nashorn/samples/resourcetrysuggester.js
author cjplummer
Sat, 06 May 2017 00:05:32 +0000
changeset 46439 6de560f6c1ad
parent 32692 8f60bd284bf4
permissions -rw-r--r--
Merge
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#// Usage: jjs resourcetrysuggester.js -- <directory>
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/*
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 * Copyright (c) 2015, 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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// This example demonstrates Java subclassing by Java.extend
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// and javac Compiler and Tree API. This example looks for
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// finally clauses with "close" call and suggests "resource try"!
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if (arguments.length == 0) {
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    print("Usage: jjs resourcetrysuggester.js -- <directory>");
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    exit(1);
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}
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// Java types used
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var ExpressionStatementTree = Java.type("com.sun.source.tree.ExpressionStatementTree");
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var File = Java.type("java.io.File");
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var Files = Java.type("java.nio.file.Files");
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var MemberSelectTree = Java.type("com.sun.source.tree.MemberSelectTree");
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var MethodInvocationTree = Java.type("com.sun.source.tree.MethodInvocationTree");
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var StringArray = Java.type("java.lang.String[]");
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var ToolProvider = Java.type("javax.tools.ToolProvider");
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var Tree = Java.type("com.sun.source.tree.Tree");
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var Trees = Java.type("com.sun.source.util.Trees");
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var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
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// resourceTrySuggestions
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function resourceTrySuggestions() {
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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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    // Using Java.to convert script array (arguments) to a Java String[]
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    var compUnits = fileMgr.getJavaFileObjects(
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        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 SimpleTreeVisitor - to print resource try suggestions
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    var ResourceTrySuggester = Java.extend(TreeScanner);
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    function hasOnlyEmptyStats(stats) {
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        var itr = stats.iterator();
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        while (itr.hasNext()) {
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            if (! (itr.next() instanceof EmptyStatementTree)) {
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                return false;
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            }
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        }
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        return true;
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    }
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    // does the given statement list has an expression statement which
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    // calls "close" method (don't worry about types - just crude one will do)
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    function hasCloseCall(stats) {
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        var itr = stats.iterator();
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        while (itr.hasNext()) {
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            var stat = itr.next();
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            if (stat instanceof ExpressionStatementTree) {
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                var expr = stat.expression;
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                if (expr instanceof MethodInvocationTree) {
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                    var method = expr.methodSelect;
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                    if (method instanceof MemberSelectTree) {
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                        return method.identifier.toString().equals("close");
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                    }
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                }
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            }
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        }
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        return false;
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    }
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    var visitor = new ResourceTrySuggester() {
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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(visitor).visitCompilationUnit(node, p);
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        },
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        visitTry: function (node, p) {
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            var finallyBlk = node.finallyBlock;
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            if (finallyBlk != null && hasCloseCall(finallyBlk.statements)) {
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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("Consider resource try statement " + " @ " + this.fileName + ":" + line + ":" + col);
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                // print(node);
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            }
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        }
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    }
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    for each (var cu in task.parse()) {
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        cu.accept(visitor, null);
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    }
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}
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// for each ".java" file in directory (recursively) and check it!
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function main(dir) {
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    Files.walk(dir.toPath()).
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      forEach(function(p) {
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        var name = p.toFile().absolutePath;
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        if (name.endsWith(".java")) {
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            try {
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                resourceTrySuggestions(p.toFile().getAbsolutePath());
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            } catch (e) {
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                print(e);
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            }
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        }
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      });
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}
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main(new File(arguments[0]));