Functions abstract syntax trees hide functions existence.
Added functions to S007BooleanWithFunctions grammar.
Simple boolean expression language with a reasonable tree.
Added first version of simple boolean expression grammar.
Error handling methods demonstated on a 'Hello word' grammar.
Hello word grammar able to parse a single 'Hello word!' expression.
It has no error handling. Includes test case.
ANTLR is configured and ready to be used. Otherwise an empty project.