Dartlang教程介绍package:metahttps://www.dartlang.org/docs/dart-up-and-running/contents/ch02.html#ch02-metadata
DartEditor 识别元数据,如上面教程所示。本教程还介绍了如何创建自定义元数据并检索它。但没有关于如何检索它的代码示例。
通过阅读Polymer.dart中的@published元数据等一些实现,我找到了方法。https://www.dartlang.org/articles/reflection-with-mirrors/
https://api.dartlang.org/apidocs/channels/stable/dartdoc-viewer/dart-mirrors#id_reflect
这是示例代码。
import 'dart:mirrors';
class todo {
final String who;
final String what;
const todo(this.who, this.what);
}
@todo('akira', 'add something')
class Foo {
@todo('naoto', 'do something')
String fooVariable = 'a';
@todo('kitano', 'change the name')
void fooMethod() {
}
}
void main() {
InstanceMirror im = reflect(new Foo());
ClassMirror classMirror = im.type;
// ClassMirror
classMirror.metadata.forEach((metadata) {
print(metadata.reflectee.who); // -> akira
print(metadata.reflectee.what); // -> add something
});
// VariableMirror
for (VariableMirror variable in classMirror.variables.values) {
print(variable.metadata.first.reflectee.who); // -> naoto
print(variable.metadata.first.reflectee.what); // -> do something
}
// MethodMirror
classMirror.methods.values.forEach((MethodMirror method) {
print(method.metadata.first.reflectee.who); // -> kitano
print(method.metadata.first.reflectee.what); // -> change the name
});
}
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