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// Copyright 2014 PDFium Authors. All rights reserved.
// 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_FXCRT_XML_CFX_SAXREADER_H_
#define CORE_FXCRT_XML_CFX_SAXREADER_H_
#include <memory>
#include <stack>
#include <vector>
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/retain_ptr.h"
class CFX_SAXCommentContext;
class CFX_SAXContext;
class IFX_SeekableReadStream;
enum class CFX_SaxMode;
class CFX_SAXItem {
public:
enum class Type {
Unknown = 0,
Instruction,
Declaration,
Comment,
Tag,
Text,
CharData,
};
explicit CFX_SAXItem(uint32_t id)
: m_pNode(nullptr), m_eNode(Type::Unknown), m_dwID(id), m_bSkip(false) {}
CFX_SAXContext* m_pNode;
Type m_eNode;
const uint32_t m_dwID;
bool m_bSkip;
};
class CFX_SAXFile {
public:
CFX_SAXFile();
~CFX_SAXFile();
bool StartFile(const RetainPtr<IFX_SeekableReadStream>& pFile,
uint32_t dwStart,
uint32_t dwLen);
bool ReadNextBlock();
void Reset();
RetainPtr<IFX_SeekableReadStream> m_pFile;
uint32_t m_dwStart;
uint32_t m_dwEnd;
uint32_t m_dwCur;
uint8_t* m_pBuf;
uint32_t m_dwBufSize;
uint32_t m_dwBufIndex;
};
enum CFX_SaxParseMode {
CFX_SaxParseMode_NotConvert_amp = 1 << 0,
CFX_SaxParseMode_NotConvert_lt = 1 << 1,
CFX_SaxParseMode_NotConvert_gt = 1 << 2,
CFX_SaxParseMode_NotConvert_apos = 1 << 3,
CFX_SaxParseMode_NotConvert_quot = 1 << 4,
CFX_SaxParseMode_NotConvert_sharp = 1 << 5,
CFX_SaxParseMode_NotSkipSpace = 1 << 6
};
class CFX_SAXReader {
public:
class HandlerIface {
public:
virtual ~HandlerIface() {}
virtual CFX_SAXContext* OnTagEnter(const ByteStringView& bsTagName,
CFX_SAXItem::Type eType,
uint32_t dwStartPos) = 0;
virtual void OnTagAttribute(CFX_SAXContext* pTag,
const ByteStringView& bsAttri,
const ByteStringView& bsValue) = 0;
virtual void OnTagBreak(CFX_SAXContext* pTag) = 0;
virtual void OnTagData(CFX_SAXContext* pTag,
CFX_SAXItem::Type eType,
const ByteStringView& bsData,
uint32_t dwStartPos) = 0;
virtual void OnTagClose(CFX_SAXContext* pTag, uint32_t dwEndPos) = 0;
virtual void OnTagEnd(CFX_SAXContext* pTag,
const ByteStringView& bsTagName,
uint32_t dwEndPos) = 0;
virtual void OnTargetData(CFX_SAXContext* pTag,
CFX_SAXItem::Type eType,
const ByteStringView& bsData,
uint32_t dwStartPos) = 0;
};
CFX_SAXReader();
~CFX_SAXReader();
int32_t StartParse(const RetainPtr<IFX_SeekableReadStream>& pFile,
uint32_t dwStart = 0,
uint32_t dwLen = -1,
uint32_t dwParseMode = 0);
int32_t ContinueParse();
void SetHandler(HandlerIface* pHandler) { m_pHandler = pHandler; }
private:
void ParseInternal();
void SkipCurrentNode();
void AppendData(uint8_t ch);
void AppendName(uint8_t ch);
void ParseText();
void ParseNodeStart();
void ParseInstruction();
void ParseDeclOrComment();
void ParseDeclNode();
void ParseComment();
void ParseCommentContent();
void ParseTagName();
void ParseTagAttributeName();
void ParseTagAttributeEqual();
void ParseTagAttributeValue();
void ParseMaybeClose();
void ParseTagClose();
void ParseTagEnd();
void ParseTargetData();
void Reset();
void ClearData();
void ClearName();
void AppendToData(uint8_t ch);
void AppendToName(uint8_t ch);
void BackUpAndReplaceDataAt(int32_t index, uint8_t ch);
bool IsEntityStart(uint8_t ch) const;
bool IsEntityEnd(uint8_t ch) const;
int32_t CurrentDataIndex() const;
void Push();
void Pop();
CFX_SAXItem* GetCurrentItem() const;
bool SkipSpace(uint8_t ch);
void SkipNode();
void NotifyData();
void NotifyEnter();
void NotifyAttribute();
void NotifyBreak();
void NotifyClose();
void NotifyEnd();
void NotifyTargetData();
void ReallocDataBuffer();
void ReallocNameBuffer();
void ParseChar(uint8_t ch);
CFX_SAXFile m_File;
HandlerIface* m_pHandler;
int32_t m_iState;
std::stack<std::unique_ptr<CFX_SAXItem>> m_Stack;
uint32_t m_dwItemID;
CFX_SaxMode m_eMode;
CFX_SaxMode m_ePrevMode;
bool m_bCharData;
uint8_t m_CurByte;
uint32_t m_dwDataOffset;
std::stack<char> m_SkipStack;
uint8_t m_SkipChar;
uint32_t m_dwNodePos;
std::vector<uint8_t> m_Data;
int32_t m_iEntityStart; // Index into m_Data.
std::vector<uint8_t> m_Name;
uint32_t m_dwParseMode;
std::unique_ptr<CFX_SAXCommentContext> m_pCommentContext;
};
#endif // CORE_FXCRT_XML_CFX_SAXREADER_H_
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