public static IEnumerable <Interval> GetIntervalsBetweenNotes(this Chord chord)
{
ThrowIfArgument.IsNull(nameof(chord), chord);
return(GetIntervals(chord).Select(i => Interval.FromHalfSteps(i)).ToList());
}
/// <summary>
/// Gets intervals from the root note of the specified chord. For example, +4 and +7 for C major
/// (+4 for C and E, +7 for C and G).
/// </summary>
/// <param name="chord">Chord to get intervals from root note.</param>
/// <returns>Intervals from the root note of the <paramref name="chord"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="chord"/> is <c>null</c>.</exception>
/// <exception cref="InvalidOperationException">Some intervals are greater than <see cref="SevenBitNumber.MaxValue"/>.</exception>
public static IEnumerable <Interval> GetIntervalsFromRootNote(this Chord chord)
{
ThrowIfArgument.IsNull(nameof(chord), chord);
return(GetIntervalsFromRootNote(chord.NotesNames));
}
private static IEnumerable <SevenBitNumber> GetIntervals(Chord chord)
{
return(GetIntervals(chord.NotesNames));
}
/// <summary>
/// Converts the string representation of a musical chord to its <see cref="Chord"/> equivalent.
/// A return value indicates whether the conversion succeeded.
/// </summary>
/// <param name="input">A string containing a chord to convert.</param>
/// <param name="chord">When this method returns, contains the <see cref="Chord"/>
/// equivalent of the musical chord contained in <paramref name="input"/>, if the conversion succeeded,
/// or null if the conversion failed. The conversion fails if the <paramref name="input"/> is null or
/// <see cref="string.Empty"/>, or is not of the correct format. This parameter is passed uninitialized;
/// any value originally supplied in result will be overwritten.</param>
/// <returns>true if <paramref name="input"/> was converted successfully; otherwise, false.</returns>
public static bool TryParse(string input, out Chord chord)
{
return(ParsingUtilities.TryParse(input, ChordParser.TryParse, out chord));
}
private static ParsingResult TryParseChordIntervals(Match match, NoteName rootNoteName, out Chord chord)
{
chord = null;
var intervalGroup = match.Groups[IntervalGroupName];
var intervalsParsingResults = intervalGroup
.Captures
.OfType <Capture>()
.Select(c =>
{
Interval interval;
var parsingResult = IntervalParser.TryParse(c.Value, out interval);
return(new
{
Interval = interval,
ParsingResult = parsingResult
});
})
.ToArray();
var notParsedResult = intervalsParsingResults.FirstOrDefault(r => r.ParsingResult.Status != ParsingStatus.Parsed);
if (notParsedResult != null)
{
return(notParsedResult.ParsingResult);
}
var intervals = intervalsParsingResults.Select(r => r.Interval).ToArray();
chord = new Chord(rootNoteName, intervals);
return(ParsingResult.Parsed);
}
internal static ParsingResult TryParseChordName(Match match, NoteName rootNoteName, out Chord chord)
{
chord = null;
//
Quality?quality = null;
var qualityGroup = match.Groups[ChordQualityGroupName];
if (qualityGroup.Success)
{
quality = GroupsQualities.FirstOrDefault(gq => match.Groups[gq.Key].Success).Value;
}
//
var extensionIntervalNumber = -1;
IntervalQuality?extensionIntervalQuality = null;
var extensionGroup = match.Groups[ExtensionGroupName];
if (extensionGroup.Success && !string.IsNullOrWhiteSpace(extensionGroup.Value))
{
if (match.Groups[ExtensionQualityGroupName].Success)
{
extensionIntervalQuality = GroupsExtensionQualities.FirstOrDefault(gq => match.Groups[gq.Key].Success).Value;
}
if (!ParsingUtilities.ParseInt(match, ExtensionNumberGroupName, -1, out extensionIntervalNumber) ||
extensionIntervalNumber < 5)
{
return(ParsingResult.Error(ExtensionNumberIsOutOfRange));
}
}
if (quality == Quality.HalfDiminished || quality == Quality.Dominant)
{
if (extensionIntervalNumber >= 0 && extensionIntervalNumber != 7)
{
return(ParsingResult.Error(HalfDiminishedOrDominantIsNotSeventh));
}
if (extensionIntervalNumber < 0)
{
extensionIntervalNumber = 7;
}
}
var extensionNotes = new List <NoteName>();
var extensionNumbers = new List <int>();
if (extensionIntervalNumber >= 0)
{
var extensionNotesDictionary = GetExtensionNotes(quality, rootNoteName, extensionIntervalNumber, extensionIntervalQuality);
extensionNotes.AddRange(extensionNotesDictionary.Keys);
extensionNumbers.AddRange(extensionNotesDictionary.Values);
}
if (quality == Quality.HalfDiminished)
{
quality = Quality.Diminished;
}
else if (quality == Quality.Dominant)
{
quality = Quality.Major;
}
if (quality == null)
{
quality = Quality.Major;
}
//
var notes = new List <NoteName>(Chord.GetByTriad(rootNoteName, ChordQualities[quality.Value]).NotesNames);
notes.AddRange(extensionNotes);
extensionNumbers.InsertRange(0, new[] { 1, 3, 5 });
if (extensionIntervalNumber == 5)
{
notes.Clear();
notes.AddRange(new[] { rootNoteName, extensionNotes.First() });
extensionNumbers.Clear();
extensionNumbers.AddRange(new[] { 1, 5 });
}
//
var alteredToneGroup = match.Groups[AlteredToneGroupName];
if (alteredToneGroup.Success)
{
int alteredToneNumber;
if (!ParsingUtilities.ParseInt(match, AlteredToneNumberGroupName, -1, out alteredToneNumber))
{
return(ParsingResult.Error(AlteredToneNumberIsOutOfRange));
}
var transposeBy = 0;
var accidental = match.Groups[AlteredToneAccidentalGroupName].Value;
switch (accidental)
{
case "#":
case "+":
transposeBy = 1;
break;
case "b":
case "-":
transposeBy = -1;
break;
}
var maxExtensionNumber = extensionNumbers.Max();
if (maxExtensionNumber < alteredToneNumber)
{
var extensionNotesDictionary = GetExtensionNotes(quality, rootNoteName, alteredToneNumber, null)
.Where(kv => kv.Value > maxExtensionNumber);
notes.AddRange(extensionNotesDictionary.Select(kv => kv.Key));
extensionNumbers.AddRange(extensionNotesDictionary.Select(kv => kv.Value));
}
var index = extensionNumbers.IndexOf(alteredToneNumber);
if (index >= 0)
{
notes[index] = notes[index].Transpose(Interval.FromHalfSteps(transposeBy));
}
}
//
var suspendedGroup = match.Groups[SuspendedGroupName];
if (suspendedGroup.Success)
{
int suspensionNumber;
if (!ParsingUtilities.ParseInt(match, SuspendedNumberGroupName, -1, out suspensionNumber) ||
suspensionNumber != 2 && suspensionNumber != 4)
{
return(ParsingResult.Error(SuspensionNumberIsOutOfRange));
}
var interval = suspensionNumber == 2
? Interval.Get(IntervalQuality.Major, 2)
: Interval.Get(IntervalQuality.Perfect, 4);
notes[1] = rootNoteName.Transpose(interval);
}
//
var addedToneGroup = match.Groups[AddedToneGroupName];
if (addedToneGroup.Success)
{
int addedToneNumber;
if (!ParsingUtilities.ParseInt(match, AddedToneNumberGroupName, -1, out addedToneNumber))
{
return(ParsingResult.Error(AddedToneNumberIsOutOfRange));
}
var interval = Interval.IsPerfect(addedToneNumber)
? Interval.Get(IntervalQuality.Perfect, addedToneNumber)
: Interval.Get(IntervalQuality.Major, addedToneNumber);
notes.Add(rootNoteName.Transpose(interval));
}
//
var bassNoteNameGroup = match.Groups[BassNoteNameGroupName];
if (bassNoteNameGroup.Success)
{
NoteName bassNoteName;
var bassNoteNameParsingResult = NoteNameParser.TryParse(bassNoteNameGroup.Value, out bassNoteName);
if (bassNoteNameParsingResult.Status != ParsingStatus.Parsed)
{
return(bassNoteNameParsingResult);
}
notes.Insert(0, bassNoteName);
}
//
chord = new Chord(notes);
return(ParsingResult.Parsed);
}
