124 lines
4.8 KiB
C++
124 lines
4.8 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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#include "dictionary/property/ngram_context.h"
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#include "dictionary/interface/dictionary_structure_with_buffer_policy.h"
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#include "utils/char_utils.h"
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namespace latinime {
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NgramContext::NgramContext() : mPrevWordCount(0) {}
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NgramContext::NgramContext(const NgramContext &ngramContext)
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: mPrevWordCount(ngramContext.mPrevWordCount) {
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for (size_t i = 0; i < mPrevWordCount; ++i) {
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mPrevWordCodePointCount[i] = ngramContext.mPrevWordCodePointCount[i];
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memmove(mPrevWordCodePoints[i], ngramContext.mPrevWordCodePoints[i],
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sizeof(mPrevWordCodePoints[i][0]) * mPrevWordCodePointCount[i]);
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mIsBeginningOfSentence[i] = ngramContext.mIsBeginningOfSentence[i];
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}
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}
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NgramContext::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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: mPrevWordCount(std::min(NELEMS(mPrevWordCodePoints), prevWordCount)) {
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clear();
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for (size_t i = 0; i < mPrevWordCount; ++i) {
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if (prevWordCodePointCount[i] < 0 || prevWordCodePointCount[i] > MAX_WORD_LENGTH) {
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continue;
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}
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memmove(mPrevWordCodePoints[i], prevWordCodePoints[i],
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sizeof(mPrevWordCodePoints[i][0]) * prevWordCodePointCount[i]);
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mPrevWordCodePointCount[i] = prevWordCodePointCount[i];
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mIsBeginningOfSentence[i] = isBeginningOfSentence[i];
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}
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}
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NgramContext::NgramContext(const int *const prevWordCodePoints, const int prevWordCodePointCount,
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const bool isBeginningOfSentence) : mPrevWordCount(1) {
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clear();
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if (prevWordCodePointCount > MAX_WORD_LENGTH || !prevWordCodePoints) {
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return;
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}
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memmove(mPrevWordCodePoints[0], prevWordCodePoints,
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sizeof(mPrevWordCodePoints[0][0]) * prevWordCodePointCount);
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mPrevWordCodePointCount[0] = prevWordCodePointCount;
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mIsBeginningOfSentence[0] = isBeginningOfSentence;
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}
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bool NgramContext::isValid() const {
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if (mPrevWordCodePointCount[0] > 0) {
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return true;
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}
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if (mIsBeginningOfSentence[0]) {
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return true;
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}
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return false;
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}
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const CodePointArrayView NgramContext::getNthPrevWordCodePoints(const size_t n) const {
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if (n <= 0 || n > mPrevWordCount) {
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return CodePointArrayView();
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}
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return CodePointArrayView(mPrevWordCodePoints[n - 1], mPrevWordCodePointCount[n - 1]);
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}
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bool NgramContext::isNthPrevWordBeginningOfSentence(const size_t n) const {
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if (n <= 0 || n > mPrevWordCount) {
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return false;
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}
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return mIsBeginningOfSentence[n - 1];
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}
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/* static */ int NgramContext::getWordId(
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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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if (!dictStructurePolicy || !wordCodePoints || wordCodePointCount > MAX_WORD_LENGTH) {
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return NOT_A_WORD_ID;
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}
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int codePoints[MAX_WORD_LENGTH];
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int codePointCount = wordCodePointCount;
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memmove(codePoints, wordCodePoints, sizeof(int) * codePointCount);
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if (isBeginningOfSentence) {
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codePointCount = CharUtils::attachBeginningOfSentenceMarker(codePoints, codePointCount,
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MAX_WORD_LENGTH);
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if (codePointCount <= 0) {
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return NOT_A_WORD_ID;
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}
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}
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const CodePointArrayView codePointArrayView(codePoints, codePointCount);
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const int wordId = dictStructurePolicy->getWordId(codePointArrayView,
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false /* forceLowerCaseSearch */);
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if (wordId != NOT_A_WORD_ID || !tryLowerCaseSearch) {
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// Return the id when when the word was found or doesn't try lower case search.
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return wordId;
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}
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// Check bigrams for lower-cased previous word if original was not found. Useful for
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// auto-capitalized words like "The [current_word]".
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return dictStructurePolicy->getWordId(codePointArrayView, true /* forceLowerCaseSearch */);
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}
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void NgramContext::clear() {
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for (size_t i = 0; i < NELEMS(mPrevWordCodePoints); ++i) {
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mPrevWordCodePointCount[i] = 0;
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mIsBeginningOfSentence[i] = false;
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}
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}
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} // namespace latinime
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