gazeplotter/dist/class/Eye/EyeDeserializer/CsvEyeDeserializer.js

Gazeplotter is a Svelte application for visualizing eye-tracking data.

import { AbstractEyeDeserializer } from './AbstractEyeDeserializer.ts';
// BEWARE! If only one timestamp for whole segment, start and end are the same!
export class CsvEyeDeserializer extends AbstractEyeDeserializer {
    cTime;
    cParticipant;
    cStimulus;
    cAoi;
    mTimeStart = '';
    mTimeLast = '';
    mTimeBase = null;
    mAoi = null;
    mParticipant = 'CsvParticipant';
    mStimulus = 'CsvFile';
    constructor(header) {
        super();
        this.cTime = this.getIndex(header, 'Time');
        this.cAoi = this.getIndex(header, 'AOI');
        this.cParticipant = this.getIndex(header, 'Participant');
        this.cStimulus = this.getIndex(header, 'Stimulus');
    }
    deserialize(row) {
        const time = row[this.cTime];
        const aoi = row[this.cAoi];
        const participant = row[this.cParticipant];
        const stimulus = row[this.cStimulus];
        const isNewSegment = (aoi !== this.mAoi) || (participant !== this.mParticipant) || (stimulus !== this.mStimulus);
        const isNewTimebase = (this.mTimeBase === null) || (participant !== this.mParticipant) || (stimulus !== this.mStimulus);
        let output = null;
        if (this.mTimeBase === null)
            this.mTimeBase = Number(time);
        if (isNewSegment) {
            output = this.finalize();
            this.mTimeStart = time; // if a new segment starts, set the start time
            this.mAoi = aoi;
            this.mParticipant = participant;
            this.mStimulus = stimulus;
        }
        if (isNewTimebase)
            this.mTimeBase = Number(time);
        this.mTimeLast = time;
        return output;
    }
    finalize() {
        const baseTime = this.mTimeBase;
        if (baseTime === null)
            throw new Error('Base time is null');
        const aoi = this.mAoi;
        if (aoi === null)
            return null;
        return {
            aoi: aoi === '' ? null : [aoi],
            category: 'Fixation',
            start: String(Number(this.mTimeStart) - baseTime),
            end: String(Number(this.mTimeLast) - baseTime),
            participant: this.mParticipant,
            stimulus: this.mStimulus
        };
    }
}