MatrixToString.js

/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */

var Pad = require('../../string/Pad');
var CheckMatrix = require('./CheckMatrix');

/**
 * Generates a string (which you can pass to console.log) from the given Array Matrix.
 *
 * A matrix is a two-dimensional array (array of arrays), where all sub-arrays (rows)
 * have the same length. There must be at least two rows. This is an example matrix:
 *
 * ```
 * [
 *    [ 1, 1, 1, 1, 1, 1 ],
 *    [ 2, 0, 0, 0, 0, 4 ],
 *    [ 2, 0, 1, 2, 0, 4 ],
 *    [ 2, 0, 3, 4, 0, 4 ],
 *    [ 2, 0, 0, 0, 0, 4 ],
 *    [ 3, 3, 3, 3, 3, 3 ]
 * ]
 * ```
 *
 * @function Phaser.Utils.Array.Matrix.MatrixToString
 * @since 3.0.0
 *
 * @generic T
 * @genericUse {T[][]} - [matrix]
 *
 * @param {T[][]} [matrix] - A 2-dimensional array.
 *
 * @return {string} A string representing the matrix.
 */
var MatrixToString = function (matrix)
{
    var str = '';

    if (!CheckMatrix(matrix))
    {
        return str;
    }

    for (var r = 0; r < matrix.length; r++)
    {
        for (var c = 0; c < matrix[r].length; c++)
        {
            var cell = matrix[r][c].toString();

            if (cell !== 'undefined')
            {
                str += Pad(cell, 2);
            }
            else
            {
                str += '?';
            }

            if (c < matrix[r].length - 1)
            {
                str += ' |';
            }
        }

        if (r < matrix.length - 1)
        {
            str += '\n';

            for (var i = 0; i < matrix[r].length; i++)
            {
                str += '---';

                if (i < matrix[r].length - 1)
                {
                    str += '+';
                }
            }

            str += '\n';
        }

    }

    return str;
};

module.exports = MatrixToString;