@iota-pico/data
Version:
IOTA Pico Framework Data Structures and Helpers
243 lines • 18.8 kB
JavaScript
Object.defineProperty(exports, "__esModule", { value: true });
const arrayHelper_1 = require("@iota-pico/core/dist/helpers/arrayHelper");
const numberHelper_1 = require("@iota-pico/core/dist/helpers/numberHelper");
const objectHelper_1 = require("@iota-pico/core/dist/helpers/objectHelper");
const dataError_1 = require("../error/dataError");
const trytes_1 = require("./trytes");
/**
* A class for handling trits.
*/
class Trits {
/* @internal */
constructor(trits) {
this._trits = trits;
}
/**
* Create instance of trits from Int8Array array.
* @param value Trytes used to create trits.
* @returns An instance of Trits.
*/
static fromArray(value) {
if (!objectHelper_1.ObjectHelper.isType(value, Int8Array)) {
throw new dataError_1.DataError("The value does not contain valid trits");
}
return new Trits(value);
}
/**
* Create instance of trits from number array.
* @param value Trytes used to create trits.
* @returns An instance of Trits.
*/
static fromNumberArray(value) {
if (!arrayHelper_1.ArrayHelper.isTyped(value, Number)) {
throw new dataError_1.DataError("The value does not contain valid trits");
}
return new Trits(new Int8Array(value));
}
/**
* Create instance of trits from trytes.
* @param value Trytes used to create trits.
* @returns An instance of Trits.
*/
static fromTrytes(value) {
if (!objectHelper_1.ObjectHelper.isType(value, trytes_1.Trytes)) {
throw new dataError_1.DataError("The value should be a valid Trytes object");
}
const trytesString = value.toString();
const trits = new Int8Array(trytesString.length * 3);
for (let i = 0; i < trytesString.length; i++) {
const idx = trytes_1.Trytes.ALPHABET.indexOf(trytesString.charAt(i));
trits[i * 3] = Trits.TRYTES_TRITS[idx][0];
trits[i * 3 + 1] = Trits.TRYTES_TRITS[idx][1];
trits[i * 3 + 2] = Trits.TRYTES_TRITS[idx][2];
}
return new Trits(trits);
}
/**
* Create instance of trits from number
* @param value Number used to create trits.
* @returns An instance of Trits.
*/
static fromNumber(value) {
if (!numberHelper_1.NumberHelper.isInteger(value)) {
throw new dataError_1.DataError("The value is not an integer");
}
const trits = [];
let absoluteValue = value < 0 ? -value : value;
while (absoluteValue > 0) {
let remainder = absoluteValue % 3;
absoluteValue = Math.floor(absoluteValue / 3);
if (remainder > 1) {
remainder = -1;
absoluteValue++;
}
trits[trits.length] = remainder;
}
if (value < 0) {
for (let i = 0; i < trits.length; i++) {
trits[i] = -trits[i];
}
}
return new Trits(new Int8Array(trits));
}
/**
* Add two trits together.
* @param first The first trit.
* @param second The second trit.
* @returns New trit which is the addition of the a + b.
*/
static add(first, second) {
if (!objectHelper_1.ObjectHelper.isType(first, Trits)) {
throw new dataError_1.DataError("The first should be a valid Trits object");
}
if (!objectHelper_1.ObjectHelper.isType(second, Trits)) {
throw new dataError_1.DataError("The seconds should be a valid Trits object");
}
const out = new Int8Array(Math.max(first._trits.length, second._trits.length));
let carry = 0;
let iA;
let iB;
for (let i = 0; i < out.length; i++) {
iA = i < first._trits.length ? first._trits[i] : 0;
iB = i < second._trits.length ? second._trits[i] : 0;
const fA = Trits.fullAdd(iA, iB, carry);
out[i] = fA[0];
carry = fA[1];
}
return Trits.fromArray(out);
}
/* @internal */
static fullAdd(a, b, c) {
const sA = Trits.sum(a, b);
const cA = Trits.cons(a, b);
const cB = Trits.cons(sA, c);
const cOut = Trits.any(cA, cB);
const sOUt = Trits.sum(sA, c);
return new Int8Array([sOUt, cOut]);
}
/* @internal */
static sum(a, b) {
const s = a + b;
switch (s) {
case 2: return -1;
case -2: return 1;
default: return s;
}
}
/* @internal */
static cons(a, b) {
if (a === b) {
return a;
}
return 0;
}
/* @internal */
static any(a, b) {
const s = a + b;
if (s > 0) {
return 1;
}
else if (s < 0) {
return -1;
}
return 0;
}
/**
* Get the value of the trits array.
* @returns Array representation of the trits.
*/
toArray() {
return this._trits;
}
/**
* Get the value of the trits array as a number array.
* @returns Array representation of the trits.
*/
toNumberArray() {
return Array.from(this._trits);
}
/**
* Get the trits as trytes.
* @returns Instance of Trytes.
*/
toTrytes() {
let trytes = "";
for (let i = 0; i < this._trits.length; i += 3) {
// Iterate over all possible tryte values to find correct trit representation
for (let j = 0; j < trytes_1.Trytes.ALPHABET.length; j++) {
if (Trits.TRYTES_TRITS[j][0] === this._trits[i] &&
Trits.TRYTES_TRITS[j][1] === this._trits[i + 1] &&
Trits.TRYTES_TRITS[j][2] === this._trits[i + 2]) {
trytes += trytes_1.Trytes.ALPHABET.charAt(j);
break;
}
}
}
return trytes_1.Trytes.fromString(trytes);
}
/**
* Get the trits as a number.
* @returns The trits converted to a number.
*/
toNumber() {
let returnValue = 0;
for (let i = this._trits.length - 1; i >= 0; i--) {
returnValue = returnValue * 3 + this._trits[i];
}
return returnValue;
}
/**
* What is the length of the trits.
* @returns Length of the trits.
*/
length() {
return this._trits.length;
}
/**
* Get a sub of the trits.
* @param start The start position to get the sub.
* @param length The length of the sub.
* @returns The trits sub.
*/
sub(start, length) {
if (!numberHelper_1.NumberHelper.isInteger(start) || start < 0) {
throw new dataError_1.DataError("The start must be a number >= 0");
}
if (!numberHelper_1.NumberHelper.isInteger(length) || (start + length) > this._trits.length) {
throw new dataError_1.DataError(`The start + length must <= ${this._trits.length}`);
}
return Trits.fromArray(this._trits.slice(start, start + length));
}
}
/* @internal */
Trits.TRYTES_TRITS = [
new Int8Array([0, 0, 0]),
new Int8Array([1, 0, 0]),
new Int8Array([-1, 1, 0]),
new Int8Array([0, 1, 0]),
new Int8Array([1, 1, 0]),
new Int8Array([-1, -1, 1]),
new Int8Array([0, -1, 1]),
new Int8Array([1, -1, 1]),
new Int8Array([-1, 0, 1]),
new Int8Array([0, 0, 1]),
new Int8Array([1, 0, 1]),
new Int8Array([-1, 1, 1]),
new Int8Array([0, 1, 1]),
new Int8Array([1, 1, 1]),
new Int8Array([-1, -1, -1]),
new Int8Array([0, -1, -1]),
new Int8Array([1, -1, -1]),
new Int8Array([-1, 0, -1]),
new Int8Array([0, 0, -1]),
new Int8Array([1, 0, -1]),
new Int8Array([-1, 1, -1]),
new Int8Array([0, 1, -1]),
new Int8Array([1, 1, -1]),
new Int8Array([-1, -1, 0]),
new Int8Array([0, -1, 0]),
new Int8Array([1, -1, 0]),
new Int8Array([-1, 0, 0])
];
exports.Trits = Trits;
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