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// Copyright 2013 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 "components/autofill/core/common/autofill_regexes.h"
#include <memory>
#include <unordered_map>
#include <utility>
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/singleton.h"
#include "base/strings/string16.h"
#include "third_party/icu/source/i18n/unicode/regex.h"
namespace {
// A singleton class that serves as a cache of compiled regex patterns.
class AutofillRegexes {
public:
static AutofillRegexes* GetInstance();
// Returns the compiled regex matcher corresponding to |pattern|.
icu::RegexMatcher* GetMatcher(const base::string16& pattern);
private:
AutofillRegexes();
~AutofillRegexes();
friend struct base::DefaultSingletonTraits<AutofillRegexes>;
// Maps patterns to their corresponding regex matchers.
std::unordered_map<base::string16, std::unique_ptr<icu::RegexMatcher>>
matchers_;
DISALLOW_COPY_AND_ASSIGN(AutofillRegexes);
};
// static
AutofillRegexes* AutofillRegexes::GetInstance() {
return base::Singleton<AutofillRegexes>::get();
}
AutofillRegexes::AutofillRegexes() {
}
AutofillRegexes::~AutofillRegexes() {
}
icu::RegexMatcher* AutofillRegexes::GetMatcher(const base::string16& pattern) {
auto it = matchers_.find(pattern);
if (it == matchers_.end()) {
const icu::UnicodeString icu_pattern(FALSE, pattern.data(),
pattern.length());
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::RegexMatcher> matcher(
new icu::RegexMatcher(icu_pattern, UREGEX_CASE_INSENSITIVE, status));
DCHECK(U_SUCCESS(status));
auto result = matchers_.insert(std::make_pair(pattern, std::move(matcher)));
DCHECK(result.second);
it = result.first;
}
return it->second.get();
}
} // namespace
namespace autofill {
bool MatchesPattern(const base::string16& input,
const base::string16& pattern) {
icu::RegexMatcher* matcher =
AutofillRegexes::GetInstance()->GetMatcher(pattern);
icu::UnicodeString icu_input(FALSE, input.data(), input.length());
matcher->reset(icu_input);
UErrorCode status = U_ZERO_ERROR;
UBool match = matcher->find(0, status);
DCHECK(U_SUCCESS(status));
return match == TRUE;
}
} // namespace autofill
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