empty_sentence_filter.h

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#ifndef META_EMPTY_SENTENCE_FILTER_H_
#define META_EMPTY_SENTENCE_FILTER_H_

#include "analyzers/token_stream.h"
#include "util/clonable.h"
#include "util/optional.h"

namespace meta
{
namespace analyzers
{
namespace filters
{
class empty_sentence_filter
    : public util::clonable<token_stream, empty_sentence_filter>
{
  public:
    empty_sentence_filter(std::unique_ptr<token_stream> source);

    empty_sentence_filter(const empty_sentence_filter& other);

    void set_content(const std::string& content) override;

    std::string next() override;

    operator bool() const override;

    const static std::string id;

  private:
    void next_token();

    std::unique_ptr<token_stream> source_;

    util::optional<std::string> first_;

    util::optional<std::string> second_;
};
}
}
}
#endif