/*
* Copyright 2003-2012 the original author or authors.
*
* 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 me.champeau.deck2pdf;
import com.itextpdf.text.Document;
import groovy.lang.Binding;
import groovy.lang.Closure;
import groovy.lang.GroovyShell;
import groovy.lang.MissingPropertyException;
import javafx.scene.web.WebEngine;
import netscape.javascript.JSObject;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import org.codehaus.groovy.runtime.MethodClosure;
import java.io.Reader;
import java.util.Map;
/**
* The Groovy provide can be used for complex interactions with the web engine. The Groovy script consists
* minimally of 2 variables: totalSlides and nextSlide. The script exposes two additional variables:
* <ul>
* <li>engine, of type {@link WebEngine}</li>
* <li>js, a function that will call javascript code using the engine (shortcut for engine.executeScript()</li>
* </ul>
* For example, a deck.js profile can be written like this:
* <code>
* totalSlides = { js("\$.deck('getSlides').length") }
* nextSlide = { js("\$.deck('next')") }
* </code>
*/
public class GroovyProfile extends Profile {
private final Binding binding;
protected GroovyProfile(final WebEngine engine, final Map<String,?> options, final Reader script) {
super(engine, options);
binding = new NullBinding();
binding.setVariable("engine", engine);
binding.setVariable("js", new MethodClosure(this, "executeJS"));
binding.setVariable("options", options);
new GroovyShell(binding).evaluate(script);
}
public Object getVariable(final String name) {
return binding.getVariable(name);
}
public void setVariable(final String name, final Object value) {
binding.setVariable(name, value);
}
public Object executeJS(String code) {
try {
return engine.executeScript(code);
} catch (netscape.javascript.JSException e) {
System.err.println("Error while executing the following code:");
System.err.println(code);
throw e;
}
}
@Override
public void setDocument(final Document document) {
super.setDocument(document);
binding.setVariable("document", document);
}
@Override
@SuppressWarnings("unchecked")
public boolean isLastSlide(final int slideIdx) {
Closure<Boolean> fun = (Closure<Boolean>) binding.getVariable("isLastSlide");
if (fun==null) {
return getSlideCount()==slideIdx;
}
return fun.call();
}
@Override
public void nextSlide() {
((Closure)binding.getVariable("nextSlide")).call();
}
@Override
public int getPause() {
Object pause = binding.getVariable("pause");
if (pause==null) {
return super.getPause();
} else if (pause instanceof Closure) {
return (Integer)((Closure)pause).call();
} else if (pause instanceof Integer) {
return (Integer) pause;
} else {
throw new RuntimeException("'pause' function returned an unexpected value");
}
}
@Override
@SuppressWarnings("unchecked")
public int getSlideCount() {
Closure<Integer> fun = (Closure<Integer>) binding.getVariable("totalSlides");
if (fun==null){
return super.getSlideCount();
}
return fun.call();
}
@Override
public void setup() {
prepareEngine();
Closure fun = (Closure) binding.getVariable("setup");
if (fun!=null){
fun.call();
}
}
private void prepareEngine() {
JSObject window = (JSObject) engine.executeScript("window");
window.setMember("exportProfile", this);
// uncomment this for debugging
// engine.executeScript("if (!document.getElementById('FirebugLite')){E = document['createElement' + 'NS'] && document.documentElement.namespaceURI;E = E ? document['createElement' + 'NS'](E, 'script') : document['createElement']('script');E['setAttribute']('id', 'FirebugLite');E['setAttribute']('src', 'https://getfirebug.com/' + 'firebug-lite.js' + '#startOpened');E['setAttribute']('FirebugLite', '4');(document['getElementsByTagName']('head')[0] || document['getElementsByTagName']('body')[0]).appendChild(E);E = new Image;E['setAttribute']('src', 'https://getfirebug.com/' + '#startOpened');}");
}
@Override
public void finish() {
Closure fun = (Closure) binding.getVariable("finish");
if (fun!=null){
fun.call();
}
}
@Override
public void ready(Runnable r) {
Closure fun = (Closure) binding.getVariable("ready");
if (fun!=null){
fun.call(r);
} else {
super.ready(r);
}
}
private static class NullBinding extends Binding {
@Override
public Object getVariable(final String name) {
Object variable = null;
try {
variable = super.getVariable(name);
} catch (MissingPropertyException e) {
return null;
}
return variable;
}
}
}