package org.apache.lucene.analysis.util;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Locale;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LetterTokenizer;
import org.apache.lucene.analysis.core.LowerCaseTokenizer;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util._TestUtil;
/**
* Testcase for {@link CharTokenizer} subclasses
*/
public class TestCharTokenizers extends BaseTokenStreamTestCase {
/*
* test to read surrogate pairs without loosing the pairing
* if the surrogate pair is at the border of the internal IO buffer
*/
public void testReadSupplementaryChars() throws IOException {
StringBuilder builder = new StringBuilder();
// create random input
int num = 1024 + random().nextInt(1024);
num *= RANDOM_MULTIPLIER;
for (int i = 1; i < num; i++) {
builder.append("\ud801\udc1cabc");
if((i % 10) == 0)
builder.append(" ");
}
// internal buffer size is 1024 make sure we have a surrogate pair right at the border
builder.insert(1023, "\ud801\udc1c");
Tokenizer tokenizer = new LowerCaseTokenizer(TEST_VERSION_CURRENT, new StringReader(builder.toString()));
assertTokenStreamContents(tokenizer, builder.toString().toLowerCase(Locale.ROOT).split(" "));
}
/*
* test to extend the buffer TermAttribute buffer internally. If the internal
* alg that extends the size of the char array only extends by 1 char and the
* next char to be filled in is a supplementary codepoint (using 2 chars) an
* index out of bound exception is triggered.
*/
public void testExtendCharBuffer() throws IOException {
for (int i = 0; i < 40; i++) {
StringBuilder builder = new StringBuilder();
for (int j = 0; j < 1+i; j++) {
builder.append("a");
}
builder.append("\ud801\udc1cabc");
Tokenizer tokenizer = new LowerCaseTokenizer(TEST_VERSION_CURRENT, new StringReader(builder.toString()));
assertTokenStreamContents(tokenizer, new String[] {builder.toString().toLowerCase(Locale.ROOT)});
}
}
/*
* tests the max word length of 255 - tokenizer will split at the 255 char no matter what happens
*/
public void testMaxWordLength() throws IOException {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < 255; i++) {
builder.append("A");
}
Tokenizer tokenizer = new LowerCaseTokenizer(TEST_VERSION_CURRENT, new StringReader(builder.toString() + builder.toString()));
assertTokenStreamContents(tokenizer, new String[] {builder.toString().toLowerCase(Locale.ROOT), builder.toString().toLowerCase(Locale.ROOT)});
}
/*
* tests the max word length of 255 with a surrogate pair at position 255
*/
public void testMaxWordLengthWithSupplementary() throws IOException {
StringBuilder builder = new StringBuilder();
for (int i = 0; i < 254; i++) {
builder.append("A");
}
builder.append("\ud801\udc1c");
Tokenizer tokenizer = new LowerCaseTokenizer(TEST_VERSION_CURRENT, new StringReader(builder.toString() + builder.toString()));
assertTokenStreamContents(tokenizer, new String[] {builder.toString().toLowerCase(Locale.ROOT), builder.toString().toLowerCase(Locale.ROOT)});
}
// LUCENE-3642: normalize SMP->BMP and check that offsets are correct
public void testCrossPlaneNormalization() throws IOException {
Analyzer analyzer = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer tokenizer = new LetterTokenizer(TEST_VERSION_CURRENT, reader) {
@Override
protected int normalize(int c) {
if (c > 0xffff) {
return 'δ';
} else {
return c;
}
}
};
return new TokenStreamComponents(tokenizer, tokenizer);
}
};
int num = 1000 * RANDOM_MULTIPLIER;
for (int i = 0; i < num; i++) {
String s = _TestUtil.randomUnicodeString(random());
TokenStream ts = analyzer.tokenStream("foo", s);
try {
ts.reset();
OffsetAttribute offsetAtt = ts.addAttribute(OffsetAttribute.class);
while (ts.incrementToken()) {
String highlightedText = s.substring(offsetAtt.startOffset(), offsetAtt.endOffset());
for (int j = 0, cp = 0; j < highlightedText.length(); j += Character.charCount(cp)) {
cp = highlightedText.codePointAt(j);
assertTrue("non-letter:" + Integer.toHexString(cp), Character.isLetter(cp));
}
}
ts.end();
} finally {
IOUtils.closeWhileHandlingException(ts);
}
}
// just for fun
checkRandomData(random(), analyzer, num);
}
// LUCENE-3642: normalize BMP->SMP and check that offsets are correct
public void testCrossPlaneNormalization2() throws IOException {
Analyzer analyzer = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer tokenizer = new LetterTokenizer(TEST_VERSION_CURRENT, reader) {
@Override
protected int normalize(int c) {
if (c <= 0xffff) {
return 0x1043C;
} else {
return c;
}
}
};
return new TokenStreamComponents(tokenizer, tokenizer);
}
};
int num = 1000 * RANDOM_MULTIPLIER;
for (int i = 0; i < num; i++) {
String s = _TestUtil.randomUnicodeString(random());
TokenStream ts = analyzer.tokenStream("foo", s);
try {
ts.reset();
OffsetAttribute offsetAtt = ts.addAttribute(OffsetAttribute.class);
while (ts.incrementToken()) {
String highlightedText = s.substring(offsetAtt.startOffset(), offsetAtt.endOffset());
for (int j = 0, cp = 0; j < highlightedText.length(); j += Character.charCount(cp)) {
cp = highlightedText.codePointAt(j);
assertTrue("non-letter:" + Integer.toHexString(cp), Character.isLetter(cp));
}
}
ts.end();
} finally {
IOUtils.closeWhileHandlingException(ts);
}
}
// just for fun
checkRandomData(random(), analyzer, num);
}
}