Follow up to I21b54b35

#define TWO_WORDS_CAPITALIZED_DEMOTION_RATE 50

#define TWO_WORDS_CORRECTION_DEMOTION_BASE 80

#define TWO_WORDS_PLUS_OTHER_ERROR_CORRECTION_DEMOTION_DIVIDER 1

#define ZERO_DISTANCE_PROMOTION_RATE 110

#define ZERO_DISTANCE_PROMOTION_RATE 110.0f

#define NEUTRAL_SCORE_SQUARED_RADIUS 8.0f

#define HALF_SCORE_SQUARED_RADIUS 32.0f

#define MAX_FREQ 255

#define LATINIME_SUGGEST_UTILS_H

#include "defines.h"

#include "proximity_info_state.h"

namespace latinime {

class SuggestUtils {

 public:

    static float getDistanceScalingFactor(float normalizedSquaredDistance) {

    static float getDistanceScalingFactor(const float normalizedSquaredDistance) {

        if (normalizedSquaredDistance < 0.0f) {

            return -1.0f;

        }

        static const float MIN = 0.3f;

        static const float R1 = NEUTRAL_SCORE_SQUARED_RADIUS;

        static const float R2 = HALF_SCORE_SQUARED_RADIUS;

        const float x = static_cast<float>(normalizedSquaredDistance)

                / ProximityInfoState::NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR;

        const float x = normalizedSquaredDistance / static_cast<float>(

                ProximityInfoState::NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR);

        const float factor = max((x < R1)

                ? (A * (R1 - x) + B * x) / R1

                : (B * (R2 - x) + C * (x - R1)) / (R2 - R1), MIN);

        // 0   R1 R2             .

        return factor;

    }

 private:

    DISALLOW_IMPLICIT_CONSTRUCTORS(SuggestUtils);

};

} // namespace latinime

#endif // LATINIME_SUGGEST_UTILS_H