Picolab/pico-engine

Need a better parser/compile error message for mis-placed bindings/assignments

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#595 opened on Mar 30, 2022

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help wanted

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Description

KRL doesn't allow name/value bindings except in a prelude or in a function definition. When these are tried in other places, the error messages are unclear/misleading and sometimes don't fail until JavaScript compilation. Need specific examples. But, see also, issue #528, which makes a case for such bindings in an every action block.

KRL doesn't allow entity variable assignments anywhere but in a postlude. When one is attempted in a defaction the error message seen is "ParseError: Expected '('" which is not helpful.

Contributor guide

Research direction
Investigate the KRL parser and compiler code to identify where misplaced bindings fail, and design clear error messages that indicate the allowed locations for bindings.
Tech stack
typescript
Domain
backend
Issue type
Bug
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.
Needs investigation
Prerequisites
KRL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40