Unexpected error with # and ternary operator

[DonStauffer]

I've found that to get the size of an array which is element of an array, I have to parenthesize the array expression. That's no problem, and this displays "C=2" as expected:

var A = {{1,2}, {3,4}}
;var B = 0
var C = (exists(var.B) ? var.B : #(var.A[0]))
echo "C="^var.C

However, remove the semicolon so that B is defined, and it seems like you should see "C=0", but instead you get:

Error: in file macro line 3 column 45: meta command: expected object model value or string after '#

(Incidentally missing the closing apostrophe; also, it seems like it should say "expected object model value, string, or array expression after '#'".)

Parenthesizing the # expression doesn't help. It seems to be a parsing error. Possibly failing to recognize the : as part of the ternary operator under some circumstances.

[DonStauffer]

@DonStauffer Obvious workaround :

var A = {{1,2}, {3,4}}
var B = 0
var D = #(var.A[0])
var C = exists(var.B) ? var.B : var.D)

echo "C="^var.C

[dc42]

@DonStauffer which firmware version are you using, and are you using standalone mode or attached SBC? I just tested this, which is the same as your example with the brackets after # removed and it works for me:

var A = {{1,2}, {3,4}}
;var B = 0
var C = (exists(var.B) ? var.B : #var.A[0])
echo "C="^var.C

If I remove the semicolon from the second line then it also works. I am running 3.6.0-alpha.1 in standalone mode. The expression parsing code has not changed since 3.5.2. Maybe you are running in SBC mode?

[dc42]

@DonStauffer I have now reproduced this and created https://github.com/Duet3D/RepRapFirmware/issues/1020 and https://github.com/Duet3D/RepRapFirmware/issues/1021.

dc42 created this issue in Duet3D/RepRapFirmware

closed Incorrect processing of # operator when operand is an element of an array of arrays #1020

dc42 created this issue in Duet3D/RepRapFirmware

closed Parsing error when using ternary operator #1021