# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@apidesign.org>
# Date 1358004569 -3600
# Node ID 1bdeeb77f5a3f292a0894462f90783f253c27e76
# Parent  d859199a15b7b6d156b7e41d0cd5f6f3af442555
Processor for @JavaScriptBody annotation to warn when incorrect number of args is used and to provide code completion to generate the field

diff -r d859199a15b7 -r 1bdeeb77f5a3 core/pom.xml
--- a/core/pom.xml	Sat Jan 12 15:44:09 2013 +0100
+++ b/core/pom.xml	Sat Jan 12 16:29:29 2013 +0100
@@ -19,8 +19,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>2.3.2</version>
                 <configuration>
-                    <source>1.6</source>
-                    <target>1.6</target>
+                    <source>1.7</source>
+                    <target>1.7</target>
                 </configuration>
             </plugin>
         </plugins>
@@ -35,6 +35,10 @@
       <version>3.8.1</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.netbeans.api</groupId>
+      <artifactId>org-openide-util-lookup</artifactId>
+    </dependency>
   </dependencies>
     <description>Contains esential annotations for associating JavaScript code with
 methods and classes.</description>
diff -r d859199a15b7 -r 1bdeeb77f5a3 core/src/main/java/org/apidesign/bck2brwsr/core/impl/JavaScriptProcesor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/src/main/java/org/apidesign/bck2brwsr/core/impl/JavaScriptProcesor.java	Sat Jan 12 16:29:29 2013 +0100
@@ -0,0 +1,104 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.core.impl;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.Completion;
+import javax.annotation.processing.Completions;
+import javax.annotation.processing.Processor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ElementKind;
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.Modifier;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.element.VariableElement;
+import javax.tools.Diagnostic;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+@ServiceProvider(service = Processor.class)
+public final class JavaScriptProcesor extends AbstractProcessor {
+    @Override
+    public Set<String> getSupportedAnnotationTypes() {
+        Set<String> set = new HashSet<>();
+        set.add(JavaScriptBody.class.getName());
+        return set;
+    }
+    
+    @Override
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        for (Element e : roundEnv.getElementsAnnotatedWith(JavaScriptBody.class)) {
+            if (e.getKind() != ElementKind.METHOD) {
+                continue;
+            }
+            ExecutableElement ee = (ExecutableElement)e;
+            List<? extends VariableElement> params = ee.getParameters();
+            
+            JavaScriptBody jsb = e.getAnnotation(JavaScriptBody.class);
+            String[] arr = jsb.args();
+            int indx;
+            if (!ee.getModifiers().contains(Modifier.STATIC)) {
+                indx = 1;
+            } else {
+                indx = 0;
+            }
+            if (indx + params.size() != arr.length) {
+                processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "Number of args arguments does not match real arguments!", e);
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public Iterable<? extends Completion> getCompletions(Element e, 
+        AnnotationMirror annotation, ExecutableElement member, String userText
+    ) {
+        StringBuilder sb = new StringBuilder();
+        if (e.getKind() == ElementKind.METHOD && member.getSimpleName().contentEquals("args")) {
+            ExecutableElement ee = (ExecutableElement) e;
+            String sep;
+            if (!ee.getModifiers().contains(Modifier.STATIC)) {
+                sb.append("{ \"self\"");
+                sep = ", ";
+            } else {
+                sb.append("{ ");
+                sep = "";
+            }
+            for (VariableElement ve : ee.getParameters()) {
+                sb.append(sep).append('"').append(ve.getSimpleName())
+                    .append('"');
+                sep = ", ";
+            }
+            sb.append(" }");
+            return Collections.nCopies(1, Completions.of(sb.toString()));
+        }
+        return null;
+    }
+
+    
+}