1 // Copyright 2013 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/autofill/core/browser/autofill_regexes.h"
6
7 #include <map>
8 #include <utility>
9
10 #include "base/logging.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/memory/singleton.h"
13 #include "base/stl_util.h"
14 #include "base/strings/string16.h"
15 #include "third_party/icu/source/i18n/unicode/regex.h"
16
17 namespace {
18
19 // A singleton class that serves as a cache of compiled regex patterns.
20 class AutofillRegexes {
21 public:
22 static AutofillRegexes* GetInstance();
23
24 // Returns the compiled regex matcher corresponding to |pattern|.
25 icu::RegexMatcher* GetMatcher(const base::string16& pattern);
26
27 private:
28 AutofillRegexes();
29 ~AutofillRegexes();
30 friend struct DefaultSingletonTraits<AutofillRegexes>;
31
32 // Maps patterns to their corresponding regex matchers.
33 std::map<base::string16, icu::RegexMatcher*> matchers_;
34
35 DISALLOW_COPY_AND_ASSIGN(AutofillRegexes);
36 };
37
38 // static
GetInstance()39 AutofillRegexes* AutofillRegexes::GetInstance() {
40 return Singleton<AutofillRegexes>::get();
41 }
42
AutofillRegexes()43 AutofillRegexes::AutofillRegexes() {
44 }
45
~AutofillRegexes()46 AutofillRegexes::~AutofillRegexes() {
47 STLDeleteContainerPairSecondPointers(matchers_.begin(),
48 matchers_.end());
49 }
50
GetMatcher(const base::string16 & pattern)51 icu::RegexMatcher* AutofillRegexes::GetMatcher(const base::string16& pattern) {
52 if (!matchers_.count(pattern)) {
53 const icu::UnicodeString icu_pattern(pattern.data(), pattern.length());
54
55 UErrorCode status = U_ZERO_ERROR;
56 icu::RegexMatcher* matcher = new icu::RegexMatcher(icu_pattern,
57 UREGEX_CASE_INSENSITIVE,
58 status);
59 DCHECK(U_SUCCESS(status));
60
61 matchers_.insert(std::make_pair(pattern, matcher));
62 }
63
64 return matchers_[pattern];
65 }
66
67 } // namespace
68
69 namespace autofill {
70
MatchesPattern(const base::string16 & input,const base::string16 & pattern)71 bool MatchesPattern(const base::string16& input,
72 const base::string16& pattern) {
73 icu::RegexMatcher* matcher =
74 AutofillRegexes::GetInstance()->GetMatcher(pattern);
75 icu::UnicodeString icu_input(input.data(), input.length());
76 matcher->reset(icu_input);
77
78 UErrorCode status = U_ZERO_ERROR;
79 UBool match = matcher->find(0, status);
80 DCHECK(U_SUCCESS(status));
81 return !!match;
82 }
83
84 } // namespace autofill
85