npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@atlassianlabs/jql-parser

v1.0.1

Published

JQL lexer, parser, listener and visitor

Downloads

15,384

Readme

JQL Parser

Atlassian license

This library contains auto-generated sources from the antlr4ts library using the JQL ANTLR4 grammar. It enables consumers to parse a JQL query into a parse tree.

Usage

import { CharStreams, CommonTokenStream } from 'antlr4ts';
import { JQLLexer, JQLParser } from '@atlassianlabs/jql-parser';

// Create the lexer and parser
const jqlText = "project = JQL";
const charStream = CharStreams.fromString(jqlText);
const lexer = new JQLLexer(charStream);
const tokenStream = new CommonTokenStream(lexer);
const parser = new JQLParser(tokenStream);

// Parse the input, where `jqlQuery` is the entry point
const parsedJQLTree = parser.jqlQuery();

Installation

yarn add @atlassianlabs/jql-parser

Documentation

Inspecting the parse tree

A JQL parse tree can be inspected using the JQLParserListener or JQLParserVisitor, you can read about the differences between the visitor/listener approaches here.

Listener Approach

import { JQLParserListener, JqlQueryContext } from '@atlassianlabs/jql-parser';
import { ParseTreeWalker } from 'antlr4ts/tree/ParseTreeWalker';


class EnterQueryListener implements JQLParserListener {
    enterJqlQuery: (context: JqlQueryContext) {
        console.log(`Query start line number ${context._start.line}`);
        // ...
    }

    // other enterX functions...
}

// Create the listener
const listener: JQLParserListener = new EnterQueryListener();
// Use the entry point for listeners on the parsed JQL tree
ParseTreeWalker.DEFAULT.walk(listener, parsedJQLTree);

Visitor Approach

import { JQLParserVisitor, JqlOperandContext } from '@atlassianlabs/jql-parser';
import { AbstractParseTreeVisitor } from 'antlr4ts/tree/AbstractParseTreeVisitor';

// Extend the AbstractParseTreeVisitor to get default visitor behaviour
class CountOperandsVisitor extends AbstractParseTreeVisitor<number>
  implements JQLParserVisitor<number> {
  defaultResult() {
    return 0;
  }

  aggregateResult(aggregate: number, nextResult: number) {
    return aggregate + nextResult;
  }

  visitJqlOperand(context: JqlOperandContext): number {
    return 1 + super.visitChildren(context);
  }
}

// Create the visitor
const countOperandsVisitor = new CountOperandsVisitor()
// Use the visitor entry point with the parsed JQL tree
const numberOfOperands = countOperandsVisitor.visit(parsedJQLTree);

Support

For developers outside of Atlassian looking for help, or to report issues, please make a post on the community forum. We will monitor the forums and redirect topics to the appropriate maintainers.

License

Copyright (c) 2021 - 2022 Atlassian and others. Apache 2.0 licensed, see LICENSE file.