Wed, 07 Oct 2015 10:01:40 -0700
Merge
1 /*
2 * Copyright (c) 2014, 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 */
32 // Usage: jjs javacastcounter.js -- <.java files>
34 // This example demonstrates Nashorn Java.extend API
35 // to subclass a Java class from script.
37 // This example uses Javac Compiler and Tree API
38 // to list type casts used in java source files.
40 if (arguments.length == 0) {
41 print("Usage: jjs javacastcounter.js -- <.java files>");
42 exit(1);
43 }
45 // Java types used
46 var ToolProvider = Java.type("javax.tools.ToolProvider");
47 var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
48 var Trees = Java.type("com.sun.source.util.Trees");
49 var StringArray = Java.type("java.lang.String[]");
51 // get the system compiler tool
52 var compiler = ToolProvider.systemJavaCompiler;
54 // get standard file manager
55 var fileMgr = compiler.getStandardFileManager(null, null, null);
57 // make a list of compilation unit from command line argument file names
58 // Using Java.to convert script array (arguments) to a Java String[]
59 var compUnits = fileMgr.getJavaFileObjects(Java.to(arguments, StringArray));
61 // create a new compilation task
62 var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
64 // SourcePositions object to get positions of AST nodes
65 var sourcePositions = Trees.instance(task).sourcePositions;
67 // Subclass TreeScanner class
68 var CastCounter = Java.extend(TreeScanner);
70 var counter = new CastCounter() {
71 // current CompilationUnitTree
72 compUnit: null,
73 // current LineMap (pos -> line, column)
74 lineMap: null,
75 // current compilation unit's file name
76 fileName: null,
78 // overrides of TreeScanner methods
80 visitCompilationUnit: function(node, p) {
81 // capture info about current Compilation unit
82 this.compUnit = node;
83 this.lineMap = node.lineMap;
84 this.fileName = node.sourceFile.name;
86 // Using Java.super API to call super class method here
87 return Java.super(counter).visitCompilationUnit(node, p);
88 },
90 visitTypeCast: function(node, p) {
91 // print information on this type cast node
92 var pos = sourcePositions.getStartPosition(this.compUnit, node);
93 var line = this.lineMap.getLineNumber(pos);
94 var col = this.lineMap.getColumnNumber(pos);
95 print(node + " @ " + this.fileName + ":" + line + ":" + col);
97 // count one more type cast
98 return 1;
99 },
101 reduce: function(r1, r2) {
102 return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2);
103 }
104 };
106 // print total number of type cast nodes seen
107 print("Total casts:", counter.scan(task.parse(), null));