AdventOfCode-js-2019/SpaceImageFormat/SpaceImageFormatLayer.js

module.exports = class SpaceImageFormatLayer {
    /**
     * A layer of a Space Image Format image
     *
     * @param {number} layerWidth The width of the layer
     * @param {number} layerHeight The height of the layer
     * @param {string} rawData The raw data for the layer
     */
    constructor(layerWidth, layerHeight, rawData) {
        /** The width of the layer */
        this.width = layerWidth;
        /** The height of the layer */
        this.height = layerHeight;
        /** The raw data of the layer */
        this._rawData = rawData;
        /** The rows of pixels in this layer */
        this.rows = this._parseLayerData(rawData);
    }

    /**
     * Parse the raw layer data into rows
     *
     * @param {string} rawData The raw layer data
     * @returns {array[]} The rows of pixels for the layer
     */
    _parseLayerData(rawData) {
        const rows = [];

        const rowSplit = new RegExp(`(\\d{${this.width}})`, "g");
        const tempRows = rawData.split(rowSplit).filter((r) => !!r);

        tempRows.forEach((row) => {
            rows.push(row.split("").map((pixel) => Number(pixel)));
        });

        return rows;
    }
};