Issue 5146 - Implement DownloadableSubscription parsing in C++

compiled/filter/CommentFilter.cpp

 /*
  * 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/>.
  */
 
 #include "CommentFilter.h"
 
 CommentFilter::CommentFilter(const String& text)
     : Filter(classType, text)
 {
+  if (text[0] == u'!') // this is unlikely to be false at that point
+  {
+    bool foundColon = false;

[hub, 2017/11/13 22:35:27]

this is currently untested. And I'm not sure it belongs here.

+    String::size_type beginParam = 0;
+    String::size_type endParam = 0;
+    String::size_type beginValue = 0;
+    for (String::size_type i = 1; i < mText.length(); i++)
+    {
+      switch (mText[i])
+      {
+      case ' ':
+      case '\t':
+        if (beginParam > 0 && !foundColon)
+        {
+          endParam = i - 1;
+        }
+        break;
+      case ':':
+        foundColon = true;
+        break;
+      default:
+        if (foundColon)
+        {
+          beginValue = i;
+        }
+        else
+        {
+          if (beginParam == 0)
+            beginParam = i;
+        }
+        break;
+      }
+      if (beginValue > 0)
+        break;
+    }
+    if (beginValue > 0)
+    {
+      mParam = DependentString(mText, beginParam, endParam - beginParam);
+      mParam.toLower();
+      mValue = DependentString(mText, beginValue,
+        mText.length() - 1 - beginValue);
+    }
+  }
 }
 
 Filter::Type CommentFilter::Parse(const String& text)
 {
   if (text.length() && text[0] == u'!')
     return Type::COMMENT;
   else
     return Type::UNKNOWN;
 }
 
 CommentFilter* CommentFilter::Create(const String& text)
 {
   Type type = Parse(text);
   if (type == Type::COMMENT)
     return new CommentFilter(text);
   else
     return nullptr;
 }