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"""Lempel-Ziv complexity module.
"""
__author__ = "Théo de la Hogue"
__credits__ = []
__copyright__ = "Copyright 2023, Ecole Nationale de l'Aviation Civile (ENAC)"
__license__ = "BSD"
from dataclasses import dataclass
from argaze import GazeFeatures, DataFeatures
from lempel_ziv_complexity import lempel_ziv_complexity
@dataclass
class AOIScanPathAnalyzer(GazeFeatures.AOIScanPathAnalyzer):
"""Implementation of Lempel-Ziv complexity algorithm as described in:
**Lounis C., Peysakhovich V., Causse M. (2020).**
*Lempel-Ziv Complexity of dwell sequences: visual scanning pattern differences between novice and expert aircraft pilots.*
Proceedings of the 1st International Workshop on Eye-Tracking in Aviation (ETAVI'20, 61-68).
[https://doi.org/10.3929/ethz-b-000407653](https://doi.org/10.3929/ethz-b-000407653)
"""
def __post_init__(self):
super().__init__()
self.__lempel_ziv_complexity = 0
@DataFeatures.PipelineStepMethod
def analyze(self, aoi_scan_path: GazeFeatures.AOIScanPathType):
assert(len(aoi_scan_path) > 1)
self.__lempel_ziv_complexity = lempel_ziv_complexity(aoi_scan_path.letter_sequence)
@property
def lempel_ziv_complexity(self) -> int:
"""Lempel-Ziv complexity."""
return self.__lempel_ziv_complexity
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