java - 使用 JavaParser 更改方法级别的字符串变量

Question

我想使用 JavaParser 将 Java 源代码中的所有字符串变量值从任何值更改为 ""。

我可以更改全局变量的值，但无法更改方法级变量的值。

环顾四周，我得到了this的帮助和 this答案，现在我可以获得每个方法中每一行代码的值，如下所示:

static void removeStrings(CompilationUnit cu) {
        for (TypeDeclaration typeDec : cu.getTypes()) {
            List<BodyDeclaration> members = typeDec.getMembers();
            if (members != null) {
                for (BodyDeclaration member : members) {
                    if (member.isMethodDeclaration()) {                                                  // If it is a method variable
                        MethodDeclaration method = (MethodDeclaration) member;
                        Optional<BlockStmt> block = method.getBody();
                        NodeList<Statement> statements = block.get().getStatements();

                        for (Statement tmp : statements) {
                            // How do I change the values here?
                        }

                    }
                }
            }
        }
    }

现在，如果 tmp 是一个字符串声明，我该如何更改它的值？

Answer 1

你是说这样吗？

static void removeStrings(CompilationUnit cu) {
    cu.walk(StringLiteralExpr.class, e -> e.setString(""));
}

测试

CompilationUnit code = JavaParser.parse(
        "class Test {\n" +
            "private static final String CONST = \"This is a constant\";\n" +
            "public static void main(String[] args) {\n" +
                "System.out.println(\"Hello: \" + CONST);" +
            "}\n" +
        "}"
);
System.out.println("BEFORE:");
System.out.println(code);

removeStrings(code);

System.out.println("AFTER:");
System.out.println(code);

输出

BEFORE:
class Test {

    private static final String CONST = "This is a constant";

    public static void main(String[] args) {
        System.out.println("Hello: " + CONST);
    }
}

AFTER:
class Test {

    private static final String CONST = "";

    public static void main(String[] args) {
        System.out.println("" + CONST);
    }
}