///<summary>Set variables specified in the sv parameter, execute a certain action, then restore the set variables back.</summary>
///<param name="method">Delegate to execute</param>
///<param name="sv">Variables to set/restore before/after execution</param>
///<param name="prefix">Add a given prefix to the variable names.</param>
///<returns></returns>
public object ExecuteWithVars(ScriptExecuteMethod method, Vars sv, string prefix)
{
var save = new Dictionary <string, object>();
var delete = new List <string>();
try
{
foreach (var v in sv)
{
string vn = prefix + v.Name;
object o = GetOrDefault(vn, null);
if (o == null && !IsSet(vn))
{
delete.Add(v.Name);
}
else
{
save[v.Name] = o;
}
this[vn] = v.Value;
}
return(method());
}
finally
{
foreach (var savePair in save)
{
string vn = prefix + savePair.Key;
if (IsSet(vn))
{
sv[savePair.Key] = Get(vn);
}
else
{
sv.Remove(savePair.Key);
}
this[vn] = savePair.Value;
}
foreach (var d in delete)
{
string vn = prefix + d;
if (IsSet(vn))
{
sv[d] = Get(vn);
}
else
{
sv.Remove(d);
}
Remove(vn);
}
}
}
private void setCaptureVars(Regex regex, Match match, Vars variables)
{
string pref = Context.TransformStr(Name, Transform);
for (int j = 0; j < match.Groups.Count; ++j)
{
Group g = match.Groups[j];
string name = regex.GroupNameFromNumber(j);
if (name.Length > 0 && char.IsDigit(name[0]))
{
name = "_" + name;
}
if (!string.IsNullOrEmpty(pref))
{
name = pref + name;
}
if (g.Success)
{
variables[name] = g.Value;
}
else
{
variables.Remove(name);
}
}
}