Class: Emu::Decoder

Inherits:
Object
  • Object
show all
Defined in:
lib/emu/decoder.rb

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ Decoder

Returns a new instance of Decoder.



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# File 'lib/emu/decoder.rb', line 6

def initialize(&block)
  @f = block
end

Instance Method Details

#>(value) ⇒ Object 



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# File 'lib/emu/decoder.rb', line 53

def >(value)
  fmap { |_| value }
end

#fmap ⇒ Object 



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# File 'lib/emu/decoder.rb', line 23

def fmap
  Decoder.new do |input|
    result = run(input)
    if result.error?
      result
    else
      Ok.new(yield result.unwrap)
    end
  end
end

#run(value) ⇒ Object 



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# File 'lib/emu/decoder.rb', line 10

def run(value)
  @f.call(value)
end

#run!(value) ⇒ Object 



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# File 'lib/emu/decoder.rb', line 14

def run!(value)
  result = run(value)
  if result.error?
    raise DecodeError, result.unwrap_err
  else
    result.unwrap
  end
end

#then ⇒ Object 



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# File 'lib/emu/decoder.rb', line 34

def then
  Decoder.new do |input|
    run(input).then do |result|
      (yield result).run(input)
    end
  end
end

#|(decoder) ⇒ Object 



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# File 'lib/emu/decoder.rb', line 42

def |(decoder)
  Decoder.new do |input|
    result = run(input)
    if result.error?
      decoder.run(input)
    else
      result
    end
  end
end