1 files changed, 58 insertions, 0 deletions
diff --git a/packages/utils/src/abi_encoder/abstract_data_types/data_type.ts b/packages/utils/src/abi_encoder/abstract_data_types/data_type.ts
new file mode 100644
index 000000000..13cc87e2a
--- /dev/null
+++ b/packages/utils/src/abi_encoder/abstract_data_types/data_type.ts
@@ -0,0 +1,58 @@
+import { DataItem } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { Calldata } from '../calldata/calldata';
+import { CalldataBlock } from '../calldata/calldata_block';
+import { RawCalldata } from '../calldata/raw_calldata';
+import { constants } from '../utils/constants';
+import { DecodingRules, EncodingRules } from '../utils/rules';
+
+import { DataTypeFactory } from './interfaces';
+
+export abstract class DataType {
+    private readonly _dataItem: DataItem;
+    private readonly _factory: DataTypeFactory;
+
+    constructor(dataItem: DataItem, factory: DataTypeFactory) {
+        this._dataItem = dataItem;
+        this._factory = factory;
+    }
+
+    public getDataItem(): DataItem {
+        return this._dataItem;
+    }
+
+    public getFactory(): DataTypeFactory {
+        return this._factory;
+    }
+
+    public encode(value: any, rules?: EncodingRules, selector?: string): string {
+        const rules_ = _.isUndefined(rules) ? constants.DEFAULT_ENCODING_RULES : rules;
+        const calldata = new Calldata(rules_);
+        if (!_.isUndefined(selector)) {
+            calldata.setSelector(selector);
+        }
+        const block = this.generateCalldataBlock(value);
+        calldata.setRoot(block);
+        const encodedCalldata = calldata.toString();
+        return encodedCalldata;
+    }
+
+    public decode(calldata: string, rules?: DecodingRules, selector?: string): any {
+        if (!_.isUndefined(selector) && !_.startsWith(calldata, selector)) {
+            throw new Error(
+                `Tried to decode calldata, but it was missing the function selector. Expected prefix '${selector}'. Got '${calldata}'.`,
+            );
+        }
+        const hasSelector = !_.isUndefined(selector);
+        const rawCalldata = new RawCalldata(calldata, hasSelector);
+        const rules_ = _.isUndefined(rules) ? constants.DEFAULT_DECODING_RULES : rules;
+        const value = this.generateValue(rawCalldata, rules_);
+        return value;
+    }
+
+    public abstract generateCalldataBlock(value: any, parentBlock?: CalldataBlock): CalldataBlock;
+    public abstract generateValue(calldata: RawCalldata, rules: DecodingRules): any;
+    public abstract getSignature(): string;
+    public abstract isStatic(): boolean;
+}