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 // Usage: jjs find_underscores.js -- <directory>

    33 

    34 if (arguments.length == 0) {

    35     print("Usage: jjs find_underscores.js -- <directory>");

    36     exit(1);

    37 }

    38 

    39 // Java types used

    40 var File = Java.type("java.io.File");

    41 var Files = Java.type("java.nio.file.Files");

    42 var StringArray = Java.type("java.lang.String[]");

    43 var ToolProvider = Java.type("javax.tools.ToolProvider");

    44 var Tree = Java.type("com.sun.source.tree.Tree");

    45 var Trees = Java.type("com.sun.source.util.Trees");

    46 var TreeScanner = Java.type("com.sun.source.util.TreeScanner");

    47 

    48 function findUnderscores() {

    49     // get the system compiler tool

    50     var compiler = ToolProvider.systemJavaCompiler;

    51     // get standard file manager

    52     var fileMgr = compiler.getStandardFileManager(null, null, null);

    53     // Using Java.to convert script array (arguments) to a Java String[]

    54     var compUnits = fileMgr.getJavaFileObjects(Java.to(arguments, StringArray));

    55     // create a new compilation task

    56     var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);

    57     var sourcePositions = Trees.instance(task).sourcePositions;

    58     // subclass SimpleTreeVisitor - to find underscore variable names

    59     var UnderscoreFinder = Java.extend(TreeScanner);

    60 

    61     var visitor = new UnderscoreFinder() {

    62         // override to capture information on current compilation unit

    63         visitCompilationUnit: function(compUnit, p) {

    64             this.compUnit = compUnit;

    65             this.lineMap = compUnit.lineMap;

    66             this.fileName = compUnit.sourceFile.name;

    67 

    68             return Java.super(visitor).visitCompilationUnit(compUnit, p);

    69         },

    70 

    71         // override to check variable name

    72         visitVariable: function(node, p) {

    73             if (node.name.toString() == "_") {

    74                 var pos = sourcePositions.getStartPosition(this.compUnit, node);

    75                 var line = this.lineMap.getLineNumber(pos);

    76                 var col = this.lineMap.getColumnNumber(pos);

    77                 print(node + " @ " + this.fileName + ":" + line + ":" + col);

    78             }

    79 

    80             return Java.super(visitor).visitVariable(node, p);

    81         }

    82     }

    83 

    84     for each (var cu in task.parse()) {

    85         cu.accept(visitor, null);

    86     }

    87 }

    88 

    89 // for each ".java" file in directory (recursively).

    90 function main(dir) {

    91     var totalCount = 0;

    92     Files.walk(dir.toPath()).

    93       forEach(function(p) {

    94           var name = p.toFile().absolutePath;

    95           if (name.endsWith(".java")) {

    96               findUnderscores(p);

    97           }

    98       });

    99 }

   100 

   101 main(new File(arguments[0]));