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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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98 | 98 |
99 ChildrenVector m_children; | 99 ChildrenVector m_children; |
100 bool m_isLeaf; | 100 bool m_isLeaf; |
101 }; | 101 }; |
102 | 102 |
103 void build(const String& text) { | 103 void build(const String& text) { |
104 for (unsigned base = 0; base < text.length(); ++base) { | 104 for (unsigned base = 0; base < text.length(); ++base) { |
105 Node* current = &m_root; | 105 Node* current = &m_root; |
106 unsigned limit = std::min(base + m_depth, text.length()); | 106 unsigned limit = std::min(base + m_depth, text.length()); |
107 for (unsigned offset = 0; base + offset < limit; ++offset) { | 107 for (unsigned offset = 0; base + offset < limit; ++offset) { |
108 ASSERT(current != &m_leaf); | 108 DCHECK_NE(current, &m_leaf); |
109 Node*& child = current->at(Codebook::codeWord(text[base + offset])); | 109 Node*& child = current->at(Codebook::codeWord(text[base + offset])); |
110 if (!child) | 110 if (!child) |
111 child = base + offset + 1 == limit ? &m_leaf : new Node(); | 111 child = base + offset + 1 == limit ? &m_leaf : new Node(); |
112 current = child; | 112 current = child; |
113 } | 113 } |
114 } | 114 } |
115 } | 115 } |
116 | 116 |
117 Node m_root; | 117 Node m_root; |
118 unsigned m_depth; | 118 unsigned m_depth; |
119 | 119 |
120 // Instead of allocating a fresh empty leaf node for ever leaf in the tree | 120 // Instead of allocating a fresh empty leaf node for ever leaf in the tree |
121 // (there can be a lot of these), we alias all the leaves to this "static" | 121 // (there can be a lot of these), we alias all the leaves to this "static" |
122 // leaf node. | 122 // leaf node. |
123 Node m_leaf; | 123 Node m_leaf; |
124 }; | 124 }; |
125 | 125 |
126 } // namespace blink | 126 } // namespace blink |
127 | 127 |
128 #endif // SuffixTree_h | 128 #endif // SuffixTree_h |
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