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import { DataItem, SolidityTypes } from 'ethereum-types';
import * as _ from 'lodash';
import { BigNumber } from '../../configured_bignumber';
import { DataTypeFactory } from '../abstract_data_types/interfaces';
import { AbstractBlobDataType } from '../abstract_data_types/types/blob';
import { RawCalldata } from '../calldata/raw_calldata';
import { constants } from '../utils/constants';
import * as EncoderMath from '../utils/math';
export class UIntDataType extends AbstractBlobDataType {
private static readonly _MATCHER = RegExp(
'^uint(8|16|24|32|40|48|56|64|72|88|96|104|112|120|128|136|144|152|160|168|176|184|192|200|208|216|224|232|240|248|256){0,1}$',
);
private static readonly _SIZE_KNOWN_AT_COMPILE_TIME: boolean = true;
private static readonly _MAX_WIDTH: number = 256;
private static readonly _DEFAULT_WIDTH: number = UIntDataType._MAX_WIDTH;
private static readonly _MIN_VALUE = new BigNumber(0);
private readonly _width: number;
private readonly _maxValue: BigNumber;
public static matchType(type: string): boolean {
return UIntDataType._MATCHER.test(type);
}
private static _decodeWidthFromType(type: string): number {
const matches = UIntDataType._MATCHER.exec(type);
const width =
!_.isNull(matches) && matches.length === 2 && !_.isUndefined(matches[1])
? parseInt(matches[1], constants.DEC_BASE)
: UIntDataType._DEFAULT_WIDTH;
return width;
}
public constructor(dataItem: DataItem, dataTypeFactory: DataTypeFactory) {
super(dataItem, dataTypeFactory, UIntDataType._SIZE_KNOWN_AT_COMPILE_TIME);
if (!UIntDataType.matchType(dataItem.type)) {
throw new Error(`Tried to instantiate UInt with bad input: ${dataItem}`);
}
this._width = UIntDataType._decodeWidthFromType(dataItem.type);
this._maxValue = new BigNumber(2).toPower(this._width).sub(1);
}
public encodeValue(value: BigNumber | string | number): Buffer {
const encodedValue = EncoderMath.safeEncodeNumericValue(value, UIntDataType._MIN_VALUE, this._maxValue);
return encodedValue;
}
public decodeValue(calldata: RawCalldata): BigNumber | number {
const valueBuf = calldata.popWord();
const value = EncoderMath.safeDecodeNumericValue(valueBuf, UIntDataType._MIN_VALUE, this._maxValue);
const numberOfBytesInUint8 = 8;
if (this._width === numberOfBytesInUint8) {
return value.toNumber();
}
return value;
}
public getSignatureType(): string {
return `${SolidityTypes.Uint}${this._width}`;
}
}
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