63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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* Copyright (C) 2014, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LATINIME_NGRAM_UTILS_H
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#define LATINIME_NGRAM_UTILS_H
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#include "defines.h"
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namespace latinime {
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enum class NgramType : int {
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Unigram = 0,
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Bigram = 1,
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Trigram = 2,
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NotANgramType = -1,
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};
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namespace AllNgramTypes {
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// Use anonymous namespace to avoid ODR (One Definition Rule) violation.
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namespace {
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const NgramType ASCENDING[] = {
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NgramType::Unigram, NgramType::Bigram, NgramType::Trigram
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};
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const NgramType DESCENDING[] = {
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NgramType::Trigram, NgramType::Bigram, NgramType::Unigram
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};
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} // namespace
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} // namespace AllNgramTypes
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class NgramUtils final {
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public:
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static AK_FORCE_INLINE NgramType getNgramTypeFromWordCount(const int wordCount) {
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// Max supported ngram is (MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1)-gram.
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if (wordCount <= 0 || wordCount > MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1) {
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return NgramType::NotANgramType;
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}
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// Convert word count to 0-origin enum value.
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return static_cast<NgramType>(wordCount - 1);
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(NgramUtils);
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};
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}
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#endif /* LATINIME_NGRAM_UTILS_H */
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