//===-- LibCxxRangesRefView.cpp -------------------------------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#include "LibCxx.h"

#include "lldb/Core/ValueObject.h"

#include "lldb/DataFormatters/FormattersHelpers.h"

#include "lldb/Utility/ConstString.h"

#include "llvm/ADT/APSInt.h"

using namespace lldb;

using namespace lldb_private;

using namespace lldb_private::formatters;

namespace lldb_private {

namespace formatters {

class LibcxxStdRangesRefViewSyntheticFrontEnd

    : public SyntheticChildrenFrontEnd {

public:

  LibcxxStdRangesRefViewSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);

  ~LibcxxStdRangesRefViewSyntheticFrontEnd() override = default;

  size_t CalculateNumChildren() override {

    // __range_ will be the sole child of this type

    return 1;

  }

  lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {

    // Since we only have a single child, return it

    assert(idx == 0);

    return m_range_sp;

  }

  bool Update() override;

  bool MightHaveChildren() override { return true; }

  size_t GetIndexOfChildWithName(ConstString name) override {

    // We only have a single child

    return 0;

  }

private:

  /// Pointer to the dereferenced __range_ member

  lldb::ValueObjectSP m_range_sp = nullptr;

};

lldb_private::formatters::LibcxxStdRangesRefViewSyntheticFrontEnd::

    LibcxxStdRangesRefViewSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)

    : SyntheticChildrenFrontEnd(*valobj_sp) {

  if (valobj_sp)

    Update();

}

bool lldb_private::formatters::LibcxxStdRangesRefViewSyntheticFrontEnd::

    Update() {

  ValueObjectSP range_ptr =

      GetChildMemberWithName(m_backend, {ConstString("__range_")});

  if (!range_ptr)

    return false;

  lldb_private::Status error;

  m_range_sp = range_ptr->Dereference(error);

  return error.Success();

}

lldb_private::SyntheticChildrenFrontEnd *

LibcxxStdRangesRefViewSyntheticFrontEndCreator(CXXSyntheticChildren *,

                                               lldb::ValueObjectSP valobj_sp) {

  if (!valobj_sp)

    return nullptr;

  CompilerType type = valobj_sp->GetCompilerType();

  if (!type.IsValid())

    return nullptr;

  return new LibcxxStdRangesRefViewSyntheticFrontEnd(valobj_sp);

}

} // namespace formatters

} // namespace lldb_private