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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 XFA_FDE_CSS_FDE_CSSSYNTAX_H_
#define XFA_FDE_CSS_FDE_CSSSYNTAX_H_
#include "core/fxcrt/cfx_retain_ptr.h"
#include "xfa/fde/css/fde_css.h"
#include "xfa/fgas/crt/fgas_stream.h"
class CFDE_CSSTextBuf {
public:
CFDE_CSSTextBuf();
~CFDE_CSSTextBuf();
bool AttachBuffer(const FX_WCHAR* pBuffer, int32_t iBufLen);
bool EstimateSize(int32_t iAllocSize);
int32_t LoadFromStream(const CFX_RetainPtr<IFGAS_Stream>& pTxtStream,
int32_t iStreamOffset,
int32_t iMaxChars,
bool& bEOS);
bool AppendChar(FX_WCHAR wch) {
if (m_iDatLen >= m_iBufLen && !ExpandBuf(m_iBufLen * 2))
return false;
m_pBuffer[m_iDatLen++] = wch;
return true;
}
void Clear() { m_iDatPos = m_iDatLen = 0; }
void Reset();
int32_t TrimEnd() {
while (m_iDatLen > 0 && m_pBuffer[m_iDatLen - 1] <= ' ') {
--m_iDatLen;
}
AppendChar(0);
return --m_iDatLen;
}
void Subtract(int32_t iStart, int32_t iLength);
bool IsEOF() const { return m_iDatPos >= m_iDatLen; }
FX_WCHAR GetAt(int32_t index) const { return m_pBuffer[index]; }
FX_WCHAR GetChar() const { return m_pBuffer[m_iDatPos]; }
FX_WCHAR GetNextChar() const {
return (m_iDatPos + 1 >= m_iDatLen) ? 0 : m_pBuffer[m_iDatPos + 1];
}
void MoveNext() { m_iDatPos++; }
int32_t GetLength() const { return m_iDatLen; }
const FX_WCHAR* GetBuffer() const { return m_pBuffer; }
protected:
bool ExpandBuf(int32_t iDesiredSize);
bool m_bExtBuf;
FX_WCHAR* m_pBuffer;
int32_t m_iBufLen;
int32_t m_iDatLen;
int32_t m_iDatPos;
};
#define FDE_CSSSYNTAXCHECK_AllowCharset 1
#define FDE_CSSSYNTAXCHECK_AllowImport 2
enum FDE_CSSSYNTAXMODE {
FDE_CSSSYNTAXMODE_RuleSet,
FDE_CSSSYNTAXMODE_Comment,
FDE_CSSSYNTAXMODE_AtRule,
FDE_CSSSYNTAXMODE_UnknownRule,
FDE_CSSSYNTAXMODE_Charset,
FDE_CSSSYNTAXMODE_Import,
FDE_CSSSYNTAXMODE_MediaRule,
FDE_CSSSYNTAXMODE_URI,
FDE_CSSSYNTAXMODE_MediaType,
FDE_CSSSYNTAXMODE_Selector,
FDE_CSSSYNTAXMODE_PropertyName,
FDE_CSSSYNTAXMODE_PropertyValue,
};
class CFDE_CSSSyntaxParser {
public:
CFDE_CSSSyntaxParser();
~CFDE_CSSSyntaxParser();
bool Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
int32_t iCSSPlaneSize,
int32_t iTextDataSize = 32,
bool bOnlyDeclaration = false);
bool Init(const FX_WCHAR* pBuffer,
int32_t iBufferSize,
int32_t iTextDatSize = 32,
bool bOnlyDeclaration = false);
FDE_CSSSyntaxStatus DoSyntaxParse();
const FX_WCHAR* GetCurrentString(int32_t& iLength) const;
protected:
void Reset(bool bOnlyDeclaration);
void SwitchMode(FDE_CSSSYNTAXMODE eMode);
int32_t SwitchToComment();
bool RestoreMode();
bool AppendChar(FX_WCHAR wch);
int32_t SaveTextData();
bool IsCharsetEnabled() const {
return (m_dwCheck & FDE_CSSSYNTAXCHECK_AllowCharset) != 0;
}
void DisableCharset() { m_dwCheck = FDE_CSSSYNTAXCHECK_AllowImport; }
bool IsImportEnabled() const;
void DisableImport() { m_dwCheck = 0; }
CFX_RetainPtr<IFGAS_Stream> m_pStream;
int32_t m_iStreamPos;
int32_t m_iPlaneSize;
CFDE_CSSTextBuf m_TextData;
CFDE_CSSTextBuf m_TextPlane;
int32_t m_iTextDatLen;
uint32_t m_dwCheck;
FDE_CSSSYNTAXMODE m_eMode;
FDE_CSSSyntaxStatus m_eStatus;
CFX_StackTemplate<FDE_CSSSYNTAXMODE> m_ModeStack;
};
#endif // XFA_FDE_CSS_FDE_CSSSYNTAX_H_
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