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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.latin;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import androidx.test.InstrumentationRegistry;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import com.android.inputmethod.latin.NgramContext.WordInfo;
import com.android.inputmethod.latin.settings.SpacingAndPunctuations;
import com.android.inputmethod.latin.utils.NgramContextUtils;
import org.junit.Test;
import org.junit.runner.RunWith;
@SmallTest
@RunWith(AndroidJUnit4.class)
public class NgramContextTests {
@Test
public void testConstruct() {
assertEquals(new NgramContext(new WordInfo("a")), new NgramContext(new WordInfo("a")));
assertEquals(new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO),
new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO));
assertEquals(new NgramContext(WordInfo.EMPTY_WORD_INFO),
new NgramContext(WordInfo.EMPTY_WORD_INFO));
assertEquals(new NgramContext(WordInfo.EMPTY_WORD_INFO),
new NgramContext(WordInfo.EMPTY_WORD_INFO));
}
@Test
public void testIsBeginningOfSentenceContext() {
assertFalse(new NgramContext().isBeginningOfSentenceContext());
assertTrue(new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO)
.isBeginningOfSentenceContext());
assertTrue(NgramContext.BEGINNING_OF_SENTENCE.isBeginningOfSentenceContext());
assertFalse(new NgramContext(new WordInfo("a")).isBeginningOfSentenceContext());
assertFalse(new NgramContext(new WordInfo("")).isBeginningOfSentenceContext());
assertFalse(new NgramContext(WordInfo.EMPTY_WORD_INFO).isBeginningOfSentenceContext());
assertTrue(new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO, new WordInfo("a"))
.isBeginningOfSentenceContext());
assertFalse(new NgramContext(new WordInfo("a"), WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO)
.isBeginningOfSentenceContext());
assertFalse(new NgramContext(
WordInfo.EMPTY_WORD_INFO, WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO)
.isBeginningOfSentenceContext());
}
@Test
public void testGetNextNgramContext() {
final NgramContext ngramContext_a = new NgramContext(new WordInfo("a"));
final NgramContext ngramContext_b_a =
ngramContext_a.getNextNgramContext(new WordInfo("b"));
assertEquals("b", ngramContext_b_a.getNthPrevWord(1));
assertEquals("a", ngramContext_b_a.getNthPrevWord(2));
final NgramContext ngramContext_bos_b =
ngramContext_b_a.getNextNgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO);
assertTrue(ngramContext_bos_b.isBeginningOfSentenceContext());
assertEquals("b", ngramContext_bos_b.getNthPrevWord(2));
final NgramContext ngramContext_c_bos =
ngramContext_b_a.getNextNgramContext(new WordInfo("c"));
assertEquals("c", ngramContext_c_bos.getNthPrevWord(1));
}
@Test
public void testExtractPrevWordsContextTest() {
final NgramContext ngramContext_bos =
new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO);
assertEquals("<S>", ngramContext_bos.extractPrevWordsContext());
final NgramContext ngramContext_a = new NgramContext(new WordInfo("a"));
final NgramContext ngramContext_b_a =
ngramContext_a.getNextNgramContext(new WordInfo("b"));
assertEquals("b", ngramContext_b_a.getNthPrevWord(1));
assertEquals("a", ngramContext_b_a.getNthPrevWord(2));
assertEquals("a b", ngramContext_b_a.extractPrevWordsContext());
final NgramContext ngramContext_bos_b =
ngramContext_b_a.getNextNgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO);
assertTrue(ngramContext_bos_b.isBeginningOfSentenceContext());
assertEquals("b", ngramContext_bos_b.getNthPrevWord(2));
assertEquals("a b <S>", ngramContext_bos_b.extractPrevWordsContext());
final NgramContext ngramContext_empty = new NgramContext(WordInfo.EMPTY_WORD_INFO);
assertEquals("", ngramContext_empty.extractPrevWordsContext());
final NgramContext ngramContext_a_empty =
ngramContext_empty.getNextNgramContext(new WordInfo("a"));
assertEquals("a", ngramContext_a_empty.getNthPrevWord(1));
assertEquals("a", ngramContext_a_empty.extractPrevWordsContext());
}
@Test
public void testExtractPrevWordsContextArray() {
final NgramContext ngramContext_bos =
new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO);
assertEquals("<S>", ngramContext_bos.extractPrevWordsContext());
assertEquals(1, ngramContext_bos.extractPrevWordsContextArray().length);
final NgramContext ngramContext_a = new NgramContext(new WordInfo("a"));
final NgramContext ngramContext_b_a =
ngramContext_a.getNextNgramContext(new WordInfo("b"));
assertEquals(2, ngramContext_b_a.extractPrevWordsContextArray().length);
assertEquals("b", ngramContext_b_a.getNthPrevWord(1));
assertEquals("a", ngramContext_b_a.getNthPrevWord(2));
assertEquals("a", ngramContext_b_a.extractPrevWordsContextArray()[0]);
assertEquals("b", ngramContext_b_a.extractPrevWordsContextArray()[1]);
final NgramContext ngramContext_bos_b =
ngramContext_b_a.getNextNgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO);
assertTrue(ngramContext_bos_b.isBeginningOfSentenceContext());
assertEquals(3, ngramContext_bos_b.extractPrevWordsContextArray().length);
assertEquals("b", ngramContext_bos_b.getNthPrevWord(2));
assertEquals("a", ngramContext_bos_b.extractPrevWordsContextArray()[0]);
assertEquals("b", ngramContext_bos_b.extractPrevWordsContextArray()[1]);
assertEquals("<S>", ngramContext_bos_b.extractPrevWordsContextArray()[2]);
final NgramContext ngramContext_empty = new NgramContext(WordInfo.EMPTY_WORD_INFO);
assertEquals(0, ngramContext_empty.extractPrevWordsContextArray().length);
final NgramContext ngramContext_a_empty =
ngramContext_empty.getNextNgramContext(new WordInfo("a"));
assertEquals(1, ngramContext_a_empty.extractPrevWordsContextArray().length);
assertEquals("a", ngramContext_a_empty.extractPrevWordsContextArray()[0]);
}
@Test
public void testGetNgramContextFromNthPreviousWord() {
SpacingAndPunctuations spacingAndPunctuations = new SpacingAndPunctuations(
InstrumentationRegistry.getTargetContext().getResources());
assertEquals("<S>", NgramContextUtils.getNgramContextFromNthPreviousWord("",
spacingAndPunctuations, 1).extractPrevWordsContext());
assertEquals("<S> b", NgramContextUtils.getNgramContextFromNthPreviousWord("a. b ",
spacingAndPunctuations, 1).extractPrevWordsContext());
assertEquals("<S> b", NgramContextUtils.getNgramContextFromNthPreviousWord("a? b ",
spacingAndPunctuations, 1).extractPrevWordsContext());
assertEquals("<S> b", NgramContextUtils.getNgramContextFromNthPreviousWord("a! b ",
spacingAndPunctuations, 1).extractPrevWordsContext());
assertEquals("<S> b", NgramContextUtils.getNgramContextFromNthPreviousWord("a\nb ",
spacingAndPunctuations, 1).extractPrevWordsContext());
assertEquals("<S> a b", NgramContextUtils.getNgramContextFromNthPreviousWord("a b ",
spacingAndPunctuations, 1).extractPrevWordsContext());
assertFalse(NgramContextUtils
.getNgramContextFromNthPreviousWord("a b c d e", spacingAndPunctuations, 1)
.extractPrevWordsContext().startsWith("<S>"));
}
}
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