content: package ro.isdc.wro.util;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.CharEncoding;
  import org.apache.commons.lang3.Validate;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  
  /**
   * Used to overcome the limitation of {@link Properties} class when dealing with regular expressions read from
   * properties file. The main benefit of using {@link RegexpProperties} over simple {@link Properties} is that the regexp
   * doesn't have to be escaped.
   * 
   * @author Alex Objelean
   * @since 1.4.7
   * @created 11 Jun 2012
   */
  public class RegexpProperties {
    private static final Logger LOG = LoggerFactory.getLogger(RegexpProperties.class);
    private final Properties properties;
    private static final String REGEX_KEY_VALUE = "(?m)\\s*(.*?)\\s*=\\s*(.*)\\s*$";
    private static final String REGEX_COMMENTS = "#.*";
    private static final Pattern PATTERN_KEY_VALUE = Pattern.compile(REGEX_KEY_VALUE);
  
    public RegexpProperties() {
      this.properties = new Properties();
    }
    
    /**
     * Load the properties from the stream. The implementation will handle comments properly by removing them before
     * properties are loaded.
     * 
     * @param inputStream
     * @return {@link Properties} containing properties parsed from the stream.
     * @throws IOException
     */
    public Properties load(final InputStream inputStream) throws IOException {
      Validate.notNull(inputStream);
      final String rawContent = IOUtils.toString(inputStream, CharEncoding.UTF_8);
      parseProperties(rawContent.replaceAll(REGEX_COMMENTS, ""));
      return this.properties;
    }
  
    /**
     * parse the properties from the provided string containing a raw properties 
     */
    private void parseProperties(final String propertiesAsString) {
      //should work also \r?\n
      final String[] propertyEntries = propertiesAsString.split("\\r?\\n");
      for (final String entry : propertyEntries) {
        readPropertyEntry(entry);
      }
    }
  
    private void readPropertyEntry(final String entry) {
      Matcher matcher = PATTERN_KEY_VALUE.matcher(entry);
      while(matcher.find()) {
        final String key = matcher.group(1);
        final String value = matcher.group(2);
        this.properties.put(key, value);
      }
    }
  }
  