--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/sample/nashorn/javaastviewer.js Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,202 @@
+#// Usage: jjs -fx javaastviewer.js -- <.java files>
+
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of Oracle nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// This example demonstrates Java subclassing by Java.extend
+// and javac Compiler and Tree API. This example also uses
+// -fx and javafx TreeView to visualize Java AST as TreeView
+
+if (!$OPTIONS._fx || arguments.length == 0) {
+ print("Usage: jjs -fx javaastviewer.js -- <.java files>");
+ exit(1);
+}
+
+// Java types used
+var Enum = Java.type("java.lang.Enum");
+var HashSet = Java.type("java.util.HashSet");
+var Name = Java.type("javax.lang.model.element.Name");
+var List = Java.type("java.util.List");
+var Set = Java.type("java.util.Set");
+var SimpleTreeVisitor = Java.type("com.sun.source.util.SimpleTreeVisitor");
+var StringArray = Java.type("java.lang.String[]");
+var ToolProvider = Java.type("javax.tools.ToolProvider");
+var Tree = Java.type("com.sun.source.tree.Tree");
+
+function javaASTToScriptObject(args) {
+ // properties ignored (javac implementation class properties) in AST view.
+ // may not be exhaustive - any getAbc would become "abc" property or
+ // public field becomes a property of same name.
+ var ignoredProps = new HashSet();
+ for each (var word in
+ ['extending', 'implementing', 'init', 'mods', 'clazz', 'defs',
+ 'expr', 'tag', 'preferredPosition', 'qualid', 'recvparam',
+ 'restype', 'params', 'startPosition', 'thrown',
+ 'tree', 'typarams', 'typetag', 'vartype']) {
+ ignoredProps.add(word);
+ }
+
+ // get the system compiler tool
+ var compiler = ToolProvider.systemJavaCompiler;
+
+ // get standard file manager
+ var fileMgr = compiler.getStandardFileManager(null, null, null);
+
+ // make a list of compilation unit from command line argument file names
+ // Using Java.to convert script array (arguments) to a Java String[]
+ var compUnits = fileMgr.getJavaFileObjects(Java.to(args, StringArray));
+
+ // create a new compilation task
+ var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
+
+ // subclass SimpleTreeVisitor - converts Java AST node to
+ // a simple script object by walking through it
+ var ConverterVisitor = Java.extend(SimpleTreeVisitor);
+
+ var visitor = new ConverterVisitor() {
+ // convert java AST node to a friendly script object
+ // which can be viewed. Every node ends up in defaultAction
+ // method of SimpleTreeVisitor method.
+
+ defaultAction: function (node, p) {
+ var resultObj = {};
+ // Nashorn does not iterate properties and methods of Java objects
+ // But, we can bind properties of any object (including java objects)
+ // to a script object and iterate it!
+ var obj = {};
+ Object.bindProperties(obj, node);
+
+ // we don't want every property, method of java object
+ for (var prop in obj) {
+ var val = obj[prop];
+ var type = typeof val;
+ // ignore 'method' members
+ if (type == 'function' || type == 'undefined') {
+ continue;
+ }
+
+ // ignore properties from Javac implementation
+ // classes - hack by name!!
+ if (ignoredProps.contains(prop)) {
+ continue;
+ }
+
+ // subtree - recurse it
+ if (val instanceof Tree) {
+ resultObj[prop] = visitor.visit(val, p);
+ } else if (val instanceof List) {
+ // List of trees - recurse each and make an array
+ var len = val.size();
+ if (len != 0) {
+ var arr = [];
+ for (var j = 0; j < len; j++) {
+ var e = val[j];
+ if (e instanceof Tree) {
+ arr.push(visitor.visit(e, p));
+ }
+ }
+ resultObj[prop] = arr;
+ }
+ } else if (val instanceof Set) {
+ // Set - used for modifier flags
+ // make array
+ var len = val.size();
+ if (len != 0) {
+ var arr = [];
+ for each (var e in val) {
+ if (e instanceof Enum || typeof e == 'string') {
+ arr.push(e.toString());
+ }
+ }
+ resultObj[prop] = arr;
+ }
+ } else if (val instanceof Enum || val instanceof Name) {
+ // make string for any Enum or Name
+ resultObj[prop] = val.toString();
+ } else if (type != 'object') {
+ // primitives 'as is'
+ resultObj[prop] = val;
+ }
+ }
+ return resultObj;
+ }
+ }
+
+ // top level object with one property for each compilation unit
+ var scriptObj = {};
+ for each (var cu in task.parse()) {
+ scriptObj[cu.sourceFile.name] = cu.accept(visitor, null);
+ }
+
+ return scriptObj;
+}
+
+// JavaFX classes used
+var StackPane = Java.type("javafx.scene.layout.StackPane");
+var Scene = Java.type("javafx.scene.Scene");
+var TreeItem = Java.type("javafx.scene.control.TreeItem");
+var TreeView = Java.type("javafx.scene.control.TreeView");
+
+// Create a javafx TreeItem to view a script object
+function treeItemForObject(obj, name) {
+ var item = new TreeItem(name);
+ for (var prop in obj) {
+ var node = obj[prop];
+ if (typeof node == 'object') {
+ if (node == null) {
+ // skip nulls
+ continue;
+ }
+ var subitem = treeItemForObject(node, prop);
+ } else {
+ var subitem = new TreeItem(prop + ": " + node);
+ }
+ item.children.add(subitem);
+ }
+
+ item.expanded = true;
+ return item;
+}
+
+var commandArgs = arguments;
+
+// JavaFX start method
+function start(stage) {
+ var obj = javaASTToScriptObject(commandArgs);
+ stage.title = "Java AST Viewer"
+ var rootItem = treeItemForObject(obj, "AST");
+ rootItem.expanded = true;
+ var tree = new TreeView(rootItem);
+ var root = new StackPane();
+ root.children.add(tree);
+ stage.scene = new Scene(root, 300, 450);
+ stage.show();
+}