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// Copyright (c) 2012 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 zero-suggest autocomplete provider. This experimental
// provider is invoked when the user focuses in the omnibox prior to editing,
// and generates search query suggestions based on the current URL. To enable
// this provider, point --experimental-zero-suggest-url-prefix at an
// appropriate suggestion service.
//
// HUGE DISCLAIMER: This is just here for experimenting and will probably be
// deleted entirely as we revise how suggestions work with the omnibox.
#ifndef CHROME_BROWSER_AUTOCOMPLETE_ZERO_SUGGEST_PROVIDER_H_
#define CHROME_BROWSER_AUTOCOMPLETE_ZERO_SUGGEST_PROVIDER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/autocomplete/base_search_provider.h"
#include "chrome/browser/autocomplete/search_provider.h"
class TemplateURLService;
namespace base {
class ListValue;
class Value;
}
namespace net {
class URLFetcher;
}
// Autocomplete provider for searches based on the current URL.
//
// The controller will call StartZeroSuggest when the user focuses in the
// omnibox. After construction, the autocomplete controller repeatedly calls
// Start() with some user input, each time expecting to receive an updated
// set of matches.
//
// TODO(jered): Consider deleting this class and building this functionality
// into SearchProvider after dogfood and after we break the association between
// omnibox text and suggestions.
class ZeroSuggestProvider : public BaseSearchProvider {
public:
// Creates and returns an instance of this provider.
static ZeroSuggestProvider* Create(AutocompleteProviderListener* listener,
Profile* profile);
// AutocompleteProvider:
virtual void Start(const AutocompleteInput& input,
bool minimal_changes) OVERRIDE;
// Sets |field_trial_triggered_| to false.
virtual void ResetSession() OVERRIDE;
private:
ZeroSuggestProvider(AutocompleteProviderListener* listener,
Profile* profile);
virtual ~ZeroSuggestProvider();
// BaseSearchProvider:
virtual const TemplateURL* GetTemplateURL(bool is_keyword) const OVERRIDE;
virtual const AutocompleteInput GetInput(bool is_keyword) const OVERRIDE;
virtual Results* GetResultsToFill(bool is_keyword) OVERRIDE;
virtual bool ShouldAppendExtraParams(
const SuggestResult& result) const OVERRIDE;
virtual void StopSuggest() OVERRIDE;
virtual void ClearAllResults() OVERRIDE;
virtual int GetDefaultResultRelevance() const OVERRIDE;
virtual void RecordDeletionResult(bool success) OVERRIDE;
virtual void LogFetchComplete(bool success, bool is_keyword) OVERRIDE;
virtual bool IsKeywordFetcher(const net::URLFetcher* fetcher) const OVERRIDE;
virtual void UpdateMatches() OVERRIDE;
// Adds AutocompleteMatches for each of the suggestions in |results| to
// |map|.
void AddSuggestResultsToMap(const SuggestResults& results,
MatchMap* map);
// Returns an AutocompleteMatch for a navigational suggestion |navigation|.
AutocompleteMatch NavigationToMatch(const NavigationResult& navigation);
// Fetches zero-suggest suggestions by sending a request using |suggest_url|.
void Run(const GURL& suggest_url);
// Converts the parsed results to a set of AutocompleteMatches and adds them
// to |matches_|. Also update the histograms for how many results were
// received.
void ConvertResultsToAutocompleteMatches();
// Returns an AutocompleteMatch for the current URL. The match should be in
// the top position so that pressing enter has the effect of reloading the
// page.
AutocompleteMatch MatchForCurrentURL();
// When the user is in the Most Visited field trial, we ask the TopSites
// service for the most visited URLs during Run(). It calls back to this
// function to return those |urls|.
void OnMostVisitedUrlsAvailable(const history::MostVisitedURLList& urls);
// Returns the relevance score for the verbatim result.
int GetVerbatimRelevance() const;
// Whether we can show zero suggest on |current_page_url| without
// sending |current_page_url| as a parameter to the server at |suggest_url|.
bool CanShowZeroSuggestWithoutSendingURL(
const GURL& suggest_url,
const GURL& current_page_url) const;
// Used to build default search engine URLs for suggested queries.
TemplateURLService* template_url_service_;
// The URL for which a suggestion fetch is pending.
std::string current_query_;
// The type of page the user is viewing (a search results page doing search
// term replacement, an arbitrary URL, etc.).
AutocompleteInput::PageClassification current_page_classification_;
// Copy of OmniboxEditModel::permanent_text_.
base::string16 permanent_text_;
// Fetcher used to retrieve results.
scoped_ptr<net::URLFetcher> fetcher_;
// Suggestion for the current URL.
AutocompleteMatch current_url_match_;
// Contains suggest and navigation results as well as relevance parsed from
// the response for the most recent zero suggest input URL.
Results results_;
history::MostVisitedURLList most_visited_urls_;
// For callbacks that may be run after destruction.
base::WeakPtrFactory<ZeroSuggestProvider> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ZeroSuggestProvider);
};
#endif // CHROME_BROWSER_AUTOCOMPLETE_ZERO_SUGGEST_PROVIDER_H_
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