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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/builtin_provider.h"
      6 
      7 #include <algorithm>
      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/common/net/url_fixer_upper.h"
     13 #include "chrome/common/url_constants.h"
     14 
     15 namespace {
     16 
     17 // This list should be kept in sync with chrome/common/url_constants.h.
     18 // Only include useful sub-pages, confirmation alerts are not useful.
     19 const char* const kChromeSettingsSubPages[] = {
     20   chrome::kAutofillSubPage,
     21   chrome::kClearBrowserDataSubPage,
     22   chrome::kContentSettingsSubPage,
     23   chrome::kContentSettingsExceptionsSubPage,
     24   chrome::kImportDataSubPage,
     25   chrome::kLanguageOptionsSubPage,
     26   chrome::kPasswordManagerSubPage,
     27   chrome::kSearchEnginesSubPage,
     28   chrome::kSyncSetupSubPage,
     29 #if defined(OS_CHROMEOS)
     30   chrome::kInternetOptionsSubPage,
     31 #endif
     32 };
     33 
     34 }  // namespace
     35 
     36 const int BuiltinProvider::kRelevance = 860;
     37 
     38 BuiltinProvider::BuiltinProvider(AutocompleteProviderListener* listener,
     39                                  Profile* profile)
     40     : AutocompleteProvider(listener, profile,
     41           AutocompleteProvider::TYPE_BUILTIN) {
     42   std::vector<std::string> builtins(
     43       chrome::kChromeHostURLs,
     44       chrome::kChromeHostURLs + chrome::kNumberOfChromeHostURLs);
     45   std::sort(builtins.begin(), builtins.end());
     46   for (std::vector<std::string>::iterator i(builtins.begin());
     47        i != builtins.end(); ++i)
     48     builtins_.push_back(ASCIIToUTF16(*i));
     49   string16 settings(ASCIIToUTF16(chrome::kChromeUISettingsHost) +
     50                     ASCIIToUTF16("/"));
     51   for (size_t i = 0; i < arraysize(kChromeSettingsSubPages); i++)
     52     builtins_.push_back(settings + ASCIIToUTF16(kChromeSettingsSubPages[i]));
     53 }
     54 
     55 void BuiltinProvider::Start(const AutocompleteInput& input,
     56                             bool minimal_changes) {
     57   matches_.clear();
     58   if ((input.type() == AutocompleteInput::INVALID) ||
     59       (input.type() == AutocompleteInput::FORCED_QUERY) ||
     60       (input.type() == AutocompleteInput::QUERY) ||
     61       (input.matches_requested() == AutocompleteInput::BEST_MATCH))
     62     return;
     63 
     64   const string16 kAbout = ASCIIToUTF16(chrome::kAboutScheme) +
     65       ASCIIToUTF16(content::kStandardSchemeSeparator);
     66   const string16 kChrome = ASCIIToUTF16(chrome::kChromeUIScheme) +
     67       ASCIIToUTF16(content::kStandardSchemeSeparator);
     68 
     69   const int kUrl = ACMatchClassification::URL;
     70   const int kMatch = kUrl | ACMatchClassification::MATCH;
     71 
     72   string16 text = input.text();
     73   bool starting_chrome = StartsWith(kChrome, text, false);
     74   if (starting_chrome || StartsWith(kAbout, text, false)) {
     75     ACMatchClassifications styles;
     76     // Highlight the input portion matching "chrome://"; or if the user has
     77     // input "about:" (with optional slashes), highlight the whole "chrome://".
     78     const size_t kAboutSchemeLength = strlen(chrome::kAboutScheme);
     79     bool highlight = starting_chrome || text.length() > kAboutSchemeLength;
     80     styles.push_back(ACMatchClassification(0, highlight ? kMatch : kUrl));
     81     size_t offset = starting_chrome ? text.length() : kChrome.length();
     82     if (highlight)
     83       styles.push_back(ACMatchClassification(offset, kUrl));
     84     // Include some common builtin chrome URLs as the user types the scheme.
     85     AddMatch(ASCIIToUTF16(chrome::kChromeUIChromeURLsURL), styles);
     86     AddMatch(ASCIIToUTF16(chrome::kChromeUISettingsURL), styles);
     87     AddMatch(ASCIIToUTF16(chrome::kChromeUIVersionURL), styles);
     88   } else {
     89     // Match input about: or chrome: URL input against builtin chrome URLs.
     90     GURL url = URLFixerUpper::FixupURL(UTF16ToUTF8(text), std::string());
     91     if (url.SchemeIs(chrome::kChromeUIScheme) && url.has_host()) {
     92       // Include the path for sub-pages (e.g. "chrome://settings/browser").
     93       string16 host_and_path = UTF8ToUTF16(url.host() + url.path());
     94       TrimString(host_and_path, ASCIIToUTF16("/").c_str(), &host_and_path);
     95       size_t match_length = kChrome.length() + host_and_path.length();
     96       for (Builtins::const_iterator i(builtins_.begin());
     97           (i != builtins_.end()) && (matches_.size() < kMaxMatches); ++i) {
     98         if (StartsWith(*i, host_and_path, false)) {
     99           ACMatchClassifications styles;
    100           // Highlight the "chrome://" scheme, even for input "about:foo".
    101           styles.push_back(ACMatchClassification(0, kMatch));
    102           string16 match_string = kChrome + *i;
    103           if (match_string.length() > match_length)
    104             styles.push_back(ACMatchClassification(match_length, kUrl));
    105           AddMatch(match_string, styles);
    106         }
    107       }
    108     }
    109   }
    110 
    111   for (size_t i = 0; i < matches_.size(); ++i)
    112     matches_[i].relevance = kRelevance + matches_.size() - (i + 1);
    113 }
    114 
    115 BuiltinProvider::~BuiltinProvider() {}
    116 
    117 void BuiltinProvider::AddMatch(const string16& match_string,
    118                                const ACMatchClassifications& styles) {
    119   AutocompleteMatch match(this, kRelevance, false,
    120                           AutocompleteMatchType::NAVSUGGEST);
    121   match.fill_into_edit = match_string;
    122   match.destination_url = GURL(match_string);
    123   match.contents = match_string;
    124   match.contents_class = styles;
    125   matches_.push_back(match);
    126 }
    127