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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.language.process;
import com.yahoo.language.Language;
import com.yahoo.language.simple.SimpleTokenizer;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import static com.yahoo.language.LinguisticsCase.toLowerCase;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* Test of tokenization, with stemming and accent removal
*
* @author Mathias Mølster Lidal
*/
public class TokenizationTestCase {
private final Tokenizer tokenizer = new SimpleTokenizer();
@Test
public void testTokenizer() {
assertTokenize("This is a test, 123",
Arrays.asList("this", "is", "a", "test", "123"),
Arrays.asList("This", " ", "is", " ", "a", " ", "test", ",", " ", "123"));
}
@Test
public void testUnderScoreTokenization() {
assertTokenize("ugcapi_1", Language.ENGLISH, StemMode.SHORTEST, true, Arrays.asList("ugcapi", "1"), null);
}
@Test
public void testPhrasesWithPunctuation() {
assertTokenize("PHY_101.html a space/time or space-time course", Language.ENGLISH, StemMode.NONE,
false,
Arrays.asList("phy", "101", "html", "a", "space", "time", "or", "space", "time", "course"),
null);
assertTokenize("PHY_101.", Language.ENGLISH, StemMode.NONE, false, Arrays.asList("phy", "101"), null);
assertTokenize("101.3", Language.ENGLISH, StemMode.NONE, false, Arrays.asList("101", "3"), null);
}
@Test
public void testDoubleWidthTokenization() {
// "sony"
assertTokenize("\uFF53\uFF4F\uFF4E\uFF59", Language.ENGLISH, StemMode.NONE, false,
List.of("sony"), null);
assertTokenize("\uFF53\uFF4F\uFF4E\uFF59", Language.ENGLISH, StemMode.SHORTEST, false,
List.of("sony"), null);
// "SONY"
assertTokenize("\uFF33\uFF2F\uFF2E\uFF39", Language.ENGLISH, StemMode.NONE, false,
List.of("sony"), null);
assertTokenize("\uFF33\uFF2F\uFF2E\uFF39", Language.ENGLISH, StemMode.SHORTEST, false,
List.of("sony"), null);
// "on"
assertTokenize("\uFF4F\uFF4E", Language.ENGLISH, StemMode.NONE, false,
List.of("on"), null);
assertTokenize("\uFF4F\uFF4E", Language.ENGLISH, StemMode.SHORTEST, false,
List.of("on"), null);
// "ON"
assertTokenize("\uFF2F\uFF2E", Language.ENGLISH, StemMode.NONE, false,
List.of("on"), null);
assertTokenize("\uFF2F\uFF2E", Language.ENGLISH, StemMode.SHORTEST, false,
List.of("on"), null);
}
@Test
public void testLargeTextTokenization() {
StringBuilder sb = new StringBuilder();
String s = "teststring ";
for (int i = 0; i < 100000; i++) {
sb.append(s);
}
String input = sb.toString();
int numTokens = 0;
List<Long> pos = new ArrayList<>();
for (Token t : tokenizer.tokenize(input, Language.ENGLISH, StemMode.NONE, false)) {
numTokens++;
if ((numTokens % 100) == 0) {
pos.add(t.getOffset());
}
}
assertEquals("Check that all tokens have been tokenized", numTokens, 200000);
assertTrue("Increasing token pos", assertMonoIncr(pos));
}
@Test
public void testLargeTokenGuard() {
StringBuilder str = new StringBuilder();
for (int i = 0; i < 128 * 256; i++) {
str.append("ab");
}
Iterator<Token> it = tokenizer.tokenize(str.toString(), Language.ENGLISH, StemMode.NONE, false).iterator();
assertTrue(it.hasNext());
assertNotNull(it.next().getTokenString());
assertFalse(it.hasNext());
}
@Test
public void testTokenIterator() {
Iterator<Token> it = tokenizer.tokenize("", Language.ENGLISH, StemMode.NONE, false).iterator();
assertFalse(it.hasNext());
try {
it.next();
fail();
} catch (NoSuchElementException e) {
// success
}
it = tokenizer.tokenize("", Language.ENGLISH, StemMode.NONE, false).iterator();
assertFalse(it.hasNext());
it = tokenizer.tokenize("one two three", Language.ENGLISH, StemMode.NONE, false).iterator();
assertNotNull(it.next());
assertNotNull(it.next());
assertNotNull(it.next());
assertNotNull(it.next());
assertNotNull(it.next());
assertFalse(it.hasNext());
}
@Test
public void testGetOffsetLength() {
String input = "Deka-Chef Weber r\u00e4umt Kommunikationsfehler ein";
long[] expOffset = { 0, 4, 5, 9, 10, 15, 16, 21, 22, 42, 43 };
int[] len = { 4, 1, 4, 1, 5, 1, 5, 1, 20, 1, 3 };
int idx = 0;
for (Token token : tokenizer.tokenize(input, Language.GERMAN, StemMode.SHORTEST, false)) {
assertEquals("Token offset for token #" + idx, expOffset[idx], token.getOffset());
assertEquals("Token len for token #" + idx, len[idx], token.getOrig().length());
idx++;
}
}
@Test
public void testRecursiveDecompose() {
for (Token t : tokenizer.tokenize("\u00a510%", Language.ENGLISH, StemMode.SHORTEST, false)) {
recurseDecompose(t);
}
}
@Test
public void testIndexability() {
String input = "tafsirnya\u0648\u0643\u064F\u0646\u0652";
for (StemMode stemMode : new StemMode[] { StemMode.NONE,
StemMode.SHORTEST }) {
for (Language l : new Language[] { Language.INDONESIAN,
Language.ENGLISH, Language.ARABIC }) {
for (boolean accentDrop : new boolean[] { true, false }) {
for (Token token : tokenizer.tokenize(input,
l, stemMode, accentDrop)) {
if (token.getTokenString().length() == 0) {
assertFalse(token.isIndexable());
}
}
}
}
}
}
private void recurseDecompose(Token t) {
assertTrue(t.getOffset() >= 0);
assertTrue(t.getOrig().length() >= 0);
int numComp = t.getNumComponents();
for (int i = 0; i < numComp; i++) {
Token comp = t.getComponent(i);
recurseDecompose(comp);
}
}
private boolean assertMonoIncr(Iterable<Long> n) {
long trailing = -1;
for (long i : n) {
if (i < trailing) {
return false;
}
trailing = i;
}
return true;
}
private void assertTokenize(String input, List<String> indexed, List<String> orig) {
assertTokenize(input, Language.ENGLISH, StemMode.NONE, false, indexed, orig);
}
/**
* <p>Compare the results of running an input string through the tokenizer with an "index" truth, and an optional
* "orig" truth.</p>
*
* @param input The text to process, passed to tokenizer.
* @param language The language tag, passed to tokenizer.
* @param stemMode If stemMode != NONE, test will silently succeed if tokenizer does not do stemming.
* @param accentDrop Passed to the tokenizer.
* @param indexed Compared to the "TokenString" result from the tokenizer.
* @param orig Compared to the "Orig" result from the tokenizer.
*/
private void assertTokenize(String input, Language language, StemMode stemMode, boolean accentDrop,
List<String> indexed, List<String> orig) {
int i = 0;
int j = 0;
for (Token token : tokenizer.tokenize(input, language, stemMode, accentDrop)) {
// System.err.println("got token orig '"+token.getOrig()+"'");
// System.err.println("got token stem '"+token.getTokenString(stemMode)+"'");
if (token.getNumComponents() > 0) {
for (int comp = 0; comp < token.getNumComponents(); comp++) {
Token t = token.getComponent(comp);
if (t.getType().isIndexable()) {
assertEquals("comp index: " + i, indexed.get(i++), toLowerCase(t.getTokenString()));
}
}
} else {
if (token.getType().isIndexable()) {
assertEquals("exp index: " + i, indexed.get(i++), toLowerCase(token.getTokenString()));
}
}
if (orig != null) {
assertEquals("orig index: " + j, orig.get(j++), token.getOrig());
}
}
assertEquals("indexed length", indexed.size(), i);
if (orig != null) {
assertEquals("orig length", orig.size(), j);
}
}
}
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