/// <summary>
/// Tries to retrieve the value from the given path. The path is a dot separated string of property names.
/// </summary>
/// <typeparam name="T">The expected type of the value.</typeparam>
/// <param name="instance">The root instance to start the lookup from.</param>
/// <param name="path">A dot separated string of property names. Spreaded properties can be indexed using [N] for example "MySpread[0]" retrieves the first value in MySpread.</param>
/// <param name="defaultValue">The default value to use in case the lookup failed.</param>
/// <param name="value">The returned value.</param>
/// <returns>True if the lookup succeeded.</returns>
public static bool TryGetValueByPath <T>(this IVLObject instance, string path, T defaultValue, out T value)
{
var spine = instance.GetSpine(path);
var entry = spine.Pop();
var leaf = entry.Value;
return(TryGetValueByExpression(leaf, entry.Key, defaultValue, out value));
}
static IVLObject WithValueByPath <T>(this IVLObject instance, string path, T value)
{
var spine = instance.GetSpine(path);
// Update the leaf with the value
var entry = spine.Pop();
var leaf = entry.Value;
var updatedInstance = leaf.WithValueFromExpression(entry.Key, value);
// Update the VL objects along the spine
while (spine.Count > 0)
{
entry = spine.Pop();
updatedInstance = entry.Value.WithValueFromExpression(entry.Key, updatedInstance);
}
return(updatedInstance);
}
