topic Conditional branching (again) - use of IFS in GDL

Conditional branching (again) - use of IFS

Jim Allen — Thu, 26 Sep 2024 11:44:42 GMT

I really struggle with multiple conditions in GDL.

The IFS command seems to be the simplest and does what I want but the AC27 GDL editor doesn't like it.

I'm building a parametric manhole object, and need to set the size based on the depth and number of branches.

The parameters are these:

If there are more than 3 branches in the manhole (from the user inputs) - set the manhole length to 1370
If the manhole depth is greater than 900 (and there are fewer than 3 branches) - set the manhole length to 1250
If there are exactly 3 branches in the manhole (and the depth is greater than 900)- set the manhole length to 1030
Otherwise (if depth is less than 900 and there are fewer than 3 branches) - set the manhole length to 800

This would seem to do what I want according to the user guide (https://helpcenter.graphisoft.com/user-guide/88992/)

IFS (numbranches>3, mhlength=1370, ZZYZX>900, mhlength=1250,numbranches=3,mhlength=1030,TRUE,mhlength=800)

Yet I get this error when it is checked:

Missing CALL keyword (not recommended)

at line 56 in the Master script of file BG_Manhole_Rect_v0.1.gsm

Obviously I'm doing something wrong, I'm just not sure what. Any ideas?

Re: Conditional branching (again) - use of IFS

runxel — Tue, 28 Nov 2023 15:56:26 GMT

Hey Jim, you're conflating GDL with Expressions here. So no wonder it does not work. What do you actually want to do?

GDL does not support IFS.

Re: Conditional branching (again) - use of IFS

A_ Smith — Tue, 28 Nov 2023 15:56:47 GMT

scroll to IF

Re: Conditional branching (again) - use of IFS

Jim Allen — Tue, 28 Nov 2023 16:06:33 GMT

Thanks!

Thanks makes sense - pity...

It's all documented in the original post - I think.

I'm going to have to turn that into horrible nested statements. I hate the GDL implementation of conditional branching ...grr...

On a more positive note, I'm going to use your LocatorLX script as a template for the 2D labels, most of the scripting is done, so that will save a lot of time.

I should then have some nice parametric manhole objects I can drop into a model use as connection points for drain runs, and schedule.