Index: chrome/common/extensions/matcher/regex_set_matcher.h |
diff --git a/chrome/common/extensions/matcher/regex_set_matcher.h b/chrome/common/extensions/matcher/regex_set_matcher.h |
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+// Copyright (c) 2012 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. |
+ |
+#ifndef CHROME_COMMON_EXTENSIONS_MATCHER_REGEX_SET_MATCHER_H_ |
+#define CHROME_COMMON_EXTENSIONS_MATCHER_REGEX_SET_MATCHER_H_ |
+ |
+#include <map> |
+#include <set> |
+#include <string> |
+#include <vector> |
+ |
+#include "base/memory/scoped_ptr.h" |
+#include "chrome/common/extensions/matcher/string_pattern.h" |
+#include "chrome/common/extensions/matcher/substring_set_matcher.h" |
+ |
+namespace re2 { |
+class FilteredRE2; |
+} |
+ |
+namespace extensions { |
+ |
+// Efficiently matches URLs against a collection of regular expressions, |
+// using FilteredRE2 to reduce the number of regexes that must be matched |
+// by pre-filtering with substring matching. See: |
+// http://swtch.com/~rsc/regexp/regexp3.html#analysis |
+class RegexSetMatcher { |
+ public: |
+ RegexSetMatcher(); |
+ virtual ~RegexSetMatcher(); |
+ |
+ // Adds the regex patterns in |regex_list| to the matcher. Also rebuilds |
+ // the FilteredRE2 matcher; thus, for efficiency, prefer adding multiple |
+ // patterns at once. |
+ // Ownership of the patterns remains with the caller. |
+ void AddPatterns(const std::vector<const StringPattern*>& regex_list); |
+ |
+ // Removes all regex patterns. |
+ void ClearPatterns(); |
+ |
+ // Appends the IDs of regular expressions in our set that match the |text| |
+ // to |matches|. |
+ bool Match(const std::string& text, |
+ std::set<StringPattern::ID>* matches) const; |
+ |
+ private: |
+ typedef int RE2ID; |
+ typedef std::map<StringPattern::ID, const StringPattern*> RegexMap; |
+ typedef std::vector<StringPattern::ID> RE2IDMap; |
+ |
+ // Use Aho-Corasick SubstringSetMatcher to find which literal patterns |
+ // match the |text|. |
+ std::vector<RE2ID> FindSubstringMatches(const std::string& text) const; |
+ |
+ // Rebuild FilteredRE2 from scratch. Needs to be called whenever |
+ // our set of regexes changes. |
+ // TODO(yoz): investigate if it could be done incrementally; |
+ // apparently not supported by FilteredRE2. |
+ void RebuildMatcher(); |
+ |
+ // Clean up StringPatterns in |substring_patterns_|. |
+ void DeleteSubstringPatterns(); |
+ |
+ // Mapping of regex StringPattern::IDs to regexes. |
+ RegexMap regexes_; |
+ // Mapping of RE2IDs from FilteredRE2 (which are assigned in order) |
+ // to regex StringPattern::IDs. |
+ RE2IDMap re2_id_map_; |
+ |
+ scoped_ptr<re2::FilteredRE2> filtered_re2_; |
+ scoped_ptr<SubstringSetMatcher> substring_matcher_; |
+ |
+ // The substring patterns from FilteredRE2, which are used in |
+ // |substring_matcher_| but whose lifetime is managed here. |
+ std::vector<const StringPattern*> substring_patterns_; |
+}; |
+ |
+} // namespace extensions |
+ |
+#endif // CHROME_COMMON_EXTENSIONS_MATCHER_REGEX_SET_MATCHER_H_ |