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-/*
- * 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
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * 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));