cxfa_textparser.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 XFA_FXFA_CXFA_TEXTPARSER_H_
#define XFA_FXFA_CXFA_TEXTPARSER_H_
 
#include <stdint.h>
 
#include <map>
#include <memory>
#include <vector>
 
#include "core/fxcrt/css/cfx_css.h"
#include "core/fxcrt/css/cfx_csscomputedstyle.h"
#include "core/fxcrt/css/cfx_cssdeclaration.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/widestring.h"
#include "core/fxge/dib/fx_dib.h"
#include "fxjs/gc/heap.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "v8/include/cppgc/garbage-collected.h"
#include "xfa/fxfa/fxfa_basic.h"
 
class CFGAS_GEFont;
class CFX_CSSStyleSelector;
class CFX_CSSStyleSheet;
class CFX_XMLNode;
class CXFA_FFDoc;
class CXFA_TextProvider;
class CXFA_TextTabstopsContext;
 
class CXFA_TextParser : public cppgc::GarbageCollected<CXFA_TextParser> {
 public:
  class Context {
   public:
    Context();
    ~Context();
 
    void SetParentStyle(RetainPtr<const CFX_CSSComputedStyle> style);
    RetainPtr<const CFX_CSSComputedStyle> GetParentStyle() const {
      return m_pParentStyle;
    }
 
    void SetDisplay(CFX_CSSDisplay eDisplay) { m_eDisplay = eDisplay; }
    CFX_CSSDisplay GetDisplay() const { return m_eDisplay; }
 
    void SetDecls(std::vector<const CFX_CSSDeclaration*>&& decl);
    const std::vector<const CFX_CSSDeclaration*>& GetDecls() const {
      return decls_;
    }
 
   private:
    RetainPtr<const CFX_CSSComputedStyle> m_pParentStyle;
    CFX_CSSDisplay m_eDisplay = CFX_CSSDisplay::None;
    std::vector<const CFX_CSSDeclaration*> decls_;
  };
 
  CONSTRUCT_VIA_MAKE_GARBAGE_COLLECTED;
  virtual ~CXFA_TextParser();
 
  void Trace(cppgc::Visitor* visitor) const {}
 
  void Reset();
  void DoParse(const CFX_XMLNode* pXMLContainer,
               CXFA_TextProvider* pTextProvider);
 
  RetainPtr<CFX_CSSComputedStyle> CreateRootStyle(
      CXFA_TextProvider* pTextProvider);
  RetainPtr<CFX_CSSComputedStyle> ComputeStyle(
      const CFX_XMLNode* pXMLNode,
      RetainPtr<const CFX_CSSComputedStyle> pParentStyle);
 
  bool IsParsed() const { return m_bParsed; }
 
  XFA_AttributeValue GetVAlign(CXFA_TextProvider* pTextProvider) const;
 
  float GetTabInterval(const CFX_CSSComputedStyle* pStyle) const;
  int32_t CountTabs(const CFX_CSSComputedStyle* pStyle) const;
 
  bool IsSpaceRun(const CFX_CSSComputedStyle* pStyle) const;
  bool GetTabstops(const CFX_CSSComputedStyle* pStyle,
                   CXFA_TextTabstopsContext* pTabstopContext);
 
  RetainPtr<CFGAS_GEFont> GetFont(CXFA_FFDoc* doc,
                                  CXFA_TextProvider* pTextProvider,
                                  const CFX_CSSComputedStyle* pStyle) const;
  float GetFontSize(CXFA_TextProvider* pTextProvider,
                    const CFX_CSSComputedStyle* pStyle) const;
  int32_t GetHorScale(CXFA_TextProvider* pTextProvider,
                      const CFX_CSSComputedStyle* pStyle,
                      const CFX_XMLNode* pXMLNode) const;
  int32_t GetVerScale(CXFA_TextProvider* pTextProvider,
                      const CFX_CSSComputedStyle* pStyle) const;
  int32_t GetUnderline(CXFA_TextProvider* pTextProvider,
                       const CFX_CSSComputedStyle* pStyle) const;
  XFA_AttributeValue GetUnderlinePeriod(
      CXFA_TextProvider* pTextProvider,
      const CFX_CSSComputedStyle* pStyle) const;
  int32_t GetLinethrough(CXFA_TextProvider* pTextProvider,
                         const CFX_CSSComputedStyle* pStyle) const;
  FX_ARGB GetColor(CXFA_TextProvider* pTextProvider,
                   const CFX_CSSComputedStyle* pStyle) const;
  float GetBaseline(CXFA_TextProvider* pTextProvider,
                    const CFX_CSSComputedStyle* pStyle) const;
  float GetLineHeight(CXFA_TextProvider* pTextProvider,
                      const CFX_CSSComputedStyle* pStyle,
                      bool bFirst,
                      float fVerScale) const;
 
  absl::optional<WideString> GetEmbeddedObj(
      const CXFA_TextProvider* pTextProvider,
      const CFX_XMLNode* pXMLNode);
  Context* GetParseContextFromMap(const CFX_XMLNode* pXMLNode);
 
 protected:
  CXFA_TextParser();
 
  bool TagValidate(const WideString& str) const;
 
 private:
  class TagProvider {
   public:
    TagProvider();
    ~TagProvider();
 
    WideString GetTagName() { return m_wsTagName; }
 
    void SetTagName(const WideString& wsName) { m_wsTagName = wsName; }
    void SetAttribute(const WideString& wsAttr, const WideString& wsValue) {
      m_Attributes.insert({wsAttr, wsValue});
    }
 
    WideString GetAttribute(const WideString& wsAttr) {
      return m_Attributes[wsAttr];
    }
 
    bool m_bTagAvailable = false;
    bool m_bContent = false;
 
   private:
    WideString m_wsTagName;
    std::map<WideString, WideString> m_Attributes;
  };
 
  // static
  std::unique_ptr<TagProvider> ParseTagInfo(const CFX_XMLNode* pXMLNode);
 
  void InitCSSData(CXFA_TextProvider* pTextProvider);
  void ParseRichText(const CFX_XMLNode* pXMLNode,
                     const CFX_CSSComputedStyle* pParentStyle);
  std::unique_ptr<CFX_CSSStyleSheet> LoadDefaultSheetStyle();
  RetainPtr<CFX_CSSComputedStyle> CreateStyle(
      const CFX_CSSComputedStyle* pParentStyle);
 
  bool m_bParsed = false;
  bool m_cssInitialized = false;
  std::unique_ptr<CFX_CSSStyleSelector> m_pSelector;
  std::map<const CFX_XMLNode*, std::unique_ptr<Context>>
      m_mapXMLNodeToParseContext;
};
 
#endif  // XFA_FXFA_CXFA_TEXTPARSER_H_