@hvm/vm/BasicInput.js

hvm internal package for virtual machine

const INPUT_MAP = {
    NL: 129,
    BS: 129,
    LEFT: 130,
    UP: 131,
    RIGHT: 132,
    DOWN: 133,
    HOME: 134,
    END: 135,
    PUP: 136,
    PDOWN: 137,
    INSERT: 138,
    DEL: 139,
    ESC: 140,
}

Array(12).fill(null).forEach((_, i) => {
    INPUT_MAP[`F${i}`] = 141  + i;
});

module.exports = class BasicInput {
    constructor(mapping = {}) {
        const keys = [];
        const keydown = e => keys.push(e.keyCode);
        const keyup = e => {
            let idx = 0;
            keys.some((code, i) => code === e.keyCode && (idx = i) && true);
            return idx || 0;
        };
        document.addEventListener("keydown", keydown);
        document.addEventListener("keyup", keyup);
        this.scan = () => (!keys.length ? 0 : keys[keys.length - 1]);
    }
}