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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/omnibox/browser/url_prefix.h"
#include "base/check_op.h"
#include "base/i18n/case_conversion.h"
#include "base/logging.h"
#include "base/no_destructor.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
namespace {
// Implements URLPrefix::BestURLPrefix(). Expects parameters to
// already be lowercased.
const URLPrefix* BestURLPrefixInternal(
const std::u16string& lower_text,
const std::u16string& lower_prefix_suffix) {
const URLPrefixes& list = URLPrefix::GetURLPrefixes();
for (const URLPrefix& prefix : list) {
if (base::StartsWith(lower_text, prefix.prefix + lower_prefix_suffix,
base::CompareCase::SENSITIVE))
return &prefix;
}
return nullptr;
}
// Like BestURLPrefixInternal() except also handles the prefix of "www.".
const URLPrefix* BestURLPrefixWithWWWCase(
const std::u16string& lower_text,
const std::u16string& lower_prefix_suffix) {
static base::NoDestructor<URLPrefix> www_prefix(u"www.", 1);
const URLPrefix* best_prefix =
BestURLPrefixInternal(lower_text, lower_prefix_suffix);
if ((best_prefix == nullptr ||
best_prefix->num_components < www_prefix->num_components) &&
base::StartsWith(lower_text, www_prefix->prefix + lower_prefix_suffix,
base::CompareCase::SENSITIVE))
best_prefix = www_prefix.get();
return best_prefix;
}
} // namespace
URLPrefix::URLPrefix(const std::u16string& lower_prefix, size_t num_components)
: prefix(lower_prefix), num_components(num_components) {
// Input prefix must be in lowercase.
DCHECK_EQ(lower_prefix, base::i18n::ToLower(lower_prefix));
}
// static
const URLPrefixes& URLPrefix::GetURLPrefixes() {
static base::NoDestructor<URLPrefixes> prefixes([]() {
URLPrefixes prefixes;
// Keep this list in descending number of components.
prefixes.push_back(URLPrefix(u"http://www.", 2));
prefixes.push_back(URLPrefix(u"https://www.", 2));
prefixes.push_back(URLPrefix(u"ftp://www.", 2));
prefixes.push_back(URLPrefix(u"http://", 1));
prefixes.push_back(URLPrefix(u"https://", 1));
prefixes.push_back(URLPrefix(u"ftp://", 1));
prefixes.push_back(URLPrefix(std::u16string(), 0));
return prefixes;
}());
return *prefixes;
}
// static
const URLPrefix* URLPrefix::BestURLPrefix(const std::u16string& text,
const std::u16string& prefix_suffix) {
return BestURLPrefixInternal(base::i18n::ToLower(text),
base::i18n::ToLower(prefix_suffix));
}
// static
size_t URLPrefix::GetInlineAutocompleteOffset(
const std::u16string& input,
const std::u16string& fixed_up_input,
const bool allow_www_prefix_without_scheme,
const std::u16string& text) {
const std::u16string lower_text(base::i18n::ToLower(text));
const std::u16string lower_input(base::i18n::ToLower(input));
const URLPrefix* best_prefix =
allow_www_prefix_without_scheme
? BestURLPrefixWithWWWCase(lower_text, lower_input)
: BestURLPrefixInternal(lower_text, lower_input);
const std::u16string* matching_string = &input;
// 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 && !fixed_up_input.empty() && (fixed_up_input != input)) {
const std::u16string lower_fixed_up_input(
base::i18n::ToLower(fixed_up_input));
best_prefix =
allow_www_prefix_without_scheme
? BestURLPrefixWithWWWCase(lower_text, lower_fixed_up_input)
: BestURLPrefixInternal(lower_text, lower_fixed_up_input);
matching_string = &fixed_up_input;
}
return (best_prefix != nullptr)
? (best_prefix->prefix.length() + matching_string->length())
: std::u16string::npos;
}
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