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Contents
# frozen_string_literal: true
# A quality is a categorization of an interval.
class HeadMusic::Quality
SHORTHAND = {
perfect: 'P',
major: 'M',
minor: 'm',
diminished: 'd',
augmented: 'A',
doubly_diminished: 'dd',
doubly_augmented: 'AA',
}.freeze
NAMES = SHORTHAND.keys
PERFECT_INTERVAL_MODIFICATION = {
-2 => :doubly_diminished,
-1 => :diminished,
0 => :perfect,
1 => :augmented,
2 => :doubly_augmented,
}.freeze
MAJOR_INTERVAL_MODIFICATION = {
-2 => :diminished,
-1 => :minor,
0 => :major,
1 => :augmented,
2 => :doubly_augmented,
}.freeze
def self.get(identifier)
@qualities ||= {}
identifier = identifier.to_s.to_sym
@qualities[identifier] ||= new(identifier) if NAMES.include?(identifier)
end
def self.from(starting_quality, delta)
if starting_quality == :perfect
PERFECT_INTERVAL_MODIFICATION[delta].to_s.gsub(/_+/, ' ')
elsif starting_quality == :major
MAJOR_INTERVAL_MODIFICATION[delta].to_s.gsub(/_+/, ' ')
end
end
attr_reader :name
delegate :to_s, to: :name
def initialize(name)
@name = name
end
def ==(other)
to_s == other.to_s
end
def shorthand
SHORTHAND[name]
end
def article
%w[a e i o u h].include?(name.to_s.first) ? 'an' : 'a'
end
NAMES.each do |method_name|
define_method(:"#{method_name}?") { name == method_name }
end
private_class_method :new
end
Version data entries
13 entries across 13 versions & 1 rubygems