Adds initial source code of plugin to support html4j

pom.xml

@@ -34,4 +34,13 @@
       </plugin>
     </plugins>
   </build>
+
+  <profiles>
+    <profile>
+      <id>enable-html4j-support</id>
+      <modules>
+        <module>teavm-html4j</module>
+      </modules>
+    </profile>
+  </profiles>
 </project>

teavm-html4j/.gitignore

@@ -0,0 +1,5 @@
+/target
+/.settings
+/.classpath
+/.factorypath
+/.project

teavm-html4j/pom.xml

@@ -0,0 +1,101 @@
+<!--
+    Copyright 2014 Alexey Andreev.
+
+    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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.teavm</groupId>
+    <artifactId>teavm</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+  </parent>
+  <artifactId>teavm-html4j</artifactId>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.teavm</groupId>
+      <artifactId>teavm-core</artifactId>
+      <version>0.0.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.teavm</groupId>
+      <artifactId>teavm-classlib</artifactId>
+      <version>0.0.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.netbeans.html</groupId>
+      <artifactId>net.java.html.boot</artifactId>
+      <version>0.8-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.teavm</groupId>
+        <artifactId>teavm-maven-plugin</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <executions>
+          <execution>
+            <id>generate-javascript-tests</id>
+            <goals>
+              <goal>build-junit</goal>
+            </goals>
+            <phase>process-test-classes</phase>
+            <configuration>
+              <minifying>false</minifying>
+              <numThreads>1</numThreads>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+    <pluginManagement>
+      <plugins>
+        <!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
+        <plugin>
+          <groupId>org.eclipse.m2e</groupId>
+          <artifactId>lifecycle-mapping</artifactId>
+          <version>1.0.0</version>
+          <configuration>
+            <lifecycleMappingMetadata>
+              <pluginExecutions>
+                <pluginExecution>
+                  <pluginExecutionFilter>
+                    <groupId>org.teavm</groupId>
+                    <artifactId>teavm-maven-plugin</artifactId>
+                    <versionRange>[0.0.1-SNAPSHOT,)</versionRange>
+                    <goals>
+                      <goal>build-junit</goal>
+                    </goals>
+                  </pluginExecutionFilter>
+                  <action>
+                    <ignore></ignore>
+                  </action>
+                </pluginExecution>
+              </pluginExecutions>
+            </lifecycleMappingMetadata>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>

teavm-html4j/src/main/java/org/teavm/html4j/HTML4JPlugin.java

@@ -0,0 +1,31 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  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.teavm.html4j;
+
+import org.teavm.javascript.JavascriptBuilderHost;
+import org.teavm.javascript.JavascriptBuilderPlugin;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class HTML4JPlugin implements JavascriptBuilderPlugin {
+    @Override
+    public void install(JavascriptBuilderHost host) {
+        host.add(new JavaScriptBodyDependency());
+        host.add(new JavaScriptBodyTransformer());
+    }
+}

teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyDependency.java

@@ -0,0 +1,129 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  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.teavm.html4j;
+
+import net.java.html.js.JavaScriptBody;
+import org.teavm.dependency.*;
+import org.teavm.model.*;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class JavaScriptBodyDependency implements DependencyListener {
+    private DependencyNode allClassesNode;
+
+    @Override
+    public void started(DependencyChecker dependencyChecker) {
+        allClassesNode = dependencyChecker.createNode();
+    }
+
+    @Override
+    public void classAchieved(DependencyChecker dependencyChecker, String className) {
+        allClassesNode.propagate(className);
+    }
+
+    @Override
+    public void methodAchieved(DependencyChecker dependencyChecker, MethodReference methodRef) {
+        ClassHolder cls = dependencyChecker.getClassSource().get(methodRef.getClassName());
+        MethodHolder method = cls.getMethod(methodRef.getDescriptor());
+        AnnotationReader annot = method.getAnnotations().get(JavaScriptBody.class.getName());
+        if (annot != null) {
+            AnnotationValue javacall = annot.getValue("javacall");
+            MethodGraph graph = dependencyChecker.attachMethodGraph(methodRef);
+            if (graph.getResult() != null) {
+                allClassesNode.connect(graph.getResult());
+            }
+            if (javacall != null && javacall.getBoolean()) {
+                String body = annot.getValue("body").getString();
+                new GeneratorJsCallback(dependencyChecker.getClassSource(), dependencyChecker).parse(body);
+            }
+        }
+    }
+
+    @Override
+    public void fieldAchieved(DependencyChecker dependencyChecker, FieldReference field) {
+    }
+
+    private static MethodReader findMethod(ClassReaderSource classSource, String clsName, MethodDescriptor desc) {
+        while (clsName != null) {
+            ClassReader cls = classSource.get(clsName);
+            for (MethodReader method : cls.getMethods()) {
+                if (method.getName().equals(desc.getName()) && sameParams(method.getDescriptor(), desc)) {
+                    return method;
+                }
+            }
+            clsName = cls.getParent();
+        }
+        return null;
+    }
+    private static boolean sameParams(MethodDescriptor a, MethodDescriptor b) {
+        if (a.parameterCount() != b.parameterCount()) {
+            return false;
+        }
+        for (int i = 0; i < a.parameterCount(); ++i) {
+            if (!a.parameterType(i).equals(b.parameterType(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private class GeneratorJsCallback extends JsCallback {
+        private ClassReaderSource classSource;
+        private DependencyChecker dependencyChecker;
+        public GeneratorJsCallback(ClassReaderSource classSource, DependencyChecker dependencyChecker) {
+            this.classSource = classSource;
+            this.dependencyChecker = dependencyChecker;
+        }
+        @Override protected CharSequence callMethod(String ident, String fqn, String method, String params) {
+            MethodDescriptor desc = MethodDescriptor.parse(method + "V");
+            MethodReader reader = findMethod(classSource, fqn, desc);
+            if (reader != null) {
+                if (reader.hasModifier(ElementModifier.STATIC) || reader.hasModifier(ElementModifier.FINAL)) {
+                    MethodGraph graph = dependencyChecker.attachMethodGraph(reader.getReference());
+                    for (int i = 0; i <= graph.getParameterCount(); ++i) {
+                        allClassesNode.connect(graph.getVariable(i));
+                    }
+                } else {
+                    allClassesNode.addConsumer(new VirtualCallbackConsumer(classSource, dependencyChecker, desc));
+                }
+            }
+            return "";
+        }
+    }
+
+    private class VirtualCallbackConsumer implements DependencyConsumer {
+        private ClassReaderSource classSource;
+        private DependencyChecker dependencyChecker;
+        private MethodDescriptor desc;
+        public VirtualCallbackConsumer(ClassReaderSource classSource, DependencyChecker dependencyChecker,
+                MethodDescriptor desc) {
+            this.classSource = classSource;
+            this.dependencyChecker = dependencyChecker;
+            this.desc = desc;
+        }
+        @Override public void consume(String type) {
+            MethodReader reader = findMethod(classSource, type, desc);
+            if (reader != null) {
+                MethodGraph graph = dependencyChecker.attachMethodGraph(reader.getReference());
+                for (int i = 0; i <= graph.getParameterCount(); ++i) {
+                    allClassesNode.connect(graph.getVariable(i));
+                }
+            }
+        }
+    }
+}

teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyGenerator.java

@@ -0,0 +1,108 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  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.teavm.html4j;
+
+import java.io.IOException;
+import java.util.List;
+import net.java.html.js.JavaScriptBody;
+import org.teavm.codegen.NamingStrategy;
+import org.teavm.codegen.SourceWriter;
+import org.teavm.javascript.ni.Generator;
+import org.teavm.javascript.ni.GeneratorContext;
+import org.teavm.model.*;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class JavaScriptBodyGenerator implements Generator {
+    @Override
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+        MethodReader method = context.getClassSource().get(methodRef.getClassName())
+                .getMethod(methodRef.getDescriptor());
+        AnnotationReader annot = method.getAnnotations().get(JavaScriptBody.class.getName());
+        String body = annot.getValue("body").getString();
+        List<AnnotationValue> args = annot.getValue("args").getList();
+        AnnotationValue javacall = annot.getValue("javacall");
+        if (javacall != null && javacall.getBoolean()) {
+            GeneratorJsCallback callbackGen = new GeneratorJsCallback(context.getClassSource(), writer.getNaming());
+            body = callbackGen.parse(body);
+        }
+        writer.append("return (function(");
+        for (int i = 0; i < args.size(); ++i) {
+            if (i > 0) {
+                writer.append(",").ws();
+            }
+            writer.append(args.get(i).getString());
+        }
+        writer.append(")").ws().append("{").indent().softNewLine();
+        writer.append(body).softNewLine();
+        writer.outdent().append("}).call(").append(context.getParameterName(0));
+        for (int i = 0; i < args.size(); ++i) {
+            writer.append(",").ws();
+            writer.append(context.getParameterName(i + 1));
+        }
+        writer.append(");");
+    }
+
+    private static class GeneratorJsCallback extends JsCallback {
+        private ClassReaderSource classSource;
+        private NamingStrategy naming;
+        public GeneratorJsCallback(ClassReaderSource classSource, NamingStrategy naming) {
+            this.classSource = classSource;
+            this.naming = naming;
+        }
+        @Override protected CharSequence callMethod(String ident, String fqn, String method, String params) {
+            MethodDescriptor desc = MethodDescriptor.parse(method + "V");
+            MethodReader reader = findMethod(fqn, desc);
+            StringBuilder sb = new StringBuilder();
+            String name = naming.getNameFor(naming.getNameFor(reader.getReference()));
+            if (ident != null) {
+                if (reader.hasModifier(ElementModifier.FINAL)) {
+                    sb.append(name).append("(").append(ident).append(",").append(params.substring(1));
+                } else {
+                    sb.append(ident).append('.').append(name).append(params);
+                }
+            } else {
+                sb.append("(").append(ident).append(",").append(params.substring(1));
+            }
+            return sb.toString();
+        }
+        private MethodReader findMethod(String clsName, MethodDescriptor desc) {
+            while (clsName != null) {
+                ClassReader cls = classSource.get(clsName);
+                for (MethodReader method : cls.getMethods()) {
+                    if (method.getName().equals(desc.getName()) && sameParams(method.getDescriptor(), desc)) {
+                        return method;
+                    }
+                }
+                clsName = cls.getParent();
+            }
+            return null;
+        }
+        private boolean sameParams(MethodDescriptor a, MethodDescriptor b) {
+            if (a.parameterCount() != b.parameterCount()) {
+                return false;
+            }
+            for (int i = 0; i < a.parameterCount(); ++i) {
+                if (!a.parameterType(i).equals(b.parameterType(i))) {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+}

teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyTransformer.java

@@ -0,0 +1,38 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  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.teavm.html4j;
+
+import net.java.html.js.JavaScriptBody;
+import org.teavm.javascript.ni.GeneratedBy;
+import org.teavm.model.*;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class JavaScriptBodyTransformer implements ClassHolderTransformer {
+    @Override
+    public void transformClass(ClassHolder cls, ClassReaderSource innerSource) {
+        for (MethodHolder method : cls.getMethods()) {
+            if (method.getAnnotations().get(JavaScriptBody.class.getName()) != null) {
+                AnnotationHolder genAnnot = new AnnotationHolder(GeneratedBy.class.getName());
+                genAnnot.getValues().put("value", new AnnotationValue(ValueType.object(
+                        JavaScriptBodyGenerator.class.getName())));
+                method.getAnnotations().add(genAnnot);
+            }
+        }
+    }
+}

teavm-html4j/src/main/java/org/teavm/html4j/JsCallback.java

@@ -0,0 +1,174 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  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.
+ */
+/**
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.
+ *
+ * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
+ * Other names may be trademarks of their respective owners.
+ *
+ * The contents of this file are subject to the terms of either the GNU
+ * General Public License Version 2 only ("GPL") or the Common
+ * Development and Distribution License("CDDL") (collectively, the
+ * "License"). You may not use this file except in compliance with the
+ * License. You can obtain a copy of the License at
+ * http://www.netbeans.org/cddl-gplv2.html
+ * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
+ * specific language governing permissions and limitations under the
+ * License.  When distributing the software, include this License Header
+ * Notice in each file and include the License file at
+ * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the GPL Version 2 section of the License file that
+ * accompanied this code. If applicable, add the following below the
+ * License Header, with the fields enclosed by brackets [] replaced by
+ * your own identifying information:
+ * "Portions Copyrighted [year] [name of copyright owner]"
+ *
+ * Contributor(s):
+ *
+ * The Original Software is NetBeans. The Initial Developer of the Original
+ * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.
+ *
+ * If you wish your version of this file to be governed by only the CDDL
+ * or only the GPL Version 2, indicate your decision by adding
+ * "[Contributor] elects to include this software in this distribution
+ * under the [CDDL or GPL Version 2] license." If you do not indicate a
+ * single choice of license, a recipient has the option to distribute
+ * your version of this file under either the CDDL, the GPL Version 2 or
+ * to extend the choice of license to its licensees as provided above.
+ * However, if you add GPL Version 2 code and therefore, elected the GPL
+ * Version 2 license, then the option applies only if the new code is
+ * made subject to such option by the copyright holder.
+ */
+package org.teavm.html4j;
+
+/**
+*
+* @author Jaroslav Tulach <jtulach@netbeans.org>
+*/
+abstract class JsCallback {
+   final String parse(String body) {
+       StringBuilder sb = new StringBuilder();
+       int pos = 0;
+       for (;;) {
+           int next = body.indexOf(".@", pos);
+           if (next == -1) {
+               sb.append(body.substring(pos));
+               body = sb.toString();
+               break;
+           }
+           int ident = next;
+           while (ident > 0) {
+               if (!Character.isJavaIdentifierPart(body.charAt(--ident))) {
+                   ident++;
+                   break;
+               }
+           }
+           String refId = body.substring(ident, next);
+
+           sb.append(body.substring(pos, ident));
+
+           int sigBeg = body.indexOf('(', next);
+           int sigEnd = body.indexOf(')', sigBeg);
+           int colon4 = body.indexOf("::", next);
+           if (sigBeg == -1 || sigEnd == -1 || colon4 == -1) {
+               throw new IllegalStateException(
+                   "Wrong format of instance callback. "
+                   + "Should be: 'inst.@pkg.Class::method(Ljava/lang/Object;)(param)':\n"
+                   + body
+               );
+           }
+           String fqn = body.substring(next + 2, colon4);
+           String method = body.substring(colon4 + 2, sigBeg);
+           String params = body.substring(sigBeg, sigEnd + 1);
+
+           int paramBeg = body.indexOf('(', sigEnd + 1);
+           if (paramBeg == -1) {
+               throw new IllegalStateException(
+                   "Wrong format of instance callback. "
+                   + "Should be: 'inst.@pkg.Class::method(Ljava/lang/Object;)(param)':\n"
+                   + body
+               );
+           }
+
+           sb.append(callMethod(refId, fqn, method, params));
+           if (body.charAt(paramBeg + 1) != (')')) {
+               sb.append(",");
+           }
+           pos = paramBeg + 1;
+       }
+       pos = 0;
+       sb = null;
+       for (;;) {
+           int next = body.indexOf("@", pos);
+           if (next == -1) {
+               if (sb == null) {
+                   return body;
+               }
+               sb.append(body.substring(pos));
+               return sb.toString();
+           }
+           if (sb == null) {
+               sb = new StringBuilder();
+           }
+
+           sb.append(body.substring(pos, next));
+
+           int sigBeg = body.indexOf('(', next);
+           int sigEnd = body.indexOf(')', sigBeg);
+           int colon4 = body.indexOf("::", next);
+           if (sigBeg == -1 || sigEnd == -1 || colon4 == -1) {
+               throw new IllegalStateException(
+                   "Wrong format of static callback. "
+                   + "Should be: '@pkg.Class::staticMethod(Ljava/lang/Object;)(param)':\n"
+                   + body
+               );
+           }
+           String fqn = body.substring(next + 1, colon4);
+           String method = body.substring(colon4 + 2, sigBeg);
+           String params = body.substring(sigBeg, sigEnd + 1);
+
+           int paramBeg = body.indexOf('(', sigEnd + 1);
+
+           sb.append(callMethod(null, fqn, method, params));
+           pos = paramBeg + 1;
+       }
+   }
+
+   protected abstract CharSequence callMethod(
+       String ident, String fqn, String method, String params
+   );
+
+   static String mangle(String fqn, String method, String params) {
+       if (params.startsWith("(")) {
+           params = params.substring(1);
+       }
+       if (params.endsWith(")")) {
+           params = params.substring(0, params.length() - 1);
+       }
+       return
+           replace(fqn) + "$" + replace(method) + "$" + replace(params);
+   }
+
+   private static String replace(String orig) {
+       return orig.replace("_", "_1").
+           replace(";", "_2").
+           replace("[", "_3").
+           replace('.', '_').replace('/', '_');
+   }
+}

teavm-html4j/src/main/resources/META-INF/services/org.teavm.javascript.JavascriptBuilderPlugin

@@ -0,0 +1 @@
+org.teavm.html4j.HTML4JPlugin

teavm-html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTests.java

@@ -0,0 +1,51 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  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.teavm.html4j.test;
+
+import static org.junit.Assert.*;
+import net.java.html.js.JavaScriptBody;
+import org.junit.Test;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class JavaScriptBodyTests {
+    @Test
+    public void javaScriptBodyHandled() {
+        assertEquals(23, simpleNativeMethod());
+    }
+
+    @JavaScriptBody(args = {}, body = "return 23;")
+    private native int simpleNativeMethod();
+
+    @Test
+    public void dependencyPropagated() {
+        A a = (A)returnValuePassed(new AImpl());
+        assertEquals(23, a.foo());
+    }
+
+    private static interface A {
+        public int foo();
+    }
+    private static class AImpl implements A {
+        @Override public int foo() {
+            return 23;
+        }
+    }
+    @JavaScriptBody(args = { "value" }, body = "return value;")
+    private native Object returnValuePassed(Object value);
+}

teavm-jso/pom.xml

@@ -23,7 +23,7 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xs
     <version>0.0.1-SNAPSHOT</version>
   </parent>
   <artifactId>teavm-jso</artifactId>
-  
+
   <dependencies>
     <dependency>
       <groupId>org.teavm</groupId>