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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)
case starting_quality
when :perfect
PERFECT_INTERVAL_MODIFICATION[delta].to_s.gsub(/_+/, " ")
when :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
9 entries across 9 versions & 1 rubygems