Issue 5142 - Convert Element Hiding to C++

compiled/ElemHide.h

Index: compiled/ElemHide.h
===================================================================
new file mode 100644
--- /dev/null
+++ b/compiled/ElemHide.h
@@ -0,0 +1,103 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus 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 Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @fileOverview Element hiding implementation.
+ */
+
+#pragma once
+
+#include <unordered_map>
+#include <vector>
+
+#include "bindings/runtime.h"
+#include "intrusive_ptr.h"
+#include "StringMap.h"
+#include "filter/Filter.h"
+#include "filter/ElemHideBase.h"
+#include "filter/ElemHideException.h"
+
+class ElemHide_SelectorList : public ref_counted
+{
+  std::vector<ElemHideBasePtr> mSelectors;
+public:
+  size_t BINDINGS_EXPORTED GetSelectorCount() const
+  {
+    return mSelectors.size();
+  }
+  OwnedString BINDINGS_EXPORTED SelectorAt(size_t idx) const;
+  const String& BINDINGS_EXPORTED FilterKeyAt(size_t idx) const;
+
+  void push_back(const ElemHideBasePtr& filter)
+  {
+    mSelectors.push_back(filter);
+  }
+
+  void append(const ElemHide_SelectorList* list)

[sergei, 2018/01/15 15:31:18]

should it be a reference instead of a pointer?

[hub, 2018/01/16 02:57:39]

Done.

+  {
+    mSelectors.insert(mSelectors.end(),
+                      list->mSelectors.cbegin(), list->mSelectors.cend());
+  }
+};
+
+class ElemHide : public ref_counted
+{
+  // All filters. Key is filter text. Exception filters excluded.
+  StringMap<ElemHideBasePtr> mFilters;
+  // StringMap is non copyable. std::unordered_map<> it is
+  // Filters by domain. Key is domain. Subkey is filter text.
+  StringMap<std::unordered_map<DependentString,ElemHideBasePtr,StringHash>> mFiltersByDomain;
+
+  // Exceptions. The key is the selector.
+  OwnedStringMap<std::vector<ElemHideExceptionPtr>> mExceptions;
+  // Known exceptions. Filter text as keys.
+  StringSet mKnownExceptions;
+
+  // Unconditional selectors. Filter text as key
+  StringSet mUnconditionalSelectors;
+
+  mutable intrusive_ptr<ElemHide_SelectorList> mUnconditionalSelectorsCache;
+
+  static ElemHide* mInstance;
+public:
+  enum Criteria
+  {
+    ALL_MATCHING = 0,

[sergei, 2018/01/15 15:31:18]

Could you please bring the comments from js file here, because it will be very
difficult to understand later the idea and aim of some parts?

[hub, 2018/01/16 02:57:39]

Done.

+    NO_UNCONDITIONAL = 1,
+    SPECIFIC_ONLY = 2,
+  };
+
+  static ElemHide* BINDINGS_EXPORTED GetInstance()
+  {
+    return mInstance;
+  }
+
+  void BINDINGS_EXPORTED Clear();
+  void BINDINGS_EXPORTED Add(ElemHideBase& filter);
+  void BINDINGS_EXPORTED Remove(ElemHideBase& filter);
+
+  ElemHide_SelectorList* BINDINGS_EXPORTED GetSelectorsForDomain(const String& domain,
+                                                                 Criteria criteria) const;
+  ElemHide_SelectorList* BINDINGS_EXPORTED GetUnconditionalSelectors() const;
+
+  ElemHideException* BINDINGS_EXPORTED GetException(const ElemHideBase& filter,
+                                                    DependentString& docDomain) const;
+
+private:
+  void AddToFiltersByDomain(ElemHideBase& filter);
+};
+