content: /*
   *  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
   *
   *      https://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.tools.ant.util.regexp;
  
  import java.util.Vector;
  
  import org.apache.oro.text.regex.MatchResult;
  import org.apache.oro.text.regex.Pattern;
  import org.apache.oro.text.regex.Perl5Compiler;
  import org.apache.oro.text.regex.Perl5Matcher;
  import org.apache.tools.ant.BuildException;
  
  
  /**
   * Implementation of RegexpMatcher for Jakarta-ORO.
   *
   */
  public class JakartaOroMatcher implements RegexpMatcher {
  
      private String pattern;
      // CheckStyle:VisibilityModifier OFF - bc
      protected final Perl5Compiler compiler = new Perl5Compiler();
      protected final Perl5Matcher matcher = new Perl5Matcher();
      // CheckStyle:VisibilityModifier ON
  
      /**
       * Set the regexp pattern from the String description.
       * @param pattern the pattern to match
       */
      @Override
      public void setPattern(final String pattern) {
          this.pattern = pattern;
      }
  
      /**
       * Get a String representation of the regexp pattern
       * @return the pattern
       */
      @Override
      public String getPattern() {
          return this.pattern;
      }
  
      /**
       * Get a compiled representation of the regexp pattern
       * @param options the options
       * @return the compiled pattern
       * @throws BuildException on error
       */
      protected Pattern getCompiledPattern(final int options)
          throws BuildException {
          try {
              // compute the compiler options based on the input options first
              return compiler.compile(pattern, getCompilerOptions(options));
          } catch (final Exception e) {
              throw new BuildException(e);
          }
      }
  
      /**
       * Does the given argument match the pattern using default options?
       * @param argument the string to match against
       * @return true if the pattern matches
       * @throws BuildException on error
       */
      @Override
      public boolean matches(final String argument) throws BuildException {
          return matches(argument, MATCH_DEFAULT);
      }
  
      /**
       * Does the given argument match the pattern?
       * @param input the string to match against
       * @param options the regex options to use
       * @return true if the pattern matches
       * @throws BuildException on error
       */
      @Override
      public boolean matches(final String input, final int options)
          throws BuildException {
          return matcher.contains(input, getCompiledPattern(options));
      }
  
      /**
       * Returns a Vector of matched groups found in the argument
       * using default options.
       *
       * <p>Group 0 will be the full match, the rest are the
       * parenthesized subexpressions</p>.
       *
       * @param argument the string to match against
       * @return the vector of groups
       * @throws BuildException on error
       */
      @Override
      public Vector<String> getGroups(final String argument) throws BuildException {
          return getGroups(argument, MATCH_DEFAULT);
      }
  
      /**
       * Returns a Vector of matched groups found in the argument.
       *
       * <p>Group 0 will be the full match, the rest are the
       * parenthesized subexpressions</p>.
       *
       * @param input the string to match against
       * @param options the regex options to use
       * @return the vector of groups
       * @throws BuildException on error
       */
      @Override
      public Vector<String> getGroups(final String input, final int options)
          throws BuildException {
          if (!matches(input, options)) {
              return null;
          }
          final Vector<String> v = new Vector<>();
          final MatchResult mr = matcher.getMatch();
          final int cnt = mr.groups();
          for (int i = 0; i < cnt; i++) {
              String match = mr.group(i);
              // treat non-matching groups as empty matches
              if (match == null) {
                  match = "";
              }
              v.add(match);
          }
          return v;
      }
  
      /**
       * Convert the generic options to the regex compiler specific options.
       * @param options the generic options
       * @return the specific options
       */
      protected int getCompilerOptions(final int options) {
          int cOptions = Perl5Compiler.DEFAULT_MASK;
  
          if (RegexpUtil.hasFlag(options, MATCH_CASE_INSENSITIVE)) {
              cOptions |= Perl5Compiler.CASE_INSENSITIVE_MASK;
          }
          if (RegexpUtil.hasFlag(options, MATCH_MULTILINE)) {
              cOptions |= Perl5Compiler.MULTILINE_MASK;
          }
          if (RegexpUtil.hasFlag(options, MATCH_SINGLELINE)) {
              cOptions |= Perl5Compiler.SINGLELINE_MASK;
          }
  
          return cOptions;
      }
  
  }
  