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-rw-r--r--packages/utils/src/format_utils.ts61
1 files changed, 61 insertions, 0 deletions
diff --git a/packages/utils/src/format_utils.ts b/packages/utils/src/format_utils.ts
new file mode 100644
index 000000000..101854926
--- /dev/null
+++ b/packages/utils/src/format_utils.ts
@@ -0,0 +1,61 @@
+import * as _ from 'lodash';
+
+import { BigNumber } from './configured_bignumber';
+
+// tslint:disable:restrict-plus-operands
+export const formatUtils = {
+ isBigNumber(value: any): boolean {
+ const isBigNumber = _.isObject(value) && value.isBigNumber;
+ return isBigNumber;
+ },
+ convertHexToNumber(value: string): number {
+ const valueBigNumber = new BigNumber(value);
+ const valueNumber = valueBigNumber.toNumber();
+ return valueNumber;
+ },
+ convertHexToNumberOrNull(hex: string | null): number | null {
+ if (_.isNull(hex)) {
+ return null;
+ }
+ const decimal = this.convertHexToNumber(hex);
+ return decimal;
+ },
+ convertAmountToBigNumber(value: string | number | BigNumber): BigNumber {
+ const num = value || 0;
+ const isBigNumber = formatUtils.isBigNumber(num);
+ if (isBigNumber) {
+ return num as BigNumber;
+ }
+
+ if (_.isString(num) && (num.indexOf('0x') === 0 || num.indexOf('-0x') === 0)) {
+ return new BigNumber(num.replace('0x', ''), 16);
+ }
+
+ const baseTen = 10;
+ return new BigNumber((num as number).toString(baseTen), baseTen);
+ },
+ encodeAmountAsHexString(value: string | number | BigNumber): string {
+ const valueBigNumber = formatUtils.convertAmountToBigNumber(value);
+ const hexBase = 16;
+ const valueHex = valueBigNumber.toString(hexBase);
+
+ return valueBigNumber.lessThan(0) ? '-0x' + valueHex.substr(1) : '0x' + valueHex;
+ },
+ numberToHex(value: number): string {
+ if (!isFinite(value) && !this.isHexStrict(value)) {
+ throw new Error(`Given input ${value} is not a number.`);
+ }
+
+ const valueBigNumber = new BigNumber(value);
+ const hexBase = 16;
+ const result = valueBigNumber.toString(hexBase);
+
+ return valueBigNumber.lt(0) ? '-0x' + result.substr(1) : '0x' + result;
+ },
+ isHexStrict(hex: string | number): boolean {
+ return (
+ (_.isString(hex) || _.isNumber(hex)) && /^(-)?0x[0-9a-f]*$/i.test(_.isNumber(hex) ? hex.toString() : hex)
+ );
+ },
+};
+// tslint:enable:restrict-plus-operands