aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
aoqi@0:  * Redistribution and use in source and binary forms, with or without
aoqi@0:  * modification, are permitted provided that the following conditions
aoqi@0:  * are met:
attila@962:  *
aoqi@0:  *   - Redistributions of source code must retain the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
aoqi@0:  *   - Redistributions in binary form must reproduce the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer in the
aoqi@0:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
aoqi@0:  *   - Neither the name of Oracle nor the names of its
aoqi@0:  *     contributors may be used to endorse or promote products derived
aoqi@0:  *     from this software without specific prior written permission.
attila@962:  *
aoqi@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0:  */
aoqi@0: 
aoqi@0: // Usage: jjs javacastcounter.js -- <.java files>
aoqi@0: 
aoqi@0: // This example demonstrates Nashorn Java.extend API
aoqi@0: // to subclass a Java class from script.
aoqi@0: 
aoqi@0: // This example uses Javac Compiler and Tree API
aoqi@0: // to list type casts used in java source files.
aoqi@0: 
aoqi@0: if (arguments.length == 0) {
aoqi@0:     print("Usage: jjs javacastcounter.js -- <.java files>");
aoqi@0:     exit(1);
aoqi@0: }
aoqi@0: 
aoqi@0: // Java types used
aoqi@0: var ToolProvider = Java.type("javax.tools.ToolProvider");
aoqi@0: var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
aoqi@0: var Trees = Java.type("com.sun.source.util.Trees");
aoqi@0: var StringArray = Java.type("java.lang.String[]");
aoqi@0: 
aoqi@0: // get the system compiler tool
aoqi@0: var compiler = ToolProvider.systemJavaCompiler;
aoqi@0: 
aoqi@0: // get standard file manager
aoqi@0: var fileMgr = compiler.getStandardFileManager(null, null, null);
aoqi@0: 
aoqi@0: // make a list of compilation unit from command line argument file names
aoqi@0: // Using Java.to convert script array (arguments) to a Java String[]
aoqi@0: var compUnits = fileMgr.getJavaFileObjects(Java.to(arguments, StringArray));
aoqi@0: 
aoqi@0: // create a new compilation task
aoqi@0: var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
aoqi@0: 
aoqi@0: // SourcePositions object to get positions of AST nodes
aoqi@0: var sourcePositions = Trees.instance(task).sourcePositions;
aoqi@0: 
aoqi@0: // Subclass TreeScanner class
aoqi@0: var CastCounter = Java.extend(TreeScanner);
aoqi@0: 
aoqi@0: var counter = new CastCounter() {
aoqi@0:     // current CompilationUnitTree
aoqi@0:     compUnit: null,
aoqi@0:     // current LineMap (pos -> line, column)
aoqi@0:     lineMap: null,
aoqi@0:     // current compilation unit's file name
aoqi@0:     fileName: null,
aoqi@0: 
aoqi@0:     // overrides of TreeScanner methods
aoqi@0: 
aoqi@0:     visitCompilationUnit: function(node, p) {
aoqi@0:         // capture info about current Compilation unit
aoqi@0:         this.compUnit = node;
aoqi@0:         this.lineMap = node.lineMap;
aoqi@0:         this.fileName = node.sourceFile.name;
aoqi@0: 
attila@962:         // Using Java.super API to call super class method here
aoqi@0:         return Java.super(counter).visitCompilationUnit(node, p);
aoqi@0:     },
aoqi@0: 
aoqi@0:     visitTypeCast: function(node, p) {
aoqi@0:         // print information on this type cast node
aoqi@0:         var pos = sourcePositions.getStartPosition(this.compUnit, node);
aoqi@0:         var line = this.lineMap.getLineNumber(pos);
aoqi@0:         var col = this.lineMap.getColumnNumber(pos);
aoqi@0:         print(node + " @ " + this.fileName + ":" + line + ":" + col);
aoqi@0: 
aoqi@0:         // count one more type cast
aoqi@0:         return 1;
aoqi@0:     },
aoqi@0: 
aoqi@0:     reduce: function(r1, r2) {
aoqi@0:         return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2);
aoqi@0:     }
aoqi@0: };
aoqi@0: 
aoqi@0: // print total number of type cast nodes seen
aoqi@0: print("Total casts:", counter.scan(task.parse(), null));