text: // grepWin - regex search and replace for Windows
  
  // Copyright (C) 2007-2008, 2011-2013, 2019-2020 - Stefan Kueng
  
  // This program is free software; you can redistribute it and/or
  // modify it under the terms of the GNU General Public License
  // as published by the Free Software Foundation; either version 2
  // of the License, or (at your option) any later version.
  
  // This program is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // You should have received a copy of the GNU General Public License
  // along with this program; if not, write to the Free Software Foundation,
  // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  //
  #include "stdafx.h"
  #include "resource.h"
  #include "RegexTestDlg.h"
  #include "RegexReplaceFormatter.h"
  #include "Theme.h"
  #include "DarkModeHelper.h"
  #include <string>
  #include <Richedit.h>
  #pragma warning(push)
  #pragma warning(disable : 4996) // warning STL4010: Various members of std::allocator are deprecated in C++17
  #include <boost/regex.hpp>
  #pragma warning(pop)
  
  CRegexTestDlg::CRegexTestDlg(HWND hParent)
      : m_hParent(hParent)
      , bDotMatchesNewline(false)
      , bCaseSensitive(false)
      , m_themeCallbackId(0)
  {
  }
  
  CRegexTestDlg::~CRegexTestDlg(void)
  {
  }
  
  LRESULT CRegexTestDlg::DlgFunc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
  {
      UNREFERENCED_PARAMETER(lParam);
      switch (uMsg)
      {
          case WM_INITDIALOG:
          {
              m_themeCallbackId = CTheme::Instance().RegisterThemeChangeCallback(
                  [this]() {
                      CTheme::Instance().SetThemeForDialog(*this, CTheme::Instance().IsDarkTheme());
                      DarkModeHelper::Instance().AllowDarkModeForWindow(GetToolTipHWND(), CTheme::Instance().IsDarkTheme());
                  });
              CTheme::Instance().SetThemeForDialog(*this, CTheme::Instance().IsDarkTheme());
              DarkModeHelper::Instance().AllowDarkModeForWindow(GetToolTipHWND(), CTheme::Instance().IsDarkTheme());
  
              InitDialog(hwndDlg, IDI_GREPWIN);
              CLanguage::Instance().TranslateWindow(*this);
              // initialize the controls
              SetDlgItemText(hwndDlg, IDC_SEARCHTEXT, m_searchText.c_str());
              SetDlgItemText(hwndDlg, IDC_REPLACETEXT, m_replaceText.c_str());
  
              SetFocus(GetDlgItem(hwndDlg, IDC_SEARCHTEXT));
  
              m_resizer.Init(hwndDlg);
              m_resizer.UseSizeGrip(!CTheme::Instance().IsDarkTheme());
              m_resizer.AddControl(hwndDlg, IDC_TEXTCONTENT, RESIZER_TOPLEFTRIGHT);
              m_resizer.AddControl(hwndDlg, IDC_SEARCHTEXT, RESIZER_TOPLEFTRIGHT);
              m_resizer.AddControl(hwndDlg, IDC_REPLACETEXT, RESIZER_TOPLEFTRIGHT);
              m_resizer.AddControl(hwndDlg, IDC_REGEXMATCH, RESIZER_TOPLEFTRIGHT);
              m_resizer.AddControl(hwndDlg, IDC_REGEXREPLACED, RESIZER_TOPLEFTBOTTOMRIGHT);
              m_resizer.AddControl(hwndDlg, IDOK, RESIZER_BOTTOMRIGHT);
              m_resizer.AddControl(hwndDlg, IDCANCEL, RESIZER_BOTTOMRIGHT);
  
              SendMessage(GetDlgItem(*this, IDC_TEXTCONTENT), EM_SETEVENTMASK, 0, ENM_CHANGE);
              SendMessage(GetDlgItem(*this, IDC_TEXTCONTENT), EM_EXLIMITTEXT, 0, 200 * 1024);
              SendMessage(GetDlgItem(*this, IDC_REGEXREPLACED), EM_EXLIMITTEXT, 0, 200 * 1024);
          }
              return FALSE;
          case WM_COMMAND:
              return DoCommand(LOWORD(wParam), HIWORD(wParam));
          case WM_SIZE:
          {
              m_resizer.DoResize(LOWORD(lParam), HIWORD(lParam));
          }
          break;
          case WM_GETMINMAXINFO:
          {
              MINMAXINFO* mmi       = (MINMAXINFO*)lParam;
              mmi->ptMinTrackSize.x = m_resizer.GetDlgRect()->right;
              mmi->ptMinTrackSize.y = m_resizer.GetDlgRect()->bottom;
              return 0;
          }
          break;
          case WM_TIMER:
          {
              if (wParam == ID_REGEXTIMER)
              {
                  KillTimer(*this, ID_REGEXTIMER);
                  DoRegex();
              }
          }
          break;
          case WM_CLOSE:
              CTheme::Instance().RemoveRegisteredCallback(m_themeCallbackId);
              break;
          default:
              return FALSE;
      }
      return FALSE;
  }
  
  LRESULT CRegexTestDlg::DoCommand(int id, int msg)
  {
      switch (id)
      {
          case IDOK:
          {
              auto buf      = GetDlgItemText(IDC_SEARCHTEXT);
              m_searchText  = buf.get();
              buf           = GetDlgItemText(IDC_REPLACETEXT);
              m_replaceText = buf.get();
          }
              // fall through
          case IDCANCEL:
              EndDialog(*this, id);
              break;
          case IDC_TEXTCONTENT:
          {
              if (msg == EN_CHANGE)
              {
                  auto buf      = GetDlgItemText(IDC_TEXTCONTENT);
                  m_textContent = std::wstring(buf.get());
  
                  SetTimer(*this, ID_REGEXTIMER, 300, NULL);
              }
          }
          break;
          case IDC_SEARCHTEXT:
          {
              if (msg == EN_CHANGE)
              {
                  auto buf     = GetDlgItemText(IDC_SEARCHTEXT);
                  m_searchText = buf.get();
  
                  SetTimer(*this, ID_REGEXTIMER, 300, NULL);
              }
          }
          break;
          case IDC_REPLACETEXT:
          {
              if (msg == EN_CHANGE)
              {
                  auto buf      = GetDlgItemText(IDC_REPLACETEXT);
                  m_replaceText = buf.get();
  
                  SetTimer(*this, ID_REGEXTIMER, 300, NULL);
              }
          }
          break;
      }
      return 1;
  }
  
  void CRegexTestDlg::SetStrings(const std::wstring& search, const std::wstring& replace)
  {
      m_replaceText = replace;
      m_searchText  = search;
  }
  
  void CRegexTestDlg::DoRegex()
  {
      if (m_textContent.empty())
      {
          SetDlgItemText(*this, IDC_REGEXMATCH, TranslatedString(hResource, IDS_NOTESTTEXTAVAILABLE).c_str());
          SetDlgItemText(*this, IDC_REGEXREPLACED, TranslatedString(hResource, IDS_NOTESTTEXTAVAILABLE).c_str());
      }
      else if (m_searchText.empty())
      {
          SetDlgItemText(*this, IDC_REGEXMATCH, TranslatedString(hResource, IDS_SEARCHSTRINGEMPTY).c_str());
          SetDlgItemText(*this, IDC_REGEXREPLACED, TranslatedString(hResource, IDS_SEARCHSTRINGEMPTY).c_str());
      }
      else if (m_replaceText.empty())
      {
          SetDlgItemText(*this, IDC_REGEXREPLACED, TranslatedString(hResource, IDS_NOREPLACETEXT).c_str());
      }
  
      if (!m_textContent.empty())
      {
          std::wstring searchresult;
          std::wstring replaceresult;
          if (!m_searchText.empty())
          {
              std::wstring::const_iterator start, end;
              start = m_textContent.begin();
              end   = m_textContent.end();
              boost::match_results<std::wstring::const_iterator> what;
              try
              {
                  int ft = boost::regex::normal;
                  if (!bCaseSensitive)
                      ft |= boost::regbase::icase;
                  boost::wregex                                      expression = boost::wregex(m_searchText, ft);
                  boost::match_results<std::wstring::const_iterator> whatc;
                  boost::match_flag_type                             flags = boost::match_default;
                  if (!bDotMatchesNewline)
                      flags |= boost::match_not_dot_newline;
  
                  boost::match_flag_type rflags = boost::match_default | boost::format_all;
                  if (!bDotMatchesNewline)
                      rflags |= boost::match_not_dot_newline;
  
                  RegexReplaceFormatter replaceFmt(m_replaceText);
                  replaceFmt.SetReplacePair(L"${filepath}", L"c:\\grepwintest\\file.txt");
                  replaceFmt.SetReplacePair(L"${filename}", L"file");
                  replaceFmt.SetReplacePair(L"${fileext}", L"txt");
  
                  replaceresult = regex_replace(m_textContent, expression, replaceFmt, rflags);
  
                  while (boost::regex_search(start, end, whatc, expression, flags))
                  {
                      if (!searchresult.empty())
                          searchresult = searchresult + L"\r\n----------------------------\r\n";
                      std::wstring c(whatc[0].first, whatc[0].second);
                      searchresult = searchresult + c;
                      // update search position:
                      if (start == whatc[0].second)
                      {
                          if (start == end)
                              break;
                          ++start;
                      }
                      else
                          start = whatc[0].second;
                      // update flags:
                      flags |= boost::match_prev_avail;
                      flags |= boost::match_not_bob;
                  }
              }
              catch (const std::exception&)
              {
              }
              if (searchresult.empty())
                  SetDlgItemText(*this, IDC_REGEXMATCH, TranslatedString(hResource, IDS_NOMATCH).c_str());
              else
                  SetDlgItemText(*this, IDC_REGEXMATCH, searchresult.c_str());
          }
          if (!searchresult.empty())
              SetDlgItemText(*this, IDC_REGEXMATCH, searchresult.c_str());
          if (!replaceresult.empty())
              SetDlgItemText(*this, IDC_REGEXREPLACED, replaceresult.c_str());
      }
  }