icu_filter.h

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#ifndef META_ICU_FILTER_H_
#define META_ICU_FILTER_H_

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

namespace cpptoml
{
class table;
}

namespace meta
{
namespace analyzers
{
namespace filters
{

class icu_filter : public util::clonable<token_stream, icu_filter>
{
  public:
    icu_filter(std::unique_ptr<token_stream> source, const std::string& id);

    icu_filter(const icu_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_;

    utf::transformer trans_;

    util::optional<std::string> token_;
};

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