/// <summary>
/// Creates a balanced group.
/// </summary>
/// <param name="current">The name to store the result in.</param>
/// <param name="previous">The starting group name to replace.</param>
/// <param name="options">The sub-expressions appearing in the group.</param>
/// <param name="options">The balance group options to use -or- null, if no options are provided.</param>
/// <returns>The balance group.</returns>
public static IBalancedGroup From(string current, string previous, BalanceGroupOptions options, IEnumerable <IExpression> members)
{
if (String.IsNullOrWhiteSpace(current))
{
current = null;
}
ValidateCaptureGroupName(nameof(current), current);
if (String.IsNullOrWhiteSpace(previous))
{
throw new ArgumentException(Resources.PreviousGroupNameBlank, nameof(previous));
}
ValidateCaptureGroupName(nameof(previous), previous);
var group = new BalancedGroup()
{
Current = current,
Previous = previous,
UseQuotes = options?.UseQuotes ?? false
};
foreach (var member in members)
{
group.Add(member);
}
return(group);
}
private IGroup ParseCaptureGroupOrBalanceGroup(string name, bool useQuotes)
{
var names = name.Split(new[] { '-' }, 2);
if (names.Length == 1)
{
return(ParseCaptureGroup(name, useQuotes));
}
var(current, previous) = (names[0], names[1]);
RegisterGroupName(current);
var options = new BalanceGroupOptions()
{
UseQuotes = useQuotes
};
var item = Parse();
return(BalancedGroup.Of(current, previous, options, item));
}
