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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/autocomplete/url_prefix.h"
#include "base/basictypes.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/autocomplete/autocomplete_input.h"
namespace {
// Like URLPrefix::BestURLPrefix() except also handles the prefix of
// "www.".
const URLPrefix* BestURLPrefixWithWWWCase(
const base::string16& text,
const base::string16& prefix_suffix) {
CR_DEFINE_STATIC_LOCAL(URLPrefix, www_prefix,
(base::ASCIIToUTF16("www."), 1));
const URLPrefix* best_prefix = URLPrefix::BestURLPrefix(text, prefix_suffix);
if ((best_prefix == NULL) ||
(best_prefix->num_components < www_prefix.num_components)) {
if (URLPrefix::PrefixMatch(www_prefix, text, prefix_suffix))
best_prefix = &www_prefix;
}
return best_prefix;
}
} // namespace
URLPrefix::URLPrefix(const base::string16& prefix, size_t num_components)
: prefix(prefix),
num_components(num_components) {
}
// static
const URLPrefixes& URLPrefix::GetURLPrefixes() {
CR_DEFINE_STATIC_LOCAL(URLPrefixes, prefixes, ());
if (prefixes.empty()) {
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://www."), 2));
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://www."), 2));
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://ftp."), 2));
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://www."), 2));
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("https://"), 1));
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("http://"), 1));
prefixes.push_back(URLPrefix(base::ASCIIToUTF16("ftp://"), 1));
prefixes.push_back(URLPrefix(base::string16(), 0));
}
return prefixes;
}
// static
bool URLPrefix::IsURLPrefix(const base::string16& prefix) {
const URLPrefixes& list = GetURLPrefixes();
for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
if (i->prefix == prefix)
return true;
return false;
}
// static
const URLPrefix* URLPrefix::BestURLPrefix(const base::string16& text,
const base::string16& prefix_suffix) {
const URLPrefixes& list = GetURLPrefixes();
for (URLPrefixes::const_iterator i = list.begin(); i != list.end(); ++i)
if (PrefixMatch(*i, text, prefix_suffix))
return &(*i);
return NULL;
}
// static
bool URLPrefix::PrefixMatch(const URLPrefix& prefix,
const base::string16& text,
const base::string16& prefix_suffix) {
return StartsWith(text, prefix.prefix + prefix_suffix, false);
}
// static
size_t URLPrefix::GetInlineAutocompleteOffset(
const AutocompleteInput& input,
const AutocompleteInput& fixed_up_input,
const bool allow_www_prefix_without_scheme,
const base::string16& text) {
const URLPrefix* best_prefix = allow_www_prefix_without_scheme ?
BestURLPrefixWithWWWCase(text, input.text()) :
BestURLPrefix(text, input.text());
const base::string16* matching_string = &input.text();
// If we failed to find a best_prefix initially, try again using a fixed-up
// version of the user input. This is especially useful to get about: URLs
// to inline against chrome:// shortcuts. (about: URLs are fixed up to the
// chrome:// scheme.)
if ((best_prefix == NULL) && !fixed_up_input.text().empty() &&
(fixed_up_input.text() != input.text())) {
best_prefix = allow_www_prefix_without_scheme ?
BestURLPrefixWithWWWCase(text, fixed_up_input.text()) :
BestURLPrefix(text, fixed_up_input.text());
matching_string = &fixed_up_input.text();
}
return (best_prefix != NULL) ?
(best_prefix->prefix.length() + matching_string->length()) :
base::string16::npos;
}
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