var Writable = require("stream").Writable
var inherits = require("util").inherits

function Sink(options) {
  Writable.call(this, options)
}

inherits(Sink, Writable)

Sink.prototype._write = function (chunk, encoding, callback) {
  console.log(chunk.toString())
  callback()
}


// a simple source stream
var Readable = require('stream').Readable;
var source = new Readable;
source.push('the quick brown fox ');
source.push('jumps over the lazy dog.\n');
source.push(null);

var sink = new Sink;
source.pipe(sink);

{Readable, Writable} = require('stream')

class Sink extends Writable

  _write: (data, enc, next) ->
    console.log(data.toString())
    next()


# a simple source stream
source = new Readable
source.push 'the quick brown fox '
source.push 'jumps over the lazy dog.\n'
source.push null

sink = new Sink
source.pipe(sink)

# the quick brown fox 
# jumps over the lazy dog.


###

Same example as above except that the source stream passes strings (instead of buffers) and the sink stream doesn't decode the strings to buffers before writing.

###
class Sink extends Writable

  constructor: -> 
    super(decodeStrings: false)           # don't decode strings

  _write: (data, enc, next) ->
    console.log(data)
    next()


# a simple source stream
source = new Readable(encoding: 'utf8')   # buffers will be decoded to strings
source.push 'the quick brown fox '
source.push 'jumps over the lazy dog.\n'
source.push null

sink = new Sink
source.pipe(sink)

# the quick brown fox 
# jumps over the lazy dog.

var Transform = require("stream").Transform
var inherits = require("util").inherits

function ToUpper (options) {
  Transform.call(this, options)
}

inherits(ToUpper, Transform)

ToUpper.prototype._transform = function (chunk, encoding, callback) {
  var str = chunk.toString().toUpperCase()
  this.push(str)
  callback()
}

// a simple transform stream
var tx = new ToUpper;

// a simple source stream
var Readable = require('stream').Readable;
var rs = new Readable;
rs.push('the quick brown fox ');
rs.push('jumps over the lazy dog.\n');
rs.push(null);

rs.pipe(tx).pipe(process.stdout);

// THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.

{Readable, Transform} = require("stream")

class ToUpper extends Transform

  _transform: (data, enc, next) ->
    @push data.toString().toUpperCase()
    next()


# a simple transform stream
tx = new ToUpper

# a simple source stream
rs = new Readable
rs.push 'the quick brown fox jumps over the lazy dog!\n'
rs.push null 

rs.pipe(tx)
  .pipe(process.stdout)   # THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG!

var Readable = require("stream").Readable
var inherits = require("util").inherits

function Source(content, options) {
  Readable.call(this, options)
  this.content = content
}

inherits(Source, Readable)

Source.prototype._read = function (size) {
  if (!this.content) this.push(null)
  else {
    this.push(this.content.slice(0, size))
    this.content = this.content.slice(size)
  }
}

var s = new Source("The quick brown fox jumps over the lazy dog.")
console.log(s.read(10).toString())
console.log(s.read(10).toString())
console.log(s.read(10).toString())
console.log(s.read(10).toString())
console.log(s.read(10).toString())

// The quick 
// brown fox 
// jumps over
//  the lazy 
// dog.


var q = new Source("How now brown cow?")
q.pipe(process.stdout)

// How now brown cow?

Readable = require("stream").Readable

class Source extends Readable
  
  constructor: (@content, options) ->
    super options

  _read: (size) ->
    if not @content
      @push null 
    else
      @push(@content.slice(0, size))
      @content = @content.slice(size)


s = new Source("The quick brown fox jumps over the lazy dog.")
console.log(chunk.toString()) while chunk = s.read(10)  # print in 10 byte chunks

# The quick 
# brown fox 
# jumps over
#  the lazy 
# dog.


s = new Source("How now brown cow?")
s.pipe(process.stdout)

# How now brown cow?