#// Usage: jjs javafoovars.js -- <directory>

/*

 * 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 counts number

// of variables called "foo" in the given java source files!

if (arguments.length == 0) {

    print("Usage: jjs javafoovars.js -- <directory>");

    exit(1);

}

// Java types used

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

var Files = Java.type("java.nio.file.Files");

var FileVisitOption = Java.type("java.nio.file.FileVisitOption");

var StringArray = Java.type("java.lang.String[]");

var ToolProvider = Java.type("javax.tools.ToolProvider");

var Tree = Java.type("com.sun.source.tree.Tree");

var TreeScanner = Java.type("com.sun.source.util.TreeScanner");

var VariableTree = Java.type("com.sun.source.tree.VariableTree");

// count "foo"-s in the given .java files

function countFoo() {

    // get the system compiler tool

    var compiler = ToolProvider.systemJavaCompiler;

    // get standard file manager

    var fileMgr = compiler.getStandardFileManager(null, null, null);

    // Using Java.to convert script array (arguments) to a Java String[]

    var compUnits = fileMgr.getJavaFileObjects(

        Java.to(arguments, StringArray));

    // create a new compilation task

    var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);

    // subclass SimpleTreeVisitor - to count variables called "foo"

    var FooCounterVisitor = Java.extend(TreeScanner);

    var fooCount = 0;

    var visitor = new FooCounterVisitor() {

        visitVariable: function (node, p) {

            if (node.name.toString() == "foo") {

                fooCount++;

            }

        }

    }

    for each (var cu in task.parse()) {

        cu.accept(visitor, null);

    }

    return fooCount;

}

// for each ".java" file in directory (recursively) count "foo".

function main(dir) {

    var totalCount = 0;

    Files.walk(dir.toPath(), FileVisitOption.FOLLOW_LINKS).

      forEach(function(p) {

        var name = p.toFile().absolutePath;

        if (name.endsWith(".java")) {

            var count = 0;

            try {

                count = countFoo(p.toFile().getAbsolutePath());

            } catch (e) {

                print(e);

            }

            if (count != 0) {

                print(name + ": " + count);

            }

            totalCount += count;

        }

      });

    print("Total foo count: " + totalCount);

}

main(new File(arguments[0]));