Class: RubySketch::MML

Inherits:
Object
  • Object
show all
Defined in:
lib/rubysketch/mml.rb

Constant Summary collapse

TONES = 
%i[
  sine triangle square sawtooth pulse12_5 pulse25 noise
].freeze

Class Method Summary collapse

Class Method Details

.compile(str, streaming = false) ⇒ Object 



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# File 'lib/rubysketch/mml.rb', line 12

def compile(str, streaming = false)
  seq, duration = compile! str
  Sound.new Beeps::Sound.new(seq, streaming ? 0 : duration)
end

.compile!(str) ⇒ Object 



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# File 'lib/rubysketch/mml.rb', line 17

def compile!(str)
  scanner = StringScanner.new expandLoops__ str.gsub(/[;%].*(?:\n|$)/, '')
  seq     = Beeps::Sequencer.new
  note    = Note__.new
  pending = nil
  prevOsc = nil

  scanner.skip(/\s*/)
  until scanner.eos?
    case
    when scanner.scan(/T\s*(\d+)/i)
      note.bpm         = scanner[1].to_i
    when scanner.scan(/O\s*(\d+)/i)
      note.octave      = scanner[1].to_i
    when scanner.scan(/([<>])/)
      note.octave     +=
        case scanner[1]
        when '<' then -1
        when '>' then +1
        else           0
        end
    when scanner.scan(/@\s*(\d+)/)
      note.tone        = scanner[1].to_i
    when scanner.scan(/L\s*(\d+)/i)
      note.length      = scanner[1].to_i
    when scanner.scan(/V\s*(\d+)/i)
      note.velocity    = scanner[1].to_i
    when scanner.scan(/Q\s*(\d+)/i)
      note.quantize    = scanner[1].to_i
    when scanner.scan(/K\s*([+-]?\d+)/i)
      note.transpose   = scanner[1].to_i
    when scanner.scan(/Y\s*([+-]?\d+)/i)
      note.detune      = scanner[1].to_i
    when scanner.scan(/\&\s*(\d+)?\s*(\.+)?/)
      len, dots        = [1, 2].map {scanner[_1]}
      if len || dots
        pending.seconds += seconds__ note, len&.to_i, dots&.size if pending
      else
        note.tie       = true
      end
    when scanner.scan(/\^\s*(\d+)?\s*(\.+)?/)
      len, dots        = [1, 2].map {scanner[_1]}
      pending.seconds += seconds__ note, len&.to_i, dots&.size if pending
    when scanner.scan(/_/)
      note.portamento  = true
    when scanner.scan(/R\s*(\d+)?\s*(\.+)?/i)
      len, dots        = [1, 2].map {scanner[_1]}
      note.clearLegatoFlags
      addNote__ seq, pending, note, prevOsc if pending
      pending          = nil
      prevOsc          = nil
      note.time       += seconds__ note, len&.to_i, dots&.size
    when scanner.scan(/([CDEFGAB])\s*([#+-]+)?\s*(\d+)?\s*(\.+)?/i)&.chomp
      char, offset, len, dots = [1, 2, 3, 4].map {scanner[_1]}

      note.frequency   = frequency__ note, char, offset
      prevOsc          = addNote__ seq, pending, note, prevOsc if pending

      pending          = note.dup
      pending.seconds += seconds__ note, len&.to_i, dots&.size

      note.clearLegatoFlags
    else
      raise "Unknown input: #{scanner.rest[..10]}"
    end

    scanner.skip(/\s*/)
  end

  addNote__ seq, pending, note, prevOsc if pending
  return seq, note.time
end

.play(str) ⇒ Object 



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# File 'lib/rubysketch/mml.rb', line 90

def play(str)
  compile(str).play
end