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#--
# This file is part of Sonic Pi: http://sonic-pi.net
# Full project source: https://github.com/samaaron/sonic-pi
# License: https://github.com/samaaron/sonic-pi/blob/master/LICENSE.md
#
# Copyright 2013, 2014, 2015, 2016 by Sam Aaron (http://sam.aaron.name).
# All rights reserved.
#
# Permission is granted for use, copying, modification, and
# distribution of modified versions of this work as long as this
# notice is included.
#++
module SonicPi
class Note
class InvalidNoteError < ArgumentError ; end ;
class InvalidOctaveError < ArgumentError ; end ;
NOTES_TO_INTERVALS =
{cf: -1, CF: -1, Cf: -1, cF: -1,
cb: -1, CB: -1, Cb: -1, cB: -1,
c: 0, C: 0,
cs: 1, CS: 1, cS: 1, Cs: 1,
df: 1, DF: 1, Df: 1, dF: 1,
db: 1, DB: 1, Db: 1, dB: 1,
d: 2, D: 2,
eb: 3, EB: 3, Eb: 3, eB: 3,
ef: 3, EF: 3, Ef: 3, eF: 3,
ds: 3, DS: 3, Ds: 3, dS: 3,
e: 4, E: 4,
fb: 4, FB: 4, Fb: 4, fB: 4,
ff: 4, FF: 4, Ff: 4, fF: 4,
f: 5, F: 5,
es: 5, ES: 5, Es: 5, eS: 5,
fs: 6, FS: 6, Fs: 6, fS: 6,
gb: 6, GB: 6, Gb: 6, gB: 6,
gf: 6, GF: 6, Gf: 6, gF: 6,
g: 7, G: 7,
gs: 8, GS: 8, Gs: 8, gS: 8,
ab: 8, AB: 8, Ab: 8, aB: 8,
af: 8, AF: 8, Af: 8, aF: 8,
a: 9, A: 9,
bb: 10, BB: 10, Bb: 10, bB: 10,
bf: 10, BF: 10, Bf: 10, bF: 10,
as: 10, AS: 10, As: 10, aS: 10,
b: 11, B: 11,
bs: 12, BS: 12, Bs: 12, bS: 12}
INTERVALS_TO_NOTES = {
0 => :C,
1 => :Cs,
2 => :D,
3 => :Eb,
4 => :E,
5 => :F,
6 => :Fs,
7 => :G,
8 => :Ab,
9 => :A,
10 => :Bb,
11 => :B}
DEFAULT_OCTAVE = 4
MIDI_NOTE_RE = /\A:?(([a-gA-G])([sSbBfF]?))([-]?[0-9]*)\Z/
@@notes_cache = Hash.new
@@midi_string_cache = Hash.new {|h, k| h[k] = Hash.new }
@@midi_to_note_cache = Hash.new
def self.resolve_note(n, o=nil)
raise Exception.new("resolve_note argument must be a valid note. Got nil.") if(n.nil?)
n_key = n.is_a?(String) ? n.to_sym : n
return @@midi_to_note_cache[@@midi_string_cache[n_key][o]] if @@midi_string_cache[n_key][o]
note = self.new(n_key, o)
case n_key
when Numeric
@@midi_string_cache[n_key][o] = note.midi_string
else
n_key = n.to_s
downcase = n_key.downcase
[n_key.upcase.to_sym, downcase.to_sym, downcase.capitalize.to_sym].each do |key|
@@midi_string_cache[key][o] = note.midi_string
end
end
@@midi_to_note_cache[note.midi_string] = note unless @@midi_to_note_cache.has_key?(note.midi_string)
note
end
def self.resolve_midi_note_without_octave(n)
return @@notes_cache[n] if @@notes_cache[n]
note = case n
when Symbol, String
self.resolve_note(n).midi_note
when NilClass
nil
when Numeric
#don't cache numbers
#short-circuit and return
return n
end
@@notes_cache[n] = note
note
end
def self.resolve_midi_note(n, o=nil)
return resolve_midi_note_without_octave(n) unless o
n = resolve_midi_note_without_octave(n)
raise InvalidOctaveError, "Invalid octave: #{o.inspect}, expecting a number" unless o.is_a? Numeric
n = n % 12
o = o.to_i * 12
n + o + 12
end
def self.resolve_note_name(n, o=nil)
note = resolve_midi_note(n, o)
note = note.to_i % 12
INTERVALS_TO_NOTES[note]
end
attr_reader :pitch_class, :octave, :interval, :midi_note, :midi_string
def initialize(n, o=nil)
if n.is_a? Numeric
o = (n / 12).to_i - 1
n = n % 12
n = Note.resolve_note_name(n.to_f)
end
orig_n = n
n = n.to_s
m = MIDI_NOTE_RE.match n
raise InvalidNoteError, "Invalid note: #{orig_n.inspect}" unless m
@pitch_class = "#{m[2].capitalize}#{unify_sharp_flat_modifier(m[3])}".to_sym
if o
raise InvalidOctaveError, "Invalid octave: #{o.inspect}, expecting a whole number such as 3 or 4!" unless o.is_a? Integer
@octave = o.to_i
else
@octave = m[4].empty? ? DEFAULT_OCTAVE : m[4].to_i
end
@interval = NOTES_TO_INTERVALS[m[1].downcase.to_sym]
raise InvalidNoteError, "Invalid note: #{orig_n.inspect}" unless @interval
@midi_note = (@octave * 12) + @interval + 12
@midi_string = "#{@pitch_class.capitalize}#{@octave}"
end
def to_h
{:pitch_class => @pitch_class, :octave => @octave, :interval => @interval, :midi_note => @midi_note, :midi_string => @midi_string}
end
def to_s
"#<SonicPi::Note :#{@midi_string}>"
end
def inspect
to_s
end
private
def unify_sharp_flat_modifier(mod)
m = mod.downcase
return "b" if m == "f"
m
end
end
end
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