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nearley

Simple, fast, powerful parser toolkit for JavaScript.

  • 2.20.1
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What is nearley?

The nearley npm package is a fast, feature-rich, and modern parser toolkit for JavaScript. It is based on Earley's algorithm and can be used to create parsers for complex, context-free grammars. nearley is designed to be simple to use and extend, making it a good choice for building compilers, interpreters, and other language-related tools.

What are nearley's main functionalities?

Grammar Definition

This feature allows you to define a grammar for your language. The grammar is written in a simple, JSON-like format and compiled into a parser.

{"module.exports = grammar({main: $ => ['hello', $.world],world: $ => 'world'});"}

Parsing Input

Once you have defined a grammar, you can create a parser and feed it input to parse. The parser will output a parse tree or a list of possible parse trees if the input is ambiguous.

{"const nearley = require('nearley');\nconst grammar = require('./your-grammar.js');\nconst parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar));\nparser.feed('hello world');\nconst results = parser.results;\nconsole.log(results);"}

Error Reporting

nearley provides error reporting features that help you understand where and why a parse failed, which is useful for debugging grammars and providing feedback to users.

{"const nearley = require('nearley');\nconst grammar = require('./your-grammar.js');\nconst parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar));\ntry {\n  parser.feed('hello wor');\n} catch (error) {\n  console.error(error.message);\n}"}

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Package last updated on 06 Dec 2020

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