Issue 1557 - Update to the recent libadblockplus to reduce additional updates in the logic later.

src/plugin/PluginFilter.cpp

Index: src/plugin/PluginFilter.cpp
diff --git a/src/plugin/PluginFilter.cpp b/src/plugin/PluginFilter.cpp
index 269f3a2214728ba6cd1c8c9f7fae892bff21ea12..a4661e8a9425e9bf7f3020c78ac0fd5df27c8265 100644
--- a/src/plugin/PluginFilter.cpp
+++ b/src/plugin/PluginFilter.cpp
@@ -15,750 +15,731 @@
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "PluginStdAfx.h"
-
-#include "PluginFilter.h"
-#include "PluginSettings.h"
-#include "PluginClient.h"
-#include "PluginClientFactory.h"
-#include "PluginMutex.h"
-#include "PluginSettings.h"
-#include "PluginSystem.h"
-#include "PluginClass.h"
-#include "mlang.h"
-
-#include "..\shared\CriticalSection.h"
-#include "..\shared\Utils.h"
-
-
-// The filters are described at http://adblockplus.org/en/filters
-
-static CriticalSection s_criticalSectionFilterMap;
-
-namespace
-{
-  struct GetHtmlElementAttributeResult
-  {
-    GetHtmlElementAttributeResult() : isAttributeFound(false)
-    {
-    }
-    std::wstring attributeValue;
-    bool isAttributeFound;
-  };
-
-  GetHtmlElementAttributeResult GetHtmlElementAttribute(IHTMLElement& htmlElement,
-    const ATL::CComBSTR& attributeName)
-  {
-    GetHtmlElementAttributeResult retValue;
-    ATL::CComVariant vAttr;
-    ATL::CComPtr<IHTMLElement4> htmlElement4;
-    if (FAILED(htmlElement.QueryInterface(&htmlElement4)) || !htmlElement4)
-    {
-      return retValue;
-    }
-    ATL::CComPtr<IHTMLDOMAttribute> attributeNode;
-    if (FAILED(htmlElement4->getAttributeNode(attributeName, &attributeNode)) || !attributeNode)
-    {
-      return retValue;
-    }
-    // we set that attribute found but it's not necessary that we can retrieve its value
-    retValue.isAttributeFound = true;
-    if (FAILED(attributeNode->get_nodeValue(&vAttr)))
-    {
-      return retValue;
-    }
-    if (vAttr.vt == VT_BSTR && vAttr.bstrVal)
-    {
-      retValue.attributeValue = vAttr.bstrVal;
-    }
-    else if (vAttr.vt == VT_I4)
-    {
-      retValue.attributeValue = std::to_wstring(vAttr.iVal);
-    }
-    return retValue;
-  }
-}
-
-// ============================================================================
-// CFilterElementHideAttrSelector
-// ============================================================================
-
-CFilterElementHideAttrSelector::CFilterElementHideAttrSelector() : m_type(TYPE_NONE), m_pos(POS_NONE), m_bstrAttr(NULL)
-{
-}
-
-CFilterElementHideAttrSelector::CFilterElementHideAttrSelector(const CFilterElementHideAttrSelector& filter)
-{
-  m_type = filter.m_type;
-  m_pos = filter.m_pos;
-  m_bstrAttr = filter.m_bstrAttr;
-
-  m_value = filter.m_value;
-}
-
-CFilterElementHideAttrSelector::~CFilterElementHideAttrSelector()
-{
-}
-
-
-// ============================================================================
-// CFilterElementHide
-// ============================================================================
-
-CFilterElementHide::CFilterElementHide(const CString& filterText) : m_filterText(filterText), m_type(ETraverserComplexType::TRAVERSER_TYPE_ERROR)
-{
-  // Find tag name, class or any (*)
-  CString filterString = filterText;
-
-  wchar_t firstTag = filterString.GetAt(0);
-  // Any tag
-  if (firstTag == '*')
-  {
-    filterString = filterString.Mid(1);
-  }
-  // Any tag (implicitely)
-  else if (firstTag == '[' || firstTag == '.' || firstTag == '#')
-  {
-  }
-  // Real tag
-  else if (isalnum(firstTag))
-  {
-    //TODO: Add support for descendant selectors
-    int pos = filterString.FindOneOf(L".#[(");
-
-    if (pos < 0)
-      pos = filterString.GetLength();
-    m_tag = filterString.Left(pos).MakeLower();
-
-    filterString = filterString.Mid(pos);
-  }
-  // Error
-  else
-  {
-    DEBUG_FILTER("Filter::Error parsing selector:" + filterText + " (invalid tag)");
-    throw std::runtime_error(CStringA("Filter::Error parsing selector:" + filterText + " (invalid tag)").GetString());
-  }
-
-  // Find Id and class name
-
-  if (!filterString.IsEmpty())
-  {
-    wchar_t firstId = filterString.GetAt(0);
-
-    // Id
-    if (firstId == '#')
-    {
-      int pos = filterString.Find('[');
-      if (pos < 0)
-      {
-        pos = filterString.GetLength();
-      }
-      m_tagId = filterString.Mid(1, pos - 1);
-      filterString = filterString.Mid(pos);
-      pos = m_tagId.Find(L".");
-      if (pos > 0)
-      {
-        m_tagClassName = m_tagId.Mid(pos + 1);
-        m_tagId = m_tagId.Left(pos);
-      }
-    }
-    // Class name
-    else if (firstId == '.')
-    {
-      int pos = filterString.Find('[');
-      if (pos < 0)
-      {
-        pos = filterString.GetLength();
-      }
-      m_tagClassName = filterString.Mid(1, pos - 1);
-      filterString = filterString.Mid(pos);
-    }
-  }
-
-  char chAttrStart = '[';
-  char chAttrEnd   = ']';
-
-  while (!filterString.IsEmpty())
-  {
-    if (filterString.GetAt(0) != chAttrStart)
-    {
-      DEBUG_FILTER("Filter::Error parsing selector:" + filterText + " (more data)");
-      throw std::runtime_error(CStringA("Filter::Error parsing selector:" + filterText + " (more data)").GetString());
-    }
-    int endPos = filterString.Find(']') ;
-    if (endPos < 0)
-    {
-      DEBUG_FILTER("Filter::Error parsing selector:" + filterText + " (more data)");
-      throw std::runtime_error(CStringA("Filter::Error parsing selector:" + filterText + " (more data)").GetString());
-    }
-        
-    CFilterElementHideAttrSelector attrSelector;
-
-    CString arg = filterString.Mid(1, endPos - 1);
-    filterString = filterString.Mid(endPos + 1);
-
-    int delimiterPos = arg.Find('=');
-    if (delimiterPos > 0)
-    {
-      attrSelector.m_value = arg.Mid(delimiterPos + 1);
-      if (attrSelector.m_value.GetLength() >= 2 && attrSelector.m_value.GetAt(0) == '\"' && attrSelector.m_value.GetAt(attrSelector.m_value.GetLength() - 1) == '\"')
-      {
-        attrSelector.m_value = attrSelector.m_value.Mid(1, attrSelector.m_value.GetLength() - 2);
-      }
-
-      if (arg.GetAt(delimiterPos - 1) == '^')
-      {
-        attrSelector.m_bstrAttr = arg.Left(delimiterPos - 1);
-        attrSelector.m_pos = CFilterElementHideAttrPos::STARTING;
-      }
-      else if (arg.GetAt(delimiterPos - 1) == '*')
-      {
-        attrSelector.m_bstrAttr = arg.Left(delimiterPos - 1);
-        attrSelector.m_pos = CFilterElementHideAttrPos::ANYWHERE;
-      }
-      else if (arg.GetAt(delimiterPos - 1) == '$')
-      {
-        attrSelector.m_bstrAttr = arg.Left(delimiterPos - 1);
-        attrSelector.m_pos = CFilterElementHideAttrPos::ENDING;
-      }
-      else
-      {
-        attrSelector.m_bstrAttr = arg.Left(delimiterPos);
-        attrSelector.m_pos = CFilterElementHideAttrPos::EXACT;
-      }
-    }
-    CString tag = attrSelector.m_bstrAttr;
-    if (tag == "style")
-    {
-      attrSelector.m_type = CFilterElementHideAttrType::STYLE;
-      attrSelector.m_value.MakeLower();
-    }
-    else if (tag == "id")
-    {
-      attrSelector.m_type = CFilterElementHideAttrType::ID;
-    }
-    else if (tag == "class")
-    {
-      attrSelector.m_type = CFilterElementHideAttrType::CLASS;
-    }
-    m_attributeSelectors.push_back(attrSelector);
-
-  }
-
-  // End check
-  if (!filterString.IsEmpty())
-  {
-    DEBUG_FILTER("Filter::Error parsing selector:" + filterFile + "/" + filterText + " (more data)")
-    throw new std::runtime_error(CStringA("Filter::Error parsing selector:"  + filterText + " (more data)").GetString());
-  }
-}
-
-CFilterElementHide::CFilterElementHide(const CFilterElementHide& filter)
-{
-  m_filterText = filter.m_filterText;
-
-  m_tagId = filter.m_tagId;
-  m_tagClassName = filter.m_tagClassName;
-
-  m_attributeSelectors = filter.m_attributeSelectors;
-
-  m_predecessor = filter.m_predecessor;
-}
-
-
-// ============================================================================
-// CFilter
-// ============================================================================
-
-CFilter::CFilter(const CFilter& filter)
-{
-  m_contentType = filter.m_contentType;
-  m_filterType  = filter.m_filterType;
-
-  m_isFirstParty = filter.m_isFirstParty;
-  m_isThirdParty = filter.m_isThirdParty;
-
-  m_isMatchCase  = filter.m_isMatchCase;
-  m_isFromStart = filter.m_isFromStart;
-  m_isFromEnd = filter.m_isFromEnd;
-
-  m_filterText = filter.m_filterText;
-
-  m_hitCount = filter.m_hitCount;
-}
-
-
-CFilter::CFilter() : m_isMatchCase(false), m_isFirstParty(false), m_isThirdParty(false), m_contentType(CFilter::contentTypeAny),
-  m_isFromStart(false), m_isFromEnd(false), m_hitCount(0)
-{
-}
-
-
-bool CFilterElementHide::IsMatchFilterElementHide(IHTMLElement* pEl) const
-{
-  HRESULT hr;
-
-  if (!m_tagId.IsEmpty())
-  {
-    CComBSTR id;
-    hr = pEl->get_id(&id);
-    if ((hr != S_OK) || (id != CComBSTR(m_tagId)))
-    {
-      return false;
-    }
-  }
-  if (!m_tagClassName.IsEmpty())
-  {
-    CComBSTR classNameBSTR;
-    hr = pEl->get_className(&classNameBSTR);
-    if (hr == S_OK)
-    {
-      CString className = classNameBSTR;
-      int start = 0;
-      CString specificClass;
-      bool foundMatch = false;
-      while ((specificClass = className.Tokenize(L" ", start)) != L"")
-      {
-        // TODO: Consider case of multiple classes. (m_tagClassName can be something like "foo.bar")
-        if (specificClass == m_tagClassName)
-        {
-          foundMatch = true;
-        }
-      }
-      if (!foundMatch)
-      {
-        return false;
-      }
-    }
-  }
-  if (!m_tag.IsEmpty())
-  {
-    CComBSTR tagName;
-    hr = pEl->get_tagName(&tagName);
-    tagName.ToLower();
-    if ((hr != S_OK) || (tagName != CComBSTR(m_tag)))
-    {
-      return false;
-    }
-  }
-
-  // Check attributes
-  for (std::vector<CFilterElementHideAttrSelector>::const_iterator attrIt = m_attributeSelectors.begin(); 
-        attrIt != m_attributeSelectors.end(); ++ attrIt)
-  {
-    ATL::CString value;
-    bool attrFound = false;
-    if (attrIt->m_type == CFilterElementHideAttrType::STYLE)
-    {
-      CComPtr<IHTMLStyle> pStyle;
-      if (SUCCEEDED(pEl->get_style(&pStyle)) && pStyle)
-      {
-        CComBSTR bstrStyle;
-
-        if (SUCCEEDED(pStyle->get_cssText(&bstrStyle)) && bstrStyle)
-        {
-          value = bstrStyle;
-          value.MakeLower();
-          attrFound = true;
-        }
-      }
-    }
-    else if (attrIt->m_type == CFilterElementHideAttrType::CLASS)
-    {
-      CComBSTR bstrClassNames;
-      if (SUCCEEDED(pEl->get_className(&bstrClassNames)) && bstrClassNames)
-      {
-        value = bstrClassNames;
-        attrFound = true;
-      }
-    }
-    else if (attrIt->m_type == CFilterElementHideAttrType::ID)
-    {
-      CComBSTR bstrId;
-      if (SUCCEEDED(pEl->get_id(&bstrId)) && bstrId)
-      {
-        value = bstrId;
-        attrFound = true;
-      }
-    }
-    else
-    {
-      auto attributeValue = GetHtmlElementAttribute(*pEl, attrIt->m_bstrAttr);
-      if (attrFound = attributeValue.isAttributeFound)
-      {
-        value = ToCString(attributeValue.attributeValue);
-      }
-    }
-
-    if (attrFound)
-    {
-      if (attrIt->m_pos == CFilterElementHideAttrPos::EXACT)
-      {
-        // TODO: IE rearranges the style attribute completely. Figure out if anything can be done about it.
-        if (value != attrIt->m_value)
-          return false;
-      }
-      else if (attrIt->m_pos == CFilterElementHideAttrPos::STARTING)
-      {
-        if (value.Left(attrIt->m_value.GetLength()) != attrIt->m_value)
-          return false;
-      }
-      else if (attrIt->m_pos == CFilterElementHideAttrPos::ENDING)
-      {
-        if (value.Right(attrIt->m_value.GetLength()) != attrIt->m_value)
-          return false;
-      }
-      else if (attrIt->m_pos == CFilterElementHideAttrPos::ANYWHERE)
-      {
-        if (value.Find(attrIt->m_value) < 0)
-          return false;
-      }
-      else if (attrIt->m_value.IsEmpty())
-      {
-        return true;
-      }
-    }
-    else
-    {
-      return false;
-    }
-  }
-
-  if (m_predecessor)
-  {
-    CComPtr<IHTMLElement> pDomPredecessor;
-    HRESULT hr = S_FALSE;
-    switch (m_predecessor->m_type)
-    {
-    case ETraverserComplexType::TRAVERSER_TYPE_PARENT:
-      hr = pEl->get_parentElement(&pDomPredecessor);
-      break;
-    case ETraverserComplexType::TRAVERSER_TYPE_IMMEDIATE:
-      hr = S_FALSE;
-      CComQIPtr<IHTMLDOMNode> pPrevSiblingNode = pEl;
-      long type = 0;
-      while (pPrevSiblingNode && type != 1)
-      {
-        IHTMLDOMNode* tmpNode;
-        pPrevSiblingNode->get_previousSibling(&tmpNode);
-        pPrevSiblingNode.Attach(tmpNode);
-        if (pPrevSiblingNode)
-        {
-          hr = pPrevSiblingNode->get_nodeType(&type);
-          if (hr != S_OK)
-            pPrevSiblingNode.Release();
-        }
-      }
-
-      if (pPrevSiblingNode)
-        hr = pPrevSiblingNode.QueryInterface(&pDomPredecessor);
-      else
-        return false;
-      break;
-    }
-    if (hr != S_OK)
-      return false;
-    return m_predecessor->IsMatchFilterElementHide(pDomPredecessor);
-  }
-
-  return true;
-}
-
-
-
-// ============================================================================
-// CPluginFilter
-// ============================================================================
-
-CPluginFilter::CPluginFilter(const CString& dataPath) : m_dataPath(dataPath)
-{
-  m_contentMapText[CFilter::contentTypeDocument] = "DOCUMENT";
-  m_contentMapText[CFilter::contentTypeObject] = "OBJECT";
-  m_contentMapText[CFilter::contentTypeObjectSubrequest] = "OBJECT_SUBREQUEST";
-  m_contentMapText[CFilter::contentTypeImage] = "IMAGE";
-  m_contentMapText[CFilter::contentTypeScript] = "SCRIPT";
-  m_contentMapText[CFilter::contentTypeOther] = "OTHER";
-  m_contentMapText[CFilter::contentTypeUnknown] = "OTHER";
-  m_contentMapText[CFilter::contentTypeSubdocument] = "SUBDOCUMENT";
-  m_contentMapText[CFilter::contentTypeStyleSheet] = "STYLESHEET";
-  m_contentMapText[CFilter::contentTypeXmlHttpRequest] = "XMLHTTPREQUEST";
-
-  ClearFilters(); 
-}
-
-
-bool CPluginFilter::AddFilterElementHide(CString filterText)
-{
-  DEBUG_FILTER("Input: " + filterText + " filterFile" + filterFile);
-  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
-  {
-    CString filterString  = filterText;
-    // Create filter descriptor
-    std::auto_ptr<CFilterElementHide> filter;
-
-    CString wholeFilterString = filterString;
-    wchar_t separatorChar;
-    do
-    {
-      int chunkEnd = filterText.FindOneOf(L"+>");
-      if (chunkEnd > 0)
-      {
-        separatorChar = filterText.GetAt(chunkEnd);
-      }
-      else
-      {
-        chunkEnd = filterText.GetLength();
-        separatorChar = L'\0';
-      }
-
-      CString filterChunk = filterText.Left(chunkEnd).TrimRight();
-      std::auto_ptr<CFilterElementHide> filterParent(filter);
-
-      filter.reset(new CFilterElementHide(filterChunk));
-
-      if (filterParent.get() != 0)
-      {
-        filter->m_predecessor.reset(filterParent.release());
-      }
-
-      if (separatorChar != L'\0') // complex selector
-      {
-        filterText = filterText.Mid(chunkEnd + 1).TrimLeft();
-        if (separatorChar == '+')
-          filter->m_type = CFilterElementHide::TRAVERSER_TYPE_IMMEDIATE;
-        else if (separatorChar == '>')
-          filter->m_type = CFilterElementHide::TRAVERSER_TYPE_PARENT;
-      }
-      else // Terminating element (simple selector)
-      {
-        if (!filter->m_tagId.IsEmpty())
-        {
-          m_elementHideTagsId.insert(std::make_pair(std::make_pair(filter->m_tag, filter->m_tagId), *filter));
-        }
-        else if (!filter->m_tagClassName.IsEmpty())
-        {
-          m_elementHideTagsClass.insert(std::make_pair(std::make_pair(filter->m_tag, filter->m_tagClassName), *filter));
-        }
-        else
-        {
-          std::pair<CString, CFilterElementHide> pair = std::make_pair(filter->m_tag, *filter);
-          m_elementHideTags.insert(pair);
-        }
-      }
-    } while (separatorChar != '\0');
-  }
-
-  return true;
-}
-
-bool CPluginFilter::IsElementHidden(const std::wstring& tag, IHTMLElement* pEl, const std::wstring& domain, const std::wstring& indent) const
-{
-  CString tagCString = ToCString(tag);
-
-  CString id;
-  CComBSTR bstrId;
-  if (SUCCEEDED(pEl->get_id(&bstrId)) && bstrId)
-  {
-    id = bstrId;
-  }
-
-  CString classNames;
-  CComBSTR bstrClassNames;
-  if (SUCCEEDED(pEl->get_className(&bstrClassNames)) && bstrClassNames)
-  {
-    classNames = bstrClassNames;
-  }
-
-  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
-  {
-    // Search tag/id filters
-    if (!id.IsEmpty())
-    {
-      std::pair<TFilterElementHideTagsNamed::const_iterator, TFilterElementHideTagsNamed::const_iterator> idItEnum =
-        m_elementHideTagsId.equal_range(std::make_pair(tagCString, id));
-      for (TFilterElementHideTagsNamed::const_iterator idIt = idItEnum.first; idIt != idItEnum.second; idIt ++)
-      {
-        if (idIt->second.IsMatchFilterElementHide(pEl))
-        {
-#ifdef ENABLE_DEBUG_RESULT
-          DEBUG_HIDE_EL(indent + "HideEl::Found (tag/id) filter:" + idIt->second.m_filterText)
-            CPluginDebug::DebugResultHiding(tagCString, L"id:" + id, idIt->second.m_filterText);
-#endif
-          return true;
-        }
-      }
-
-      // Search general id
-      idItEnum = m_elementHideTagsId.equal_range(std::make_pair("", id));
-      for (TFilterElementHideTagsNamed::const_iterator idIt = idItEnum.first; idIt != idItEnum.second; idIt ++)
-      {
-        if (idIt->second.IsMatchFilterElementHide(pEl))
-        {
-#ifdef ENABLE_DEBUG_RESULT
-          DEBUG_HIDE_EL(indent + "HideEl::Found (?/id) filter:" + idIt->second.m_filterText)
-            CPluginDebug::DebugResultHiding(tagCString, L"id:" + id, idIt->second.m_filterText);
-#endif
-          return true;
-        }
-      }
-    }
-
-    // Search tag/className filters
-    if (!classNames.IsEmpty())
-    {
-      int pos = 0;
-      CString className = classNames.Tokenize(L" \t\n\r", pos);
-      while (pos >= 0)
-      {
-        std::pair<TFilterElementHideTagsNamed::const_iterator, TFilterElementHideTagsNamed::const_iterator> classItEnum = 
-          m_elementHideTagsClass.equal_range(std::make_pair(tagCString, className));
-
-        for (TFilterElementHideTagsNamed::const_iterator classIt = classItEnum.first; classIt != classItEnum.second; ++classIt)
-        {
-          if (classIt->second.IsMatchFilterElementHide(pEl))
-          {
-#ifdef ENABLE_DEBUG_RESULT
-            DEBUG_HIDE_EL(indent + "HideEl::Found (tag/class) filter:" + classIt->second.m_filterText)
-              CPluginDebug::DebugResultHiding(tagCString, L"class:" + className, classIt->second.m_filterText);
-#endif
-            return true;
-          }
-        }
-
-        // Search general class name
-        classItEnum = m_elementHideTagsClass.equal_range(std::make_pair("", className));
-        for (TFilterElementHideTagsNamed::const_iterator classIt = classItEnum.first; classIt != classItEnum.second; ++ classIt)
-        {
-          if (classIt->second.IsMatchFilterElementHide(pEl))
-          {
-#ifdef ENABLE_DEBUG_RESULT
-            DEBUG_HIDE_EL(indent + "HideEl::Found (?/class) filter:" + classIt->second.m_filterText)
-              CPluginDebug::DebugResultHiding(tagCString, "class:" + className, classIt->second.m_filterText);
-#endif
-            return true;
-          }
-        }
-
-        // Next class name
-        className = classNames.Tokenize(L" \t\n\r", pos);
-      }
-    }
-
-    // Search tag filters
-    std::pair<TFilterElementHideTags::const_iterator, TFilterElementHideTags::const_iterator> tagItEnum 
-      = m_elementHideTags.equal_range(tagCString);
-    for (TFilterElementHideTags::const_iterator tagIt = tagItEnum.first; tagIt != tagItEnum.second; ++ tagIt)
-    {
-      if (tagIt->second.IsMatchFilterElementHide(pEl))
-      {
-#ifdef ENABLE_DEBUG_RESULT
-        DEBUG_HIDE_EL(indent + "HideEl::Found (tag) filter:" + tagIt->second.m_filterText)
-          CPluginDebug::DebugResultHiding(tagCString, "-", tagIt->second.m_filterText);
-#endif
-        return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-bool CPluginFilter::LoadHideFilters(std::vector<std::wstring> filters)
-{
-  ClearFilters();
-  bool isRead = false;
-  CPluginClient* client = CPluginClient::GetInstance();
-
-  // Parse hide string
-  int pos = 0;
-  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
-  {
-    for (std::vector<std::wstring>::iterator it = filters.begin(); it < filters.end(); ++it)
-    {
-      CString filter((*it).c_str());
-      // If the line is not commented out
-      if (!filter.Trim().IsEmpty() && filter.GetAt(0) != '!' && filter.GetAt(0) != '[')
-      {
-        int filterType = 0;
-
-        // See http://adblockplus.org/en/filters for further documentation
-
-        try
-        {
-          AddFilterElementHide(filter);
-        }
-        catch(...)
-        {
-#ifdef ENABLE_DEBUG_RESULT
-          CPluginDebug::DebugResult(L"Error loading hide filter: " + filter);
-#endif
-        }
-      }
-    }
-  }
-
-  return isRead;
-}
-
-void CPluginFilter::ClearFilters()
-{
-  // Clear filter maps
-  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
-  {
-    for (int i = 0; i < 2; i++)
-    {
-      for (int j = 0; j < 2; j++)
-      {
-        m_filterMap[i][j].clear();
-      }
-      m_filterMapDefault[i].clear();
-    }
-
-    m_elementHideTags.clear();
-    m_elementHideTagsId.clear();
-    m_elementHideTagsClass.clear();
-  }
-}
-
-bool CPluginFilter::ShouldBlock(const std::wstring& src, int contentType, const std::wstring& domain, bool addDebug) const
-{
-  std::wstring srcTrimmed = TrimString(src);
-
-  // We should not block the empty string, so all filtering does not make sense
-  // Therefore we just return
-  if (srcTrimmed.empty())
-  {
-    return false;
-  }
-  CPluginSettings* settings = CPluginSettings::GetInstance();
-
-  CString type;
-  if (addDebug)
-  {
-    type = "OTHER";
-
-    std::map<int,CString>::const_iterator it = m_contentMapText.find(contentType);
-    if (it != m_contentMapText.end())
-    {
-      type = it->second;
-    }
-  }
-
-  CPluginClient* client = CPluginClient::GetInstance();
-  if (client->Matches(srcTrimmed, ToWstring(type), domain))
-  {
-    if (addDebug)
-    {
-      DEBUG_FILTER("Filter::ShouldBlock " + type + " YES")
-
-#ifdef ENABLE_DEBUG_RESULT
-        CPluginDebug::DebugResultBlocking(type, srcTrimmed, domain);
-#endif
-    }
-    return true;
-  }
-#ifdef ENABLE_DEBUG_RESULT
-  CPluginDebug::DebugResultIgnoring(type, srcTrimmed, domain);
-#endif
-  return false;
-}
+#include "PluginStdAfx.h"
+
+#include "PluginFilter.h"
+#include "PluginSettings.h"
+#include "PluginClient.h"
+#include "PluginClientFactory.h"
+#include "PluginMutex.h"
+#include "PluginSettings.h"
+#include "PluginSystem.h"
+#include "PluginClass.h"
+#include "mlang.h"
+
+#include "..\shared\CriticalSection.h"
+#include "..\shared\Utils.h"
+#include "..\shared\ContentType.h"
+
+
+// The filters are described at http://adblockplus.org/en/filters
+
+static CriticalSection s_criticalSectionFilterMap;
+
+namespace
+{
+  struct GetHtmlElementAttributeResult
+  {
+    GetHtmlElementAttributeResult() : isAttributeFound(false)
+    {
+    }
+    std::wstring attributeValue;
+    bool isAttributeFound;
+  };
+
+  GetHtmlElementAttributeResult GetHtmlElementAttribute(IHTMLElement& htmlElement,
+    const ATL::CComBSTR& attributeName)
+  {
+    GetHtmlElementAttributeResult retValue;
+    ATL::CComVariant vAttr;
+    ATL::CComPtr<IHTMLElement4> htmlElement4;
+    if (FAILED(htmlElement.QueryInterface(&htmlElement4)) || !htmlElement4)
+    {
+      return retValue;
+    }
+    ATL::CComPtr<IHTMLDOMAttribute> attributeNode;
+    if (FAILED(htmlElement4->getAttributeNode(attributeName, &attributeNode)) || !attributeNode)
+    {
+      return retValue;
+    }
+    // we set that attribute found but it's not necessary that we can retrieve its value
+    retValue.isAttributeFound = true;
+    if (FAILED(attributeNode->get_nodeValue(&vAttr)))
+    {
+      return retValue;
+    }
+    if (vAttr.vt == VT_BSTR && vAttr.bstrVal)
+    {
+      retValue.attributeValue = vAttr.bstrVal;
+    }
+    else if (vAttr.vt == VT_I4)
+    {
+      retValue.attributeValue = std::to_wstring(vAttr.iVal);
+    }
+    return retValue;
+  }
+}
+
+// ============================================================================
+// CFilterElementHideAttrSelector
+// ============================================================================
+
+CFilterElementHideAttrSelector::CFilterElementHideAttrSelector() : m_type(TYPE_NONE), m_pos(POS_NONE), m_bstrAttr(NULL)
+{
+}
+
+CFilterElementHideAttrSelector::CFilterElementHideAttrSelector(const CFilterElementHideAttrSelector& filter)
+{
+  m_type = filter.m_type;
+  m_pos = filter.m_pos;
+  m_bstrAttr = filter.m_bstrAttr;
+
+  m_value = filter.m_value;
+}
+
+CFilterElementHideAttrSelector::~CFilterElementHideAttrSelector()
+{
+}
+
+
+// ============================================================================
+// CFilterElementHide
+// ============================================================================
+
+CFilterElementHide::CFilterElementHide(const CString& filterText) : m_filterText(filterText), m_type(ETraverserComplexType::TRAVERSER_TYPE_ERROR)
+{
+  // Find tag name, class or any (*)
+  CString filterString = filterText;
+
+  wchar_t firstTag = filterString.GetAt(0);
+  // Any tag
+  if (firstTag == '*')
+  {
+    filterString = filterString.Mid(1);
+  }
+  // Any tag (implicitely)
+  else if (firstTag == '[' || firstTag == '.' || firstTag == '#')
+  {
+  }
+  // Real tag
+  else if (isalnum(firstTag))
+  {
+    //TODO: Add support for descendant selectors
+    int pos = filterString.FindOneOf(L".#[(");
+
+    if (pos < 0)
+      pos = filterString.GetLength();
+    m_tag = filterString.Left(pos).MakeLower();
+
+    filterString = filterString.Mid(pos);
+  }
+  // Error
+  else
+  {
+    DEBUG_FILTER("Filter::Error parsing selector:" + filterText + " (invalid tag)");
+    throw std::runtime_error(CStringA("Filter::Error parsing selector:" + filterText + " (invalid tag)").GetString());
+  }
+
+  // Find Id and class name
+
+  if (!filterString.IsEmpty())
+  {
+    wchar_t firstId = filterString.GetAt(0);
+
+    // Id
+    if (firstId == '#')
+    {
+      int pos = filterString.Find('[');
+      if (pos < 0)
+      {
+        pos = filterString.GetLength();
+      }
+      m_tagId = filterString.Mid(1, pos - 1);
+      filterString = filterString.Mid(pos);
+      pos = m_tagId.Find(L".");
+      if (pos > 0)
+      {
+        m_tagClassName = m_tagId.Mid(pos + 1);
+        m_tagId = m_tagId.Left(pos);
+      }
+    }
+    // Class name
+    else if (firstId == '.')
+    {
+      int pos = filterString.Find('[');
+      if (pos < 0)
+      {
+        pos = filterString.GetLength();
+      }
+      m_tagClassName = filterString.Mid(1, pos - 1);
+      filterString = filterString.Mid(pos);
+    }
+  }
+
+  char chAttrStart = '[';
+  char chAttrEnd   = ']';
+
+  while (!filterString.IsEmpty())
+  {
+    if (filterString.GetAt(0) != chAttrStart)
+    {
+      DEBUG_FILTER("Filter::Error parsing selector:" + filterText + " (more data)");
+      throw std::runtime_error(CStringA("Filter::Error parsing selector:" + filterText + " (more data)").GetString());
+    }
+    int endPos = filterString.Find(']') ;
+    if (endPos < 0)
+    {
+      DEBUG_FILTER("Filter::Error parsing selector:" + filterText + " (more data)");
+      throw std::runtime_error(CStringA("Filter::Error parsing selector:" + filterText + " (more data)").GetString());
+    }
+        
+    CFilterElementHideAttrSelector attrSelector;
+
+    CString arg = filterString.Mid(1, endPos - 1);
+    filterString = filterString.Mid(endPos + 1);
+
+    int delimiterPos = arg.Find('=');
+    if (delimiterPos > 0)
+    {
+      attrSelector.m_value = arg.Mid(delimiterPos + 1);
+      if (attrSelector.m_value.GetLength() >= 2 && attrSelector.m_value.GetAt(0) == '\"' && attrSelector.m_value.GetAt(attrSelector.m_value.GetLength() - 1) == '\"')
+      {
+        attrSelector.m_value = attrSelector.m_value.Mid(1, attrSelector.m_value.GetLength() - 2);
+      }
+
+      if (arg.GetAt(delimiterPos - 1) == '^')
+      {
+        attrSelector.m_bstrAttr = arg.Left(delimiterPos - 1);
+        attrSelector.m_pos = CFilterElementHideAttrPos::STARTING;
+      }
+      else if (arg.GetAt(delimiterPos - 1) == '*')
+      {
+        attrSelector.m_bstrAttr = arg.Left(delimiterPos - 1);
+        attrSelector.m_pos = CFilterElementHideAttrPos::ANYWHERE;
+      }
+      else if (arg.GetAt(delimiterPos - 1) == '$')
+      {
+        attrSelector.m_bstrAttr = arg.Left(delimiterPos - 1);
+        attrSelector.m_pos = CFilterElementHideAttrPos::ENDING;
+      }
+      else
+      {
+        attrSelector.m_bstrAttr = arg.Left(delimiterPos);
+        attrSelector.m_pos = CFilterElementHideAttrPos::EXACT;
+      }
+    }
+    CString tag = attrSelector.m_bstrAttr;
+    if (tag == "style")
+    {
+      attrSelector.m_type = CFilterElementHideAttrType::STYLE;
+      attrSelector.m_value.MakeLower();
+    }
+    else if (tag == "id")
+    {
+      attrSelector.m_type = CFilterElementHideAttrType::ID;
+    }
+    else if (tag == "class")
+    {
+      attrSelector.m_type = CFilterElementHideAttrType::CLASS;
+    }
+    m_attributeSelectors.push_back(attrSelector);
+
+  }
+
+  // End check
+  if (!filterString.IsEmpty())
+  {
+    DEBUG_FILTER("Filter::Error parsing selector:" + filterFile + "/" + filterText + " (more data)")
+    throw new std::runtime_error(CStringA("Filter::Error parsing selector:"  + filterText + " (more data)").GetString());
+  }
+}
+
+CFilterElementHide::CFilterElementHide(const CFilterElementHide& filter)
+{
+  m_filterText = filter.m_filterText;
+
+  m_tagId = filter.m_tagId;
+  m_tagClassName = filter.m_tagClassName;
+
+  m_attributeSelectors = filter.m_attributeSelectors;
+
+  m_predecessor = filter.m_predecessor;
+}
+
+
+// ============================================================================
+// CFilter
+// ============================================================================
+
+CFilter::CFilter(const CFilter& filter)
+{
+  m_contentType = filter.m_contentType;
+  m_filterType  = filter.m_filterType;
+
+  m_isFirstParty = filter.m_isFirstParty;
+  m_isThirdParty = filter.m_isThirdParty;
+
+  m_isMatchCase  = filter.m_isMatchCase;
+  m_isFromStart = filter.m_isFromStart;
+  m_isFromEnd = filter.m_isFromEnd;
+
+  m_filterText = filter.m_filterText;
+
+  m_hitCount = filter.m_hitCount;
+}
+
+
+CFilter::CFilter() : m_isMatchCase(false), m_isFirstParty(false),
+  m_isThirdParty(false), m_contentType(AdblockPlus::FilterEngine::ContentType::CONTENT_TYPE_OTHER),
+  m_isFromStart(false), m_isFromEnd(false), m_hitCount(0)
+{
+}
+
+
+bool CFilterElementHide::IsMatchFilterElementHide(IHTMLElement* pEl) const
+{
+  HRESULT hr;
+
+  if (!m_tagId.IsEmpty())
+  {
+    CComBSTR id;
+    hr = pEl->get_id(&id);
+    if ((hr != S_OK) || (id != CComBSTR(m_tagId)))
+    {
+      return false;
+    }
+  }
+  if (!m_tagClassName.IsEmpty())
+  {
+    CComBSTR classNameBSTR;
+    hr = pEl->get_className(&classNameBSTR);
+    if (hr == S_OK)
+    {
+      CString className = classNameBSTR;
+      int start = 0;
+      CString specificClass;
+      bool foundMatch = false;
+      while ((specificClass = className.Tokenize(L" ", start)) != L"")
+      {
+        // TODO: Consider case of multiple classes. (m_tagClassName can be something like "foo.bar")
+        if (specificClass == m_tagClassName)
+        {
+          foundMatch = true;
+        }
+      }
+      if (!foundMatch)
+      {
+        return false;
+      }
+    }
+  }
+  if (!m_tag.IsEmpty())
+  {
+    CComBSTR tagName;
+    hr = pEl->get_tagName(&tagName);
+    tagName.ToLower();
+    if ((hr != S_OK) || (tagName != CComBSTR(m_tag)))
+    {
+      return false;
+    }
+  }
+
+  // Check attributes
+  for (std::vector<CFilterElementHideAttrSelector>::const_iterator attrIt = m_attributeSelectors.begin(); 
+        attrIt != m_attributeSelectors.end(); ++ attrIt)
+  {
+    ATL::CString value;
+    bool attrFound = false;
+    if (attrIt->m_type == CFilterElementHideAttrType::STYLE)
+    {
+      CComPtr<IHTMLStyle> pStyle;
+      if (SUCCEEDED(pEl->get_style(&pStyle)) && pStyle)
+      {
+        CComBSTR bstrStyle;
+
+        if (SUCCEEDED(pStyle->get_cssText(&bstrStyle)) && bstrStyle)
+        {
+          value = bstrStyle;
+          value.MakeLower();
+          attrFound = true;
+        }
+      }
+    }
+    else if (attrIt->m_type == CFilterElementHideAttrType::CLASS)
+    {
+      CComBSTR bstrClassNames;
+      if (SUCCEEDED(pEl->get_className(&bstrClassNames)) && bstrClassNames)
+      {
+        value = bstrClassNames;
+        attrFound = true;
+      }
+    }
+    else if (attrIt->m_type == CFilterElementHideAttrType::ID)
+    {
+      CComBSTR bstrId;
+      if (SUCCEEDED(pEl->get_id(&bstrId)) && bstrId)
+      {
+        value = bstrId;
+        attrFound = true;
+      }
+    }
+    else
+    {
+      auto attributeValue = GetHtmlElementAttribute(*pEl, attrIt->m_bstrAttr);
+      if (attrFound = attributeValue.isAttributeFound)
+      {
+        value = ToCString(attributeValue.attributeValue);
+      }
+    }
+
+    if (attrFound)
+    {
+      if (attrIt->m_pos == CFilterElementHideAttrPos::EXACT)
+      {
+        // TODO: IE rearranges the style attribute completely. Figure out if anything can be done about it.
+        if (value != attrIt->m_value)
+          return false;
+      }
+      else if (attrIt->m_pos == CFilterElementHideAttrPos::STARTING)
+      {
+        if (value.Left(attrIt->m_value.GetLength()) != attrIt->m_value)
+          return false;
+      }
+      else if (attrIt->m_pos == CFilterElementHideAttrPos::ENDING)
+      {
+        if (value.Right(attrIt->m_value.GetLength()) != attrIt->m_value)
+          return false;
+      }
+      else if (attrIt->m_pos == CFilterElementHideAttrPos::ANYWHERE)
+      {
+        if (value.Find(attrIt->m_value) < 0)
+          return false;
+      }
+      else if (attrIt->m_value.IsEmpty())
+      {
+        return true;
+      }
+    }
+    else
+    {
+      return false;
+    }
+  }
+
+  if (m_predecessor)
+  {
+    CComPtr<IHTMLElement> pDomPredecessor;
+    HRESULT hr = S_FALSE;
+    switch (m_predecessor->m_type)
+    {
+    case ETraverserComplexType::TRAVERSER_TYPE_PARENT:
+      hr = pEl->get_parentElement(&pDomPredecessor);
+      break;
+    case ETraverserComplexType::TRAVERSER_TYPE_IMMEDIATE:
+      hr = S_FALSE;
+      CComQIPtr<IHTMLDOMNode> pPrevSiblingNode = pEl;
+      long type = 0;
+      while (pPrevSiblingNode && type != 1)
+      {
+        IHTMLDOMNode* tmpNode;
+        pPrevSiblingNode->get_previousSibling(&tmpNode);
+        pPrevSiblingNode.Attach(tmpNode);
+        if (pPrevSiblingNode)
+        {
+          hr = pPrevSiblingNode->get_nodeType(&type);
+          if (hr != S_OK)
+            pPrevSiblingNode.Release();
+        }
+      }
+
+      if (pPrevSiblingNode)
+        hr = pPrevSiblingNode.QueryInterface(&pDomPredecessor);
+      else
+        return false;
+      break;
+    }
+    if (hr != S_OK)
+      return false;
+    return m_predecessor->IsMatchFilterElementHide(pDomPredecessor);
+  }
+
+  return true;
+}
+
+
+
+// ============================================================================
+// CPluginFilter
+// ============================================================================
+
+CPluginFilter::CPluginFilter(const CString& dataPath) : m_dataPath(dataPath)
+{
+  ClearFilters();
+}
+
+
+bool CPluginFilter::AddFilterElementHide(CString filterText)
+{
+  DEBUG_FILTER("Input: " + filterText + " filterFile" + filterFile);
+  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
+  {
+    CString filterString  = filterText;
+    // Create filter descriptor
+    std::auto_ptr<CFilterElementHide> filter;
+
+    CString wholeFilterString = filterString;
+    wchar_t separatorChar;
+    do
+    {
+      int chunkEnd = filterText.FindOneOf(L"+>");
+      if (chunkEnd > 0)
+      {
+        separatorChar = filterText.GetAt(chunkEnd);
+      }
+      else
+      {
+        chunkEnd = filterText.GetLength();
+        separatorChar = L'\0';
+      }
+
+      CString filterChunk = filterText.Left(chunkEnd).TrimRight();
+      std::auto_ptr<CFilterElementHide> filterParent(filter);
+
+      filter.reset(new CFilterElementHide(filterChunk));
+
+      if (filterParent.get() != 0)
+      {
+        filter->m_predecessor.reset(filterParent.release());
+      }
+
+      if (separatorChar != L'\0') // complex selector
+      {
+        filterText = filterText.Mid(chunkEnd + 1).TrimLeft();
+        if (separatorChar == '+')
+          filter->m_type = CFilterElementHide::TRAVERSER_TYPE_IMMEDIATE;
+        else if (separatorChar == '>')
+          filter->m_type = CFilterElementHide::TRAVERSER_TYPE_PARENT;
+      }
+      else // Terminating element (simple selector)
+      {
+        if (!filter->m_tagId.IsEmpty())
+        {
+          m_elementHideTagsId.insert(std::make_pair(std::make_pair(filter->m_tag, filter->m_tagId), *filter));
+        }
+        else if (!filter->m_tagClassName.IsEmpty())
+        {
+          m_elementHideTagsClass.insert(std::make_pair(std::make_pair(filter->m_tag, filter->m_tagClassName), *filter));
+        }
+        else
+        {
+          std::pair<CString, CFilterElementHide> pair = std::make_pair(filter->m_tag, *filter);
+          m_elementHideTags.insert(pair);
+        }
+      }
+    } while (separatorChar != '\0');
+  }
+
+  return true;
+}
+
+bool CPluginFilter::IsElementHidden(const std::wstring& tag, IHTMLElement* pEl, const std::wstring& domain, const std::wstring& indent) const
+{
+  CString tagCString = ToCString(tag);
+
+  CString id;
+  CComBSTR bstrId;
+  if (SUCCEEDED(pEl->get_id(&bstrId)) && bstrId)
+  {
+    id = bstrId;
+  }
+
+  CString classNames;
+  CComBSTR bstrClassNames;
+  if (SUCCEEDED(pEl->get_className(&bstrClassNames)) && bstrClassNames)
+  {
+    classNames = bstrClassNames;
+  }
+
+  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
+  {
+    // Search tag/id filters
+    if (!id.IsEmpty())
+    {
+      std::pair<TFilterElementHideTagsNamed::const_iterator, TFilterElementHideTagsNamed::const_iterator> idItEnum =
+        m_elementHideTagsId.equal_range(std::make_pair(tagCString, id));
+      for (TFilterElementHideTagsNamed::const_iterator idIt = idItEnum.first; idIt != idItEnum.second; idIt ++)
+      {
+        if (idIt->second.IsMatchFilterElementHide(pEl))
+        {
+#ifdef ENABLE_DEBUG_RESULT
+          DEBUG_HIDE_EL(indent + "HideEl::Found (tag/id) filter:" + idIt->second.m_filterText)
+            CPluginDebug::DebugResultHiding(tagCString, L"id:" + id, idIt->second.m_filterText);
+#endif
+          return true;
+        }
+      }
+
+      // Search general id
+      idItEnum = m_elementHideTagsId.equal_range(std::make_pair("", id));
+      for (TFilterElementHideTagsNamed::const_iterator idIt = idItEnum.first; idIt != idItEnum.second; idIt ++)
+      {
+        if (idIt->second.IsMatchFilterElementHide(pEl))
+        {
+#ifdef ENABLE_DEBUG_RESULT
+          DEBUG_HIDE_EL(indent + "HideEl::Found (?/id) filter:" + idIt->second.m_filterText)
+            CPluginDebug::DebugResultHiding(tagCString, L"id:" + id, idIt->second.m_filterText);
+#endif
+          return true;
+        }
+      }
+    }
+
+    // Search tag/className filters
+    if (!classNames.IsEmpty())
+    {
+      int pos = 0;
+      CString className = classNames.Tokenize(L" \t\n\r", pos);
+      while (pos >= 0)
+      {
+        std::pair<TFilterElementHideTagsNamed::const_iterator, TFilterElementHideTagsNamed::const_iterator> classItEnum = 
+          m_elementHideTagsClass.equal_range(std::make_pair(tagCString, className));
+
+        for (TFilterElementHideTagsNamed::const_iterator classIt = classItEnum.first; classIt != classItEnum.second; ++classIt)
+        {
+          if (classIt->second.IsMatchFilterElementHide(pEl))
+          {
+#ifdef ENABLE_DEBUG_RESULT
+            DEBUG_HIDE_EL(indent + "HideEl::Found (tag/class) filter:" + classIt->second.m_filterText)
+              CPluginDebug::DebugResultHiding(tagCString, L"class:" + className, classIt->second.m_filterText);
+#endif
+            return true;
+          }
+        }
+
+        // Search general class name
+        classItEnum = m_elementHideTagsClass.equal_range(std::make_pair("", className));
+        for (TFilterElementHideTagsNamed::const_iterator classIt = classItEnum.first; classIt != classItEnum.second; ++ classIt)
+        {
+          if (classIt->second.IsMatchFilterElementHide(pEl))
+          {
+#ifdef ENABLE_DEBUG_RESULT
+            DEBUG_HIDE_EL(indent + "HideEl::Found (?/class) filter:" + classIt->second.m_filterText)
+              CPluginDebug::DebugResultHiding(tagCString, "class:" + className, classIt->second.m_filterText);
+#endif
+            return true;
+          }
+        }
+
+        // Next class name
+        className = classNames.Tokenize(L" \t\n\r", pos);
+      }
+    }
+
+    // Search tag filters
+    std::pair<TFilterElementHideTags::const_iterator, TFilterElementHideTags::const_iterator> tagItEnum 
+      = m_elementHideTags.equal_range(tagCString);
+    for (TFilterElementHideTags::const_iterator tagIt = tagItEnum.first; tagIt != tagItEnum.second; ++ tagIt)
+    {
+      if (tagIt->second.IsMatchFilterElementHide(pEl))
+      {
+#ifdef ENABLE_DEBUG_RESULT
+        DEBUG_HIDE_EL(indent + "HideEl::Found (tag) filter:" + tagIt->second.m_filterText)
+          CPluginDebug::DebugResultHiding(tagCString, "-", tagIt->second.m_filterText);
+#endif
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+bool CPluginFilter::LoadHideFilters(std::vector<std::wstring> filters)
+{
+  ClearFilters();
+  bool isRead = false;
+  CPluginClient* client = CPluginClient::GetInstance();
+
+  // Parse hide string
+  int pos = 0;
+  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
+  {
+    for (std::vector<std::wstring>::iterator it = filters.begin(); it < filters.end(); ++it)
+    {
+      CString filter((*it).c_str());
+      // If the line is not commented out
+      if (!filter.Trim().IsEmpty() && filter.GetAt(0) != '!' && filter.GetAt(0) != '[')
+      {
+        int filterType = 0;
+
+        // See http://adblockplus.org/en/filters for further documentation
+
+        try
+        {
+          AddFilterElementHide(filter);
+        }
+        catch(...)
+        {
+#ifdef ENABLE_DEBUG_RESULT
+          CPluginDebug::DebugResult(L"Error loading hide filter: " + filter);
+#endif
+        }
+      }
+    }
+  }
+
+  return isRead;
+}
+
+void CPluginFilter::ClearFilters()
+{
+  // Clear filter maps
+  CriticalSection::Lock filterEngineLock(s_criticalSectionFilterMap);
+  {
+    for (int i = 0; i < 2; i++)
+    {
+      for (int j = 0; j < 2; j++)
+      {
+        m_filterMap[i][j].clear();
+      }
+      m_filterMapDefault[i].clear();
+    }
+
+    m_elementHideTags.clear();
+    m_elementHideTagsId.clear();
+    m_elementHideTagsClass.clear();
+  }
+}
+
+bool CPluginFilter::ShouldBlock(const std::wstring& src, AdblockPlus::FilterEngine::ContentType contentType, const std::wstring& domain, bool addDebug) const
+{
+  std::wstring srcTrimmed = TrimString(src);
+
+  // We should not block the empty string, so all filtering does not make sense
+  // Therefore we just return
+  if (srcTrimmed.empty())
+  {
+    return false;
+  }
+
+  CPluginSettings* settings = CPluginSettings::GetInstance();
+
+  CPluginClient* client = CPluginClient::GetInstance();
+  bool result = client->Matches(srcTrimmed, contentType, domain);
+
+#ifdef ENABLE_DEBUG_RESULT
+  if (addDebug)
+  {
+    std::wstring type = ToUtf16String(ContentTypeToString(contentType));
+    if (result)
+    {
+      CPluginDebug::DebugResultBlocking(ToCString(type), srcTrimmed, domain);
+    }
+    else
+    {
+      CPluginDebug::DebugResultIgnoring(ToCString(type), srcTrimmed, domain);
+    }
+  }
+#endif
+  return result;
+}