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lucene-queryparser

v3.0.0

Published

Lucene Query Parser for Javascript created using PEG.js

Downloads

1,347

Readme

Lucene Query Parser for JavaScript

This is an implementation of the Lucene Query Parser developed using PEG.js.

Example

A quick example of how to use it:

var parser = require('lucene-queryparser');

// return the expression tree
var results = parser.parse('title:"The Right Way" AND text:go');

console.log(results['left']['field']);      // title
console.log(results['left']['term']);       // The Right Way
console.log(results['operator']);           // AND
console.log(results['right']['field']);     // text
console.log(results['right']['term']);      // go

A slightly more complicated example:

var parser = require('lucene-queryparser');

// return the expression tree
var results = parser.parse('test AND (foo OR bar)');

console.log(results['left']['term']);       // test
console.log(results['operator']);           // AND

// the grouped expression in parentheses becomes it's own nested node
var rightNode = results['right'];

console.log(rightNode['left']['term']);     // foo
console.log(rightNode['operator']);         // OR
console.log(rightNode['right']['term']);    // bar

Installation

On the Command-Line

The library is available as an npm module.

To install, run:

npm install lucene-queryparser

Unit Tests

Unit tests are built with Jasmine.

On the Command-line

To run the unit tests on the command line, using node:

npm test

Grammar

The parser is auto-generated from a PEG implementation in Javascript called PEG.js.

To test the grammar without using the generated parser, or if you want to modify it, try out PEG.js online. This is a handy way to test an abritrary query and see what the results will be like or debug a problem with the parser for a given piece of data.