lark-parser/lark

testing/debugging grammar interactively ?

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#149 建立於 2018年5月22日

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 (12 留言) (0 反應) (0 負責人)Python (4,275 star) (384 fork)batch import
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描述

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 ?

貢獻者指南

技術棧
python
領域
developer experiencetooling
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
over 1 week
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
needs investigation
前置要求
basic knowledge of Lark grammarunderstanding of parsing concepts
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
20
研究方向
The issue requests an interactive grammar debugging tool similar to regex101.com. To implement, one could explore using Lark's Python API to parse example inputs and display errors visually. A web interface could be built using Flask or a simple JavaScript frontend. Key challenges include providing meaningful error messages and real time feedback. Consider referencing existing Lark playground projects or building a new one with a split pane layout showing grammar, input, and parse tree/output.