easy-currencies/dist/parts/chainer.js

A tool for easy conversion of currencies.

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Chainer = void 0;
const converter_1 = require("../converter");
/**
 * Chained converter.
 * It defaults to the basic API provider, and does not require initialization.
 *
 * @example
 *  let value = await Convert(15).from("USD").to("EUR");
 *
 * @export
 * @param {number} amount - amount of currency to convert
 * @returns
 */
function Chainer(amount = undefined) {
    let _currentAmount = amount;
    let _currentFrom = undefined;
    let _currentTo = undefined;
    let _currentRates = undefined;
    // local converter
    const _converter = new converter_1.Converter();
    /**
     *  Return object construction, prepared for chaining.
     */
    const chainable = {
        from: _from,
        to: _to,
        fetch: _fetch,
        get rates() {
            return _currentRates;
        },
        amount: _amount
    };
    /**
     * Chain member that fetches and caches the rates for the given currency.
     *
     * @returns chainable object
     */
    function _fetch() {
        return __awaiter(this, void 0, void 0, function* () {
            // fetching rates for the base currency
            _currentRates = yield _converter.getRates(_currentFrom, "", true);
            return chainable;
        });
    }
    // returning chainable
    return chainable;
    /**
     * Chain member that sets the base currency
     *
     * @param {string} from
     * @returns chainable object
     */
    function _amount(val) {
        _currentAmount = val;
        return chainable;
    }
    /**
     * Chain member that sets
     *
     * @param {string} from
     * @returns chainable object
     */
    function _from(from) {
        _currentFrom = from;
        return chainable;
    }
    /**
     * Final chain member (ends chain)
     *
     * @param {string} to - final currency
     * @returns {number} - final converted amount
     */
    function _to(to) {
        return __awaiter(this, void 0, void 0, function* () {
            _currentTo = to;
            // converting
            const result = yield _converter.convert(_currentAmount, _currentFrom, _currentTo, _currentRates);
            return result;
        });
    }
}
exports.Chainer = Chainer;
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