dart - 如何在 Dart Analyzer / source-gen 中从某个元素获取 AstNode？

Question

我source_gen用来通过 Dart 解析一些 Dart 文件analyzer。

我正在扩展GeneratorForAnnotation<>和覆盖方法 FutureOr<String> generateForAnnotatedElement(Element element, ConstantReader annotation, BuildStep buildStep)。这个方法给了我一个基本元素，我导航它直到找到其他元素，比如 a MethodElement。

一旦我掌握了这个MethodElement，我想详细分析方法的块。我想要这样的东西：

AstNode node = methodElement.computeNode();

更详细地说：

class MyGenerator extends GeneratorForAnnotation<MyAnnotation> {

    @override
    FutureOr<String> generateForAnnotatedElement(
        Element element, ConstantReader annotation, BuildStep buildStep,
    ) {
      if (element is ClassElement)
        for (MethodElement methodElement in element.methods) {
          AstNode node = methodElement.computeNode();
          processMyNode(node);
        }
      else
        throw AssertionError();
    }
}

不幸的是，computeNode已弃用。如果我尝试调用它，我会得到：

NoSuchMethodError: Class 'RestrictedAnalysisContext' has no instance method 'resolveCompilationUnit' with matching arguments.
Receiver: Instance of 'RestrictedAnalysisContext'
Tried calling: resolveCompilationUnit(Instance of 'FileSource', Instance of 'LibraryElementImpl')
Found: resolveCompilationUnit(Source, LibraryElement) => CompilationUnit

我的问题：我怎样才能得到AstNode？

Answer 1

知道了：

AstNode getAstNodeFromElement(Element element) {
  AnalysisSession session = element.session;
  ParsedLibraryResult parsedLibResult = session.getParsedLibraryByElement(element.library);
  ElementDeclarationResult elDeclarationResult = parsedLibResult.getElementDeclaration(element);
  return elDeclarationResult.node;
}