weird rubik sim

qube.js

S = `

   UUU
   UUU
   UUU
LLLFFFRRRBBB
LLLFFFRRRBBB
LLLFFFRRRBBB
   DDD
   DDD
   DDD

`

I = 'UFRBLDxyz';
P = [6,3,0,7,4,1,8,5,2];
// moves
M = process.argv.slice(2).join('').split(/(\ww?\d?'?)/).filter(d=>d.trim());

// optional? remove whitespace
s = S.replace(/\s+/g,'')

U=_=>{
    s=P.map(d=>s[d]).join``+s[$='slice'](12,21)+s[$](9,12)+s[$](21)
}

x=_=>{
    s=[...'ÀÁÂÌÍÎØÙÚ¿Ë×áâãÛÏü»º¾ÊÖäåæÜП·½ÉÕçèéÝÑŶµ´àßÞÔÓÒÈÇÆ'].map(d=>s[d.charCodeAt()-180]).join``;
};

y=_=>{
    s=P.map(d=>s[d]).join``+[0,12,24].flatMap(_=>[[q=12+_,21+_],[9+_,q]]).map(d=>s.slice(...d)).join``+[...P].reverse().map(d=>s[d+45]).join``
};


z=_=>m[8];
m=[
    [U],
    [x,U,x,x,x],
    [y,y,y,x,x,x,U,x,y],
    [x,x,x,U,x],
    [z,U,z,z,z],
    [x,x,U,x,x],
    [x],
    [y],
    [x,y,x,x,x],
];

// execute moves
M.map(d=>{
    A=_=>m[I.indexOf(d[0])].map(d=>d());
    A();d[1]=="'"?(A(),A()):d[1]&&A();
});

// use mask to get output
i = 0; O = S.replace(/\S/g,_=>s[i++])

// colours
console.log(O.replace(/\S/g,_=>'\x1b['+[47,42,41,44,45,43][I.indexOf(_)]+'m'+_+'\x1b[0m'))