Class: LilypondConvertor

Inherits:
Object
  • Object
show all
Defined in:
lib/lygre/lilypondconvertor.rb

Constant Summary collapse

DEFAULT_SETTINGS =

true - print if given; false - ignore; ‘always’ - print even if empty

{
 version: true,
 notes: true,
 lyrics: true,
 header: true,
 cadenza: false
}
DEFAULT_CLEF = 
GabcClef.new(pitch: :c, line: 4, bemol: false)
BARS =

maps gabc divisiones to lilypond bars

{
 ':' => '\bar "|"',
 ';' => '\bar "|"',
 '::' => '\bar "||"',
 ',' => '\bar "\'"',
 '`' => '\breathe \bar ""'
}

Instance Method Summary collapse

Constructor Details

#initialize(settings = {}) ⇒ LilypondConvertor

Returns a new instance of LilypondConvertor.



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# File 'lib/lygre/lilypondconvertor.rb', line 25

def initialize(settings={})
  @settings = DEFAULT_SETTINGS.dup.update(settings)

  # todo: make it possible to freely choose absolute c _pitch_
  @c_pitch = NoteFactory["c''"]

  @lily_scale = [:c, :d, :e, :f, :g, :a, :b]
  @gabc_lines = ['', :d, :f, :h, :j]
end

Instance Method Details

#convert(score) ⇒ Object

converts GabcScore to Lilypond source



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# File 'lib/lygre/lilypondconvertor.rb', line 36

def convert(score)
  header = score.header.keys.sort.collect do |k|
    "    #{k} = \"#{score.header[k]}\""
  end.join "\n"

  notes = []
  lyrics = []

  clef = DEFAULT_CLEF
  @gabc_reader = GabcPitchReader.new clef.pitch, clef.line

  score.music.words.each_with_index do |word,i|
    current = word_notes(word, clef)
    if @settings[:cadenza] &&
       ! (notes.empty? || current.empty? ||
          notes.last.include?('\bar') || current.include?('\bar'))
      notes << '\bar ""'
    end
    notes << current unless current.empty?
    lyrics << word_lyrics(word)
  end

  r = ''

  r += "\\version \"2.16.0\"\n\n" if @settings[:version]
  r += "\\score {\n"

  if @settings[:notes] and
      (notes.size > 0 or @settings[:notes] == 'always') then
    r += "  \\absolute {\n"

    if @settings[:cadenza] then
      r += "    \\cadenzaOn\n"
    end

    r += "    #{notes.join(" ")}\n" +
      "  }\n"
  end

  if @settings[:lyrics] and
      (lyrics.size > 0 or @settings[:lyrics] == 'always') then
    r += "  \\addlyrics {\n" +
      "    #{lyrics.join(" ")}\n" +
      "  }\n"
  end

  if @settings[:header] and
      (header.size > 0 or @settings[:header] == 'always') then
    r += "  \\header {\n" +
      "#{header}\n" +
      "  }\n"
  end

  r += "}\n"

  return r
end

#convert_min(score) ⇒ Object

returns the output of #convert ‘minimized’, with whitespace reduced and normalized (useful for testing)



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# File 'lib/lygre/lilypondconvertor.rb', line 96

def convert_min(score)
  convert(score).gsub(/\s+/, ' ').strip
end

#melisma(notes) ⇒ Object

makes a melisma from a group of notes



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# File 'lib/lygre/lilypondconvertor.rb', line 101

def melisma(notes)
  notes[0] = (notes[0].to_s + '(').to_sym
  notes[-1] = (notes[-1].to_s + ')').to_sym
  return notes
end

#word_lyrics(word) ⇒ Object 



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# File 'lib/lygre/lilypondconvertor.rb', line 145

def word_lyrics(word)
  word.collect do |syll|
    l = syll.lyrics

    if syll.lyrics.start_with? '*' then
      l = '"' + syll.lyrics + '"'
    end

    if syll.lyrics.include? '<' then
      l = syll.lyrics.gsub(/<i>([^<]+)<\/i>/) do |m|
        '\italic{' + $1 + '}'
      end
      l = '\markup{'+l+'}'
    end

    if syll.notes.size == 1 and
        syll.notes.first.is_a? GabcDivisio and
        syll.lyrics.size > 0 then

      unless l.start_with? '\markup'
        l = '\markup{'+l+'}'
      end
      l = '\set stanza = '+l
    end

    l
  end.join ' -- '
end

#word_notes(word, clef) ⇒ Object 



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# File 'lib/lygre/lilypondconvertor.rb', line 107

def word_notes(word, clef)
  r = []
  word.each_syllable do |syl|
    notes = syl.notes

    if notes.empty? then
      r << 's'
    else
      sylnotes = []
      notes.each do |n|
        if n.is_a? GabcNote then
          pitch = @gabc_reader.pitch(n.pitch)
          sylnotes << NoteFactory.lily_abs_pitch(pitch)
        elsif n.is_a? GabcDivisio then
          divisio = n.type
          unless BARS.has_key? divisio
            raise RuntimeError.new "Unhandled bar type '#{n.type}'"
          end

          sylnotes << BARS[divisio].dup

        elsif n.is_a? GabcClef then
          @gabc_reader = GabcPitchReader.new n.pitch, n.line

        else
          raise RuntimeError.new "Unknown music content #{n}"
        end
      end

      if notes.size >= 2 then
        sylnotes = melisma sylnotes
      end
      r += sylnotes
    end
  end
  return r.join ' '
end