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import { DataItem } from 'ethereum-types';
import * as _ from 'lodash';
import { DataTypeFactory } from '../abstract_data_types/interfaces';
import { AbstractSetDataType } from '../abstract_data_types/types/set';
import { constants } from '../utils/constants';
export class ArrayDataType extends AbstractSetDataType {
private static readonly _MATCHER = RegExp('^(.+)\\[([0-9]*)\\]$');
private readonly _elementType: string;
public static matchType(type: string): boolean {
return ArrayDataType._MATCHER.test(type);
}
private static _decodeElementTypeAndLengthFromType(type: string): [string, undefined | number] {
const matches = ArrayDataType._MATCHER.exec(type);
if (_.isNull(matches) || matches.length !== 3) {
throw new Error(`Could not parse array: ${type}`);
} else if (_.isUndefined(matches[1])) {
throw new Error(`Could not parse array type: ${type}`);
} else if (_.isUndefined(matches[2])) {
throw new Error(`Could not parse array length: ${type}`);
}
const arrayElementType = matches[1];
const arrayLength = _.isEmpty(matches[2]) ? undefined : parseInt(matches[2], constants.DEC_BASE);
return [arrayElementType, arrayLength];
}
public constructor(dataItem: DataItem, dataTypeFactory: DataTypeFactory) {
// Construct parent
const isArray = true;
const [arrayElementType, arrayLength] = ArrayDataType._decodeElementTypeAndLengthFromType(dataItem.type);
super(dataItem, dataTypeFactory, isArray, arrayLength, arrayElementType);
// Set array properties
this._elementType = arrayElementType;
}
public getSignatureType(): string {
return this._computeSignature(false);
}
public getSignature(isDetailed?: boolean): string {
if (_.isEmpty(this.getDataItem().name) || !isDetailed) {
return this.getSignatureType();
}
const name = this.getDataItem().name;
const lastIndexOfScopeDelimiter = name.lastIndexOf('.');
const isScopedName = !_.isUndefined(lastIndexOfScopeDelimiter) && lastIndexOfScopeDelimiter > 0;
const shortName = isScopedName ? name.substr((lastIndexOfScopeDelimiter as number) + 1) : name;
const detailedSignature = `${shortName} ${this._computeSignature(isDetailed)}`;
return detailedSignature;
}
private _computeSignature(isDetailed?: boolean): string {
// Compute signature for a single array element
const elementDataItem: DataItem = {
type: this._elementType,
name: '',
};
const elementComponents = this.getDataItem().components;
if (!_.isUndefined(elementComponents)) {
elementDataItem.components = elementComponents;
}
const elementDataType = this.getFactory().create(elementDataItem);
const elementSignature = elementDataType.getSignature(isDetailed);
// Construct signature for array of type `element`
if (_.isUndefined(this._arrayLength)) {
return `${elementSignature}[]`;
} else {
return `${elementSignature}[${this._arrayLength}]`;
}
}
}
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