PLC-lang/rusty

`__ISVALIDREF` helper function

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#1,254 opened on Jul 2, 2024

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codesysgood first issuemedium-priority

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Description

Is your feature request related to a problem? Please describe. https://github.com/PLC-lang/rusty/pull/1251 introduced the REF= and REFERENCE TO (extension) keywords. According to CodeSys the __ISVALIDREF function is also part of that extension however and currently missing.

Describe the solution you'd like Implement the given function either as part of the stdlib or as a builtin (probably the latter though)

Contributor guide

Research direction
Study the existing reference handling in the codebase (e.g., PR #1251) to understand how REF= and REFERENCE TO are implemented. Then implement ISVALIDREF as a builtin function, following patterns from similar builtin functions like ISVALID.
Tech stack
rust
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rustcompiler basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50