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# frozen_string_literal: true
# A rhythmic value is a duration composed of a rhythmic unit, any number of dots, and a tied value.
class HeadMusic::RhythmicValue
attr_reader :unit, :dots, :tied_value
delegate :name, to: :unit, prefix: true
delegate :to_s, to: :name
def self.get(identifier)
case identifier
when HeadMusic::RhythmicValue
identifier
when HeadMusic::RhythmicUnit
new(identifier)
when Symbol, String
identifier = identifier.to_s.downcase.strip.gsub(/\W+/, '_')
from_words(identifier)
end
end
def self.from_words(identifier)
new(unit_from_words(identifier), dots: dots_from_words(identifier))
end
def self.unit_from_words(identifier)
identifier.gsub(/^\w*dotted_/, '')
end
def self.dots_from_words(identifier)
return 0 unless identifier.match?(/dotted/)
modifier, = identifier.split(/_*dotted_*/)
case modifier
when /tripl\w/
3
when /doubl\w/
2
else
1
end
end
def initialize(unit, dots: nil, tied_value: nil)
@unit = HeadMusic::RhythmicUnit.get(unit)
@dots = [0, 1, 2, 3].include?(dots) ? dots : 0
@tied_value = tied_value
end
def unit_value
unit.relative_value
end
def relative_value
unit_value * multiplier
end
def total_value
relative_value + (tied_value ? tied_value.total_value : 0)
end
def multiplier
(0..dots).reduce(0) { |sum, i| sum + 0.5**i }
end
def ticks
HeadMusic::Rhythm::PPQN * 4 * total_value
end
def per_whole
1.0 / relative_value
end
def name_modifier_prefix
case dots
when 1
'dotted'
when 2
'double-dotted'
when 3
'triple-dotted'
end
end
def single_value_name
[name_modifier_prefix, unit_name].compact.join(' ')
end
def name
if tied_value
[single_value_name, tied_value.name].compact.join(' tied to ')
else
single_value_name
end
end
def ==(other)
to_s == other.to_s
end
def to_s
name.tr('_', '-')
end
end
Version data entries
18 entries across 18 versions & 1 rubygems