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Selectors.scala
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Selectors.scala
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/**
* Copyright (C) 2009-2011 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* 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 org.fusesource.scalate.scuery.support
import org.fusesource.scalate.scuery.Selector
import xml.{ Elem, Node }
/**
* Matches if the CSS class attribute contains the given class name word
*/
case class ClassSelector(className: String) extends Selector {
private[this] val matcher = IncludesMatch(className)
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
e.attribute("class") match {
case Some(nodes) => matcher.matches(nodes)
case _ => false
}
case _ => false
}
}
case class IdSelector(className: String) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
attrEquals(e, "id", className)
case _ => false
}
}
case class ElementNameSelector(name: String) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
e.label == name
case _ => false
}
}
/**
* Matches the current element if it has an attribute name
*/
case class AttributeNameSelector(name: String, matcher: Matcher) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
e.attribute(name) match {
case Some(ns) => matcher.matches(ns)
case _ => false
}
case _ => false
}
}
/**
* Matches the current element if it has a namespaced attribute name
*/
case class NamespacedAttributeNameSelector(name: String, prefix: String, matcher: Matcher) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
val uri = e.scope.getURI(prefix)
if (uri != null) {
e.attribute(uri, name) match {
case Some(ns) => matcher.matches(ns)
case _ => false
}
} else {
false
}
case _ => false
}
}
case class NamespacePrefixSelector(prefix: String) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = {
// lets not compare prefixes, as we could have many prefixes mapped to the same URI
// so lets compare the URI of the node to the URI of the prefix in scope on the node
val boundUrl = node.scope.getURI(prefix)
boundUrl != null && node.namespace == boundUrl
}
}
object NoNamespaceSelector extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node.namespace == null
}
case class AnyElementSelector() extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem => true
case _ => false
}
}
case class CompositeSelector(selectors: Seq[Selector]) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = selectors.find(!_.matches(node, ancestors)).isEmpty
}
case class ChildrenSelector(selector: Selector) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = ancestors match {
case ancestor :: xs =>
selector.matches(ancestor, xs)
case _ => false
}
}
case class NotSelector(selector: Selector) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = !selector.matches(node, ancestors)
}
object AnySelector extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = true
}
object AnyElementSelector extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem => true
case _ => false
}
}
// Combinators
//-------------------------------------------------------------------------
/**
* Represents selector: E > F
*
* See the <a href"http://www.w3.org/TR/css3-selectors/#child-combinators">description</a>
*/
case class ChildSelector(childSelector: Selector, ancestorSelector: Selector) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = {
!ancestors.isEmpty && childSelector.matches(node, ancestors) && ancestorSelector.matches(ancestors.head, ancestors.tail)
}
}
/**
* Represents selector: E F
*
* See the <a href"http://www.w3.org/TR/css3-selectors/#descendant-combinators">description</a>
*/
case class DescendantSelector(childSelector: Selector, ancestorSelector: Selector) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = {
!ancestors.isEmpty && childSelector.matches(node, ancestors) && matchAncestor(ancestors.head, ancestors.tail)
}
/**
* recursively match the ancestor selector until we have no more ancestors
*/
protected def matchAncestor(node: Node, ancestors: Seq[Node]): Boolean = {
ancestorSelector.matches(node, ancestors) || (!ancestors.isEmpty && matchAncestor(ancestors.head, ancestors.tail))
}
}
/**
* Represents selector: E + F
*
* See the <a href"http://www.w3.org/TR/css3-selectors/#adjacent-sibling-combinators">description</a>
*/
case class AdjacentSiblingSelector(childSelector: Selector, ancestorSelector: Selector) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = {
if (!ancestors.isEmpty && childSelector.matches(node, ancestors)) {
// lets find immediate
// lets apply the ancestorSelector to the immediate ancestor
// find the index of node in ancestors children
val h = ancestors.head
val xs = ancestors.tail
val children = h.child
val idx = children.indexOf(node)
idx > 0 && ancestorSelector.matches(children(idx - 1), xs)
} else {
false
}
}
}
/**
* Represents selector: E ~ F
*
* See the <a href"http://www.w3.org/TR/css3-selectors/#general-sibling-combinators">description</a>
*/
case class GeneralSiblingSelector(childSelector: Selector, ancestorSelector: Selector) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = {
if (!ancestors.isEmpty && childSelector.matches(node, ancestors)) {
// lets find immediate
// lets apply the ancestorSelector to the immediate ancestor
// find the index of node in ancestors children
val h = ancestors.head
val xs = ancestors.tail
val children = h.child
val idx = children.indexOf(node)
idx > 0 && children.slice(0, idx).reverse.find(ancestorSelector.matches(_, xs)).isDefined
} else {
false
}
}
}
// Pseudo selectors
//-------------------------------------------------------------------------
object RootSelector extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
ancestors.isEmpty
case _ => false
}
}
object FirstChildSelector extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
ancestorChildElements(ancestors).headOption match {
case Some(n) => n == e
case _ => false
}
case _ => false
}
}
object LastChildSelector extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
ancestorChildElements(ancestors).lastOption match {
case Some(n) => n == e
case _ => false
}
case _ => false
}
}
case class NthChildSelector(counter: NthCounter) extends Selector {
def matches(node: Node, ancestors: Seq[Node]) = node match {
case e: Elem =>
val idx = ancestorChildElements(ancestors).indexOf(node)
counter.matches(idx)
case _ => false
}
}
/**
* Used for the <a href="http://www.w3.org/TR/css3-selectors/#nth-child-pseudo">nth</a>
* calculations representing an + b
*/
case class NthCounter(a: Int, b: Int) {
def matches(idx: Int): Boolean = {
if (idx < 0)
false
else {
val oneIdx = idx + 1
if (a == 0)
oneIdx == b
else
oneIdx % a == b
}
}
}
object OddCounter extends NthCounter(2, 1)
object EvenCounter extends NthCounter(2, 0)