/// <summary>
/// Add an existing <see cref="RegexPositiveLookaheadAssertionNode"/> to the generator.
/// </summary>
/// <param name="group"><see cref="RegexPositiveLookaheadAssertionNode"/> to be added.</param>
/// <returns><see cref="RegexGenerator"/></returns>
/// <exception cref="PositiveLookaheadAssertionNotSupportedException">Positive lookahead assertion is not supported by <see cref="RegexLanguage"/>.</exception>
public RegexGenerator AddPositiveLookaheadAssertion(RegexPositiveLookaheadAssertionNode positiveLookaheadAssertion)
{
if (!IsPositiveLookaheadAssertionSupported)
{
throw new PositiveLookaheadAssertionNotSupportedException(RegexLanguage);
}
return(Add(positiveLookaheadAssertion));
}
public virtual string ToPositiveLookaheadAssertionString(RegexPositiveLookaheadAssertionNode positiveLookaheadAssertion)
{
if (!IsPositiveLookaheadAssertionSupported)
{
throw new PositiveLookaheadAssertionNotSupportedException(RegexLanguage);
}
if (positiveLookaheadAssertion == null)
{
throw new ArgumentNullException(nameof(positiveLookaheadAssertion));
}
var sb = new StringBuilder();
sb.Append(ToTokenString(RegexToken.PositiveLookaheadAssertionOpen))
.Append(positiveLookaheadAssertion.IsInnerNodeIncluded ? ToString(positiveLookaheadAssertion.InnerNode) : positiveLookaheadAssertion.Pattern)
.Append(ToTokenString(RegexToken.PositiveLookaheadAssertionClose));
return(AddQuantifier(sb.ToString(), positiveLookaheadAssertion.Minimum, positiveLookaheadAssertion.Maximum, positiveLookaheadAssertion.RegexQuantifierOption));
}
/// <summary>
/// Create and add <see cref="RegexPositiveLookaheadAssertionNode"/> to the generator, and include another <see cref="RegexNode"/> inside.
/// </summary>
/// <param name="innerNode">An existing <see cref="RegexNode"/> to be included.</param>
/// <param name="min">Optional minimum number of occurance.</param>
/// <param name="max">Optional maximum number of occurance.</param>
/// <param name="quantifierOption">Optional quantifier option.</param>
/// <returns><see cref="RegexGenerator"/></returns>
/// <exception cref="PositiveLookaheadAssertionNotSupportedException">Positive lookahead assertion is not supported by <see cref="RegexLanguage"/>.</exception>
public RegexGenerator AddPositiveLookaheadAssertion(RegexNode innerNode, int?min = null, int?max = null, RegexQuantifierOption quantifierOption = RegexQuantifierOption.Greedy)
{
var positiveLookaheadAssertion = new RegexPositiveLookaheadAssertionNode(innerNode, min, max, quantifierOption);
return(AddPositiveLookaheadAssertion(positiveLookaheadAssertion));
}
