private readonly List <int> _rules; // negative -> group #, positive -> string #
/// <summary>
/// Since RegexReplacement shares the same parser as Regex,
/// the constructor takes a RegexNode which is a concatenation
/// of constant strings and backreferences.
/// </summary>
internal RegexReplacement(string rep, RegexNode concat, Hashtable _caps)
{
if (concat.Type() != RegexNode.Concatenate)
{
throw new ArgumentException("");
}
StringBuilder sb = StringBuilderCache.Acquire();
List <string> strings = new List <string>();
List <int> rules = new List <int>();
for (int i = 0; i < concat.ChildCount(); i++)
{
RegexNode child = concat.Child(i);
switch (child.Type())
{
case RegexNode.Multi:
sb.Append(child._str);
break;
case RegexNode.One:
sb.Append(child._ch);
break;
case RegexNode.Ref:
if (sb.Length > 0)
{
rules.Add(strings.Count);
strings.Add(sb.ToString());
sb.Length = 0;
}
int slot = child._m;
if (_caps != null && slot >= 0)
{
slot = (int)_caps[slot];
}
rules.Add(-Specials - 1 - slot);
break;
default:
throw new ArgumentException("");
}
}
if (sb.Length > 0)
{
rules.Add(strings.Count);
strings.Add(sb.ToString());
}
StringBuilderCache.Release(sb);
_rep = rep;
_strings = strings;
_rules = rules;
}
