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