Class: Dommy::TransformStream

Inherits:
Object
  • Object
show all
Defined in:
lib/dommy/streams.rb

Overview

‘TransformStream` — links a writable + readable so chunks flow through a `transform` callback.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(window, transformer = nil) ⇒ TransformStream

Returns a new instance of TransformStream.



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# File 'lib/dommy/streams.rb', line 315

def initialize(window, transformer = nil)
  @window = window
  t = transformer.is_a?(Hash) ? transformer.transform_keys(&:to_s) : {}

  @readable = ReadableStream.new(window)
  controller = TransformStreamDefaultController.new(@readable)

  @writable = WritableStream.new(
    window,
    {
      "write" => proc do |chunk|
        if t["transform"].respond_to?(:__js_call__)
          t["transform"].__js_call__("call", [chunk, controller])
        elsif t["transform"].respond_to?(:call)
          t["transform"].call(chunk, controller)
        else
          controller.enqueue(chunk)
        end
      end,
      "close" => proc { @readable.__close__ },
      "abort" => proc { |reason| @readable.__error__(reason) }
    }
  )

  if t["start"]
    if t["start"].respond_to?(:__js_call__)
      t["start"].__js_call__("call", [controller])
    elsif t["start"].respond_to?(:call)
      t["start"].call(controller)
    end
  end
end

Instance Attribute Details

#readable ⇒ Object (readonly)

Returns the value of attribute readable.



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# File 'lib/dommy/streams.rb', line 313

def readable
  @readable
end

#writable ⇒ Object (readonly)

Returns the value of attribute writable.



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# File 'lib/dommy/streams.rb', line 313

def writable
  @writable
end

Instance Method Details

#__js_get__(key) ⇒ Object 



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# File 'lib/dommy/streams.rb', line 348

def __js_get__(key)
  case key
  when "readable"
    @readable
  when "writable"
    @writable
  end
end