/*

 * 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.

 */

// delete of scope vars is reported as error in strict mode.

// This script finds scripts that such deletes. Scripts in

// the specified directory are scanned. If no directory is 

// specified, the current directory is scanned.

if (arguments.length == 0) {

    arguments[0] = ".";

}

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

var file = new File(arguments[0]);

if (!file.exists()) {

    print(arguments[0] + " is neither a directory nor a file");

    exit(1);

}

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

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

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

var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");

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

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

function checkFile(file) {

    // print("checking " + file);

    var ast = parser.parse(file, print);

    if (!ast) {

        return;

    }

    // locate __proto__ usage and warn

    ast.accept(visitor = new (Java.extend(SimpleTreeVisitor)) {

        lineMap: null,

        printWarning: function(node, varName) {

            var pos = node.startPosition;

            var line = this.lineMap.getLineNumber(pos);

            var column = this.lineMap.getColumnNumber(pos);

            print("WARNING: delete " + varName + " in " + file + " @ " + line + ":" + column);

        },

        visitCompilationUnit: function(node, extra) {

            this.lineMap = node.lineMap;

            Java.super(visitor).visitCompilationUnit(node, extra);

        },

        visitUnary: function(node, extra) {

            if (node.kind == Tree.Kind.DELETE &&

                node.expression instanceof IdentifierTree) {

                this.printWarning(node, node.expression.name);

            } 

            Java.super(visitor).visitUnary(node, extra);

        },

    }, null);

}

if (file.isDirectory()) {

    Files.walk(file.toPath())

        .filter(function(p) Files.isRegularFile(p))

        .filter(function(p) p.toFile().name.endsWith('.js'))

        .forEach(checkFile);

} else {

    checkFile(file);

}