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Fast regular expressions

, 29 Oct 2000
Compiles a regular expression into a fast automaton.
// FileFindRecursive.h: Schnittstelle f�r die Klasse CFileFindRecursive.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_FILEFINDRECURSIVE_H__C340CE26_9439_11D4_86C5_1E1BBD000000__INCLUDED_)
#define AFX_FILEFINDRECURSIVE_H__C340CE26_9439_11D4_86C5_1E1BBD000000__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <vector>
using namespace std;

class CFileFindRecursive{
public:
      CFileFindRecursive(
          CString strStartDirectory,
          CString strWildCards,
          bool (*pProcessFile)(const char* pcszPathName,const char* pcszFileName,void* pData),
          void* pData)
          :m_pFuncProcessFile(pProcessFile),m_pData(pData),m_bCanceled(false)
      {
          int nPosPrev,nPos;
		  if( strWildCards.GetLength()>1 && strWildCards.Right(1)!=_T(";") ){
			  strWildCards+= _T(";");
		  }
          for(  nPos=0,nPosPrev=0; 
                (nPos= strWildCards.Find(';',nPos))!=-1;
                nPosPrev=nPos+1,nPos=nPosPrev){
              m_strWildCard= strWildCards.Mid(nPosPrev,nPos - nPosPrev);
              FindInThisDirectory(strStartDirectory);
          }
          
      }
      
private:
    void FindInThisDirectory(CString strDir)
    {
        CFileFind findFile;
        if( findFile.FindFile(strDir+"\\"+m_strWildCard) ){
            if( m_bCanceled )
                        return;
            while(findFile.FindNextFile()){
                if( !findFile.IsDirectory() ){
                    m_bCanceled= !m_pFuncProcessFile(findFile.GetFilePath(),
                        findFile.GetFileName(),m_pData);
                    if( m_bCanceled )
                        return;
                }
            }
        }
        Recurse(strDir);
    }
    void Recurse(CString str)
    {   
        CFileFind finder;
        CString strWildcard(str);
        strWildcard += _T("\\*.*");   // start working for files
        BOOL bWorking = finder.FindFile(strWildcard);   
        while (bWorking){
            if( m_bCanceled )
                        return;
            bWorking = finder.FindNextFile();
            if (finder.IsDots())         continue;
            if (finder.IsDirectory()){
                FindInThisDirectory(finder.GetFilePath());
            }
        }
    }

    CString             m_strWildCard;
    bool                m_bCanceled;
    bool (*m_pFuncProcessFile)(const char* pcszPathName,const char* pcszFileName,void* pData);
    void* m_pData;
};

#endif // !defined(AFX_FILEFINDRECURSIVE_H__C340CE26_9439_11D4_86C5_1E1BBD000000__INCLUDED_)

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About the Author

Martin Holzherr

Switzerland Switzerland
No Biography provided

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