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1 /* | 1 /* |
2 * Copyright (C) 2010 Adam Barth. All rights reserved. | 2 * Copyright (C) 2010 Adam Barth. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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97 | 97 |
98 ChildrenVector children_; | 98 ChildrenVector children_; |
99 bool is_leaf_; | 99 bool is_leaf_; |
100 }; | 100 }; |
101 | 101 |
102 void Build(const String& text) { | 102 void Build(const String& text) { |
103 for (unsigned base = 0; base < text.length(); ++base) { | 103 for (unsigned base = 0; base < text.length(); ++base) { |
104 Node* current = &root_; | 104 Node* current = &root_; |
105 unsigned limit = std::min(base + depth_, text.length()); | 105 unsigned limit = std::min(base + depth_, text.length()); |
106 for (unsigned offset = 0; base + offset < limit; ++offset) { | 106 for (unsigned offset = 0; base + offset < limit; ++offset) { |
107 ASSERT(current != &leaf_); | 107 DCHECK_NE(current, &leaf_); |
108 Node*& child = current->at(Codebook::CodeWord(text[base + offset])); | 108 Node*& child = current->at(Codebook::CodeWord(text[base + offset])); |
109 if (!child) | 109 if (!child) |
110 child = base + offset + 1 == limit ? &leaf_ : new Node(); | 110 child = base + offset + 1 == limit ? &leaf_ : new Node(); |
111 current = child; | 111 current = child; |
112 } | 112 } |
113 } | 113 } |
114 } | 114 } |
115 | 115 |
116 Node root_; | 116 Node root_; |
117 unsigned depth_; | 117 unsigned depth_; |
118 | 118 |
119 // Instead of allocating a fresh empty leaf node for ever leaf in the tree | 119 // Instead of allocating a fresh empty leaf node for ever leaf in the tree |
120 // (there can be a lot of these), we alias all the leaves to this "static" | 120 // (there can be a lot of these), we alias all the leaves to this "static" |
121 // leaf node. | 121 // leaf node. |
122 Node leaf_; | 122 Node leaf_; |
123 }; | 123 }; |
124 | 124 |
125 } // namespace blink | 125 } // namespace blink |
126 | 126 |
127 #endif // SuffixTree_h | 127 #endif // SuffixTree_h |
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