Class: Vedeu::Output::Compressor

Inherits:
Object
  • Object
show all
Defined in:
lib/vedeu/output/compressor.rb

Overview

During the conversion of a Vedeu::Views::Char object into a string of escape sequences, this class removes multiple occurences of the same escape sequence, resulting in a smaller payload being sent to the renderer.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output) ⇒ Vedeu::Output::Compressor

Returns a new instance of Vedeu::Output::Compressor.

Parameters:



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# File 'lib/vedeu/output/compressor.rb', line 22

def initialize(output)
  @output = output
  @colour = ''
  @style  = ''
end

Instance Attribute Details

#output ⇒ Array<Array<Vedeu::Views::Char>> (readonly, protected)

Returns:



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# File 'lib/vedeu/output/compressor.rb', line 41

def output
  @output
end

Class Method Details

.render(output) ⇒ String

Parameters:

Returns:

  • (String) 


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# File 'lib/vedeu/output/compressor.rb', line 14

def self.render(output)
  new(output).render
end

Instance Method Details

#colour_for(char) ⇒ String (private)

Parameters:

Returns:

  • (String) 


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# File 'lib/vedeu/output/compressor.rb', line 78

def colour_for(char)
  return '' if char.colour == @colour

  @colour = char.colour
  @colour.to_s
end

#compress ⇒ String (private)

Returns:

  • (String) 


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# File 'lib/vedeu/output/compressor.rb', line 52

def compress
  Vedeu.timer('Compression') do
    out = ''

    content.each do |cell|
      out << cell.position.to_s
      out << colour_for(cell)
      out << style_for(cell)
      out << cell.value
    end

    out
  end
end

#content ⇒ Object (private) 



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# File 'lib/vedeu/output/compressor.rb', line 45

def content
  return [] if output.nil? || output.empty?

  output.content.delete_if { |cell| cell.is_a?(Vedeu::Models::Cell) }
end

#render ⇒ String

Note:

Takes approximately ~25ms for 2100 chars. (2015-07-25)

Returns:

  • (String) 


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# File 'lib/vedeu/output/compressor.rb', line 31

def render
  return compress if Vedeu::Configuration.compression?

  uncompress
end

#style_for(char) ⇒ String (private)

Parameters:

Returns:

  • (String) 


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# File 'lib/vedeu/output/compressor.rb', line 87

def style_for(char)
  return '' if char.style == @style

  @style = char.style
  @style.to_s
end

#uncompress ⇒ String (private)

Returns:

  • (String) 


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# File 'lib/vedeu/output/compressor.rb', line 68

def uncompress
  out = ''

  content.each { |cell| out << cell.to_s }

  out
end