length_filter.h

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#ifndef META_LENGTH_FILTER_H_
#define META_LENGTH_FILTER_H_

#include <memory>

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

namespace cpptoml
{
class table;
}

namespace meta
{
namespace analyzers
{
namespace filters
{

class length_filter : public util::clonable<token_stream, length_filter>
{
  public:
    length_filter(std::unique_ptr<token_stream> source, uint64_t min,
                  uint64_t max);

    length_filter(const length_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_;

    uint64_t min_length_;

    uint64_t max_length_;
};

template <>
std::unique_ptr<token_stream>
    make_filter<length_filter>(std::unique_ptr<token_stream>,
                               const cpptoml::table&);
}
}
}
#endif