private static void Diagram(
this StringBuilder builder,
SymbolResult symbolResult,
ParseResult parseResult)
{
if (parseResult.Errors.Any(e => e.SymbolResult == symbolResult))
{
builder.Append("!");
}
if (symbolResult is OptionResult option &&
option.IsImplicit)
{
builder.Append("*");
}
builder.Append("[ ");
builder.Append(symbolResult.Token);
foreach (var child in symbolResult.Children)
{
builder.Append(" ");
builder.Diagram(child, parseResult);
}
if (symbolResult.Arguments.Count > 0)
{
foreach (var arg in symbolResult.Arguments)
{
builder.Append(" <");
builder.Append(arg);
builder.Append(">");
}
}
else
{
var result = symbolResult.ArgumentResult;
if (result is SuccessfulArgumentResult _)
{
var value = symbolResult.GetValueOrDefault();
switch (value)
{
case null:
case IReadOnlyCollection <string> a when a.Count == 0:
break;
default:
builder.Append(" <");
builder.Append(value);
builder.Append(">");
break;
}
}
}
builder.Append(" ]");
}
public static object GetValueOrDefault(this SymbolResult symbolResult)
{
return(symbolResult.GetValueOrDefault <object>());
}