Howdy.

This repo just popped up on my radar.

I'm doing something similar with kevinswiber/calypso.

You can find all the query language parsing code here: https://github.com/kevinswiber/calypso/tree/master/compiling

I'm using Jison to generate a SQL parser. It doesn't fully conform to any SQL standard, but it's a start.

The goal of Calypso is to provide a common query language that can be implemented on top of any queryable data source. I have drivers for MongoDB and a Backend-as-a-Service called Usergrid. Calypso was born out of another project. I still need to port over older CouchDB and Salesforce drivers.

It also has a data mapper associated with it for automatically hydrating query results into object models.

The source code is released under the MIT license (my employer, Apigee, holds the copyright).

Here's a usage example: https://gist.github.com/kevinswiber/44542186e5dbc5bd03c6

Anyway, the point is... there might be some code you can steal from Calypso to serve your interests. If so, have at it!

Cheers!