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:

mkdir build && cd build
cmake ..
cmake --build .

Run (example):

./rsql_parser "(status=in=(OPEN,CLOSED);priority==HIGH),category=out=(internal,test)"

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