| // 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 keyword autocomplete provider. The keyword provider |
| // is responsible for remembering/suggesting user "search keyword queries" |
| // (e.g. "imdb Godzilla") and then fixing them up into valid URLs. An |
| // instance of it gets created and managed by the autocomplete controller. |
| // KeywordProvider uses a TemplateURLModel to find the set of keywords. |
| // |
| // For more information on the autocomplete system in general, including how |
| // the autocomplete controller and autocomplete providers work, see |
| // chrome/browser/autocomplete.h. |
| |
| #ifndef CHROME_BROWSER_AUTOCOMPLETE_KEYWORD_PROVIDER_H_ |
| #define CHROME_BROWSER_AUTOCOMPLETE_KEYWORD_PROVIDER_H_ |
| #pragma once |
| |
| #include <string> |
| |
| #include "chrome/browser/autocomplete/autocomplete.h" |
| #include "content/common/notification_observer.h" |
| #include "content/common/notification_registrar.h" |
| |
| class Profile; |
| class TemplateURL; |
| class TemplateURLModel; |
| |
| // Autocomplete provider for keyword input. |
| // |
| // After construction, the autocomplete controller repeatedly calls Start() |
| // with some user input, each time expecting to receive a small set of the best |
| // matches (either synchronously or asynchronously). |
| // |
| // To construct these matches, the provider treats user input as a series of |
| // whitespace-delimited tokens and tries to match the first token as the prefix |
| // of a known "keyword". A keyword is some string that maps to a search query |
| // URL; the rest of the user's input is taken as the input to the query. For |
| // example, the keyword "bug" might map to the URL "http://b/issue?id=%s", so |
| // input like "bug 123" would become "http://b/issue?id=123". |
| // |
| // Because we do prefix matching, user input could match more than one keyword |
| // at once. (Example: the input "f jazz" matches all keywords starting with |
| // "f".) We return the best matches, up to three. |
| // |
| // The resulting matches are shown with content specified by the keyword |
| // (usually "Search [name] for %s"), description "(Keyword: [keyword])", and |
| // action "[keyword] %s". If the user has typed a (possibly partial) keyword |
| // but no search terms, the suggested result is shown greyed out, with |
| // "<enter term(s)>" as the substituted input, and does nothing when selected. |
| class KeywordProvider : public AutocompleteProvider, |
| public NotificationObserver { |
| public: |
| KeywordProvider(ACProviderListener* listener, Profile* profile); |
| // For testing. |
| KeywordProvider(ACProviderListener* listener, TemplateURLModel* model); |
| |
| // Returns the replacement string from the user input. The replacement |
| // string is the portion of the input that does not contain the keyword. |
| // For example, the replacement string for "b blah" is blah. |
| // If |trim_leading_whitespace| is true then leading whitespace in |
| // replacement string will be trimmed. |
| static string16 SplitReplacementStringFromInput( |
| const string16& input, |
| bool trim_leading_whitespace); |
| |
| // Returns the matching substituting keyword for |input|, or NULL if there |
| // is no keyword for the specified input. |
| static const TemplateURL* GetSubstitutingTemplateURLForInput( |
| Profile* profile, |
| const AutocompleteInput& input, |
| string16* remaining_input); |
| |
| // AutocompleteProvider |
| virtual void Start(const AutocompleteInput& input, bool minimal_changes); |
| virtual void Stop(); |
| |
| private: |
| class ScopedEndExtensionKeywordMode; |
| friend class ScopedEndExtensionKeywordMode; |
| |
| virtual ~KeywordProvider(); |
| |
| // Extracts the keyword from |input| into |keyword|. Any remaining characters |
| // after the keyword are placed in |remaining_input|. Returns true if |input| |
| // is valid and has a keyword. This makes use of SplitKeywordFromInput to |
| // extract the keyword and remaining string, and uses |
| // TemplateURLModel::CleanUserInputKeyword to remove unnecessary characters. |
| // In general use this instead of SplitKeywordFromInput. |
| // Leading whitespace in |*remaining_input| will be trimmed. |
| static bool ExtractKeywordFromInput(const AutocompleteInput& input, |
| string16* keyword, |
| string16* remaining_input); |
| |
| // Extracts the next whitespace-delimited token from input and returns it. |
| // Sets |remaining_input| to everything after the first token (skipping over |
| // the first intervening whitespace). |
| // If |trim_leading_whitespace| is true then leading whitespace in |
| // |*remaining_input| will be trimmed. |
| static string16 SplitKeywordFromInput(const string16& input, |
| bool trim_leading_whitespace, |
| string16* remaining_input); |
| |
| // Fills in the "destination_url" and "contents" fields of |match| with the |
| // provided user input and keyword data. |
| static void FillInURLAndContents( |
| const string16& remaining_input, |
| const TemplateURL* element, |
| AutocompleteMatch* match); |
| |
| // Determines the relevance for some input, given its type, whether the user |
| // typed the complete keyword, and whether the user is in "prefer keyword |
| // matches" mode, and whether the keyword supports replacement. |
| // If |allow_exact_keyword_match| is false, the relevance for complete |
| // keywords that support replacements is degraded. |
| static int CalculateRelevance(AutocompleteInput::Type type, |
| bool complete, |
| bool support_replacement, |
| bool prefer_keyword, |
| bool allow_exact_keyword_match); |
| |
| // Creates a fully marked-up AutocompleteMatch from the user's input. |
| // If |relevance| is negative, calculate a relevance based on heuristics. |
| AutocompleteMatch CreateAutocompleteMatch( |
| TemplateURLModel* model, |
| const string16& keyword, |
| const AutocompleteInput& input, |
| size_t prefix_length, |
| const string16& remaining_input, |
| int relevance); |
| |
| void EnterExtensionKeywordMode(const std::string& extension_id); |
| void MaybeEndExtensionKeywordMode(); |
| |
| // NotificationObserver interface. |
| virtual void Observe(NotificationType type, |
| const NotificationSource& source, |
| const NotificationDetails& details); |
| |
| // Model for the keywords. This is only non-null when testing, otherwise the |
| // TemplateURLModel from the Profile is used. |
| TemplateURLModel* model_; |
| |
| // Identifies the current input state. This is incremented each time the |
| // autocomplete edit's input changes in any way. It is used to tell whether |
| // suggest results from the extension are current. |
| int current_input_id_; |
| |
| // The input state at the time we last asked the extension for suggest |
| // results. |
| AutocompleteInput extension_suggest_last_input_; |
| |
| // We remember the last suggestions we've received from the extension in case |
| // we need to reset our matches without asking the extension again. |
| std::vector<AutocompleteMatch> extension_suggest_matches_; |
| |
| // If non-empty, holds the ID of the extension whose keyword is currently in |
| // the URL bar while the autocomplete popup is open. |
| std::string current_keyword_extension_id_; |
| |
| NotificationRegistrar registrar_; |
| |
| DISALLOW_COPY_AND_ASSIGN(KeywordProvider); |
| }; |
| |
| #endif // CHROME_BROWSER_AUTOCOMPLETE_KEYWORD_PROVIDER_H_ |