com.google.gwt.query.rebind.SelectorGeneratorCssToXPath Maven / Gradle / Ivy
/*
* 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.rebind;
import java.util.ArrayList;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.query.client.Selector;
import com.google.gwt.query.client.impl.SelectorEngineCssToXPath;
import com.google.gwt.query.client.impl.SelectorEngineCssToXPath.ReplaceCallback;
import com.google.gwt.query.client.impl.SelectorEngineCssToXPath.Replacer;
import com.google.gwt.user.rebind.SourceWriter;
/**
* Compile time selector generator which translates selector into XPath at
* compile time. It Uses the SelectorEngineCssToXpath to produce the xpath
* selectors
*/
public class SelectorGeneratorCssToXPath extends SelectorGeneratorBase {
/**
* The replacer implementation for the JVM.
*/
public static final Replacer replacer = new Replacer() {
public String replaceAll(String s, String r, Object o) {
Pattern p = Pattern.compile(r);
if (o instanceof ReplaceCallback) {
final Matcher matcher = p.matcher(s);
ReplaceCallback callback = (ReplaceCallback) o;
while (matcher.find()) {
final MatchResult matchResult = matcher.toMatchResult();
ArrayList argss = new ArrayList();
for (int i = 0; i < matchResult.groupCount() + 1; i++) {
argss.add(matchResult.group(i));
}
final String replacement = callback.foundMatch(argss);
s = s.substring(0, matchResult.start()) + replacement
+ s.substring(matchResult.end());
matcher.reset(s);
}
return s;
} else {
return p.matcher(s).replaceAll(o.toString());
}
}
};
private SelectorEngineCssToXPath engine = new SelectorEngineCssToXPath(
replacer);
protected String css2Xpath(String s) {
return engine.css2Xpath(s);
}
private XPathFactory factory = XPathFactory.newInstance();
private XPath xpath = factory.newXPath();
protected void generateMethodBody(SourceWriter sw, JMethod method,
TreeLogger treeLogger, boolean hasContext)
throws UnableToCompleteException {
String selector = method.getAnnotation(Selector.class).value();
String xselector = css2Xpath(selector);
// Validate the generated xpath selector.
try {
validateXpath(xselector);
} catch (XPathExpressionException e1) {
System.err.println("Invalid XPath generated selector, please revise it: " + xselector);
if (!selector.equals(xselector)) {
System.err.println("If your css2 selector syntax is correct, open an issue in the gwtquery project. cssselector:"
+ selector + " xpath:" + xselector);
}
throw new UnableToCompleteException();
}
sw.println("return "
+ wrap(method, "xpathEvaluate(\"" + xselector + "\", root)") + ";");
}
public void validateXpath(String xselector) throws XPathExpressionException {
xpath.compile(xselector);
}
protected String getImplSuffix() {
return "CssToXPath" + super.getImplSuffix();
}
}