components/omnibox/url_prefix.cc

   1 // Copyright 2014 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 "components/omnibox/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
  11 namespace {
  12
  13 // Like URLPrefix::BestURLPrefix() except also handles the prefix of
  14 // "www.".
  15 const URLPrefix* BestURLPrefixWithWWWCase(
  16     const base::string16& text,
  17     const base::string16& prefix_suffix) {
  18   CR_DEFINE_STATIC_LOCAL(URLPrefix, www_prefix,
  19                          (base::ASCIIToUTF16("www."), 1));
  20   const URLPrefix* best_prefix = URLPrefix::BestURLPrefix(text, prefix_suffix);
  21   if ((best_prefix == NULL) ||
  22       (best_prefix->num_components < www_prefix.num_components)) {
  23     if (URLPrefix::PrefixMatch(www_prefix, text, prefix_suffix))
  24       best_prefix = &www_prefix;
  25   }
  26   return best_prefix;
  27 }
  28
  29 }  // namespace
  30
  31 URLPrefix::URLPrefix(const base::string16& prefix, size_t num_components)
  32     : prefix(prefix),
  33       num_components(num_components) {
  34 }
  35
  36 // static
  37 const URLPrefixes& URLPrefix::GetURLPrefixes() {
  38   CR_DEFINE_STATIC_LOCAL(URLPrefixes, prefixes, ());
  39   if (prefixes.empty()) {
  40     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://www."), 2));
  41     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://www."), 2));
  42     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://www."), 2));
  43     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://"), 1));
  44     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://"), 1));
  45     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://"), 1));
  46     prefixes.push_back(URLPrefix(base::string16(), 0));
  47   }
  48   return prefixes;
  49 }
  50
  51 // static
  52 bool URLPrefix::IsURLPrefix(const base::string16& prefix) {
  53   const URLPrefixes& list = GetURLPrefixes();
  54   for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
  55     if (i->prefix == prefix)
  56       return true;
  57   return false;
  58 }
  59
  60 // static
  61 const URLPrefix* URLPrefix::BestURLPrefix(const base::string16& text,
  62                                           const base::string16& prefix_suffix) {
  63   const URLPrefixes& list = GetURLPrefixes();
  64   for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
  65     if (PrefixMatch(*i, text, prefix_suffix))
  66       return &(*i);
  67   return NULL;
  68 }
  69
  70 // static
  71 bool URLPrefix::PrefixMatch(const URLPrefix& prefix,
  72                             const base::string16& text,
  73                             const base::string16& prefix_suffix) {
  74   return StartsWith(text, prefix.prefix + prefix_suffix, false);
  75 }
  76
  77 // static
  78 size_t URLPrefix::GetInlineAutocompleteOffset(
  79     const base::string16& input,
  80     const base::string16& fixed_up_input,
  81     const bool allow_www_prefix_without_scheme,
  82     const base::string16& text) {
  83   const URLPrefix* best_prefix = allow_www_prefix_without_scheme ?
  84       BestURLPrefixWithWWWCase(text, input) : BestURLPrefix(text, input);
  85   const base::string16* matching_string = &input;
  86   // If we failed to find a best_prefix initially, try again using a fixed-up
  87   // version of the user input.  This is especially useful to get about: URLs
  88   // to inline against chrome:// shortcuts.  (about: URLs are fixed up to the
  89   // chrome:// scheme.)
  90   if (!best_prefix && !fixed_up_input.empty() && (fixed_up_input != input)) {
  91     best_prefix = allow_www_prefix_without_scheme ?
  92         BestURLPrefixWithWWWCase(text, fixed_up_input) :
  93         BestURLPrefix(text, fixed_up_input);
  94     matching_string = &fixed_up_input;
  95   }
  96   return (best_prefix != NULL) ?
  97       (best_prefix->prefix.length() + matching_string->length()) :
  98       base::string16::npos;
  99 }