73 lines
1.2 KiB
JavaScript
Executable File
73 lines
1.2 KiB
JavaScript
Executable File
|
|
/**
|
|
* Module dependencies.
|
|
*/
|
|
|
|
var duplexer = require('duplexer2');
|
|
var Stream = require('stream');
|
|
|
|
/**
|
|
* Slice reference.
|
|
*/
|
|
|
|
var slice = [].slice;
|
|
|
|
/**
|
|
* Duplexer options.
|
|
*/
|
|
|
|
var opts = {
|
|
bubbleErrors: false
|
|
};
|
|
|
|
/**
|
|
* Expose `pipe`.
|
|
*/
|
|
|
|
module.exports = pipe;
|
|
|
|
/**
|
|
* Pipe.
|
|
*
|
|
* @param {Stream,...,[Function]}
|
|
* @return {Stream}
|
|
* @api public
|
|
*/
|
|
|
|
function pipe(){
|
|
if (arguments.length == 1) return arguments[0];
|
|
var streams = slice.call(arguments);
|
|
var cb;
|
|
if ('function' == typeof streams[streams.length - 1]) {
|
|
cb = streams.splice(-1)[0];
|
|
}
|
|
var first = streams[0];
|
|
var last = streams[streams.length - 1];
|
|
var ret;
|
|
|
|
if (first.writable && last.readable) ret = duplexer(opts, first, last);
|
|
else if (first.writable) ret = first;
|
|
else if (last.readable) ret = last;
|
|
else ret = new Stream;
|
|
|
|
streams.forEach(function(stream, i){
|
|
var next = streams[i+1];
|
|
if (next) stream.pipe(next);
|
|
if (stream != ret) stream.on('error', ret.emit.bind(ret, 'error'));
|
|
});
|
|
|
|
if (cb) {
|
|
var ended = false;
|
|
ret.on('error', end);
|
|
last.on('finish', end);
|
|
function end(err){
|
|
if (ended) return;
|
|
ended = true;
|
|
cb(err);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|