utf8iterator.h

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#ifndef ION_BASE_UTF8ITERATOR_H_
#define ION_BASE_UTF8ITERATOR_H_

#include <string>

#include "base/integral_types.h"

namespace ion {
namespace base {

class ION_API Utf8Iterator {
 public:
  enum State {
    kInString,     // Still iterating over characters.
    kEndOfString,  // Hit the end of the string.
    kInvalid,      // Hit an invalid UTF-8 sequence.
  };

  static const uint32 kInvalidCharIndex;

  explicit Utf8Iterator(const std::string& utf8_string);

  uint32 Next();

  State GetState() const { return state_; }

  size_t ComputeCharCount() const;

 private:
  uint8 GetNextByte();

  const std::string string_;
  const size_t byte_count_;
  size_t cur_index_;
  State state_;
};

}  // namespace base
}  // namespace ion

#endif  // ION_BASE_UTF8ITERATOR_H_