/// <summary>
/// Creates an options entry wrapper for the specified property, iterating its internal
/// fields to create sub-options if needed (recursively).
/// </summary>
/// <param name="info">The property to wrap.</param>
/// <param name="spec">The option title and tool tip.</param>
/// <param name="depth">The current depth of iteration to avoid infinite loops.</param>
/// <returns>An options wrapper, or null if no inner properties are themselves options.</returns>
internal static CompositeOptionsEntry Create(IOptionSpec spec, PropertyInfo info,
int depth)
{
var type = info.PropertyType;
var composite = new CompositeOptionsEntry(info.Name, spec, type);
// Skip static properties if they exist
foreach (var prop in type.GetProperties(BindingFlags.Public | BindingFlags.
Instance))
{
var entry = TryCreateEntry(prop, depth + 1);
if (entry != null)
{
composite.AddField(prop, entry);
}
}
return(composite.ChildCount > 0 ? composite : null);
}
/// <summary>
/// Creates an options entry if an attribute is a valid IOptionSpec or
/// DynamicOptionAttribute.
/// </summary>
/// <param name="attribute">The attribute to parse.</param>
/// <param name="prop">The property to inspect.</param>
/// <param name="depth">The current depth of iteration to avoid infinite loops.</param>
/// <returns>The OptionsEntry created from the attribute, or null if none was.</returns>
private static IOptionsEntry TryCreateEntry(Attribute attribute, PropertyInfo prop,
int depth)
{
IOptionsEntry result = null;
if (prop == null)
{
throw new ArgumentNullException(nameof(prop));
}
if (attribute is IOptionSpec spec)
{
if (string.IsNullOrEmpty(spec.Title))
{
spec = HandleDefaults(spec, prop);
}
// Attempt to find a class that will represent it
var type = prop.PropertyType;
result = FindOptionClass(spec, prop);
// See if it has entries that can themselves be added, ignore
// value types and avoid infinite recursion
if (result == null && !type.IsValueType && depth < 16 && type !=
prop.DeclaringType)
{
result = CompositeOptionsEntry.Create(spec, prop, depth);
}
}
else if (attribute is DynamicOptionAttribute doa &&
typeof(IOptionsEntry).IsAssignableFrom(doa.Handler))
{
try {
result = Activator.CreateInstance(doa.Handler) as IOptionsEntry;
} catch (TargetInvocationException e) {
PUtil.LogError("Unable to create option handler for property " +
prop.Name + ":");
PUtil.LogException(e.GetBaseException() ?? e);
} catch (MissingMethodException) {
PUtil.LogWarning("Unable to create option handler for property " +
prop.Name + ", it must have a public default constructor");
}
}
return(result);
}
