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41 lines
981 B
C++
41 lines
981 B
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FML_ASCIITRIE_H_
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#define FLUTTER_FML_ASCIITRIE_H_
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#include <memory>
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#include <string>
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#include <vector>
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namespace fml {
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/// A trie for looking for ASCII prefixes.
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class AsciiTrie {
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public:
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struct TrieNode;
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typedef std::unique_ptr<TrieNode> TrieNodePtr;
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/// The max Ascii value.
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static const int kMaxAsciiValue = 128;
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/// Clear and insert all the entries into the trie.
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void Fill(const std::vector<std::string>& entries);
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/// Returns true if \p argument is prefixed by the contents of the trie.
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inline bool Query(const char* argument) {
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return !node_ || Query(node_.get(), argument);
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}
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struct TrieNode {
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TrieNodePtr children[kMaxAsciiValue];
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};
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private:
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static bool Query(TrieNode* trie, const char* query);
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TrieNodePtr node_;
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};
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} // namespace fml
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#endif
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