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// 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.
#ifndef CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
#define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
#pragma once
#include <string>
#include "chrome/browser/autocomplete/autocomplete_match.h"
#include "chrome/browser/autocomplete/history_provider.h"
#include "chrome/browser/history/history_types.h"
#include "chrome/browser/history/in_memory_url_index.h"
class Profile;
class TermMatches;
namespace history {
class HistoryBackend;
} // namespace history
// This class is an autocomplete provider (a pseudo-internal component of
// the history system) which quickly (and synchronously) provides matching
// results from recently or frequently visited sites in the profile's
// history.
class HistoryQuickProvider : public HistoryProvider {
public:
HistoryQuickProvider(ACProviderListener* listener, Profile* profile);
virtual ~HistoryQuickProvider();
// AutocompleteProvider. |minimal_changes| is ignored since there
// is no asynch completion performed.
virtual void Start(const AutocompleteInput& input,
bool minimal_changes) OVERRIDE;
virtual void DeleteMatch(const AutocompleteMatch& match) OVERRIDE;
// Performs the autocomplete matching and scoring.
void DoAutocomplete();
private:
friend class HistoryQuickProviderTest;
FRIEND_TEST_ALL_PREFIXES(HistoryQuickProviderTest, Spans);
FRIEND_TEST_ALL_PREFIXES(HistoryQuickProviderTest, Relevance);
// Creates an AutocompleteMatch from |history_match|. |max_match_score| gives
// the maximum possible score for the match.
AutocompleteMatch QuickMatchToACMatch(
const history::ScoredHistoryMatch& history_match,
bool prevent_inline_autocomplete,
int* max_match_score);
// Determines the relevance score of |history_match|. The maximum allowed
// score for the match is passed in |max_match_score|. The |max_match_score|
// is always set to the resulting score minus 1 whenever the match's score
// has to be limited or is <= to |max_match_score|. This function should be
// called in a loop with each match in decreasing order of raw score.
static int CalculateRelevance(
const history::ScoredHistoryMatch& history_match,
int* max_match_score);
// Returns the index that should be used for history lookups.
history::InMemoryURLIndex* GetIndex();
// Fill and return an ACMatchClassifications structure given the term
// matches (|matches|) to highlight where terms were found.
static ACMatchClassifications SpansFromTermMatch(
const history::TermMatches& matches,
size_t text_length,
bool is_url);
// Only for use in unittests. Takes ownership of |index|.
void SetIndexForTesting(history::InMemoryURLIndex* index);
AutocompleteInput autocomplete_input_;
std::string languages_;
// Only used for testing.
scoped_ptr<history::InMemoryURLIndex> index_for_testing_;
};
#endif // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
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