mirror of
https://github.com/thangisme/notes.git
synced 2024-11-01 00:37:33 -04:00
75 lines
2.6 KiB
Markdown
75 lines
2.6 KiB
Markdown
# Split2(matcher, mapper, options)
|
|
|
|
[](http://travis-ci.org/mcollina/split2)
|
|
|
|
Break up a stream and reassemble it so that each line is a chunk.
|
|
`split2` is inspired by [@dominictarr](https://github.com/dominictarr) [`split`](https://github.com/dominictarr) module,
|
|
and it is totally API compatible with it.
|
|
However, it is based on [`through2`](https://github.com/rvagg/through2) by [@rvagg](https://github.com/rvagg) and it is fully based on Stream2.
|
|
|
|
`matcher` may be a `String`, or a `RegExp`. Example, read every line in a file ...
|
|
|
|
``` js
|
|
fs.createReadStream(file)
|
|
.pipe(split2())
|
|
.on('data', function (line) {
|
|
//each chunk now is a seperate line!
|
|
})
|
|
|
|
```
|
|
|
|
`split` takes the same arguments as `string.split` except it defaults to '/\r?\n/' instead of ',', and the optional `limit` paremeter is ignored.
|
|
[String#split](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/split)
|
|
|
|
`split` takes an optional options object on it's third argument, which
|
|
is directly passed as a
|
|
[Transform](http://nodejs.org/api/stream.html#stream_class_stream_transform_1)
|
|
option.
|
|
|
|
Calling `.destroy` will make the stream emit `close`. Use this to perform cleanup logic
|
|
|
|
``` js
|
|
var splitFile = function(filename) {
|
|
var file = fs.createReadStream(filename)
|
|
|
|
return file
|
|
.pipe(split2())
|
|
.on('close', function() {
|
|
// destroy the file stream in case the split stream was destroyed
|
|
file.destroy()
|
|
})
|
|
}
|
|
|
|
var stream = splitFile('my-file.txt')
|
|
|
|
stream.destroy() // will destroy the input file stream
|
|
```
|
|
|
|
# NDJ - Newline Delimited Json
|
|
|
|
`split2` accepts a function which transforms each line.
|
|
|
|
``` js
|
|
fs.createReadStream(file)
|
|
.pipe(split2(JSON.parse))
|
|
.on('data', function (obj) {
|
|
//each chunk now is a a js object
|
|
})
|
|
```
|
|
|
|
# License
|
|
|
|
Copyright (c) 2014, Matteo Collina <hello@matteocollina.com>
|
|
|
|
Permission to use, copy, modify, and/or distribute this software for any
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
|
|
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|