1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/javacastcounter.js Wed Apr 27 01:36:41 2016 +0800
1.3 @@ -0,0 +1,107 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions
1.9 + * are met:
1.10 + *
1.11 + * - Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + *
1.14 + * - Redistributions in binary form must reproduce the above copyright
1.15 + * notice, this list of conditions and the following disclaimer in the
1.16 + * documentation and/or other materials provided with the distribution.
1.17 + *
1.18 + * - Neither the name of Oracle nor the names of its
1.19 + * contributors may be used to endorse or promote products derived
1.20 + * from this software without specific prior written permission.
1.21 + *
1.22 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.23 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1.24 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.25 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.26 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.27 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.28 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.29 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.30 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.31 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.32 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.33 + */
1.34 +
1.35 +// Usage: jjs javacastcounter.js -- <.java files>
1.36 +
1.37 +// This example demonstrates Nashorn Java.extend API
1.38 +// to subclass a Java class from script.
1.39 +
1.40 +// This example uses Javac Compiler and Tree API
1.41 +// to list type casts used in java source files.
1.42 +
1.43 +if (arguments.length == 0) {
1.44 + print("Usage: jjs javacastcounter.js -- <.java files>");
1.45 + exit(1);
1.46 +}
1.47 +
1.48 +// Java types used
1.49 +var ToolProvider = Java.type("javax.tools.ToolProvider");
1.50 +var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
1.51 +var Trees = Java.type("com.sun.source.util.Trees");
1.52 +var StringArray = Java.type("java.lang.String[]");
1.53 +
1.54 +// get the system compiler tool
1.55 +var compiler = ToolProvider.systemJavaCompiler;
1.56 +
1.57 +// get standard file manager
1.58 +var fileMgr = compiler.getStandardFileManager(null, null, null);
1.59 +
1.60 +// make a list of compilation unit from command line argument file names
1.61 +// Using Java.to convert script array (arguments) to a Java String[]
1.62 +var compUnits = fileMgr.getJavaFileObjects(Java.to(arguments, StringArray));
1.63 +
1.64 +// create a new compilation task
1.65 +var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
1.66 +
1.67 +// SourcePositions object to get positions of AST nodes
1.68 +var sourcePositions = Trees.instance(task).sourcePositions;
1.69 +
1.70 +// Subclass TreeScanner class
1.71 +var CastCounter = Java.extend(TreeScanner);
1.72 +
1.73 +var counter = new CastCounter() {
1.74 + // current CompilationUnitTree
1.75 + compUnit: null,
1.76 + // current LineMap (pos -> line, column)
1.77 + lineMap: null,
1.78 + // current compilation unit's file name
1.79 + fileName: null,
1.80 +
1.81 + // overrides of TreeScanner methods
1.82 +
1.83 + visitCompilationUnit: function(node, p) {
1.84 + // capture info about current Compilation unit
1.85 + this.compUnit = node;
1.86 + this.lineMap = node.lineMap;
1.87 + this.fileName = node.sourceFile.name;
1.88 +
1.89 + // Using Java.super API to call super class method here
1.90 + return Java.super(counter).visitCompilationUnit(node, p);
1.91 + },
1.92 +
1.93 + visitTypeCast: function(node, p) {
1.94 + // print information on this type cast node
1.95 + var pos = sourcePositions.getStartPosition(this.compUnit, node);
1.96 + var line = this.lineMap.getLineNumber(pos);
1.97 + var col = this.lineMap.getColumnNumber(pos);
1.98 + print(node + " @ " + this.fileName + ":" + line + ":" + col);
1.99 +
1.100 + // count one more type cast
1.101 + return 1;
1.102 + },
1.103 +
1.104 + reduce: function(r1, r2) {
1.105 + return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2);
1.106 + }
1.107 +};
1.108 +
1.109 +// print total number of type cast nodes seen
1.110 +print("Total casts:", counter.scan(task.parse(), null));
