private static String extractRoot()

in src/org/jetbrains/jps/runConf/java/ClasspathUtil.java [51:92]
35 lines of code
12 McCabe index (conditional complexity)

  private static String extractRoot(URL resourceURL, String resourcePath) {
    if (!(resourcePath.startsWith("/") || resourcePath.startsWith("\\"))) {
      //noinspection HardCodedStringLiteral
      System.err.println("precondition failed");
      return null;
    }
    String protocol = resourceURL.getProtocol();
    String resultPath = null;

    if (FILE.equals(protocol)) {
      String path = resourceURL.getFile();
      String testPath = path.replace('\\', '/').toLowerCase();
      String testResourcePath = resourcePath.replace('\\', '/').toLowerCase();
      if (testPath.endsWith(testResourcePath)) {
        resultPath = path.substring(0, path.length() - resourcePath.length());
      }
    }
    else if (JAR.equals(protocol)) {
      String fullPath = resourceURL.getFile();
      int delimiter = fullPath.indexOf(JAR_DELIMITER);
      if (delimiter >= 0) {
        String archivePath = fullPath.substring(0, delimiter);
        if (archivePath.startsWith(FILE + PROTOCOL_DELIMITER)) {
          resultPath = archivePath.substring(FILE.length() + PROTOCOL_DELIMITER.length());
        }
      }
    }

    if (resultPath != null && resultPath.endsWith(File.separator)) {
      resultPath = resultPath.substring(0, resultPath.length() - 1);
    }

    resultPath = replaceAll(resultPath, "%20", " ");
    resultPath = replaceAll(resultPath, "%23", "#");

    // !Workaround for /D:/some/path/a.jar, which doesn't work if D is subst disk
    if (resultPath.startsWith("/") && resultPath.indexOf(":") == 2) {
      resultPath = resultPath.substring(1);
    }

    return resultPath;
  }