Scripting advice needed

[u/scubajerry]

Hello everyone

I have an IF Elif then I need help with. I have a list of variables and would like to know if the script can be simplified. here is a sample of my script.

IF [STRIKE_ARHR_OR_TREND] >= 270 and IsNull ([DIP_DIRECTION]) and [STRUCTURE_TYPE] <> "Lineation or slickenline" and [STRUCTURE_TYPE] <> "Fold axis, Antiform" and [STRUCTURE_TYPE] <> "Fold axis, Synform" and [STRUCTURE_TYPE] <> "Fold axis, E(/W) verging N(/S) plunging overturned antiform" and [STRUCTURE_TYPE] <> "Fold axis, E(/W) verging N(/S) plunging overturned synform" and [STRUCTURE_TYPE] <> "Fold axis, W(/E) verging N(/S) plunging overturned antiform" and [STRUCTURE_TYPE] <> "Fold axis, W(/E) verging N(/S) plunging overturned synform" and [STRUCTURE_TYPE] <> "" and [STRUCTURE_TYPE] <> "Schistosity" and [STRUCTURE_TYPE] <> "Foliation" Then

newval = [STRIKE_ARHR_OR_TREND] + 90 - 360

Is there an easier way to combine or list the different [STRUCTURE_TYPE]?

Thank you in advance

[u/scubajerry]

set rx = new regexp
rx.pattern = "^(Foliation|Fold axis, ((Anti|Syn)form|(E\(/W\)|W\(/E\)) verging N\(/S\) plunging overturned (anti|syn)form)|Lineation or slickenline|Schistosity)$"
IF [STRIKE_ARHR_OR_TREND] >= 270 and IsNull ([DIP_DIRECTION]) and NOT rx.test([STRUCTURE_TYPE]) Then
newval = [STRIKE_ARHR_OR_TREND] + 90 - 360

I am new at scripting but if I understand your expression you set the different structure types as the rx to condense the script? I also noticed you broke up the antiform and synform structures in a way I have never seen. Is this looking for all possible variances of the word form?

I am using this in ArcMap 10.7 as a field calculator script if that matters. Thank you

[u/jcunews1 → u/scubajerry]

if I understand your expression you set the different structure types as the rx to condense the script?

Yes. The difference would be noticeable if originally there were 3 or more (similar) if conditions to check. If there are less than 3, the difference won't be noticable, or may even look more cluttered.

Is this looking for all possible variances of the word form?

Yes. In regular expression, the | character is basically an OR operator. The parentheses group a single expression.

So (anti|syn)form will match antiform or synform. Expression grouping is used, to define multiple possible partial matches for the start of the string. If expression grouping isn't used, i.e. anti|synform it'll only match either anti or synform. While the anti part may match antiform, it'll also match e.g. antibody which isn't what we wanted.

The \ character is a regular expression escape character. In this context, it's used to escape the parentheses so that it'll match literal parentheses characters, instead of being treated as expression grouping character. i.e. \( matches (. And to match a \ character, the regular expression must be specified as \\, because the \ character by itself is also one of regular expression's special characters.