/// <summary>
/// Either returns a weakly cached RegexReplacement helper or creates one and caches it.
/// </summary>
/// <returns></returns>
public static RegexReplacement GetOrCreate(WeakReference <RegexReplacement> replRef, string replacement, Dictionary <int, int> caps,
int capsize, Dictionary <string, int> capnames, RegexOptions roptions)
{
RegexReplacement repl;
if (!replRef.TryGetTarget(out repl) || !repl.Pattern.Equals(replacement))
{
repl = RegexParser.ParseReplacement(replacement, roptions, caps, capsize, capnames);
replRef.SetTarget(repl);
}
return(repl);
}
/// <summary>
/// Replaces all occurrences of the previously defined pattern with the
/// <paramref name="replacement"/> pattern, starting at the character position
/// <paramref name="startat"/>.
/// </summary>
public string Replace(string input, string replacement, int count, int startat, ref long replacements)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (replacement == null)
{
throw new ArgumentNullException(nameof(replacement));
}
// a little code to grab a cached parsed replacement object
RegexReplacement repl = (RegexReplacement)_replref.Get();
if (repl == null || !repl.Pattern.Equals(replacement))
{
repl = RegexParser.ParseReplacement(replacement, caps, capsize, capnames, roptions);
_replref.Cache(repl);
}
return(repl.Replace(this, input, count, startat, ref replacements));
}
/// <summary>
/// Returns the expansion of the passed replacement pattern. For
/// example, if the replacement pattern is ?$1$2?, Result returns the concatenation
/// of Group(1).ToString() and Group(2).ToString().
/// </summary>
public virtual string Result(string replacement)
{
RegexReplacement repl;
if (replacement == null)
{
throw new ArgumentNullException(nameof(replacement));
}
if (_regex == null)
{
throw new NotSupportedException(SR.NoResultOnFailed);
}
repl = (RegexReplacement)_regex._replref.Get();
if (repl == null || !repl.Pattern.Equals(replacement))
{
repl = RegexParser.ParseReplacement(replacement, _regex.caps, _regex.capsize, _regex.capnames, _regex.roptions);
_regex._replref.Cache(repl);
}
return(repl.Replacement(this));
}