//===--- ASTSelectionRequirements.cpp - Clang refactoring library ---------===//
//
// 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 "clang/Tooling/Refactoring/RefactoringActionRuleRequirements.h"
#include "clang/AST/Attr.h"
#include <optional>

using namespace clang;
using namespace tooling;

Expected<SelectedASTNode>
ASTSelectionRequirement::evaluate(RefactoringRuleContext &Context) const {
  // FIXME: Memoize so that selection is evaluated only once.
  Expected<SourceRange> Range =
      SourceRangeSelectionRequirement::evaluate(Context);
  if (!Range)
    return Range.takeError();

  std::optional<SelectedASTNode> Selection =
      findSelectedASTNodes(Context.getASTContext(), *Range);
  if (!Selection)
    return Context.createDiagnosticError(
        Range->getBegin(), diag::err_refactor_selection_invalid_ast);
  return std::move(*Selection);
}

Expected<CodeRangeASTSelection> CodeRangeASTSelectionRequirement::evaluate(
    RefactoringRuleContext &Context) const {
  // FIXME: Memoize so that selection is evaluated only once.
  Expected<SelectedASTNode> ASTSelection =
      ASTSelectionRequirement::evaluate(Context);
  if (!ASTSelection)
    return ASTSelection.takeError();
  std::unique_ptr<SelectedASTNode> StoredSelection =
      std::make_unique<SelectedASTNode>(std::move(*ASTSelection));
  std::optional<CodeRangeASTSelection> CodeRange =
      CodeRangeASTSelection::create(Context.getSelectionRange(),
                                    *StoredSelection);
  if (!CodeRange)
    return Context.createDiagnosticError(
        Context.getSelectionRange().getBegin(),
        diag::err_refactor_selection_invalid_ast);
  Context.setASTSelection(std::move(StoredSelection));
  return std::move(*CodeRange);
}