public static IEnumerable <Expression> Iterate(ISet <Expression> visitedExpressions, Expression expressionToIterate)
{
BinaryUnion binaryUnion = expressionToIterate.As <BinaryUnion>();
if (binaryUnion != null)
{
foreach (Expression expression in Iterate(visitedExpressions, binaryUnion.Left.AsSequence().Concat(binaryUnion.Right)))
{
if (visitedExpressions.Add(expression))
{
yield return(expression);
}
}
yield break;
}
Union union = expressionToIterate.As <Union>();
if (union != null)
{
foreach (Expression expression in Iterate(visitedExpressions, union.Expressions))
{
if (visitedExpressions.Add(expression))
{
yield return(expression);
}
}
yield break;
}
yield return(expressionToIterate);
}
public override Expression ToRegExp()
{
Entity prev = null;
Expression expression = null;
foreach (Entity entity in EntityCollection)
{
if (prev == null)
{
expression = entity.ToRegExp();
}
else
{
expression = new RegExpBinaryUnion(expression, entity.ToRegExp());
}
prev = entity;
}
return(expression);
}