# RSQL Parser (C++) with SQL WHERE Generator

A simple C++ RSQL parser. It uses the visitor patter to allow using it for your custom needs.

This small example demonstrates:
- A lexer + parser for a subset of RSQL (supports `;` AND, `,` OR, parentheses).
- `=in=` and `=out=` list operators.
- An AST implementing `accept()` for the Visitor pattern.
- A `SQLBuilderVisitor` that generates an SQL `WHERE` clause.

Build:
```bash
mkdir build && cd build
cmake ..
cmake --build .
```

Run (example):
```bash
./rsql_parser "(status=in=(OPEN,CLOSED);priority==HIGH),category=out=(internal,test)"
```

The program prints the AST (evaluator) and the generated SQL WHERE clause.