59 lines
2.0 KiB
TypeScript
59 lines
2.0 KiB
TypeScript
import { BigNumber } from '@0xproject/utils';
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import * as _ from 'lodash';
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export const utils = {
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isBigNumber(value: any): boolean {
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const isBigNumber = _.isObject(value) && value.isBigNumber;
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return isBigNumber;
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},
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convertHexToNumber(value: string): number {
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const valueBigNumber = new BigNumber(value);
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const valueNumber = valueBigNumber.toNumber();
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return valueNumber;
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},
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convertHexToNumberOrNull(hex: string | null): number | null {
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if (_.isNull(hex)) {
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return null;
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}
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const decimal = utils.convertHexToNumber(hex);
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return decimal;
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},
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convertAmountToBigNumber(value: string | number | BigNumber): BigNumber {
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const num = value || 0;
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const isBigNumber = utils.isBigNumber(num);
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if (isBigNumber) {
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return num as BigNumber;
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}
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if (_.isString(num) && (num.indexOf('0x') === 0 || num.indexOf('-0x') === 0)) {
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return new BigNumber(num.replace('0x', ''), 16);
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}
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const baseTen = 10;
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return new BigNumber((num as number).toString(baseTen), baseTen);
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},
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encodeAmountAsHexString(value: string | number | BigNumber): string {
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const valueBigNumber = utils.convertAmountToBigNumber(value);
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const hexBase = 16;
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const valueHex = valueBigNumber.toString(hexBase);
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return valueBigNumber.lessThan(0) ? `-0x${valueHex.substr(1)}` : `0x${valueHex}`;
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},
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numberToHex(value: number): string {
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if (!isFinite(value) && !utils.isHexStrict(value)) {
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throw new Error(`Given input ${value} is not a number.`);
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}
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const valueBigNumber = new BigNumber(value);
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const hexBase = 16;
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const result = valueBigNumber.toString(hexBase);
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return valueBigNumber.lt(0) ? `-0x${result.substr(1)}` : `0x${result}`;
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},
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isHexStrict(hex: string | number): boolean {
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return (
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(_.isString(hex) || _.isNumber(hex)) && /^(-)?0x[0-9a-f]*$/i.test(_.isNumber(hex) ? hex.toString() : hex)
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);
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},
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};
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