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/* tslint:disable prefer-function-over-method */
import { DataItem } from 'ethereum-types';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import { CalldataBlock, CalldataBlocks, RawCalldata } from '../../calldata';
import * as Constants from '../../utils/constants';
import { DecodingRules } from '../../utils/rules';
import { DataType } from '../data_type';
import { DataTypeFactory } from '../interfaces';
export abstract class Pointer extends DataType {
protected _destination: DataType;
protected _parent: DataType;
public constructor(dataItem: DataItem, factory: DataTypeFactory, destination: DataType, parent: DataType) {
super(dataItem, factory);
this._destination = destination;
this._parent = parent;
}
public generateCalldataBlock(value: any, parentBlock?: CalldataBlock): CalldataBlocks.Pointer {
if (_.isUndefined(parentBlock)) {
throw new Error(`DependentDataType requires a parent block to generate its block`);
}
const destinationBlock = this._destination.generateCalldataBlock(value, parentBlock);
const name = this.getDataItem().name;
const signature = this.getSignature();
const parentName = parentBlock.getName();
const block = new CalldataBlocks.Pointer(name, signature, parentName, destinationBlock, parentBlock);
return block;
}
public generateValue(calldata: RawCalldata, rules: DecodingRules): any {
const destinationOffsetBuf = calldata.popWord();
const destinationOffsetHex = ethUtil.bufferToHex(destinationOffsetBuf);
const destinationOffsetRelative = parseInt(destinationOffsetHex, Constants.HEX_BASE);
const destinationOffsetAbsolute = calldata.toAbsoluteOffset(destinationOffsetRelative);
const currentOffset = calldata.getOffset();
calldata.setOffset(destinationOffsetAbsolute);
const value = this._destination.generateValue(calldata, rules);
calldata.setOffset(currentOffset);
return value;
}
public isStatic(): boolean {
return true;
}
}
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