From 7ccfa8a8afe103e1cc2920724b6f17644fe5629d Mon Sep 17 00:00:00 2001
From: fragosti <francesco.agosti93@gmail.com>
Date: Tue, 23 Oct 2018 16:59:31 -0700
Subject: feat: support half-written decimal numbers in BigNumberInput

---
 packages/instant/src/util/big_number.ts | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 packages/instant/src/util/big_number.ts

(limited to 'packages/instant/src/util')

diff --git a/packages/instant/src/util/big_number.ts b/packages/instant/src/util/big_number.ts
new file mode 100644
index 000000000..773eb0cb4
--- /dev/null
+++ b/packages/instant/src/util/big_number.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 _hasDecimalPeriod: boolean;
+    constructor(bigNumberString: string) {
+        const hasDecimalPeriod = _.endsWith(bigNumberString, '.');
+        let internalString = bigNumberString;
+        if (hasDecimalPeriod) {
+            internalString = bigNumberString.slice(0, bigNumberString.length - 1);
+        }
+        super(internalString);
+        this._hasDecimalPeriod = hasDecimalPeriod;
+    }
+    public toString(): string {
+        const internalString = super.toString();
+        if (this._hasDecimalPeriod) {
+            return `${internalString}.`;
+        }
+        return internalString;
+    }
+}
-- 
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