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Contents
# frozen_string_literal: true
# Module for style guidelines.
module HeadMusic::Style::Guidelines; end
# A counterpoint guideline
class HeadMusic::Style::Guidelines::NotesSameLength < HeadMusic::Style::Annotation
MESSAGE = 'Use consistent rhythmic unit.'
def marks
HeadMusic::Style::Mark.for_each(all_wrong_length_notes)
end
private
def all_wrong_length_notes
(wrong_length_notes + [wrong_length_last_note]).compact
end
def wrong_length_notes
all_but_last_note.reject do |note|
note.rhythmic_value == first_most_common_rhythmic_value
end
end
def wrong_length_last_note
last_note unless acceptable_duration_of_last_note?
end
def acceptable_duration_of_last_note?
last_note.nil? ||
[
first_most_common_rhythmic_value.total_value,
first_most_common_rhythmic_value.total_value * 2,
].include?(last_note.rhythmic_value.total_value)
end
def all_but_last_note
notes[0..-2]
end
def distinct_values
all_but_last_note.map(&:rhythmic_value).uniq.length
end
def first_most_common_rhythmic_value
@first_most_common_rhythmic_value ||= begin
candidates = most_common_rhythmic_values
first_match = notes.detect { |note| candidates.include?(note.rhythmic_value) }
first_match ? first_match.rhythmic_value : nil
end
end
def most_common_rhythmic_values
return [] if notes.empty?
occurrences = occurrences_by_rhythmic_value
highest_count = occurrences.values.max
occurrences.select { |_rhythmic_value, count| count == highest_count }.keys
end
def occurrences_by_rhythmic_value
rhythmic_values.each_with_object(Hash.new(0)) { |value, hash| hash[value] += 1; }
end
def rhythmic_values
notes.map(&:rhythmic_value)
end
end
Version data entries
18 entries across 18 versions & 1 rubygems