1 #// Usage: jjs -scripting -fx nashornastviewer.js -- <scriptfile>

     2 

     3 /*

     4  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions

     8  * are met:

     9  *

    10  *   - Redistributions of source code must retain the above copyright

    11  *     notice, this list of conditions and the following disclaimer.

    12  *

    13  *   - Redistributions in binary form must reproduce the above copyright

    14  *     notice, this list of conditions and the following disclaimer in the

    15  *     documentation and/or other materials provided with the distribution.

    16  *

    17  *   - Neither the name of Oracle nor the names of its

    18  *     contributors may be used to endorse or promote products derived

    19  *     from this software without specific prior written permission.

    20  *

    21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

    22  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

    23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

    25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

    31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    32  */

    33 

    34 # NOTE: This script requires JDK 9 build to run

    35 

    36 if (!$OPTIONS._fx) {

    37     print("Usage: jjs -scripting -fx nashornastviewer.js -- <.js file>");

    38     exit(1);

    39 }

    40 

    41 // Using JavaFX from Nashorn. See also:

    42 // http://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/javafx.html

    43 

    44 // This example shows AST of a script file as a JavaFX

    45 // tree view in a window. If no file is specified, AST of

    46 // this script file is shown. This script demonstrates

    47 // Nashorn Parser API too - http://openjdk.java.net/jeps/236

    48 

    49 // JavaFX classes used

    50 var StackPane = Java.type("javafx.scene.layout.StackPane");

    51 var Scene     = Java.type("javafx.scene.Scene");

    52 var TreeItem  = Java.type("javafx.scene.control.TreeItem");

    53 var TreeView  = Java.type("javafx.scene.control.TreeView");

    54 

    55 // Java classes used

    56 var Enum = Java.type("java.lang.Enum");

    57 var File = Java.type("java.io.File");

    58 var List = Java.type("java.util.List");

    59 var Parser = Java.type("jdk.nashorn.api.tree.Parser");

    60 var Tree = Java.type("jdk.nashorn.api.tree.Tree");

    61 

    62 // Create a javafx TreeItem to view a AST node

    63 function treeItemForASTNode(ast, name) {

    64     var item = new TreeItem(name);

    65     // make an iteratable script object from a Tree

    66     ast = Object.bindProperties({}, ast);

    67     for (var prop in ast) {

    68        var node = ast[prop];

    69        var type = typeof node;

    70  

    71        if (node == null || type == "function") {

    72            // skip nulls and Java methods

    73            continue;

    74        }

    75 

    76        var subitem = null;

    77        if (node instanceof Tree) {

    78            subitem = treeItemForASTNode(node, prop);

    79        } else if (node instanceof List) {

    80            var len = node.size();

    81            subitem = new TreeItem(prop);

    82            for (var i = 0; i < len; i++) {

    83                var li = treeItemForASTNode(node.get(i), String(i));

    84                subitem.children.add(li); 

    85            }

    86        } else if (node instanceof Enum || type != 'object') {

    87            subitem = new TreeItem(prop + ": " + node);

    88        }

    89 

    90        if (subitem) {

    91            item.children.add(subitem);

    92        }

    93     }

    94     return item;

    95 }

    96 

    97 // do we have a script file passed? if not, use current script

    98 var sourceName = arguments.length == 0? __FILE__ : arguments[0];

    99 

   100 var parser = Parser.create("-scripting");

   101 // parse script to get CompilationUnitTree of it

   102 var ast = parser.parse(new File(sourceName), null);

   103 

   104 // JavaFX start method

   105 function start(stage) {

   106     stage.title = "AST Viewer";

   107     var rootItem = treeItemForASTNode(ast, sourceName);

   108     var tree = new TreeView(rootItem);

   109     var root = new StackPane();

   110     root.children.add(tree);

   111     stage.scene = new Scene(root, 300, 450);

   112     stage.show();

   113 }