Merge "Add util method in ngramcontext for context array" (148aab12) · Commits · e / os / android_packages_inputmethods_LatinIME

java/src/com/android/inputmethod/latin/NgramContext.java

+26 −0

Original line number	Diff line number	Diff line
		@@ -146,6 +146,32 @@ public class NgramContext {
		: TextUtils.join(CONTEXT_SEPARATOR, terms);
		}

		/**
		* Extracts the previous words context.
		*
		* @return a String array with the previous words.
		*/
		public String[] extractPrevWordsContextArray() {
		final ArrayList<String> prevTermList = new ArrayList<>();
		for (int i = mPrevWordsInfo.length - 1; i >= 0; --i) {
		if (mPrevWordsInfo[i] != null && mPrevWordsInfo[i].isValid()) {
		final NgramContext.WordInfo wordInfo = mPrevWordsInfo[i];
		if (wordInfo.mIsBeginningOfSentence) {
		prevTermList.add(BEGINNING_OF_SENTENCE_TAG);
		} else {
		final String term = wordInfo.mWord.toString();
		if (!term.isEmpty()) {
		prevTermList.add(term);
		}
		}
		}
		}
		final String[] contextStringArray = prevTermList.size() == 0 ?
		new String[] { BEGINNING_OF_SENTENCE_TAG }
		: prevTermList.toArray(new String[prevTermList.size()]);
		return contextStringArray;
		}

		public boolean isValid() {
		return mPrevWordsCount > 0 && mPrevWordsInfo[0].isValid();
		}

tests/src/com/android/inputmethod/latin/NgramContextTests.java

+39 −0

Original line number	Diff line number	Diff line
		@@ -64,4 +64,43 @@ public class NgramContextTests extends AndroidTestCase {
		ngramContext_b_a.getNextNgramContext(new WordInfo("c"));
		assertEquals("c", ngramContext_c_bos.getNthPrevWord(1));
		}

		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());
		}

		public void testExtractPrevWordsContextArray() {
		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", 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("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]);
		}
		}