lucene-queryparser
v3.0.0
Published
Lucene Query Parser for Javascript created using PEG.js
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1,347
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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.