Set up and Installation.

To use the antlr framework we need the ANTLR code generation tool itself and a runtime library for python.

Installation steps

1. The code generation part of ANTLR requires java. Install java on your machine.
2. Install the ANTLR runtime for python3.You can use the command python3 -m pip install antlr4-python3-runtime. More instructions are available at https://github.com/antlr/antlr4/blob/master/doc/python-target.md.
3. Install the other required python packages for visualizing the CFG. Use apt-get install libgraphviz-dev to install graphviz and then use the command python3 -m pip install networkx pygraphviz to install the python packages required.
4. Run the./build.sh script to generate the parser/lexer code.

This is the first time we are using this code base. Thank you for your patience while we figure out all the problems in the code.