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var Stream = require('stream') // through // // a stream that does nothing but re-emit the input. // useful for aggregating a series of changing but not ending streams into one stream) exports = module.exports = through through.through = through //create a readable writable stream. function through (write, end, opts) { write = write || function (data) { this.queue(data) } end = end || function () { this.queue(null) } var ended = false, destroyed = false, buffer = [], _ended = false var stream = new Stream() stream.readable = stream.writable = true stream.paused = false // stream.autoPause = !(opts && opts.autoPause === false) stream.autoDestroy = !(opts && opts.autoDestroy === false) stream.write = function (data) { write.call(this, data) return !stream.paused } function drain() { while(buffer.length && !stream.paused) { var data = buffer.shift() if(null === data) return stream.emit('end') else stream.emit('data', data) } } stream.queue = stream.push = function (data) { // console.error(ended) if(_ended) return stream if(data === null) _ended = true buffer.push(data) drain() return stream } //this will be registered as the first 'end' listener //must call destroy next tick, to make sure we're after any //stream piped from here. //this is only a problem if end is not emitted synchronously. //a nicer way to do this is to make sure this is the last listener for 'end' stream.on('end', function () { stream.readable = false if(!stream.writable && stream.autoDestroy) process.nextTick(function () { stream.destroy() }) }) function _end () { stream.writable = false end.call(stream) if(!stream.readable && stream.autoDestroy) stream.destroy() } stream.end = function (data) { if(ended) return ended = true if(arguments.length) stream.write(data) _end() // will emit or queue return stream } stream.destroy = function () { if(destroyed) return destroyed = true ended = true buffer.length = 0 stream.writable = stream.readable = false stream.emit('close') return stream } stream.pause = function () { if(stream.paused) return stream.paused = true return stream } stream.resume = function () { if(stream.paused) { stream.paused = false stream.emit('resume') } drain() //may have become paused again, //as drain emits 'data'. if(!stream.paused) stream.emit('drain') return stream } return stream }