text: /*
   * Copyright (C) 2019 Sony Interactive Entertainment Inc.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  #include "YarrFlags.h"
  
  #include <wtf/OptionSet.h>
  #include <wtf/Optional.h>
  #include <wtf/text/StringView.h>
  
  namespace JSC { namespace Yarr {
  
  Optional<OptionSet<Flags>> parseFlags(StringView string)
  {
      OptionSet<Flags> flags;
      for (auto character : string.codeUnits()) {
          switch (character) {
          case 'g':
              if (flags.contains(Flags::Global))
                  return WTF::nullopt;
              flags.add(Flags::Global);
              break;
  
          case 'i':
              if (flags.contains(Flags::IgnoreCase))
                  return WTF::nullopt;
              flags.add(Flags::IgnoreCase);
              break;
  
          case 'm':
              if (flags.contains(Flags::Multiline))
                  return WTF::nullopt;
              flags.add(Flags::Multiline);
              break;
  
          case 's':
              if (flags.contains(Flags::DotAll))
                  return WTF::nullopt;
              flags.add(Flags::DotAll);
              break;
              
          case 'u':
              if (flags.contains(Flags::Unicode))
                  return WTF::nullopt;
              flags.add(Flags::Unicode);
              break;
                  
          case 'y':
              if (flags.contains(Flags::Sticky))
                  return WTF::nullopt;
              flags.add(Flags::Sticky);
              break;
  
          default:
              return WTF::nullopt;
          }
      }
  
      return makeOptional(flags);
  }
  
  } } // namespace JSC::Yarr
  