private void PerformVariableReplacement(StringBuilder builder, string text)
{
var start = 0;
var length = text.Length;
while (start < length)
{
var match = VariableRegex.Match(text, start);
if (!match.Success)
{
builder.Append(text, start, length - start);
return;
}
builder.Append(text, start, match.Index);
builder.Append(GetVariableReplacement(match));
start = match.Index + match.Length;
}
}
/// <summary>
/// Replaces the variable names with repective values in the supplied string.
/// </summary>
/// <param name="input">The string which to have the evaluation applied.</param>
/// <param name="hostVariables">The collection of variables to be queried.</param>
/// <returns>String</returns>
public static string EvaluateVariable(string input, Dictionary <string, string> hostVariables)
{
if (hostVariables != null && !string.IsNullOrWhiteSpace(input))
{
var match = VariableRegex.Match(input);
if (match.Success)
{
do
{
var key = match.Groups[1].Value;
if (hostVariables.ContainsKey(key))
{
input = input.Replace(match.Value, hostVariables[key]);
}
} while ((match = match.NextMatch()).Success);
}
}
return(input);
}