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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/autocomplete/history_provider.h"
      6 
      7 #include <string>
      8 
      9 #include "base/strings/string_util.h"
     10 #include "base/strings/utf_string_conversions.h"
     11 #include "chrome/browser/autocomplete/autocomplete_input.h"
     12 #include "chrome/browser/autocomplete/autocomplete_match.h"
     13 #include "chrome/browser/autocomplete/autocomplete_provider_listener.h"
     14 #include "chrome/browser/history/history_service.h"
     15 #include "chrome/browser/history/history_service_factory.h"
     16 #include "chrome/browser/history/in_memory_url_index_types.h"
     17 #include "chrome/browser/profiles/profile.h"
     18 #include "chrome/common/url_constants.h"
     19 #include "url/url_util.h"
     20 
     21 void HistoryProvider::DeleteMatch(const AutocompleteMatch& match) {
     22   DCHECK(done_);
     23   DCHECK(profile_);
     24   DCHECK(match.deletable);
     25 
     26   HistoryService* const history_service =
     27       HistoryServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
     28 
     29   // Delete the underlying URL along with all its visits from the history DB.
     30   // The resulting HISTORY_URLS_DELETED notification will also cause all caches
     31   // and indices to drop any data they might have stored pertaining to the URL.
     32   DCHECK(history_service);
     33   DCHECK(match.destination_url.is_valid());
     34   history_service->DeleteURL(match.destination_url);
     35 
     36   DeleteMatchFromMatches(match);
     37 }
     38 
     39 // static
     40 bool HistoryProvider::PreventInlineAutocomplete(
     41     const AutocompleteInput& input) {
     42   return input.prevent_inline_autocomplete() ||
     43       (!input.text().empty() &&
     44        IsWhitespace(input.text()[input.text().length() - 1]));
     45 }
     46 
     47 HistoryProvider::HistoryProvider(AutocompleteProviderListener* listener,
     48                                  Profile* profile,
     49                                  AutocompleteProvider::Type type)
     50     : AutocompleteProvider(listener, profile, type) {
     51 }
     52 
     53 HistoryProvider::~HistoryProvider() {}
     54 
     55 void HistoryProvider::DeleteMatchFromMatches(const AutocompleteMatch& match) {
     56   bool found = false;
     57   for (ACMatches::iterator i(matches_.begin()); i != matches_.end(); ++i) {
     58     if (i->destination_url == match.destination_url && i->type == match.type) {
     59       found = true;
     60       if (i->is_history_what_you_typed_match || i->starred) {
     61         // We can't get rid of What-You-Typed or Bookmarked matches,
     62         // but we can make them look like they have no backing data.
     63         i->deletable = false;
     64         i->description.clear();
     65         i->description_class.clear();
     66       } else {
     67         matches_.erase(i);
     68       }
     69       break;
     70     }
     71   }
     72   DCHECK(found) << "Asked to delete a URL that isn't in our set of matches";
     73 }
     74 
     75 // static
     76 ACMatchClassifications HistoryProvider::SpansFromTermMatch(
     77     const history::TermMatches& matches,
     78     size_t text_length,
     79     bool is_url) {
     80   ACMatchClassification::Style url_style =
     81       is_url ? ACMatchClassification::URL : ACMatchClassification::NONE;
     82   ACMatchClassifications spans;
     83   if (matches.empty()) {
     84     if (text_length)
     85       spans.push_back(ACMatchClassification(0, url_style));
     86     return spans;
     87   }
     88   if (matches[0].offset)
     89     spans.push_back(ACMatchClassification(0, url_style));
     90   size_t match_count = matches.size();
     91   for (size_t i = 0; i < match_count;) {
     92     size_t offset = matches[i].offset;
     93     spans.push_back(ACMatchClassification(offset,
     94         ACMatchClassification::MATCH | url_style));
     95     // Skip all adjacent matches.
     96     do {
     97       offset += matches[i].length;
     98       ++i;
     99     } while ((i < match_count) && (offset == matches[i].offset));
    100     if (offset < text_length)
    101       spans.push_back(ACMatchClassification(offset, url_style));
    102   }
    103 
    104   return spans;
    105 }
    106