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 
  39 if (arguments.length == 0) {
  40     arguments[0] = ".";
  41 }
  42 
  43 var File = Java.type("java.io.File");
  44 if (! new File(arguments[0]).isDirectory()) {
  45     print(arguments[0] + " is not a directory");
  46     exit(1);
  47 }
  48 
  49 var Files = Java.type("java.nio.file.Files");
  50 var Parser = Java.type("jdk.nashorn.api.tree.Parser");
  51 var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");
  52 
  53 var parser = Parser.create("-scripting", "--const-as-var");
  54 var protoFound = false;
  55 
  56 function checkFile(file) {
  57     // print("checking " + file);
  58     var ast = parser.parse(file, print);
  59     if (!ast) {
  60         return;
  61     }
  62 
  63     // locate __proto__ usage and warn
  64     ast.accept(visitor = new (Java.extend(SimpleTreeVisitor)) {
  65         lineMap: null,
  66 
  67         printWarning: function(node) {
  68             var pos = node.startPosition;
  69             var line = this.lineMap.getLineNumber(pos);
  70             var column = this.lineMap.getColumnNumber(pos);
  71             print("WARNING: 'with' usage in " + file + " @ " + line + ":" + column);
  72         },
  73 
  74         visitCompilationUnit: function(node, extra) {
  75             this.lineMap = node.lineMap;
  76             Java.super(visitor).visitCompilationUnit(node, extra);
  77         },
  78 
  79         visitWith: function(node, extra) {
  80             this.printWarning(node);
  81             Java.super(visitor).visitWith(node, extra);
  82         }
  83     }, null);
  84 }
  85 
  86 Files.walk(new File(arguments[0]).toPath())
  87     .filter(function(p) Files.isRegularFile(p))
  88     .filter(function(p) p.toFile().name.endsWith('.js'))
  89     .forEach(checkFile);
  90 
  91 if (protoFound) {
  92     print("__proto__ is non-standard. Use Object.get/setPrototypeOf instead");
  93 }