Merge above

1 files changed, 230 insertions, 0 deletions

diff --git a/packages/utils/src/abi_encoder/abstract_data_types/member_data_type.ts b/packages/utils/src/abi_encoder/abstract_data_types/member_data_type.ts
new file mode 100644
index 000000000..f44a6dd30
--- /dev/null
+++ b/packages/utils/src/abi_encoder/abstract_data_types/member_data_type.ts
@@ -0,0 +1,230 @@
+import { DataItem } from 'ethereum-types';
+import * as ethUtil from 'ethereumjs-util';
+import * as _ from 'lodash';
+
+import { BigNumber } from '../../configured_bignumber';
+import { CalldataBlock, MemberCalldataBlock, RawCalldata } from '../calldata';
+import * as Constants from '../constants';
+import { DecodingRules } from '../utils/rules';
+
+import { DataType } from './data_type';
+import { DependentDataType } from './dependent_data_type';
+import { DataTypeFactory } from './interfaces';
+
+interface MemberMap {
+    [key: string]: number;
+}
+
+export abstract class MemberDataType extends DataType {
+    protected readonly _arrayLength: number | undefined;
+    protected readonly _arrayElementType: string | undefined;
+    private readonly _memberMap: MemberMap;
+    private readonly _members: DataType[];
+    private readonly _isArray: boolean;
+
+    public constructor(
+        dataItem: DataItem,
+        factory: DataTypeFactory,
+        isArray: boolean = false,
+        arrayLength?: number,
+        arrayElementType?: string,
+    ) {
+        super(dataItem, factory);
+        this._memberMap = {};
+        this._members = [];
+        this._isArray = isArray;
+        this._arrayLength = arrayLength;
+        this._arrayElementType = arrayElementType;
+        if (isArray && arrayLength !== undefined) {
+            [this._members, this._memberMap] = this._createMembersWithLength(dataItem, arrayLength);
+        } else if (!isArray) {
+            [this._members, this._memberMap] = this._createMembersWithKeys(dataItem);
+        }
+    }
+
+    public generateCalldataBlock(value: any[] | object, parentBlock?: CalldataBlock): MemberCalldataBlock {
+        const block =
+            value instanceof Array
+                ? this._generateCalldataBlockFromArray(value, parentBlock)
+                : this._generateCalldataBlockFromObject(value, parentBlock);
+        return block;
+    }
+
+    public generateValue(calldata: RawCalldata, rules: DecodingRules): any[] | object {
+        let members = this._members;
+        if (this._isArray && this._arrayLength === undefined) {
+            const arrayLengthBuf = calldata.popWord();
+            const arrayLengthHex = ethUtil.bufferToHex(arrayLengthBuf);
+            const hexBase = 16;
+            const arrayLength = new BigNumber(arrayLengthHex, hexBase);
+
+            [members] = this._createMembersWithLength(this.getDataItem(), arrayLength.toNumber());
+        }
+
+        calldata.startScope();
+        let value: any[] | object;
+        if (rules.structsAsObjects && !this._isArray) {
+            value = {};
+            _.each(this._memberMap, (idx: number, key: string) => {
+                const member = this._members[idx];
+                const memberValue = member.generateValue(calldata, rules);
+                (value as { [key: string]: any })[key] = memberValue;
+            });
+        } else {
+            value = [];
+            _.each(members, (member: DataType, idx: number) => {
+                const memberValue = member.generateValue(calldata, rules);
+                (value as any[]).push(memberValue);
+            });
+        }
+        calldata.endScope();
+        return value;
+    }
+
+    public isStatic(): boolean {
+        /* For Tuple:
+                    const isStaticTuple = this.children.length === 0;
+                    return isStaticTuple; // @TODO: True in every case or only when dynamic data?
+
+           For Array:
+                if isLengthDefined = false then this is false
+
+                Otherwise if the first element is a Pointer then false
+        */
+
+        if (this._isArray && this._arrayLength === undefined) {
+            return false;
+        }
+
+        // Search for dependent members
+        const dependentMember = _.find(this._members, (member: DataType) => {
+            return member instanceof DependentDataType;
+        });
+        const isStatic = dependentMember === undefined; // static if we couldn't find a dependent member
+        return isStatic;
+    }
+
+    protected _generateCalldataBlockFromArray(value: any[], parentBlock?: CalldataBlock): MemberCalldataBlock {
+        // Sanity check length
+        if (this._arrayLength !== undefined && value.length !== this._arrayLength) {
+            throw new Error(
+                `Expected array of ${JSON.stringify(
+                    this._arrayLength,
+                )} elements, but got array of length ${JSON.stringify(value.length)}`,
+            );
+        }
+
+        const parentName = parentBlock === undefined ? '' : parentBlock.getName();
+        const methodBlock: MemberCalldataBlock = new MemberCalldataBlock(
+            this.getDataItem().name,
+            this.getSignature(),
+            parentName,
+        );
+
+        let members = this._members;
+        if (this._isArray && this._arrayLength === undefined) {
+            [members] = this._createMembersWithLength(this.getDataItem(), value.length);
+
+            const lenBuf = ethUtil.setLengthLeft(
+                ethUtil.toBuffer(`0x${value.length.toString(Constants.HEX_BASE)}`),
+                Constants.EVM_WORD_WIDTH_IN_BYTES,
+            );
+            methodBlock.setHeader(lenBuf);
+        }
+
+        const memberBlocks: CalldataBlock[] = [];
+        _.each(members, (member: DataType, idx: number) => {
+            const block = member.generateCalldataBlock(value[idx], methodBlock);
+            memberBlocks.push(block);
+        });
+        methodBlock.setMembers(memberBlocks);
+        return methodBlock;
+    }
+
+    protected _generateCalldataBlockFromObject(obj: object, parentBlock?: CalldataBlock): MemberCalldataBlock {
+        const parentName = parentBlock === undefined ? '' : parentBlock.getName();
+        const methodBlock: MemberCalldataBlock = new MemberCalldataBlock(
+            this.getDataItem().name,
+            this.getSignature(),
+            parentName,
+        );
+        const memberBlocks: CalldataBlock[] = [];
+        const childMap = _.cloneDeep(this._memberMap);
+        _.forOwn(obj, (value: any, key: string) => {
+            if (!(key in childMap)) {
+                throw new Error(
+                    `Could not assign tuple to object: unrecognized key '${key}' in object ${this.getDataItem().name}`,
+                );
+            }
+            const block = this._members[this._memberMap[key]].generateCalldataBlock(value, methodBlock);
+            memberBlocks.push(block);
+            delete childMap[key];
+        });
+
+        if (Object.keys(childMap).length !== 0) {
+            throw new Error(`Could not assign tuple to object: missing keys ${Object.keys(childMap)}`);
+        }
+
+        methodBlock.setMembers(memberBlocks);
+        return methodBlock;
+    }
+
+    protected _computeSignatureOfMembers(): string {
+        // Compute signature of members
+        let signature = `(`;
+        _.each(this._members, (member: DataType, i: number) => {
+            signature += member.getSignature();
+            if (i < this._members.length - 1) {
+                signature += ',';
+            }
+        });
+        signature += ')';
+        return signature;
+    }
+
+    private _createMembersWithKeys(dataItem: DataItem): [DataType[], MemberMap] {
+        // Sanity check
+        if (dataItem.components === undefined) {
+            throw new Error(`Expected components`);
+        }
+
+        const members: DataType[] = [];
+        const memberMap: MemberMap = {};
+        _.each(dataItem.components, (memberItem: DataItem) => {
+            const childDataItem: DataItem = {
+                type: memberItem.type,
+                name: `${dataItem.name}.${memberItem.name}`,
+            };
+            const components = memberItem.components;
+            if (components !== undefined) {
+                childDataItem.components = components;
+            }
+            const child = this.getFactory().create(childDataItem, this);
+            memberMap[memberItem.name] = members.length;
+            members.push(child);
+        });
+
+        return [members, memberMap];
+    }
+
+    private _createMembersWithLength(dataItem: DataItem, length: number): [DataType[], MemberMap] {
+        const members: DataType[] = [];
+        const memberMap: MemberMap = {};
+        const range = _.range(length);
+        _.each(range, (idx: number) => {
+            const childDataItem: DataItem = {
+                type: this._arrayElementType ? this._arrayElementType : '',
+                name: `${dataItem.name}[${idx.toString(Constants.DEC_BASE)}]`,
+            };
+            const components = dataItem.components;
+            if (components !== undefined) {
+                childDataItem.components = components;
+            }
+            const child = this.getFactory().create(childDataItem, this);
+            memberMap[idx.toString(Constants.DEC_BASE)] = members.length;
+            members.push(child);
+        });
+
+        return [members, memberMap];
+    }
+}