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package org.specs2
package html
import io._
import scala.xml._
import transform.RewriteRule
import org.specs2.fp._, Tree._
import xml.Nodex._
import java.net.URLDecoder
import data.UniqueNames
/**
* This trait provide additional methods on a NodeSeq or a Node representing an html document
*/
trait Htmlx { outer =>
implicit class HtmlOps(ns: NodeSeq) {
def headers = outer.headers(ns)
def headersTree = outer.headersToTree(ns.headers).toTree
def addHeadersAnchors: NodeSeq =
outer.headersAnchors.rewrite(ns).reduceNodes
}
implicit class HtmlNodeOps(n: Node) {
def addHeadersAnchors: NodeSeq =
outer.headersAnchors.rewrite(n).headOption.getOrElse(NodeSeq.Empty)
}
implicit class HtmlSeqNodeOps(ns: Seq[Node]) {
def updateHead(f: PartialFunction[Node, Node]) = outer.updateHead(ns)(f)
def updateHeadAttribute(name: String, value: String): NodeSeq = outer.updateHeadAttribute(ns, name, value)
def updateHeadAttribute(name: String, value: Int): NodeSeq = outer.updateHeadAttribute(ns, name, value)
}
/** @return a NodeSeq where the first Node is updated with a partial function */
def updateHead(ns: NodeSeq)(f: PartialFunction[Node, Node]) = {
(ns.toList match {
case (e:Node) :: rest if f.isDefinedAt(e) => f(e) :: rest
case other => other
}).reduceNodes
}
/** @return a NodeSeq where the first Node attribute named 'named' has a new value */
def updateHeadAttribute(ns: NodeSeq, name: String, value: String): NodeSeq = updateHead(ns) { case (e: Elem) => e % (name -> value) }
/** @return a NodeSeq where the first Node attribute named 'named' has a new value, from an Int */
def updateHeadAttribute(ns: NodeSeq, name: String, value: Int): NodeSeq = updateHeadAttribute(ns, name, value.toString)
/**
* @return all the headers and all the subtoc elements of a document
*/
def headers(nodes: NodeSeq): NodeSeq =
nodes.filterNodes(isHeader)
/** collect all the headers as a Tree */
def headersToTree(body: NodeSeq, headers: TreeLoc[Header] = Leaf(Header()).loc): TreeLoc[Header] = {
def goUpUntil(headers: TreeLoc[Header], level: Int): TreeLoc[Header] =
if (headers.tree.rootLabel.level > level) headers.parent.map(goUpUntil(_, level)).getOrElse(headers)
else headers
lazy val currentLevel = headers.tree.rootLabel.level
def insertHeader(eLevel: Int, e: Node, rest: NodeSeq): TreeLoc[Header] = {
val header = Leaf(Header(eLevel, e, headers.getLabel.namer))
val newHeaders = if (eLevel == currentLevel)
headers.insertRight(header)
else if (eLevel > currentLevel)
headers.insertDownLast(header)
else {
val parent = goUpUntil(headers, eLevel)
if (parent.tree.rootLabel.level == 1)
parent.insertDownLast(header)
else
parent.insertRight(header)
}
headersToTree(rest, newHeaders)
}
body.toList match {
case e :: rest if isHeader(e) => insertHeader(headerNumber(e), e, rest)
case _ => headers
}
}
/** @return the header number if any. By convention -1 means "no header" */
private def headerNumber(e: Node) = {
e.label match {
case HeaderTag(i) => Integer.valueOf(i).intValue
case _ => -1
}
}
implicit class HRef(s: String) {
def sanitize: String = outer.sanitize(s)
def anchorName: String = outer.anchorName(s)
}
/** sanitize a string so that it can be used as a href */
def sanitize(s: String) = java.net.URLEncoder.encode(s, "UTF-8")
/** create a sanitized anchor name */
def anchorName(name: String) = "#"+sanitize(name)
case class Header(level: Int = 1, node: Node = new Atom("first level"), namer: UniqueNames = uniqueNamer) {
def name = nodeText(node)
def isRoot = name.isEmpty
def pandocName: String = name.toLowerCase.replace(" ", "-")
def anchorName: String = name.anchorName
def anchorName(baseUrl: String): String = createAnchorNameForNode(baseUrl + anchorName, namer)
}
implicit object HeaderShow extends Show[Header] {
override def show(h : Header) = h.name
}
/** @return the text of the first child of a Node */
def nodeText(n: Node) = {n.child}.text
/** regular expression for a Header Tag */
private val HeaderTag = "h(\\d)".r
/** @return true if the element is a header */
def isHeader(e: Node) = e.label.matches(HeaderTag.toString)
/** This rule can be used to add anchors to header elements */
def headersAnchors = {
val namer = uniqueNamer
rewriteRule {
case e: Elem if isHeader(e) => {e}
}
}
/** @return a rewrite rule that will rewrite recursively each node based on a partial function */
def rewriteRule(pf: PartialFunction[Node, Seq[Node]]) = new RewriteRule {
def applyTransformation(ns: Seq[Node]): Seq[Node] =
if (ns.isEmpty) ns
else applyTransformation(ns.head) ++ applyTransformation(ns.tail)
def applyTransformation(n: Node): Seq[Node] = n match {
case e: Node if pf.isDefinedAt(e) => pf(e)
case Group(xs) => Group(applyTransformation(xs))
case other =>
val ch = n.child
val nch = applyTransformation(ch)
if (ch eq nch) n
else Elem(n.prefix, n.label, n.attributes, n.scope, true, nch: _*)
}
def rewrite(n: NodeSeq) = applyTransformation(n)
}
/** @return a unique anchor name for that node, so that 2 nodes having the same name will not direct to the same anchor in the same page */
private def createAnchorNameForNode(text: String, namer: UniqueNames) = namer.uniqueName(text)
/** @return a unique namer adding + and an id if a name has already been used */
private def uniqueNamer = UniqueNames()
/** @return the href urls in elements */
def urls(ns: NodeSeq, filePath: FilePath = DirectoryPath.EMPTY.toFilePath): List[String] = {
def decode(href: String) = {
val split = href.split("#").toSeq
val url = filePath.dir / FilePath.unsafe(URLDecoder.decode(split(0), "UTF-8"))
val anchor = split.drop(1).lastOption.map(anchor => "#"+anchor).getOrElse("")
url.path + anchor
}
(ns \\ "a").flatMap(a => a.attribute("href").map(href => decode(href.mkString))).toList
}
}
object Htmlx extends Htmlx
