lucene/analysis/common/src/test/org/apache/lucene/analysis/pattern/TestPatternReplaceCharFilterFactory.java

/*
 * 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.
 */
package org.apache.lucene.analysis.pattern;

import java.io.Reader;
import java.io.StringReader;
import org.apache.lucene.analysis.BaseTokenStreamFactoryTestCase;
import org.apache.lucene.analysis.TokenStream;

/** Simple tests to ensure this factory is working */
public class TestPatternReplaceCharFilterFactory extends BaseTokenStreamFactoryTestCase {

  //           1111
  // 01234567890123
  // this is test.
  public void testNothingChange() throws Exception {
    Reader reader = new StringReader("this is test.");
    reader =
        charFilterFactory(
                "PatternReplace", "pattern", "(aa)\\s+(bb)\\s+(cc)", "replacement", "$1$2$3")
            .create(reader);
    TokenStream ts = whitespaceMockTokenizer(reader);
    assertTokenStreamContents(
        ts, new String[] {"this", "is", "test."}, new int[] {0, 5, 8}, new int[] {4, 7, 13});
  }

  // 012345678
  // aa bb cc
  public void testReplaceByEmpty() throws Exception {
    Reader reader = new StringReader("aa bb cc");
    reader = charFilterFactory("PatternReplace", "pattern", "(aa)\\s+(bb)\\s+(cc)").create(reader);
    TokenStream ts = whitespaceMockTokenizer(reader);
    assertTokenStreamContents(ts, new String[] {});
  }

  // 012345678
  // aa bb cc
  // aa#bb#cc
  public void test1block1matchSameLength() throws Exception {
    Reader reader = new StringReader("aa bb cc");
    reader =
        charFilterFactory(
                "PatternReplace", "pattern", "(aa)\\s+(bb)\\s+(cc)", "replacement", "$1#$2#$3")
            .create(reader);
    TokenStream ts = whitespaceMockTokenizer(reader);
    assertTokenStreamContents(ts, new String[] {"aa#bb#cc"}, new int[] {0}, new int[] {8});
  }

  /** Test that bogus arguments result in exception */
  public void testBogusArguments() throws Exception {
    IllegalArgumentException expected =
        expectThrows(
            IllegalArgumentException.class,
            () -> {
              charFilterFactory("PatternReplace", "pattern", "something", "bogusArg", "bogusValue");
            });
    assertTrue(expected.getMessage().contains("Unknown parameters"));
  }

  /** Test with backslash unescape */
  public void testUnescape() throws Exception {
    Reader reader = new StringReader("aaa\\ bbb\\-ccc");
    reader =
        charFilterFactory("PatternReplace", "pattern", "\\\\(.)", "replacement", "$1")
            .create(reader);
    TokenStream ts = whitespaceMockTokenizer(reader);
    assertTokenStreamContents(
        ts, new String[] {"aaa", "bbb-ccc"}, new int[] {0, 5}, new int[] {3, 13});

    reader = new StringReader("a\\b\\0\\-c\\é\\ d");
    reader =
        charFilterFactory(
                "PatternReplace",
                "pattern",
                "\\\\([^\\p{IsAlphabetic}\\p{Digit}])",
                "replacement",
                "$1")
            .create(reader);
    ts = whitespaceMockTokenizer(reader);
    assertTokenStreamContents(
        ts, new String[] {"a\\b\\0-c\\é", "d"}, new int[] {0, 12}, new int[] {10, 13});
  }
}