/// <summary>
/// Gets the value of the specified alias from the alias table.
/// </summary>
///
/// <param name="aliasName">
/// The name of the alias value to retrieve.
/// </param>
///
/// <param name="scopeID">
/// A scope identifier that is either one of the "special" scopes like
/// "global", "script", "local", or "private, or a numeric ID of a relative scope
/// to the current scope.
/// </param>
///
/// <returns>
/// The AliasInfo representing the alias.
/// </returns>
///
/// <exception cref="ArgumentException">
/// If <paramref name="scopeID"/> is less than zero, or not
/// a number and not "script", "global", "local", or "private"
/// </exception>
///
/// <exception cref="ArgumentOutOfRangeException">
/// If <paramref name="scopeID"/> is less than zero or greater than the number of currently
/// active scopes.
/// </exception>
///
internal AliasInfo GetAliasAtScope(string aliasName, string scopeID)
{
AliasInfo result = null;
if (String.IsNullOrEmpty(aliasName))
{
return(null);
}
SessionStateScope scope = GetScopeByID(scopeID);
result = scope.GetAlias(aliasName);
// Make sure the alias isn't private or if it is that the current
// scope is the same scope the alias was retrieved from.
if (result != null &&
(result.Options & ScopedItemOptions.Private) != 0 &&
scope != _currentScope)
{
result = null;
}
return(result);
} // GetAliasAtScope
/// <summary>
/// Derived classes override this method to return their
/// particular type of scoped item.
/// </summary>
/// <param name="scope">
/// The scope to look the item up in.
/// </param>
/// <param name="name">
/// The name of the item to retrieve.
/// </param>
/// <param name="alias">
/// The scope item that the derived class should return.
/// </param>
/// <returns>
/// True if the scope item was found or false otherwise.
/// </returns>
protected override bool GetScopeItem(
SessionStateScope scope,
VariablePath name,
out AliasInfo alias)
{
Diagnostics.Assert(!(name is FunctionLookupPath),
"name was scanned incorrect if we get here and it is a FunctionLookupPath");
bool result = true;
alias = scope.GetAlias(name.QualifiedName);
// If the alias is private and the lookup scope
// isn't the current scope, claim that the alias
// doesn't exist so that the lookup continues.
if (alias == null ||
((alias.Options & ScopedItemOptions.Private) != 0 &&
scope != sessionState.CurrentScope))
{
result = false;
}
return(result);
}
protected override bool GetScopeItem(SessionStateScope scope, VariablePath name, out AliasInfo alias)
{
bool flag = true;
alias = scope.GetAlias(name.QualifiedName);
return(((alias != null) && (((alias.Options & ScopedItemOptions.Private) == ScopedItemOptions.None) || (scope == base.sessionState.CurrentScope))) && flag);
}