This is a python3 syntax checker for 3.11.4 implemented using ANTLR4 with Python. It was created as part of a class project. The idea is that it mainly checks that data structures are correct when doing operations in the file.

It covers

• For loop declarations
• While Loop declarations
• If statement, elif statements, else statement.
• Operations +,-,/,%,//,*,** with support for parenthesis between data types and checks what is valid. All expressions are left-recursive except for ** which is right recursive.
• The program is run through main.py
• There is a MyExprVisitor.py class that implements the labels from the Expr.g4(ANTLR4 file) which declares the grammar.

Note:

• There are a few invalid multiplications like "hello"5 is allowed and 5"hello" is allowed.
• Multiple elif statements are not perfectly done.
• Sometimes it says unexpected EOF(end of file) but then says the program is built correctly.

Future Work:

• Fix elif statements
• Multi-line comments
• Decorators
• EOF file issues.