Question 1

How to handle left recursion in nearley?

Accepted Answer

nearley handles left recursion automatically using the Earley algorithm, so you can define grammars with left recursion directly without workarounds. This is a key advantage over parsers like PEGjs that choke on such grammars.

Question 2

nearley vs Jison: which is better for JavaScript parsing?

Accepted Answer

nearley excels with complex or ambiguous grammars, including left recursion, while Jison is based on Bison and may struggle with these. However, Jison might be faster for simple, deterministic grammars due to its LR-based approach.

Question 3

Can nearley parse JSON efficiently?

Accepted Answer

Yes, nearley can parse JSON by defining a grammar, but for production use, built-in JSON parsers in JavaScript are faster and more optimized. nearley is better suited for custom or complex formats.

Question 4

How to integrate moo lexer with nearley?

Accepted Answer

First, install both nearley and moo via npm. Then, define your grammar in nearley and use moo to tokenize input before parsing. The nearley documentation provides examples for seamless integration.

Question 5

Is nearley suitable for browser-based parsing?

Accepted Answer

Yes, nearley works in both Node.js and browser environments, as stated in the README. It's lightweight and can be bundled for web applications, but consider performance for large inputs.

Question 6

What are the performance benchmarks for nearley?

Accepted Answer

nearley's performance varies by grammar complexity; the Earley algorithm ensures correctness but can be slower for unambiguous grammars compared to LL/LR parsers. Benchmark with your specific use case for accurate metrics.

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