Processor for @JavaScriptBody annotation to warn when incorrect number of args is used and to provide code completion to generate the field
1.1 --- a/core/pom.xml Sat Jan 12 15:44:09 2013 +0100
1.2 +++ b/core/pom.xml Sat Jan 12 16:29:29 2013 +0100
1.3 @@ -19,8 +19,8 @@
1.4 <artifactId>maven-compiler-plugin</artifactId>
1.5 <version>2.3.2</version>
1.6 <configuration>
1.7 - <source>1.6</source>
1.8 - <target>1.6</target>
1.9 + <source>1.7</source>
1.10 + <target>1.7</target>
1.11 </configuration>
1.12 </plugin>
1.13 </plugins>
1.14 @@ -35,6 +35,10 @@
1.15 <version>3.8.1</version>
1.16 <scope>test</scope>
1.17 </dependency>
1.18 + <dependency>
1.19 + <groupId>org.netbeans.api</groupId>
1.20 + <artifactId>org-openide-util-lookup</artifactId>
1.21 + </dependency>
1.22 </dependencies>
1.23 <description>Contains esential annotations for associating JavaScript code with
1.24 methods and classes.</description>
2.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
2.2 +++ b/core/src/main/java/org/apidesign/bck2brwsr/core/impl/JavaScriptProcesor.java Sat Jan 12 16:29:29 2013 +0100
2.3 @@ -0,0 +1,104 @@
2.4 +/**
2.5 + * Back 2 Browser Bytecode Translator
2.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
2.7 + *
2.8 + * This program is free software: you can redistribute it and/or modify
2.9 + * it under the terms of the GNU General Public License as published by
2.10 + * the Free Software Foundation, version 2 of the License.
2.11 + *
2.12 + * This program is distributed in the hope that it will be useful,
2.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2.15 + * GNU General Public License for more details.
2.16 + *
2.17 + * You should have received a copy of the GNU General Public License
2.18 + * along with this program. Look for COPYING file in the top folder.
2.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
2.20 + */
2.21 +package org.apidesign.bck2brwsr.core.impl;
2.22 +
2.23 +import java.util.Collections;
2.24 +import java.util.HashSet;
2.25 +import java.util.List;
2.26 +import java.util.Set;
2.27 +import javax.annotation.processing.AbstractProcessor;
2.28 +import javax.annotation.processing.Completion;
2.29 +import javax.annotation.processing.Completions;
2.30 +import javax.annotation.processing.Processor;
2.31 +import javax.annotation.processing.RoundEnvironment;
2.32 +import javax.lang.model.element.AnnotationMirror;
2.33 +import javax.lang.model.element.Element;
2.34 +import javax.lang.model.element.ElementKind;
2.35 +import javax.lang.model.element.ExecutableElement;
2.36 +import javax.lang.model.element.Modifier;
2.37 +import javax.lang.model.element.TypeElement;
2.38 +import javax.lang.model.element.VariableElement;
2.39 +import javax.tools.Diagnostic;
2.40 +import org.apidesign.bck2brwsr.core.JavaScriptBody;
2.41 +import org.openide.util.lookup.ServiceProvider;
2.42 +
2.43 +/**
2.44 + *
2.45 + * @author Jaroslav Tulach <jtulach@netbeans.org>
2.46 + */
2.47 +@ServiceProvider(service = Processor.class)
2.48 +public final class JavaScriptProcesor extends AbstractProcessor {
2.49 + @Override
2.50 + public Set<String> getSupportedAnnotationTypes() {
2.51 + Set<String> set = new HashSet<>();
2.52 + set.add(JavaScriptBody.class.getName());
2.53 + return set;
2.54 + }
2.55 +
2.56 + @Override
2.57 + public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
2.58 + for (Element e : roundEnv.getElementsAnnotatedWith(JavaScriptBody.class)) {
2.59 + if (e.getKind() != ElementKind.METHOD) {
2.60 + continue;
2.61 + }
2.62 + ExecutableElement ee = (ExecutableElement)e;
2.63 + List<? extends VariableElement> params = ee.getParameters();
2.64 +
2.65 + JavaScriptBody jsb = e.getAnnotation(JavaScriptBody.class);
2.66 + String[] arr = jsb.args();
2.67 + int indx;
2.68 + if (!ee.getModifiers().contains(Modifier.STATIC)) {
2.69 + indx = 1;
2.70 + } else {
2.71 + indx = 0;
2.72 + }
2.73 + if (indx + params.size() != arr.length) {
2.74 + processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "Number of args arguments does not match real arguments!", e);
2.75 + }
2.76 + }
2.77 + return true;
2.78 + }
2.79 +
2.80 + @Override
2.81 + public Iterable<? extends Completion> getCompletions(Element e,
2.82 + AnnotationMirror annotation, ExecutableElement member, String userText
2.83 + ) {
2.84 + StringBuilder sb = new StringBuilder();
2.85 + if (e.getKind() == ElementKind.METHOD && member.getSimpleName().contentEquals("args")) {
2.86 + ExecutableElement ee = (ExecutableElement) e;
2.87 + String sep;
2.88 + if (!ee.getModifiers().contains(Modifier.STATIC)) {
2.89 + sb.append("{ \"self\"");
2.90 + sep = ", ";
2.91 + } else {
2.92 + sb.append("{ ");
2.93 + sep = "";
2.94 + }
2.95 + for (VariableElement ve : ee.getParameters()) {
2.96 + sb.append(sep).append('"').append(ve.getSimpleName())
2.97 + .append('"');
2.98 + sep = ", ";
2.99 + }
2.100 + sb.append(" }");
2.101 + return Collections.nCopies(1, Completions.of(sb.toString()));
2.102 + }
2.103 + return null;
2.104 + }
2.105 +
2.106 +
2.107 +}