodyTag = <body/>
val headChildren = new ListBuffer[Node]
val bodyChildren = new ListBuffer[Node]
val addlHead = new ListBuffer[Node]
addlHead ++= S.forHead()
val addlTail = new ListBuffer[Node]
addlTail ++= S.atEndOfBody()
val cometTimes = new ListBuffer[CometVersionPair]
val rewrite = URLRewriter.rewriteFunc
val fixHref = Req.fixHref
val contextPath: String = S.contextPath
def fixAttrs(original: MetaData, toFix: String, attrs: MetaData, fixURL: Boolean): MetaData = attrs match {
case Null => Null
case p: PrefixedAttribute if p.key == "when" && p.pre == "lift" =>
val when = p.value.text
original.find(a => !a.isPrefixed && a.key == "id").map {
id =>
cometTimes += CVP(id.value.text, when.toLong)
}
fixAttrs(original, toFix, p.next, fixURL)
case u: UnprefixedAttribute if u.key == toFix =>
new UnprefixedAttribute(toFix, fixHref(contextPath, attrs.value, fixURL, rewrite), fixAttrs(original, toFix, attrs.next, fixURL))
case _ => attrs.copy(fixAttrs(original, toFix, attrs.next, fixURL))
}
def _fixHtml(in: NodeSeq, _inHtml: Boolean, _inHead: Boolean, _justHead: Boolean, _inBody: Boolean, _justBody: Boolean, _bodyHead: Boolean, _bodyTail: Boolean, doMergy: Boolean): NodeSeq = {
in.flatMap {
v =>
var inHtml = _inHtml
var inHead = _inHead
var justHead = false
var justBody = false
var inBody = _inBody
var bodyHead = false
var bodyTail = false
v match {
case e: Elem if e.label == "html" &&
!inHtml => htmlTag = e; inHtml = true && doMergy
case e: Elem if e.label == "head" && inHtml &&
!inBody => headTag = e;
inHead = true && doMergy; justHead = true && doMergy
case e: Elem if (e.label == "head" ||
e.label.startsWith("head_")) &&
inHtml && inBody => bodyHead = true && doMergy
case e: Elem if e.label == "tail" && inHtml &&
inBody => bodyTail = true && doMergy
case e: Elem if e.label == "body" && inHtml =>
bodyTag = e; inBody = true && doMergy;
justBody = true && doMergy
case _ =>
}
val ret: NodeSeq = v match {
case Group(nodes) => Group(_fixHtml(nodes, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy))
// if it's a deferred node, grab it from the deferred list
case e: Elem if e.label == "node" && e.prefix == "lift_deferred" =>
for{
attr <- e.attributes("id").headOption.map(_.text).toList
nodes <- processedSnippets.get(attr).toList
node <- _fixHtml(nodes, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy)
} yield node
case e: Elem if e.label == "form" => Elem(v.prefix, v.label, fixAttrs(v.attributes, "action", v.attributes, true), v.scope, _fixHtml(v.child, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy): _*)
case e: Elem if e.label == "script" => Elem(v.prefix, v.label, fixAttrs(v.attributes, "src", v.attributes, false), v.scope, _fixHtml(v.child, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy): _*)
case e: Elem if e.label == "a" => Elem(v.prefix, v.label, fixAttrs(v.attributes, "href", v.attributes, true), v.scope, _fixHtml(v.child, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy): _*)
case e: Elem if e.label == "link" => Elem(v.prefix, v.label, fixAttrs(v.attributes, "href", v.attributes, false), v.scope, _fixHtml(v.child, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy): _*)
case e: Elem => Elem(v.prefix, v.label, fixAttrs(v.attributes, "src", v.attributes, true), v.scope, _fixHtml(v.child, inHtml, inHead, justHead, inBody, justBody, bodyHead, bodyTail, doMergy): _*)
case c: Comment if stripComments => NodeSeq.Empty
case _ => v
}
if (_justHead) headChildren ++= ret
else if (_justBody && !bodyHead && !bodyTail) bodyChildren ++= ret
else if (_bodyHead) addlHead ++= ret
else if (_bodyTail) addlTail ++= ret
if (bodyHead || bodyTail) Text("")
else ret
}
}
if (!hasHtmlHeadAndBody) {
val fixedHtml = _fixHtml(xhtml, false, false, false, false, false, false, false, false)
fixedHtml.find {
case e: Elem => true
case _ => false
} getOrElse Text("")
} else {
_fixHtml(xhtml, false, false, false, false, false, false, false, true)
val htmlKids = new ListBuffer[Node]
val nl = Text("\n")
for{
node <- HeadHelper.removeHtmlDuplicates(addlHead.toList)
} {
headChildren += node
headChildren += nl
}
// Appends ajax stript to body
if (LiftRules.autoIncludeAjax(this)) {
bodyChildren +=
<script src={S.encodeURL(contextPath + "/" +
LiftRules.ajaxPath +
"/" + LiftRules.ajaxScriptName())}
type="text/javascript"/>
bodyChildren += nl
}
val cometList = cometTimes.toList
// Appends comet stript reference to head
if (!cometList.isEmpty && LiftRules.autoIncludeComet(this)) {
bodyChildren +=
<script src={S.encodeURL(contextPath + "/" +
LiftRules.cometPath +
"/" + urlEncode(this.uniqueId) +
"/" + LiftRules.cometScriptName())}
type="text/javascript"/>
bodyChildren += nl
}
S.jsToAppend match {
case Nil =>
case x :: Nil => addlTail += js.JsCmds.Script(x)
case xs => addlTail += js.JsCmds.Script(xs.foldLeft(js.JsCmds.Noop)(_ & _))
}
for{
node <- HeadHelper.removeHtmlDuplicates(addlTail.toList)
} bodyChildren += node
bodyChildren += nl
if (!cometList.isEmpty && LiftRules.autoIncludeComet(this)) {
bodyChildren += JsCmds.Script(LiftRules.renderCometPageContents(this, cometList))
bodyChildren += nl
}
if (LiftRules.enableLiftGC && stateful_?) {
import js._
import JsCmds._
import JE._
bodyChildren += JsCmds.Script((if (!cometList.isEmpty || hasFuncsForOwner(RenderVersion.get)) OnLoad(JsRaw("liftAjax.lift_successRegisterGC()")) else Noop) &
JsCrVar("lift_page", RenderVersion.get))
}
htmlKids += nl
htmlKids += Elem(headTag.prefix, headTag.label, headTag.attributes, headTag.scope, headChildren.toList: _*)
htmlKids += nl
htmlKids += Elem(bodyTag.prefix, bodyTag.label, bodyTag.attributes, bodyTag.scope, bodyChildren.toList: _*)
htmlKids += nl
val tmpRet = Elem(htmlTag.prefix, htmlTag.label, htmlTag.attributes, htmlTag.scope, htmlKids.toList: _*)
val ret: Node = if (Props.devMode) {
LiftRules.xhtmlValidator.toList.flatMap(_(tmpRet)) match {
case Nil => tmpRet
case xs =>
import scala.xml.transform._
val errors: NodeSeq = xs.map(e =>
<div style="border: red solid 2px">XHTML Validation error:{e.msg}at line{e.line + 1}and column{e.col}Other Lift Framework examples (source code examples)Here is a short list of links related to this Lift Framework LiftMerge.scala source code file: |
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