author | igerasim |
Fri, 15 May 2015 22:09:49 +0300 | |
changeset 30641 | 701f6f90dc0b |
parent 26067 | b32ccc3a76c9 |
permissions | -rw-r--r-- |
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#// Usage: jjs -fx javaastviewer.js -- <.java files> |
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/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* - Neither the name of Oracle nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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// This example demonstrates Java subclassing by Java.extend |
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// and javac Compiler and Tree API. This example also uses |
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// -fx and javafx TreeView to visualize Java AST as TreeView |
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if (!$OPTIONS._fx || arguments.length == 0) { |
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print("Usage: jjs -fx javaastviewer.js -- <.java files>"); |
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exit(1); |
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} |
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// Java types used |
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var Enum = Java.type("java.lang.Enum"); |
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var HashSet = Java.type("java.util.HashSet"); |
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var Name = Java.type("javax.lang.model.element.Name"); |
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var List = Java.type("java.util.List"); |
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var Set = Java.type("java.util.Set"); |
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var SimpleTreeVisitor = Java.type("com.sun.source.util.SimpleTreeVisitor"); |
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var StringArray = Java.type("java.lang.String[]"); |
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var ToolProvider = Java.type("javax.tools.ToolProvider"); |
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var Tree = Java.type("com.sun.source.tree.Tree"); |
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function javaASTToScriptObject(args) { |
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// properties ignored (javac implementation class properties) in AST view. |
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// may not be exhaustive - any getAbc would become "abc" property or |
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// public field becomes a property of same name. |
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var ignoredProps = new HashSet(); |
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for each (var word in |
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['extending', 'implementing', 'init', 'mods', 'clazz', 'defs', |
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'expr', 'tag', 'preferredPosition', 'qualid', 'recvparam', |
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'restype', 'params', 'startPosition', 'thrown', |
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'tree', 'typarams', 'typetag', 'vartype']) { |
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ignoredProps.add(word); |
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} |
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// get the system compiler tool |
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var compiler = ToolProvider.systemJavaCompiler; |
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// get standard file manager |
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var fileMgr = compiler.getStandardFileManager(null, null, null); |
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// make a list of compilation unit from command line argument file names |
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// Using Java.to convert script array (arguments) to a Java String[] |
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var compUnits = fileMgr.getJavaFileObjects(Java.to(args, StringArray)); |
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// create a new compilation task |
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var task = compiler.getTask(null, fileMgr, null, null, null, compUnits); |
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// subclass SimpleTreeVisitor - converts Java AST node to |
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// a simple script object by walking through it |
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var ConverterVisitor = Java.extend(SimpleTreeVisitor); |
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var visitor = new ConverterVisitor() { |
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// convert java AST node to a friendly script object |
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// which can be viewed. Every node ends up in defaultAction |
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// method of SimpleTreeVisitor method. |
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defaultAction: function (node, p) { |
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var resultObj = {}; |
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// Nashorn does not iterate properties and methods of Java objects |
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// But, we can bind properties of any object (including java objects) |
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// to a script object and iterate it! |
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var obj = {}; |
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Object.bindProperties(obj, node); |
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// we don't want every property, method of java object |
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for (var prop in obj) { |
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var val = obj[prop]; |
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var type = typeof val; |
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// ignore 'method' members |
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if (type == 'function' || type == 'undefined') { |
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continue; |
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} |
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// ignore properties from Javac implementation |
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// classes - hack by name!! |
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if (ignoredProps.contains(prop)) { |
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continue; |
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} |
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// subtree - recurse it |
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if (val instanceof Tree) { |
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resultObj[prop] = visitor.visit(val, p); |
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} else if (val instanceof List) { |
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// List of trees - recurse each and make an array |
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var len = val.size(); |
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if (len != 0) { |
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var arr = []; |
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for (var j = 0; j < len; j++) { |
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var e = val[j]; |
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if (e instanceof Tree) { |
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arr.push(visitor.visit(e, p)); |
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} |
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} |
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resultObj[prop] = arr; |
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} |
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} else if (val instanceof Set) { |
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// Set - used for modifier flags |
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// make array |
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var len = val.size(); |
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if (len != 0) { |
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var arr = []; |
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for each (var e in val) { |
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if (e instanceof Enum || typeof e == 'string') { |
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arr.push(e.toString()); |
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} |
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} |
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resultObj[prop] = arr; |
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} |
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} else if (val instanceof Enum || val instanceof Name) { |
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// make string for any Enum or Name |
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resultObj[prop] = val.toString(); |
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} else if (type != 'object') { |
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// primitives 'as is' |
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resultObj[prop] = val; |
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} |
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} |
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return resultObj; |
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} |
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} |
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// top level object with one property for each compilation unit |
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var scriptObj = {}; |
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for each (var cu in task.parse()) { |
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scriptObj[cu.sourceFile.name] = cu.accept(visitor, null); |
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} |
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return scriptObj; |
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} |
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// JavaFX classes used |
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var StackPane = Java.type("javafx.scene.layout.StackPane"); |
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var Scene = Java.type("javafx.scene.Scene"); |
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var TreeItem = Java.type("javafx.scene.control.TreeItem"); |
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var TreeView = Java.type("javafx.scene.control.TreeView"); |
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// Create a javafx TreeItem to view a script object |
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function treeItemForObject(obj, name) { |
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var item = new TreeItem(name); |
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for (var prop in obj) { |
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var node = obj[prop]; |
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if (typeof node == 'object') { |
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if (node == null) { |
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// skip nulls |
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continue; |
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} |
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var subitem = treeItemForObject(node, prop); |
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} else { |
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var subitem = new TreeItem(prop + ": " + node); |
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} |
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item.children.add(subitem); |
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} |
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item.expanded = true; |
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return item; |
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} |
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var commandArgs = arguments; |
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// JavaFX start method |
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function start(stage) { |
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var obj = javaASTToScriptObject(commandArgs); |
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stage.title = "Java AST Viewer" |
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var rootItem = treeItemForObject(obj, "AST"); |
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rootItem.expanded = true; |
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var tree = new TreeView(rootItem); |
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var root = new StackPane(); |
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root.children.add(tree); |
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stage.scene = new Scene(root, 300, 450); |
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stage.show(); |
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} |