312 lines
8.5 KiB
TypeScript
312 lines
8.5 KiB
TypeScript
"use strict";
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/**
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* BigNumber
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*
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* A wrapper around the BN.js object. We use the BN.js library
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* because it is used by elliptic, so it is required regardles.
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*
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*/
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import { BN } from "bn.js";
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import { Bytes, Hexable, hexlify, isBytes, isHexString } from "@ethersproject/bytes";
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import { Logger } from "@ethersproject/logger";
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import { version } from "./_version";
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const logger = new Logger(version);
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const _constructorGuard = { };
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const MAX_SAFE = 0x1fffffffffffff;
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export type BigNumberish = BigNumber | Bytes | string | number;
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export function isBigNumberish(value: any): value is BigNumberish {
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return (value != null) && (
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BigNumber.isBigNumber(value) ||
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(typeof(value) === "number" && (value % 1) === 0) ||
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(typeof(value) === "string" && !!value.match(/^-?[0-9]+$/)) ||
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isHexString(value) ||
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(typeof(value) === "bigint") ||
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isBytes(value)
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);
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}
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export class BigNumber implements Hexable {
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readonly _hex: string;
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readonly _isBigNumber: boolean;
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constructor(constructorGuard: any, hex: string) {
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logger.checkNew(new.target, BigNumber);
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if (constructorGuard !== _constructorGuard) {
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logger.throwError("cannot call constructor directly; use BigNumber.from", Logger.errors.UNSUPPORTED_OPERATION, {
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operation: "new (BigNumber)"
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});
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}
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this._hex = hex;
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this._isBigNumber = true;
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Object.freeze(this);
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}
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fromTwos(value: number): BigNumber {
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return toBigNumber(toBN(this).fromTwos(value));
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}
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toTwos(value: number): BigNumber {
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return toBigNumber(toBN(this).toTwos(value));
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}
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abs(): BigNumber {
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if (this._hex[0] === "-") {
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return BigNumber.from(this._hex.substring(1));
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}
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return this;
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}
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add(other: BigNumberish): BigNumber {
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return toBigNumber(toBN(this).add(toBN(other)));
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}
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sub(other: BigNumberish): BigNumber {
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return toBigNumber(toBN(this).sub(toBN(other)));
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}
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div(other: BigNumberish): BigNumber {
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const o = BigNumber.from(other);
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if (o.isZero()) {
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throwFault("division by zero", "div");
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}
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return toBigNumber(toBN(this).div(toBN(other)));
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}
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mul(other: BigNumberish): BigNumber {
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return toBigNumber(toBN(this).mul(toBN(other)));
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}
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mod(other: BigNumberish): BigNumber {
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const value = toBN(other);
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if (value.isNeg()) {
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throwFault("cannot modulo negative values", "mod");
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}
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return toBigNumber(toBN(this).umod(value));
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}
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pow(other: BigNumberish): BigNumber {
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return toBigNumber(toBN(this).pow(toBN(other)));
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}
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and(other: BigNumberish): BigNumber {
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const value = toBN(other);
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if (this.isNegative() || value.isNeg()) {
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throwFault("cannot 'and' negative values", "and");
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}
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return toBigNumber(toBN(this).and(value));
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}
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or(other: BigNumberish): BigNumber {
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const value = toBN(other);
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if (this.isNegative() || value.isNeg()) {
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throwFault("cannot 'or' negative values", "or");
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}
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return toBigNumber(toBN(this).or(value));
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}
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xor(other: BigNumberish): BigNumber {
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const value = toBN(other);
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if (this.isNegative() || value.isNeg()) {
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throwFault("cannot 'xor' negative values", "xor");
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}
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return toBigNumber(toBN(this).xor(value));
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}
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mask(value: number): BigNumber {
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if (this.isNegative() || value < 0) {
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throwFault("cannot mask negative values", "mask");
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}
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return toBigNumber(toBN(this).maskn(value));
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}
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shl(value: number): BigNumber {
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if (this.isNegative() || value < 0) {
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throwFault("cannot shift negative values", "shl");
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}
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return toBigNumber(toBN(this).shln(value));
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}
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shr(value: number): BigNumber {
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if (this.isNegative() || value < 0) {
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throwFault("cannot shift negative values", "shr");
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}
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return toBigNumber(toBN(this).shrn(value));
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}
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eq(other: BigNumberish): boolean {
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return toBN(this).eq(toBN(other));
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}
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lt(other: BigNumberish): boolean {
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return toBN(this).lt(toBN(other));
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}
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lte(other: BigNumberish): boolean {
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return toBN(this).lte(toBN(other));
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}
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gt(other: BigNumberish): boolean {
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return toBN(this).gt(toBN(other));
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}
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gte(other: BigNumberish): boolean {
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return toBN(this).gte(toBN(other));
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}
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isNegative(): boolean {
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return (this._hex[0] === "-");
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}
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isZero(): boolean {
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return toBN(this).isZero();
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}
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toNumber(): number {
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try {
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return toBN(this).toNumber();
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} catch (error) {
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throwFault("overflow", "toNumber", this.toString());
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}
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return null;
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}
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toString(): string {
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// Lots of people expect this, which we do not support, so check
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if (arguments.length !== 0) {
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logger.throwError("bigNumber.toString does not accept parameters", Logger.errors.UNEXPECTED_ARGUMENT, { });
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}
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return toBN(this).toString(10);
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}
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toHexString(): string {
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return this._hex;
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}
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static from(value: any): BigNumber {
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if (value instanceof BigNumber) { return value; }
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if (typeof(value) === "string") {
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if (value.match(/-?0x[0-9a-f]+/i)) {
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return new BigNumber(_constructorGuard, toHex(value));
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}
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if (value.match(/^-?[0-9]+$/)) {
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return new BigNumber(_constructorGuard, toHex(new BN(value)));
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}
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return logger.throwArgumentError("invalid BigNumber string", "value", value);
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}
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if (typeof(value) === "number") {
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if (value % 1) {
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throwFault("underflow", "BigNumber.from", value);
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}
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if (value >= MAX_SAFE || value <= -MAX_SAFE) {
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throwFault("overflow", "BigNumber.from", value);
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}
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return BigNumber.from(String(value));
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}
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if (typeof(value) === "bigint") {
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return BigNumber.from((<any>value).toString());
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}
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if (isBytes(value)) {
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return BigNumber.from(hexlify(value));
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}
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if ((<any>value)._hex && isHexString((<any>value)._hex)) {
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return BigNumber.from((<any>value)._hex);
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}
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if ((<any>value).toHexString) {
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value = (<any>value).toHexString();
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if (typeof(value) === "string") {
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return BigNumber.from(value);
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}
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}
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return logger.throwArgumentError("invalid BigNumber value", "value", value);
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}
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static isBigNumber(value: any): value is BigNumber {
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return !!(value && value._isBigNumber);
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}
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}
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// Normalize the hex string
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function toHex(value: string | BN): string {
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// For BN, call on the hex string
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if (typeof(value) !== "string") {
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return toHex(value.toString(16));
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}
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// If negative, prepend the negative sign to the normalized positive value
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if (value[0] === "-") {
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// Strip off the negative sign
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value = value.substring(1);
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// Cannot have mulitple negative signs (e.g. "--0x04")
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if (value[0] === "-") { logger.throwArgumentError("invalid hex", "value", value); }
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// Call toHex on the positive component
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value = toHex(value);
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// Do not allow "-0x00"
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if (value === "0x00") { return value; }
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// Negate the value
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return "-" + value;
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}
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// Add a "0x" prefix if missing
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if (value.substring(0, 2) !== "0x") { value = "0x" + value; }
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// Normalize zero
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if (value === "0x") { return "0x00"; }
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// Make the string even length
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if (value.length % 2) { value = "0x0" + value.substring(2); }
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// Trim to smallest even-length string
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while (value.length > 4 && value.substring(0, 4) === "0x00") {
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value = "0x" + value.substring(4);
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}
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return value;
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}
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function toBigNumber(value: BN): BigNumber {
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return BigNumber.from(toHex(value));
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}
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function toBN(value: BigNumberish): BN {
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const hex = BigNumber.from(value).toHexString();
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if (hex[0] === "-") {
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return (new BN("-" + hex.substring(3), 16));
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}
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return new BN(hex.substring(2), 16);
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}
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function throwFault(fault: string, operation: string, value?: any): never {
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const params: any = { fault: fault, operation: operation };
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if (value != null) { params.value = value; }
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return logger.throwError(fault, Logger.errors.NUMERIC_FAULT, params);
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}
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