/// <summary>
/// Substitue paramerters in source string with values provided by the <see cref="IParameterProvider"/>.
/// The followings are predefined parameters:
/// {=DateTime}: Current datetime value. Default format is "MMMM d, yyyy \"at\" HH:mm ET".
/// <see cref="IParameterProvider"/> can provide a custom format using the key "DateTimeFormat";
/// {=Newline}: New line character.
/// {=Tab}: Tab.
/// {=WhiteSpace}: White space.
/// {=DoubleQuote}: Double quote.
/// {SingleQuote}: Single quote.
/// </summary>
/// <param name="sSource">Source string with parameters defined in the format of {=paramertername}</param>
/// <param name="oParameterProvider">Paramerters value provider</param>
/// <returns>String with matched parameters replaced</returns>
public static string ParseParameterizedString(string source, IParameterProvider parameterProvider)
{
string dateTimeFormat;
string pre, post = String.Empty;
int begin = 0, end = 0;
StringBuilder strBuilder = new StringBuilder();
MatchCollection matches = Regex.Matches(source, TokenMapper.CodeBlock);
if (matches.Count <= 0)
{ return source; }
foreach (Match match in matches)
{
end = match.Index;
if (begin < source.Length)
{
pre = source.Substring(begin, end - begin);
begin = end + match.Length;
post = source.Substring(begin);
strBuilder.Append(pre);
}
try
{
switch (match.Result("$1").Trim())
{
case TokenMapper.DateTime:
dateTimeFormat = parameterProvider.GetProperty(DateTimeFormat);
if (dateTimeFormat != null && dateTimeFormat.Trim() != String.Empty)
try
{
strBuilder.Append(System.DateTime.Now.ToString(dateTimeFormat));
}
catch
{
throw new System.ArgumentException("DateTimeFormat is not valid.");
}
else
strBuilder.Append(System.DateTime.Now.ToString("MMMM d, yyyy \"at\" HH:mm ET"));
break;
case TokenMapper.Newline:
strBuilder.AppendLine();
break;
case TokenMapper.Tab:
strBuilder.Append("\t");
break;
case TokenMapper.WhiteSpace:
strBuilder.Append(" ");
break;
case TokenMapper.DoubleQuote:
strBuilder.Append("\"");
break;
case TokenMapper.SingleQuote:
strBuilder.Append("'");
break;
default:
strBuilder.Append(parameterProvider.GetProperty(match.Result("$1").Trim()));
break;
}
}
catch (Exception exception)
{
throw new Exception(string.Format("Failed to retrieve value for key {0}.", match.Result("$1").Trim()), exception);
}
}
strBuilder.Append(post);
return strBuilder.ToString();
}