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 // __proto__ magic property is non-standard. Use Object.getPrototypeOf
  33 // and Object.setPrototypeOf instead. This script finds __proto__
  34 // usage in scripts a given directory (recursively). If no directory 
  35 // is specified the current working directory is scanned for scripts.
  36 
  37 if (arguments.length == 0) {
  38     arguments[0] = ".";
  39 }
  40 
  41 var File = Java.type("java.io.File");
  42 var file = new File(arguments[0]);
  43 if (!file.exists()) {
  44     print(arguments[0] + " is neither a file nor a directory");
  45     exit(1);
  46 }
  47 
  48 var Files = Java.type("java.nio.file.Files");
  49 var Parser = Java.type("jdk.nashorn.api.tree.Parser");
  50 var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");
  51 
  52 var parser = Parser.create("-scripting", "--const-as-var");
  53 var protoFound = false;
  54 
  55 function checkFile(file) {
  56     // print("checking " + file);
  57     var ast = parser.parse(file, print);
  58     if (!ast) {
  59         return;
  60     }
  61 
  62     // locate __proto__ usage and warn
  63     ast.accept(visitor = new (Java.extend(SimpleTreeVisitor)) {
  64         lineMap: null,
  65 
  66         printWarning: function(node) {
  67             var pos = node.startPosition;
  68             var line = this.lineMap.getLineNumber(pos);
  69             var column = this.lineMap.getColumnNumber(pos);
  70             print("WARNING: __proto__ usage in " + file + " @ " + line + ":" + column);
  71         },
  72 
  73         checkProto: function(node, name) {
  74             if (name == "__proto__") {
  75                 protoFound = true;
  76                 this.printWarning(node);
  77             }
  78         },
  79 
  80         visitCompilationUnit: function(node, extra) {
  81             this.lineMap = node.lineMap;
  82             Java.super(visitor).visitCompilationUnit(node, extra);
  83         },
  84 
  85         visitIdentifier: function(node, extra) {
  86             this.checkProto(node, node.name);
  87             Java.super(visitor).visitIdentifier(node, extra);
  88         },
  89 
  90         visitMemberSelect: function(node, extra) {
  91             this.checkProto(node, node.identifier);
  92             Java.super(visitor).visitMemberSelect(node, extra);
  93         },
  94 
  95         visitProperty: function(node, extra) {
  96             this.checkProto(node, node.key);
  97             Java.super(visitor).visitProperty(node, extra);
  98         }
  99     }, null);
 100 }
 101 
 102 if (file.isDirectory()) {
 103     Files.walk(file.toPath())
 104         .filter(function(p) Files.isRegularFile(p))
 105         .filter(function(p) p.toFile().name.endsWith('.js'))
 106         .forEach(checkFile);
 107 } else {
 108     checkFile(file);
 109 }
 110 
 111 if (protoFound) {
 112     print("__proto__ is non-standard. Use Object.get/setPrototypeOf instead");
 113 }