cpdf_structtree.h

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// Copyright 2017 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
#ifndef CORE_FPDFDOC_CPDF_STRUCTTREE_H_
#define CORE_FPDFDOC_CPDF_STRUCTTREE_H_
 
#include <functional>
#include <map>
#include <memory>
#include <vector>
 
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fxcrt/bytestring.h"
#include "core/fxcrt/retain_ptr.h"
 
class CPDF_Document;
class CPDF_StructElement;
 
class CPDF_StructTree {
 public:
  static std::unique_ptr<CPDF_StructTree> LoadPage(
      const CPDF_Document* pDoc,
      RetainPtr<const CPDF_Dictionary> pPageDict);
 
  explicit CPDF_StructTree(const CPDF_Document* pDoc);
  ~CPDF_StructTree();
 
  size_t CountTopElements() const { return m_Kids.size(); }
  CPDF_StructElement* GetTopElement(size_t i) const { return m_Kids[i].Get(); }
  uint32_t GetPageObjNum() const { return m_pPage->GetObjNum(); }
  ByteString GetRoleMapNameFor(const ByteString& type) const;
 
 private:
  using StructElementMap = std::map<RetainPtr<const CPDF_Dictionary>,
                                    RetainPtr<CPDF_StructElement>,
                                    std::less<>>;
 
  void LoadPageTree(RetainPtr<const CPDF_Dictionary> pPageDict);
  RetainPtr<CPDF_StructElement> AddPageNode(
      RetainPtr<const CPDF_Dictionary> pDict,
      StructElementMap* map,
      int nLevel);
  bool AddTopLevelNode(const CPDF_Dictionary* pDict,
                       const RetainPtr<CPDF_StructElement>& pElement);
 
  RetainPtr<const CPDF_Dictionary> const m_pTreeRoot;
  RetainPtr<const CPDF_Dictionary> const m_pRoleMap;
  RetainPtr<const CPDF_Dictionary> m_pPage;
  std::vector<RetainPtr<CPDF_StructElement>> m_Kids;
};
 
#endif  // CORE_FPDFDOC_CPDF_STRUCTTREE_H_