/// <summary>
/// Returns a copy of the given string with text replaced using a regular expression.
/// </summary>
/// <param name="input"> The string on which to perform the search. </param>
/// <param name="replaceFunction"> A function that is called to produce the text to replace
/// for every successful match. </param>
/// <returns> A copy of the given string with text replaced using a regular expression. </returns>
internal string Replace(string input, FunctionInstance replaceFunction)
{
return(this.value.Replace(input, match =>
{
object[] parameters = new object[match.Groups.Count + 2];
for (int i = 0; i < match.Groups.Count; i++)
{
if (match.Groups[i].Success == false)
{
parameters[i] = Undefined.Value;
}
else
{
parameters[i] = match.Groups[i].Value;
}
}
parameters[match.Groups.Count] = match.Index;
parameters[match.Groups.Count + 1] = input;
return TypeConverter.ToString(replaceFunction.CallLateBound(null, parameters));
}, this.Global == true ? int.MaxValue : 1));
}
/// <summary>
/// Returns a copy of this string with text replaced using a replacement function.
/// </summary>
/// <param name="thisObj"> The string that is being operated on. </param>
/// <param name="substr"> The text to search for. </param>
/// <param name="replaceFunction"> A function that is called to produce the text to replace
/// for every successful match. </param>
/// <returns> A copy of this string with text replaced. </returns>
internal static string Replace(string thisObj, string substr, FunctionInstance replaceFunction)
{
// Find the first occurrance of substr.
int start = thisObj.IndexOf(substr, StringComparison.Ordinal);
if (start == -1)
{
return(thisObj);
}
int end = start + substr.Length;
// Get the replacement text from the provided function.
var replaceText = TypeConverter.ToString(replaceFunction.CallLateBound(null, substr, start, thisObj));
// Replace only the first match.
var result = new System.Text.StringBuilder(thisObj.Length + (replaceText.Length - substr.Length));
result.Append(thisObj, 0, start);
result.Append(replaceText);
result.Append(thisObj, end, thisObj.Length - end);
return(result.ToString());
}