gridl/pg_sql_parser

PostgreSQL SQL and PL/pgSQL parser

pg_sql_parser

The aim of this project is to provide a PostgreSQL SQL and PL/pgSQL grammars (ANTLR4) to enable code analysis of Postgres stored procedures in Java and Python.

This is work in progress or even an experiment for now.

METHOD

We create grammar files for a lexer and a parser. ANTLR4 can turn these into java classes for us. We can then use these classes to parse the source code. Having a basic grasp of parsing and ANTLR4 is very valuable in getting started.

GOALS

For this project we have a few different goals, they are here listed in order of ease of expected implementation:

• Identify relations that are being mentioned (and therefore probably used) in the stored procedures.
• Reformat source code

REFERENCES

We are not the only one having this idea. There are multiple projects dead and alive which are attempting the same thing. We will list a few as reference, to learn from other's mistakes and ideas.

An ANTLR 4 lexer for PostgreSQL
https://github.com/tunnelvisionlabs/antlr4-grammar-postgresql
Last activity: 4 days ago (September 2014)

pg-parser
https://github.com/claesjac/pg-parser
Last activity: 3 years ago (2011)

Discussion: exporting raw parser
http://postgresql.1045698.n5.nabble.com/exporting-raw-parser-td2018442.html
Last activity: 4 years ago (2010)

pgFormatter
https://github.com/darold/pgFormatter
Last activity: 14 days ago (September 2014)

BUGS

Issue 670

• ANTLR 4.2.2 Can parse our .g4 files, but cannot generate Python code.
• ANTLR 4.4 Cannot parse our .g4 files, but can generate Pyton code.
  antlr/antlr4#670