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 if (! new File(arguments[0]).isDirectory()) {
  43     print(arguments[0] + " is not a directory");
  44     exit(1);
  45 }
  46 
  47 var Files = Java.type("java.nio.file.Files");
  48 var IdentifierTree = Java.type("jdk.nashorn.api.tree.IdentifierTree");
  49 var Parser = Java.type("jdk.nashorn.api.tree.Parser");
  50 var SimpleTreeVisitor = Java.type("jdk.nashorn.api.tree.SimpleTreeVisitorES5_1");
  51 var Tree = Java.type("jdk.nashorn.api.tree.Tree");
  52 
  53 var parser = Parser.create("-scripting", "--const-as-var");
  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, varName) {
  67             var pos = node.startPosition;
  68             var line = this.lineMap.getLineNumber(pos);
  69             var column = this.lineMap.getColumnNumber(pos);
  70             print("WARNING: delete " + varName + " in " + file + " @ " + line + ":" + column);
  71         },
  72 
  73         visitCompilationUnit: function(node, extra) {
  74             this.lineMap = node.lineMap;
  75             Java.super(visitor).visitCompilationUnit(node, extra);
  76         },
  77 
  78         visitUnary: function(node, extra) {
  79             if (node.kind == Tree.Kind.DELETE &&
  80                 node.expression instanceof IdentifierTree) {
  81                 this.printWarning(node, node.expression.name);
  82             } 
  83             Java.super(visitor).visitUnary(node, extra);
  84         },
  85 
  86     }, null);
  87 }
  88 
  89 Files.walk(new File(arguments[0]).toPath())
  90     .filter(function(p) Files.isRegularFile(p))
  91     .filter(function(p) p.toFile().name.endsWith('.js'))
  92     .forEach(checkFile);