获取objective-C类的AST节点而不解析依赖关系

#include <iostream>
#include <string>
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/FileSystemOptions.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetOptions.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/Support/Host.h"

using namespace clang;
using namespace llvm;

class MyASTVisitor : public RecursiveASTVisitor<MyASTVisitor> {
public:
  bool VisitObjCInterfaceDecl(ObjCInterfaceDecl *decl) {
    std::cout << "Found Objective-C interface: " << decl->getNameAsString() << std::endl;
    // 可以在这里处理目标类的AST节点
    return true;
  }
};

class MyASTConsumer : public ASTConsumer {
public:
  bool HandleTopLevelDecl(DeclGroupRef declGroup) override {
    for (DeclGroupRef::iterator it = declGroup.begin(); it != declGroup.end(); ++it) {
      Decl *decl = *it;
      if (ObjCInterfaceDecl *interfaceDecl = dyn_cast<ObjCInterfaceDecl>(decl)) {
        visitor.VisitObjCInterfaceDecl(interfaceDecl);
      }
    }
    return true;
  }

private:
  MyASTVisitor visitor;
};

int main(int argc, char *argv[]) {
  if (argc < 2) {
    std::cerr << "Usage: ast_parser <filename>" << std::endl;
    return 1;
  }

  // 创建Clang相关实例
  CompilerInstance ci;
  ci.createDiagnostics();

  // 设置编译参数
  LangOptions langOpts;
  langOpts.ObjC1 = 1;
  langOpts.ObjC2 = 1;

  ci.getInvocation().setLangDefaults(langOpts, IK_ObjC);

  // 创建预处理器
  const FileEntry *file = ci.getFileManager().getFile(argv[1]);
  ci.getSourceManager().setMainFileID(ci.getSourceManager().createFileID(file, SourceLocation(), SrcMgr::C_User));
  ci.getPreprocessor().EnterMainSourceFile();
  ci.getDiagnosticClient().BeginSourceFile(ci.getLangOpts(), &ci.getPreprocessor());

  // 构建抽象语法树
  ASTConsumer *consumer = new MyASTConsumer();
  ParseAST(ci.getPreprocessor(), consumer, ci.getASTContext());

  // 清理资源
  ci.getDiagnosticClient().EndSourceFile();
  ci.getPreprocessor().EndSourceFile();
  ci.getASTContext().Idents.clear();
  ci.getASTContext().Selectors.clear();

  return 0;
}