Contents

# frozen_string_literal: true

# A grand staff is a group of staves for a single instrument, such as a piano.
class HeadMusic::GrandStaff
  GRAND_STAVES = {
    piano: {
      instrument: :piano,
      staves: [
        {clef: :treble_clef, for: :right_hand},
        {clef: :bass_clef, for: :left_hand}
      ]
    },
    organ: {
      instrument: :organ,
      staves: [
        {clef: :treble_clef, for: :right_hand},
        {clef: :bass_clef, for: :left_hand},
        {clef: :bass_clef, for: :pedals}
      ]
    }
  }.freeze

  def self.get(name)
    @grand_staves ||= {}
    hash_key = HeadMusic::Utilities::HashKey.for(name)
    return nil unless GRAND_STAVES.key?(hash_key)

    @grand_staves[hash_key] ||= new(hash_key)
  end

  attr_reader :identifier, :data

  def initialize(name)
    @identifier = HeadMusic::Utilities::HashKey.for(name)
    @data = GRAND_STAVES[identifier]
  end

  def instrument
    @instrument ||= HeadMusic::Instrument.get(data[:instrument])
  end

  def staves
    @staves ||=
      data[:staves].map do |staff|
        HeadMusic::Staff.new(staff[:clef], instrument: instrument)
      end
  end

  def brace_staves_index_first
    0
  end

  def brace_staves_index_last
    1
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
head_music-1.0.0	lib/head_music/grand_staff.rb
head_music-0.29.0	lib/head_music/grand_staff.rb
head_music-0.28.0	lib/head_music/grand_staff.rb