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| 1 // Copyright 2005-2009 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 // | |
| 16 // Implementors: There is only one function to implement -- DoMatchImpl | |
| 17 // See below | |
| 18 | |
| 19 #ifndef OMAHA_COMMON_REGEXP_H__ | |
| 20 #define OMAHA_COMMON_REGEXP_H__ | |
| 21 | |
| 22 #include <atlstr.h> | |
| 23 | |
| 24 namespace omaha { | |
| 25 | |
| 26 // Interface for regular expression matching. Also corresponds to a | |
| 27 // pre-compiled regular expression. An "RE" object is safe for | |
| 28 // concurrent use by multiple threads. | |
| 29 class RE { | |
| 30 public: | |
| 31 | |
| 32 // Matches "text" against "pattern". If pointer arguments are | |
| 33 // supplied, copies matched sub-patterns into them. Use braces | |
| 34 // "{", "}" within the regexp to indicate a pattern to be copied. | |
| 35 // | |
| 36 // Returns true iff all of the following conditions are satisfied: | |
| 37 // a. some substring of "text" matches "pattern" | |
| 38 // b. The number of matched sub-patterns is >= number of supplied pointers | |
| 39 static bool PartialMatch(const TCHAR* text, const RE& re, // 3..16 args | |
| 40 CString * a0 = NULL, | |
| 41 CString * a1 = NULL, | |
| 42 CString * a2 = NULL, | |
| 43 CString * a3 = NULL, | |
| 44 CString * a4 = NULL, | |
| 45 CString * a5 = NULL, | |
| 46 CString * a6 = NULL, | |
| 47 CString * a7 = NULL, | |
| 48 CString * a8 = NULL, | |
| 49 CString * a9 = NULL, | |
| 50 CString * a10 = NULL, | |
| 51 CString * a11 = NULL, | |
| 52 CString * a12 = NULL, | |
| 53 CString * a13 = NULL, | |
| 54 CString * a14 = NULL, | |
| 55 CString * a15 = NULL); | |
| 56 | |
| 57 // Like PartialMatch(), except the "input" is advanced past the matched | |
| 58 // text. Note: "input" is modified iff this routine returns true. | |
| 59 // For example, "FindAndConsume(s, "{\\w+}", &word)" finds the next | |
| 60 // word in "s" and stores it in "word". | |
| 61 static bool FindAndConsume(const TCHAR** input, const RE& re, | |
| 62 CString * a0 = NULL, | |
| 63 CString * a1 = NULL, | |
| 64 CString * a2 = NULL, | |
| 65 CString * a3 = NULL, | |
| 66 CString * a4 = NULL, | |
| 67 CString * a5 = NULL, | |
| 68 CString * a6 = NULL, | |
| 69 CString * a7 = NULL, | |
| 70 CString * a8 = NULL, | |
| 71 CString * a9 = NULL, | |
| 72 CString * a10 = NULL, | |
| 73 CString * a11 = NULL, | |
| 74 CString * a12 = NULL, | |
| 75 CString * a13 = NULL, | |
| 76 CString * a14 = NULL, | |
| 77 CString * a15 = NULL); | |
| 78 | |
| 79 protected: | |
| 80 | |
| 81 // The behavior of this function is subject to how it's used | |
| 82 // in PartialMatch() and FindAndConsume() above. See the header | |
| 83 // description of those functions to understand how an implementation | |
| 84 // should behave. | |
| 85 // text is the text we're looking in | |
| 86 // args is where matches should be outputted | |
| 87 // n is the number of CStrings in args | |
| 88 // match_end is a pointer to the position in text that | |
| 89 // we ended matching on | |
| 90 // returns true if data was found, false otherwise | |
| 91 // Example:Suppose text = "google 1\nYahoo! 2\n ..." and the regexp | |
| 92 // is something like "{\w+} \d". If args has two CStrings (n=2), | |
| 93 // then args[0] = "google", arg[1] = "1" and match_end will point to the \n | |
| 94 // before "Yahoo!" | |
| 95 virtual bool DoMatchImpl(const TCHAR *text, | |
| 96 CString * args[], | |
| 97 int n, | |
| 98 const TCHAR ** match_end) const = 0; | |
| 99 }; | |
| 100 | |
| 101 } // namespace omaha | |
| 102 | |
| 103 #endif // OMAHA_COMMON_REGEXP_H__ | |
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