alpha_filter.h

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#ifndef META_ALPHA_FILTER_H_
#define META_ALPHA_FILTER_H_

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

namespace meta
{
namespace analyzers
{
namespace filters
{

class alpha_filter : public util::clonable<token_stream, alpha_filter>
{
  public:
    alpha_filter(std::unique_ptr<token_stream> source);

    alpha_filter(const alpha_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> token_;
};
}
}
}
#endif