/// <summary>
/// Evaluate the funcall.
/// </summary>
/// <param name="sub">Instance of substitution.</param>
/// <param name="subContainer">Substitution service.</param>
/// <returns>Result of substitution.</returns>
public static string Eval(Substitution sub, SubstitutionService subContainer)
{
if (!sub.IsValid)
{
return(sub.FuncName);
}
return(subContainer._groups[sub.Groupname][sub.FuncName](sub.FuncName));
}
/// <summary>
/// parse the substitution.
/// </summary>
/// <param name="funcCall">Substitution function.</param>
/// <param name="subContainer">Substitution service.</param>
/// <returns>Result of substitution.</returns>
public static Substitution Parse(string funcCall, SubstitutionService subContainer)
{
Match match = Regex.Match(funcCall, @"\$\{(?<name>[\S]+)\}");
if (match == null || !match.Success)
{
return(new Substitution(string.Empty, funcCall, false, null));
}
string name = match.Groups["name"].Value;
int ndxDot = name.IndexOf(".");
// No "." in func name.
// e.g. Such as ${today} instead of ${datetime.today}.
if (ndxDot < 0)
{
if (!subContainer._groups[""].ContainsKey(name))
{
return(new Substitution(string.Empty, name, false, null));
}
return(new Substitution(string.Empty, name, true, null));
}
// Get the group name.
string groupName = name.Substring(0, ndxDot);
string funcName = name.Substring(ndxDot + 1);
// Does the func call exist ?
if (!subContainer._groups.ContainsKey(groupName) || !subContainer._groups[groupName].ContainsKey(funcName))
{
return(new Substitution(string.Empty, funcCall, false, null));
}
// Not handling args for the time being.
return(new Substitution(groupName, funcName, true, null));
}
static Substitutor()
{
_provider = new SubstitutionService();
}