/// <summary>
/// Converts the string representation of a chord progression to its <see cref="ChordProgression"/> equivalent.
/// A return value indicates whether the conversion succeeded.
/// </summary>
/// <param name="input">A string containing a chord progression to convert.</param>
/// <param name="scale">Scale to resolve chords.</param>
/// <param name="chordProgression">When this method returns, contains the <see cref="ChordProgression"/>
/// equivalent of the chord progression 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, Scale scale, out ChordProgression chordProgression)
{
return(ParsingUtilities.TryParse(input, GetParsing(input, scale), out chordProgression));
}
/// <summary>
/// Converts the string representation of a chord progression to its <see cref="ChordProgression"/> equivalent.
/// </summary>
/// <param name="input">A string containing a chord progression to convert.</param>
/// <param name="scale">Scale to resolve chords.</param>
/// <returns>A <see cref="ChordProgression"/> equivalent to the chord progression contained in
/// <paramref name="input"/>.</returns>
/// <exception cref="ArgumentException"><paramref name="input"/> is null or contains white-spaces only.</exception>
/// <exception cref="FormatException"><paramref name="input"/> has invalid format.</exception>
public static ChordProgression Parse(string input, Scale scale)
{
return(ParsingUtilities.Parse(input, GetParsing(input, scale)));
}
internal static ParsingResult TryParse(string input, out Scale scale)
{
scale = null;
if (string.IsNullOrWhiteSpace(input))
{
return(ParsingResult.EmptyInputString);
}
var match = ParsingUtilities.Match(input, Patterns);
if (match == null)
{
return(ParsingResult.NotMatched);
}
var rootNoteNameGroup = match.Groups[RootNoteNameGroupName];
NoteName rootNoteName;
var rootNoteNameParsingResult = NoteNameParser.TryParse(rootNoteNameGroup.Value, out rootNoteName);
if (rootNoteNameParsingResult.Status != ParsingStatus.Parsed)
{
return(rootNoteNameParsingResult);
}
//
IEnumerable <Interval> intervals = null;
var intervalGroup = match.Groups[IntervalGroupName];
if (intervalGroup.Success)
{
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);
}
intervals = intervalsParsingResults.Select(r => r.Interval).ToArray();
}
else
{
var intervalsMnemonicGroup = match.Groups[IntervalsMnemonicGroupName];
var intervalsName = intervalsMnemonicGroup.Value;
intervals = ScaleIntervals.GetByName(intervalsName);
}
if (intervals == null)
{
return(ParsingResult.Error(ScaleIsUnknown));
}
//
scale = new Scale(intervals, rootNoteName);
return(ParsingResult.Parsed);
}
