8000 关于 Transformer 的用法问题 · Issue #78 · XianyuTech/aspectd · GitHub
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IamKing opened this issue Dec 11, 2020 · 2 comments
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关于 Transformer 的用法问题 #78

IamKing opened this issue Dec 11, 2020 · 2 comments

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@IamKing
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IamKing commented Dec 11, 2020 •
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@kangwang1988 @fightcoder 大佬，咨询关于 Transformer的问题。
我想要修改 dill 文件中，某个类的某个方法的方法名：例如修改 _MyHomePageState中的_incrementCounter方法为_incrementCounter123，这么做的目的是加深我对 ast 和 visitor 的理解，下面是我的代码。我的大概思路是找到对应的 dart 文件的 Library，然后 visit 这个 Library，找到对应的 Class，在 visitClass 中根据名字找到这个Class Node，然后遍历其子元素transformChildren，最后在 visitProcedure中获取方法名，对其更改。

当我按照这个方式来做以后，在通过writeComponentToBinary(component, path + "2");的时候会有各种报错，在visitProcedure中尝试了很多写法都不行，比如创建一个新的 Procedure返回。
求助大佬，我这边的做法存在什么问题？应该怎么做？ 感激提供的任何帮助。

测试代码：

class MethodVisitor extends Transformer {
  @override
  TreeNode visitClass(Class node) {
    print('visitClass=====${node.name}');
    if (node.name == '_MyHomePageState') {
      print("===121221=====${node.procedures}");
      node.transformChildren(this);
    }
    return super.visitClass(node);
  }

  @override
  TreeNode visitProcedure(Procedure node) {
    print('visitProcedure=====${node.name}');
    if (node.reference.canonicalName.name == '_incrementCounter') {
      node.name =Name("_incrementCounter123", node.parent.parent );
    }
    return super.visitProcedure(node);
  }

  @override
  TreeNode visitMethodInvocation(MethodInvocation node) {
    print('methodInvocation===${node.name}===');
    return super.visitMethodInvocation(node);
  }

}

void main() {
  //读取一个 dill 文件，将数据存放在 Component 中
  String path = "/Users/Documents/work/idea_workspace/dart_test/bin/app.dill";
  Component component = new Component();
  List bytes = File(path).readAsBytesSync();
  BinaryBuilderWithMetadata(bytes).readComponent(component);
  int a = 10;

  MethodVisitor methodVisitor = new MethodVisitor();
  //每一个 dart 文件都是一个 Library，每一个 Library 都包含 fields(fieldsInternal)、members、constructors(constructorsInternal)、procedures(proceduresInternal==method) 等
  component.libraries.forEach((element) {
    if (element.reference.canonicalName.name.endsWith('main.dart')) {
      methodVisitor.visitLibrary(element);
    }
  });

  writeComponentToBinary(component, path + "2");
}
@kangwang1988
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现在不要去直接操作dill了
参考最新的实现

@IamKing
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IamKing commented Dec 12, 2020

现在不要去直接操作dill了
参考最新的实现

一步一步来呀，知识就是在基础知识上一点点建立起来的，这样才能更好的理解。大佬，先帮我看看上面的问题哈~

@ameryzhu ameryzhu mentioned this issue Dec 24, 2020
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@kelciej kelciej mentioned this issue Feb 5, 2021
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