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      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/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 
     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://ftp."), 2));
     43     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://www."), 2));
     44     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://"), 1));
     45     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://"), 1));
     46     prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://"), 1));
     47     prefixes.push_back(URLPrefix(base::string16(), 0));
     48   }
     49   return prefixes;
     50 }
     51 
     52 // static
     53 bool URLPrefix::IsURLPrefix(const base::string16& prefix) {
     54   const URLPrefixes& list = GetURLPrefixes();
     55   for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
     56     if (i->prefix == prefix)
     57       return true;
     58   return false;
     59 }
     60 
     61 // static
     62 const URLPrefix* URLPrefix::BestURLPrefix(const base::string16& text,
     63                                           const base::string16& prefix_suffix) {
     64   const URLPrefixes& list = GetURLPrefixes();
     65   for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
     66     if (PrefixMatch(*i, text, prefix_suffix))
     67       return &(*i);
     68   return NULL;
     69 }
     70 
     71 // static
     72 bool URLPrefix::PrefixMatch(const URLPrefix& prefix,
     73                             const base::string16& text,
     74                             const base::string16& prefix_suffix) {
     75   return StartsWith(text, prefix.prefix + prefix_suffix, false);
     76 }
     77 
     78 // static
     79 size_t URLPrefix::GetInlineAutocompleteOffset(
     80     const base::string16& input,
     81     const base::string16& fixed_up_input,
     82     const bool allow_www_prefix_without_scheme,
     83     const base::string16& text) {
     84   const URLPrefix* best_prefix = allow_www_prefix_without_scheme ?
     85       BestURLPrefixWithWWWCase(text, input) : BestURLPrefix(text, input);
     86   const base::string16* matching_string = &input;
     87   // If we failed to find a best_prefix initially, try again using a fixed-up
     88   // version of the user input.  This is especially useful to get about: URLs
     89   // to inline against chrome:// shortcuts.  (about: URLs are fixed up to the
     90   // chrome:// scheme.)
     91   if (!best_prefix && !fixed_up_input.empty() && (fixed_up_input != input)) {
     92     best_prefix = allow_www_prefix_without_scheme ?
     93         BestURLPrefixWithWWWCase(text, fixed_up_input) :
     94         BestURLPrefix(text, fixed_up_input);
     95     matching_string = &fixed_up_input;
     96   }
     97   return (best_prefix != NULL) ?
     98       (best_prefix->prefix.length() + matching_string->length()) :
     99       base::string16::npos;
    100 }
    101