Contents

# frozen_string_literal: true

module Coltrane
  # It describes a interval between 2 pitches
  class Interval
    attr_reader :semitones

    NAMES = %w[
      1P
      2m
      2M
      3m
      3M
      4P
      4A
      5P
      6m
      6M
      7m
      7M
    ].freeze

    def initialize(arg)
      @semitones = (case arg
                    when Interval then arg.semitones
                    when String   then NAMES.index(arg)
                    when Numeric  then arg
                    end) % 12
    end

    def name
      NAMES[semitones]
    end

    def +(other)
      case other
      when Numeric then Interval.new(semitones + other)
      when Interval then Interval.new(semitones + other.semitones)
      end
    end
  end
end

Version data entries

6 entries across 6 versions & 1 rubygems

Version	Path
coltrane-1.0.26	lib/coltrane/interval.rb
coltrane-1.0.24	lib/coltrane/interval.rb
coltrane-1.0.22	lib/coltrane/interval.rb
coltrane-1.0.21	lib/coltrane/interval.rb
coltrane-1.0.20	lib/coltrane/interval.rb
coltrane-1.0.2	lib/coltrane/interval.rb