ubdate

node_modules/into-stream/index.js

@@ -0,0 +1,79 @@
+'use strict';
+const from = require('from2');
+const pIsPromise = require('p-is-promise');
+
+module.exports = x => {
+	if (Array.isArray(x)) {
+		x = x.slice();
+	}
+
+	let promise;
+	let iterator;
+
+	prepare(x);
+
+	function prepare(value) {
+		x = value;
+		promise = pIsPromise(x) ? x : null;
+		// we don't iterate on strings and buffers since slicing them is ~7x faster
+		const shouldIterate = !promise && x[Symbol.iterator] && typeof x !== 'string' && !Buffer.isBuffer(x);
+		iterator = shouldIterate ? x[Symbol.iterator]() : null;
+	}
+
+	return from(function reader(size, cb) {
+		if (promise) {
+			promise.then(prepare).then(() => reader.call(this, size, cb), cb);
+			return;
+		}
+
+		if (iterator) {
+			const obj = iterator.next();
+			setImmediate(cb, null, obj.done ? null : obj.value);
+			return;
+		}
+
+		if (x.length === 0) {
+			setImmediate(cb, null, null);
+			return;
+		}
+
+		const chunk = x.slice(0, size);
+		x = x.slice(size);
+
+		setImmediate(cb, null, chunk);
+	});
+};
+
+module.exports.obj = x => {
+	if (Array.isArray(x)) {
+		x = x.slice();
+	}
+
+	let promise;
+	let iterator;
+
+	prepare(x);
+
+	function prepare(value) {
+		x = value;
+		promise = pIsPromise(x) ? x : null;
+		iterator = !promise && x[Symbol.iterator] ? x[Symbol.iterator]() : null;
+	}
+
+	return from.obj(function reader(size, cb) {
+		if (promise) {
+			promise.then(prepare).then(() => reader.call(this, size, cb), cb);
+			return;
+		}
+
+		if (iterator) {
+			const obj = iterator.next();
+			setImmediate(cb, null, obj.done ? null : obj.value);
+			return;
+		}
+
+		this.push(x);
+
+		setImmediate(cb, null, null);
+	});
+};