/// <summary>
/// Generates a JSON Pointer from a lambda expression.
/// </summary>
/// <typeparam name="T">The type of the object.</typeparam>
/// <param name="expression">The lambda expression which gives the pointer path.</param>
/// <returns>The JSON Pointer.</returns>
/// <exception cref="NotSupportedException">
/// Thrown when the lambda expression contains a node that is not a property access or
/// <see cref="int"/>-valued indexer.
/// </exception>
public static JsonPointer Create <T>(Expression <Func <T, object> > expression)
{
var body = expression.Body;
var segments = new List <PointerSegment>();
while (body != null)
{
if (body.NodeType == ExpressionType.Convert && body is UnaryExpression unary)
{
body = unary.Operand;
}
if (body is MemberExpression me)
{
segments.Insert(0, PointerSegment.Create(me.Member.Name));
body = me.Expression;
}
else if (body is MethodCallExpression mce &&
mce.Method.Name.StartsWith("get_") &&
mce.Arguments.Count == 1 &&
mce.Arguments[0].Type == typeof(int))
{
segments.Insert(0, PointerSegment.Create(mce.Arguments[0].ToString()));
body = mce.Object;
}
