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 * Copyright (C) 2014 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_IMPORTS_HTML_IMPORT_STATE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_IMPORTS_HTML_IMPORT_STATE_H_

#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"

namespace blink {

class HTMLImportState final {
  DISALLOW_NEW();

 public:
  enum Value { kBlockingScriptExecution = 0, kActive, kReady, kInvalid };

  explicit HTMLImportState(Value value = kBlockingScriptExecution)
      : value_(value) {}

  bool ShouldBlockScriptExecution() const {
    return CheckedValue() <= kBlockingScriptExecution;
  }
  bool IsReady() const { return CheckedValue() == kReady; }
  bool IsValid() const { return value_ != kInvalid; }
  bool operator==(const HTMLImportState& other) const {
    return value_ == other.value_;
  }
  bool operator!=(const HTMLImportState& other) const {
    return !(*this == other);
  }
  bool operator<=(const HTMLImportState& other) const {
    return value_ <= other.value_;
  }

#if !defined(NDEBUG)
  Value PeekValueForDebug() const { return value_; }
#endif

  static HTMLImportState InvalidState() { return HTMLImportState(kInvalid); }
  static HTMLImportState BlockedState() {
    return HTMLImportState(kBlockingScriptExecution);
  }

 private:
  Value CheckedValue() const;
  Value value_;
};

inline HTMLImportState::Value HTMLImportState::CheckedValue() const {
  DCHECK(IsValid());
  return value_;
}

}  // namespace blink

#endif