length: Returns the length of the given string/list/map

[chucker]

Only for strings so far.

I'm not sure how to create maps and lists; perhaps by parsing a piece of code?

• support strings
• support maps
• support lists
  - [ ] properly implement trimming (IL2026, IL2072) see trimmable reflection #28

[ricardoboss]

I like the automatic registration of native functions. I wouldn't classify it as IO, though. Either move it to "Conversion" (since it returns a different type) or create a new one.

if (exp is not ConstantExpression conExp)

will throw for everything but constants directly passed to the function. After getting the single expression, you need to evaluate it using the interpreter. Afterwards, you can work with the ExpressionResult.

[chucker]

I wouldn't classify it as IO, though.

I originally had a new group (String?), but the polymorphic nature makes it hard to classify.

[ricardoboss]

What about Conversion as per the proposed categories for all new functions?

[chucker]

dotnet/sdk#27997 (comment)

I'm not sure this rabbit hole is worth it.

[chucker]

The automatic registration is now part of #28. We either fix trimming, or remove that requirement; either way, it isn't really directly related to this PR.

[chucker]

What about Conversion as per the proposed categories for all new functions?

I don't love it, but IO isn't great either. Done.

[ricardoboss]

@chucker I added a section about how the new functions should be documented. Please add some documentation for the length function at StepLang.Wiki/Functions/Length.md with the sections "Description", "Syntax"/"Synopsis", "Remarks" and "Examples".

For reference, you can look at the substring function documentation at https://github.com/ricardoboss/STEP/blob/main/StepLang.Wiki/Functions/Substring.md