findwith.js revision 1206:829e3b95b319 
1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 *   - Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 *
11 *   - Redistributions in binary form must reproduce the above copyright
12 *     notice, this list of conditions and the following disclaimer in the
13 *     documentation and/or other materials provided with the distribution.
14 *
15 *   - Neither the name of Oracle nor the names of its
16 *     contributors may be used to endorse or promote products derived
17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32// 'with' statement is not considered a good practive. In strict mode,
33// with statements result in early error being thrown.
34
35// This script finds 'with' usage in scripts a given directory (recursively).
36// If no directory is specified the current working directory is scanned
37// for scripts.
38
39if (arguments.length == 0) {
40    arguments[0] = ".";
41}
42
43var File = Java.type("java.io.File");
44var file = new File(arguments[0]);
45if (!file.exists()) {
46    print(arguments[0] + " is neither a directory nor a file");
47    exit(1);
48}
49
50var Files = Java.type("java.nio.file.Files");
51var Parser = Java.type("jdk.nashorn.api.tree.Parser");
52var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");
53
54var parser = Parser.create("-scripting", "--const-as-var");
55var protoFound = false;
56
57function checkFile(file) {
58    // print("checking " + file);
59    var ast = parser.parse(file, print);
60    if (!ast) {
61        return;
62    }
63
64    // locate __proto__ usage and warn
65    ast.accept(visitor = new (Java.extend(SimpleTreeVisitor)) {
66        lineMap: null,
67
68        printWarning: function(node) {
69            var pos = node.startPosition;
70            var line = this.lineMap.getLineNumber(pos);
71            var column = this.lineMap.getColumnNumber(pos);
72            print("WARNING: 'with' usage in " + file + " @ " + line + ":" + column);
73        },
74
75        visitCompilationUnit: function(node, extra) {
76            this.lineMap = node.lineMap;
77            Java.super(visitor).visitCompilationUnit(node, extra);
78        },
79
80        visitWith: function(node, extra) {
81            this.printWarning(node);
82            Java.super(visitor).visitWith(node, extra);
83        }
84    }, null);
85}
86
87if (file.isDirectory()) {
88    Files.walk(file.toPath())
89        .filter(function(p) Files.isRegularFile(p))
90        .filter(function(p) p.toFile().name.endsWith('.js'))
91        .forEach(checkFile);
92} else {
93    checkFile(file);
94}
95
96if (protoFound) {
97    print("__proto__ is non-standard. Use Object.get/setPrototypeOf instead");
98}
99