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

/*

 * Copyright (c) 2015, 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.

 */

# NOTE: This script requires JDK 9 build to run

if (!$OPTIONS._fx) {

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

    exit(1);

}

// Using JavaFX from Nashorn. See also:

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

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

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

// this script file is shown. This script demonstrates

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

// 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");

// Java classes used

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

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

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

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

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

// Create a javafx TreeItem to view a AST node

function treeItemForASTNode(ast, name) {

    var item = new TreeItem(name);

    // make an iteratable script object from a Tree

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

    for (var prop in ast) {

       var node = ast[prop];

       var type = typeof node;

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

           // skip nulls and Java methods

           continue;

       }

       var subitem = null;

       if (node instanceof Tree) {

           subitem = treeItemForASTNode(node, prop);

       } else if (node instanceof List) {

           var len = node.size();

           subitem = new TreeItem(prop);

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

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

               subitem.children.add(li); 

           }

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

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

       }

       if (subitem) {

           item.children.add(subitem);

       }

    }

    return item;

}

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

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

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

// parse script to get CompilationUnitTree of it

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

// JavaFX start method

function start(stage) {

    stage.title = "AST Viewer";

    var rootItem = treeItemForASTNode(ast, sourceName);

    var tree = new TreeView(rootItem);

    var root = new StackPane();

    root.children.add(tree);

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

    stage.show();

}