content: package net.sf.expectit.matcher;
  
  /*
   * #%L
   * ExpectIt
   * %%
   * Copyright (C) 2014 Alexey Gavrilov and contributors
   * %%
   * 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.
   * #L%
   */
  
  import static net.sf.expectit.matcher.Matchers.generateToString;
  
  import java.util.regex.Pattern;
  import net.sf.expectit.Result;
  
  /**
   * A result type that represents the match of a regular expression based on {@link java.util
   * .regex.Matcher}.
   *
   * @author Alexey Gavrilov
   */
  class RegexpMatcher implements Matcher<Result> {
      private final Pattern pattern;
      private final boolean useFind;
  
      /**
       * The constructor.
       *
       * @param pattern the pattern
       * @param useFind when <tt>true</tt> the {@link java.util.regex.Matcher#find()} method is
       *                used to create a result,
       *                otherwise the {@link java.util.regex.Matcher#matches()} method is used.
       */
      public RegexpMatcher(Pattern pattern, boolean useFind) {
          this.pattern = pattern;
          this.useFind = useFind;
      }
  
      @Override
      public Result matches(String input, boolean isEof) {
          java.util.regex.Matcher matcher = pattern.matcher(input);
          boolean result;
          if (useFind) {
              result = matcher.find();
          } else {
              result = matcher.matches();
          }
          if (result) {
              return new RegexpResult(true, input, input.substring(0, matcher.start()), matcher);
          } else {
              return SimpleResult.failure(input, false);
          }
      }
  
      @Override
      public String toString() {
          if (useFind) {
              return generateToString("regexp", pattern);
          }
          return generateToString("matches", pattern);
      }
  }
  