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 // delete of scope vars is reported as error in strict mode.
  33 // This script finds scripts that such deletes. Scripts in
  34 // the specified directory are scanned. If no directory is 
  35 // specified, the current directory is scanned.
  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 directory nor a file");
  45     exit(1);
  46 }
  47 
  48 var Files = Java.type("java.nio.file.Files");
  49 var IdentifierTree = Java.type("jdk.nashorn.api.tree.IdentifierTree");
  50 var Parser = Java.type("jdk.nashorn.api.tree.Parser");
  51 var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");
  52 var Tree = Java.type("jdk.nashorn.api.tree.Tree");
  53 
  54 var parser = Parser.create("-scripting", "--const-as-var");
  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, varName) {
  68             var pos = node.startPosition;
  69             var line = this.lineMap.getLineNumber(pos);
  70             var column = this.lineMap.getColumnNumber(pos);
  71             print("WARNING: delete " + varName + " 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         visitUnary: function(node, extra) {
  80             if (node.kind == Tree.Kind.DELETE &&
  81                 node.expression instanceof IdentifierTree) {
  82                 this.printWarning(node, node.expression.name);
  83             } 
  84             Java.super(visitor).visitUnary(node, extra);
  85         },
  86 
  87     }, null);
  88 }
  89 
  90 if (file.isDirectory()) {
  91     Files.walk(file.toPath())
  92         .filter(function(p) Files.isRegularFile(p))
  93         .filter(function(p) p.toFile().name.endsWith('.js'))
  94         .forEach(checkFile);
  95 } else {
  96     checkFile(file);
  97 }