gazeplotter/dist/class/Eye/EyeSplitter/EyeSplitter.js

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

/**
 * Splits a string chunks produced by EyeParser into rows and columns.
 *
 * It can happen that a row is split into multiple chunks, so we need to
 * keep track of the last row and append the next chunk to it.
 */
export class EyeSplitter {
    rowDelimiter;
    lastRow = '';
    constructor(settings) {
        this.rowDelimiter = settings.rowDelimiter;
    }
    splitChunk(chunk) {
        const completeRows = (this.lastRow + chunk).split(this.rowDelimiter);
        const completeRowsLength = completeRows.length;
        if (completeRowsLength < 2) {
            this.lastRow += chunk;
            return [];
        }
        this.lastRow = completeRows[completeRowsLength - 1];
        return completeRows.slice(0, completeRowsLength - 1);
    }
    release() {
        const lastRow = this.lastRow + this.rowDelimiter;
        return lastRow.split(this.rowDelimiter);
    }
}