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node_modules/p-event/index.js

@@ -0,0 +1,272 @@
+'use strict';
+const pTimeout = require('p-timeout');
+
+const symbolAsyncIterator = Symbol.asyncIterator || '@@asyncIterator';
+
+const normalizeEmitter = emitter => {
+	const addListener = emitter.on || emitter.addListener || emitter.addEventListener;
+	const removeListener = emitter.off || emitter.removeListener || emitter.removeEventListener;
+
+	if (!addListener || !removeListener) {
+		throw new TypeError('Emitter is not compatible');
+	}
+
+	return {
+		addListener: addListener.bind(emitter),
+		removeListener: removeListener.bind(emitter)
+	};
+};
+
+const normalizeEvents = event => Array.isArray(event) ? event : [event];
+
+const multiple = (emitter, event, options) => {
+	let cancel;
+	const ret = new Promise((resolve, reject) => {
+		options = Object.assign({
+			rejectionEvents: ['error'],
+			multiArgs: false,
+			resolveImmediately: false
+		}, options);
+
+		if (!(options.count >= 0 && (options.count === Infinity || Number.isInteger(options.count)))) {
+			throw new TypeError('The `count` option should be at least 0 or more');
+		}
+
+		// Allow multiple events
+		const events = normalizeEvents(event);
+
+		const items = [];
+		const {addListener, removeListener} = normalizeEmitter(emitter);
+
+		const onItem = (...args) => {
+			const value = options.multiArgs ? args : args[0];
+
+			if (options.filter && !options.filter(value)) {
+				return;
+			}
+
+			items.push(value);
+
+			if (options.count === items.length) {
+				cancel();
+				resolve(items);
+			}
+		};
+
+		const rejectHandler = error => {
+			cancel();
+			reject(error);
+		};
+
+		cancel = () => {
+			for (const event of events) {
+				removeListener(event, onItem);
+			}
+
+			for (const rejectionEvent of options.rejectionEvents) {
+				removeListener(rejectionEvent, rejectHandler);
+			}
+		};
+
+		for (const event of events) {
+			addListener(event, onItem);
+		}
+
+		for (const rejectionEvent of options.rejectionEvents) {
+			addListener(rejectionEvent, rejectHandler);
+		}
+
+		if (options.resolveImmediately) {
+			resolve(items);
+		}
+	});
+
+	ret.cancel = cancel;
+
+	if (typeof options.timeout === 'number') {
+		const timeout = pTimeout(ret, options.timeout);
+		timeout.cancel = cancel;
+		return timeout;
+	}
+
+	return ret;
+};
+
+module.exports = (emitter, event, options) => {
+	if (typeof options === 'function') {
+		options = {filter: options};
+	}
+
+	options = Object.assign({}, options, {
+		count: 1,
+		resolveImmediately: false
+	});
+
+	const arrayPromise = multiple(emitter, event, options);
+
+	const promise = arrayPromise.then(array => array[0]);
+	promise.cancel = arrayPromise.cancel;
+
+	return promise;
+};
+
+module.exports.multiple = multiple;
+
+module.exports.iterator = (emitter, event, options) => {
+	if (typeof options === 'function') {
+		options = {filter: options};
+	}
+
+	// Allow multiple events
+	const events = normalizeEvents(event);
+
+	options = Object.assign({
+		rejectionEvents: ['error'],
+		resolutionEvents: [],
+		limit: Infinity,
+		multiArgs: false
+	}, options);
+
+	const {limit} = options;
+	const isValidLimit = limit >= 0 && (limit === Infinity || Number.isInteger(limit));
+	if (!isValidLimit) {
+		throw new TypeError('The `limit` option should be a non-negative integer or Infinity');
+	}
+
+	if (limit === 0) {
+		// Return an empty async iterator to avoid any further cost
+		return {
+			[Symbol.asyncIterator]() {
+				return this;
+			},
+			next() {
+				return Promise.resolve({done: true, value: undefined});
+			}
+		};
+	}
+
+	let isLimitReached = false;
+
+	const {addListener, removeListener} = normalizeEmitter(emitter);
+
+	let done = false;
+	let error;
+	let hasPendingError = false;
+	const nextQueue = [];
+	const valueQueue = [];
+	let eventCount = 0;
+
+	const valueHandler = (...args) => {
+		eventCount++;
+		isLimitReached = eventCount === limit;
+
+		const value = options.multiArgs ? args : args[0];
+
+		if (nextQueue.length > 0) {
+			const {resolve} = nextQueue.shift();
+
+			resolve({done: false, value});
+
+			if (isLimitReached) {
+				cancel();
+			}
+
+			return;
+		}
+
+		valueQueue.push(value);
+
+		if (isLimitReached) {
+			cancel();
+		}
+	};
+
+	const cancel = () => {
+		done = true;
+		for (const event of events) {
+			removeListener(event, valueHandler);
+		}
+
+		for (const rejectionEvent of options.rejectionEvents) {
+			removeListener(rejectionEvent, rejectHandler);
+		}
+
+		for (const resolutionEvent of options.resolutionEvents) {
+			removeListener(resolutionEvent, resolveHandler);
+		}
+
+		while (nextQueue.length > 0) {
+			const {resolve} = nextQueue.shift();
+			resolve({done: true, value: undefined});
+		}
+	};
+
+	const rejectHandler = (...args) => {
+		error = options.multiArgs ? args : args[0];
+
+		if (nextQueue.length > 0) {
+			const {reject} = nextQueue.shift();
+			reject(error);
+		} else {
+			hasPendingError = true;
+		}
+
+		cancel();
+	};
+
+	const resolveHandler = (...args) => {
+		const value = options.multiArgs ? args : args[0];
+
+		if (options.filter && !options.filter(value)) {
+			return;
+		}
+
+		if (nextQueue.length > 0) {
+			const {resolve} = nextQueue.shift();
+			resolve({done: true, value});
+		} else {
+			valueQueue.push(value);
+		}
+
+		cancel();
+	};
+
+	for (const event of events) {
+		addListener(event, valueHandler);
+	}
+
+	for (const rejectionEvent of options.rejectionEvents) {
+		addListener(rejectionEvent, rejectHandler);
+	}
+
+	for (const resolutionEvent of options.resolutionEvents) {
+		addListener(resolutionEvent, resolveHandler);
+	}
+
+	return {
+		[symbolAsyncIterator]() {
+			return this;
+		},
+		next() {
+			if (valueQueue.length > 0) {
+				const value = valueQueue.shift();
+				return Promise.resolve({done: done && valueQueue.length === 0 && !isLimitReached, value});
+			}
+
+			if (hasPendingError) {
+				hasPendingError = false;
+				return Promise.reject(error);
+			}
+
+			if (done) {
+				return Promise.resolve({done: true, value: undefined});
+			}
+
+			return new Promise((resolve, reject) => nextQueue.push({resolve, reject}));
+		},
+		return(value) {
+			cancel();
+			return Promise.resolve({done, value});
+		}
+	};
+};