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author | fragosti <francesco.agosti93@gmail.com> | 2018-10-26 09:35:06 +0800 |
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committer | fragosti <francesco.agosti93@gmail.com> | 2018-10-26 09:35:06 +0800 |
commit | d5d99b9d2e3c793a95c68c1035246644b3ae80c6 (patch) | |
tree | 880f13fd7dba96285c23986e505f3166de099a4c /packages/instant/src/util/big_number_input.ts | |
parent | ab2759f43105c0f2d441790e138840706c6759f8 (diff) | |
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chore: dont override toString of BigNumber and other PR feedback
Diffstat (limited to 'packages/instant/src/util/big_number_input.ts')
-rw-r--r-- | packages/instant/src/util/big_number_input.ts | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/packages/instant/src/util/big_number_input.ts b/packages/instant/src/util/big_number_input.ts new file mode 100644 index 000000000..d2a9a8dc5 --- /dev/null +++ b/packages/instant/src/util/big_number_input.ts @@ -0,0 +1,29 @@ +import { BigNumber } from '@0x/utils'; +import * as _ from 'lodash'; + +/** + * A BigNumber extension that is more flexible about decimal strings. + * Such as allowing: + * new BigNumberInput('0.') => 0 + * new BigNumberInput('1.') => 1 + * new BigNumberInput('1..') => still throws + */ +export class BigNumberInput extends BigNumber { + private readonly _isEndingWithDecimal: boolean; + constructor(bigNumberString: string) { + const hasDecimalPeriod = _.endsWith(bigNumberString, '.'); + let internalString = bigNumberString; + if (hasDecimalPeriod) { + internalString = bigNumberString.slice(0, -1); + } + super(internalString); + this._isEndingWithDecimal = hasDecimalPeriod; + } + public toDisplayString(): string { + const internalString = super.toString(); + if (this._isEndingWithDecimal) { + return `${internalString}.`; + } + return internalString; + } +} |