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