public LilypondSequenceReader(string lilyContent)
{
string[] lilypondText = lilyContent.Split().Where(item => item.Length > 0).ToArray();
LilypondContext context = new LilypondContext();
Stack <LilypondSection> sections = new Stack <LilypondSection>();
LilypondSection rootSection = null;
for (int i = 0; i < lilypondText.Length; i++)
{
switch (lilypondText[i])
{
case "\\relative":
// New relative section start with a startPitch and an ocatveChange
RelativeExpression relativeExpression = new RelativeExpression(lilypondText[i + 1][0],
string.Concat(lilypondText[i + 1].Skip(1)));
sections.Push(relativeExpression);
if (rootSection == null)
{
rootSection = relativeExpression;
}
i += 2;
break;
case "\\repeat":
RepeatExpression repeatExpression = new RepeatExpression();
sections.Peek()?.ChildExpressions.Add(repeatExpression);
sections.Push(repeatExpression);
i += 3;
break;
case "\\alternative":
AlternativeExpression alternativeExpression = new AlternativeExpression();
sections.Peek()?.ChildExpressions.Add(alternativeExpression);
sections.Push(alternativeExpression);
context.InAlternative = true;
i++;
break;
case "\\clef":
sections.Peek().ChildExpressions.Add(new ClefExpression(lilypondText[i + 1]));
i++;
break;
case "\\tempo":
sections.Peek().ChildExpressions.Add(new TempoExpression(lilypondText[i + 1]));
i += 1;
break;
case "\\time":
sections.Peek().ChildExpressions.Add(new TimeSignatureExpression(lilypondText[i + 1]));
i++;
break;
case "{":
if (context.InAlternative)
{
// There is a new alternative group in the current alternative block
AlternativeGroupExpression alternativeGroup = new AlternativeGroupExpression();
sections.Peek()?.ChildExpressions.Add(alternativeGroup);
sections.Push(alternativeGroup);
context.InAlternativeGroup = true;
}
else
{
LilypondSection lilypondSection = new LilypondSection();
if (sections.Any())
{
sections.Peek()?.ChildExpressions.Add(lilypondSection);
sections.Push(lilypondSection);
}
}
break;
case "}": // Section has ended. It is no longer the current section, so pop it from the stack
if (context.InRepeat)
{
if (lilypondText[i + 1] != "\\alternative")
{
sections.Peek().ChildExpressions.Add(new BarlineExpression(true));
}
context.InRepeat = false;
}
if (sections.Any())
{
sections.Pop();
}
break;
case "|": sections.Peek().ChildExpressions.Add(new BarlineExpression()); break;
// It is a note or an unknown token
default:
try
{
sections.Peek().ChildExpressions.Add(new NoteExpression(lilypondText[i]));
break;
}
catch (Exception)
{
/* It is an unknown token, skip it. */ break;
}
}
}
rootSection.Interpret(context);
if (!context.ClefAdded)
{
context.Sequence.Symbols.Insert(0, new Clef(ClefType.GClef));
}
Sequence = context.Sequence;
}
public override bool Apply(AlternativeExpression expression, NormalizedCharSet param)
{
Invoke(expression.Left, param);
Invoke(expression.Right, param);
return(false);
}
