dart lang中的自定義註釋/元數據

Question

任何人都可以解釋在Dart中使用註釋嗎？

在文檔，我發現這個例子：

library todo; 

class todo { 
    final String who; 
    final String what; 

    const todo(this.who, this.what); 
} 

其次

import 'todo.dart'; 

@todo('seth', 'make this do something') 
void doSomething() { 
print('do something'); 
} 

所以，我拿什麼主write（）方法來獲得執行DoSomething的（）函數？

感謝

Answer 1

喜歡的東西

import 'dart:mirrors'; 
import 'do_something.dart'; 
import 'todo.dart'; 


void main() { 
    currentMirrorSystem().libraries.forEach((uri, lib) { 
    //print('lib: ${uri}'); 
    lib.declarations.forEach((s, decl) { 
     //print('decl: ${s}'); 
     decl.metadata.where((m) => m.reflectee is Todo).forEach((m) { 
     var anno = m.reflectee as Todo; 
     if(decl is MethodMirror) { 
      print('Todo(${anno.who}, ${anno.what})'); 
      ((decl as MethodMirror).owner as LibraryMirror).invoke(s, []); 
     }; 
     }); 
    }); 
    }); 
}