Deadline: 5.30pm, Thursday 25 September 2003.
Download and unpack the interpreter archive for this course, and make sure you can compile and run the interpreter.
cd interpreter javac hobbes/test/Main.java java hobbes.test.Main tests/Test*.hob java hobbes.test.Main tests/Fail*.hob
When you run the interpreter, you will get messages saying "Tests failed". Your homework is to get rid of these messages!
This week, the problem is that the abstract syntax tree for
Hobbes is not complete. It is missing two classes:
(both in file
You should complete these two classes.
Hint: remember that the Hobbes AST is immutable
so once an AST node is created, it never changes! In particular,
you may want to use the
class of immutable dictionaries.
You should add comments to the code, indicating which edits you made, for example:
// Edited by Wilma Flintstone: print ("hello"); // End of edits.
Once you have a working edited version of
create a zip archive containing that file, plus any other files
you edited, and submit it using Courses On Line.