internal static void rb_str_subpat_set(String str, Regexp re, int nth, object val, Frame caller)
{
Match match;
int start, len;
if (re.rb_reg_search(str, 0, false, caller) < 0)
{
throw new IndexError("regexp not matched").raise(caller);
}
match = Regexp.rb_backref_get(caller);
if (nth >= match.value.Groups.Count)
{
throw new IndexError(string.Format(CultureInfo.InvariantCulture, "index {0} out of regexp", nth)).raise(caller);
}
if (nth < 0)
{
if (-nth >= match.value.Groups.Count)
{
throw new IndexError(string.Format(CultureInfo.InvariantCulture, "index {0} out of regexp", nth)).raise(caller);
}
nth += match.value.Groups.Count;
}
start = match.value.Groups[nth].Index;
if (start == -1)
{
throw new IndexError(string.Format(CultureInfo.InvariantCulture, "regexp group {0} not matched", nth)).raise(caller);
}
len = match.value.Groups[nth].Length;
rb_str_splice(caller, str, start, len, val);
}
private object scan_once(String str, Regexp pat, ref int start, Frame caller)
{
Match match;
if (pat.rb_reg_search(str, start, false, caller) >= 0)
{
match = Regexp.rb_backref_get(caller);
if (match.value.Length == 0)
/*
* Always consume at least one character of the input string
*/
start = match.value.Index + 1;
else
start = match.value.Index + match.value.Length;
if (match.value.Groups.Count == 1)
return Regexp.rb_reg_nth_match(0, match);
else
{
Array result = new Array();
for (int i = 1; i < match.value.Groups.Count; i++)
result = result.Add(Regexp.rb_reg_nth_match(i, match));
return result;
}
}
else
return null;
}
internal static String rb_str_subpat(String str, Regexp re, int nth, Frame caller)
{
if (re.rb_reg_search(str, 0, false, caller) >= 0)
{
return Regexp.rb_reg_nth_match(nth, Regexp.rb_backref_get(caller));
}
return null;
}