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Fast regular expressions

, 29 Oct 2000 289.6K 4.5K 102
Compiles a regular expression into a fast automaton.
#include "stdafx.h"
#include "resource.h"
#include "SearchInterface.h"
#include "FileFindRecursive.h"
#include "SBDestination.h"
#include "DlgRegDefinitions.h"
#include <afxpriv.h>

CSearchBar::CSearchBar()
        :m_bCanceled(true),m_bQuit(false)
{
    
}
void CSearchBar::RegisterFileProcessor(CFileProcessor* pFileProcessor)
{
    struct RegDefinition{
        const char* pcszName;
        const char* pcszExpr;
    }regDefs[]={
        {"$Blank",      "[ \\t\\r\\n\\v]"},
        {"$Beg",        "[\\n]"},
        {"$End",        "\\r\\n"},
        {"$Int",        "[0-9]+"},
        {"$Frac",       "\\.[0-9]+"},
        {"$Exp",        "[Ee](\\+|-)?[0-9]+"},
        {"$CIdent",     "[A-Za-z_][A-Za-z_0-9]+"},
        {"$String",     "\"([^\"\\\\]|\\\\.)*\""},
        {"$CComment",   "/\\*([^*]|\\*/)*\\*/"},
        {"$CPComment",  "//[^\\n]*\\n"},
        {"$Hex",        "[0-9A-Fa-f]"},
        {"$Hex4",       "[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f]"},
        {"$Hex8",       "$Hex4 $Hex4"},
        {"$Hex12",      "$Hex8 $Hex4"}
    };
    for(int i=0;i<sizeof(regDefs)/sizeof(RegDefinition);i++){
        pFileProcessor->AddRegDefinition(regDefs[i].pcszName,regDefs[i].pcszExpr);
        m_vecDefs.push_back( make_pair(regDefs[i].pcszName,regDefs[i].pcszExpr));
    }
    m_vecFileProcessors.push_back(pFileProcessor);
}

IMPLEMENT_DYNCREATE(CSearchBar, CDialogBar)

BEGIN_MESSAGE_MAP(CSearchBar, CDialogBar)
    //{{AFX_MSG_MAP(CSearchBar)
    ON_UPDATE_COMMAND_UI(ID_SEARCH, OnUpdateSearch)
    ON_UPDATE_COMMAND_UI(IDC_BUTTON_DIRBROWSE,OnUpdateButtonDirBrowse)
    ON_UPDATE_COMMAND_UI(IDC_BUTTON_DEF,OnUpdateButtonDef)
	ON_BN_CLICKED(IDC_BUTTON_DIRBROWSE, OnButtonDirBrowse)
	ON_BN_CLICKED(IDC_BUTTON_REGHELP, OnButtonReghelp)
    ON_UPDATE_COMMAND_UI(IDC_BUTTON_REGHELP,OnUpdateButtonReghelp)
	ON_BN_CLICKED(ID_SEARCH, OnSearch)
	ON_BN_CLICKED(IDC_BUTTON_DEF, OnButtonDef)
	ON_WM_SIZE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CSearchBar::DoDataExchange(CDataExchange* pDX)
{
    DDX_Control(pDX,IDC_COMBO_WHAT,m_cmbSearch);
    DDX_Control(pDX,IDC_COMBO_DIRECTORY,m_cmbDir);
    DDX_Control(pDX,IDC_COMBO_TYP,m_cmbWildCards);
	DDX_Control(pDX,ID_SEARCH,m_btnSearch);
    DDX_Control(pDX,IDC_BUTTON_DIRBROWSE,m_btnDirBrowse);
    DDX_Control(pDX,IDC_PROGRESS,m_progress);
    DDX_Control(pDX,IDC_STATIC_COMMENT,m_static);
}

void CSearchBar::ShowDialog()
    {
        CFrameWnd* pMain= (CFrameWnd*)AfxGetMainWnd();
        if( pMain ){
            if(!IsWindow(m_hWnd)){
                if( Create(pMain,IDD_DLG_SEARCHBAR,CBRS_BOTTOM|CBRS_TOOLTIPS|CBRS_FLYBY,AFX_IDW_CONTROLBAR_FIRST+32) ){
                    UpdateData(false);
                    EnableDocking(CBRS_ALIGN_TOP|CBRS_ALIGN_BOTTOM);
                    pMain->DockControlBar(this,AFX_IDW_DOCKBAR_TOP);
                    m_cmbWildCards.SetCurSel(0);
                    m_cmbSearch.SetCurSel(0);
                    m_progress.ShowWindow(SW_HIDE);
                }
            }
        }
    }

void CSearchBar::OnUpdateSearch(CCmdUI* pCmdUI)
{
    pCmdUI->Enable(     CheckSearchEnableThis(m_cmbSearch)
                    &&  CheckSearchEnableThis(m_cmbWildCards) 
                    && CheckSearchEnableThis(m_cmbDir));
}
void CSearchBar::OnUpdateButtonDef(CCmdUI* pCmdUI)
{
    pCmdUI->Enable(true);
}
BOOL CSearchBar::PumpMessage()
{
	MSG msgCur;
	if (!::GetMessage(&msgCur, NULL, NULL, NULL))
	{
		return FALSE;
	}

	if (msgCur.message != WM_KICKIDLE && !AfxGetApp()->PreTranslateMessage(&msgCur))
	{
		::TranslateMessage(&msgCur);
		::DispatchMessage(&msgCur);
	}
	return TRUE;
}

void        CSearchBar::DoMessageLoop()
{
    bool bDoingBackgroundProcessing= true;
	int nOfLoops=0;
	while ( bDoingBackgroundProcessing && ++nOfLoops< 2) 
	{ 
		MSG msg;
		while ( ::PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE ) ) 
		{ 
			if ( !PumpMessage( ) ) 
			{ 
				bDoingBackgroundProcessing = FALSE; 
				::PostQuitMessage(0); 
                m_bQuit= true;
				break; 
			} 
		} 
		// let MFC do its idle processing
		LONG lIdle = 0;
		while ( AfxGetApp()->OnIdle(lIdle++ ) )
			;  
	}
}
bool CSearchBar::FindInThisFile(const char* pcszPathName,const char* pcszFileName,void* pThis)
{
    CSearchResult result;
    CSearchBar* pSB= ((CSearchBar*)pThis);

    pSB->DoMessageLoop();
    if( pSB->m_bCanceled ){
        return false;
    }
    pSB->m_progress.StepIt();
    pSB->NotifyProcessors(pcszPathName,pcszFileName,result);
    pSB->NotifyPresenters(result);
    pSB->m_nOccurences+= result.vecSearchInfo.size();
    if(pSB->m_nOccurences>=2000){
        AfxMessageBox(_T("Too many matches!"));
        pSB->m_bCanceled= true;
        return false;
    }
    return true;
}
bool CSearchBar::SetRegexp(CString strRegexp)
{
    for(int i=0;i<m_vecFileProcessors.size();i++){
        REXI_DefErr defErr= m_vecFileProcessors[i]->SetRegExpression((LPCSTR)strRegexp);
        if( defErr.eErrCode!=REXI_DefErr::eNoErr ){
            CString strFormat;
            if( defErr.nErrOffset < 0 || defErr.nErrOffset >= strRegexp.GetLength() ){
                defErr.nErrOffset= strRegexp.GetLength()-1;
            }
            strFormat.Format("%s; at '%s'",defErr.strErrMsg.c_str(),
                                (LPCSTR)strRegexp.Left(defErr.nErrOffset+1));
            AfxMessageBox(strFormat);
            return false;
        }
    }
    return true;
}
void CSearchBar::OnCancelSearch()
{
    if(!m_bCanceled){
        m_bCanceled= true;
    }
}
void CSearchBar::OnSearch() 
{
    if(!m_bCanceled){
        m_bCanceled= true;
        return;
    }

    CString strStartDirectory;
    m_cmbDir.GetWindowText(strStartDirectory);
	if( strStartDirectory.GetLength()>2&&strStartDirectory.Right(2)==_T(":\\") ){
		strStartDirectory= strStartDirectory.Left(strStartDirectory.GetLength()-1);
	}
	CFileFind findFile;
	if( !findFile.FindFile(strStartDirectory+"\\*.*") ){
		CString strMsg;
		strMsg.LoadString(IDS_FOLDER_NOTEXISTS);
		CString str;
		str.Format(IDS_FOLDER_NOTEXISTS,strStartDirectory);
		AfxMessageBox(str);
		m_cmbDir.SetFocus();
		return;
	}

    CString strWithComment;
    CString str;
    m_cmbSearch.GetWindowText(strWithComment);
    str= strWithComment;
    int nInd= -1;
    int nPos= -1;
    while( (nInd=str.Find("//<",nPos+1))!=-1 ){
        nPos= nInd;
    }
    if(nPos!=-1){
        str= str.Left(nPos);
    }
    if(!SetRegexp(str)){
        return;
    }
    InsertIntoCmbList(m_cmbSearch,strWithComment);
    m_nPieceNo=0;
    m_nOccurences=0;
    for(int i=0;i<m_vecSearchPresenters.size();i++){
        m_vecSearchPresenters[i]->Init();
    }
    m_bCanceled= false;
    m_btnSearch.SetWindowText(_T("Cancel"));
    m_progress.ShowWindow(SW_SHOW);
    m_progress.SetRange(0,1000);
    m_progress.SetPos(0);
    m_static.ShowWindow(SW_HIDE);
    CString strWildCards;
    m_cmbWildCards.GetWindowText(strWildCards);
    CFileFindRecursive oFind(strStartDirectory,strWildCards,FindInThisFile,this);
    if( m_bQuit ){
        m_bCanceled= true;
        return;
    }
    m_progress.ShowWindow(SW_HIDE);
    m_btnSearch.SetWindowText(_T("&Find"));
    CString strComment;
    strComment.Format(_T("%d Occurrence(s) have been found"),m_nOccurences);
    m_static.SetWindowText(strComment);
    m_static.ShowWindow(SW_SHOW);
    m_bCanceled= true;
}
void CSearchBar::NotifyProcessors(const char* pcszPathName,
                                  const char* pcszFileName,CSearchResult& result)
{
    for(int i=0;i<m_vecFileProcessors.size();i++){
        m_vecFileProcessors[i]->ProcessFile(result,pcszPathName,pcszFileName,true,true);
    }
}
void CSearchBar::NotifyPresenters(const CSearchResult& result)
{
    for(int i=0;i<m_vecSearchPresenters.size();i++){
        m_vecSearchPresenters[i]->PresentSearch(result,m_nPieceNo++);
    }
}
void CSearchBar::OnUpdateButtonDirBrowse(CCmdUI* pCmdUI)
{
    pCmdUI->Enable(true);
}

void CSearchBar::OnUpdateCancel(CCmdUI* pCmdUI)
{
    pCmdUI->Enable(true);
}
void CSearchBar::InsertIntoCmbList(CComboBox& rCmb,CString strToInsert)
{
    int nInd;
    if( (nInd=rCmb.FindStringExact(-1,strToInsert))==-1 ){
        rCmb.AddString(strToInsert);
        nInd= rCmb.GetCount()-1;
    }
    rCmb.SetCurSel(nInd);
}
void CSearchBar::OnButtonDirBrowse() 
{
    CSBDestination sb(this->m_hWnd, IDS_BFF_TITLE);
	sb.SetFlags(BIF_RETURNONLYFSDIRS | BIF_STATUSTEXT);
    CString str;
    m_cmbDir.GetWindowText(str);
	sb.SetInitialSelection(str);
	if (sb.SelectFolder())
	{
        InsertIntoCmbList(m_cmbDir,sb.GetSelectedFolder());
	}	
}
void CSearchBar::OnUpdateButtonReghelp(CCmdUI* pCmdUI)
{
    pCmdUI->Enable();
}
void CSearchBar::OnButtonReghelp() 
{
   CMenu menu;
   menu.LoadMenu(IDR_MENU_REGCONTEXT);

   CRect rect;
   GetDlgItem(IDC_BUTTON_REGHELP)->GetWindowRect(&rect);

   menu.GetSubMenu(0)->TrackPopupMenu(TPM_LEFTALIGN |TPM_RIGHTBUTTON, rect.TopLeft().x+rect.Width(), 
      rect.TopLeft().y, AfxGetMainWnd());
  
}


bool CSearchBar::CheckSearchEnableThis(CWnd& rWnd)
{
    CString str;
	rWnd.GetWindowText(str);
	str.TrimLeft();
	str.TrimRight();
    return !str.IsEmpty();
}



void CSearchBar::Resize(int cx,int cy)
{
    const cnMargin= 40;
    if( ::IsWindow(m_btnSearch.m_hWnd) ){
        if( cx>0 && cy>0){
            CRect rect;
            m_cmbSearch.GetWindowRect(rect);
            ScreenToClient(&rect);
            m_cmbSearch.SetWindowPos(NULL,0,0, cx-cnMargin-rect.left,rect.Height(), 
                                        SWP_NOMOVE|SWP_NOZORDER);
            m_cmbDir.SetWindowPos(NULL,0,0,cx-cnMargin-rect.left,rect.Height(), 
                                        SWP_NOMOVE|SWP_NOZORDER);
            m_cmbWildCards.SetWindowPos(NULL,0,0,cx-cnMargin-rect.left,rect.Height(), 
                                        SWP_NOMOVE|SWP_NOZORDER);
            m_progress.SetWindowPos(NULL,0,0,cx-(cnMargin+40)-rect.left,rect.Height()/2,
                                        SWP_NOMOVE|SWP_NOZORDER);
            m_btnDirBrowse.GetWindowRect(rect);
            ScreenToClient(&rect);
            m_btnDirBrowse.SetWindowPos(NULL,cx-cnMargin+5,rect.top,0,0,
                                         SWP_NOSIZE|SWP_NOZORDER);
        }
    }
}
void CSearchBar::CmbContentSerialize(CComboBox& rCmb,CArchive& ar)
{
    if( ar.IsStoring() ){
        ar << rCmb.GetCurSel();
        ar << rCmb.GetCount();
        for(int i=0;i<rCmb.GetCount();i++){
            CString str;
            rCmb.GetLBText(i,str);
            ar  <<  str;
        }
    }else{
        rCmb.ResetContent();
        int nCount;
        int nSel;
        ar  >> nSel;
        ar  >> nCount;
        for(int i=0;i<nCount;i++){
            CString str;
            ar  >>  str;
            rCmb.AddString(str);
        }
        rCmb.SetCurSel(nSel);
    }
}
void CSearchBar::Serialize(CArchive& ar)
{
    CmbContentSerialize(m_cmbSearch,    ar);
    CmbContentSerialize(m_cmbWildCards, ar);
    CmbContentSerialize(m_cmbDir,       ar);
}

void CSearchBar::OnButtonDef() 
{
    CDlgRegDefinitions dlgDefs(m_vecDefs);
    if(dlgDefs.DoModal()==IDOK){
        m_vecDefs= dlgDefs.m_vecDefs;
    }
}

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About the Author

Martin Holzherr

Switzerland Switzerland
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Article Copyright 2000 by Martin Holzherr
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