Method readEscape

java/src/org/openqa/selenium/json/JsonInput.java:603–652

(StringBuilder builder)

   */
  // FIXME: This function doesn't appear to support UTF-8 or UTF-32.
  private void readEscape(StringBuilder builder) {
    char read = input.read();

    // List from: https://tools.ietf.org/html/rfc7159.html#section-7
    switch (read) {
      case 'b':
        builder.append("\b");
        break;

      case 'f':
        builder.append("\f");
        break;

      case 'n':
        builder.append("\n");
        break;

      case 'r':
        builder.append("\r");
        break;

      case 't':
        builder.append("\t");
        break;

      case 'u': // Unicode digit. The next four characters count.
        int result = 0;
        int multiplier = 4096; // (16 * 16 * 16) as we start from the thousands and work to units.
        for (int i = 0; i < 4; i++) {
          char c = input.read();
          int digit = Character.digit(c, 16);
          if (digit == -1) {
            throw new JsonException(c + " is not a hexadecimal digit. " + input);
          }
          result += digit * multiplier;
          multiplier /= 16;
        }
        builder.append((char) result);
        break;

      case '/':
      case '\\':
      case '"':
        builder.append(read);
        break;

      default:
        throw new JsonException("Unexpected escape code: " + read + ". " + input);
    }
  }

  /**
   * Consume whitespace characters from the head of the specified input object.