lark-parser/lark

testing/debugging grammar interactively ?

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#149 opened on May 22, 2018

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Description

I am thinking something along the lines of https://omrelli.ug/nearley-playground/ that provides an interactive feedback to the user creating a grammar, via examples or other way. The nicest tool I know is about regular expressions only : https://regex101.com/

Is there something like that for parser grammars ? where we could just add lark syntax?

I am not used to write parser grammars, and I am currently doing this in a python interpreter. The raw python error messages can be quite cryptic for a newcomer. Any idea ? Am I missing an obvious tool here ?

Contributor guide

Research direction
Search for existing Lark playgrounds or interactive tools; consider building a simple web based playground using Lark's API and a Python backend (e.g., Flask) with a frontend (e.g., HTML/JS) to test grammars interactively. Alternatively, improve documentation with examples and error message explanations.
Tech stack
python
Domain
developer experiencetooling
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.
Mostly clear
Prerequisites
PythonLark basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70