This is my tutor's project, The original author is Dr David J. Pearce. I have performed several extensions to this projects.

1. Add the support of Do-While loop for WHILE language .
2. Add the support of Macros.
3. Add the support of TypeChecking, such as Null type, Union type and subtyping.
4. Add the support of Type Casting.
5. Refined Bytecode generator.
6. Refined Machine Code generator.