1 files changed, 25 insertions, 0 deletions
diff --git a/packages/base-contract/src/utils.ts b/packages/base-contract/src/utils.ts
new file mode 100644
index 000000000..4b86bb1ad
--- /dev/null
+++ b/packages/base-contract/src/utils.ts
@@ -0,0 +1,25 @@
+import { DataItem } from '@0xproject/types';
+import * as _ from 'lodash';
+
+// tslint:disable-next-line:completed-docs
+export function formatABIDataItem(abi: DataItem, value: any, formatter: (type: string, value: any) => any): any {
+    const trailingArrayRegex = /\[\d*\]$/;
+    if (abi.type.match(trailingArrayRegex)) {
+        const arrayItemType = abi.type.replace(trailingArrayRegex, '');
+        return _.map(value, val => {
+            const arrayItemAbi = {
+                ...abi,
+                type: arrayItemType,
+            };
+            return formatABIDataItem(arrayItemAbi, val, formatter);
+        });
+    } else if (abi.type === 'tuple') {
+        const formattedTuple: { [componentName: string]: DataItem } = {};
+        _.forEach(abi.components, componentABI => {
+            formattedTuple[componentABI.name] = formatABIDataItem(componentABI, value[componentABI.name], formatter);
+        });
+        return formattedTuple;
+    } else {
+        return formatter(abi.type, value);
+    }
+}