chrome/browser/autocomplete/url_prefix.cc

   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/url_prefix.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/strings/string_util.h"
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "chrome/browser/autocomplete/autocomplete_input.h"
  11
  12 namespace {
  13
  14 // Like URLPrefix::BestURLPrefix() except also handles the prefix of
  15 // "www.".
  16 const URLPrefix* BestURLPrefixWithWWWCase(
  17     const base::string16& text,
  18     const base::string16& prefix_suffix) {
  19   CR_DEFINE_STATIC_LOCAL(URLPrefix, www_prefix,
  20                          (base::ASCIIToUTF16("www."), 1));
  21   const URLPrefix* best_prefix = URLPrefix::BestURLPrefix(text, prefix_suffix);
  22   if ((best_prefix == NULL) ||
  23       (best_prefix->num_components < www_prefix.num_components)) {
  24     if (URLPrefix::PrefixMatch(www_prefix, text, prefix_suffix))
  25       best_prefix = &www_prefix;
  26   }
  27   return best_prefix;
  28 }
  29
  30 }  // namespace
  31
  32 URLPrefix::URLPrefix(const base::string16& prefix, size_t num_components)
  33     : prefix(prefix),
  34       num_components(num_components) {
  35 }
  36
  37 // static
  38 const URLPrefixes& URLPrefix::GetURLPrefixes() {
  39   CR_DEFINE_STATIC_LOCAL(URLPrefixes, prefixes, ());
  40   if (prefixes.empty()) {
  41     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://www."), 2));
  42     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://www."), 2));
  43     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://ftp."), 2));
  44     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://www."), 2));
  45     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://"), 1));
  46     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://"), 1));
  47     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://"), 1));
  48     prefixes.push_back(URLPrefix(base::string16(), 0));
  49   }
  50   return prefixes;
  51 }
  52
  53 // static
  54 bool URLPrefix::IsURLPrefix(const base::string16& prefix) {
  55   const URLPrefixes& list = GetURLPrefixes();
  56   for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
  57     if (i->prefix == prefix)
  58       return true;
  59   return false;
  60 }
  61
  62 // static
  63 const URLPrefix* URLPrefix::BestURLPrefix(const base::string16& text,
  64                                           const base::string16& prefix_suffix) {
  65   const URLPrefixes& list = GetURLPrefixes();
  66   for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
  67     if (PrefixMatch(*i, text, prefix_suffix))
  68       return &(*i);
  69   return NULL;
  70 }
  71
  72 // static
  73 bool URLPrefix::PrefixMatch(const URLPrefix& prefix,
  74                             const base::string16& text,
  75                             const base::string16& prefix_suffix) {
  76   return StartsWith(text, prefix.prefix + prefix_suffix, false);
  77 }
  78
  79 // static
  80 size_t URLPrefix::GetInlineAutocompleteOffset(
  81     const AutocompleteInput& input,
  82     const AutocompleteInput& fixed_up_input,
  83     const bool allow_www_prefix_without_scheme,
  84     const base::string16& text) {
  85   const URLPrefix* best_prefix = allow_www_prefix_without_scheme ?
  86       BestURLPrefixWithWWWCase(text, input.text()) :
  87       BestURLPrefix(text, input.text());
  88   const base::string16* matching_string = &input.text();
  89   // If we failed to find a best_prefix initially, try again using a fixed-up
  90   // version of the user input.  This is especially useful to get about: URLs
  91   // to inline against chrome:// shortcuts.  (about: URLs are fixed up to the
  92   // chrome:// scheme.)
  93   if ((best_prefix == NULL) && !fixed_up_input.text().empty() &&
  94       (fixed_up_input.text() != input.text())) {
  95     best_prefix = allow_www_prefix_without_scheme ?
  96         BestURLPrefixWithWWWCase(text, fixed_up_input.text()) :
  97         BestURLPrefix(text, fixed_up_input.text());
  98     matching_string = &fixed_up_input.text();
  99   }
 100   return (best_prefix != NULL) ?
 101       (best_prefix->prefix.length() + matching_string->length()) :
 102       base::string16::npos;
 103 }