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| 1 // Copyright (c) 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 #ifndef TOOLS_GN_PATTERN_H_ |
| 6 #define TOOLS_GN_PATTERN_H_ |
| 7 |
| 8 #include <string> |
| 9 #include <vector> |
| 10 |
| 11 #include "tools/gn/value.h" |
| 12 |
| 13 class Pattern { |
| 14 public: |
| 15 struct Subrange { |
| 16 enum Type { |
| 17 LITERAL, // Matches exactly the contents of the string. |
| 18 ANYTHING, // * (zero or more chars). |
| 19 PATH_BOUNDARY // '/' or beginning of string. |
| 20 }; |
| 21 |
| 22 Subrange(Type t, const std::string& l = std::string()) |
| 23 : type(t), |
| 24 literal(l) { |
| 25 } |
| 26 |
| 27 // Returns the minimum number of chars that this subrange requires. |
| 28 size_t MinSize() const { |
| 29 switch (type) { |
| 30 case LITERAL: |
| 31 return literal.size(); |
| 32 case ANYTHING: |
| 33 return 0; |
| 34 case PATH_BOUNDARY: |
| 35 return 0; // Can match beginning or end of string, which is 0 len. |
| 36 default: |
| 37 return 0; |
| 38 } |
| 39 } |
| 40 |
| 41 Type type; |
| 42 |
| 43 // When type == LITERAL this is the text to match. |
| 44 std::string literal; |
| 45 }; |
| 46 |
| 47 Pattern(const std::string& s); |
| 48 ~Pattern(); |
| 49 |
| 50 // Returns true if the current pattern matches the given string. |
| 51 bool MatchesString(const std::string& s) const; |
| 52 |
| 53 private: |
| 54 // allow_implicit_path_boundary determines if a path boundary should accept |
| 55 // matches at the beginning or end of the string. |
| 56 bool RecursiveMatch(const std::string& s, |
| 57 size_t begin_char, |
| 58 size_t subrange_index, |
| 59 bool allow_implicit_path_boundary) const; |
| 60 |
| 61 std::vector<Subrange> subranges_; |
| 62 |
| 63 // Set to true when the subranges are "*foo" ("ANYTHING" followed by a |
| 64 // literal). This covers most patterns so we optimize for this. |
| 65 bool is_suffix_; |
| 66 }; |
| 67 |
| 68 class PatternList { |
| 69 public: |
| 70 PatternList(); |
| 71 ~PatternList(); |
| 72 |
| 73 bool is_empty() const { return patterns_.empty(); } |
| 74 |
| 75 // Initializes the pattern list from a give list of pattern strings. Sets |
| 76 // |*err| on failure. |
| 77 void SetFromValue(const Value& v, Err* err); |
| 78 |
| 79 bool MatchesString(const std::string& s) const; |
| 80 bool MatchesValue(const Value& v) const; |
| 81 |
| 82 private: |
| 83 std::vector<Pattern> patterns_; |
| 84 }; |
| 85 |
| 86 #endif // TOOLS_GN_PATTERN_H_ |
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