jdk8-mips64-public/nashorn: comparison samples/javaastviewer.js

comparison: samples/javaastviewer.js

samples/javaastviewer.js

changeset 0: b1a7da25b547
child 962: ac62e33a99b0

equal deleted inserted replaced

--1:000000000000
+:b1a7da25b547
+#// 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();
+}