Mercurial > jdk8-mips64-public > nashorn / file revision

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  *     from this software without specific prior written permission.

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  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

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 // 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));