| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * - Neither the name of Oracle nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| // Usage: jjs javacastcounter.js -- <.java files> |
| |
| // This example demonstrates Nashorn Java.extend API |
| // to subclass a Java class from script. |
| |
| // This example uses Javac Compiler and Tree API |
| // to list type casts used in java source files. |
| |
| if (arguments.length == 0) { |
| print("Usage: jjs javacastcounter.js -- <.java files>"); |
| exit(1); |
| } |
| |
| // Java types used |
| var ToolProvider = Java.type("javax.tools.ToolProvider"); |
| var TreeScanner = Java.type("com.sun.source.util.TreeScanner"); |
| var Trees = Java.type("com.sun.source.util.Trees"); |
| var StringArray = Java.type("java.lang.String[]"); |
| |
| // get the system compiler tool |
| var compiler = ToolProvider.systemJavaCompiler; |
| |
| // get standard file manager |
| var fileMgr = compiler.getStandardFileManager(null, null, null); |
| |
| // make a list of compilation unit from command line argument file names |
| // Using Java.to convert script array (arguments) to a Java String[] |
| var compUnits = fileMgr.getJavaFileObjects(Java.to(arguments, StringArray)); |
| |
| // create a new compilation task |
| var task = compiler.getTask(null, fileMgr, null, null, null, compUnits); |
| |
| // SourcePositions object to get positions of AST nodes |
| var sourcePositions = Trees.instance(task).sourcePositions; |
| |
| // Subclass TreeScanner class |
| var CastCounter = Java.extend(TreeScanner); |
| |
| var counter = new CastCounter() { |
| // current CompilationUnitTree |
| compUnit: null, |
| // current LineMap (pos -> line, column) |
| lineMap: null, |
| // current compilation unit's file name |
| fileName: null, |
| |
| // overrides of TreeScanner methods |
| |
| visitCompilationUnit: function(node, p) { |
| // capture info about current Compilation unit |
| this.compUnit = node; |
| this.lineMap = node.lineMap; |
| this.fileName = node.sourceFile.name; |
| |
| // Using Java.super API to call super class method here |
| return Java.super(counter).visitCompilationUnit(node, p); |
| }, |
| |
| visitTypeCast: function(node, p) { |
| // print information on this type cast node |
| var pos = sourcePositions.getStartPosition(this.compUnit, node); |
| var line = this.lineMap.getLineNumber(pos); |
| var col = this.lineMap.getColumnNumber(pos); |
| print(node + " @ " + this.fileName + ":" + line + ":" + col); |
| |
| // count one more type cast |
| return 1; |
| }, |
| |
| reduce: function(r1, r2) { |
| return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2); |
| } |
| }; |
| |
| // print total number of type cast nodes seen |
| print("Total casts:", counter.scan(task.parse(), null)); |