/// <summary>
/// Initializes a new instance of the <see cref="Octave"/> with the
/// specified octave number.
/// </summary>
/// <param name="octave">The number of an octave.</param>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="octave"/> is out of valid range.</exception>
private Octave(int octave)
{
Debug.Assert(octave >= MinOctaveNumber && octave <= MaxOctaveNumber,
"An octave's number is out of range.");
Number = octave;
_notes = Enum.GetValues(typeof(NoteName))
.Cast <NoteName>()
.Where(n => NoteUtilities.IsNoteValid(n, octave))
.ToDictionary(n => n,
n => Note.Get(n, octave));
}
internal static ParsingResult TryParse(string input, out Note note)
{
note = null;
if (string.IsNullOrWhiteSpace(input))
{
return(ParsingResult.EmptyInputString);
}
var match = ParsingUtilities.Match(input, Patterns);
if (match == null)
{
return(ParsingResult.NotMatched);
}
var noteNameGroup = match.Groups[NoteNameGroupName];
NoteName noteName;
var noteNameParsingResult = NoteNameParser.TryParse(noteNameGroup.Value, out noteName);
if (noteNameParsingResult.Status != ParsingStatus.Parsed)
{
return(noteNameParsingResult);
}
int octaveNumber;
if (!ParsingUtilities.ParseInt(match, OctaveGroupName, Octave.Middle.Number, out octaveNumber))
{
return(ParsingResult.Error(OctaveIsOutOfRange));
}
if (!NoteUtilities.IsNoteValid(noteName, octaveNumber))
{
return(ParsingResult.Error(NoteIsOutOfRange));
}
note = Note.Get(noteName, octaveNumber);
return(ParsingResult.Parsed);
}
/// <summary>
/// Gets all notes that belong to a musical scale.
/// </summary>
/// <param name="scale"><see cref="Scale"/> to get notes of.</param>
/// <returns>Notes that belong to the <paramref name="scale"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="scale"/> is null.</exception>
public static IEnumerable <Note> GetNotes(this Scale scale)
{
ThrowIfArgument.IsNull(nameof(scale), scale);
int noteNumber = SevenBitNumber.Values
.SkipWhile(number => NoteUtilities.GetNoteName(number) != scale.RootNote)
.First();
yield return(Note.Get((SevenBitNumber)noteNumber));
while (true)
{
foreach (var interval in scale.Intervals)
{
noteNumber += interval;
if (!NoteUtilities.IsNoteNumberValid(noteNumber))
{
yield break;
}
yield return(Note.Get((SevenBitNumber)noteNumber));
}
}
}