Don't autocomplete searches of >1 word if they've only been visited once and the user has not yet...

chrome/browser/autocomplete/search_provider.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all non-keyword autocomplete entries that start with
 // "Search <engine> for ...", including searching for the current input string,
 // search history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 //
@@ skipping 153 matching lines @@
     GURL url;
 
     // Name for the site.
     string16 site_name;
   };
 
   typedef std::vector<string16> SuggestResults;
   typedef std::vector<NavigationResult> NavigationResults;
   typedef std::vector<history::KeywordSearchTermVisit> HistoryResults;
   typedef std::map<string16, AutocompleteMatch> MatchMap;
+  typedef std::pair<string16, int> ScoredTerm;
+  typedef std::vector<ScoredTerm> ScoredTerms;
+
+  class CompareScoredTerms;
 
   // Called when timer_ expires.
   void Run();
 
   // Runs the history query, if necessary. The history query is synchronous.
   // This does not update |done_|.
   void DoHistoryQuery(bool minimal_changes);
 
   // Determines whether an asynchronous subcomponent query should run for the
   // current input.  If so, starts it if necessary; otherwise stops it.
@@ skipping 33 matching lines @@
     const NavigationResults& navigation_results,
     bool is_keyword);
 
   // Adds a match for each result in |results| to |map|. |is_keyword| indicates
   // whether the results correspond to the keyword provider or default provider.
   void AddHistoryResultsToMap(const HistoryResults& results,
                               bool is_keyword,
                               int did_not_accept_suggestion,
                               MatchMap* map);
 
+  // Calculates relevance scores for all |results|.
+  ScoredTerms ScoreHistoryTerms(const HistoryResults& results,
+                                bool base_prevent_inline_autocomplete,
+                                bool input_multiple_words,
+                                const string16& input_text,
+                                bool is_keyword);
+
   // Adds a match for each result in |suggest_results| to |map|. |is_keyword|
   // indicates whether the results correspond to the keyword provider or default
   // provider.
   void AddSuggestResultsToMap(const SuggestResults& suggest_results,
                               bool is_keyword,
                               int did_not_accept_suggestion,
                               MatchMap* map);
 
   // Determines the relevance for a particular match.  We use different scoring
   // algorithms for the different types of matches.
   int CalculateRelevanceForWhatYouTyped() const;
-  // |time| is the time at which this query was last seen. |is_keyword| is true
-  // if the search is from the keyword provider. |looks_like_url| is true if the
-  // search term would be treated as a URL if typed into the omnibox.
+  // |time| is the time at which this query was last seen.  |is_keyword|
+  // indicates whether the results correspond to the keyword provider or default
+  // provider. |prevent_inline_autocomplete| is true if we should not inline
+  // autocomplete this query.
   int CalculateRelevanceForHistory(const base::Time& time,
-                                   bool looks_like_url,
-                                   bool is_keyword) const;
+                                   bool is_keyword,
+                                   bool prevent_inline_autocomplete) const;
   // |result_number| is the index of the suggestion in the result set from the
   // server; the best suggestion is suggestion number 0.  |is_keyword| is true
   // if the search is from the keyword provider.
   int CalculateRelevanceForSuggestion(size_t num_results,
                                       size_t result_number,
                                       bool is_keyword) const;
   // |result_number| is same as above. |is_keyword| is true if the navigation
   // result was suggested by the keyword provider.
   int CalculateRelevanceForNavigation(size_t num_results,
                                       size_t result_number,
@@ skipping 65 matching lines @@
   // Has FinalizeInstantQuery been invoked since the last |Start|?
   bool instant_finalized_;
 
   // The |suggest_text| parameter passed to FinalizeInstantQuery.
   string16 default_provider_suggest_text_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_