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

/*

 * 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.

 */

if (!$OPTIONS._fx) {

    print("Usage: jjs -scripting -fx astviewer.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

// 'load' function, JavaFX support by -fx, readFully function

// in scripting mode.

// 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 AST node

function treeItemForASTNode(ast, name) {

    var item = new TreeItem(name);

    for (var prop in ast) {

       var node = ast[prop];

       if (typeof node == 'object') {

           if (node == null) {

               // skip nulls

               continue;

           }

           if (Array.isArray(node) && node.length == 0) {

               // skip empty arrays

               continue;

           }

           var subitem = treeItemForASTNode(node, prop);

       } else {

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

       }

       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];

// load parser.js from nashorn resources

load("nashorn:parser.js");

// read the full content of the file and parse it 

// to get AST of the script specified

var ast = parse(readFully(sourceName));

// 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();

}