private static string _parenthesize(BplPermissions permissions) {
if (!permissions.IsAtomic) {
return "(" + permissions + ")";
}
return permissions.ToString();
}
/// <summary>Parses the specified permissions pattern and combines with the given base permissions.</summary>
public static BplPermissions Parse(BplPermissions basePermissions, string pattern) {
if (pattern.IsEmpty()) {
return basePermissions;
} else {
pattern = pattern.Trim();
if (pattern.StartsWith("+")) {
return basePermissions + _parse(pattern.After(0));
} else if (pattern.StartsWith("-")) {
return basePermissions - _parse(pattern.After(0));
} else {
return _parse(pattern);
}
}
}
