[FeatureRequest]: Add a means to check the type of a variable

[dc42]

Is your feature request related to a problem? Please describe.

It would be good to be able to validate the parameters to a macro file at its start. See https://forum.duet3d.com/topic/32467/q-how-to-check-the-type-of-a-variable.

Describe the solution you propose.

[DC] Some possibilities:

1. Introduce a "typeof" operator along with type names. Then we could use expressions such as:

if typeof(param.D) = typeof(int)

2. To avoid introducing type names, introduce a separate operator for most types, e.g.:

if isInteger(param.D)]

We wouldn't need a isString function because any parameter can be converted to a string, but we would need functions to test most or all other types.

3. Introduce a typeof operator as in Added new "I" parameter to M106 #1 but also introduce named constants for each type, e.g.:

if typeof(param.D) = typeInt

4. Similar to Added new "I" parameter to M106 #1 or FTP and partial Telnet support #3 but allow conversions, e.g.:

if canConvert(param.D, typeInt)

This approach may be more useful because it will avoid the need to test for int and float separately.