https://blogs.oracle.com/sundararajan/entry/java_source_name_pattern_checker
Ken Fogel(@omniprof)が先日以下のようなTweetをしていました。
a,b,c,d,e,f,g,h,I,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y & z are not identifiers. IDE should show an error when an identifier is less than 3 char.— Ken Fogel (@omniprof) 2016年6月19日
IDEによるソリューションはないのですが、以下のNashornスクリプトをカスタマイズして、Javaソースコード中のクラスやメソッド、変数名のパターンをチェックすることができます。このスクリプトはJava Tree APIを使ってJavaソースコードを解析しています。
Compiler Tree APIその後、TreeScannerサブクラスをスクリプト内で利用してcheckXYZメソッドを呼び出し、クラスやメソッド、変数名をチェックします。checkXYZNameがfalseを返すと、このスクリプトは標準出力にソースのファイル名、行番号、列番号を表示します。
https://docs.oracle.com/javase/8/docs/jdk/api/javac/tree/
おそらくこのスクリプトをカスタマイズして学生のソースを評価するのに使うことができるかもしれません。
/* * Copyright (c) 2016, 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 checknames.js -- <file-or-directory> if (arguments.length == 0) { print("Usage: jjs checknames.js -- <file-or-directory>"); exit(1); } // Java types used var File = Java.type("java.io.File"); var Files = Java.type("java.nio.file.Files"); var StringArray = Java.type("java.lang.String[]"); var ToolProvider = Java.type("javax.tools.ToolProvider"); var Tree = Java.type("com.sun.source.tree.Tree"); var Trees = Java.type("com.sun.source.util.Trees"); var TreeScanner = Java.type("com.sun.source.util.TreeScanner"); // customize these functions with checks that you'd want! function checkClassName(name) { return name.length < 3; } function checkMethodName(name) { return name.length < 3; } function checkVarName(name) { return name.length < 3; } function checkNames() { // get the system compiler tool var compiler = ToolProvider.systemJavaCompiler; // get standard file manager var fileMgr = compiler.getStandardFileManager(null, null, null); // 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); var sourcePositions = Trees.instance(task).sourcePositions; // subclass SimpleTreeVisitor var NameChecker = Java.extend(TreeScanner); var visitor = new NameChecker() { report: function(node) { var pos = sourcePositions.getStartPosition(this.compUnit, node); var line = this.lineMap.getLineNumber(pos); var col = this.lineMap.getColumnNumber(pos); print("Too short name: " + node.name + " @ " + this.fileName + ":" + line + ":" + col); }, // override to capture information on current compilation unit visitCompilationUnit: function(compUnit, p) { this.compUnit = compUnit; this.lineMap = compUnit.lineMap; this.fileName = compUnit.sourceFile.name; return Java.super(visitor).visitCompilationUnit(compUnit, p); }, // override to check class name visitClass: function(node, p) { if (checkClassName(node.simpleName.toString())) { this.report(node); } return Java.super(visitor).visitClass(node, p); }, // override to check method name visitMethod: function(node, p) { if (checkMethodName(node.name.toString())) { this.report(node); } return Java.super(visitor).visitMethod(node, p); }, // override to check variable name visitVariable: function(node, p) { if (checkVarName(node.name.toString())) { this.report(node); } return Java.super(visitor).visitVariable(node, p); } } for each (var cu in task.parse()) { cu.accept(visitor, null); } } // for each ".java" file in directory (recursively). function main(dir) { var totalCount = 0; Files.walk(dir.toPath()). forEach(function(p) { var name = p.toFile().absolutePath; if (name.endsWith(".java")) { checkNames(p); } }); } main(new File(arguments[0]));
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