79 lines
2.9 KiB
C++
79 lines
2.9 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_CONTEXT_H
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#define LATINIME_NGRAM_CONTEXT_H
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#include <array>
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#include "defines.h"
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#include "utils/int_array_view.h"
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namespace latinime {
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class DictionaryStructureWithBufferPolicy;
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class NgramContext {
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public:
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// No prev word information.
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NgramContext();
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// Copy constructor to use this class with std::vector and use this class as a return value.
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NgramContext(const NgramContext &ngramContext);
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// Construct from previous words.
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NgramContext(const int prevWordCodePoints[][MAX_WORD_LENGTH],
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const int *const prevWordCodePointCount, const bool *const isBeginningOfSentence,
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const size_t prevWordCount);
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// Construct from a previous word.
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NgramContext(const int *const prevWordCodePoints, const int prevWordCodePointCount,
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const bool isBeginningOfSentence);
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size_t getPrevWordCount() const {
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return mPrevWordCount;
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}
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bool isValid() const;
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template<size_t N>
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const WordIdArrayView getPrevWordIds(
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const DictionaryStructureWithBufferPolicy *const dictStructurePolicy,
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WordIdArray<N> *const prevWordIdBuffer, const bool tryLowerCaseSearch) const {
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for (size_t i = 0; i < std::min(mPrevWordCount, N); ++i) {
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prevWordIdBuffer->at(i) = getWordId(dictStructurePolicy, mPrevWordCodePoints[i],
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mPrevWordCodePointCount[i], mIsBeginningOfSentence[i], tryLowerCaseSearch);
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}
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return WordIdArrayView::fromArray(*prevWordIdBuffer).limit(mPrevWordCount);
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}
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// n is 1-indexed.
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const CodePointArrayView getNthPrevWordCodePoints(const size_t n) const;
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// n is 1-indexed.
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bool isNthPrevWordBeginningOfSentence(const size_t n) const;
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private:
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DISALLOW_ASSIGNMENT_OPERATOR(NgramContext);
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static int getWordId(const DictionaryStructureWithBufferPolicy *const dictStructurePolicy,
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const int *const wordCodePoints, const int wordCodePointCount,
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const bool isBeginningOfSentence, const bool tryLowerCaseSearch);
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void clear();
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const size_t mPrevWordCount;
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int mPrevWordCodePoints[MAX_PREV_WORD_COUNT_FOR_N_GRAM][MAX_WORD_LENGTH];
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int mPrevWordCodePointCount[MAX_PREV_WORD_COUNT_FOR_N_GRAM];
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bool mIsBeginningOfSentence[MAX_PREV_WORD_COUNT_FOR_N_GRAM];
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};
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} // namespace latinime
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#endif // LATINIME_NGRAM_CONTEXT_H
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