lex-parser

library0.1.4jsnpmunverified

A parser for lexical grammars used by jison and jison-lex. Currently at version 0.1.4, it parses lexical grammar definitions (similar to those used by Lex/Yacc) and returns a JSON representation. It is a low-level dependency for jison tools and not commonly used directly. The package appears to be stable but rarely updated, with the last release likely years ago. Unlike higher-level alternatives like jison itself, lex-parser focuses solely on parsing the grammar syntax.

serialization

npm install lex-parser

package ↗

INSTALL

IMPORT

SIG · LEX-PARSER

lex-parser

serializationjavascriptv0.1.4

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default (parse function)

✓ import lexParser from 'lex-parser'; const result = lexParser.parse('%%...');

✗ const lexParser = require('lex-parser'); // Works for CJS but not ESM

Package exposes a single parse function as default export. In CommonJS environments, require is acceptable; for ESM, use import.

parse function (named)

✓ import { parse } from 'lex-parser'; const result = parse('%%...');

✗ import { lexParser } from 'lex-parser'; // Wrong symbol; named export is 'parse', not 'lexParser'.

The named export 'parse' is available. Avoid confusing with the package name.

Shows how to install, import, and use lexParser.parse() to parse a simple lexical grammar and output JSON.

import lexParser from 'lex-parser'; const grammar = ` NAME [a-zA-Z_][a-zA-Z0-9_-]* %% {NAME} return 'NAME'; `; const parsed = lexParser.parse(grammar); console.log(JSON.stringify(parsed, null, 2));

Debug

Known issues

gotchaPackage uses CommonJS module format by default; ESM may require additional configuration.

fix

Use dynamic import or configure bundler for CommonJS compatibility.

affects: >=0.0.1

deprecatedPackage is rarely updated; consider using jison-lex directly for grammar parsing inside jison workflows.

fix

Instead of using lex-parser directly, rely on jison or jison-lex which include it as a dependency.

affects: >=0.0.1

gotchaThe parse function expects a complete grammar string with '%%' separator between rules and code; missing it results in invalid output.

fix

Ensure grammar string includes '%%' to separate the rules section from optional trailing code.

affects: >=0.0.1

Errors

Common errors & fixes

lexParser.parse is not a function

Incorrect import: using import or require improperly. For example, importing as default but using .parse as if it were a method on an object.

fix

Use either: const result = lexParser.parse('%%...'); if lexParser is the default import (CommonJS), or const { parse } = require('lex-parser'); result = parse('%%...');

Cannot find module 'lex-parser'

Package not installed.

fix

Install via npm: npm install lex-parser

Upgrade

Version history

0.1.4latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

packagehttps://www.npmjs.com/package/lex-parser ↗