lark-parser/lark

testing/debugging grammar interactively ?

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#149 创建于 2018年5月22日

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 (12 评论) (0 反应) (0 负责人)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 ?

贡献者指南

技术栈
python
领域
developer experiencetooling
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
4
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
over 1 week
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
needs investigation
前置要求
basic knowledge of Lark grammarunderstanding of parsing concepts
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.