Open Source Haskell Parser Generators

More Than Parsing is a parser generator for context free grammars defined in a BNF-like format. It generates scanners, parsers, ASTs, etc. This sf project is no longer active, development will continue in a different place.

Queryparser is Uber’s open source Haskell library for parsing and analyzing SQL queries written in different dialects (Vertica, Hive, Presto). It creates a unified AST and supports name resolution using catalog metadata, enabling large-scale query analysis for lineage detection, analytics, and tooling. The parsing logic produces an AST with table and column identifiers that are "raw" or optionally qualified. Frequently, it is desirable to convert the AST over raw names to an AST over resolved names, where identifiers are fully qualified. This transformation is called "name resolution" or simply "resolution". It requires as input the full list of columns in every table and the full list of tables in every schema, otherwise known as "catalog information". The parsing logic produces an AST with table and column identifiers that are "raw" or optionally qualified.