time-to-botec

README.md (5177B)

---

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 @license Apache-2.0
 
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 See the License for the specific language governing permissions and
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 # Split Stream
 
 > [Transform stream][transform-stream] which splits streamed data.
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var splitStream = require( '@stdlib/streams/node/split' );
 ```
 
 <a name="split-stream"></a>
 
 #### splitStream( \[options] )
 
 Creates a [transform stream][transform-stream] which splits streamed data.
 
 ```javascript
 var stdout = require( '@stdlib/streams/node/stdout' );
 
 var stream = splitStream();
 
 stream.pipe( stdout );
 stream.write( '1\n2\n3' );
 
 stream.end();
 
 // prints: 1 => 2 => 3
 ```
 
 The function accepts the following `options`:
 
 -   **sep**: separator used to split streamed data. Similar to [`String#split`][string-split], a separator may be either a [regular expression][regexp] or a `string`. Default: `/\r?\n/`.
 -   **objectMode**: specifies whether a [stream][stream] should operate in [objectMode][object-mode]. Default: `false`.
 -   **encoding**: specifies how `Buffer` objects should be decoded to `strings`. Default: `null`.
 -   **highWaterMark**: specifies the `Buffer` level at which `write()` calls start returning `false`.
 -   **allowHalfOpen**: specifies whether a [stream][stream] should remain open even if one side ends. Default: `false`.
 -   **writableObjectMode**: specifies whether the writable side should be in [objectMode][object-mode]. Default: `false`.
 
 To set [stream][stream] `options`,
 
 ```javascript
 var opts = {
     'sep': ',',
     'objectMode': true,
     'encoding': 'utf8',
     'highWaterMark': 64,
     'allowHalfOpen': true,
     'writableObjectMode': false // overridden by `objectMode` option when `objectMode=true`
 };
 
 var stream = splitStream( opts );
 ```
 
 #### splitStream.factory( \[options] )
 
 Returns a `function` for creating [streams][transform-stream] which are identically configured according to provided `options`.
 
 ```javascript
 var opts = {
     'sep': '\t',
     'objectMode': true,
     'encoding': 'utf8',
     'highWaterMark': 64
 };
 
 var factory = splitStream.factory( opts );
 
 // Create 10 identically configured streams...
 var streams = [];
 var i;
 for ( i = 0; i < 10; i++ ) {
     streams.push( factory() );
 }
 ```
 
 This method accepts the same `options` as [`splitStream()`](#split-stream).
 
 #### splitStream.objectMode( \[options] )
 
 This method is a convenience function to create [streams][stream] which always operate in [objectMode][object-mode].
 
 ```javascript
 var stdout = require( '@stdlib/streams/node/stdout' );
 
 var stream = splitStream.objectMode({
     'sep': ','
 });
 
 stream.pipe( stdout );
 stream.write( 'a,b,c' );
 
 stream.end();
 
 // prints: a => b => c
 ```
 
 This method accepts the same `options` as [`splitStream()`](#split-stream); however, the method will **always** override the [objectMode][object-mode] option in `options`.
 
 </section>
 
 <!-- /.usage -->
 
 <section class="notes">
 
 ## Notes
 
 -   Similar to [`String#split`][string-split], a separator which is a [regular expression][regexp] containing a matching group will result in the separator being retained in the output stream.
 
     ```javascript
     var stdout = require( '@stdlib/streams/node/stdout' );
 
     var stream = splitStream({
         'sep': /(,)/
     });
 
     stream.pipe( stdout );
     stream.write( '1,2,3' );
 
     stream.end();
 
     // prints: 1 => , => 2 => , => 3
     ```
 
 </section>
 
 <!-- /.notes -->
 
 <section class="examples">
 
 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var transformStream = require( '@stdlib/streams/node/transform' );
 var stdout = require( '@stdlib/streams/node/stdout' );
 var splitStream = require( '@stdlib/streams/node/split' );
 
 function append( chunk, enc, clbk ) {
     clbk( null, chunk.toString()+'\n' );
 }
 
 var newline;
 var stream;
 var i;
 
 // Create a split stream to split tab delimited data:
 stream = splitStream({
     'sep': /\t/
 });
 
 // Create a transform stream to make newline delimited data...
 newline = transformStream({
     'transform': append,
     'objectMode': true
 });
 
 // Create a stream pipeline:
 stream
     .pipe( newline )
     .pipe( stdout );
 
 // Write data to the pipeline...
 for ( i = 0; i < 10; i++ ) {
     stream.write( i+'\t', 'utf8' );
 }
 stream.end();
 ```
 
 </section>
 
 <!-- /.examples -->
 
 <section class="links">
 
 [stream]: https://nodejs.org/api/stream.html
 
 [transform-stream]: https://nodejs.org/api/stream.html
 
 [object-mode]: https://nodejs.org/api/stream.html#stream_object_mode
 
 [string-split]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split
 
 [regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
 
 </section>
 
 <!-- /.links -->