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| 1 // Copyright (C) 2011 Google Inc. | |
| 2 // | |
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); | |
| 4 // you may not use this file except in compliance with the License. | |
| 5 // You may obtain a copy of the License at | |
| 6 // | |
| 7 // http://www.apache.org/licenses/LICENSE-2.0 | |
| 8 // | |
| 9 // Unless required by applicable law or agreed to in writing, software | |
| 10 // distributed under the License is distributed on an "AS IS" BASIS, | |
| 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 12 // See the License for the specific language governing permissions and | |
| 13 // limitations under the License. | |
| 14 | |
| 15 // Author: George Yakovlev | |
| 16 // Philippe Liard | |
| 17 | |
| 18 #include "regexp_adapter.h" | |
| 19 | |
| 20 #include <cstddef> | |
| 21 #include <string> | |
| 22 | |
| 23 #include <re2/re2.h> | |
| 24 #include <re2/stringpiece.h> | |
| 25 | |
| 26 #include "base/basictypes.h" | |
| 27 #include "base/logging.h" | |
| 28 #include "stringutil.h" | |
| 29 | |
| 30 namespace i18n { | |
| 31 namespace phonenumbers { | |
| 32 | |
| 33 using re2::StringPiece; | |
| 34 | |
| 35 // Implementation of RegExpInput abstract class. | |
| 36 class RE2RegExpInput : public RegExpInput { | |
| 37 public: | |
| 38 explicit RE2RegExpInput(const string& utf8_input) | |
| 39 : string_(utf8_input), | |
| 40 utf8_input_(string_) {} | |
| 41 | |
| 42 virtual string ToString() const { | |
| 43 return utf8_input_.ToString(); | |
| 44 } | |
| 45 | |
| 46 StringPiece* Data() { | |
| 47 return &utf8_input_; | |
| 48 } | |
| 49 | |
| 50 private: | |
| 51 // string_ holds the string referenced by utf8_input_ as StringPiece doesn't | |
| 52 // copy the string passed in. | |
| 53 const string string_; | |
| 54 StringPiece utf8_input_; | |
| 55 }; | |
| 56 | |
| 57 namespace { | |
| 58 | |
| 59 template <typename Function, typename Input> | |
| 60 bool DispatchRE2Call(Function regex_function, | |
| 61 Input input, | |
| 62 const RE2& regexp, | |
| 63 string* out1, | |
| 64 string* out2, | |
| 65 string* out3) { | |
| 66 if (out3) { | |
| 67 return regex_function(input, regexp, out1, out2, out3); | |
| 68 } | |
| 69 if (out2) { | |
| 70 return regex_function(input, regexp, out1, out2); | |
| 71 } | |
| 72 if (out1) { | |
| 73 return regex_function(input, regexp, out1); | |
| 74 } | |
| 75 return regex_function(input, regexp); | |
| 76 } | |
| 77 | |
| 78 // Replaces unescaped dollar-signs with backslashes. Backslashes are deleted | |
| 79 // when they escape dollar-signs. | |
| 80 string TransformRegularExpressionToRE2Syntax(const string& regex) { | |
| 81 string re2_regex(regex); | |
| 82 if (GlobalReplaceSubstring("$", "\\", &re2_regex) == 0) { | |
| 83 return regex; | |
| 84 } | |
| 85 // If we replaced a dollar sign with a backslash and there are now two | |
| 86 // backslashes in the string, we assume that the dollar-sign was previously | |
| 87 // escaped and that we need to retain it. To do this, we replace pairs of | |
| 88 // backslashes with a dollar sign. | |
| 89 GlobalReplaceSubstring("\\\\", "$", &re2_regex); | |
| 90 return re2_regex; | |
| 91 } | |
| 92 | |
| 93 } // namespace | |
| 94 | |
| 95 // Implementation of RegExp abstract class. | |
| 96 class RE2RegExp : public RegExp { | |
| 97 public: | |
| 98 explicit RE2RegExp(const string& utf8_regexp) | |
| 99 : utf8_regexp_(utf8_regexp) {} | |
| 100 | |
| 101 virtual bool Consume(RegExpInput* input_string, | |
| 102 bool anchor_at_start, | |
| 103 string* matched_string1, | |
| 104 string* matched_string2, | |
| 105 string* matched_string3) const { | |
| 106 DCHECK(input_string); | |
| 107 StringPiece* utf8_input = | |
| 108 static_cast<RE2RegExpInput*>(input_string)->Data(); | |
| 109 | |
| 110 if (anchor_at_start) { | |
| 111 return DispatchRE2Call(RE2::Consume, utf8_input, utf8_regexp_, | |
| 112 matched_string1, matched_string2, | |
| 113 matched_string3); | |
| 114 } else { | |
| 115 return DispatchRE2Call(RE2::FindAndConsume, utf8_input, utf8_regexp_, | |
| 116 matched_string1, matched_string2, | |
| 117 matched_string3); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 virtual bool Match(const string& input_string, | |
| 122 bool full_match, | |
| 123 string* matched_string) const { | |
| 124 if (full_match) { | |
| 125 return DispatchRE2Call(RE2::FullMatch, input_string, utf8_regexp_, | |
| 126 matched_string, NULL, NULL); | |
| 127 } else { | |
| 128 return DispatchRE2Call(RE2::PartialMatch, input_string, utf8_regexp_, | |
| 129 matched_string, NULL, NULL); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 virtual bool Replace(string* string_to_process, | |
| 134 bool global, | |
| 135 const string& replacement_string) const { | |
| 136 DCHECK(string_to_process); | |
| 137 const string re2_replacement_string = | |
| 138 TransformRegularExpressionToRE2Syntax(replacement_string); | |
| 139 if (global) { | |
| 140 return RE2::GlobalReplace(string_to_process, utf8_regexp_, | |
| 141 re2_replacement_string); | |
| 142 } else { | |
| 143 return RE2::Replace(string_to_process, utf8_regexp_, | |
| 144 re2_replacement_string); | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 private: | |
| 149 RE2 utf8_regexp_; | |
| 150 }; | |
| 151 | |
| 152 // Implementation of the adapter static factory methods. | |
| 153 // RE2 RegExp engine is the default implementation. | |
| 154 RegExpInput* RegExpInput::Create(const string& utf8_input) { | |
| 155 return new RE2RegExpInput(utf8_input); | |
| 156 } | |
| 157 | |
| 158 RegExp* RegExp::Create(const string& utf8_regexp) { | |
| 159 return new RE2RegExp(utf8_regexp); | |
| 160 } | |
| 161 | |
| 162 } // namespace phonenumbers | |
| 163 } // namespace i18n | |
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Chromium Code Reviews
Issue 8790002:
Re-committing http://codereview.chromium.org/8736001/ originally committed revision=112305 (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/