/*
* Copyright 2011, The gwtquery team.
*
* 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 com.google.gwt.query.client.impl;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.query.client.Predicate;
import com.google.gwt.query.client.js.JsMap;
import com.google.gwt.query.client.js.JsNodeArray;
import com.google.gwt.query.client.js.JsUtils;
import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;
/**
* Core Selector engine functions, and native JS utility functions.
*/
public class SelectorEngine implements HasSelector {
private static DocumentStyleImpl styleImpl;
public static native NodeList<Element> getElementsByClassName(String clazz,
Node ctx) /*-{
return ctx.getElementsByClassName(clazz);
}-*/;
public static native Node getNextSibling(Node n) /*-{
return n.nextSibling || null;
}-*/;
public static native Node getPreviousSibling(Node n) /*-{
return n.previousSibling || null;
}-*/;
public NodeList<Element> querySelectorAll(String selector, Node ctx) {
if (!hasQuerySelector) {
return impl.select(selector, ctx);
}
try {
return querySelectorAllImpl(selector, ctx);
} catch (Exception e) {
return impl.select(selector, ctx);
}
}
public static native NodeList<Element> querySelectorAllImpl(String selector,
Node ctx) /*-{
return ctx.querySelectorAll(selector);
}-*/;
public static native NodeList<Element> elementsByTagName(String selector,
Node ctx) /*-{
return ctx.getElementsByTagName(selector);
}-*/;
public static native NodeList<Element> elementsByClassName(String selector,
Node ctx) /*-{
return ctx.getElementsByClassName(selector);
}-*/;
public static NodeList<Element> veryQuickId(String id, Node ctx) {
Document d = ctx.getNodeType() == Node.DOCUMENT_NODE
? ctx.<Document> cast() : ctx.getOwnerDocument();
return JsNodeArray.create(d.getElementById(id));
}
public static NodeList<Element> xpathEvaluate(String selector, Node ctx) {
return xpathEvaluate(selector, ctx, JsNodeArray.create());
}
public static native NodeList<Element> xpathEvaluate(String selector,
Node ctx, JsNodeArray r) /*-{
var node;
var ownerDoc = ctx && (ctx.ownerDocument || ctx );
var evalDoc = ownerDoc ? ownerDoc : $doc;
var result = evalDoc.evaluate(selector, ctx, null, 0, null);
while ((node = result.iterateNext())) {
r.push(node);
}
return r;
}-*/;
public final SelectorEngineImpl impl;
protected Node root = Document.get();
public static final boolean hasQuerySelector = hasQuerySelectorAll();
public static JsMap<String, Predicate> filters;
static {
filters = JsMap.create();
filters.put("visible", new Predicate(){
public boolean f(Element e, int index) {
return (e.getOffsetWidth() + e.getOffsetHeight()) > 0 && styleImpl.isVisible(e);
}
});
filters.put("hidden", new Predicate() {
public boolean f(Element e, int index) {
return !filters.get("visible").f(e, index);
}
});
filters.put("selected", new Predicate() {
public boolean f(Element e, int index) {
return e.getPropertyBoolean("selected");
}
});
filters.put("input", new Predicate(){
public boolean f(Element e, int index) {
return e.getNodeName().toLowerCase().matches("input|select|textarea|button");
}
});
filters.put("header", new Predicate(){
public boolean f(Element e, int index) {
return e.getNodeName().toLowerCase().matches("h\\d");
}
});
}
public SelectorEngine() {
impl = (SelectorEngineImpl) GWT.create(SelectorEngineImpl.class);
GWT.log("GQuery - Created SelectorEngineImpl: " + impl.getClass().getName());
styleImpl = GWT.create(DocumentStyleImpl.class);
GWT.log("GQuery - Created DocumentStyleImpl: " + styleImpl.getClass().getName());
}
public Node getRoot() {
return root;
}
public NodeList<Element> filter(NodeList<Element> nodes, Predicate p) {
JsNodeArray res = JsNodeArray.create();
for (int i = 0, l = nodes.getLength(), j = 0; i < l; i++) {
Element e = nodes.getItem(i);
if (p.f(e, i)) {
res.addNode(e, j++);
}
}
return res;
}
// pseudo selectors which are computed by gquery in runtime
RegExp gQueryPseudo = RegExp.compile("(.*):((visible|hidden|selected|input|header)|((button|checkbox|file|hidden|image|password|radio|reset|submit|text)\\s*(,|$)))(.*)", "i");
// pseudo selectors which work in engine
RegExp nativePseudo = RegExp.compile("(.*):([\\w]+):(disabled|checked|enabled|empty|focus)\\s*([:,].*|$)", "i");
public NodeList<Element> select(String selector, Node ctx) {
if (nativePseudo.test(selector)) {
// move gQuery filters at the end to improve performance, and deal with issue #220
MatchResult r;
while ((r = nativePseudo.exec(selector)) != null) {
selector = r.getGroup(1) + ":" + r.getGroup(3);
if (!r.getGroup(3).equals(r.getGroup(2))) {
selector += ":" + r.getGroup(2);
}
selector += r.getGroup(4);
}
}
if (gQueryPseudo.test(selector)) {
JsNodeArray res = JsNodeArray.create();
for (String s : selector.trim().split("\\s*,\\s*")) {
NodeList<Element> nodes;
MatchResult a = gQueryPseudo.exec(s);
if (a != null) {
String select = a.getGroup(1).isEmpty() ? "*" : a.getGroup(1);
String pseudo = a.getGroup(2);
Predicate pred = filters.get(pseudo.toLowerCase());
if (pred != null) {
nodes = filter(select(select, ctx), pred);
} else if (nativePseudo.test(pseudo)) {
nodes = select(select, ctx);
} else {
nodes = select(select + "[type=" + pseudo + "]", ctx);
}
} else {
nodes = select(s, ctx);
}
JsUtils.copyNodeList(res, nodes, false);
}
return res.<NodeList<Element>> cast();
} else {
return impl.select(selector, ctx);
}
}
public native boolean contains(Element a, Element b) /*-{
return a.contains ? a != b && a.contains(b) : !!(a.compareDocumentPosition(b) & 16)
}-*/;
public void setRoot(Node root) {
assert root != null;
this.root = root;
}
public String getName() {
return getClass().getName().replaceAll("^.*\\.", "");
}
public boolean isDegradated() {
return !hasQuerySelector;
}
/**
* Check if the browser has native support for css selectors
*/
public static native boolean hasQuerySelectorAll() /*-{
return $doc.location.href.indexOf("_force_no_native") < 0 &&
$doc.querySelectorAll &&
/native/.test(String($doc.querySelectorAll)) ? true : false;
}-*/;
public static native boolean hasXpathEvaluate() /*-{
return $doc.evaluate ? true : false;
}-*/;
}