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// Copyright (c) 2011 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/autofill/autofill_regexes.h"
#include <map>
#include <utility>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/stl_util.h"
#include "base/string16.h"
#include "third_party/icu/public/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 string16& pattern);
private:
AutofillRegexes();
~AutofillRegexes();
friend struct DefaultSingletonTraits<AutofillRegexes>;
// Maps patterns to their corresponding regex matchers.
std::map<string16, icu::RegexMatcher*> matchers_;
DISALLOW_COPY_AND_ASSIGN(AutofillRegexes);
};
// static
AutofillRegexes* AutofillRegexes::GetInstance() {
return Singleton<AutofillRegexes>::get();
}
AutofillRegexes::AutofillRegexes() {
}
AutofillRegexes::~AutofillRegexes() {
STLDeleteContainerPairSecondPointers(matchers_.begin(),
matchers_.end());
}
icu::RegexMatcher* AutofillRegexes::GetMatcher(const string16& pattern) {
if (!matchers_.count(pattern)) {
const icu::UnicodeString icu_pattern(pattern.data(), pattern.length());
UErrorCode status = U_ZERO_ERROR;
icu::RegexMatcher* matcher = new icu::RegexMatcher(icu_pattern,
UREGEX_CASE_INSENSITIVE,
status);
DCHECK(U_SUCCESS(status));
matchers_.insert(std::make_pair(pattern, matcher));
}
return matchers_[pattern];
}
} // namespace
namespace autofill {
bool MatchesPattern(const string16& input, const string16& pattern) {
icu::RegexMatcher* matcher =
AutofillRegexes::GetInstance()->GetMatcher(pattern);
icu::UnicodeString icu_input(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;
}
} // namespace autofill
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