Class: Chordproko::Chord

Inherits:
Object
  • Object
show all
Defined in:
lib/chordproko/chord.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(content) ⇒ Chord

Returns a new instance of Chord.



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# File 'lib/chordproko/chord.rb', line 5

def initialize content
  @content = content  
  @chord_list = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]
  @chord_indexes = {
    "C" => 0,
    "D" => 2,
    "E" => 4,
    "F" => 5,
    "G" => 7,
    "A" => 9,
    "B" => 11,
  }
end

Instance Attribute Details

#content ⇒ Object

Returns the value of attribute content.



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# File 'lib/chordproko/chord.rb', line 4

def content
  @content
end

#key ⇒ Object

Returns the value of attribute key.



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# File 'lib/chordproko/chord.rb', line 4

def key
  @key
end

Instance Method Details

#each(&block) ⇒ Object 



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# File 'lib/chordproko/chord.rb', line 18

def each(&block)
  [self].each(&block)
end

#to_s ⇒ Object 



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# File 'lib/chordproko/chord.rb', line 21

def to_s
  "#{transpose_key}"
end

#transpose_key ⇒ Object 



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# File 'lib/chordproko/chord.rb', line 24

def transpose_key
  return @content.to_s if @key == 0
  chord_value = @chord_indexes[@content.to_s[0]]
  @content.to_s[1..-1].each_char do |mod|
    case mod
    when "#"
      chord_value += 1
    when "b"
      chord_value -= 1
    end
  end
  chord_index = (chord_value + @key)% 12
  res = @chord_list[chord_index]

end