1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBTEXTCLASSIFIER_UTILS_SENTENCEPIECE_MATCHER_H_ 18 #define LIBTEXTCLASSIFIER_UTILS_SENTENCEPIECE_MATCHER_H_ 19 20 #include <vector> 21 #include "utils/strings/stringpiece.h" 22 23 namespace libtextclassifier3 { 24 25 struct TrieMatch { TrieMatchTrieMatch26 TrieMatch() {} TrieMatchTrieMatch27 TrieMatch(int id, int match_length) : id(id), match_length(match_length) {} 28 int id = -1; 29 int match_length = -1; 30 }; 31 32 class SentencePieceMatcher { 33 public: ~SentencePieceMatcher()34 virtual ~SentencePieceMatcher() {} 35 36 // Find matches that are prefixes of a string. 37 virtual bool FindAllPrefixMatches(StringPiece input, 38 std::vector<TrieMatch>* matches) const = 0; 39 40 // Find the longest prefix match of a string. 41 virtual bool LongestPrefixMatch(StringPiece input, 42 TrieMatch* longest_match) const = 0; 43 }; 44 45 } // namespace libtextclassifier3 46 47 #endif // LIBTEXTCLASSIFIER_UTILS_SENTENCEPIECE_MATCHER_H_ 48