internal static ParsingResult TryParse(string input, Scale scale, out ChordProgression chordProgression)
{
chordProgression = null;
if (string.IsNullOrWhiteSpace(input))
{
return(ParsingResult.EmptyInputString);
}
var matches = ParsingUtilities.Matches(input, Patterns, ignoreCase: false);
if (matches == null)
{
return(ParsingResult.NotMatched);
}
var chords = new List <Chord>();
foreach (var match in matches)
{
var degreeGroup = match.Groups[ScaleDegreeGroupName];
var degreeRoman = degreeGroup.Value.ToLower();
if (string.IsNullOrWhiteSpace(degreeRoman))
{
continue;
}
var degree = RomanToInteger(degreeRoman);
var rootNoteName = scale.GetStep(degree - 1);
var fullString = match.Value;
var matchIndex = match.Index;
var degreeGroupIndex = degreeGroup.Index;
var chordString =
fullString.Substring(0, degreeGroupIndex - matchIndex) +
rootNoteName +
fullString.Substring(degreeGroupIndex - matchIndex + degreeGroup.Length);
Chord chord;
var chordParsingResult = ChordParser.TryParse(chordString, out chord);
if (chordParsingResult.Status != ParsingStatus.Parsed)
{
return(chordParsingResult);
}
chords.Add(chord);
}
chordProgression = new ChordProgression(chords);
return(ParsingResult.Parsed);
}
/// <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 <c>null</c> if the conversion failed. The conversion fails if the <paramref name="input"/> is <c>null</c> 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><c>true</c> if <paramref name="input"/> was converted successfully; otherwise, <c>false</c>.</returns>
public static bool TryParse(string input, Scale scale, out ChordProgression chordProgression)
{
return(ParsingUtilities.TryParse(input, GetParsing(input, scale), out chordProgression));
}
