检查方法范围Java中的重复变量 [英] Check duplicate variable in a method scope Java

问题描述

我使用包含某些方法的FileReader读取了Java文件.我如何读取方法范围(方法区域内)以查找重复的变量?

例如，这是我读取的一个Java文件:

public double[] copyArray(double[] data) {
    int _nn = data.length;
    double[] _tmp = new double[_nn];

    System.arraycopy(data, 0, _tmp, 0, _nn);
    int _nn;
    _nn = tmp;

    return _tmp;
}

如何知道方法作用域?，我的意思是在{和}之间，如果找到了作用域，则找到重复的变量，例如上面的示例(int _nn)被重复.

[添加] 我曾尝试使用Java解析器，然后成功.然后，我应该使用列表发送结果，但只能发送列表中的最后一个方法.我的代码有什么问题?

这是MethodVisitor:

private static class MethodVisitor extends VoidVisitorAdapter {
    private List<String> list = new ArrayList<String>();

    @Override
    public void visit(MethodDeclaration n, Object file) {
        list.add(n.getName());

    }
    public List<String> getList() {
        return list;
    }
}

然后，这是一个调用MethodVisitor的方法:

private MethodVisitor mv;

public void doIt(File file) throws Exception {
    CompilationUnit cu;
    try {
        // parse the file
        cu = JavaParser.parse(file);
    } finally {
        //file.close();
    }
    // visit and print the methods names
    mv = new MethodVisitor();
    mv.visit(cu, file);

    List<String> list = mv.getList();

    for(String item:list){
        System.out.println(item);
    }
} 

解决方案

1，您需要解析Java代码:

http://code.google.com/p/javaparser/

或阅读:

Java源代码解析器/生成器

2之后，尝试尝试并显示您的代码

I read java file using FileReader that contains some method. How i can read method scope (method area inside) to find duplicate variable?

For example, this is a java file that i read:

public double[] copyArray(double[] data) {
    int _nn = data.length;
    double[] _tmp = new double[_nn];

    System.arraycopy(data, 0, _tmp, 0, _nn);
    int _nn;
    _nn = tmp;

    return _tmp;
}

How to know method scope?, i mean between { and }, if scope has found, find duplicate variable such as example above (int _nn) duplicated.

[addition] i have tried using java parser, then is success. Then i should send the results using list, but only last method in the list. What's wrong with my code?

This is a MethodVisitor:

private static class MethodVisitor extends VoidVisitorAdapter {
    private List<String> list = new ArrayList<String>();

    @Override
    public void visit(MethodDeclaration n, Object file) {
        list.add(n.getName());

    }
    public List<String> getList() {
        return list;
    }
}

Then, this is a method to call MethodVisitor:

private MethodVisitor mv;

public void doIt(File file) throws Exception {
    CompilationUnit cu;
    try {
        // parse the file
        cu = JavaParser.parse(file);
    } finally {
        //file.close();
    }
    // visit and print the methods names
    mv = new MethodVisitor();
    mv.visit(cu, file);

    List<String> list = mv.getList();

    for(String item:list){
        System.out.println(item);
    }
} 

解决方案

1 you need to parse java code:

http://code.google.com/p/javaparser/

or read this:

Java source code parsers/generators

2 after that, try something and show your code

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