Issue 116 - Document the libadblockplus API

include/AdblockPlus/ReferrerMapping.h

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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
@@ skipping 10 matching lines @@
 #include <list>
 #include <map>
 #include <string>
 #include <vector>
 
 namespace AdblockPlus
 {
   /**
    * Stores a mapping between URLs and their referrers.
    * This can be used to build a chain of referrers for any URL
-   * (see `BuildReferrerChain()`), which approximates the frame structure.
+   * (see `BuildReferrerChain()`), which approximates the frame structure, see
+   * FilterEngine::Matches().
    */
   class ReferrerMapping
   {
   public:
     /**
      * Constructor.
      * @param maxCachedUrls Number of URL mappings to store. The higher the
      *        better - clients typically cache requests, and a single cached
      *        request will break the referrer chain.
      */
     ReferrerMapping(const int maxCachedUrls = 5000);
 
     /**
-     * Adds a new mapping from URL to referrer.
+     * Records the refferer for a URL.
      * @param url Request URL.
      * @param referrer Request referrer.
      */
     void Add(const std::string& url, const std::string& referrer);
 
     /**
-     * Builds the referrer chain for the supplied URL.
+     * Builds a chain of referrers for the supplied URL.
+     * This should reconstruct a document's parent frame URLs.
      * @param url URL to build the chain for.
      * @return List of URLs, starting with `url`.
      */
     std::vector<std::string> BuildReferrerChain(const std::string& url) const;
 
   private:
     const int maxCachedUrls;
     std::map<std::string, std::string> mapping;
     std::list<std::string> cachedUrls;
   };
 }
 
 #endif