export function imageLiteralToBitmap()

in share/src/sprite-editor/bitmap.ts [122:188]

• 52 lines of code
• 45 McCabe index (conditional complexity)

export function imageLiteralToBitmap(text: string, defaultPattern?: string): Bitmap {
    // Strip the tagged template string business and the whitespace. We don't have to exhaustively
    // replace encoded characters because the compiler will catch any disallowed characters and throw
    // an error before the decompilation happens. 96 is backtick and 9 is tab
    text = text.replace(/[ `]|(?:`)|(?:	)|(?:img)/g, "").trim();
    text = text.replace(/^["`\(\)]*/, '').replace(/["`\(\)]*$/, '');
    text = text.replace(/
/g, "\n");

    if (!text && defaultPattern)
        text = defaultPattern;

    const rows = text.split("\n");

    // We support "ragged" sprites so not all rows will be the same length
    const sprite: number[][] = [];
    let spriteWidth = 0;

    for (let r = 0; r < rows.length; r++) {
        const row = rows[r];
        const rowValues: number[] = [];
        for (let c = 0; c < row.length; c++) {
            // This list comes from libs/screen/targetOverrides.ts in pxt-arcade
            // Technically, this could change per target.
            switch (row[c]) {
                case "0": case ".": rowValues.push(0); break;
                case "1": case "#": rowValues.push(1); break;
                case "2": case "T": rowValues.push(2); break;
                case "3": case "t": rowValues.push(3); break;
                case "4": case "N": rowValues.push(4); break;
                case "5": case "n": rowValues.push(5); break;
                case "6": case "G": rowValues.push(6); break;
                case "7": case "g": rowValues.push(7); break;
                case "8": rowValues.push(8); break;
                case "9": rowValues.push(9); break;
                case "a": case "A": case "R": rowValues.push(10); break;
                case "b": case "B": case "P": rowValues.push(11); break;
                case "c": case "C": case "p": rowValues.push(12); break;
                case "d": case "D": case "O": rowValues.push(13); break;
                case "e": case "E": case "Y": rowValues.push(14); break;
                case "f": case "F": case "W": rowValues.push(15); break;
            }
        }

        if (rowValues.length) {
            sprite.push(rowValues);
            spriteWidth = Math.max(spriteWidth, rowValues.length);
        }
    }

    const spriteHeight = sprite.length;

    const result = new Bitmap(spriteWidth, spriteHeight)

    for (let r = 0; r < spriteHeight; r++) {
        const row = sprite[r];
        for (let c = 0; c < spriteWidth; c++) {
            if (c < row.length) {
                result.set(c, r, row[c]);
            }
            else {
                result.set(c, r, 0);
            }
        }
    }

    return result;
}