forked from zhurui/management
70 lines
1.1 KiB
JavaScript
70 lines
1.1 KiB
JavaScript
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/*!
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* unpipe
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* Copyright(c) 2015 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module exports.
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* @public
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*/
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module.exports = unpipe
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/**
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* Determine if there are Node.js pipe-like data listeners.
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* @private
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*/
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function hasPipeDataListeners(stream) {
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var listeners = stream.listeners('data')
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for (var i = 0; i < listeners.length; i++) {
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if (listeners[i].name === 'ondata') {
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return true
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}
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}
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return false
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}
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/**
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* Unpipe a stream from all destinations.
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*
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* @param {object} stream
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* @public
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*/
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function unpipe(stream) {
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if (!stream) {
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throw new TypeError('argument stream is required')
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}
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if (typeof stream.unpipe === 'function') {
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// new-style
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stream.unpipe()
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return
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}
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// Node.js 0.8 hack
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if (!hasPipeDataListeners(stream)) {
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return
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}
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var listener
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var listeners = stream.listeners('close')
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for (var i = 0; i < listeners.length; i++) {
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listener = listeners[i]
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if (listener.name !== 'cleanup' && listener.name !== 'onclose') {
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continue
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}
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// invoke the listener
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listener.call(stream)
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}
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}
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