simple-pure-utils
Version:
Funciones puras para manipulación de objetos, arreglos, promesas y observables
126 lines • 11.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.maxDigit = exports.zeroPad = exports.maxValue = exports.minValue = exports.random = exports.toBaseN = exports.midpoint = exports.half = exports.increment = exports.add = exports.halfAdder = exports.createBase = void 0;
const logic_1 = require("../logic");
function createBase(digits) {
const arr = digits.split("");
return {
charMap: arr,
digitMap: (0, logic_1.arrayToMap)(arr, x => x, (x, i) => i)
};
}
exports.createBase = createBase;
function digitAt(a, index, system) {
if (index < 0)
return 0;
return system.digitMap[a.substr(index, 1)];
}
function toChar(digit, system) {
return system.charMap[digit];
}
function base(system) {
return system.charMap.length;
}
function zero(system) {
return system.charMap[0];
}
function one(system) {
return system.charMap[1];
}
function halfAdder(a, b, carry, system) {
if (a.length != 1 || b.length != 1)
throw new Error();
const ret = digitAt(a, 0, system) + digitAt(b, 0, system) + (carry ? 1 : 0);
if (ret >= base(system)) {
return {
carry: true,
ret: toChar(ret - base(system), system),
};
}
else {
return {
carry: false,
ret: toChar(ret, system),
};
}
}
exports.halfAdder = halfAdder;
/**Agrega dos numeros baseN, note que devuelve un numero con un digito de mas para que quepa toda la suma
* @param small No agregar un digito extra al resultado, puede ser que el resultado no quepa
*/
function add(a, b, system, small = false) {
var ret = new Array((a.length > b.length ? a.length : b.length) + (small ? 0 : 1));
let carry = false;
for (let i = ret.length - 1; i >= 0; i--) {
const aIndex = i - ret.length + a.length;
const bIndex = i - ret.length + b.length;
const aDigit = aIndex < 0 ? zero(system) : a.substr(aIndex, 1);
const bDigit = bIndex < 0 ? zero(system) : b.substr(bIndex, 1);
const half = halfAdder(aDigit, bDigit, carry, system);
ret[i] = half.ret;
carry = half.carry;
}
return ret.join("");
}
exports.add = add;
/**Incrementa en 1, note que no cambia el tamaño del numero */
function increment(a, system) {
return add(a, one(system), system, true);
}
exports.increment = increment;
function isEven(a, system) {
return digitAt(a, a.length - 1, system) % 2 == 0;
}
function half(a, system) {
if (base(system) % 2 != 0)
throw new Error("Only even base supported");
let ret = new Array(a.length);
for (let i = -1; i < a.length - 1; i++) {
const first = digitAt(a, i, system);
const second = digitAt(a, i + 1, system);
const fEven = first % 2 == 0;
const num = Math.floor(second / 2) + (fEven ? 0 : base(system) / 2);
ret[i + 1] = toChar(num, system);
}
return ret.join("");
}
exports.half = half;
function midpoint(a, b, system) {
return half(add(a, b, system), system).substr(1); //Le quita el digito extra que agrego el add
}
exports.midpoint = midpoint;
function toBaseN(n, size, system) {
let ret = new Array(size);
for (let i = (size - 1); i >= 0; i--) {
ret[i] = toChar(n % base(system), system);
// NOTE: Can't use << here because javascript will convert to int and lose the upper bits.
n = Math.floor(n / base(system));
}
return ret.join("");
}
exports.toBaseN = toBaseN;
function random(size, system) {
let ret = new Array(size);
for (let i = 0; i < size; i++) {
ret[i] = toChar(Math.floor(Math.random() * base(system)), system);
}
return ret.join("");
}
exports.random = random;
function minValue(size, system) {
return system.charMap[0].repeat(size);
}
exports.minValue = minValue;
function maxValue(size, system) {
return system.charMap[system.charMap.length - 1].repeat(size);
}
exports.maxValue = maxValue;
function zeroPad(num, size, system) {
return zero(system).repeat(size - num.length) + num;
}
exports.zeroPad = zeroPad;
function maxDigit(system) {
return system.charMap[system.charMap.length - 1];
}
exports.maxDigit = maxDigit;
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